Add logger

43 files changed, 12056 insertions, 11 deletions

diff --git a/lib/kernel/doc/src/Makefile b/lib/kernel/doc/src/Makefile
index 2413541082..10bdf46119 100644
--- a/lib/kernel/doc/src/Makefile
+++ b/lib/kernel/doc/src/Makefile
@@ -56,6 +56,10 @@ XML_REF3_FILES = application.xml \
 	inet.xml \
 	inet_res.xml \
 	init_stub.xml \
+        logger.xml \
+        logger_std_h.xml \
+        logger_filters.xml \
+        logger_formatter.xml \
 	net_adm.xml \
 	net_kernel.xml \
 	os.xml \
@@ -70,11 +74,17 @@ XML_REF4_FILES = app.xml config.xml
 
 XML_REF6_FILES = kernel_app.xml
 
-XML_PART_FILES =
-XML_CHAPTER_FILES = notes.xml
+XML_PART_FILES = part.xml
+XML_CHAPTER_FILES = \
+        notes.xml \
+        introduction_chapter.xml \
+	logger_chapter.xml
 
 BOOK_FILES = book.xml
 
+IMAGE_FILES = \
+	logger_arch.png
+
 XML_FILES = \
 	$(BOOK_FILES) $(XML_CHAPTER_FILES) \
 	$(XML_PART_FILES) $(XML_REF3_FILES) $(XML_REF4_FILES)\
@@ -111,7 +121,7 @@ SPECS_FLAGS = -I../../include
 # ----------------------------------------------------
 # Targets
 # ----------------------------------------------------
-$(HTMLDIR)/%.gif: %.gif
+$(HTMLDIR)/%: %
 	$(INSTALL_DATA) $< $@
 
 docs: man pdf html
@@ -120,11 +130,12 @@ $(TOP_PDF_FILE): $(XML_FILES)
 
 pdf: $(TOP_PDF_FILE)
 
-html: gifs $(HTML_REF_MAN_FILE)
+html: images $(HTML_REF_MAN_FILE)
 
 man: $(MAN3_FILES) $(MAN4_FILES) $(MAN6_FILES)
 
-gifs: $(GIF_FILES:%=$(HTMLDIR)/%)
+images: $(IMAGE_FILES:%=$(HTMLDIR)/%)
+
 debug opt:
 
 clean clean_docs:
diff --git a/lib/kernel/doc/src/book.xml b/lib/kernel/doc/src/book.xml
index 81a87d126d..0b69b547e7 100644
--- a/lib/kernel/doc/src/book.xml
+++ b/lib/kernel/doc/src/book.xml
@@ -34,6 +34,9 @@
   <preamble>
     <contents level="2"></contents>
   </preamble>
+  <parts lift="yes">
+    <xi:include href="part.xml"/>
+  </parts>
   <applications>
     <xi:include href="ref_man.xml"/>
   </applications>
diff --git a/lib/kernel/doc/src/introduction_chapter.xml b/lib/kernel/doc/src/introduction_chapter.xml
new file mode 100644
index 0000000000..6e6990ddda
--- /dev/null
+++ b/lib/kernel/doc/src/introduction_chapter.xml
@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+  <header>
+    <copyright>
+      <year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+ 
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+    
+    </legalnotice>
+
+    <title>Introduction</title>
+    <prepared></prepared>
+    <responsible></responsible>
+    <docno></docno>
+    <approved></approved>
+    <checked></checked>
+    <date></date>
+    <rev></rev>
+    <file>introduction.xml</file>
+  </header>
+
+  <section>
+    <title>Scope</title>
+    <p>The Kernel application has all the code necessary to run
+      the Erlang runtime system: file servers, code servers,
+      and so on.</p>
+    <p>The Kernel application is the first application started. It is
+      mandatory in the sense that the minimal system based on
+      Erlang/OTP consists of Kernel and STDLIB. Kernel
+      contains the following functional areas:</p>
+    <list type="bulleted">
+      <item>Start, stop, supervision, configuration, and distribution of applications</item>
+      <item>Code loading</item>
+      <item>Logging</item>
+      <item>Error logging</item>
+      <item>Global name service</item>
+      <item>Supervision of Erlang/OTP</item>
+      <item>Communication with sockets</item>
+      <item>Operating system interface</item>
+    </list>
+  </section>
+
+  <section>
+    <title>Prerequisites</title>
+    <p>It is assumed that the reader is familiar with the Erlang programming
+      language.</p> 
+  </section>
+</chapter>
+
+
diff --git a/lib/kernel/doc/src/logger.xml b/lib/kernel/doc/src/logger.xml
new file mode 100644
index 0000000000..66e6e5c689
--- /dev/null
+++ b/lib/kernel/doc/src/logger.xml
@@ -0,0 +1,478 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+  <header>
+    <copyright>
+      <year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+
+    </legalnotice>
+
+    <title>logger</title>
+    <prepared></prepared>
+    <responsible></responsible>
+    <docno></docno>
+    <approved></approved>
+    <checked></checked>
+    <date></date>
+    <rev>A</rev>
+    <file>logger.xml</file>
+  </header>
+  <module>logger</module>
+  <modulesummary>API module for the logger application.</modulesummary>
+
+  <description>
+
+  </description>
+
+  <datatypes>
+    <datatype>
+      <name name="level"/>
+      <desc>
+	<p>The severity level for the message to be logged.</p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="log"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="report"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="msg_fun"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="metadata"/>
+      <desc>
+	<p>Metadata associated with the message to be logged.</p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="config"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="handler_id"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="filter_id"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="filter"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="filter_return"/>
+      <desc>
+	<p></p>
+      </desc>
+    </datatype>
+  </datatypes>
+
+  <section>
+    <title>Macros</title>
+    <p>The following macros are defined:</p>
+
+    <list>
+      <item><c>?LOG_EMERGENCY(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_EMERGENCY(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_ALERT(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_ALERT(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_CRITICAL(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_CRITICAL(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_ERROR(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_ERROR(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_WARNING(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_WARNING(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_NOTICE(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_NOTICE(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_INFO(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_INFO(FunOrFormat,Args[,Metadata])</c></item>
+      <item><c>?LOG_DEBUG(StringOrReport[,Metadata])</c></item>
+      <item><c>?LOG_DEBUG(FunOrFormat,Args[,Metadata])</c></item>
+    </list>
+
+    <p>All macros expand to a call to logger, where <c>Level</c> is
+      taken from the macro name, and the following metadata is added,
+      or merged with the given <c>Metadata</c>:</p>
+
+    <code>
+#{mfa=>{?MODULE,?FUNCTION_NAME,?FUNCTION_ARITY},
+        file=>?FILE,
+        line=>?LINE}
+    </code>
+
+    <p>The call is wrapped in a case statement and will be evaluated
+      only if <c>Level</c> is equal to or below the configured log
+      level.</p>
+  </section>
+
+  <funcs>
+    <func>
+      <name>emergency(StringOrReport[,Metadata])</name>
+      <name>emergency(Format,Args[,Metadata])</name>
+      <name>emergency(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>emergency</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(emergency,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>alert(StringOrReport[,Metadata])</name>
+      <name>alert(Format,Args[,Metadata])</name>
+      <name>alert(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>alert</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(alert,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>critical(StringOrReport[,Metadata])</name>
+      <name>critical(Format,Args[,Metadata])</name>
+      <name>critical(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>critical</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(critical,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>error(StringOrReport[,Metadata])</name>
+      <name>error(Format,Args[,Metadata])</name>
+      <name>error(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>error</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(error,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>warning(StringOrReport[,Metadata])</name>
+      <name>warning(Format,Args[,Metadata])</name>
+      <name>warning(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>warning</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(warning,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>notice(StringOrReport[,Metadata])</name>
+      <name>notice(Format,Args[,Metadata])</name>
+      <name>notice(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>notice</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(notice,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>info(StringOrReport[,Metadata])</name>
+      <name>info(Format,Args[,Metadata])</name>
+      <name>info(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>info</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(info,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name>debug(StringOrReport[,Metadata])</name>
+      <name>debug(Format,Args[,Metadata])</name>
+      <name>debug(Fun,FunArgs[,Metadata])</name>
+      <fsummary>Logs the given message as level <c>debug</c>.</fsummary>
+      <desc>
+        <p>Equivalent to
+	<seealso marker="#log-2"><c>log(debug,...)</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="log" arity="2"/>
+      <name name="log" arity="3" clause_i="1"/>
+      <name name="log" arity="3" clause_i="2"/>
+      <name name="log" arity="3" clause_i="3"/>
+      <name name="log" arity="4" clause_i="1"/>
+      <name name="log" arity="4" clause_i="2"/>
+      <fsummary>Logs the given message.</fsummary>
+      <type variable="Level"/>
+      <type variable="StringOrReport" name_i="1"/>
+      <type variable="Format" name_i="3"/>
+      <type variable="Args" name_i="3"/>
+      <type variable="Fun" name_i="4"/>
+      <type variable="FunArgs" name_i="4"/>
+      <type variable="Metadata"/>
+      <desc>
+        <p>Log the given message.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="get_logger_config" arity="0"/>
+      <fsummary>Lookup the current configuration for logger.</fsummary>
+      <desc>
+        <p>Lookup the current configuration for logger.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="get_handler_config" arity="1"/>
+      <fsummary>Lookup the current configuration for the given handler.</fsummary>
+      <desc>
+        <p>Lookup the current configuration for the given handler.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="i" arity="0"/>
+      <fsummary>Get information about all logger configurations</fsummary>
+      <desc>
+        <p>Same as <seealso marker="#i/1"><c>logger:i(term)</c></seealso></p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="i" arity="1" clause_i="1"/>
+      <name name="i" arity="1" clause_i="2"/>
+      <name name="i" arity="1" clause_i="3"/>
+      <fsummary>Get information about all logger configurations</fsummary>
+      <desc>
+        <p>The <c>logger:i/1</c> function can be used to get all
+          current logger configuration.  The way that the information
+          is returned depends on the <c><anno>Action</anno></c></p>
+        <taglist>
+          <tag>string</tag>
+          <item>Return the pretty printed current logger configuration
+            as iodata.</item>
+          <tag>term</tag>
+          <item>Return the current logger configuration as a term. The
+            format of this term may change inbetween releases. For a
+            stable format use <seealso marker="#get_handler_config/1">
+	      <c>logger:get_handler_config/1</c></seealso>
+            and <seealso marker="#get_logger_config/0">
+	      <c>logger:get_logger_config/0</c></seealso>.
+            The same as calling <c>logger:i()</c>.</item>
+	  <tag>print</tag>
+          <item>Pretty print all the current logger configuration to
+            standard out. Example:
+            <code><![CDATA[1> logger:i().
+Current logger configuration:
+  Level: info
+  FilterDefault: log
+  Filters:
+  Handlers:
+    Id: logger_std_h
+      Module:    logger_std_h
+      Level:     info
+      Formatter:
+        Module: logger_formatter
+        Config: #{template => [{logger_formatter,header},"\n",msg,"\n"],
+                  legacy_header => true}
+      Filter Default: stop
+      Filters:
+        Id: stop_progress
+          Fun:    fun logger_filters:progress/2
+          Config: stop
+        Id: remote_gl
+          Fun:    fun logger_filters:remote_gl/2
+          Config: stop
+        Id: domain
+          Fun:    fun logger_filters:domain/2
+          Config: {log,prefix_of,[beam,erlang,otp,sasl]}
+        Id: no_domain
+          Fun:    fun logger_filters:domain/2
+          Config: {log,no_domain,[]}
+      Handler Config:
+        logger_std_h: #{type => standard_io}
+  Level set per module:
+    Module: my_module
+      Level:    debug]]></code>
+          </item>
+        </taglist>
+      </desc>
+    </func>
+
+    <func>
+      <name name="add_logger_filter" arity="2"/>
+      <fsummary>Add a filter to the logger.</fsummary>
+      <desc>
+        <p>Add a filter to the logger.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="add_handler_filter" arity="3"/>
+      <fsummary>Add a filter to the specified handler.</fsummary>
+      <desc>
+        <p>Add a filter to the specified handler.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="remove_logger_filter" arity="1"/>
+      <fsummary>Remove a filter from the logger.</fsummary>
+      <desc>
+        <p>Remove the filter with the specified identity from the logger.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="remove_handler_filter" arity="2"/>
+      <fsummary>Remove a filter from the specified handler.</fsummary>
+      <desc>
+        <p>Remove the filter with the specified identity from the given handler.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="add_handler" arity="3"/>
+      <fsummary>Add a handler with the given configuration.</fsummary>
+      <desc>
+        <p>Add a handler with the given configuration.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="remove_handler" arity="1"/>
+      <fsummary>Remove the handler with the specified identity.</fsummary>
+      <desc>
+        <p>Remove the handler with the specified identity.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="set_module_level" arity="2"/>
+      <fsummary>Set the log level for the specified module.</fsummary>
+      <desc>
+        <p>Set the log level for the specified module.</p>
+        <p>To change the logging level globally, use
+        <seealso marker="#set_logger_config/2"><c>logger:set_logger_config(level, Level)</c></seealso>.
+        </p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="reset_module_level" arity="1"/>
+      <fsummary>Remove a module specific log setting.</fsummary>
+      <desc>
+        <p>Remove a module specific log setting. After this, the
+          global log level is used for the specified module.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="set_logger_config" arity="1"/>
+      <name name="set_logger_config" arity="2"/>
+      <fsummary>Add or update configuration data for the logger.</fsummary>
+      <desc>
+        <p>Add or update configuration data for the logger.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="set_handler_config" arity="2"/>
+      <name name="set_handler_config" arity="3"/>
+      <fsummary>Add or update configuration data for the specified
+        handler.</fsummary>
+      <desc>
+        <p>Add or update configuration data for the specified
+          handler.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="compare_levels" arity="2"/>
+      <fsummary>Compare the severity of two log levels.</fsummary>
+      <desc>
+        <p>Compare the severity of two log levels. Returns <c>gt</c>
+          if <c>Level1</c> is more severe than
+          <c>Level2</c>, <c>lt</c> if <c>Level1</c> is less severe,
+          and <c>eq</c> if the levels are equal.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="set_process_metadata" arity="1"/>
+      <fsummary>Set metadata to use when logging from current process.</fsummary>
+      <desc>
+        <p>Set metadata which <c>logger</c> automatically inserts it
+          in all log events produced on the current
+          process. Subsequent calls will overwrite previous data set
+          by this function.</p>
+	<p>When logging, location data produced by the log macros,
+	  and/or metadata given as argument to the log call (API
+	  function or macro), will be merged with the process
+	  metadata. If the same keys occur, values from the metadata
+	  argument to the log call will overwrite values in the
+	  process metadata, which in turn will overwrite values from
+	  the location data.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="get_process_metadata" arity="0"/>
+      <fsummary>Retrieve data set with set_process_metadata/1.</fsummary>
+      <desc>
+        <p>Retrieve data set
+          with <seealso marker="#set_process_metadata-1">
+	    <c>set_process_metadata/1</c></seealso>.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="unset_process_metadata" arity="0"/>
+      <fsummary>Delete data set with set_process_metadata/1.</fsummary>
+      <desc>
+        <p>Delete data set
+          with <seealso marker="#set_process_metadata-1">
+	    <c>set_process_metadata/1</c></seealso>.</p>
+      </desc>
+    </func>
+
+  </funcs>
+
+</erlref>
+
+
diff --git a/lib/kernel/doc/src/logger_arch.png b/lib/kernel/doc/src/logger_arch.png
new file mode 100644
index 0000000000..727609a6ef
--- /dev/null
+++ b/lib/kernel/doc/src/logger_arch.png
diff --git a/lib/kernel/doc/src/logger_chapter.xml b/lib/kernel/doc/src/logger_chapter.xml
new file mode 100644
index 0000000000..2a325453da
--- /dev/null
+++ b/lib/kernel/doc/src/logger_chapter.xml
@@ -0,0 +1,641 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+  <header>
+    <copyright>
+      <year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+ 
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+    
+    </legalnotice>
+
+    <title>Logging</title>
+    <prepared></prepared>
+    <docno></docno>
+    <date></date>
+    <rev></rev>
+    <file>logger_chapter.xml</file>
+  </header>
+
+  <section>
+    <title>Overview</title>
+    <p>Erlang/OTP provides a standard API for logging. The backend of
+      this API can be used as is, or it can be customized to suite
+      specific needs.</p>
+    <p>It consists of two parts - the <em>logger</em> part and the
+      <em>handler</em> part. The logger will forward log events to one
+      or more handler(s).</p>
+
+    <image file="logger_arch.png">
+      <icaption>Conceptual overview</icaption>
+    </image>
+
+    <p><em>Filters</em> can be added to the logger and to each
+      handler. The filters decide if an event is to be forwarded or
+      not, and they can also modify all parts of the log event.</p>
+
+    <p>A <em>formatter</em> can be set for each handler. The formatter
+      does the final formatting of the log event, including the log
+      message itself, and possibly a timestamp, header and other
+      metadata.</p>
+
+    <p>In accordance with the Syslog protocol, RFC-5424, eight
+      severity levels can be specified:</p>
+
+    <table align="left">
+      <row>
+	<cell><strong>Level</strong></cell>
+	<cell align="center"><strong>Integer</strong></cell>
+	<cell><strong>Description</strong></cell>
+      </row>
+      <row>
+	<cell>emergency</cell>
+	<cell align="center">0</cell>
+	<cell>system is unusable</cell>
+      </row>
+      <row>
+	<cell>alert</cell>
+	<cell align="center">1</cell>
+	<cell>action must be taken immediately</cell>
+      </row>
+      <row>
+	<cell>critical</cell>
+	<cell align="center">2</cell>
+	<cell>critical contidions</cell>
+      </row>
+      <row>
+	<cell>error</cell>
+	<cell align="center">3</cell>
+	<cell>error conditions</cell>
+      </row>
+      <row>
+	<cell>warning</cell>
+	<cell align="center">4</cell>
+	<cell>warning conditions</cell>
+      </row>
+      <row>
+	<cell>notice</cell>
+	<cell align="center">5</cell>
+	<cell>normal but significant conditions</cell>
+      </row>
+      <row>
+	<cell>info</cell>
+	<cell align="center">6</cell>
+	<cell>informational messages</cell>
+      </row>
+      <row>
+	<cell>debug</cell>
+	<cell align="center">7</cell>
+	<cell>debug-level messages</cell>
+      </row>
+      <tcaption>Severity levels</tcaption>
+    </table>
+
+    <p>A log event is allowed by Logger if the integer value of
+      its <c>Level</c> is less than or equal to the currently
+      configured log level. The log level can be configured globally,
+      or to allow more verbose logging from a specific part of the
+      system, per module.</p>
+
+    <section>
+      <title>Customizable parts</title>
+
+      <taglist>
+	<tag><marker id="Handler"/>Handler</tag>
+	<item>
+	  <p>A handler is defined as a module exporting the following
+	    function:</p>
+
+	  <code>log(Log, Config) -> ok</code>
+
+	  <p>A handler is called by the logger backend after filtering on
+	    logger level and on handler level for the handler which is
+	    about to be called. The function call is done on the client
+	    process, and it is up to the handler implementation if other
+	    processes are to be involved or not.</p>
+
+	  <p>Multiple instances of the same handler can be
+	    added. Configuration is per instance.</p>
+
+	</item>
+
+	<tag><marker id="Filter"/>Filter</tag>
+	<item>
+	  <p>Filters can be set on the logger or on a handler. Logger
+	    filters are applied first, and if passed, the handler filters
+	    for each handler are applied. The handler plugin is only
+	    called if all handler filters for the handler in question also
+	    pass.</p>
+
+	  <p>A filter is specified as:</p>
+
+	  <code>{fun((Log,Extra) -> Log | stop | ignore), Extra}</code>
+
+	  <p>The configuration parameter <c>filter_default</c>
+	    specifies the behavior if all filters return <c>ignore</c>.
+	    <c>filter_default</c> is by default set to <c>log</c>.</p>
+
+	  <p>The <c>Extra</c> parameter may contain any data that the
+	    filter needs.</p>
+	</item>
+
+	<tag><marker id="Formatter"/>Formatter</tag>
+	<item>
+	  <p>A formatter is defined as a module exporting the following
+	    function:</p>
+
+	  <code>format(Log,Extra) -> string()</code>
+
+	  <p>The formatter plugin is called by each handler, and the
+	    returned string can be printed to the handler's destination
+	    (stdout, file, ...).</p>
+	</item>
+
+      </taglist>
+    </section>
+
+    <section>
+      <title>Built-in handlers</title>
+
+      <taglist>
+	<tag><c>logger_std_h</c></tag>
+	<item>
+	  <p>This is the default handler used by OTP. Multiple instances
+	    can be started, and each instance will write log events to a
+	    given destination, console or file. Filters can be used for
+	    selecting which event to send to which handler instance.</p>
+	</item>
+
+	<tag><c>logger_disk_log_h</c></tag>
+	<item>
+	  <p>This handler behaves much like logger_std_h, except it uses
+	    <seealso marker="disk_log"><c>disk_log</c></seealso> as its
+	    destination.</p>
+	</item>
+
+	<tag><marker id="ErrorLoggerManager"/><c>error_logger</c></tag>
+	<item>
+	  <p>This handler is to be used for backwards compatibility
+	    only. It is not started by default, but will be automatically
+	    started the first time an event handler is added
+	    with <seealso marker="error_logger#add_report_handler-1">
+	      <c>error_logger:add_report_handler/1,2</c></seealso>.</p>
+
+	  <p>No built-in event handlers exist.</p>
+	</item>
+      </taglist>
+    </section>
+
+    <section>
+      <title>Built-in filters</title>
+
+      <taglist>
+	<tag><c>logger_filters:domain/2</c></tag>
+	<item>
+	  <p>This filter provides a way of filtering log events based on a
+	    <c>domain</c> field <c>Metadata</c>. See 
+	    <seealso marker="logger_filters#domain-2">
+	    <c>logger_filters:domain/2</c></seealso></p>
+	</item>
+
+	<tag><c>logger_filters:level/2</c></tag>
+	<item>
+	  <p>This filter provides a way of filtering log events based
+	    on the log level. See <seealso marker="logger_filters#domain-2">
+	    <c>logger_filters:domain/2</c></seealso></p>
+	</item>
+
+	<tag><c>logger_filters:progress/2</c></tag>
+	<item>
+	  <p>This filter matches all progress reports
+	    from <c>supervisor</c> and <c>application_controller</c>.
+	    See <seealso marker="logger_filters#progress/2">
+	    <c>logger_filters:progress/2</c></seealso></p>
+	</item>
+
+	<tag><c>logger_filters:remote_gl/2</c></tag>
+	<item>
+	  <p>This filter matches all events originating from a process
+	    that has its group leader on a remote node.
+	    See <seealso marker="logger_filters#remote_gl/2">
+	    <c>logger_filters:remote_gl/2</c></seealso></p>
+	</item>
+      </taglist>
+    </section>
+
+    <section>
+      <title>Default formatter</title>
+
+      <p>The default formatter is <c>logger_formatter</c>.
+	See <seealso marker="logger_formatter#format-2">
+	  <c>logger_formatter:format/2</c></seealso>.</p>
+    </section>
+  </section>
+
+  <section>
+    <title>Configuration</title>
+
+    <section>
+      <title>Application environment variables</title>
+      <p>See <seealso marker="kernel_app#configuration">Kernel(6)</seealso> for
+	information about the application environment variables that can
+	be used for configuring logger.</p>
+    </section>
+
+    <section>
+      <title>Logger configuration</title>
+
+      <taglist>
+	<tag><c>level</c></tag>
+	<item>
+	  <p>Specifies the severity level to log.</p>
+	</item>
+	<tag><c>filters</c></tag>
+	<item>
+	  <p>Logger filters are added or removed with
+	    <seealso marker="logger#add_logger_filter-2">
+	      <c>logger:add_logger_filter/2</c></seealso> and
+	    <seealso marker="logger#remove_logger_filter-1">
+	      <c>logger:remove_logger_filter/1</c></seealso>,
+	    respectively.</p>
+	  <p>See <seealso marker="#Filter">Filter</seealso> for more
+	    information.</p>
+	  <p>By default, no filters exist.</p>
+	</item>
+	<tag><c>filter_default = log | stop</c></tag>
+	<item>
+	  <p>Specifies what to do with an event if all filters
+	    return <c>ignore</c>.</p>
+	  <p>Default is <c>log</c>.</p>
+	</item>
+	<tag><c>handlers</c></tag>
+	<item>
+	  <p>Handlers are added or removed with
+	    <seealso marker="logger#add_handler-3">
+	      <c>logger:add_handler/3</c></seealso> and
+	    <seealso marker="logger#remove_handler-1">
+	      <c>logger:remove_handler/1</c></seealso>,
+	    respectively.</p>
+	  <p>See <seealso marker="#Handler">Handler</seealso> for more
+	    information.</p>
+	</item>
+      </taglist>
+    </section>
+
+    <section>
+      <title>Handler configuration</title>
+      <taglist>
+	<tag><c>level</c></tag>
+	<item>
+	  <p>Specifies the severity level to log.</p>
+	</item>
+	<tag><c>filters</c></tag>
+	<item>
+	  <p>Handler filters can be specified when adding the handler,
+	    or added or removed later with
+	    <seealso marker="logger#add_handler_filter-3">
+	      <c>logger:add_handler_filter/3</c></seealso> and
+	    <seealso marker="logger#remove_handler_filter-2">
+	      <c>logger:remove_handler_filter/2</c></seealso>,
+	    respectively.</p>
+	  <p>See <seealso marker="#Filter">Filter</seealso> for more
+	    information.</p>
+	  <p>By default, no filters exist.</p>
+	</item>
+	<tag><c>filter_default = log | stop</c></tag>
+	<item>
+	  <p>Specifies what to do with an event if all filters
+	    return <c>ignore</c>.</p>
+	  <p>Default is <c>log</c>.</p>
+	</item>
+        <tag><c>depth = pos_integer() | unlimited</c></tag>
+	<item>
+	  <p>Specifies if the depth of terms in the log events shall
+	    be limited by using control characters <c>~P</c>
+	    and <c>~W</c> instead of <c>~p</c> and <c>~w</c>,
+	    respectively. See
+	    <seealso marker="stdlib:io#format-1"><c>io:format</c></seealso>.</p>
+	</item>
+        <tag><c>max_size = pos_integer() | unlimited</c></tag>
+	<item>
+	  <p>Specifies if the size of a log event shall be limited by
+	    truncating the formatted string.</p>
+	</item>
+	<tag><c>formatter = {Module::module(),Extra::term()}</c></tag>
+	<item>
+	  <p>See <seealso marker="#Formatter">Formatter</seealso> for more
+	    information.</p>
+	  <p>The default module is <seealso marker="logger_formatter">
+	      <c>logger_formatter</c></seealso>, and <c>Extra</c> is
+	      it's configuration map.</p>
+	</item>
+      </taglist>
+
+      <p>Note that <c>level</c> and <c>filters</c> are obeyed by
+	Logger itself before forwarding the log events to each
+	handler, while <c>depth</c>, <c>max_size</c>
+	and <c>formatter</c> are left to the handler
+	implementation. All Logger's built-in handlers do apply these
+	configuration parameters before printing.</p>
+    </section>
+
+  </section>
+
+  <section>
+    <marker id="compatibility"/>
+    <title>Backwards compatibility with error_logger</title>
+    <p>Logger provides backwards compatibility with the old
+      <c>error_logger</c> in the following ways:</p>
+
+    <taglist>
+      <tag>Legacy event handlers</tag>
+      <item>
+	<p>To use event handlers written for <c>error_logger</c>, just
+	  add your event handler with</p>
+	<code>
+error_logger:add_report_handler/1,2.
+	</code>
+	<p>This will automatically start the <c>error_logger</c>
+	  event manager, and add <c>error_logger</c> as a
+	  handler to <c>logger</c>, with configuration</p>
+<code>
+#{level=>info,
+  filter_default=>log,
+  filters=>[]}.
+</code>
+	<p>Note that this handler will ignore events that do not
+	  originate from the old <c>error_logger</c> API, or from
+	  within OTP. This means that if your code uses the logger API
+	  for logging, then your log events will be discarded by this
+	  handler.</p>
+	<p>Also note that <c>error_logger</c> is not overload
+	  protected.</p>
+      </item>
+      <tag>Logger API</tag>
+      <item>
+	<p>The old <c>error_logger</c> API still exists, but should
+	  only be used by legacy code. It will be removed in a later
+	  release.</p>
+      </item>
+      <tag>Output format</tag>
+      <item>
+	<p>To get log events on the same format as produced
+	  by <c>error_logger_tty_h</c> and <c>error_logger_file_h</c>,
+	  use the default formatter, <c>logger_formatter</c>, with
+	  configuration parameter <c>legacy_header=>true</c>. This is
+	  also the default.</p>
+      </item>
+      <tag>Default format of log events from OTP</tag>
+      <item>
+	<p>By default, all log events originating from within OTP,
+	  except the former so called "SASL reports", look the same as
+	  before.</p>
+      </item>
+      <tag>SASL reports</tag>
+      <item>
+	<p>By SASL reports we mean supervisor reports, crash reports
+	  and progress reports.</p>
+	<p>In earlier releases, these reports were only logged when
+	  the SASL application was running, and they were printed
+	  trough specific event handlers
+	  named <c>sasl_report_tty_h</c>
+	  and <c>sasl_report_file_h</c>.</p>
+	<p>The destination of these log events were configured by
+	  environment variables for the SASL application.</p>
+	<p>Due to the specific event handlers, the output format
+	  slightly differed from other log events.</p>
+	<p>As of OTP-21, the concept of SASL reports is removed,
+	  meaning that the default behavior is as follows:</p>
+	<list>
+	  <item>Supervisor reports, crash reports and progress reports
+	    are no longer connected to the SASL application.</item>
+	  <item>Supervisor reports and crash reports are logged by
+	    default.</item>
+	  <item>Progress reports are not logged by default, but can be
+	    enabled with the kernel environment
+	    variable <c>logger_log_progress</c>.</item>
+	  <item>The output format is the same for all log
+	    events.</item>
+	</list>
+	<p>If the old behavior is preferred, the kernel environment
+	  variable <c>logger_sasl_compatible</c> can be set
+	  to <c>true</c>. The old SASL environment variables can then
+	  be used as before, and the SASL reports will only be printed
+	  if the SASL application is running - through a second log
+	  handler named <c>sasl_h</c>.</p>
+	<p>All SASL reports have a metadata
+	  field <c>domain=>[beam,erlang,otp,sasl]</c>, which can be
+	  used, for example, by filters to to stop or allow the
+	  events.</p>
+      </item>
+    </taglist>
+  </section>
+
+
+  <section>
+    <title>Error handling</title>
+    <p>Log data is expected to be either a format string and
+      arguments, a string (unicode:chardata), or a report (map or
+      key-value list) which can be converted to a format string and
+      arguments by the handler. A default report callback should be
+      included in the log event's metadata, which can be used for
+      converting the report to a format string and arguments. The
+      handler might also do a custom conversion if the default format
+      is not desired.</p>
+    <p><c>logger</c> does, to a certain extent, check its input data
+      before forwarding a log event to the handlers, but it does not
+      evaluate conversion funs or check the validity of format strings
+      and arguments. This means that any filter or handler must be
+      careful when formatting the data of a log event, making sure
+      that it does not crash due to bad input data or faulty
+      callbacks.</p>
+    <p>If a filter or handler still crashes, logger will remove the
+      filter or handler in question from the configuration, and then
+      print a short error message on the console. A debug event
+      containing the crash reason and other details is also issued,
+      and can be seen if a handler is installed which logs on debug
+      level.</p>
+  </section>
+
+  <section>
+    <title>Example: add a handler to log debug events to file</title>
+    <p>When starting an erlang node, the default behavior is that all
+      log events with level info and above are logged to the
+      console. In order to also log debug events, you can either
+      change the global log level to <c>debug</c> or add a separate
+      handler to take care of this. In this example we will add a new
+      handler which prints the debug events to a separate file.</p>
+    <p>First, we add an instance of logger_std_h with
+      type <c>{file,File}</c>, and we set the handler's level
+      to <c>debug</c>:</p>
+    <pre>
+1> <input>Config = #{level=>debug,logger_std_h=>#{type=>{file,"./debug.log"}}}.</input>
+#{logger_std_h => #{type => {file,"./debug.log"}},
+  level => debug}
+2> <input>logger:add_handler(debug_handler,logger_std_h,Config).</input>
+ok</pre>
+    <p>By default, the handler receives all events, so we need to add a filter
+      to stop all non-debug events:</p>
+    <pre>
+3> <input>Fun = fun(#{level:=debug}=Log,_) -> Log; (_,_) -> stop end.</input>
+#Fun&lt;erl_eval.12.98642416>
+4> <input>logger:add_handler_filter(debug_handler,allow_debug,{Fun,[]}).</input>
+ok</pre>
+    <p>And finally, we need to make sure that the logger itself allows
+      debug events. This can either be done by setting the global
+      logger level:</p>
+    <pre>
+5> <input>logger:set_logger_config(level,debug).</input>
+ok</pre>
+    <p>Or by allowing debug events from one or a few modules only:</p>
+    <pre>
+6> <input>logger:set_module_level(mymodule,debug).</input>
+ok</pre>
+
+  </section>
+
+  <section>
+    <title>Example: implement a handler</title>
+    <p>The only requirement that a handler MUST fulfill is to export
+      the following function:</p>
+    <code>log(logger:log(),logger:config()) ->ok</code>
+    <p>It may also implement the following callbacks:</p>
+    <code>
+adding_handler(logger:handler_id(),logger:config()) -> {ok,logger:config()} | {error,term()}
+removing_handler(logger:handler_id()) -> ok
+changing_config(logger:handler_id(),logger:config(),logger:config()) -> {ok,logger:config()} | {error,term()}
+    </code>
+    <p>When logger:add_handler(Id,Module,Config) is called, logger
+      will first call Module:adding_handler(Id,Config), and if it
+      returns {ok,NewConfig} the NewConfig is written to the
+      configuration database. After this, the handler may receive log
+      events as calls to Module:log/2.</p>
+    <p>A handler can be removed by calling
+      logger:remove_handler(Id). logger will call
+      Module:removing_handler(Id), and then remove the handler's
+      configuration from the configuration database.</p>
+    <p>When logger:set_handler_config is called, logger calls
+      Module:changing_config(Id,OldConfig,NewConfig). If this function
+      returns ok, the NewConfig is written to the configuration
+      database.</p>
+
+    <p>A simple handler which prints to the console could be
+      implemented as follows:</p>
+    <code>
+-module(myhandler).
+-export([log/2]).
+
+log(#{msg:={report,R}},_) ->
+    io:format("~p~n",[R]);
+log(#{msg:={string,S}},_) ->
+    io:put_chars(S);
+log(#{msg:={F,A}},_) ->
+    io:format(F,A).
+    </code>
+
+    <p>A simple handler which prints to file could be implemented like
+      this:</p>
+    <code>
+-module(myhandler).
+-export([adding_handler/2, removing_handler/1, log/2]).
+-export([init/1, handle_call/3, handle_cast/2, terminate/2]).
+
+adding_handler(Id,Config) ->
+    {ok,Fd} = file:open(File,[append,{encoding,utf8}]),
+    {ok,Config#{myhandler_fd=>Fd}}.
+
+removing_handler(Id,#{myhandler_fd:=Fd}) ->
+    _ = file:close(Fd),
+    ok.
+
+log(#{msg:={report,R}},#{myhandler_fd:=Fd}) ->
+    io:format(Fd,"~p~n",[R]);
+log(#{msg:={string,S}},#{myhandler_fd:=Fd}) ->
+    io:put_chars(Fd,S);
+log(#{msg:={F,A}},#{myhandler_fd:=Fd}) ->
+    io:format(Fd,F,A).
+    </code>
+
+    <p>Note that none of the above handlers have any overload
+      protection, and all log events are printed directly from the
+      client process. Neither do the handlers use the formatter or
+      in any way add time or other metadata to the printed events.</p>
+
+    <p>For examples of overload protection, please refer to the
+      implementation
+      of <seealso marker="logger_std_h"><c>logger_std_h</c></seealso>
+      and <!--<seealso marker="logger_disk_log_h"--><c>logger_disk_log_h</c>
+      <!--/seealso-->.</p>
+
+    <p>Below is a simpler example of a handler which logs through one
+      single process, and uses the default formatter to gain a common
+      look of the log events.</p>
+    <p>It also uses the metadata field <c>report_cb</c>, if it exists,
+      to print reports in the way the event issuer suggests. The
+      formatter will normally do this, but if the handler either has
+      an own default (as in this example) or if the
+      given <c>report_cb</c> should not be used at all, then the
+      handler must take care of this itself.</p>
+    <code>
+-module(myhandler).
+-export([adding_handler/2, removing_handler/1, log/2]).
+-export([init/1, handle_call/3, handle_cast/2, terminate/2]).
+
+adding_handler(Id,Config) ->
+    {ok,Pid} = gen_server:start(?MODULE,Config),
+    {ok,Config#{myhandler_pid=>Pid}}.
+
+removing_handler(Id,#{myhandler_pid:=Pid}) ->
+    gen_server:stop(Pid).
+
+log(Log,#{myhandler_pid:=Pid} = Config) ->
+    gen_server:cast(Pid,{log,Log,Config}).
+
+init(#{myhandler_file:=File}) ->
+    {ok,Fd} = file:open(File,[append,{encoding,utf8}]),
+    {ok,#{file=>File,fd=>Fd}}.
+
+handle_call(_,_,State) ->
+    {reply,{error,bad_request},State}.
+
+handle_cast({log,Log,Config},#{fd:=Fd} = State) ->
+    do_log(Fd,Log,Config),
+    {noreply,State}.
+
+terminate(Reason,#{fd:=Fd}) ->
+    _ = file:close(Fd),
+    ok.
+
+do_log(Fd,#{msg:={report,R}} = Log, Config) ->
+    Fun = maps:get(report_cb,Config,fun my_report_cb/1,
+    {F,A} = Fun(R),
+    do_log(Fd,Log#{msg=>{F,A},Config);
+do_log(Fd,Log,#{formatter:={FModule,FConfig}}) ->
+    String = FModule:format(Log,FConfig),
+    io:put_chars(Fd,String).
+
+my_report_cb(R) ->
+    {"~p",[R]}.
+    </code>
+  </section>
+
+
+  <section>
+    <title>See Also</title>
+    <p><seealso marker="error_logger"><c>error_logger(3)</c></seealso>,
+    <seealso marker="sasl:sasl_app"><c>SASL(6)</c></seealso></p>
+  </section>
+</chapter>
diff --git a/lib/kernel/doc/src/logger_filters.xml b/lib/kernel/doc/src/logger_filters.xml
new file mode 100644
index 0000000000..d742391e35
--- /dev/null
+++ b/lib/kernel/doc/src/logger_filters.xml
@@ -0,0 +1,191 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+  <header>
+    <copyright>
+      <year>2018</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+
+    </legalnotice>
+
+    <title>logger_filters</title>
+    <prepared></prepared>
+    <responsible></responsible>
+    <docno></docno>
+    <approved></approved>
+    <checked></checked>
+    <date></date>
+    <rev>A</rev>
+    <file>logger_filters.xml</file>
+  </header>
+  <module>logger_filters</module>
+  <modulesummary>Filters to use with logger.</modulesummary>
+
+  <description>
+    <p>Filters to use with logger. All functions exported from this
+      module can be used as logger or handler
+      filters. See <seealso marker="logger#add_logger_filter-2">
+	<c>logger:add_logger_filter/2</c></seealso>
+      and <seealso marker="logger#add_handler_filter-3">
+	<c>logger:add_handler_filter/3</c></seealso>
+      for more information about how filters are added.</p>
+  </description>
+
+  <funcs>
+    <func>
+      <name name="domain" arity="2"/>
+      <fsummary>Filter log events based on the domain field in metadata.</fsummary>
+      <desc>
+	  <p>This filter provides a way of filtering log events based on a
+	    <c>domain</c> field <c>Metadata</c>.</p>
+
+	  <p>The <c><anno>Extra</anno></c> parameter is specified when
+	    adding the filter
+	    via <seealso marker="logger#add_logger_filter-2">
+	      <c>logger:add_logger_filter/2</c></seealso>
+	    or <seealso marker="logger#add_handler_filter-3">
+	      <c>logger:add_handler_filter/3</c></seealso>.</p>
+
+	  <p>The filter compares the value of the <c>domain</c> field
+	    in the log event's metadata (<c>Domain</c>)
+	    to <c><anno>MatchDomain</anno></c> as follows:</p>
+
+	  <taglist>
+	    <tag><c><anno>Compare</anno> = starts_with</c></tag>
+	    <item><p>The filter matches if <c>MatchDomain</c> is a prefix
+	      of <c>Domain</c>.</p></item>
+	    <tag><c><anno>Compare</anno> = prefix_of</c></tag>
+	    <item><p>The filter matches if <c>Domain</c> is a prefix
+	      of <c>MatchDomain</c>.</p></item>
+	    <tag><c><anno>Compare</anno> = equals</c></tag>
+	    <item><p>The filter matches if <c>Domain</c> is equal
+	      to <c>MatchDomain</c>.</p></item>
+	    <tag><c><anno>Compare</anno> = no_domain</c></tag>
+	    <item><p>The filter matches if there is no domain field in
+	      metadata. In this case <c><anno>MatchDomain</anno></c> shall
+	      be <c>[]</c>.</p></item>
+	  </taglist>
+
+          <p>If the filter matches and <c><anno>Action</anno> =
+            log</c>, the log event is allowed. If the filter matches
+            and <c><anno>Action</anno> = stop</c>, the log event is
+            stopped.</p>
+
+	  <p>If the filter does not match, it returns <c>ignore</c>,
+	    meaning that other filters, or the value of the
+	    configuration parameter <c>filter_default</c>, will decide
+	    if the event is allowed or not.</p>
+
+	  <p>Log events that do not contain any domain field, will
+	    only match when <c><anno>Compare</anno> = no_domain</c>.</p>
+
+	  <p>Example: stop all events with
+	    domain <c>[beam,erlang,otp,sasl|_]</c></p>
+
+	  <code>
+logger:set_handler_config(h1,filter_default,log). % this is the default
+Filter = {fun logger_filters:domain/2,{stop,starts_with,[beam,erlang,otp,sasl]}}.
+logger:add_handler_filter(h1,no_sasl,Filter).
+ok</code>
+      </desc>
+    </func>
+
+    <func>
+      <name name="level" arity="2"/>
+      <fsummary>Filter log events based on the log level.</fsummary>
+      <desc>
+	  <p>This filter provides a way of filtering log events based
+	    on the log level. It matches log events by comparing the
+	    log level with a predefined <c>MatchLevel</c></p>
+
+	  <p>The <c><anno>Extra</anno></c> parameter is specified when
+	    adding the filter
+	    via <seealso marker="logger#add_logger_filter-2">
+	      <c>logger:add_logger_filter/2</c></seealso>
+	    or <seealso marker="logger#add_handler_filter-3">
+	      <c>logger:add_handler_filter/3</c></seealso>.</p>
+
+	  <p>The filter compares the value of the event's log level
+	    (<c>Level</c>) to <c><anno>MatchLevel</anno></c> by
+	    calling <seealso marker="logger#compare_levels-2">
+	      <c>logger:compare_levels(Level,MatchLevel) -> CmpRet</c></seealso>. It
+	    matches the event if:</p>
+
+	  <list>
+	    <item><c>CmpRet = eq</c> and <c><anno>Operator</anno> =
+		eq | lteq | gteq</c></item>
+	    <item><c>CmpRet = lt</c> and <c><anno>Operator</anno> =
+		lt | lteq | neq</c></item>
+	    <item><c>CmpRet = gt</c> and <c><anno>Operator</anno> =
+		gt | gteq | neq</c></item>
+	  </list>
+
+          <p>If the filter matches and <c><anno>Action</anno> =
+            log</c>, the log event is allowed. If the filter matches
+            and <c><anno>Action</anno> = stop</c>, the log event is
+            stopped.</p>
+
+	  <p>If the filter does not match, it returns <c>ignore</c>,
+	    meaning that other filters, or the value of the
+	    configuration parameter <c>filter_default</c>, will decide
+	    if the event is allowed or not.</p>
+
+	  <p>Example: only allow debug level log events</p>
+
+	  <code>
+logger:set_handler_config(h1,filter_default,stop).
+Filter = {fun logger_filters:level/2,{log,eq,debug}}.
+logger:add_handler_filter(h1,debug_only,Filter).
+ok</code>
+      </desc>
+    </func>
+
+    <func>
+      <name name="progress" arity="2"/>
+      <fsummary>Filter progress reports from supervisor and application_controller.</fsummary>
+      <desc>
+	  <p>This filter matches all progress reports
+	    from <c>supervisor</c> and <c>application_controller</c>.</p>
+
+	  <p>If <c><anno>Extra</anno> = log</c>, the progress reports
+	    are allowed. If <c><anno>Extra</anno> = stop</c>, the
+	    progress reports are stopped.</p>
+
+	  <p>The filter returns <c>ignore</c> for all other log events.</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="remote_gl" arity="2"/>
+      <fsummary>Filter events with group leader on remote node.</fsummary>
+      <desc>
+	  <p>This filter matches all events originating from a process
+	    that has its group leader on a remote node.</p>
+
+	  <p>If <c><anno>Extra</anno> = log</c>, the matching events
+	    are allowed. If <c><anno>Extra</anno> = stop</c>, the
+	    matching events are stopped.</p>
+
+	  <p>The filter returns <c>ignore</c> for all other log events.</p>
+      </desc>
+    </func>
+
+  </funcs>
+
+</erlref>
+
+
diff --git a/lib/kernel/doc/src/logger_formatter.xml b/lib/kernel/doc/src/logger_formatter.xml
new file mode 100644
index 0000000000..213a592e47
--- /dev/null
+++ b/lib/kernel/doc/src/logger_formatter.xml
@@ -0,0 +1,149 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+  <header>
+    <copyright>
+      <year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+
+    </legalnotice>
+
+    <title>logger_formatter</title>
+    <prepared></prepared>
+    <responsible></responsible>
+    <docno></docno>
+    <approved></approved>
+    <checked></checked>
+    <date></date>
+    <rev>A</rev>
+    <file>logger_formatter.xml</file>
+  </header>
+  <module>logger_formatter</module>
+  <modulesummary>Default formatter for the Logger application.</modulesummary>
+
+  <description>
+    <p>Default formatter for the Logger application.</p>
+  </description>
+
+  <datatypes>
+    <datatype>
+      <name name="template"/>
+      <desc>
+      </desc>
+    </datatype>
+  </datatypes>
+
+  <funcs>
+    <func>
+      <name name="format" arity="2"/>
+      <fsummary>Formats the given message.</fsummary>
+      <desc>
+        <p>Formats the given message.</p>
+	<p>The template is a list of atoms, tuples and strings. Atoms
+	  can be <c>level</c> or <c>msg</c>, which are placeholders
+	  for the severity level and the log message,
+	  repectively. Tuples are interpreted as placeholders for
+	  metadata. Each element in the tuple must be an atom which
+	  matches a key in the nested metadata map, e.g. the
+	  tuple <c>{key1,key2}</c> will be replaced by the value of
+	  the key2 field in this nested map (the value vill be
+	  converted to a string):</p>
+
+<code>
+#{key1=>#{key2=>my_value,
+          ...},
+  ...}</code>
+
+
+        <p> Strings are printed literally.</p>
+
+	<p><c>depth</c> is a positive integer representing the maximum
+	  depth to which terms shall be printed by this
+	  formatter. Format strings passed to this formatter are
+	  rewritten. The format controls ~p and ~w are replaced with
+	  ~P and ~W, respectively, and the value is used as the depth
+	  parameter. For details, see
+	  <seealso marker="stdlib:io#format-2">io:format/2</seealso>
+	  in STDLIB.</p>
+
+	<p><c>max_size</c> is a positive integer representing the
+	  maximum size a string returned from this formatter can
+	  have. If the formatted string is longer, it will be
+	  truncated.</p>
+
+	<p><c>utc</c> is a boolean. If set to true, all dates are
+	  displayed in Universal Coordinated Time. Default
+	  is <c>false</c>.</p>
+
+	<p><c>report_cb</c> must be a function with arity 1,
+	  returning <c>{Format,Args}</c>. This function will replace
+	  any <c>report_cb</c> found in metadata.</p>
+
+	<p>If <c>single_line=true</c>, all newlines in the message are
+	  replaced with <c>", "</c>, and whitespaces following directly
+	  after newlines are removed. Note that newlines added by the
+	  formatter template are not replaced.</p>
+
+	<p>If <c>legacy_header=true</c> a header field is added to
+	  logger_formatter's part of <c>Metadata</c>. The value of
+	  this field is a string similar to the header created by the
+	  old <c>error_logger</c> event handlers. It can be included
+	  in the log event by adding the
+	  tuple <c>{logger_formatter,header}</c> to the template.</p>
+
+	<p>The default template when <c>legacy_header=true</c> is</p>
+
+	<code>[{logger_formatter,header},"\n",msg,"\n"]</code>
+
+	<p>which will cause log entries like this:</p>
+
+	<code>=ERROR REPORT==== 29-Dec-2017::13:30:51.245123 ===
+    process: &lt;0.74.0&gt;
+    exit_reason: "Something went wrong"</code>
+
+	<p>Note that all eight levels might occur here, not
+	  only <c>ERROR</c>, <c>WARNING</c> or <c>INFO</c>. And also
+	  that micro seconds are added at the end of the
+	  timestamp.</p>
+
+	<p>The default template when <c>single_line=true</c> is</p>
+
+	<code>[time," ",level,": ",msg,"\n"]</code>
+
+	<p>which will cause log entries like this:</p>
+
+	<code>2017-12-29 13:31:49.640317 error: process: &lt;0.74.0&gt;, exit_reason: "Something went wrong"</code>
+
+	<p>The default template when both <c>legacy_header</c> and
+	  <c>single_line</c> are set to false is:</p>
+
+	<code>[time," ",level,":\n",msg,"\n"]</code>
+
+	<p>which will cause log entries like this:</p>
+
+	<code>2017-12-29 13:32:25.191925 error:
+    process: &lt;0.74.0&gt;
+    exit_reason: "Something went wrong"</code>
+
+      </desc>
+    </func>
+
+  </funcs>
+
+</erlref>
+
+
diff --git a/lib/kernel/doc/src/logger_std_h.xml b/lib/kernel/doc/src/logger_std_h.xml
new file mode 100644
index 0000000000..2a368b16eb
--- /dev/null
+++ b/lib/kernel/doc/src/logger_std_h.xml
@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+  <header>
+    <copyright>
+      <year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+
+    </legalnotice>
+
+    <title>logger_std_h</title>
+    <prepared></prepared>
+    <responsible></responsible>
+    <docno></docno>
+    <approved></approved>
+    <checked></checked>
+    <date></date>
+    <rev>A</rev>
+    <file>logger_std_h.xml</file>
+  </header>
+  <module>logger_std_h</module>
+  <modulesummary>Default handler for the Logger application.</modulesummary>
+
+  <description>
+    <p>This is the default handler for the Logger
+      application. Multiple instances of this handler can be added to
+      logger, and each instance will print logs to <c>standard_io</c>,
+      <c>standard_error</c> or to a file.</p>
+
+    <p>To add a new instance,
+      use <seealso marker="logger#add_handler-3"><c>logger:add_handler/3</c>
+      </seealso>.</p>
+
+    <p>The handler configuration may contain the following keys,
+      associated with values as described:</p>
+    <taglist>
+      <tag><c>filters</c></tag>
+      <item>
+	<p>A list of <c>{Id,{Fun,Args}}</c>, each representing a filter
+	  that may selct or modify log events to forward to this
+	  handler.</p></item>
+      <tag><c>filter_default</c></tag>
+      <item>
+	<p>The atom <c>log</c> or <c>stop</c>, specifying what to
+	  do with a log event if all filters
+	  return <c>ignore</c>.</p></item>
+      <tag><c>formatter</c></tag>
+      <item>
+	<p><c>{Module,Extra}</c>,
+	  where <c>Module:format(Log,Extra)</c> will be called by
+	  the handler to produce the string that will be printed to
+	  the handler's destination.</p></item>
+      <tag><c>level</c></tag>
+      <item>
+	<p>The level of log events that <c>logger</c> shall forward to
+	  this handler. Log events of the specified, or more severe
+	  levels, are forwarded.</p></item>
+    </taglist>
+
+  </description>
+
+<!--  <funcs>
+  </funcs> -->
+
+</erlref>
+
+
diff --git a/lib/kernel/doc/src/part.xml b/lib/kernel/doc/src/part.xml
new file mode 100644
index 0000000000..68eb4530e2
--- /dev/null
+++ b/lib/kernel/doc/src/part.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE part SYSTEM "part.dtd">
+
+<part xmlns:xi="http://www.w3.org/2001/XInclude">
+  <header>
+    <copyright>
+      <year>1996</year><year>2017</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+ 
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+    
+    </legalnotice>
+
+    <title>Logger User's Guide</title>
+    <prepared>OTP Team</prepared>
+    <docno></docno>
+    <date>2017-12-01</date>
+    <rev>0.1</rev>
+    <file>part.xml</file>
+  </header>
+  <description>
+    <p>The System Architecture Support Libraries SASL application
+      provides support for alarm handling, release handling, and
+      related functions.</p>
+  </description>
+  <xi:include href="introduction_chapter.xml"/>
+  <xi:include href="logger_chapter.xml"/>
+</part>
+
diff --git a/lib/kernel/doc/src/ref_man.xml b/lib/kernel/doc/src/ref_man.xml
index 5cd77e0f6f..7f4d5b384f 100644
--- a/lib/kernel/doc/src/ref_man.xml
+++ b/lib/kernel/doc/src/ref_man.xml
@@ -52,6 +52,10 @@
   <xi:include href="inet.xml"/>
   <xi:include href="inet_res.xml"/>
   <xi:include href="init_stub.xml"/>
+  <xi:include href="logger.xml"/>
+  <xi:include href="logger_filters.xml"/>
+  <xi:include href="logger_formatter.xml"/>
+  <xi:include href="logger_std_h.xml"/>
   <xi:include href="net_adm.xml"/>
   <xi:include href="net_kernel.xml"/>
   <xi:include href="os.xml"/>
diff --git a/lib/kernel/doc/src/specs.xml b/lib/kernel/doc/src/specs.xml
index 29d52f23bb..a67e26ef16 100644
--- a/lib/kernel/doc/src/specs.xml
+++ b/lib/kernel/doc/src/specs.xml
@@ -20,6 +20,10 @@
   <xi:include href="../specs/specs_inet.xml"/>
   <xi:include href="../specs/specs_inet_res.xml"/>
   <xi:include href="../specs/specs_init_stub.xml"/>
+  <xi:include href="../specs/specs_logger.xml"/>
+  <xi:include href="../specs/specs_logger_filters.xml"/>
+  <xi:include href="../specs/specs_logger_formatter.xml"/>
+  <xi:include href="../specs/specs_logger_std_h.xml"/>
   <xi:include href="../specs/specs_net_adm.xml"/>
   <xi:include href="../specs/specs_net_kernel.xml"/>
   <xi:include href="../specs/specs_os.xml"/>
diff --git a/lib/kernel/include/logger.hrl b/lib/kernel/include/logger.hrl
new file mode 100644
index 0000000000..2143ccd297
--- /dev/null
+++ b/lib/kernel/include/logger.hrl
@@ -0,0 +1,49 @@
+-ifndef(LOGGER_HRL).
+-define(LOGGER_HRL,true).
+-define(LOG_EMERGENCY(A),?DO_LOG(emergency,[A])).
+-define(LOG_EMERGENCY(A,B),?DO_LOG(emergency,[A,B])).
+-define(LOG_EMERGENCY(A,B,C),?DO_LOG(emergency,[A,B,C])).
+
+-define(LOG_ALERT(A),?DO_LOG(alert,[A])).
+-define(LOG_ALERT(A,B),?DO_LOG(alert,[A,B])).
+-define(LOG_ALERT(A,B,C),?DO_LOG(alert,[A,B,C])).
+
+-define(LOG_CRITICAL(A),?DO_LOG(critical,[A])).
+-define(LOG_CRITICAL(A,B),?DO_LOG(critical,[A,B])).
+-define(LOG_CRITICAL(A,B,C),?DO_LOG(critical,[A,B,C])).
+
+-define(LOG_ERROR(A),?DO_LOG(error,[A])).
+-define(LOG_ERROR(A,B),?DO_LOG(error,[A,B])).
+-define(LOG_ERROR(A,B,C),?DO_LOG(error,[A,B,C])).
+
+-define(LOG_WARNING(A),?DO_LOG(warning,[A])).
+-define(LOG_WARNING(A,B),?DO_LOG(warning,[A,B])).
+-define(LOG_WARNING(A,B,C),?DO_LOG(warning,[A,B,C])).
+
+-define(LOG_NOTICE(A),?DO_LOG(notice,[A])).
+-define(LOG_NOTICE(A,B),?DO_LOG(notice,[A,B])).
+-define(LOG_NOTICE(A,B,C),?DO_LOG(notice,[A,B,C])).
+
+-define(LOG_INFO(A),?DO_LOG(info,[A])).
+-define(LOG_INFO(A,B),?DO_LOG(info,[A,B])).
+-define(LOG_INFO(A,B,C),?DO_LOG(info,[A,B,C])).
+
+-define(LOG_DEBUG(A),?DO_LOG(debug,[A])).
+-define(LOG_DEBUG(A,B),?DO_LOG(debug,[A,B])).
+-define(LOG_DEBUG(A,B,C),?DO_LOG(debug,[A,B,C])).
+
+-define(LOCATION,#{mfa=>{?MODULE,?FUNCTION_NAME,?FUNCTION_ARITY},
+                   line=>?LINE,
+                   file=>?FILE}).
+
+%%%-----------------------------------------------------------------
+%%% Internal, i.e. not intended for direct use in code - use above
+%%% macros instead!
+-define(DO_LOG(Level,Args),
+        case logger:allow(Level,?MODULE) of
+            true ->
+                apply(logger,macro_log,[?LOCATION,Level|Args]);
+            false ->
+                ok
+        end).
+-endif.
diff --git a/lib/kernel/src/Makefile b/lib/kernel/src/Makefile
index 0bc9f121a0..702845512c 100644
--- a/lib/kernel/src/Makefile
+++ b/lib/kernel/src/Makefile
@@ -109,6 +109,17 @@ MODULES = \
 	kernel_refc \
 	local_udp \
 	local_tcp \
+        logger \
+        logger_backend \
+        logger_config \
+        logger_std_h \
+	logger_disk_log_h \
+	logger_h_common \
+	logger_filters \
+        logger_formatter \
+        logger_server \
+        logger_simple \
+        logger_sup \
 	net \
 	net_adm \
 	net_kernel \
@@ -132,13 +143,14 @@ MODULES = \
 
 HRL_FILES= ../include/file.hrl ../include/inet.hrl ../include/inet_sctp.hrl \
 	../include/dist.hrl ../include/dist_util.hrl \
-	../include/net_address.hrl 
+	../include/net_address.hrl ../include/logger.hrl
 
 INTERNAL_HRL_FILES= application_master.hrl disk_log.hrl \
         erl_epmd.hrl hipe_ext_format.hrl \
         inet_dns.hrl inet_res.hrl \
         inet_boot.hrl inet_config.hrl inet_int.hrl \
-	inet_dns_record_adts.hrl
+	inet_dns_record_adts.hrl \
+	logger_internal.hrl logger_h_common.hrl
 
 ERL_FILES= $(MODULES:%=%.erl)
 
@@ -223,7 +235,7 @@ release_docs_spec:
 
 
 # Include dependencies -- list below added by Kostis Sagonas
-$(EBIN)/application_controller.beam: application_master.hrl
+$(EBIN)/application_controller.beam: application_master.hrl ../include/logger.hrl
 $(EBIN)/application_master.beam: application_master.hrl
 $(EBIN)/auth.beam: ../include/file.hrl
 $(EBIN)/code.beam: ../include/file.hrl
@@ -234,6 +246,7 @@ $(EBIN)/disk_log_server.beam: disk_log.hrl
 $(EBIN)/dist_util.beam: ../include/dist_util.hrl ../include/dist.hrl
 $(EBIN)/erl_boot_server.beam: inet_boot.hrl
 $(EBIN)/erl_epmd.beam: inet_int.hrl erl_epmd.hrl
+$(EBIN)/error_logger.beam: logger_internal.hrl ../include/logger.hrl
 $(EBIN)/file.beam: ../include/file.hrl file_int.hrl
 $(EBIN)/file_io_server.beam: ../include/file.hrl file_int.hrl
 $(EBIN)/gen_tcp.beam: inet_int.hrl
@@ -259,6 +272,16 @@ $(EBIN)/inet_udp.beam: inet_int.hrl
 $(EBIN)/inet_sctp.beam: inet_int.hrl ../include/inet_sctp.hrl
 $(EBIN)/local_udp.beam: inet_int.hrl
 $(EBIN)/local_tcp.beam: inet_int.hrl
+$(EBIN)/logger.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_backend.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_config.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_disk_log_h.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
+$(EBIN)/logger_filters.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_formatter.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_server.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_simple.beam: logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_std_h.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
+$(EBIN)/logger_h_common.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl
 $(EBIN)/net_kernel.beam: ../include/net_address.hrl
 $(EBIN)/os.beam: ../include/file.hrl
 $(EBIN)/ram_file.beam: ../include/file.hrl
diff --git a/lib/kernel/src/kernel.app.src b/lib/kernel/src/kernel.app.src
index 82a3571da9..afffcd156e 100644
--- a/lib/kernel/src/kernel.app.src
+++ b/lib/kernel/src/kernel.app.src
@@ -60,6 +60,17 @@
 	     kernel_refc,
 	     local_tcp,
 	     local_udp,
+             logger,
+             logger_backend,
+             logger_config,
+             logger_disk_log_h,
+             logger_filters,
+             logger_formatter,
+             logger_h_common,
+             logger_server,
+             logger_simple,
+             logger_std_h,
+             logger_sup,
 	     net,
 	     net_adm,
 	     net_kernel,
@@ -117,6 +128,8 @@
 		kernel_config,
 		kernel_refc,
 		kernel_sup,
+                logger,
+                logger_sup,
 		net_kernel,
 		net_sup,
 		rex,
@@ -127,7 +140,7 @@
                 inet_db,
                 pg2]},
   {applications, []},
-  {env, [{error_logger, tty}]},
+  {env, []},
   {mod, {kernel, []}},
   {runtime_dependencies, ["erts-10.0", "stdlib-3.5", "sasl-3.0"]}
  ]
diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl
new file mode 100644
index 0000000000..7606912da4
--- /dev/null
+++ b/lib/kernel/src/logger.erl
@@ -0,0 +1,799 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger).
+
+%% Log interface
+-export([emergency/1,emergency/2,emergency/3,
+         alert/1,alert/2,alert/3,
+         critical/1,critical/2,critical/3,
+         error/1,error/2,error/3,
+         warning/1,warning/2,warning/3,
+         notice/1,notice/2,notice/3,
+         info/1,info/2,info/3,
+         debug/1,debug/2,debug/3]).
+-export([log/2,log/3,log/4]).
+
+%% Called by macro
+-export([allow/2,macro_log/3,macro_log/4,macro_log/5,add_default_metadata/1]).
+
+%% Configuration
+-export([add_handler/3, remove_handler/1,
+         add_logger_filter/2, add_handler_filter/3,
+         remove_logger_filter/1, remove_handler_filter/2,
+         set_module_level/2, reset_module_level/1,
+         set_logger_config/1, set_logger_config/2,
+         set_handler_config/2, set_handler_config/3,
+         get_logger_config/0, get_handler_config/1]).
+
+%% Misc
+-export([compare_levels/2]).
+-export([set_process_metadata/1, unset_process_metadata/0,
+         get_process_metadata/0]).
+-export([i/0, i/1]).
+-export([setup_standard_handler/0, replace_simple_handler/3]).
+-export([limit_term/1, get_format_depth/0, get_max_size/0, get_utc_config/0]).
+
+%% Basic report formatting
+-export([format_report/1, format_otp_report/1]).
+
+-export([internal_log/2,filter_stacktrace/2]).
+
+-include("logger_internal.hrl").
+-include("logger.hrl").
+
+%%%-----------------------------------------------------------------
+%%% Types
+-type log() :: #{level=>level(),
+                 msg=>{io:format(),[term()]} |
+                      {report,report()} |
+                      {string,unicode:chardata()},
+                 meta=>metadata()}.
+-type level() :: emergency | alert | critical | error |
+                 warning | notice | info | debug.
+-type report() :: map() | [{atom(),term()}].
+-type msg_fun() :: fun((term()) -> {io:format(),[term()]} |
+                                   report() |
+                                   unicode:chardata()).
+-type metadata() :: map().
+
+-type handler_id() :: atom().
+-type filter_id() :: atom().
+-type filter() :: {fun((log(),term()) -> filter_return()),term()}.
+-type filter_return() :: stop | ignore | log().
+-type config() :: map().
+
+-export_type([log/0,level/0,report/0,msg_fun/0,metadata/0,config/0,handler_id/0,
+              filter_id/0,filter/0,filter_return/0]).
+
+%%%-----------------------------------------------------------------
+%%% API
+emergency(X) ->
+    log(emergency,X).
+emergency(X,Y) ->
+    log(emergency,X,Y).
+emergency(X,Y,Z) ->
+    log(emergency,X,Y,Z).
+
+alert(X) ->
+    log(alert,X).
+alert(X,Y) ->
+    log(alert,X,Y).
+alert(X,Y,Z) ->
+    log(alert,X,Y,Z).
+
+critical(X) ->
+    log(critical,X).
+critical(X,Y) ->
+    log(critical,X,Y).
+critical(X,Y,Z) ->
+    log(critical,X,Y,Z).
+
+error(X) ->
+    log(error,X).
+error(X,Y) ->
+    log(error,X,Y).
+error(X,Y,Z) ->
+    log(error,X,Y,Z).
+
+warning(X) ->
+    log(warning,X).
+warning(X,Y) ->
+    log(warning,X,Y).
+warning(X,Y,Z) ->
+    log(warning,X,Y,Z).
+
+notice(X) ->
+    log(notice,X).
+notice(X,Y) ->
+    log(notice,X,Y).
+notice(X,Y,Z) ->
+    log(notice,X,Y,Z).
+
+info(X) ->
+    log(info,X).
+info(X,Y) ->
+    log(info,X,Y).
+info(X,Y,Z) ->
+    log(info,X,Y,Z).
+
+debug(X) ->
+    log(debug,X).
+debug(X,Y) ->
+    log(debug,X,Y).
+debug(X,Y,Z) ->
+    log(debug,X,Y,Z).
+
+-spec log(Level,StringOrReport) -> ok when
+      Level :: level(),
+      StringOrReport :: unicode:chardata() | report().
+log(Level, StringOrReport) ->
+    do_log(Level,StringOrReport,#{}).
+
+-spec log(Level,StringOrReport,Metadata) -> ok when
+      Level :: level(),
+      StringOrReport :: unicode:chardata() | report(),
+      Metadata :: metadata();
+         (Level,Format,Args) -> ok when
+      Level :: level(),
+      Format :: io:format(),
+      Args ::[term()];
+         (Level,Fun,FunArgs) -> ok when
+      Level :: level(),
+      Fun :: msg_fun(),
+      FunArgs :: term().
+log(Level, StringOrReport, Metadata)
+  when is_map(Metadata), not is_function(StringOrReport) ->
+    do_log(Level,StringOrReport,Metadata);
+log(Level, FunOrFormat, Args) ->
+    do_log(Level,{FunOrFormat,Args},#{}).
+
+-spec log(Level,Format, Args, Metadata) -> ok when
+      Level :: level(),
+      Format :: io:format(),
+      Args :: [term()],
+      Metadata :: metadata();
+         (Level,Fun,FunArgs,Metadata) -> ok when
+      Level :: level(),
+      Fun :: msg_fun(),
+      FunArgs :: term(),
+      Metadata :: metadata().
+log(Level, FunOrFormat, Args, Metadata) ->
+    do_log(Level,{FunOrFormat,Args},Metadata).
+
+-spec allow(Level,Module) -> boolean() when
+      Level :: level(),
+      Module :: module().
+allow(Level,Module) when ?IS_LEVEL(Level), is_atom(Module) ->
+    logger_config:allow(?LOGGER_TABLE,Level,Module).
+
+
+-spec macro_log(Location,Level,StringOrReport)  -> ok when
+      Location :: map(),
+      Level :: level(),
+      StringOrReport :: unicode:chardata() | report().
+macro_log(Location,Level,StringOrReport) ->
+    log_allowed(Location,Level,StringOrReport,#{}).
+
+-spec macro_log(Location,Level,StringOrReport,Meta)  -> ok when
+      Location :: map(),
+      Level :: level(),
+      StringOrReport :: unicode:chardata() | report(),
+      Meta :: metadata();
+               (Location,Level,Format,Args) -> ok when
+      Location :: map(),
+      Level :: level(),
+      Format :: io:format(),
+      Args ::[term()];
+               (Location,Level,Fun,FunArgs) -> ok when
+      Location :: map(),
+      Level :: level(),
+      Fun :: msg_fun(),
+      FunArgs :: term().
+macro_log(Location,Level,StringOrReport,Meta)
+  when is_map(Meta), not is_function(StringOrReport) ->
+    log_allowed(Location,Level,StringOrReport,Meta);
+macro_log(Location,Level,FunOrFormat,Args) ->
+    log_allowed(Location,Level,{FunOrFormat,Args},#{}).
+
+-spec macro_log(Location,Level,Format,Args,Meta)  -> ok when
+      Location :: map(),
+      Level :: level(),
+      Format :: io:format(),
+      Args ::[term()],
+      Meta :: metadata();
+               (Location,Level,Fun,FunArgs,Meta) -> ok when
+      Location :: map(),
+      Level :: level(),
+      Fun :: msg_fun(),
+      FunArgs :: term(),
+      Meta :: metadata().
+macro_log(Location,Level,FunOrFormat,Args,Meta) ->
+    log_allowed(Location,Level,{FunOrFormat,Args},Meta).
+
+-spec format_otp_report(Report) -> FormatArgs when
+      Report :: report(),
+      FormatArgs :: {io:format(),[term()]}.
+format_otp_report(#{label:=_,report:=Report}) ->
+    format_report(Report);
+format_otp_report(Report) ->
+    format_report(Report).
+
+-spec format_report(Report) -> FormatArgs when
+      Report :: report(),
+      FormatArgs :: {io:format(),[term()]}.
+format_report(Report) when is_map(Report) ->
+    format_report(maps:to_list(Report));
+format_report(Report)  when is_list(Report) ->
+    case lists:flatten(Report) of
+        [] ->
+            {"~tp",[[]]};
+        FlatList ->
+            case string_p1(FlatList) of
+                true ->
+                    {"~ts",[FlatList]};
+                false ->
+                    format_term_list(Report,[],[])
+            end
+    end;
+format_report(Report) ->
+    {"~tp",[Report]}.
+
+format_term_list([{Tag,Data}|T],Format,Args) ->
+    PorS = case string_p(Data) of
+               true -> "s";
+               false -> "p"
+           end,
+    format_term_list(T,["    ~tp: ~t"++PorS|Format],[Data,Tag|Args]);
+format_term_list([Data|T],Format,Args) ->
+    format_term_list(T,["    ~tp"|Format],[Data|Args]);
+format_term_list([],Format,Args) ->
+    {lists:flatten(lists:join($\n,lists:reverse(Format))),lists:reverse(Args)}.
+
+string_p(List) when is_list(List) ->
+    string_p1(lists:flatten(List));
+string_p(_) ->
+    false.
+
+string_p1([]) ->
+    false;
+string_p1(FlatList) ->
+    io_lib:printable_unicode_list(FlatList).
+
+internal_log(Level,Term) when is_atom(Level) ->
+    erlang:display_string("Logger - "++ atom_to_list(Level) ++ ": "),
+    erlang:display(Term).
+
+%%%-----------------------------------------------------------------
+%%% Configuration
+-spec add_logger_filter(FilterId,Filter) -> ok | {error,term()} when
+      FilterId :: filter_id(),
+      Filter :: filter().
+add_logger_filter(FilterId,Filter) ->
+    logger_server:add_filter(logger,{FilterId,Filter}).
+
+-spec add_handler_filter(HandlerId,FilterId,Filter) -> ok | {error,term()} when
+      HandlerId :: handler_id(),
+      FilterId :: filter_id(),
+      Filter :: filter().
+add_handler_filter(HandlerId,FilterId,Filter) ->
+    logger_server:add_filter(HandlerId,{FilterId,Filter}).
+
+
+-spec remove_logger_filter(FilterId) -> ok | {error,term()} when
+      FilterId :: filter_id().
+remove_logger_filter(FilterId) ->
+    logger_server:remove_filter(logger,FilterId).
+
+-spec remove_handler_filter(HandlerId,FilterId) -> ok | {error,term()} when
+      HandlerId :: handler_id(),
+      FilterId :: filter_id().
+remove_handler_filter(HandlerId,FilterId) ->
+    logger_server:remove_filter(HandlerId,FilterId).
+
+-spec add_handler(HandlerId,Module,Config) -> ok | {error,term()} when
+      HandlerId :: handler_id(),
+      Module :: module(),
+      Config :: config().
+add_handler(HandlerId,Module,Config) ->
+    logger_server:add_handler(HandlerId,Module,Config).
+
+-spec remove_handler(HandlerId) -> ok | {error,term()} when
+      HandlerId :: handler_id().
+remove_handler(HandlerId) ->
+    logger_server:remove_handler(HandlerId).
+
+-spec set_logger_config(Key,Value) -> ok | {error,term()} when
+      Key :: atom(),
+      Value :: term().
+set_logger_config(Key,Value) ->
+    logger_server:set_config(logger,Key,Value).
+
+-spec set_logger_config(Config) -> ok | {error,term()} when
+      Config :: config().
+set_logger_config(Config) ->
+    logger_server:set_config(logger,Config).
+
+-spec set_handler_config(HandlerId,Key,Value) -> ok | {error,term()} when
+      HandlerId :: handler_id(),
+      Key :: atom(),
+      Value :: term().
+set_handler_config(HandlerId,Key,Value) ->
+    logger_server:set_config(HandlerId,Key,Value).
+
+-spec set_handler_config(HandlerId,Config) -> ok | {error,term()} when
+      HandlerId :: handler_id(),
+      Config :: config().
+set_handler_config(HandlerId,Config) ->
+    logger_server:set_config(HandlerId,Config).
+
+-spec get_logger_config() -> {ok,Config} when
+      Config :: config().
+get_logger_config() ->
+    logger_config:get(?LOGGER_TABLE,logger).
+
+-spec get_handler_config(HandlerId) -> {ok,{Module,Config}} | {error,term()} when
+      HandlerId :: handler_id(),
+      Module :: module(),
+      Config :: config().
+get_handler_config(HandlerId) ->
+    logger_config:get(?LOGGER_TABLE,HandlerId).
+
+-spec set_module_level(Module,Level) -> ok | {error,term()} when
+      Module :: module(),
+      Level :: level().
+set_module_level(Module,Level) ->
+    logger_server:set_module_level(Module,Level).
+
+-spec reset_module_level(Module) -> ok | {error,term()} when
+      Module :: module().
+reset_module_level(Module) ->
+    logger_server:reset_module_level(Module).
+
+%%%-----------------------------------------------------------------
+%%% Misc
+-spec compare_levels(Level1,Level2) -> eq | gt | lt when
+      Level1 :: level(),
+      Level2 :: level().
+compare_levels(Level,Level) when ?IS_LEVEL(Level) ->
+    eq;
+compare_levels(Level1,Level2) when ?IS_LEVEL(Level1), ?IS_LEVEL(Level2) ->
+    Int1 = logger_config:level_to_int(Level1),
+    Int2 = logger_config:level_to_int(Level2),
+    if Int1 < Int2 -> gt;
+       true -> lt
+    end;
+compare_levels(Level1,Level2) ->
+    erlang:error(badarg,[Level1,Level2]).
+
+-spec set_process_metadata(Meta) -> ok when
+      Meta :: metadata().
+set_process_metadata(Meta) when is_map(Meta) ->
+    _ = put(?LOGGER_META_KEY,Meta),
+    ok;
+set_process_metadata(Meta) ->
+    erlang:error(badarg,[Meta]).
+
+-spec get_process_metadata() -> Meta | undefined when
+      Meta :: metadata().
+get_process_metadata() ->
+    get(?LOGGER_META_KEY).
+
+-spec unset_process_metadata() -> ok.
+unset_process_metadata() ->
+    _ = erase(?LOGGER_META_KEY),
+    ok.
+
+-spec i() -> #{logger=>config(),
+               handlers=>[{handler_id(),module(),config()}],
+               module_levels=>[{module(),level()}]}.
+i() ->
+    i(term).
+
+-spec i(term) -> #{logger=>config(),
+                   handlers=>[{handler_id(),module(),config()}],
+                   module_levels=>[{module(),level()}]};
+       (print) -> ok;
+       (string) -> iolist().
+i(_Action = print) ->
+    io:put_chars(i(string));
+i(_Action = string) ->
+    #{logger := #{level := Level, handlers := Handlers,
+                  filters := Filters, filter_default := FilterDefault},
+      handlers := HandlerConfigs,
+      module_levels := Modules} = i(term),
+    [io_lib:format("Current logger configuration:~n", []),
+     io_lib:format("  Level: ~p~n",[Level]),
+     io_lib:format("  Filter Default: ~p~n", [FilterDefault]),
+     io_lib:format("  Filters: ~n", []),
+     print_filters(4, Filters),
+     io_lib:format("  Handlers: ~n", []),
+     print_handlers([C || {Id, _, _} = C <- HandlerConfigs,
+                          lists:member(Id, Handlers)]),
+     io_lib:format("  Level set per module: ~n", []),
+     print_module_levels(Modules)
+    ];
+i(_Action = term) ->
+    {Logger, Handlers, Modules} = logger_config:get(tid()),
+    #{logger=>Logger,
+      handlers=>Handlers,
+      module_levels=>Modules}.
+
+print_filters(Indent, {Id, {Fun, Config}}) ->
+    io_lib:format("~sId: ~p~n"
+                  "~s  Fun:    ~p~n"
+                  "~s  Config: ~p~n",[Indent, Id, Indent, Fun, Indent, Config]);
+print_filters(Indent, Filters) ->
+    IndentStr = io_lib:format("~.*s",[Indent, ""]),
+    lists:map(fun(Filter) ->print_filters(IndentStr, Filter) end, Filters).
+
+
+print_handlers({Id,Module,
+                #{level := Level,
+                  filters := Filters, filter_default := FilterDefault,
+                  formatter := {FormatterModule,FormatterConfig}} = Config}) ->
+    MyKeys = [filter_default, filters, formatter, level, id],
+    UnhandledConfig = maps:filter(fun(Key, _) ->
+                                          not lists:member(Key, MyKeys)
+                                  end, Config),
+    Unhandled = lists:map(fun({Key, Value}) ->
+                                  io_lib:format("        ~p: ~p~n",[Key, Value])
+                          end, maps:to_list(UnhandledConfig)),
+    io_lib:format("    Id: ~p~n"
+                  "      Module:    ~p~n"
+                  "      Level:     ~p~n"
+                  "      Formatter:~n"
+                  "        Module: ~p~n"
+                  "        Config: ~p~n"
+                  "      Filter Default: ~p~n"
+                  "      Filters:~n~s"
+                  "      Handler Config:~n"
+                  "~s"
+                  "",[Id, Module, Level, FormatterModule, FormatterConfig,
+                      FilterDefault, print_filters(8, Filters), Unhandled]);
+print_handlers(Handlers) ->
+    lists:map(fun print_handlers/1, Handlers).
+
+print_module_levels({Module,Level}) ->
+    io_lib:format("    Module: ~p~n"
+                  "      Level: ~p~n",
+                  [Module,Level]);
+print_module_levels(ModuleLevels) ->
+    lists:map(fun print_module_levels/1, ModuleLevels).
+
+-spec setup_standard_handler() -> ok | {error,term()}.
+setup_standard_handler() ->
+    case get_logger_type() of
+        {ok,silent} ->
+            Level = get_logger_level(),
+            ok = set_logger_config(level,Level),
+            remove_handler(logger_simple);
+        {ok,Type} ->
+            Level = get_logger_level(),
+            ok = set_logger_config(level,Level),
+            Filters = get_logger_filters(),
+            setup_standard_handler(Type,#{level=>Level,
+                                          filter_default=>stop,
+                                          filters=>Filters});
+        Error ->
+            Error
+    end.
+
+-spec setup_standard_handler(Type,Config) -> ok | {error,term()} when
+      Type :: tty | standard_io | standard_error | {file,File} |
+              {file,File,Modes} | {disk_log,LogOpts} | false,
+      File :: file:filename(),
+      Modes :: [term()], % [file:mode()], or more specific?
+      Config :: config(),
+      LogOpts :: map().
+setup_standard_handler(false,#{level:=Level,filters:=Filters}) ->
+    case set_handler_config(logger_simple,level,Level) of
+        ok ->
+            set_handler_config(logger_simple,filters,Filters);
+        Error ->
+            Error
+    end;
+setup_standard_handler(Type,Config) ->
+    {Module,TypeConfig} = get_type_config(Type),
+    replace_simple_handler(?STANDARD_HANDLER,
+                           Module,
+                           maps:merge(Config,TypeConfig)).
+
+-spec replace_simple_handler(Id,Module,Config) -> ok | {error,term()} when
+      Id :: handler_id(),
+      Module :: module(),
+      Config :: config().
+replace_simple_handler(Id,Module,Config) ->
+    _ = code:ensure_loaded(Module),
+    DoBuffer = erlang:function_exported(Module,swap_buffer,2),
+    case add_handler(Id,Module,Config#{wait_for_buffer=>DoBuffer}) of
+        ok ->
+            if DoBuffer ->
+                    {ok,Buffered} = logger_simple:get_buffer(),
+                    _ = remove_handler(logger_simple),
+                    Module:swap_buffer(?STANDARD_HANDLER,Buffered);
+               true ->
+                    _ = remove_handler(logger_simple),
+                    ok
+            end,
+            ok;
+        Error ->
+            Error
+    end.
+
+get_logger_type() ->
+    Type0 =
+        case application:get_env(kernel, logger_dest) of
+            undefined ->
+                application:get_env(kernel, error_logger);
+            T ->
+                T
+        end,
+    case Type0 of
+        {ok, tty} ->
+            {ok, tty};
+        {ok, {file, File}} when is_list(File) ->
+            {ok, {file, File}};
+        {ok, {file, File, Modes}} when is_list(File), is_list(Modes) ->
+            {ok, {file, File, Modes}};
+        {ok, {disk_log, File}} when is_list(File) ->
+            {ok, {disk_log, get_disk_log_config(File)}};
+        {ok, false} ->
+            {ok, false};
+        {ok, silent} ->
+            {ok, silent};
+        undefined ->
+            {ok, tty}; % default value
+        {ok, Bad} ->
+            {error,{bad_config, {kernel, {logger_dest, Bad}}}}
+    end.
+
+get_disk_log_config(File) ->
+    Config1 =
+        case application:get_env(kernel,logger_disk_log_maxfiles) of
+            undefined -> #{};
+            {ok,MF} -> #{max_no_files=>MF}
+        end,
+    Config2 =
+        case application:get_env(kernel,logger_disk_log_maxbytes) of
+            undefined -> Config1;
+            {ok,MB} -> Config1#{max_no_bytes=>MB}
+        end,
+    Config3 =
+        case application:get_env(kernel,logger_disk_log_type) of
+            undefined -> Config2;
+            {ok,T} -> Config1#{type=>T}
+        end,
+    Config3#{file=>File}.
+
+get_logger_level() ->
+    case application:get_env(kernel,logger_level) of
+        undefined -> info;
+        {ok,Level} when ?IS_LEVEL(Level) -> Level
+    end.
+
+get_logger_filters() ->
+    case application:get_env(kernel, logger_sasl_compatible, false) of
+        true ->
+            ?DEFAULT_HANDLER_FILTERS([beam,erlang,otp]);
+        false ->
+            Extra =
+                case application:get_env(kernel, logger_log_progress, false) of
+                    true ->
+                        [];
+                    false ->
+                        [{stop_progress,
+                          {fun logger_filters:progress/2,stop}}]
+                end,
+            Extra ++ ?DEFAULT_HANDLER_FILTERS([beam,erlang,otp,sasl])
+    end.
+
+get_type_config({disk_log,LogOpts}) ->
+    {logger_disk_log_h,#{disk_log_opts=>LogOpts}};
+get_type_config(tty) ->
+    %% This is only for backwards compatibility with error_logger and
+    %% old kernel and sasl environment variables
+    get_type_config(standard_io);
+get_type_config(Type) when Type==standard_io;
+                           Type==standard_error;
+                           element(1,Type)==file ->
+    {logger_std_h,#{logger_std_h=>#{type=>Type}}};
+get_type_config(Type) ->
+    {error,{illegal_logger_type,Type}}.
+
+%%%-----------------------------------------------------------------
+-spec limit_term(term()) -> term().
+
+limit_term(Term) ->
+    case get_format_depth() of
+        unlimited -> Term;
+        D -> io_lib:limit_term(Term, D)
+    end.
+
+-spec get_format_depth() -> 'unlimited' | pos_integer().
+
+get_format_depth() ->
+    Depth =
+        case application:get_env(kernel, logger_format_depth) of
+            {ok, D} when is_integer(D) ->
+                D;
+            undefined ->
+                case application:get_env(kernel, error_logger_format_depth) of
+                    {ok, D} when is_integer(D) ->
+                        D;
+                    undefined ->
+                        unlimited
+                end
+        end,
+    max(10, Depth).
+
+-spec get_max_size() -> 'unlimited' | pos_integer().
+
+get_max_size() ->
+    case application:get_env(kernel, logger_max_size) of
+	{ok, Size} when is_integer(Size) ->
+	    max(50, Size);
+	undefined ->
+	    unlimited
+    end.
+
+-spec get_utc_config() -> boolean().
+
+get_utc_config() ->
+    %% Kernel's logger_utc configuration overrides SASL utc_log, which
+    %% in turn overrides stdlib config - in order to have uniform
+    %% timestamps in log messages
+    case application:get_env(kernel, logger_utc) of
+        {ok, Val} -> Val;
+        undefined ->
+            case application:get_env(sasl, utc_log) of
+                {ok, Val} -> Val;
+                undefined ->
+                    case application:get_env(stdlib, utc_log) of
+                        {ok, Val} -> Val;
+                        undefined -> false
+                    end
+            end
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+do_log(warning,Msg,Meta) ->
+    do_log_1(error_logger:warning_map(),Msg,Meta);
+do_log(Level,Msg,Meta) ->
+    do_log_1(Level,Msg,Meta).
+
+do_log_1(Level,Msg,#{mfa:={Module,_,_}}=Meta) ->
+    case logger_config:allow(?LOGGER_TABLE,Level,Module) of
+        true ->
+            log_allowed(#{},Level,Msg,Meta);
+        false ->
+            ok
+    end;
+do_log_1(Level,Msg,Meta) ->
+    case logger_config:allow(?LOGGER_TABLE,Level) of
+        true ->
+            log_allowed(#{},Level,Msg,Meta);
+        false ->
+            ok
+    end.
+
+-spec log_allowed(Location,Level,Msg,Meta)  -> ok when
+      Location :: map(),
+      Level :: level(),
+      Msg :: {msg_fun(),term()} |
+             {io:format(),[term()]} |
+             report() |
+             unicode:chardata(),
+      Meta :: metadata().
+log_allowed(Location,Level,{Fun,FunArgs},Meta) when is_function(Fun,1) ->
+    try Fun(FunArgs) of
+        Msg={Format,Args} when is_list(Format), is_list(Args) ->
+            log_allowed(Location,Level,Msg,Meta);
+        Report when ?IS_REPORT(Report) ->
+            log_allowed(Location,Level,Report,Meta);
+        String when ?IS_STRING(String) ->
+            log_allowed(Location,Level,String,Meta);
+        Other ->
+            log_allowed(Location,Level,
+                        {"LAZY_FUN ERROR: ~tp; Returned: ~tp",
+                         [{Fun,FunArgs},Other]},
+                        Meta)
+    catch C:R ->
+            log_allowed(Location,Level,
+                        {"LAZY_FUN CRASH: ~tp; Reason: ~tp",
+                         [{Fun,FunArgs},{C,R}]},
+                        Meta)
+    end;
+log_allowed(Location,Level,Msg,Meta0) when is_map(Meta0) ->
+    %% Metadata priorities are:
+    %% Location (added in API macros) - will be overwritten by process
+    %% metadata (set by set_process_metadata/1), which in turn will be
+    %% overwritten by the metadata given as argument in the log call
+    %% (function or macro).
+    Meta = add_default_metadata(
+             maps:merge(Location,maps:merge(proc_meta(),Meta0))),
+    case node(maps:get(gl,Meta)) of
+        Node when Node=/=node() ->
+            log_remote(Node,Level,Msg,Meta),
+            do_log_allowed(Level,Msg,Meta);
+        _ ->
+            do_log_allowed(Level,Msg,Meta)
+    end.
+
+do_log_allowed(Level,{Format,Args}=Msg,Meta)
+  when ?IS_LEVEL(Level),
+       is_list(Format),
+       is_list(Args),
+       is_map(Meta) ->
+    logger_backend:log_allowed(#{level=>Level,msg=>Msg,meta=>Meta},tid());
+do_log_allowed(Level,Report,Meta)
+  when ?IS_LEVEL(Level),
+       ?IS_REPORT(Report),
+       is_map(Meta) ->
+    logger_backend:log_allowed(#{level=>Level,msg=>{report,Report},meta=>Meta},
+                               tid());
+do_log_allowed(Level,String,Meta)
+  when ?IS_LEVEL(Level),
+       ?IS_STRING(String),
+       is_map(Meta) ->
+    logger_backend:log_allowed(#{level=>Level,msg=>{string,String},meta=>Meta},
+                               tid()).
+tid() ->
+    ets:whereis(?LOGGER_TABLE).
+
+log_remote(Node,Level,{Format,Args},Meta) ->
+    log_remote(Node,{log,Level,Format,Args,Meta});
+log_remote(Node,Level,Msg,Meta) ->
+    log_remote(Node,{log,Level,Msg,Meta}).
+
+log_remote(Node,Request) ->
+    {logger,Node} ! Request,
+    ok.
+
+add_default_metadata(Meta) ->
+    add_default_metadata([pid,gl,time],Meta).
+
+add_default_metadata([Key|Keys],Meta) ->
+    case maps:is_key(Key,Meta) of
+        true ->
+            add_default_metadata(Keys,Meta);
+        false ->
+            add_default_metadata(Keys,Meta#{Key=>default(Key)})
+    end;
+add_default_metadata([],Meta) ->
+    Meta.
+
+proc_meta() ->
+    case get_process_metadata() of
+        ProcMeta when is_map(ProcMeta) -> ProcMeta;
+        _ -> #{}
+    end.
+
+default(pid) -> self();
+default(gl) -> group_leader();
+default(time) -> erlang:monotonic_time(microsecond).
+
+%% Remove everything upto and including this module from the stacktrace
+filter_stacktrace(Module,[{Module,_,_,_}|_]) ->
+    [];
+filter_stacktrace(Module,[H|T]) ->
+    [H|filter_stacktrace(Module,T)];
+filter_stacktrace(_,[]) ->
+    [].
diff --git a/lib/kernel/src/logger_backend.erl b/lib/kernel/src/logger_backend.erl
new file mode 100644
index 0000000000..d9f5aa6faf
--- /dev/null
+++ b/lib/kernel/src/logger_backend.erl
@@ -0,0 +1,133 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_backend).
+
+-export([log_allowed/2]).
+
+-include("logger_internal.hrl").
+
+-define(OWN_KEYS,[level,filters,filter_default,handlers]).
+
+%%%-----------------------------------------------------------------
+%%% The default logger backend
+log_allowed(Log, Tid) ->
+    {ok,Config} = logger_config:get(Tid,logger),
+    Filters = maps:get(filters,Config,[]),
+    case apply_filters(logger,Log,Filters,Config) of
+        stop ->
+            ok;
+        Log1 ->
+            Handlers = maps:get(handlers,Config,[]),
+            call_handlers(Log1,Handlers,Tid)
+    end,
+    ok.
+
+call_handlers(#{level:=Level}=Log,[Id|Handlers],Tid) ->
+    case logger_config:get(Tid,Id,Level) of
+        {ok,{Module,Config}} ->
+            Filters = maps:get(filters,Config,[]),
+            case apply_filters(Id,Log,Filters,Config) of
+                stop ->
+                    ok;
+                Log1 ->
+                    Config1 = maps:without(?OWN_KEYS,Config),
+                    try Module:log(Log1,Config1)
+                    catch C:R:S ->
+                            case logger:remove_handler(Id) of
+                                ok ->
+                                    logger:internal_log(
+                                      error,{removed_failing_handler,Id}),
+                                    ?LOG_INTERNAL(
+                                       debug,
+                                       [{logger,removed_failing_handler},
+                                        {handler,{Id,Module}},
+                                        {log,Log1},
+                                        {config,Config1},
+                                        {reason,{C,R,filter_stacktrace(S)}}]);
+                                {error,{not_found,_}} ->
+                                    %% Probably already removed by other client
+                                    %% Don't report again
+                                    ok;
+                                {error,Reason} ->
+                                    ?LOG_INTERNAL(
+                                       debug,
+                                       [{logger,remove_handler_failed},
+                                        {reason,Reason}])
+                            end
+                    end
+            end;
+        _ ->
+            ok
+    end,
+    call_handlers(Log,Handlers,Tid);
+call_handlers(_Log,[],_Tid) ->
+    ok.
+
+apply_filters(Owner,Log,Filters,Config) ->
+    case do_apply_filters(Owner,Log,Filters,ignore) of
+        stop ->
+            stop;
+        ignore ->
+            case maps:get(filter_default,Config) of
+                log ->
+                    Log;
+                stop ->
+                    stop
+            end;
+        Log1 ->
+            Log1
+    end.
+
+do_apply_filters(Owner,Log,[{_Id,{FilterFun,FilterArgs}}=Filter|Filters],State) ->
+    try FilterFun(Log,FilterArgs) of
+        stop ->
+            stop;
+        ignore ->
+            do_apply_filters(Owner,Log,Filters,State);
+        Log1=#{level:=Level,msg:=Msg,meta:=Meta}
+          when is_atom(Level), ?IS_MSG(Msg), is_map(Meta) ->
+            do_apply_filters(Owner,Log1,Filters,log);
+        Bad ->
+            handle_filter_failed(Filter,Owner,Log,{bad_return_value,Bad})
+    catch C:R:S ->
+            handle_filter_failed(Filter,Owner,Log,{C,R,filter_stacktrace(S)})
+    end;
+do_apply_filters(_Owner,_Log,[],ignore) ->
+    ignore;
+do_apply_filters(_Owner,Log,[],log) ->
+    Log.
+
+handle_filter_failed({Id,_}=Filter,Owner,Log,Reason) ->
+    case logger_server:remove_filter(Owner,Id) of
+        ok ->
+            logger:internal_log(error,{removed_failing_filter,Id}),
+            ?LOG_INTERNAL(debug,
+                          [{logger,removed_failing_filter},
+                           {filter,Filter},
+                           {owner,Owner},
+                           {log,Log},
+                           {reason,Reason}]);
+        _ ->
+            ok
+    end,
+    ignore.
+
+filter_stacktrace(Stacktrace) ->
+    logger:filter_stacktrace(?MODULE,Stacktrace).
diff --git a/lib/kernel/src/logger_config.erl b/lib/kernel/src/logger_config.erl
new file mode 100644
index 0000000000..799aea9617
--- /dev/null
+++ b/lib/kernel/src/logger_config.erl
@@ -0,0 +1,151 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_config).
+
+-export([new/1,delete/2,
+         exist/2,
+         allow/2,allow/3,
+         get/2, get/3, get/1,
+         create/3, create/4, set/3,
+         set_module_level/3,reset_module_level/2,
+         cache_module_level/2,
+         level_to_int/1]).
+
+-include("logger_internal.hrl").
+
+new(Name) ->
+    _ = ets:new(Name,[set,protected,named_table]),
+    ets:whereis(Name).
+
+delete(Tid,Id) ->
+    ets:delete(Tid,table_key(Id)).
+
+allow(Tid,Level,Module) ->
+    LevelInt = level_to_int(Level),
+    case ets:lookup(Tid,Module) of
+        [{Module,{ModLevel,cached}}] when is_integer(ModLevel),
+                                          LevelInt =< ModLevel ->
+            true;
+        [{Module,ModLevel}] when is_integer(ModLevel),
+                                 LevelInt =< ModLevel ->
+            true;
+        [] ->
+            logger_server:cache_module_level(Module),
+            allow(Tid,Level);
+        _ ->
+            false
+    end.
+
+allow(Tid,Level) ->
+    GlobalLevelInt = ets:lookup_element(Tid,?LOGGER_KEY,2),
+    level_to_int(Level) =< GlobalLevelInt.
+
+exist(Tid,What) ->
+    ets:member(Tid,table_key(What)).
+
+get(Tid,What) ->
+    case ets:lookup(Tid,table_key(What)) of
+        [{_,_,Config}] ->
+            {ok,Config};
+        [{_,_,Config,Module}] ->
+            {ok,{Module,Config}};
+        [] ->
+            {error,{not_found,What}}
+    end.
+
+get(Tid,What,Level) ->
+    MS = [{{table_key(What),'$1','$2'}, % logger config
+           [{'>=','$1',level_to_int(Level)}],
+           ['$2']},
+          {{table_key(What),'$1','$2','$3'}, % handler config
+           [{'>=','$1',level_to_int(Level)}],
+           [{{'$3','$2'}}]}],
+    case ets:select(Tid,MS) of
+        [] -> error;
+        [Data] -> {ok,Data}
+    end.
+
+create(Tid,What,Module,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    ets:insert(Tid,{table_key(What),LevelInt,Config,Module}).
+create(Tid,What,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    ets:insert(Tid,{table_key(What),LevelInt,Config}).
+
+set(Tid,What,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    %% Should do this only if the level has actually changed. Possibly
+    %% overwrite instead of delete?
+    case What of
+        logger ->
+            _ = ets:select_delete(Tid,[{{'_',{'$1',cached}},
+                                        [{'=/=','$1',LevelInt}],
+                                        [true]}]),
+            ok;
+        _ ->
+            ok
+    end,
+    ets:update_element(Tid,table_key(What),[{2,LevelInt},{3,Config}]),
+    ok.
+
+set_module_level(Tid,Module,Level) ->
+    ets:insert(Tid,{Module,level_to_int(Level)}),
+    ok.
+
+reset_module_level(Tid,Module) ->
+    ets:delete(Tid,Module), % should possibley overwrite instead of delete?
+    ok.
+
+cache_module_level(Tid,Module) ->
+    GlobalLevelInt = ets:lookup_element(Tid,?LOGGER_KEY,2),
+    ets:insert_new(Tid,{Module,{GlobalLevelInt,cached}}),
+    ok.
+
+get(Tid) ->
+    {ok,Logger} = get(Tid,logger),
+    HMS = [{{table_key('$1'),'_','$2','$3'},[],[{{'$1','$3','$2'}}]}],
+    Handlers = ets:select(Tid,HMS),
+    MMS = [{{'$1','$2'},[{is_atom,'$1'},{is_integer,'$2'}],[{{'$1','$2'}}]}],
+    Modules = ets:select(Tid,MMS),
+    {Logger,Handlers,[{M,int_to_level(L)} || {M,L} <- Modules]}.
+
+level_to_int(emergency) -> ?EMERGENCY;
+level_to_int(alert) -> ?ALERT;
+level_to_int(critical) -> ?CRITICAL;
+level_to_int(error) -> ?ERROR;
+level_to_int(warning) -> ?WARNING;
+level_to_int(notice) -> ?NOTICE;
+level_to_int(info) -> ?INFO;
+level_to_int(debug) -> ?DEBUG.
+
+int_to_level(?EMERGENCY) -> emergency;
+int_to_level(?ALERT) -> alert;
+int_to_level(?CRITICAL) -> critical;
+int_to_level(?ERROR) -> error;
+int_to_level(?WARNING) -> warning;
+int_to_level(?NOTICE) -> notice;
+int_to_level(?INFO) -> info;
+int_to_level(?DEBUG) -> debug.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+
+table_key(logger) -> ?LOGGER_KEY;
+table_key(HandlerId) -> {?HANDLER_KEY,HandlerId}.
diff --git a/lib/kernel/src/logger_disk_log_h.erl b/lib/kernel/src/logger_disk_log_h.erl
new file mode 100644
index 0000000000..3b71f936d8
--- /dev/null
+++ b/lib/kernel/src/logger_disk_log_h.erl
@@ -0,0 +1,694 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_disk_log_h).
+
+-behaviour(gen_server).
+
+-include("logger.hrl").
+-include("logger_internal.hrl").
+-include("logger_h_common.hrl").
+
+%%% API
+-export([start_link/3, info/1, disk_log_sync/1, reset/1]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+         terminate/2, code_change/3]).
+
+%% logger callbacks
+-export([log/2,
+         adding_handler/2, removing_handler/1,
+         changing_config/3, swap_buffer/2]).
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+
+%%%-----------------------------------------------------------------
+%%% Start a disk_log handler process and link to caller.
+%%% This function is called by the kernel supervisor when this
+%%% handler process gets added (as a result of calling add/3).
+-spec start_link(Name, Config, HandlerState) -> {ok,Pid} | {error,Reason} when
+      Name :: atom(),
+      Config :: logger:config(),
+      HandlerState :: map(),
+      Pid :: pid(),
+      Reason :: term().
+
+start_link(Name, Config, HandlerState) ->
+    proc_lib:start_link(?MODULE,init,[[Name,Config,HandlerState]]).
+
+%%%-----------------------------------------------------------------
+%%%
+-spec disk_log_sync(Name) -> ok | {error,Reason} when
+      Name :: atom(),
+      Reason :: handler_busy | {badarg,term()}.
+
+disk_log_sync(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, disk_log_sync, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;
+disk_log_sync(Name) ->
+    {error,{badarg,{disk_log_sync,[Name]}}}.
+
+%%%-----------------------------------------------------------------
+%%%
+-spec info(Name) -> Info | {error,Reason} when
+      Name :: atom(),
+      Info :: term(),
+      Reason :: handler_busy | {badarg,term()}.
+
+info(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, info, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;
+info(Name) ->
+    {error,{badarg,{info,[Name]}}}.
+
+%%%-----------------------------------------------------------------
+%%%
+-spec reset(Name) -> ok | {error,Reason} when
+      Name :: atom(),
+      Reason :: handler_busy | {badarg,term()}.
+
+reset(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, reset, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;      
+reset(Name) ->
+    {error,{badarg,{reset,[Name]}}}.
+
+
+%%%===================================================================
+%%% logger callbacks
+%%%===================================================================
+
+%%%-----------------------------------------------------------------
+%%% Handler being added
+adding_handler(Name, Config) ->
+    case check_config(adding, Name, Config) of
+        {ok, Config1} ->
+            %% create initial handler state by merging defaults with config
+            HConfig = maps:get(?MODULE, Config1, #{}),
+            HState = maps:merge(get_init_state(), HConfig),
+            case logger_h_common:overload_levels_ok(HState) of
+                true ->
+                    case start(Name, Config1, HState) of
+                        ok ->
+                            %% Make sure wait_for_buffer is not stored, so we
+                            %% won't hang and wait for buffer on a restart
+                            {ok, maps:remove(wait_for_buffer,Config1)};
+                        Error ->
+                            Error
+                    end;
+                false ->
+                    #{toggle_sync_qlen   := TSQL,
+                      drop_new_reqs_qlen := DNRQL,
+                      flush_reqs_qlen    := FRQL} = HState, 
+                    {error,{invalid_levels,{TSQL,DNRQL,FRQL}}}
+            end;
+        Error ->
+            Error
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Updating handler config
+changing_config(Name,
+                OldConfig=#{id:=Id, disk_log_opts:=DLOpts},
+                NewConfig=#{id:=Id, disk_log_opts:=DLOpts}) ->
+    case check_config(changing, Name, NewConfig) of
+        Result = {ok,NewConfig1} ->
+            try gen_server:call(Name, {change_config,OldConfig,NewConfig1},
+                                ?DEFAULT_CALL_TIMEOUT) of
+                ok      -> Result;
+                HError  -> HError
+            catch
+                _:{timeout,_} -> {error,handler_busy}
+            end;
+        Error ->
+            Error
+    end;
+changing_config(_Name, OldConfig, NewConfig) ->
+    {error,{illegal_config_change,OldConfig,NewConfig}}.
+
+check_config(adding, Name, Config0) ->
+    %% Merge in defaults on top level
+    Config = maps:merge(#{id => Name}, Config0),
+    %% Merge in defaults on handler level
+    LogOpts0 = maps:get(disk_log_opts, Config, #{}),
+    LogOpts = merge_default_logopts(Name, LogOpts0),
+    case check_log_opts(maps:to_list(LogOpts)) of
+        ok ->
+            MyConfig = maps:get(?MODULE, Config, #{}),
+            case check_my_config(maps:to_list(MyConfig)) of
+                ok ->
+                    {ok,Config#{disk_log_opts=>LogOpts,
+                                ?MODULE=>MyConfig}};
+                Error ->
+                    Error
+            end;
+        Error ->
+            Error
+    end;
+check_config(changing, _Name, Config) ->
+    MyConfig = maps:get(?MODULE, Config, #{}),
+    case check_my_config(maps:to_list(MyConfig)) of
+        ok    -> {ok,Config};
+        Error -> Error
+    end.
+
+merge_default_logopts(Name, LogOpts) ->
+    Type = maps:get(type, LogOpts, wrap),
+    {DefaultNoFiles,DefaultNoBytes} =
+        case Type of
+            halt -> {undefined,infinity};
+            _wrap -> {10,1048576}
+        end,
+    {ok,Dir} = file:get_cwd(),
+    Default = #{file => filename:join(Dir,Name),
+                max_no_files => DefaultNoFiles,
+                max_no_bytes => DefaultNoBytes,
+                type => Type},
+    maps:merge(Default,LogOpts).
+
+check_log_opts([{file,File}|Opts]) when is_list(File) ->
+    check_log_opts(Opts);
+check_log_opts([{max_no_files,undefined}|Opts]) ->
+    check_log_opts(Opts);
+check_log_opts([{max_no_files,N}|Opts]) when is_integer(N), N>0 ->
+    check_log_opts(Opts);
+check_log_opts([{max_no_bytes,infinity}|Opts]) ->
+    check_log_opts(Opts);
+check_log_opts([{max_no_bytes,N}|Opts]) when is_integer(N), N>0 ->
+    check_log_opts(Opts);
+check_log_opts([{type,Type}|Opts]) when Type==wrap; Type==halt ->
+    check_log_opts(Opts);
+check_log_opts([Invalid|_]) ->
+    {error,{invalid_config,disk_log_opt,Invalid}};
+check_log_opts([]) ->
+    ok.
+
+check_my_config([Other | Config]) ->
+    case logger_h_common:check_common_config(Other) of
+        valid ->
+            check_my_config(Config);
+        invalid ->
+            {error,{invalid_config,?MODULE,Other}}
+    end;
+check_my_config([]) ->
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Handler being removed
+removing_handler(Name) ->
+    stop(Name).
+
+%%%-----------------------------------------------------------------
+%%% Get buffer when swapping from simple handler
+swap_buffer(Name,Buffer) ->
+    case whereis(Name) of
+        undefined ->
+            ok;
+        _ ->
+            Name ! {buffer,Buffer}
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Log a string or report
+-spec log(Log, Config) -> ok | dropped when
+      Log :: logger:log(),
+      Config :: logger:config().
+
+log(Log,Config=#{id:=Name}) ->
+    %% if the handler has crashed, we must drop this request
+    %% and hope the handler restarts so we can try again
+    true = is_pid(whereis(Name)),
+    Bin = logger_h_common:log_to_binary(Log,Config),
+    logger_h_common:call_cast_or_drop(Name, Bin).
+
+
+%%%===================================================================
+%%% gen_server callbacks
+%%%===================================================================
+
+init([Name, Config = #{disk_log_opts := LogOpts},
+      State = #{dl_sync_int := DLSyncInt}]) ->
+    register(Name, self()),
+    process_flag(trap_exit, true),
+    process_flag(message_queue_data, off_heap),
+
+    ?init_test_hooks(),
+    ?start_observation(Name),
+
+    case open_disk_log(Name, LogOpts) of
+        ok ->
+            catch ets:new(Name, [public, named_table]),
+            ?set_mode(Name, async),
+            proc_lib:init_ack({ok,self()}),
+            T0 = ?timestamp(),
+            State1 =
+                ?merge_with_stats(State#{id => Name,
+                                         mode => async,
+                                         dl_sync => DLSyncInt,
+                                         log_opts => LogOpts,
+                                         last_qlen => 0,
+                                         last_log_ts => T0,
+                                         burst_win_ts => T0,
+                                         burst_msg_count => 0,
+                                         prev_log_result => ok,
+                                         prev_sync_result => ok,
+                                         prev_disk_log_info => undefined}),
+            gen_server:cast(self(), {repeated_disk_log_sync,T0}),
+            enter_loop(Config, State1);
+        Error ->
+            logger_h_common:error_notify({open_disk_log,Name,Error}),
+            proc_lib:init_ack(Error)
+    end.
+
+enter_loop(#{wait_for_buffer:=true}=Config,State) ->
+    State1 =
+        receive
+            {buffer,Buffer} ->
+                lists:foldl(
+                  fun(Log,S) ->
+                          Bin = logger_h_common:log_to_binary(Log,Config),
+                          {_,S1} = do_log(Bin,cast,S),
+                          S1
+                  end,
+                  State,
+                  Buffer)
+        end,
+    gen_server:enter_loop(?MODULE,[],State1);
+enter_loop(_Config,State) ->
+    gen_server:enter_loop(?MODULE,[],State).
+
+%% This is the synchronous log request.
+handle_call({log, Bin}, _From, State) ->
+    {Result,State1} = do_log(Bin, call, State),
+    %% Result == ok | dropped
+    {reply, Result, State1};
+
+handle_call(disk_log_sync, _From, State = #{id := Name}) ->
+    State1 = #{prev_sync_result := Result} = disk_log_sync(Name, State),
+    {reply, Result, State1};
+
+handle_call({change_config,_OldConfig,NewConfig}, _From,
+            State = #{filesync_repeat_interval := FSyncInt0,
+                      last_log_ts := LastLogTS}) ->
+    HConfig = maps:get(?MODULE, NewConfig, #{}),
+    State1 = #{toggle_sync_qlen   := TSQL,
+               drop_new_reqs_qlen := DNRQL,
+               flush_reqs_qlen    := FRQL} = maps:merge(State, HConfig),
+    case logger_h_common:overload_levels_ok(State1) of
+        true ->
+            _ = 
+                case maps:get(filesync_repeat_interval, HConfig, undefined) of
+                    undefined ->
+                        ok;
+                    no_repeat ->
+                        _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref,
+                                                                  State,
+                                                                  undefined));
+                    FSyncInt0 ->
+                        ok;
+                    _FSyncInt1 ->
+                        _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref,
+                                                                  State,
+                                                                  undefined)),
+                        _ = gen_server:cast(self(), {repeated_disk_log_sync,
+                                                     LastLogTS})
+                end,            
+            {reply, ok, State1};
+        false ->
+            {reply, {error,{invalid_levels,{TSQL,DNRQL,FRQL}}}, State}
+    end;
+
+handle_call(info, _From, State) ->
+    {reply, State, State};
+
+handle_call(reset, _From, State) ->
+    State1 = ?merge_with_stats(State),
+    {reply, ok, State1#{last_qlen => 0,
+                        last_log_ts => ?timestamp(),
+                        prev_log_result => ok,
+                        prev_sync_result => ok,
+                        prev_disk_log_info => undefined}};
+
+handle_call(stop, _From, State) ->
+    {stop, {shutdown,stopped}, ok, State}.
+
+
+%% This is the asynchronous log request.
+handle_cast({log, Bin}, State) ->
+    {_,State1} = do_log(Bin, cast, State),
+    {noreply, State1};
+
+%% If FILESYNC_REPEAT_INTERVAL is set to a millisec value, this
+%% clause gets called repeatedly by the handler. In order to
+%% guarantee that a filesync *always* happens after the last log
+%% request, the repeat operation must be active!
+handle_cast({repeated_disk_log_sync,LastLogTS0},
+            State = #{id := Name,
+                      filesync_repeat_interval := FSyncInt,
+                      last_log_ts := LastLogTS1}) ->
+    State1 =
+        if is_integer(FSyncInt) ->
+                %% only do filesync if something has been
+                %% written since last time we checked
+                NewState = if LastLogTS1 == LastLogTS0 ->
+                                   State;
+                              true ->
+                                   disk_log_sync(Name, State)
+                           end,
+                {ok,TRef} =
+                    timer:apply_after(FSyncInt, gen_server,cast,
+                                      [self(),
+                                       {repeated_disk_log_sync,LastLogTS1}]),
+                NewState#{rep_sync_tref => TRef};
+           true ->
+                State
+        end,
+    {noreply,State1}.
+
+%% The disk log owner must handle status messages from disk_log.
+handle_info({disk_log, _Node, _Log, {wrap,_NoLostItems}}, State) ->
+    {noreply, State};
+handle_info({disk_log, _Node, Log, Info = {truncated,_NoLostItems}},
+            State = #{id := Name, prev_disk_log_info := PrevInfo}) ->
+    error_notify_new(Info, PrevInfo, {disk_log,Name,Log,Info}),
+    {noreply, State#{prev_disk_log_info => Info}};
+handle_info({disk_log, _Node, Log, Info = {blocked_log,_Items}},
+            State = #{id := Name, prev_disk_log_info := PrevInfo}) ->
+    error_notify_new(Info, PrevInfo, {disk_log,Name,Log,Info}),
+    {noreply, State#{prev_disk_log_info => Info}};
+handle_info({disk_log, _Node, Log, full},
+            State = #{id := Name, prev_disk_log_info := PrevInfo}) ->
+    error_notify_new(full, PrevInfo, {disk_log,Name,Log,full}),
+    {noreply, State#{prev_disk_log_info => full}};
+handle_info({disk_log, _Node, Log, Info = {error_status,_Status}},
+            State = #{id := Name, prev_disk_log_info := PrevInfo}) ->
+    error_notify_new(Info, PrevInfo, {disk_log,Name,Log,Info}),
+    {noreply, State#{prev_disk_log_info => Info}};
+
+handle_info({'EXIT',_Pid,_Why}, State = #{id := _Name}) ->
+    {noreply, State};
+
+handle_info(_, State) ->
+    {noreply, State}.
+
+terminate(Reason, State = #{id := Name}) ->
+    _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref, State,
+                                              undefined)),
+    _ = close_disk_log(Name, normal),
+    logger_h_common:stop_or_restart(Name, Reason, State).
+
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+%%%-----------------------------------------------------------------
+%%% Internal functions
+
+%%%-----------------------------------------------------------------
+%%%
+get_init_state() ->
+     #{toggle_sync_qlen           => ?TOGGLE_SYNC_QLEN,
+       drop_new_reqs_qlen         => ?DROP_NEW_REQS_QLEN,
+       flush_reqs_qlen            => ?FLUSH_REQS_QLEN,
+       enable_burst_limit         => ?ENABLE_BURST_LIMIT,
+       burst_limit_size           => ?BURST_LIMIT_SIZE,
+       burst_window_time          => ?BURST_WINDOW_TIME,
+       enable_kill_overloaded     => ?ENABLE_KILL_OVERLOADED,
+       handler_overloaded_qlen    => ?HANDLER_OVERLOADED_QLEN,
+       handler_overloaded_mem     => ?HANDLER_OVERLOADED_MEM,
+       handler_restart_after      => ?HANDLER_RESTART_AFTER,
+       dl_sync_int                => ?CONTROLLER_SYNC_INTERVAL,
+       filesync_ok_qlen           => ?FILESYNC_OK_QLEN,
+       filesync_repeat_interval   => ?FILESYNC_REPEAT_INTERVAL}.
+
+%%%-----------------------------------------------------------------
+%%% Add a disk_log handler to the logger.
+%%% This starts a dedicated handler process which should always
+%%% exist if the handler is registered with logger (and should not
+%%% exist if the handler is not registered).
+%%%
+%%% Config is the logger:config() map containing a sub map with any of
+%%% the following associations:
+%%%
+%%% Config = #{disk_log_opts => #{file          => file:filename(),
+%%%                               max_no_bytes  => integer(),
+%%%                               max_no_files  => integer(),
+%%%                               type          => wrap | halt}}.
+%%%
+%%% This map will be merged with the logger configuration data for
+%%% the disk_log LogName. If type == halt, then max_no_files is
+%%% ignored.
+%%%
+%%% Handler specific config should be provided with a sub map associated
+%%% with a key named the same as this module, e.g:
+%%%
+%%% Config = #{logger_disk_log_h => #{toggle_sync_qlen => 50}
+%%%
+%%% The disk_log handler process is linked to logger_sup, which is
+%%% part of the kernel application's supervision tree.
+start(Name, Config, HandlerState) ->
+    LoggerDLH =
+        #{id       => Name,
+          start    => {?MODULE, start_link, [Name,Config,HandlerState]},
+          restart  => temporary,
+          shutdown => 2000,
+          type     => worker,
+          modules  => [?MODULE]},
+    case supervisor:start_child(logger_sup, LoggerDLH) of
+        {ok,_} ->
+            ok;
+        Error ->
+            Error
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Stop and remove the handler.
+stop(Name) ->
+    case whereis(Name) of
+        undefined ->
+            ok;
+        _ ->
+            %% We don't want to do supervisor:terminate_child here
+            %% since we need to distinguish this explicit stop from a
+            %% system termination in order to avoid circular attempts
+            %% at removing the handler (implying deadlocks and
+            %% timeouts).
+            _ = gen_server:call(Name,stop),
+            _ = supervisor:delete_child(logger_sup, Name),
+            ok
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Logging and overload control.
+-define(update_dl_sync(C, Interval),
+        if C == 0 -> Interval;
+           true -> C-1 end).
+
+%% check for overload between every request (and set Mode to async,
+%% sync or drop accordingly), but never flush the whole mailbox
+%% before LogWindowSize requests have been handled
+do_log(Bin, CallOrCast, State = #{id:=Name, mode := _Mode0}) ->
+    T1 = ?timestamp(),
+
+    %% check if the handler is getting overloaded, or if it's
+    %% recovering from overload (the check must be done for each
+    %% request to react quickly to large bursts of requests and
+    %% to ensure that the handler can never end up in drop mode
+    %% with an empty mailbox, which would stop operation)
+    {Mode1,QLen,Mem,State1} = logger_h_common:check_load(State),
+
+    %% kill the handler if it can't keep up with the load
+    logger_h_common:kill_if_choked(Name, QLen, Mem, State),
+
+    if Mode1 == flush ->            
+            flush(Name, QLen, T1, State1);
+       true ->
+            write(Name, Mode1, T1, Bin, CallOrCast, State1)
+    end.
+
+%% this function is called by do_log/3 after an overload check
+%% has been performed, where QLen > FlushQLen
+flush(Name, _QLen0, T1, State=#{last_log_ts := _T0}) ->
+    %% flush messages in the mailbox (a limited number in
+    %% order to not cause long delays)
+    _NewFlushed = logger_h_common:flush_log_requests(?FLUSH_MAX_N),
+
+    %% because of the receive loop when flushing messages, the
+    %% handler will be scheduled out often and the mailbox could
+    %% grow very large, so we'd better check the queue again here
+    {_,_QLen1} = process_info(self(), message_queue_len),
+    ?observe(Name,{max_qlen,_QLen1}),
+
+    %% Add 1 for the current log request
+    ?observe(Name,{flushed,_NewFlushed+1}),
+
+    State1 = ?update_max_time(?diff_time(T1,_T0),State),
+    {dropped,?update_other(flushed,FLUSHED,_NewFlushed,
+                           State1#{mode => ?set_mode(Name,async),
+                                   last_qlen => 0,
+                                   last_log_ts => T1})}.
+
+%% this function is called to write to disk_log
+write(Name, Mode, T1, Bin, _CallOrCast,
+      State = #{dl_sync := DLSync,
+                dl_sync_int := DLSyncInt,
+                last_qlen := LastQLen,
+                last_log_ts := T0}) ->
+    %% check if we need to limit the number of writes
+    %% during a burst of log requests
+    {DoWrite,BurstWinT,BurstMsgCount} = logger_h_common:limit_burst(State),
+
+    %% only send a synhrounous request to the disk_log process
+    %% every DLSyncInt time, to give the handler time between
+    %% writes so it can keep up with incoming messages
+    {Status,LastQLen1,State1} =
+        if DoWrite, DLSync == 0 ->
+                ?observe(Name,{_CallOrCast,1}),
+                NewState = disk_log_write(Name, Bin, State),
+                {ok, element(2,process_info(self(),message_queue_len)),
+                 NewState};
+           DoWrite ->
+                ?observe(Name,{_CallOrCast,1}),
+                NewState = disk_log_write(Name, Bin, State),
+                {ok, LastQLen, NewState};
+           not DoWrite ->
+                ?observe(Name,{flushed,1}),
+                {dropped, LastQLen, State}
+        end,
+
+    %% Check if the time since the previous log request is long enough -
+    %% and the queue length small enough - to assume the mailbox has
+    %% been emptied, and if so, do filesync operation and reset mode to
+    %% async. Note that this is the best we can do to detect an idle
+    %% handler without setting a timer after each log call/cast. If the
+    %% time between two consecutive log requests is fast and no new
+    %% request comes in after the last one, idle state won't be detected!
+    Time = ?diff_time(T1,T0),
+    {Mode1,BurstMsgCount1,State2} =
+        if (LastQLen1 < ?FILESYNC_OK_QLEN) andalso
+           (Time > ?IDLE_DETECT_TIME_USEC) ->
+                {?change_mode(Name,Mode,async), 0, disk_log_sync(Name,State1)};
+           true ->
+                {Mode, BurstMsgCount,State1}
+        end,
+    
+    State3 =
+        ?update_calls_or_casts(_CallOrCast,1,State2),
+    State4 =
+        ?update_max_time(Time,
+                         State3#{mode => Mode1,
+                                 last_qlen := LastQLen1,
+                                 last_log_ts => T1,
+                                 burst_win_ts => BurstWinT,
+                                 burst_msg_count => BurstMsgCount1,
+                                 dl_sync => ?update_dl_sync(DLSync,DLSyncInt)}),
+    {Status,State4}.
+
+
+open_disk_log(Name, LogOpts) ->
+    #{file          := File,
+      max_no_bytes  := MaxNoBytes,
+      max_no_files  := MaxNoFiles,
+      type          := Type} = LogOpts,
+    case filelib:ensure_dir(File) of
+        ok ->
+            Size =
+                if Type == halt -> MaxNoBytes;
+                   Type == wrap -> {MaxNoBytes,MaxNoFiles}
+                end,
+            Opts = [{name,   Name},
+                    {file,   File},
+                    {size,   Size},
+                    {type,   Type},
+                    {linkto, self()},
+                    {repair, false},
+                    {format, external},
+                    {notify, true},
+                    {quiet,  true},
+                    {mode,   read_write}],            
+            case disk_log:open(Opts) of
+                {ok,Name} ->
+                    ok;
+                Error = {error,_Reason} ->            
+                    Error
+            end;
+        Error ->
+            Error
+    end.
+
+close_disk_log(Name, _) ->
+    _ = ?disk_log_sync(Name),
+    _ = disk_log:lclose(Name),
+    ok.
+
+disk_log_write(Name, Bin, State) ->
+    Result =
+        case ?disk_log_blog(Name, Bin) of
+            ok ->
+                ok;
+            LogError ->
+                _ = case maps:get(prev_log_result, State) of
+                        LogError ->
+                            %% don't report same error twice
+                            ok;
+                        _ ->
+                            LogOpts = maps:get(log_opts, State),
+                            logger_h_common:error_notify({Name,log,
+                                                          LogOpts,
+                                                          LogError})
+                    end,
+                LogError
+        end,
+    State#{prev_log_result => Result}.
+
+disk_log_sync(Name, State) ->
+    Result =
+        case ?disk_log_sync(Name) of
+            ok ->
+                ok;
+            SyncError ->
+                _ = case maps:get(prev_sync_result, State) of
+                        SyncError ->
+                            %% don't report same error twice
+                            ok;
+                        _ ->
+                            LogOpts = maps:get(log_opts, State),
+                            logger_h_common:error_notify({Name,sync,
+                                                          LogOpts,
+                                                          SyncError})
+                    end,
+                SyncError
+        end,
+    State#{prev_sync_result => Result}. 
+
+error_notify_new(Info,Info, _Term) ->
+    ok;
+error_notify_new(_Info0,_Info1, Term) ->
+    logger_h_common:error_notify(Term).
diff --git a/lib/kernel/src/logger_filters.erl b/lib/kernel/src/logger_filters.erl
new file mode 100644
index 0000000000..85928f0fd6
--- /dev/null
+++ b/lib/kernel/src/logger_filters.erl
@@ -0,0 +1,123 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_filters).
+
+-export([domain/2,
+         level/2,
+         progress/2,
+         remote_gl/2]).
+
+-include("logger_internal.hrl").
+-define(IS_ACTION(A), (A==log orelse A==stop)).
+
+-spec domain(Log,Extra) -> logger:filter_return() when
+      Log :: logger:log(),
+      Extra :: {Action,Compare,MatchDomain},
+      Action :: log | stop,
+      Compare :: prefix_of | starts_with | equals | no_domain,
+      MatchDomain :: list(atom()).
+domain(#{meta:=Meta}=Log,{Action,Compare,MatchDomain})
+  when ?IS_ACTION(Action) andalso
+       (Compare==prefix_of orelse
+        Compare==starts_with orelse
+        Compare==equals orelse
+        Compare==no_domain) andalso
+       is_list(MatchDomain) ->
+    filter_domain(Compare,Meta,MatchDomain,on_match(Action,Log));
+domain(Log,Extra) ->
+    erlang:error(badarg,[Log,Extra]).
+
+-spec level(Log,Extra) -> logger:filter_return() when
+      Log :: logger:log(),
+      Extra :: {Action,Operator,MatchLevel},
+      Action :: log | stop,
+      Operator :: neq | eq | lt | gt | lteq | gteq,
+      MatchLevel :: logger:level().
+level(#{level:=L1}=Log,{Action,Op,L2})
+  when ?IS_ACTION(Action) andalso 
+       (Op==neq orelse
+        Op==eq orelse
+        Op==lt orelse
+        Op==gt orelse
+        Op==lteq orelse
+        Op==gteq) andalso
+       ?IS_LEVEL(L2) ->
+    filter_level(Op,L1,L2,on_match(Action,Log));
+level(Log,Extra) ->
+    erlang:error(badarg,[Log,Extra]).
+
+-spec progress(Log,Extra) -> logger:filter_return() when
+      Log :: logger:log(),
+      Extra :: log | stop.
+progress(Log,Action) when ?IS_ACTION(Action) ->
+    filter_progress(Log,on_match(Action,Log));
+progress(Log,Action) ->
+    erlang:error(badarg,[Log,Action]).
+
+-spec remote_gl(Log,Extra) -> logger:filter_return() when
+      Log :: logger:log(),
+      Extra :: log | stop.
+remote_gl(Log,Action) when ?IS_ACTION(Action) ->
+    filter_remote_gl(Log,on_match(Action,Log));
+remote_gl(Log,Action) ->
+    erlang:error(badarg,[Log,Action]).
+
+%%%-----------------------------------------------------------------
+%%% Internal
+filter_domain(prefix_of,#{domain:=Domain},MatchDomain,OnMatch) ->
+    is_prefix(Domain,MatchDomain,OnMatch);
+filter_domain(starts_with,#{domain:=Domain},MatchDomain,OnMatch) ->
+    is_prefix(MatchDomain,Domain,OnMatch);
+filter_domain(equals,#{domain:=Domain},Domain,OnMatch) ->
+    OnMatch;
+filter_domain(Action,Meta,_,OnMatch) ->
+    case maps:is_key(domain,Meta) of
+        false when Action==no_domain -> OnMatch;
+        _ -> ignore
+    end.
+
+is_prefix(D1,D2,OnMatch) when is_list(D1), is_list(D2) ->
+    case lists:prefix(D1,D2) of
+        true -> OnMatch;
+        false -> ignore
+    end;
+is_prefix(_,_,_) ->
+    ignore.
+
+filter_level(Op,L1,L2,OnMatch) ->
+    case logger:compare_levels(L1,L2) of
+        eq when Op==eq; Op==lteq; Op==gteq -> OnMatch;
+        lt when Op==lt; Op==lteq; Op==neq -> OnMatch;
+        gt when Op==gt; Op==gteq; Op==neq -> OnMatch;
+        _ -> ignore
+    end.
+
+filter_progress(#{msg:={report,#{label:={_,progress}}}},OnMatch) ->
+    OnMatch;
+filter_progress(_,_) ->
+    ignore.
+
+filter_remote_gl(#{meta:=#{gl:=GL}},OnMatch) when node(GL)=/=node() ->
+    OnMatch;
+filter_remote_gl(_,_) ->
+    ignore.
+
+on_match(log,Log) -> Log;
+on_match(stop,_) -> stop.
diff --git a/lib/kernel/src/logger_formatter.erl b/lib/kernel/src/logger_formatter.erl
new file mode 100644
index 0000000000..91283ab299
--- /dev/null
+++ b/lib/kernel/src/logger_formatter.erl
@@ -0,0 +1,255 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_formatter).
+
+-export([format/2]).
+
+-include("logger_internal.hrl").
+
+%%%-----------------------------------------------------------------
+%%% Types
+-type template() :: [atom()|tuple()|string()].
+
+%%%-----------------------------------------------------------------
+%%% API
+-spec format(Log,Config) -> String when
+      Log :: logger:log(),
+      Config :: #{single_line=>boolean(),
+                  legacy_header=>boolean(),
+                  report_cb=>fun((logger:report()) -> {io:format(),[term()]}),
+                  max_size=>pos_integer() | unlimited,
+                  depth=>pos_integer() | unlimited,
+                  template=>template(),
+                  utc=>boolean()},
+      String :: string().
+format(#{level:=Level,msg:=Msg0,meta:=Meta},Config0)
+  when is_map(Config0) ->
+    Config = add_default_config(Config0),
+    Meta1 = maybe_add_legacy_header(Level,Meta,Config),
+    MsgStr0 = format_msg(Msg0,Meta1,Config),
+    MsgStr =
+        case maps:get(single_line,Config) of
+            true ->
+                %% Trim leading and trailing whitespaces, and replace
+                %% newlines with ", "
+                re:replace(string:trim(MsgStr0),",?\r?\n\s*",", ",
+                           [{return,list},global]);
+            _false2 ->
+                MsgStr0
+        end,
+    String = do_format(Level,MsgStr,Meta1,maps:get(template,Config),Config),
+    truncate(String,maps:get(max_size,Config)).
+
+do_format(Level,Msg,Data,[level|Format],Config) ->
+    [to_string(level,Level,Config)|do_format(Level,Msg,Data,Format,Config)];
+do_format(Level,Msg,Data,[msg|Format],Config) ->
+    [Msg|do_format(Level,Msg,Data,Format,Config)];
+do_format(Level,Msg,Data,[Key|Format],Config) when is_atom(Key); is_tuple(Key) ->
+    Value = value(Key,Data),
+    [to_string(Key,Value,Config)|do_format(Level,Msg,Data,Format,Config)];
+do_format(Level,Msg,Data,[Str|Format],Config) ->
+    [Str|do_format(Level,Msg,Data,Format,Config)];
+do_format(_Level,_Msg,_Data,[],_Config) ->
+    [].
+
+value(Key,Meta) when is_atom(Key), is_map(Meta) ->
+    maps:get(Key,Meta,"");
+value(Key,_) when is_atom(Key) ->
+    "";
+value(Keys,Meta) when is_tuple(Keys) ->
+    value(tuple_to_list(Keys),Meta);
+value([Key|Keys],Meta) ->
+    value(Keys,value(Key,Meta));
+value([],Value) ->
+    Value.
+
+to_string(time,Time,Config) ->
+    format_time(Time,Config);
+to_string(mfa,MFA,_Config) ->
+    format_mfa(MFA);
+to_string(_,Value,_Config) ->
+    to_string(Value).
+
+to_string(X) when is_atom(X) ->
+    atom_to_list(X);
+to_string(X) when is_integer(X) ->
+    integer_to_list(X);
+to_string(X) when is_pid(X) ->
+    pid_to_list(X);
+to_string(X) when is_reference(X) ->
+    ref_to_list(X);
+to_string(X) when is_list(X) ->
+    case io_lib:printable_unicode_list(lists:flatten(X)) of
+        true -> X;
+        _ -> io_lib:format("~tp",[X])
+    end;
+to_string(X) ->
+    io_lib:format("~tp",[X]).
+
+format_msg({string,Chardata},Meta,Config) ->
+    try unicode:characters_to_list(Chardata)
+    catch _:_ -> format_msg({"INVALID STRING: ~tp",[Chardata]},Meta,Config)
+    end;
+format_msg({report,_}=Msg,Meta,#{report_cb:=Fun}=Config) when is_function(Fun,1) ->
+    format_msg(Msg,Meta#{report_cb=>Fun},maps:remove(report_cb,Config));
+format_msg({report,Report},#{report_cb:=Fun}=Meta,Config) when is_function(Fun,1) ->
+    try Fun(Report) of
+        {Format,Args} when is_list(Format), is_list(Args) ->
+            format_msg({Format,Args},maps:remove(report_cb,Meta),Config);
+        Other ->
+            format_msg({"REPORT_CB ERROR: ~tp; Returned: ~tp",
+                        [Report,Other]},Meta,Config)
+    catch C:R ->
+            format_msg({"REPORT_CB CRASH: ~tp; Reason: ~tp",
+                        [Report,{C,R}]},Meta,Config)
+    end;
+format_msg({report,Report},Meta,Config) ->
+    format_msg({report,Report},
+               Meta#{report_cb=>fun logger:format_report/1},
+               Config);
+format_msg(Msg,_Meta,Config) ->
+    limit_depth(Msg, maps:get(depth,Config)).
+
+limit_depth(Msg,false) ->
+    Depth = logger:get_format_depth(),
+    limit_depth(Msg,Depth);
+limit_depth({Format,Args},unlimited) ->
+    try io_lib:format(Format,Args)
+    catch _:_ ->
+            io_lib:format("FORMAT ERROR: ~tp - ~tp",[Format,Args])
+    end;
+limit_depth({Format0,Args},Depth) ->
+    try
+        Format1 = io_lib:scan_format(Format0, Args),
+        Format = limit_format(Format1, Depth),
+        io_lib:build_text(Format)
+    catch _:_ ->
+            limit_depth({"FORMAT ERROR: ~tp - ~tp",[Format0,Args]},Depth)
+    end.
+
+limit_format([#{control_char:=C0}=M0|T], Depth) when C0 =:= $p;
+						     C0 =:= $w ->
+    C = C0 - ($a - $A),				%To uppercase.
+    #{args:=Args} = M0,
+    M = M0#{control_char:=C,args:=Args++[Depth]},
+    [M|limit_format(T, Depth)];
+limit_format([H|T], Depth) ->
+    [H|limit_format(T, Depth)];
+limit_format([], _) ->
+    [].
+
+truncate(String,unlimited) ->
+    String;
+truncate(String,false) ->
+    Size = logger:get_max_size(),
+    truncate(String,Size);
+truncate(String,Size) ->
+    Length = string:length(String),
+    if Length>Size ->
+            string:slice(String,0,Size-3)++"...";
+       true ->
+            String
+    end.
+
+format_time(Timestamp,Config) when is_integer(Timestamp) ->
+    {Date,Time,Micro} = timestamp_to_datetimemicro(Timestamp,Config),
+    format_time(Date,Time,Micro);
+format_time(Other,_Config) ->
+    %% E.g. a string
+    to_string(Other).
+
+format_time({Y,M,D},{H,Min,S},Micro) ->
+    io_lib:format("~4w-~2..0w-~2..0w ~2w:~2..0w:~2..0w.~6..0w",
+                  [Y,M,D,H,Min,S,Micro]).
+
+%% Assuming this is monotonic time in microseconds
+timestamp_to_datetimemicro(Timestamp,Config) when is_integer(Timestamp) ->
+    SysTime = Timestamp + erlang:time_offset(microsecond),
+    Micro = SysTime rem 1000000,
+    Sec = SysTime div 1000000,
+    UniversalTime =  erlang:posixtime_to_universaltime(Sec),
+    {Date,Time} =
+        case Config of
+            #{utc:=true} -> UniversalTime;
+            _ -> erlang:universaltime_to_localtime(UniversalTime)
+        end,
+    {Date,Time,Micro}.
+
+format_mfa({M,F,A}) when is_atom(M), is_atom(F), is_integer(A) ->
+    atom_to_list(M)++":"++atom_to_list(F)++"/"++integer_to_list(A);
+format_mfa({M,F,A}) when is_atom(M), is_atom(F), is_list(A) ->
+    format_mfa({M,F,length(A)});
+format_mfa(MFA) ->
+    to_string(MFA).
+
+maybe_add_legacy_header(Level,
+                        #{time:=Timestamp}=Meta,
+                        #{legacy_header:=true}=Config) ->
+    #{title:=Title}=MyMeta = add_legacy_title(Level,maps:get(?MODULE,Meta,#{})),
+    {{Y,Mo,D},{H,Mi,S},Micro} = timestamp_to_datetimemicro(Timestamp,Config),
+    Header = io_lib:format("=~ts==== ~w-~s-~4w::~2..0w:~2..0w:~2..0w.~6..0w ~s===",
+                           [Title,D,month(Mo),Y,H,Mi,S,Micro,utcstr(Config)]),
+    Meta#{?MODULE=>MyMeta#{header=>Header}};
+maybe_add_legacy_header(_,Meta,_) ->
+    Meta.
+
+add_legacy_title(_Level,#{title:=_}=MyMeta) ->
+    MyMeta;
+add_legacy_title(Level,MyMeta) ->
+    Title = string:uppercase(atom_to_list(Level)) ++ " REPORT",
+    MyMeta#{title=>Title}.
+
+month(1) -> "Jan";
+month(2) -> "Feb";
+month(3) -> "Mar";
+month(4) -> "Apr";
+month(5) -> "May";
+month(6) -> "Jun";
+month(7) -> "Jul";
+month(8) -> "Aug";
+month(9) -> "Sep";
+month(10) -> "Oct";
+month(11) -> "Nov";
+month(12) -> "Dec".
+
+utcstr(#{utc:=true}) -> "UTC ";
+utcstr(_) -> "".
+
+add_default_config(#{utc:=_}=Config) ->
+    Default =
+        #{legacy_header=>false,
+          single_line=>false,
+          max_size=>false,
+          depth=>false},
+    add_default_template(maps:merge(Default,Config));
+add_default_config(Config) ->
+    add_default_config(Config#{utc=>logger:get_utc_config()}).
+
+add_default_template(#{template:=_}=Config) ->
+    Config;
+add_default_template(Config) ->
+    Config#{template=>default_template(Config)}.
+
+default_template(#{legacy_header:=true}) ->
+    ?DEFAULT_FORMAT_TEMPLATE_HEADER;
+default_template(#{single_line:=true}) ->
+    ?DEFAULT_FORMAT_TEMPLATE_SINGLE;
+default_template(_) ->
+    ?DEFAULT_FORMAT_TEMPLATE.
diff --git a/lib/kernel/src/logger_h_common.erl b/lib/kernel/src/logger_h_common.erl
new file mode 100644
index 0000000000..7a5082fb84
--- /dev/null
+++ b/lib/kernel/src/logger_h_common.erl
@@ -0,0 +1,305 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_h_common).
+
+-include("logger_h_common.hrl").
+-include("logger_internal.hrl").
+
+-export([log_to_binary/2,
+         check_common_config/1,
+         call_cast_or_drop/2,
+         check_load/1,
+         limit_burst/1,
+         kill_if_choked/4,
+         flush_log_requests/0,
+         flush_log_requests/1,
+         handler_exit/2,
+         cancel_timer/1,
+         stop_or_restart/3,
+         overload_levels_ok/1,
+         error_notify/1,
+         info_notify/1]).
+
+%%%-----------------------------------------------------------------
+%%% Covert log data on any form to binary
+-spec log_to_binary(Log,Config) -> LogString when
+      Log :: logger:log(),
+      Config :: logger:config(),
+      LogString :: binary().
+log_to_binary(#{msg:={report,_},meta:=#{report_cb:=_}}=Log,Config) ->
+    do_log_to_binary(Log,Config);
+log_to_binary(#{msg:={report,_},meta:=Meta}=Log,Config) ->
+    DefaultReportCb = fun logger:format_otp_report/1,
+    do_log_to_binary(Log#{meta=>Meta#{report_cb=>DefaultReportCb}},Config);
+log_to_binary(Log,Config) ->
+    do_log_to_binary(Log,Config).
+
+do_log_to_binary(Log,Config) ->
+    {Formatter,FormatterConfig} = maps:get(formatter,Config),
+    String = try_format(Log,Formatter,FormatterConfig),
+    try unicode:characters_to_binary(String)
+    catch _:_ ->
+            ?LOG_INTERNAL(debug,[{formatter_error,Formatter},
+                                 {config,FormatterConfig},
+                                 {log,Log},
+                                 {bad_return_value,String}]),
+            <<"FORMATTER ERROR: bad_return_value">>
+    end.
+
+try_format(Log,Formatter,FormatterConfig) ->
+    try Formatter:format(Log,FormatterConfig)
+    catch
+        C:R:S ->
+            ?LOG_INTERNAL(debug,[{formatter_crashed,Formatter},
+                                 {config,FormatterConfig},
+                                 {log,Log},
+                                 {reason,
+                                  {C,R,logger:filter_stacktrace(?MODULE,S)}}]),
+            case {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG} of
+                {Formatter,FormatterConfig} ->
+                    "DEFAULT FORMATTER CRASHED";
+                {DefaultFormatter,DefaultConfig} ->
+                    try_format(Log#{msg=>{"FORMATTER CRASH: ~tp",
+                                          [maps:get(msg,Log)]}},
+                              DefaultFormatter,DefaultConfig)
+            end
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Check that the configuration term is valid
+check_common_config({toggle_sync_qlen,N}) when is_integer(N) ->
+    valid;
+check_common_config({drop_new_reqs_qlen,N}) when is_integer(N) ->
+    valid;
+check_common_config({flush_reqs_qlen,N}) when is_integer(N) ->
+    valid;
+check_common_config({enable_burst_limit,Bool}) when Bool == true;
+                                                    Bool == false ->
+    valid;
+check_common_config({burst_limit_size,N}) when is_integer(N) ->
+    valid;
+check_common_config({burst_window_time,N}) when is_integer(N) ->
+    valid;
+check_common_config({enable_kill_overloaded,Bool}) when Bool == true;
+                                                        Bool == false ->
+    valid;
+check_common_config({handler_overloaded_qlen,N}) when is_integer(N) ->
+    valid;
+check_common_config({handler_overloaded_mem,N}) when is_integer(N) ->
+    valid;
+check_common_config({handler_restart_after,NorA})  when is_integer(NorA);
+                                                        NorA == never ->
+    valid;
+check_common_config({filesync_repeat_interval,NorA}) when is_integer(NorA);
+                                                          NorA == no_repeat ->
+    valid;
+check_common_config(_) ->
+    invalid.
+
+
+%%%-----------------------------------------------------------------
+%%% Overload Protection
+call_cast_or_drop(Name, Bin) ->
+    %% If the handler process is getting overloaded, the log request
+    %% will be synchronous instead of asynchronous (slows down the
+    %% logging tempo of a process doing lots of logging. If the
+    %% handler is choked, drop mode is set and no request will be sent.
+    try ?get_mode(Name) of
+        async ->
+            gen_server:cast(Name, {log,Bin});
+        sync ->
+            try gen_server:call(Name, {log,Bin}, ?DEFAULT_CALL_TIMEOUT) of
+                %% if return value from call == dropped, the
+                %% message has been flushed by handler and should
+                %% therefore not be counted as dropped in stats
+                ok      -> ok;
+                dropped -> ok
+            catch
+                _:{timeout,_} ->
+                    %%! --- Tue Mar  6 23:10:48 2018 --- peppe was here!
+                    erlang:display('CLIENT_TIMEOUT'),
+                    %% exit('CLIENT_TIMEOUT'),
+
+                    ?observe(Name,{dropped,1})
+            end;
+        drop -> ?observe(Name,{dropped,1})
+    catch
+        %% if the ETS table doesn't exist (maybe because of a
+        %% handler restart), we can only drop the request
+        _:_ -> ?observe(Name,{dropped,1})
+    end,
+    ok.
+
+handler_exit(_Name, Reason) ->
+    exit(Reason).
+
+check_load(State = #{id:=Name, mode := Mode,
+                     toggle_sync_qlen := ToggleSyncQLen,
+                     drop_new_reqs_qlen := DropNewQLen,
+                     flush_reqs_qlen := FlushQLen}) ->
+    {_,Mem} = process_info(self(), memory),
+    ?observe(Name,{max_mem,Mem}),
+    %% make sure the handler process doesn't get scheduled
+    %% out between the message_queue_len check below and the
+    %% action that follows (flush or write).
+    {_,QLen} = process_info(self(), message_queue_len),
+    ?observe(Name,{max_qlen,QLen}),
+
+    {Mode1,_NewDrops,_NewFlushes} =
+        if
+            QLen >= FlushQLen ->
+                {flush, 0,1};
+            QLen >= DropNewQLen ->
+                %% Note that drop mode will force log requests to
+                %% be dropped on the client side (never sent get to
+                %% the handler).
+                IncDrops = if Mode == drop -> 0; true -> 1 end,
+                {?change_mode(Name, Mode, drop), IncDrops,0};
+            QLen >= ToggleSyncQLen ->
+                {?change_mode(Name, Mode, sync), 0,0};
+            true ->
+                {?change_mode(Name, Mode, async), 0,0}
+        end,
+    State1 = ?update_other(drops,DROPS,_NewDrops,State),
+    {Mode1, QLen, Mem,
+     ?update_other(flushes,FLUSHES,_NewFlushes,
+                   State1#{last_qlen => QLen})}.
+
+limit_burst(#{enable_burst_limit := false}) ->
+     {true,0,0};
+limit_burst(#{burst_win_ts := BurstWinT0,
+              burst_msg_count := BurstMsgCount,
+              burst_window_time := BurstWinTime,
+              burst_limit_size := BurstLimitSz}) ->
+    if (BurstMsgCount >= BurstLimitSz) -> 
+            %% the limit for allowed messages has been reached
+            BurstWinT1 = ?timestamp(),
+            case ?diff_time(BurstWinT1,BurstWinT0) of
+                BurstCheckTime when BurstCheckTime < (BurstWinTime*1000) ->
+                    %% we're still within the burst time frame
+                    {false,BurstWinT0,BurstMsgCount};
+                _BurstCheckTime ->
+                    %% burst time frame passed, reset counters
+                    {true,BurstWinT1,0}
+            end;
+       true ->
+            %% the limit for allowed messages not yet reached
+            {true,BurstWinT0,BurstMsgCount+1}
+    end.
+
+kill_if_choked(Name, QLen, Mem,
+               #{enable_kill_overloaded := KillIfOL,
+                 handler_overloaded_qlen := HOLQLen,
+                 handler_overloaded_mem := HOLMem}) ->
+    if KillIfOL andalso
+       ((QLen > HOLQLen) orelse (Mem > HOLMem)) ->            
+            handler_exit(Name, {shutdown,{overloaded,Name,QLen,Mem}});
+       true ->
+            ok
+    end.
+
+flush_log_requests() ->
+    flush_log_requests(-1).
+
+flush_log_requests(Limit) ->
+    process_flag(priority, high),
+    Flushed = flush_log_requests(0, Limit),
+    process_flag(priority, normal),
+    Flushed.
+
+flush_log_requests(Limit, Limit) ->
+    Limit;
+flush_log_requests(N, Limit) ->
+    %% flush log requests but leave other requests, such as
+    %% file/disk_log_sync, info and change_config, so that these
+    %% have a chance to be processed even under heavy load
+    receive
+        {'$gen_cast',{log,_}} ->
+            flush_log_requests(N+1, Limit);
+        {'$gen_call',{Pid,MRef},{log,_}} ->
+            Pid ! {MRef, dropped},
+            flush_log_requests(N+1, Limit)
+    after
+        0 -> N
+    end.
+
+cancel_timer(TRef) when is_atom(TRef) -> ok;
+cancel_timer(TRef) -> timer:cancel(TRef).
+
+
+stop_or_restart(Name, {shutdown,Reason={overloaded,_Name,_QLen,_Mem}},
+                #{handler_restart_after := RestartAfter}) ->
+    %% If we're terminating because of an overload situation (see
+    %% logger_h_common:kill_if_choked/4), we need to remove the handler
+    %% and set a restart timer. A separate process must perform this
+    %% in order to avoid deadlock.
+    HandlerPid = self(),
+    RemoveAndRestart =
+        fun() ->
+                MRef = erlang:monitor(process, HandlerPid),
+                receive
+                    {'DOWN',MRef,_,_,_} ->
+                        ok
+                after 30000 ->
+                        error_notify(Reason),
+                        exit(HandlerPid, kill)
+                end,
+                case logger:get_handler_config(Name) of
+                    {ok,{HMod,HConfig}} when is_integer(RestartAfter) ->
+                        _ = logger:remove_handler(Name),
+                        _ = timer:apply_after(RestartAfter, logger, add_handler,
+                                              [Name,HMod,HConfig]);
+                    {ok,_} ->
+                        _ = logger:remove_handler(Name);
+                    {error,CfgReason} when is_integer(RestartAfter) ->
+                        error_notify({Name,restart_impossible,CfgReason});
+                    {error,_} ->
+                        ok
+                end
+        end,
+    spawn(RemoveAndRestart),
+    ok;
+
+stop_or_restart(Name, shutdown, _State) ->
+    %% Probably terminated by supervisor. Remove the handler to avoid
+    %% error printouts due to failing handler.
+    _ = case logger:get_handler_config(Name) of
+            {ok,_} ->
+                %% Spawning to avoid deadlock
+                spawn(logger,remove_handler,[Name]);
+            _ ->
+                ok
+        end,
+    ok;
+
+stop_or_restart(_Name, _Reason, _State) ->
+    ok.
+
+overload_levels_ok(HandlerConfig) ->
+    TSQL = maps:get(toggle_sync_qlen, HandlerConfig, ?TOGGLE_SYNC_QLEN),
+    DNRQL = maps:get(drop_new_reqs_qlen, HandlerConfig, ?DROP_NEW_REQS_QLEN),
+    FRQL = maps:get(flush_reqs_qlen, HandlerConfig, ?FLUSH_REQS_QLEN),
+    (TSQL < DNRQL) andalso (DNRQL < FRQL).
+
+error_notify(Term) ->
+    ?internal_log(error, Term).
+
+info_notify(Term) ->
+    ?internal_log(info, Term).
diff --git a/lib/kernel/src/logger_h_common.hrl b/lib/kernel/src/logger_h_common.hrl
new file mode 100644
index 0000000000..f110bbaf97
--- /dev/null
+++ b/lib/kernel/src/logger_h_common.hrl
@@ -0,0 +1,262 @@
+
+%%%-----------------------------------------------------------------
+%%% Overload protection configuration
+
+%%! *** NOTE *** 
+%%! It's important that:
+%%! TOGGLE_SYNC_QLEN < DROP_NEW_REQS_QLEN < FLUSH_REQS_QLEN
+%%! and that DROP_NEW_REQS_QLEN >= 2.
+%%! Otherwise the handler could end up in drop mode with no new
+%%! log requests to process. This would cause all future requests
+%%! to be dropped (no switch to async mode would ever take place).
+
+%% This specifies the message_queue_len value where the log
+%% requests switch from asynchronous casts to synchronous calls.
+-define(TOGGLE_SYNC_QLEN, 10).
+%% Above this message_queue_len, log requests will be dropped,
+%% i.e. no log requests get sent to the handler process.
+-define(DROP_NEW_REQS_QLEN, 200).
+%% Above this message_queue_len, the handler process will flush
+%% its mailbox and only leave this number of messages in it.
+-define(FLUSH_REQS_QLEN, 1000).
+
+%% Never flush more than this number of messages in one go,
+%% or the handler will be unresponsive for seconds (keep this
+%% number as large as possible or the mailbox could grow large).
+-define(FLUSH_MAX_N, 5000).
+
+%% BURST_LIMIT is the max number of log requests allowed to be
+%% written within a BURST_WINDOW_TIME time frame.
+-define(ENABLE_BURST_LIMIT, true).
+-define(BURST_LIMIT_SIZE, 500).
+-define(BURST_WINDOW_TIME, 1000).
+
+%% This enables/disables the feature to automatically get the
+%% handler terminated if it gets too loaded (and can't keep up).
+-define(ENABLE_KILL_OVERLOADED, false).
+%% If the message_queue_len goes above this size even after
+%% flushing has been performed, the handler is terminated.
+-define(HANDLER_OVERLOADED_QLEN, 20000).
+%% If the memory usage exceeds this level
+-define(HANDLER_OVERLOADED_MEM, 3000000).
+
+%% This is the default time that the handler will wait before
+%% restarting and accepting new requests. The value 'never'
+%% disables restarts.
+-define(HANDLER_RESTART_AFTER, 5000).
+%%-define(HANDLER_RESTART_AFTER, never).
+
+%% The handler sends asynchronous write requests to the process
+%% controlling the i/o device, but every once in this interval
+%% will the write request be synchronous, so that the i/o device
+%% process doesn't get overloaded. This gives the handler time
+%% to keep up with its mailbox in overload situations, even if
+%% the i/o is slow.
+-define(CONTROLLER_SYNC_INTERVAL, 20).
+%% The handler will not perform a file sync operation if the
+%% mailbox size is greater than this number. This is to ensure
+%% the handler process doesn't get overloaded while waiting for
+%% an expensive file sync operation to finish.
+-define(FILESYNC_OK_QLEN, 2). 
+%% Do a file/disk_log sync operation every integer() millisec
+%% (if necessary) or set to 'no_repeat' to only do file sync when
+%% the handler is idle. Note that file sync is not guaranteed to
+%% happen automatically if this operation is disabled.
+-define(FILESYNC_REPEAT_INTERVAL, 5000).
+%%-define(FILESYNC_REPEAT_INTERVAL, no_repeat).
+
+%% This is the time after last message received that we think/hope
+%% that the handler has an empty mailbox (no new log request has
+%% come in).
+-define(IDLE_DETECT_TIME_MSEC, 100).
+-define(IDLE_DETECT_TIME_USEC, 100000).
+
+%% Default disk log option values
+-define(DISK_LOG_TYPE, wrap).
+-define(DISK_LOG_MAX_NO_FILES, 10).
+-define(DISK_LOG_MAX_NO_BYTES, 1048576).
+
+%%%-----------------------------------------------------------------
+%%% Overload protection macros
+
+-define(timestamp(), erlang:monotonic_time(microsecond)).
+
+-define(get_mode(HandlerName),
+        case ets:lookup(HandlerName, mode) of
+            [{mode,sync}] ->
+                case whereis(HandlerName)==self() of
+                    true -> async;
+                    _ -> sync
+                end;
+            [{mode,M}] -> M;
+            _          -> async
+        end).
+
+-define(set_mode(HandlerName, M),
+        begin ets:insert(HandlerName, {mode,M}), M end).
+
+-define(change_mode(HandlerName, M0, M1),
+        if M0 == M1 ->
+                M0;
+           true ->
+                ets:insert(HandlerName, {mode,M1}),
+                M1
+        end).
+
+-define(min(X1, X2),
+        if X2 == undefined -> X1;
+           X2 < X1 -> X2;
+           true -> X1
+        end).
+
+-define(max(X1, X2),
+        if 
+            X2 == undefined -> X1;
+            X2 > X1 -> X2;
+            true -> X1
+        end).
+
+-define(diff_time(OS_T1, OS_T0), OS_T1-OS_T0).
+
+%%%-----------------------------------------------------------------
+%%% The test hook macros make it possible to observe and manipulate
+%%% internal handler functionality. When enabled, these macros will
+%%% slow down execution and therefore should not be include in code
+%%% to be officially released.
+
+%% -define(TEST_HOOKS, true).
+-ifdef(TEST_HOOKS).
+  -define(TEST_HOOKS_TAB, logger_h_test_hooks).
+
+  -define(init_test_hooks(),
+          _ = case ets:whereis(?TEST_HOOKS_TAB) of
+                  undefined -> ets:new(?TEST_HOOKS_TAB, [named_table,public]);
+                  _         -> ok
+              end,
+          ets:insert(?TEST_HOOKS_TAB, {internal_log,{logger,internal_log}}),
+          ets:insert(?TEST_HOOKS_TAB, {file_write,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {file_datasync,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {disk_log_blog,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {disk_log_sync,ok})).
+
+  -define(set_internal_log(MOD_FUNC),
+          ets:insert(?TEST_HOOKS_TAB, {internal_log,MOD_FUNC})).
+
+  -define(set_result(OPERATION, RESULT),
+          ets:insert(?TEST_HOOKS_TAB, {OPERATION,RESULT})).
+
+  -define(set_defaults(),
+          ets:insert(?TEST_HOOKS_TAB, {internal_log,{logger,internal_log}}),
+          ets:insert(?TEST_HOOKS_TAB, {file_write,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {file_datasync,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {disk_log_blog,ok}),
+          ets:insert(?TEST_HOOKS_TAB, {disk_log_sync,ok})).
+
+  -define(internal_log(TYPE, TERM),
+          try ets:lookup(?TEST_HOOKS_TAB, internal_log) of
+              [{_,{LMOD,LFUNC}}] -> apply(LMOD, LFUNC, [TYPE,TERM]);
+              _ -> logger:internal_log(TYPE, TERM)
+          catch _:_ -> logger:internal_log(TYPE, TERM) end).
+
+  -define(file_write(DEVICE, DATA),
+          try ets:lookup(?TEST_HOOKS_TAB, file_write) of
+              [{_,ok}]    -> file:write(DEVICE, DATA);
+              [{_,ERROR}] -> ERROR
+          catch _:_       -> file:write(DEVICE, DATA) end).
+
+  -define(file_datasync(DEVICE),
+          try ets:lookup(?TEST_HOOKS_TAB, file_datasync) of
+              [{_,ok}]    -> file:datasync(DEVICE);
+              [{_,ERROR}] -> ERROR
+          catch _:_       -> file:datasync(DEVICE) end).
+
+  -define(disk_log_blog(LOG, DATA),
+          try ets:lookup(?TEST_HOOKS_TAB, disk_log_blog) of
+              [{_,ok}]    -> disk_log:blog(LOG, DATA);
+              [{_,ERROR}] -> ERROR
+          catch _:_       -> disk_log:blog(LOG, DATA) end).
+
+  -define(disk_log_sync(LOG),
+          try ets:lookup(?TEST_HOOKS_TAB, disk_log_sync) of
+              [{_,ok}]    -> disk_log:sync(LOG);
+              [{_,ERROR}] -> ERROR
+          catch _:_       -> disk_log:sync(LOG) end).
+
+  -define(DEFAULT_CALL_TIMEOUT, 5000).
+
+-else.                                          % DEFAULTS!
+  -define(TEST_HOOKS_TAB, undefined).
+  -define(init_test_hooks(), ok).
+  -define(set_internal_log(_MOD_FUNC), ok).
+  -define(set_result(_OPERATION, _RESULT), ok).
+  -define(set_defaults(), ok).
+  -define(internal_log(TYPE, TERM), logger:internal_log(TYPE, TERM)).
+  -define(file_write(DEVICE, DATA), file:write(DEVICE, DATA)).
+  -define(file_datasync(DEVICE), file:datasync(DEVICE)).
+  -define(disk_log_blog(LOG, DATA), disk_log:blog(LOG, DATA)).
+  -define(disk_log_sync(LOG), disk_log:sync(LOG)).
+  -define(DEFAULT_CALL_TIMEOUT, ?DEFAULT_LOGGER_CALL_TIMEOUT-2000).
+-endif.
+
+%%%-----------------------------------------------------------------
+%%% These macros enable statistics counters in the state of the
+%%% handler which is useful for analysing the overload protection
+%%% behaviour. These counters should not be included in code to be
+%%% officially released (as some counters will grow very large
+%%% over time).
+
+%%-define(SAVE_STATS, true).
+-ifdef(SAVE_STATS).
+  -define(merge_with_stats(STATE),
+          STATE#{flushes => 0, flushed => 0, drops => 0,
+                 casts => 0, calls => 0,
+                 max_qlen => 0, max_time => 0}).
+
+  -define(update_max_qlen(QLEN, STATE),
+          begin #{max_qlen := QLEN0} = STATE,
+                STATE#{max_qlen => ?max(QLEN0,QLEN)} end).
+
+  -define(update_calls_or_casts(CALL_OR_CAST, INC, STATE),
+          case CALL_OR_CAST of
+              cast ->
+                  #{casts := CASTS0} = STATE,
+                  STATE#{casts => CASTS0+INC};
+              call ->
+                  #{calls := CALLS0} = STATE,
+                  STATE#{calls => CALLS0+INC}
+          end).
+
+  -define(update_max_time(TIME, STATE),
+          begin #{max_time := TIME0} = STATE,
+                STATE#{max_time => ?max(TIME0,TIME)} end).
+
+  -define(update_other(OTHER, VAR, INCVAL, STATE),
+          begin #{OTHER := VAR} = STATE,
+                STATE#{OTHER => VAR+INCVAL} end).
+          
+-else.                                          % DEFAULT!
+  -define(merge_with_stats(STATE), STATE).
+  -define(update_max_qlen(_QLEN, STATE), STATE).
+  -define(update_calls_or_casts(_CALL_OR_CAST, _INC, STATE), STATE).
+  -define(update_max_time(_TIME, STATE), STATE).
+  -define(update_other(_OTHER, _VAR, _INCVAL, STATE), STATE).
+-endif.
+
+%%%-----------------------------------------------------------------
+%%% These macros enable callbacks that make it possible to analyse
+%%% the overload protection behaviour from outside the handler
+%%% process (including dropped requests on the client side).
+%%% An external callback module (?OBSERVER_MOD) is required which
+%%% is not part of the kernel application. For this reason, these
+%%% callbacks should not be included in code to be officially released.
+
+%%-define(OBSERVER_MOD, logger_test).
+-ifdef(OBSERVER_MOD).
+  -define(start_observation(NAME), ?OBSERVER:start_observation(NAME)).
+  -define(observe(NAME,EVENT), ?OBSERVER:observe(NAME,EVENT)).
+
+-else.                                          % DEFAULT!
+  -define(start_observation(_NAME), ok).
+  -define(observe(_NAME,_EVENT), ok).
+-endif.
+%%! <---
diff --git a/lib/kernel/src/logger_internal.hrl b/lib/kernel/src/logger_internal.hrl
new file mode 100644
index 0000000000..8fcaba8de6
--- /dev/null
+++ b/lib/kernel/src/logger_internal.hrl
@@ -0,0 +1,96 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-include_lib("kernel/include/logger.hrl").
+-define(LOGGER_TABLE,logger).
+-define(LOGGER_KEY,'$logger_config$').
+-define(HANDLER_KEY,'$handler_config$').
+-define(LOGGER_META_KEY,'$logger_metadata$').
+-define(STANDARD_HANDLER, logger_std_h).
+-define(DEFAULT_LOGGER_CALL_TIMEOUT, 10000).
+-define(DEFAULT_HANDLER_FILTERS,
+        ?DEFAULT_HANDLER_FILTERS([beam,erlang,otp])).
+-define(DEFAULT_HANDLER_FILTERS(Domain),
+        [{remote_gl,{fun logger_filters:remote_gl/2,stop}},
+         {domain,{fun logger_filters:domain/2,{log,prefix_of,Domain}}},
+         {no_domain,{fun logger_filters:domain/2,{log,no_domain,[]}}}]).
+-define(DEFAULT_FORMATTER,logger_formatter).
+-define(DEFAULT_FORMAT_CONFIG,#{legacy_header=>true,
+                                template=>?DEFAULT_FORMAT_TEMPLATE_HEADER}).
+-define(DEFAULT_FORMAT_TEMPLATE_HEADER,
+        [{logger_formatter,header},"\n",msg,"\n"]).
+-define(DEFAULT_FORMAT_TEMPLATE_SINGLE,
+        [time," ",level,": ",msg,"\n"]).
+-define(DEFAULT_FORMAT_TEMPLATE,
+        [time," ",level,":\n",msg,"\n"]).
+
+-define(LOG_INTERNAL(Level,Report),
+        case logger:allow(Level,?MODULE) of
+            true ->
+                _ = spawn(logger,macro_log,[?LOCATION,Level,Report,
+                                            logger:add_default_metadata(#{})]),
+                ok;
+            false ->
+                ok
+        end).
+
+%%%-----------------------------------------------------------------
+%%% Levels
+%%% Using same as syslog
+-define(LEVELS,[emergency,
+                alert,
+                critical,
+                error,
+                warning,
+                notice,
+                info,
+                debug]).
+-define(EMERGENCY,0).
+-define(ALERT,1).
+-define(CRITICAL,2).
+-define(ERROR,3).
+-define(WARNING,4).
+-define(NOTICE,5).
+-define(INFO,6).
+-define(DEBUG,7).
+
+-define(IS_LEVEL(L),
+        (L=:=emergency orelse
+            L=:=alert orelse
+            L=:=critical orelse
+            L=:=error orelse
+            L=:=warning orelse
+            L=:=notice orelse
+            L=:=info orelse
+            L=:=debug)).
+
+-define(IS_MSG(Msg),
+        ((is_tuple(Msg) andalso tuple_size(Msg)==2)
+         andalso
+           (is_list(element(1,Msg)) andalso is_list(element(2,Msg)))
+         orelse
+           (element(1,Msg)==report andalso ?IS_REPORT(element(2,Msg)))
+         orelse
+           (element(1,Msg)==string andalso ?IS_STRING(element(2,Msg))))).
+
+-define(IS_REPORT(Report),
+        (is_map(Report) orelse (is_list(Report) andalso is_tuple(hd(Report))))).
+
+-define(IS_STRING(String),
+        (is_list(String) orelse is_binary(String))).
diff --git a/lib/kernel/src/logger_server.erl b/lib/kernel/src/logger_server.erl
new file mode 100644
index 0000000000..6ef3b8582a
--- /dev/null
+++ b/lib/kernel/src/logger_server.erl
@@ -0,0 +1,440 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_server).
+
+-behaviour(gen_server).
+
+%% API
+-export([start_link/0,
+         add_handler/3, remove_handler/1,
+         add_filter/2, remove_filter/2,
+         set_module_level/2, reset_module_level/1,
+         cache_module_level/1,
+         set_config/2, set_config/3]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+         terminate/2]).
+
+-include("logger_internal.hrl").
+
+-define(SERVER, logger).
+
+-record(state, {tid}).
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+
+start_link() ->
+    gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
+
+add_handler(Id,Module,Config0) ->
+    case sanity_check(logger,handlers,[Id]) of
+        ok ->
+            try check_mod(Module) of
+                ok ->
+                    case sanity_check(Id,Config0) of
+                        ok ->
+                            Default = default_config(Id),
+                            Config = maps:merge(Default,Config0),
+                            call({add_handler,Id,Module,Config});
+                        Error ->
+                            Error
+                    end
+            catch throw:Error ->
+                    {error,Error}
+            end;
+        Error ->
+            Error
+    end.
+
+remove_handler(HandlerId) ->
+    call({remove_handler,HandlerId}).
+
+add_filter(Owner,Filter) ->
+    case sanity_check(Owner,filters,[Filter]) of
+        ok -> call({add_filter,Owner,Filter});
+        Error -> Error
+    end.
+
+remove_filter(Owner,FilterId) ->
+    call({remove_filter,Owner,FilterId}).
+
+set_module_level(Module,Level) when is_atom(Module) ->
+    case sanity_check(logger,level,Level) of
+        ok -> call({set_module_level,Module,Level});
+        Error -> Error
+    end;
+set_module_level(Module,_) ->
+    {error,{not_a_module,Module}}.
+
+reset_module_level(Module) when is_atom(Module) ->
+    call({reset_module_level,Module});
+reset_module_level(Module) ->
+    {error,{not_a_module,Module}}.
+
+cache_module_level(Module) ->
+    gen_server:cast(?SERVER,{cache_module_level,Module}).
+
+
+set_config(Owner,Key,Value) ->
+    case sanity_check(Owner,Key,Value) of
+        ok -> call({update_config,Owner,#{Key=>Value}});
+        Error -> Error
+    end.
+
+set_config(Owner,Config0) ->
+    case sanity_check(Owner,Config0) of
+        ok ->
+            Config = maps:merge(default_config(Owner),Config0),
+            call({set_config,Owner,Config});
+        Error ->
+            Error
+    end.
+
+%%%===================================================================
+%%% gen_server callbacks
+%%%===================================================================
+
+init([]) ->
+    process_flag(trap_exit, true),
+    Tid = logger_config:new(?LOGGER_TABLE),
+    LoggerConfig = maps:merge(default_config(logger),
+                              #{handlers=>[logger_simple]}),
+    logger_config:create(Tid,logger,LoggerConfig),
+    SimpleConfig0 = maps:merge(default_config(logger_simple),
+                               #{filter_default=>stop,
+                                 filters=>?DEFAULT_HANDLER_FILTERS,
+                                 logger_simple=>#{buffer=>true}}),
+    %% If this fails, then the node should crash
+    {ok,SimpleConfig} =
+        logger_simple:adding_handler(logger_simple,SimpleConfig0),
+    logger_config:create(Tid,logger_simple,logger_simple,SimpleConfig),
+    {ok, #state{tid=Tid}}.
+
+handle_call({add_handler,Id,Module,HConfig}, _From, #state{tid=Tid}=State) ->
+    Reply =
+        case logger_config:exist(Tid,Id) of
+            true ->
+                {error,{already_exist,Id}};
+            false ->
+                %% inform the handler
+                case call_h(Module,adding_handler,[Id,HConfig],{ok,HConfig}) of
+                    {ok,HConfig1} ->
+                        logger_config:create(Tid,Id,Module,HConfig1),
+                        {ok,Config} = do_get_config(Tid,logger),
+                        Handlers = maps:get(handlers,Config,[]),
+                        do_set_config(Tid,logger,
+                                      Config#{handlers=>[Id|Handlers]}),
+                        ok;
+                    {error,HReason} ->
+                        {error,{handler_not_added,HReason}}
+                end
+        end,
+    {reply,Reply,State};
+handle_call({remove_handler,HandlerId}, _From, #state{tid=Tid}=State) ->
+    Reply =
+        case logger_config:get(Tid,HandlerId) of
+            {ok,{Module,_}} ->
+                {ok,Config} = do_get_config(Tid,logger),
+                Handlers0 = maps:get(handlers,Config,[]),
+                Handlers = lists:delete(HandlerId,Handlers0),
+                %% inform the handler
+                _ = call_h(Module,removing_handler,[HandlerId],ok),
+                do_set_config(Tid,logger,Config#{handlers=>Handlers}),
+                logger_config:delete(Tid,HandlerId),
+                ok;
+            _ ->
+                {error,{not_found,HandlerId}}
+        end,
+    {reply,Reply,State};
+handle_call({add_filter,Id,Filter}, _From,#state{tid=Tid}=State) ->
+    Reply = do_add_filter(Tid,Id,Filter),
+    {reply,Reply,State};
+handle_call({remove_filter,Id,FilterId}, _From, #state{tid=Tid}=State) ->
+    Reply = do_remove_filter(Tid,Id,FilterId),
+    {reply,Reply,State};
+handle_call({update_config,Id,NewConfig}, _From, #state{tid=Tid}=State) ->
+    Reply =
+        case logger_config:get(Tid,Id) of
+            {ok,{Module,OldConfig}} ->
+                Config = maps:merge(OldConfig,NewConfig),
+                case call_h(Module,changing_config,[Id,OldConfig,Config],
+                            {ok,Config}) of
+                    {ok,Config1} ->
+                        do_set_config(Tid,Id,Config1);
+                    Error ->
+                        Error
+                end;
+            {ok,OldConfig} ->
+                Config = maps:merge(OldConfig,NewConfig),
+                do_set_config(Tid,Id,Config);
+            Error ->
+                Error
+        end,
+    {reply,Reply,State};
+handle_call({set_config,logger,Config}, _From, #state{tid=Tid}=State) ->
+    Reply = do_set_config(Tid,logger,Config),
+    {reply,Reply,State};
+handle_call({set_config,HandlerId,Config}, _From, #state{tid=Tid}=State) ->
+    Reply =
+        case logger_config:get(Tid,HandlerId) of
+            {ok,{Module,OldConfig}} ->
+                case call_h(Module,changing_config,[HandlerId,OldConfig,Config],
+                            {ok,Config}) of
+                    {ok,Config1} ->
+                        do_set_config(Tid,HandlerId,Config1);
+                    Error ->
+                        Error
+                end;
+            _ ->
+                {error,{not_found,HandlerId}}
+        end,
+    {reply,Reply,State};
+handle_call({set_module_level,Module,Level}, _From, #state{tid=Tid}=State) ->
+    Reply = logger_config:set_module_level(Tid,Module,Level),
+    {reply,Reply,State};
+handle_call({reset_module_level,Module}, _From, #state{tid=Tid}=State) ->
+    Reply = logger_config:reset_module_level(Tid,Module),
+    {reply,Reply,State}.
+
+handle_cast({cache_module_level,Module}, #state{tid=Tid}=State) ->
+    logger_config:cache_module_level(Tid,Module),
+    {noreply, State}.
+
+%% Interface for those who can't call the API - e.g. the emulator, or
+%% places related to code loading.
+%%
+%% This can also be log events from remote nodes which are sent from
+%% logger.erl when the group leader of the client process is on a
+%% same node as the client process itself.
+handle_info({log,Level,Format,Args,Meta}, State) ->
+    logger:log(Level,Format,Args,Meta),
+    {noreply, State};
+handle_info({log,Level,Report,Meta}, State) ->
+    logger:log(Level,Report,Meta),
+    {noreply, State};
+handle_info({Ref,_Reply},State) when is_reference(Ref) ->
+    %% Assuming this is a timed-out gen_server reply - ignoring
+    {noreply, State}.
+
+terminate(_Reason, _State) ->
+    ok.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+call(Request) ->
+    case whereis(?SERVER) of
+        Pid when Pid==self() ->
+            {error,{attempting_syncronous_call_to_self,Request}};
+        _ ->
+            gen_server:call(?SERVER,Request,?DEFAULT_LOGGER_CALL_TIMEOUT)
+    end.
+
+do_add_filter(Tid,Id,{FId,_} = Filter) ->
+    case do_get_config(Tid,Id) of
+        {ok,Config} ->
+            Filters = maps:get(filters,Config,[]),
+            case lists:keymember(FId,1,Filters) of
+                true ->
+                    {error,{already_exist,FId}};
+                false ->
+                    do_set_config(Tid,Id,Config#{filters=>[Filter|Filters]})
+            end;
+        Error ->
+            Error
+    end.
+
+do_remove_filter(Tid,Id,FilterId) ->
+    case do_get_config(Tid,Id) of
+        {ok,Config} ->
+            Filters0 = maps:get(filters,Config,[]),
+            case lists:keytake(FilterId,1,Filters0) of
+                {value,_,Filters} ->
+                    do_set_config(Tid,Id,Config#{filters=>Filters});
+                false ->
+                    {error,{not_found,FilterId}}
+            end;
+        Error ->
+            Error
+    end.
+
+do_get_config(Tid,Id) ->
+    case logger_config:get(Tid,Id) of
+        {ok,{_,Config}} ->
+            {ok,Config};
+        {ok,Config} ->
+            {ok,Config};
+        Error ->
+            Error
+    end.
+
+do_set_config(Tid,Id,Config) ->
+    logger_config:set(Tid,Id,Config),
+    ok.
+
+default_config(logger) ->
+    #{level=>info,
+      filters=>[],
+      filter_default=>log,
+      handlers=>[]};
+default_config(_) ->
+    #{level=>info,
+      filters=>[],
+      filter_default=>log,
+      formatter=>{?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}}.
+
+sanity_check(Owner,Key,Value) ->
+    sanity_check_1(Owner,[{Key,Value}]).
+
+sanity_check(HandlerId,Config) when is_map(Config) ->
+    sanity_check_1(HandlerId,maps:to_list(Config));
+sanity_check(_,Config) ->
+    {error,{invalid_handler_config,Config}}.
+
+sanity_check_1(Owner,Config) when is_list(Config) ->
+    try
+        Type = get_type(Owner),
+        check_config(Type,Config)
+    catch throw:Error -> {error,Error}
+    end.
+
+get_type(logger) ->
+    logger;
+get_type(Id) ->
+    check_id(Id),
+    handler.
+
+check_config(Owner,[{level,Level}|Config]) ->
+    check_level(Level),
+    check_config(Owner,Config);
+check_config(logger,[{handlers,Handlers}|Config]) ->
+    check_handlers(Handlers),
+    check_config(logger,Config);
+check_config(Owner,[{filters,Filters}|Config]) ->
+    check_filters(Filters),
+    check_config(Owner,Config);
+check_config(Owner,[{filter_default,FD}|Config]) ->
+    check_filter_default(FD),
+    check_config(Owner,Config);
+check_config(handler,[{formatter,Formatter}|Config]) ->
+    check_formatter(Formatter),
+    check_config(handler,Config);
+check_config(logger,[C|_]) ->
+    throw({invalid_logger_config,C});
+check_config(handler,[{_,_}|Config]) ->
+    %% Arbitrary config elements are allowed for handlers
+    check_config(handler,Config);
+check_config(_,[]) ->
+    ok.
+
+check_id(Id) when is_atom(Id) ->
+    ok;
+check_id(Id) ->
+    throw({invalid_id,Id}).
+
+check_mod(Mod) when is_atom(Mod) ->
+    ok;
+check_mod(Mod) ->
+    throw({invalid_module,Mod}).
+
+check_level({LevelInt,cached}) when LevelInt>=?EMERGENCY, LevelInt=<?DEBUG ->
+    ok;
+check_level(Level) ->
+    case lists:member(Level,?LEVELS) of
+        true ->
+            ok;
+        false ->
+            throw({invalid_level,Level})
+    end.
+
+check_handlers([Id|Handlers]) ->
+    check_id(Id),
+    check_handlers(Handlers);
+check_handlers([]) ->
+    ok;
+check_handlers(Handlers) ->
+    throw({invalid_handlers,Handlers}).
+
+check_filters([{Id,{Fun,_Args}}|Filters]) when is_atom(Id), is_function(Fun,2) ->
+    check_filters(Filters);
+check_filters([Filter|_]) ->
+    throw({invalid_filter,Filter});
+check_filters([]) ->
+    ok;
+check_filters(Filters) ->
+    throw({invalid_filters,Filters}).
+
+check_filter_default(FD) when FD==stop; FD==log ->
+    ok;
+check_filter_default(FD) ->
+    throw({invalid_filter_default,FD}).
+
+check_formatter({logger_formatter,Config}) when is_map(Config) ->
+    check_logger_formatter_config(maps:to_list(Config));
+check_formatter({logger_formatter,Config}) ->
+    throw({invalid_formatter_config,Config});
+check_formatter({Mod,_}) ->
+    %% no knowledge of other formatters
+    check_mod(Mod);
+check_formatter(Formatter) ->
+    throw({invalid_formatter,Formatter}).
+
+
+check_logger_formatter_config([{template,T}|Config]) when is_list(T) ->
+    case lists:all(fun(X) when is_atom(X) -> true;
+                      (X) when is_tuple(X), is_atom(element(1,X)) -> true;
+                      (X) when is_list(X) -> io_lib:printable_unicode_list(X);
+                      (_) -> false
+                   end,
+                   T) of
+        true ->
+            check_logger_formatter_config(Config);
+        false ->
+            throw({invalid_formatter_template,T})
+    end;
+check_logger_formatter_config([{legacy_header,LH}|Config]) when is_boolean(LH) ->
+    check_logger_formatter_config(Config);
+check_logger_formatter_config([{single_line,SL}|Config]) when is_boolean(SL) ->
+    check_logger_formatter_config(Config);
+check_logger_formatter_config([{utc,Utc}|Config]) when is_boolean(Utc) ->
+    check_logger_formatter_config(Config);
+check_logger_formatter_config([C|_]) ->
+    throw({invalid_formatter_config,C});
+check_logger_formatter_config([]) ->
+    ok.
+
+call_h(Module, Function, Args, DefRet) ->
+    %% Not calling code:ensure_loaded + erlang:function_exported here,
+    %% since in some rare terminal cases, the code_server might not
+    %% exist and we'll get a deadlock in removing the handler.
+    try apply(Module, Function, Args)
+    catch
+        C:R:S ->
+            case {C,R,S} of
+                {error,undef,[{Module,Function,Args,_}|_]} ->
+                    DefRet;
+                _ ->
+                    {error,{callback_crashed,
+                            {C,R,logger:filter_stacktrace(?MODULE,S)}}}
+            end
+    end.
diff --git a/lib/kernel/src/logger_simple.erl b/lib/kernel/src/logger_simple.erl
new file mode 100644
index 0000000000..61387ac7c9
--- /dev/null
+++ b/lib/kernel/src/logger_simple.erl
@@ -0,0 +1,238 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_simple).
+
+-export([adding_handler/2, removing_handler/1, log/2]).
+-export([get_buffer/0]).
+
+%% This module implements a simple handler for logger. It is the
+%% default used during system start.
+
+%%%-----------------------------------------------------------------
+%%% API
+get_buffer() ->
+    case whereis(?MODULE) of
+        undefined ->
+            {error,noproc};
+        Pid ->
+            Ref = erlang:monitor(process,Pid),
+            Pid ! {get_buffer,self()},
+            receive
+                {buffer,Buffer} ->
+                    erlang:demonitor(Ref,[flush]),
+                    {ok,Buffer};
+                {'DOWN',Ref,process,Pid,Reason} ->
+                    {error,Reason}
+            end
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Logger callback
+
+adding_handler(?MODULE,Config) ->
+    Me = self(),
+    case whereis(?MODULE) of
+        undefined ->
+            {Pid,Ref} = spawn_opt(fun() -> init(Me,Config) end,
+                                  [link,monitor,{message_queue_data,off_heap}]),
+            receive
+                {'DOWN',Ref,process,Pid,Reason} ->
+                    {error,Reason};
+                {Pid,started} ->
+                    erlang:demonitor(Ref),
+                    {ok,Config}
+            end;
+        _ ->
+            {error,{handler_process_name_already_exists,?MODULE}}
+    end.
+
+removing_handler(?MODULE) ->
+    case whereis(?MODULE) of
+        undefined ->
+            ok;
+        Pid ->
+            Ref = erlang:monitor(process,Pid),
+            unlink(Pid),
+            Pid ! stop,
+            receive {'DOWN',Ref,process,Pid,_} ->
+                    ok
+            end
+    end.
+
+log(#{meta:=#{error_logger:=#{tag:=info_report,type:=Type}}},_Config)
+  when Type=/=std_info ->
+    %% Skip info reports that are not 'std_info' (ref simple logger in
+    %% error_logger)
+    ok;
+log(#{msg:=_,meta:=#{time:=_}}=Log,_Config) ->
+    _ = case whereis(?MODULE) of
+            undefined ->
+                %% Is the node on the way down? Real emergency?
+                %% Log directly from client just to get it out
+                do_log(
+                  #{level=>error,
+                    msg=>{report,{error,simple_handler_process_dead}},
+                    meta=>#{time=>erlang:monotonic_time(microsecond)}}),
+                do_log(Log);
+            _ ->
+                ?MODULE ! {log,Log}
+        end,
+    ok;
+log(_,_) ->
+    %% Unexpected log.
+    %% We don't want to crash the simple logger, so ignore this.
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Process
+init(Starter,Config) ->
+    register(?MODULE,self()),
+    Starter ! {self(),started},
+    BufferSize =
+        case Config of
+            #{?MODULE:=#{buffer:=true}} ->
+                10;
+            _ ->
+                infinity
+        end,
+    loop(#{buffer_size=>BufferSize,dropped=>0,buffer=>[]},infinity).
+
+loop(Buffer,Timeout) ->
+    receive
+        stop ->
+            ok;
+        {get_buffer,From} ->
+            loop(Buffer#{send_to=>From},0);
+        {log,#{msg:=_,meta:=#{time:=_}}=Log} ->
+            do_log(Log),
+            loop(update_buffer(Buffer,Log),Timeout);
+        _ ->
+            %% Unexpected message - flush it!
+            loop(Buffer,Timeout)
+    after Timeout ->
+            #{dropped:=D,buffer:=B,send_to:=Pid} = Buffer,
+            LogList = lists:reverse(B) ++ drop_msg(D),
+            Pid ! {buffer,LogList},
+            loop(Buffer#{buffer_size=>infinity,
+                         dropped=>0,
+                         buffer=>[],
+                         send_to=>false},
+                 infinity)
+    end.
+
+update_buffer(#{buffer_size:=infinity}=Buffer,_Log) ->
+    Buffer;
+update_buffer(#{buffer_size:=0,dropped:=D}=Buffer,_Log) ->
+    Buffer#{dropped=>D+1};
+update_buffer(#{buffer_size:=S,buffer:=B}=Buffer,Log) ->
+    Buffer#{buffer_size=>S-1,buffer=>[Log|B]}.
+
+drop_msg(0) ->
+    [];
+drop_msg(N) ->
+    [#{level=>info,
+       msg=>{"Simple handler buffer full, dropped ~w messages",[N]},
+       meta=>#{time=>erlang:monotonic_time(microsecond)}}].
+
+%%%-----------------------------------------------------------------
+%%% Internal
+
+%% Can't do io_lib:format
+
+do_log(#{msg:={report,Report},
+         meta:=#{time:=T,error_logger:=#{type:=Type}}}) ->
+    display_date(T),
+    display_report(Type,Report);
+do_log(#{msg:=Msg,meta:=#{time:=T}}) ->
+    %% Maybe buffer event - if next handler shall be able to
+    %%  re-display it
+    display_date(T),
+    display(Msg).
+
+display_date(Timestamp0) when is_integer(Timestamp0) ->
+    Timestamp = Timestamp0 + erlang:time_offset(microsecond),
+    Micro = Timestamp rem 1000000,
+    Sec = Timestamp div 1000000,
+    {{Y,Mo,D},{H,Mi,S}} = erlang:universaltime_to_localtime(
+                            erlang:posixtime_to_universaltime(Sec)),
+    erlang:display_string(
+      integer_to_list(Y) ++ "-" ++
+	  pad(Mo,2) ++ "-" ++
+	  pad(D,2)  ++ " " ++
+	  pad(H,2)  ++ ":" ++
+	  pad(Mi,2) ++ ":" ++
+	  pad(S,2)  ++ "." ++
+          pad(Micro,6) ++ " ").
+
+pad(Int,Size) when is_integer(Int) ->
+    pad(integer_to_list(Int),Size);
+pad(Str,Size) when length(Str)==Size ->
+    Str;
+pad(Str,Size) ->
+    pad([$0|Str],Size).
+
+display({string,Chardata}) ->
+    try unicode:characters_to_list(Chardata) of
+        String -> erlang:display_string(String), erlang:display_string("\n")
+    catch _:_ -> erlang:display(Chardata)
+    end;
+display({report,Report}) when is_map(Report) ->
+    display_report(maps:to_list(Report));
+display({report,Report}) ->
+    display_report(Report);
+display({F, A}) when is_list(F), is_list(A) ->
+    erlang:display_string(F ++ "\n"),
+    [begin
+	 erlang:display_string("\t"),
+	 erlang:display(Arg)
+     end || Arg <- A],
+    ok.
+
+display_report(Atom, A) when is_atom(Atom) ->
+    %% The widest atom seems to be 'supervisor_report' at 17.
+    ColumnWidth = 20,
+    AtomString = atom_to_list(Atom),
+    AtomLength = length(AtomString),
+    Padding = lists:duplicate(ColumnWidth - AtomLength, $\s),
+    erlang:display_string(AtomString ++ Padding),
+    display_report(A);
+display_report(F, A) ->
+    erlang:display({F, A}).
+
+display_report([A, []]) ->
+    %% Special case for crash reports when process has no links
+    display_report(A);
+display_report(A = [_|_]) ->
+    case lists:all(fun({Key,_Value}) -> is_atom(Key); (_) -> false end, A) of
+	true ->
+	    erlang:display_string("\n"),
+	    lists:foreach(
+	      fun({Key, Value}) ->
+		      erlang:display_string(
+			"    " ++
+			    atom_to_list(Key) ++
+			    ": "),
+		      erlang:display(Value)
+	      end, A);
+	false ->
+	    erlang:display(A)
+    end;
+display_report(A) ->
+    erlang:display(A).
diff --git a/lib/kernel/src/logger_std_h.erl b/lib/kernel/src/logger_std_h.erl
new file mode 100644
index 0000000000..cbc9db372c
--- /dev/null
+++ b/lib/kernel/src/logger_std_h.erl
@@ -0,0 +1,799 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_std_h).
+
+-behaviour(gen_server).
+
+-include("logger.hrl").
+-include("logger_internal.hrl").
+-include("logger_h_common.hrl").
+
+-include_lib("kernel/include/file.hrl").
+
+%% API
+-export([start_link/3, info/1, filesync/1, reset/1]).
+
+%% gen_server and proc_lib callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+         terminate/2, code_change/3]).
+
+%% logger callbacks
+-export([log/2, adding_handler/2, removing_handler/1,
+         changing_config/3, swap_buffer/2]).
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+
+%%%-----------------------------------------------------------------
+%%% Start a standard handler process and link to caller.
+%%% This function is called by the kernel supervisor when this
+%%% handler process gets added
+-spec start_link(Name, Config, HandlerState) -> {ok,Pid} | {error,Reason} when
+      Name :: atom(),
+      Config :: logger:config(),
+      HandlerState :: map(),
+      Pid :: pid(),
+      Reason :: term().
+
+start_link(Name, Config, HandlerState) ->
+    proc_lib:start_link(?MODULE,init,[[Name,Config,HandlerState]]).
+
+%%%-----------------------------------------------------------------
+%%%
+-spec filesync(Name) -> ok | {error,Reason} when
+      Name :: atom(),
+      Reason :: handler_busy | {badarg,term()}.
+
+filesync(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, filesync, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;
+filesync(Name) ->
+    {error,{badarg,{filesync,[Name]}}}.
+
+%%%-----------------------------------------------------------------
+%%%
+-spec info(Name) -> Info | {error,Reason} when
+      Name :: atom(),
+      Info :: term(),
+      Reason :: handler_busy | {badarg,term()}.
+
+info(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, info, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;
+info(Name) ->
+    {error,{badarg,{info,[Name]}}}.
+
+%%%-----------------------------------------------------------------
+%%%
+-spec reset(Name) -> ok | {error,Reason} when
+      Name :: atom(),
+      Reason :: handler_busy | {badarg,term()}.
+
+reset(Name) when is_atom(Name) ->
+    try
+        gen_server:call(Name, reset, ?DEFAULT_CALL_TIMEOUT)
+    catch
+        _:{timeout,_} -> {error,handler_busy}
+    end;      
+reset(Name) ->
+    {error,{badarg,{reset,[Name]}}}.
+
+
+%%%===================================================================
+%%% logger callbacks
+%%%===================================================================
+
+%%%-----------------------------------------------------------------
+%%% Handler being added
+adding_handler(Name, Config) ->
+    case check_config(adding, Name, Config) of
+        {ok, Config1} ->
+            %% create initial handler state by merging defaults with config
+            HConfig = maps:get(?MODULE, Config1, #{}),
+            HState = maps:merge(get_init_state(), HConfig),
+            case logger_h_common:overload_levels_ok(HState) of
+                true ->
+                    case start(Name, Config1, HState) of
+                        ok ->
+                            %% Make sure wait_for_buffer is not stored, so we
+                            %% won't hang and wait for buffer on a restart
+                            {ok, maps:remove(wait_for_buffer,Config1)};
+                        Error ->
+                            Error
+                    end;
+                false ->
+                    #{toggle_sync_qlen   := TSQL,
+                      drop_new_reqs_qlen := DNRQL,
+                      flush_reqs_qlen    := FRQL} = HState, 
+                    {error,{invalid_levels,{TSQL,DNRQL,FRQL}}}
+            end;
+        Error ->
+            Error
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Updating handler config
+changing_config(Name,
+                OldConfig=#{id:=Id, ?MODULE:=#{type:=Type}},
+                NewConfig=#{id:=Id}) ->
+    MyConfig = maps:get(?MODULE, NewConfig, #{}),
+    case maps:get(type, MyConfig, Type) of
+        Type ->
+            MyConfig1 = MyConfig#{type=>Type},
+            changing_config1(Name, OldConfig,
+                             NewConfig#{?MODULE=>MyConfig1});
+        _ ->
+            {error,{illegal_config_change,OldConfig,NewConfig}}
+    end;
+changing_config(_Name, OldConfig, NewConfig) ->
+    {error,{illegal_config_change,OldConfig,NewConfig}}.
+
+changing_config1(Name, OldConfig, NewConfig) ->
+    case check_config(changing, Name, NewConfig) of
+        Result = {ok,NewConfig1} ->
+            try gen_server:call(Name, {change_config,OldConfig,NewConfig1},
+                                ?DEFAULT_CALL_TIMEOUT) of
+                ok      -> Result;
+                HError  -> HError
+            catch
+                _:{timeout,_} -> {error,handler_busy}
+            end;
+        Error ->
+            Error
+    end.    
+
+check_config(adding, Name, Config0) ->
+    %% Merge in defaults on top level
+    Config = maps:merge(#{id => Name}, Config0),
+    %% Merge in defaults on handler level
+    MyConfig0 = maps:get(?MODULE, Config, #{}),
+    MyConfig = maps:merge(#{type => standard_io},
+                          MyConfig0),
+    case check_my_config(maps:to_list(MyConfig)) of
+        ok ->
+            {ok,Config#{?MODULE=>MyConfig}};
+        Error ->
+            Error
+    end;
+check_config(changing, _Name, Config) ->
+    MyConfig = maps:get(?MODULE, Config, #{}),
+    case check_my_config(maps:to_list(MyConfig)) of
+        ok    -> {ok,Config};
+        Error -> Error
+    end.
+
+check_my_config([{type,Type} | Config]) when Type == standard_io;
+                                             Type == standard_error ->
+    check_my_config(Config);
+check_my_config([{type,{file,File}} | Config]) when is_list(File) ->
+    check_my_config(Config);
+check_my_config([{type,{file,File,Modes}} | Config]) when is_list(File),
+                                                          is_list(Modes) ->
+    check_my_config(Config);
+check_my_config([Other | Config]) ->
+    case logger_h_common:check_common_config(Other) of
+        valid ->
+            check_my_config(Config);
+        invalid ->
+            {error,{invalid_config,?MODULE,Other}}
+    end;
+check_my_config([]) ->
+    ok.
+
+
+%%%-----------------------------------------------------------------
+%%% Handler being removed
+removing_handler(Name) ->
+    stop(Name).
+
+%%%-----------------------------------------------------------------
+%%% Get buffer when swapping from simple handler
+swap_buffer(Name,Buffer) ->
+    case whereis(Name) of
+        undefined ->
+            ok;
+        _ ->
+            Name ! {buffer,Buffer}
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Log a string or report
+-spec log(Log, Config) -> ok | dropped when
+      Log :: logger:log(),
+      Config :: logger:config().
+
+log(Log,Config=#{id:=Name}) ->
+    %% if the handler has crashed, we must drop this request
+    %% and hope the handler restarts so we can try again
+    true = is_pid(whereis(Name)),
+    Bin = logger_h_common:log_to_binary(Log,Config),
+    logger_h_common:call_cast_or_drop(Name, Bin).
+
+%%%===================================================================
+%%% gen_server callbacks
+%%%===================================================================
+
+init([Name, Config,
+      State0 = #{type := Type, file_ctrl_sync_int := FileCtrlSyncInt}]) ->
+    register(Name, self()),
+    process_flag(trap_exit, true),
+    process_flag(message_queue_data, off_heap),
+
+    ?init_test_hooks(),
+    ?start_observation(Name),
+
+    case do_init(Name, Type) of
+        {ok,InitState} ->
+            catch ets:new(Name, [public, named_table]),
+            ?set_mode(Name, async),
+            State = maps:merge(State0, InitState),
+            T0 = ?timestamp(),
+            State1 =
+                ?merge_with_stats(State#{mode => async,
+                                         file_ctrl_sync => FileCtrlSyncInt,
+                                         last_qlen => 0,
+                                         last_log_ts => T0,
+                                         burst_win_ts => T0,
+                                         burst_msg_count => 0}),
+            proc_lib:init_ack({ok,self()}),
+            gen_server:cast(self(), {repeated_filesync,T0}),
+            enter_loop(Config, State1);
+        Error ->
+            logger_h_common:error_notify({init_handler,Name,Error}),
+            proc_lib:init_ack(Error)
+    end.
+
+do_init(Name, Std) when Std=:=standard_io; Std=:=standard_error ->
+    case open_log_file(Name, Std) of
+        {ok,FileCtrlPid} ->
+            {ok,#{id=>Name,type=>Std,file_ctrl_pid=>FileCtrlPid}};
+        Error ->
+            Error
+    end;
+do_init(Name, FileInfo) when is_tuple(FileInfo) ->
+    case open_log_file(Name, FileInfo) of
+        {ok,FileCtrlPid} ->
+            {ok,#{id=>Name,type=>FileInfo,file_ctrl_pid=>FileCtrlPid}};
+        Error ->
+            Error
+    end.
+
+enter_loop(#{wait_for_buffer:=true}=Config,State) ->
+    State1 =
+        receive
+            {buffer,Buffer} ->
+                lists:foldl(
+                  fun(Log,S) ->
+                          Bin = logger_h_common:log_to_binary(Log,Config),
+                          {_,S1} = do_log(Bin,cast,S),
+                          S1
+                  end,
+                  State,
+                  Buffer)
+        end,
+    gen_server:enter_loop(?MODULE,[],State1);
+enter_loop(_Config,State) ->
+    gen_server:enter_loop(?MODULE,[],State).
+
+%% This is the synchronous log request.
+handle_call({log, Bin}, _From, State) ->
+    {Result,State1} = do_log(Bin, call, State),
+    %% Result == ok | dropped
+    {reply,Result, State1};
+
+handle_call(filesync, _From, State = #{type := Type,
+                                       file_ctrl_pid := FileCtrlPid}) ->
+    if is_atom(Type) ->
+            {reply, ok, State};
+       true ->
+            {reply, file_ctrl_filesync_sync(FileCtrlPid), State}
+    end;
+
+handle_call({change_config,_OldConfig,NewConfig}, _From,
+            State = #{filesync_repeat_interval := FSyncInt0,
+                      last_log_ts := LastLogTS}) ->
+    HConfig = maps:get(?MODULE, NewConfig, #{}),
+    State1 = maps:merge(State, HConfig),
+    case logger_h_common:overload_levels_ok(State1) of
+        true ->
+            _ =
+                case maps:get(filesync_repeat_interval, HConfig, undefined) of
+                    undefined ->
+                        ok;
+                    no_repeat ->
+                        _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref,
+                                                                  State,
+                                                                  undefined));
+                    FSyncInt0 ->
+                        ok;
+                    _FSyncInt1 ->
+                        _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref,
+                                                                  State,
+                                                                  undefined)),
+                        gen_server:cast(self(), {repeated_filesync,
+                                                 LastLogTS})
+                end,
+            {reply, ok, State1};
+        false ->
+            #{toggle_sync_qlen   := TSQL,
+              drop_new_reqs_qlen := DNRQL,
+              flush_reqs_qlen    := FRQL} = State1,
+            {reply, {error,{invalid_levels,{TSQL,DNRQL,FRQL}}}, State}
+    end;
+
+handle_call(info, _From, State) ->
+    {reply, State, State};
+
+handle_call(reset, _From, State) ->
+    State1 = ?merge_with_stats(State),
+    {reply, ok, State1#{last_qlen => 0,
+                        last_log_ts => ?timestamp()}};
+
+handle_call(stop, _From, State) ->
+    {stop, {shutdown,stopped}, ok, State}.
+
+%% This is the asynchronous log request.
+handle_cast({log, Bin}, State) ->
+    {_,State1} = do_log(Bin, cast, State),
+    {noreply, State1};
+
+%% If FILESYNC_REPEAT_INTERVAL is set to a millisec value, this
+%% clause gets called repeatedly by the handler. In order to
+%% guarantee that a filesync *always* happens after the last log
+%% request, the repeat operation must be active!
+handle_cast({repeated_filesync,LastLogTS0},
+            State = #{type := Type,
+                      file_ctrl_pid := FileCtrlPid,
+                      filesync_repeat_interval := FSyncInt,
+                      last_log_ts := LastLogTS1}) ->
+    State1 =
+        if not is_atom(Type), is_integer(FSyncInt) ->
+                %% only do filesync if something has been
+                %% written since last time we checked
+                if LastLogTS1 == LastLogTS0 ->
+                        ok;
+                   true ->
+                        file_ctrl_filesync_async(FileCtrlPid)
+                end,
+                {ok,TRef} =
+                    timer:apply_after(FSyncInt, gen_server,cast,
+                                      [self(),{repeated_filesync,LastLogTS1}]),
+                State#{rep_sync_tref => TRef};
+           true ->
+                State
+        end,
+    {noreply,State1}.
+
+handle_info({'EXIT',Pid,Why}, State = #{id := Name, type := FileInfo}) ->
+    case maps:get(file_ctrl_pid, State, undefined) of
+        Pid ->
+            %% file error, terminate handler
+            logger_h_common:handler_exit(Name,
+                                         {error,{write_failed,FileInfo,Why}});
+        _Other ->
+            %% ignore EXIT
+            ok
+    end,
+    {noreply, State};
+
+handle_info(_Info, State) ->
+    {noreply, State}.
+
+terminate(Reason, State = #{id:=Name, file_ctrl_pid:=FWPid,
+                            type:=_FileInfo}) ->
+    _ = logger_h_common:cancel_timer(maps:get(rep_sync_tref, State,
+                                              undefined)),
+    case is_process_alive(FWPid) of
+        true ->
+            unlink(FWPid),
+            _ = file_ctrl_stop(FWPid),
+            MRef = erlang:monitor(process, FWPid),
+            receive
+                {'DOWN',MRef,_,_,_} ->
+                    ok
+            after
+                ?DEFAULT_CALL_TIMEOUT ->
+                    exit(FWPid, kill)
+            end;
+        false ->
+            ok
+    end,
+    logger_h_common:stop_or_restart(Name, Reason, State).
+                                                  
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+
+%%%-----------------------------------------------------------------
+%%%
+get_init_state() ->
+     #{toggle_sync_qlen           => ?TOGGLE_SYNC_QLEN,
+       drop_new_reqs_qlen         => ?DROP_NEW_REQS_QLEN,
+       flush_reqs_qlen            => ?FLUSH_REQS_QLEN,
+       enable_burst_limit         => ?ENABLE_BURST_LIMIT,
+       burst_limit_size           => ?BURST_LIMIT_SIZE,
+       burst_window_time          => ?BURST_WINDOW_TIME,
+       enable_kill_overloaded     => ?ENABLE_KILL_OVERLOADED,
+       handler_overloaded_qlen    => ?HANDLER_OVERLOADED_QLEN,
+       handler_overloaded_mem     => ?HANDLER_OVERLOADED_MEM,
+       handler_restart_after      => ?HANDLER_RESTART_AFTER,
+       file_ctrl_sync_int         => ?CONTROLLER_SYNC_INTERVAL,
+       filesync_ok_qlen           => ?FILESYNC_OK_QLEN,
+       filesync_repeat_interval   => ?FILESYNC_REPEAT_INTERVAL}.
+
+%%%-----------------------------------------------------------------
+%%% Add a standard handler to the logger.
+%%% This starts a dedicated handler process which should always
+%%% exist if the handler is registered with logger (and should not
+%%% exist if the handler is not registered).
+%%%
+%%% Handler specific config should be provided with a sub map associated
+%%% with a key named the same as this module, e.g:
+%%%
+%%% Config = #{logger_std_h => #{toggle_sync_qlen => 50}
+%%%
+%%% The standard handler process is linked to logger_sup, which is
+%%% part of the kernel application's supervision tree.
+start(Name, Config, HandlerState) ->
+    LoggerStdH =
+        #{id       => Name,
+          start    => {?MODULE, start_link, [Name,Config,HandlerState]},
+          restart  => temporary,
+          shutdown => 2000,
+          type     => worker,
+          modules  => [?MODULE]},
+    case supervisor:start_child(logger_sup, LoggerStdH) of
+        {ok,_Pid} ->
+            ok;
+        Error ->
+            Error
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Stop and remove the handler.
+stop(Name) ->
+    case whereis(Name) of
+        undefined ->
+            ok;
+        _ ->
+            %% We don't want to do supervisor:terminate_child here
+            %% since we need to distinguish this explicit stop from a
+            %% system termination in order to avoid circular attempts
+            %% at removing the handler (implying deadlocks and
+            %% timeouts).
+            _ = gen_server:call(Name,stop),
+            _ = supervisor:delete_child(logger_sup, Name),
+            ok
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Logging and overload control.
+-define(update_file_ctrl_sync(C, Interval),
+        if C == 0 -> Interval;
+           true -> C-1 end).
+
+%% check for overload between every request (and set Mode to async,
+%% sync or drop accordingly), but never flush the whole mailbox
+%% before LogWindowSize requests have been handled
+do_log(Bin, CallOrCast, State = #{id:=Name}) ->
+    T1 = ?timestamp(),
+
+    %% check if the handler is getting overloaded, or if it's
+    %% recovering from overload (the check must be done for each
+    %% request to react quickly to large bursts of requests and
+    %% to ensure that the handler can never end up in drop mode
+    %% with an empty mailbox, which would stop operation)
+    {Mode1,QLen,Mem,State1} = logger_h_common:check_load(State),
+
+    %% kill the handler if it can't keep up with the load
+    logger_h_common:kill_if_choked(Name, QLen, Mem, State),
+
+    if Mode1 == flush ->
+            flush(Name, QLen, T1, State1);
+       true ->
+            write(Name, Mode1, T1, Bin, CallOrCast, State1)
+    end.
+
+%% this clause is called by do_log/3 after an overload check
+%% has been performed, where QLen > FlushQLen
+flush(Name, _QLen0, T1, State=#{last_log_ts := _T0}) ->
+    %% flush messages in the mailbox (a limited number in
+    %% order to not cause long delays)
+    _NewFlushed = logger_h_common:flush_log_requests(?FLUSH_MAX_N),
+
+    %% because of the receive loop when flushing messages, the
+    %% handler will be scheduled out often and the mailbox could
+    %% grow very large, so we'd better check the queue again here
+    {_,_QLen1} = process_info(self(), message_queue_len),
+    ?observe(Name,{max_qlen,_QLen1}),
+    
+    %% Add 1 for the current log request
+    ?observe(Name,{flushed,_NewFlushed+1}),
+ 
+    State1 = ?update_max_time(?diff_time(T1,_T0),State),
+    {dropped,?update_other(flushed,FLUSHED,_NewFlushed,
+                           State1#{mode => ?set_mode(Name,async),
+                                   last_qlen => 0,
+                                   last_log_ts => T1})}.
+
+%% this clause is called to write to file
+write(Name, Mode, T1, Bin, _CallOrCast,
+      State = #{file_ctrl_pid := FileCtrlPid,
+                file_ctrl_sync := FileCtrlSync,
+                last_qlen := LastQLen,
+                last_log_ts := T0,
+                file_ctrl_sync_int := FileCtrlSyncInt}) ->
+    %% check if we need to limit the number of writes
+    %% during a burst of log requests
+    {DoWrite,BurstWinT,BurstMsgCount} = logger_h_common:limit_burst(State),
+
+    %% only send a synhrounous request to the file controller process
+    %% every FileCtrlSyncInt time, to give the handler time between
+    %% file writes so it can keep up with incoming messages
+    {Result,LastQLen1} =
+        if DoWrite, FileCtrlSync == 0 ->
+                ?observe(Name,{_CallOrCast,1}),
+                file_write_sync(FileCtrlPid, Bin, false),
+                {ok,element(2, process_info(self(), message_queue_len))};
+           DoWrite ->
+                ?observe(Name,{_CallOrCast,1}),
+                file_write_async(FileCtrlPid, Bin),
+                {ok,LastQLen};
+           not DoWrite ->
+                ?observe(Name,{flushed,1}),
+                {dropped,LastQLen}
+        end,
+    
+    %% Check if the time since the previous log request is long enough -
+    %% and the queue length small enough - to assume the mailbox has
+    %% been emptied, and if so, do filesync operation and reset mode to
+    %% async. Note that this is the best we can do to detect an idle
+    %% handler without setting a timer after each log call/cast. If the
+    %% time between two consecutive log requests is fast and no new
+    %% request comes in after the last one, idle state won't be detected!
+    Time = ?diff_time(T1,T0),
+    {Mode1,BurstMsgCount1} =
+        if (LastQLen1 < ?FILESYNC_OK_QLEN) andalso
+           (Time > ?IDLE_DETECT_TIME_USEC) ->
+                %% do filesync if necessary
+                case maps:get(type, State) of
+                    Std when is_atom(Std) ->
+                        ok;
+                    _File ->
+                        file_ctrl_filesync_async(FileCtrlPid)
+                end,
+                {?change_mode(Name, Mode, async),0};
+           true ->
+                {Mode,BurstMsgCount}
+        end,
+    State1 =
+        ?update_calls_or_casts(_CallOrCast,1,State),
+    State2 =
+        ?update_max_time(Time,
+                         State1#{mode => Mode1,
+                                 last_qlen := LastQLen1,
+                                 last_log_ts => T1,
+                                 burst_win_ts => BurstWinT,
+                                 burst_msg_count => BurstMsgCount1,
+                                 file_ctrl_sync =>
+                                     ?update_file_ctrl_sync(FileCtrlSync,
+                                                            FileCtrlSyncInt)}),
+    {Result,State2}.
+
+open_log_file(HandlerName, FileInfo) ->
+    case file_ctrl_start(HandlerName, FileInfo) of
+        OK = {ok,_FileCtrlPid} -> OK;
+        Error -> Error
+    end.
+
+do_open_log_file({file,File}) ->
+    do_open_log_file({file,File,[raw,append,delayed_write]});
+
+do_open_log_file({file,File,[]}) ->
+    do_open_log_file({file,File,[raw,append,delayed_write]});
+
+do_open_log_file({file,File,Modes}) ->
+    try
+        case filelib:ensure_dir(File) of
+            ok ->
+                file:open(File, Modes);
+            Error ->
+                Error
+        end
+    catch
+        _:Reason -> {error,Reason}
+    end.
+
+close_log_file(Std) when Std == standard_io; Std == standard_error ->
+    ok;
+close_log_file(Fd) ->
+    _ = file:datasync(Fd),
+    _ = file:close(Fd).
+
+%%%-----------------------------------------------------------------
+%%% File control process
+
+file_ctrl_start(HandlerName, FileInfo) ->
+    Starter = self(),
+    FileCtrlPid =
+        spawn_link(fun() ->
+                           file_ctrl_init(HandlerName, FileInfo, Starter)
+                   end),
+    receive
+        {FileCtrlPid,ok} ->
+            {ok,FileCtrlPid};
+        {FileCtrlPid,Error} ->
+            Error
+    after
+        ?DEFAULT_CALL_TIMEOUT ->
+            {error,file_ctrl_process_not_started}
+    end.
+
+file_ctrl_stop(Pid) ->
+    Pid ! stop.
+
+file_write_async(Pid, Bin) ->
+    Pid ! {log,Bin},
+    ok.
+
+file_write_sync(Pid, Bin, FileSync) ->
+    case file_ctrl_call(Pid, {log,self(),Bin,FileSync}) of
+        {error,Reason} ->
+            {error,{write_failed,Bin,Reason}};
+        Result ->
+            Result
+    end.
+
+file_ctrl_filesync_async(Pid) ->
+    Pid ! filesync,
+    ok.
+
+file_ctrl_filesync_sync(Pid) ->
+    file_ctrl_call(Pid, {filesync,self()}).
+
+file_ctrl_call(Pid, Msg) ->
+    MRef = monitor(process, Pid),
+    Pid ! {Msg,MRef},
+    receive
+        {MRef,Result} ->
+            demonitor(MRef, [flush]),
+            Result;
+        {'DOWN',MRef,_Type,_Object,Reason} ->
+            {error,Reason}
+    after
+        ?DEFAULT_CALL_TIMEOUT ->
+            {error,{no_response,Pid}}
+    end.    
+
+file_ctrl_init(HandlerName, FileInfo, Starter) when is_tuple(FileInfo) ->
+    process_flag(message_queue_data, off_heap),
+    FileName = element(2, FileInfo),
+    case do_open_log_file(FileInfo) of
+        {ok,Fd} ->
+            Starter ! {self(),ok},
+            file_ctrl_loop(Fd, file, FileName, false, ok, ok, HandlerName);
+        {error,Reason} ->
+            Starter ! {self(),{error,{open_failed,FileName,Reason}}}
+    end;
+file_ctrl_init(HandlerName, StdDev, Starter) ->
+    Starter ! {self(),ok},
+    file_ctrl_loop(StdDev, standard_io, StdDev, false, ok, ok, HandlerName).
+
+file_ctrl_loop(Fd, Type, DevName, Synced,
+               PrevWriteResult, PrevSyncResult, HandlerName) ->
+    receive
+        %% asynchronous request
+        {log,Bin} ->
+            Result = if Type == file ->
+                             write_to_dev(Fd, Bin, DevName,
+                                          PrevWriteResult, HandlerName);
+                        true ->
+                             io:put_chars(Fd, Bin)
+                     end,
+            file_ctrl_loop(Fd, Type, DevName, false,
+                           Result, PrevSyncResult, HandlerName);
+
+        %% synchronous request
+        {{log,From,Bin,FileSync},MRef} ->
+            if Type == file ->
+                    %% check that file hasn't been deleted
+                    CheckFile =
+                        fun() -> {ok,_} = file:read_file_info(DevName) end,
+                    spawn_link(CheckFile),
+                    WResult = write_to_dev(Fd, Bin, DevName,
+                                           PrevWriteResult, HandlerName),
+                    {Synced1,SResult} =
+                        if not FileSync ->
+                                {false,PrevSyncResult};
+                           true ->
+                                case sync_dev(Fd, DevName,
+                                              PrevSyncResult, HandlerName) of
+                                    ok     -> {true,ok};
+                                    Error  -> {false,Error}
+                                end
+                        end,
+                    From ! {MRef,ok},
+                    file_ctrl_loop(Fd, Type, DevName, Synced1,
+                                   WResult, SResult, HandlerName);
+               true ->
+                    _ = io:put_chars(Fd, Bin),
+                    From ! {MRef,ok},
+                    file_ctrl_loop(Fd, Type, DevName, false,
+                                   ok, PrevSyncResult, HandlerName)
+            end;
+
+        filesync when not Synced ->
+            Result = sync_dev(Fd, DevName, PrevSyncResult, HandlerName),
+            file_ctrl_loop(Fd, Type, DevName, true,
+                           PrevWriteResult, Result, HandlerName);
+
+        filesync ->
+            file_ctrl_loop(Fd, Type, DevName, true,
+                           PrevWriteResult, PrevSyncResult, HandlerName);
+
+        {{filesync,From},MRef} ->
+            Result = if not Synced ->
+                             sync_dev(Fd, DevName, PrevSyncResult, HandlerName);
+                        true ->
+                             ok
+                     end,
+            From ! {MRef,ok},
+            file_ctrl_loop(Fd, Type, DevName, true,
+                           PrevWriteResult, Result, HandlerName);
+
+        stop ->
+            _ = close_log_file(Fd),
+            stopped
+    end.
+
+write_to_dev(Fd, Bin, FileName, PrevWriteResult, HandlerName) ->
+    case ?file_write(Fd, Bin) of
+        ok ->
+            ok;
+        PrevWriteResult ->
+            %% don't report same error twice
+            PrevWriteResult;
+        Error ->
+            logger_h_common:error_notify({HandlerName,write,FileName,Error}),
+            Error
+    end.
+
+sync_dev(Fd, DevName, PrevSyncResult, HandlerName) ->
+    case ?file_datasync(Fd) of
+        ok ->
+            ok;
+        PrevSyncResult ->
+            %% don't report same error twice
+            PrevSyncResult;
+        Error ->
+            logger_h_common:error_notify({HandlerName,filesync,DevName,Error}),
+            Error
+    end.
+
diff --git a/lib/kernel/src/logger_sup.erl b/lib/kernel/src/logger_sup.erl
new file mode 100644
index 0000000000..4e4de94d5c
--- /dev/null
+++ b/lib/kernel/src/logger_sup.erl
@@ -0,0 +1,53 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2017. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+
+%%%===================================================================
+%%% API functions
+%%%===================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?SERVER}, ?MODULE, []).
+
+%%%===================================================================
+%%% Supervisor callbacks
+%%%===================================================================
+
+init([]) ->
+
+    SupFlags = #{strategy => one_for_one,
+                 intensity => 1,
+                 period => 5},
+
+    {ok, {SupFlags, []}}.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
diff --git a/lib/kernel/test/Makefile b/lib/kernel/test/Makefile
index 03b6355056..8599a3d814 100644
--- a/lib/kernel/test/Makefile
+++ b/lib/kernel/test/Makefile
@@ -70,6 +70,15 @@ MODULES= \
 	interactive_shell_SUITE \
 	init_SUITE \
 	kernel_config_SUITE \
+	logger_SUITE \
+	logger_bench_SUITE \
+	logger_disk_log_h_SUITE \
+	logger_env_var_SUITE \
+	logger_filters_SUITE \
+	logger_formatter_SUITE \
+	logger_legacy_SUITE \
+	logger_simple_SUITE \
+	logger_std_h_SUITE \
 	os_SUITE \
 	pg2_SUITE \
 	seq_trace_SUITE \
@@ -102,7 +111,7 @@ TARGET_FILES= $(MODULES:%=$(EBIN)/%.$(EMULATOR))
 INSTALL_PROGS= $(TARGET_FILES)
 
 EMAKEFILE=Emakefile
-COVERFILE=kernel.cover
+COVERFILE=kernel.cover logger.cover
 
 # ----------------------------------------------------
 # Release directory specification
@@ -149,7 +158,8 @@ release_tests_spec: make_emakefile
 	$(INSTALL_DIR) "$(RELSYSDIR)"
 	$(INSTALL_DATA) $(ERL_FILES) "$(RELSYSDIR)"
 	$(INSTALL_DATA) $(APP_FILES) "$(RELSYSDIR)"
-	$(INSTALL_DATA) kernel.spec kernel_smoke.spec kernel_bench.spec \
+	$(INSTALL_DATA) \
+		kernel.spec kernel_smoke.spec kernel_bench.spec logger.spec \
 		$(EMAKEFILE) $(COVERFILE) "$(RELSYSDIR)"
 	chmod -R u+w "$(RELSYSDIR)"
 	@tar cf - *_SUITE_data | (cd "$(RELSYSDIR)"; tar xf -)
diff --git a/lib/kernel/test/kernel.spec b/lib/kernel/test/kernel.spec
index 62afc9f97b..86d2155828 100644
--- a/lib/kernel/test/kernel.spec
+++ b/lib/kernel/test/kernel.spec
@@ -2,3 +2,4 @@
 {config, "../test_server/ts.unix.config"}.
 
 {suites,"../kernel_test", all}.
+{skip_suites,"../kernel_test",[logger_bench_SUITE],"Not ready"}.
diff --git a/lib/kernel/test/logger.cover b/lib/kernel/test/logger.cover
new file mode 100644
index 0000000000..b30bcfe920
--- /dev/null
+++ b/lib/kernel/test/logger.cover
@@ -0,0 +1,14 @@
+%% -*- erlang -*-
+{incl_mods,[error_logger,
+            logger,
+            logger_backend,
+            logger_config,
+            logger_disk_log_h,
+            logger_h_common,
+            logger_filters,
+            logger_formatter,
+            logger_server,
+            logger_simple,
+            logger_std_h,
+            logger_sup]}.
+
diff --git a/lib/kernel/test/logger.spec b/lib/kernel/test/logger.spec
new file mode 100644
index 0000000000..cd76a754a4
--- /dev/null
+++ b/lib/kernel/test/logger.spec
@@ -0,0 +1,11 @@
+%% -*-erlang-*-
+{suites,"../kernel_test", [error_logger_SUITE,
+                           error_logger_warn_SUITE,
+                           logger_SUITE,
+                           logger_disk_log_h_SUITE,
+                           logger_env_var_SUITE,
+                           logger_filters_SUITE,
+                           logger_formatter_SUITE,
+                           logger_legacy_SUITE,
+                           logger_simple_SUITE,
+                           logger_std_h_SUITE]}.
diff --git a/lib/kernel/test/logger_SUITE.erl b/lib/kernel/test/logger_SUITE.erl
new file mode 100644
index 0000000000..0edce3e34c
--- /dev/null
+++ b/lib/kernel/test/logger_SUITE.erl
@@ -0,0 +1,828 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+
+-define(str,"Log from "++atom_to_list(?FUNCTION_NAME)++
+            ":"++integer_to_list(?LINE)).
+-define(map_rep,#{function=>?FUNCTION_NAME, line=>?LINE}).
+-define(keyval_rep,[{function,?FUNCTION_NAME}, {line,?LINE}]).
+
+-define(MY_LOC(N),#{mfa=>{?MODULE,?FUNCTION_NAME,?FUNCTION_ARITY},
+                    file=>?FILE, line=>?LINE-N}).
+
+-define(TRY(X), my_try(fun() -> X end)).
+
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    case logger:get_handler_config(logger_std_h) of
+        {ok,StdH} ->
+            ok = logger:remove_handler(logger_std_h),
+            [{logger_std_h,StdH}|Config];
+        _ ->
+            Config
+    end.
+
+end_per_suite(Config) ->
+    case ?config(logger_std_h,Config) of
+        {HMod,HConfig} ->
+            ok = logger:add_handler(logger_std_h,HMod,HConfig);
+        _ ->
+            ok
+    end.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    {ok,LC} = logger:get_logger_config(),
+    [{logger_config,LC}|Config].
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [start_stop,
+     add_remove_handler,
+     multiple_handlers,
+     add_remove_filter,
+     change_config,
+     set_formatter,
+     log_all_levels_api,
+     macros,
+     set_level,
+     set_level_module,
+     cache_level_module,
+     format_report,
+     filter_failed,
+     handler_failed,
+     config_sanity_check,
+     log_failed,
+     emulator,
+     via_logger_process,
+     other_node,
+     compare_levels,
+     process_metadata].
+
+start_stop(_Config) ->
+    S = whereis(logger),
+    true = is_pid(S),
+    ok.
+
+add_remove_handler(_Config) ->
+    register(callback_receiver,self()),
+    {ok,#{handlers:=Hs0}} = logger:get_logger_config(),
+    {error,{not_found,h1}} = logger:get_handler_config(h1),
+    ok = logger:add_handler(h1,?MODULE,#{}),
+    [add] = test_server:messages_get(),
+    {ok,#{handlers:=Hs}} = logger:get_logger_config(),
+    [h1|Hs0] = Hs,
+    {ok,{?MODULE,#{level:=info,filters:=[],filter_default:=log}}} = % defaults
+        logger:get_handler_config(h1),
+    ok = logger:set_handler_config(h1,filter_default,stop),
+    [changing_config] = test_server:messages_get(),
+    ?LOG_INFO("hello",[]),
+    ok = check_no_log(),
+    ok = logger:set_handler_config(h1,filter_default,log),
+    [changing_config] = test_server:messages_get(),
+    {ok,{?MODULE,#{filter_default:=log}}} = logger:get_handler_config(h1),
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(info,"hello",[],?MY_LOC(1)),
+    ok = logger:remove_handler(h1),
+    [remove] = test_server:messages_get(),
+    {ok,#{handlers:=Hs0}} = logger:get_logger_config(),
+    {error,{not_found,h1}} = logger:get_handler_config(h1),
+    {error,{not_found,h1}} = logger:remove_handler(h1),
+    logger:info("hello",[]),
+    ok = check_no_log(),
+    ok.
+
+add_remove_handler(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+multiple_handlers(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    ok = logger:add_handler(h2,?MODULE,#{level=>error,filter_default=>log}),
+    ?LOG_ERROR("hello",[]),
+    ok = check_logged(error,"hello",[],?MY_LOC(1)),
+    ok = check_logged(error,"hello",[],?MY_LOC(2)),
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(info,"hello",[],?MY_LOC(1)),
+    ok = check_no_log(),
+    ok.
+
+multiple_handlers(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:remove_handler(h2),
+    ok.
+
+add_remove_filter(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    LF = {fun(Log,_) -> Log#{level=>error} end, []},
+    ok = logger:add_logger_filter(lf,LF),
+    {error,{already_exist,lf}} = logger:add_logger_filter(lf,LF),
+    {error,{already_exist,lf}} = logger:add_logger_filter(lf,{fun(Log,_) ->
+                                                                      Log
+                                                              end, []}),
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(error,"hello",[],?MY_LOC(1)),
+    ok = check_no_log(),
+
+    ok = logger:add_handler(h2,?MODULE,#{level=>info,filter_default=>log}),
+    HF = {fun(#{level:=error}=Log,_) ->
+                  Log#{level=>mylevel};
+             (_,_) ->
+                  ignore
+          end,
+          []},
+    ok = logger:add_handler_filter(h1,hf,HF),
+    {error,{already_exist,hf}} = logger:add_handler_filter(h1,hf,HF),
+    {error,{already_exist,hf}} = logger:add_handler_filter(h1,hf,{fun(Log,_) ->
+                                                                          Log
+                                                                  end, []}),
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(mylevel,"hello",[],?MY_LOC(1)),
+    ok = check_logged(error,"hello",[],?MY_LOC(2)),
+
+    ok = logger:remove_logger_filter(lf),
+    {error,{not_found,lf}} = logger:remove_logger_filter(lf),
+
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(info,"hello",[],?MY_LOC(1)),
+    ok = check_logged(info,"hello",[],?MY_LOC(2)),
+
+    ?LOG_ERROR("hello",[]),
+    ok = check_logged(mylevel,"hello",[],?MY_LOC(1)),
+    ok = check_logged(error,"hello",[],?MY_LOC(2)),
+
+    ok = logger:remove_handler_filter(h1,hf),
+    {error,{not_found,hf}} = logger:remove_handler_filter(h1,hf),
+    ?LOG_INFO("hello",[]),
+    ok = check_logged(info,"hello",[],?MY_LOC(1)),
+    ok = check_logged(info,"hello",[],?MY_LOC(2)),
+
+    ?LOG_ERROR("hello",[]),
+    ok = check_logged(error,"hello",[],?MY_LOC(1)),
+    ok = check_logged(error,"hello",[],?MY_LOC(2)),
+    ok.
+
+add_remove_filter(cleanup,_Config) ->
+    logger:remove_logger_filter(lf),
+    logger:remove_handler(h1),
+    logger:remove_handler(h2),
+    ok.
+
+change_config(_Config) ->
+    %% Overwrite handler config - check that defaults are added
+    ok = logger:add_handler(h1,?MODULE,#{level=>debug,custom=>custom}),
+    {ok,{?MODULE,#{level:=debug,filter_default:=log,custom:=custom}}} =
+        logger:get_handler_config(h1),
+    register(callback_receiver,self()),
+    ok = logger:set_handler_config(h1,#{filter_default=>stop}),
+    [changing_config] = test_server:messages_get(),
+    {ok,{?MODULE,#{level:=info,filter_default:=stop}=C2}} =
+        logger:get_handler_config(h1),
+    false = maps:is_key(custom,C2),
+    {error,fail} = logger:set_handler_config(h1,#{fail=>true}),
+    {error,{attempting_syncronous_call_to_self,_}} =
+        logger:set_handler_config(
+          h1,#{call=>fun() -> logger:set_module_level(?MODULE,debug) end}),
+    {ok,{?MODULE,C2}} = logger:get_handler_config(h1),
+
+    %% Change one key only
+    {error,fail} = logger:set_handler_config(h1,fail,true),
+    ok = logger:set_handler_config(h1,custom,custom),
+    [changing_config] = test_server:messages_get(),
+    {ok,{?MODULE,#{custom:=custom}=C3}} = logger:get_handler_config(h1),
+    C2 = maps:remove(custom,C3),
+
+    %% Overwrite logger config - check that defaults are added
+    {ok,LConfig} = logger:get_logger_config(),
+    ok = logger:set_logger_config(#{filter_default=>stop}),
+    {ok,#{level:=info,filters:=[],handlers:=[],filter_default:=stop}=LC1} =
+        logger:get_logger_config(),
+    4 = maps:size(LC1),
+
+    %% Change one key only
+    ok = logger:set_logger_config(handlers,[h1]),
+    {ok,#{level:=info,filters:=[],handlers:=[h1],filter_default:=stop}} =
+        logger:get_logger_config(),
+
+    %% Cleanup
+    ok = logger:set_logger_config(LConfig),
+    [] = test_server:messages_get(),
+
+    ok.
+
+change_config(cleanup,Config) ->
+    logger:remove_handler(h1),
+    LC = ?config(logger_config,Config),
+    logger:set_logger_config(LC),
+    ok.
+
+set_formatter(_Config) ->
+    {error,{not_found,h1}}=logger:set_handler_config(h1,formatter,{?MODULE,[]}),
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    ok = logger:set_handler_config(h1,formatter,{?MODULE,[]}),
+    logger:info("hello",[]),
+    receive
+        {_Log,#{formatter:={?MODULE,[]}}} ->
+            ok
+    after 500 ->
+            ct:fail({timeout,no_log,process_info(self(),messages)})
+    end,
+    ok.
+
+set_formatter(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+log_all_levels_api(_Config) ->
+    ok = logger:set_logger_config(level,debug),
+    ok = logger:add_handler(h1,?MODULE,#{level=>debug,filter_default=>log}),
+    test_api(emergency),
+    test_api(alert),
+    test_api(critical),
+    test_api(error),
+    test_api(warning),
+    test_api(notice),
+    test_api(info),
+    test_api(debug),
+    test_log_function(emergency),
+    ok.
+
+log_all_levels_api(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:set_logger_config(level,info),
+    ok.
+
+macros(_Config) ->
+    ok = logger:set_module_level(?MODULE,debug),
+    ok = logger:add_handler(h1,?MODULE,#{level=>debug,filter_default=>log}),
+    test_macros(emergency),
+    ok.
+
+macros(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:reset_module_level(?MODULE),
+    ok.
+
+set_level(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>debug,filter_default=>log}),
+    logger:debug(?map_rep),
+    ok = check_no_log(),
+    logger:info(M1=?map_rep),
+    ok = check_logged(info,M1,#{}),
+    ok = logger:set_logger_config(level,debug),
+    logger:debug(M2=?map_rep),
+    ok = check_logged(debug,M2,#{}),
+    ok.
+
+set_level(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:set_logger_config(level,info),
+    ok.
+
+set_level_module(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    {error,{invalid_level,bad}} = logger:set_module_level(?MODULE,bad),
+    {error,{not_a_module,{bad}}} = logger:set_module_level({bad},warning),
+    ok = logger:set_module_level(?MODULE,warning),
+    logger:info(?map_rep,?MY_LOC(0)),
+    ok = check_no_log(),
+    logger:warning(M1=?map_rep,?MY_LOC(0)),
+    ok = check_logged(warning,M1,?MY_LOC(1)),
+    ok = logger:set_module_level(?MODULE,info),
+    logger:info(M2=?map_rep,?MY_LOC(0)),
+    ok = check_logged(info,M2,?MY_LOC(1)),
+
+    {error,{not_a_module,{bad}}} = logger:reset_module_level({bad}),
+    ok = logger:reset_module_level(?MODULE),
+
+    ok.
+
+set_level_module(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:reset_module_level(?MODULE),
+    ok.
+
+cache_level_module(_Config) ->
+    ok = logger:reset_module_level(?MODULE),
+    [] = ets:lookup(logger,?MODULE), %dirty - add API in logger_config?
+    ?LOG_INFO(?map_rep),
+    %% Caching is done asynchronously, so wait a bit for the update
+    timer:sleep(100),
+    [_] = ets:lookup(logger,?MODULE), %dirty - add API in logger_config?
+    ok = logger:reset_module_level(?MODULE),
+    [] = ets:lookup(logger,?MODULE), %dirty - add API in logger_config?
+    ok.
+
+cache_level_module(cleanup,_Config) ->
+    logger:reset_module_level(?MODULE),
+    ok.
+
+format_report(_Config) ->
+    {"~ts",["string"]} = logger:format_report("string"),
+    {"~tp",[term]} = logger:format_report(term),
+    {"~tp",[[]]} = logger:format_report([]),
+    {"    ~tp: ~tp",[key,value]} = logger:format_report([{key,value}]),
+    KeyVals = [{key1,value1},{key2,"value2"},{key3,[]}],
+    KeyValRes =
+        {"    ~tp: ~tp\n    ~tp: ~ts\n    ~tp: ~tp",
+         [key1,value1,key2,"value2",key3,[]]} =
+        logger:format_report(KeyVals),
+    KeyValRes = logger:format_report(maps:from_list(KeyVals)),
+    KeyValRes = logger:format_otp_report(#{label=>{?MODULE,test},report=>KeyVals}),
+    {"    ~tp: ~tp\n    ~tp: ~tp",
+     [label,{?MODULE,test},report,KeyVals]} =
+        logger:format_report(#{label=>{?MODULE,test},report=>KeyVals}),
+
+    {"    ~tp: ~tp\n    ~tp",[key1,value1,term]} =
+        logger:format_report([{key1,value1},term]),
+
+    {"    ~tp: ~tp\n    ~tp",[key1,value1,[]]} =
+        logger:format_report([{key1,value1},[]]),
+
+    {"~tp",[[]]} = logger:format_report([[],[],[]]),
+
+    ok.
+
+filter_failed(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+
+    %% Logger filters
+    {error,{invalid_filter,_}} =
+        logger:add_logger_filter(lf,{fun(_) -> ok end,args}),
+    ok = logger:add_logger_filter(lf,{fun(_,_) -> a=b end,args}),
+    {ok,#{filters:=[_]}} = logger:get_logger_config(),
+    ok = logger:info(M1=?map_rep),
+    ok = check_logged(info,M1,#{}),
+    {error,{not_found,lf}} = logger:remove_logger_filter(lf),
+
+    ok = logger:add_logger_filter(lf,{fun(_,_) -> faulty_return end,args}),
+    {ok,#{filters:=[_]}} = logger:get_logger_config(),
+    ok = logger:info(M2=?map_rep),
+    ok = check_logged(info,M2,#{}),
+    {error,{not_found,lf}} = logger:remove_logger_filter(lf),
+
+    %% Handler filters
+    {error,{not_found,h0}} =
+        logger:add_handler_filter(h0,hf,{fun(_,_) -> ignore end,args}),
+    {error,{not_found,h0}} = logger:remove_handler_filter(h0,hf),
+    {error,{invalid_filter,_}} =
+        logger:add_handler_filter(h1,hf,{fun(_) -> ok end,args}),
+    ok = logger:add_handler_filter(h1,hf,{fun(_,_) -> a=b end,args}),
+    {ok,{?MODULE,#{filters:=[_]}}} = logger:get_handler_config(h1),
+    ok = logger:info(M3=?map_rep),
+    ok = check_logged(info,M3,#{}),
+    {error,{not_found,hf}} = logger:remove_handler_filter(h1,hf),
+
+    ok = logger:add_handler_filter(h1,hf,{fun(_,_) -> faulty_return end,args}),
+    {ok,{?MODULE,#{filters:=[_]}}} = logger:get_handler_config(h1),
+    ok = logger:info(M4=?map_rep),
+    ok = check_logged(info,M4,#{}),
+    {error,{not_found,hf}} = logger:remove_handler_filter(h1,hf),
+
+    ok.
+
+filter_failed(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+handler_failed(_Config) ->
+    {error,{invalid_id,1}} = logger:add_handler(1,?MODULE,#{}),
+    {error,{invalid_module,"nomodule"}} = logger:add_handler(h1,"nomodule",#{}),
+    {error,{invalid_handler_config,bad}} = logger:add_handler(h1,?MODULE,bad),
+    {error,{invalid_filters,false}} =
+        logger:add_handler(h1,?MODULE,#{filters=>false}),
+    {error,{invalid_filter_default,true}} =
+        logger:add_handler(h1,?MODULE,#{filter_default=>true}),
+    {error,{invalid_formatter,[]}} =
+        logger:add_handler(h1,?MODULE,#{formatter=>[]}),
+    ok = logger:add_handler(h1,nomodule,#{filter_default=>log}),
+    logger:info(?map_rep),
+    check_no_log(),
+    #{logger:=#{handlers:=Ids1},
+      handlers:=H1} = logger:i(),
+    false = lists:member(h1,Ids1),
+    false = lists:keymember(h1,1,H1),
+    {error,{not_found,h1}} = logger:remove_handler(h1),
+
+    ok = logger:add_handler(h2,?MODULE,#{filter_default=>log,crash=>true}),
+    {error,{already_exist,h2}} = logger:add_handler(h2,othermodule,#{}),
+
+    logger:info(?map_rep),
+    check_no_log(),
+    #{logger:=#{handlers:=Ids2},
+      handlers:=H2} = logger:i(),
+    false = lists:member(h2,Ids2),
+    false = lists:keymember(h2,1,H2),
+    {error,{not_found,h2}} = logger:remove_handler(h2),
+
+    ok.
+
+handler_failed(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    logger:remove_handler(h2),
+    ok.
+
+config_sanity_check(_Config) ->
+    %% Logger config
+    {error,{invalid_filter_default,bad}} =
+        logger:set_logger_config(filter_default,bad),
+    {error,{invalid_level,bad}} = logger:set_logger_config(level,bad),
+    {error,{invalid_handlers,bad}} = logger:set_logger_config(handlers,bad),
+    {error,{invalid_id,{bad,bad}}} =
+        logger:set_logger_config(handlers,[{bad,bad}]),
+    {error,{invalid_id,"bad"}} = logger:set_logger_config(handlers,["bad"]),
+    {error,{invalid_filters,bad}} = logger:set_logger_config(filters,bad),
+    {error,{invalid_filter,bad}} = logger:set_logger_config(filters,[bad]),
+    {error,{invalid_filter,{_,_}}} =
+        logger:set_logger_config(filters,[{id,bad}]),
+    {error,{invalid_filter,{_,{_,_}}}} =
+        logger:set_logger_config(filters,[{id,{bad,args}}]),
+    {error,{invalid_filter,{_,{_,_}}}} =
+        logger:set_logger_config(filters,[{id,{fun() -> ok end,args}}]),
+    {error,{invalid_logger_config,{bad,bad}}} =
+        logger:set_logger_config(bad,bad),
+
+    %% Handler config
+    {error,{not_found,h1}} = logger:set_handler_config(h1,a,b),
+    ok = logger:add_handler(h1,?MODULE,#{}),
+    {error,{invalid_filter_default,bad}} =
+        logger:set_handler_config(h1,filter_default,bad),
+    {error,{invalid_level,bad}} = logger:set_handler_config(h1,level,bad),
+    {error,{invalid_filters,bad}} = logger:set_handler_config(h1,filters,bad),
+    {error,{invalid_filter,bad}} = logger:set_handler_config(h1,filters,[bad]),
+    {error,{invalid_filter,{_,_}}} =
+        logger:set_handler_config(h1,filters,[{id,bad}]),
+    {error,{invalid_filter,{_,{_,_}}}} =
+        logger:set_handler_config(h1,filters,[{id,{bad,args}}]),
+    {error,{invalid_filter,{_,{_,_}}}} =
+        logger:set_handler_config(h1,filters,[{id,{fun() -> ok end,args}}]),
+    {error,{invalid_formatter,bad}} =
+        logger:set_handler_config(h1,formatter,bad),
+    {error,{invalid_module,{bad}}} =
+        logger:set_handler_config(h1,formatter,{{bad},cfg}),
+    {error,{invalid_formatter_config,bad}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,bad}),
+    {error,{invalid_formatter_config,{bad,bad}}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,#{bad=>bad}}),
+    {error,{invalid_formatter_config,{template,bad}}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                #{template=>bad}}),
+    {error,{invalid_formatter_template,[1]}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                #{template=>[1]}}),
+    ok = logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                 #{template=>[]}}),
+    {error,{invalid_formatter_config,{single_line,bad}}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                #{single_line=>bad}}),
+    ok = logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                 #{single_line=>true}}),
+    {error,{invalid_formatter_config,{legacy_header,bad}}} =
+        logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                #{legacy_header=>bad}}),
+    ok = logger:set_handler_config(h1,formatter,{logger_formatter,
+                                                 #{legacy_header=>true}}),
+    ok = logger:set_handler_config(h1,custom,custom),
+    ok.
+
+config_sanity_check(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+log_failed(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    {error,function_clause} = ?TRY(logger:log(bad,?map_rep)),
+    {error,function_clause} = ?TRY(logger:log(info,?map_rep,bad)),
+    {error,function_clause} = ?TRY(logger:log(info,fun() -> ?map_rep end,bad)),
+    {error,function_clause} = ?TRY(logger:log(info,fun() -> ?map_rep end,bad,#{})),
+    {error,function_clause} = ?TRY(logger:log(info,bad,bad,bad)),
+    {error,function_clause} = ?TRY(logger:log(info,bad,bad,#{})),
+    check_no_log(),
+    ok = logger:log(info,M1=?str,#{}),
+    check_logged(info,M1,#{}),
+    ok = logger:log(info,M2=?map_rep,#{}),
+    check_logged(info,M2,#{}),
+    ok = logger:log(info,M3=?keyval_rep,#{}),
+    check_logged(info,M3,#{}),
+
+    %% Should we check report input more thoroughly?
+    ok = logger:log(info,M4=?keyval_rep++[other,stuff,in,list],#{}),
+    check_logged(info,M4,#{}),
+
+    %% This might break a handler since it is assumed to be a format
+    %% string and args, so it depends how the handler protects itself
+    %% against something like io_lib:format("ok","ok")
+    ok = logger:log(info,"ok","ok",#{}),
+    check_logged(info,"ok","ok",#{}),
+
+    ok.
+
+log_failed(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+emulator(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log,
+                                         tc_proc=>self()}),
+    Msg = "Error in process ~p on node ~p with exit value:~n~p~n",
+    Error = {badmatch,4},
+    Stack = [{module, function, 2, []}],
+    Pid = spawn(?MODULE, generate_error, [Error, Stack]),
+    check_logged(error, Msg, [Pid, node(), {Error, Stack}],
+                 #{gl=>group_leader(),
+                   error_logger=>#{tag=>error,emulator=>true}}),
+    ok.
+
+emulator(cleanup, _Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+generate_error(Error, Stack) ->
+    erlang:raise(error, Error, Stack).
+
+via_logger_process(Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log,
+                                         tc_proc=>self()}),
+
+    %% Explicitly send a message to the logger process
+    %% This is used by code_server, erl_prim_loader, init, prim_file, ...
+    Msg = ?str,
+    logger ! {log,error,Msg,[],#{}},
+    check_logged(error, Msg, [], #{}),
+
+    case os:type() of
+        {win32,_} ->
+            %% Skip this part on windows - cant change file mode"
+            ok;
+        _ ->
+            %% This should trigger the same thing from erl_prim_loader
+            Dir = filename:join(?config(priv_dir,Config),"dummydir"),
+            ok = file:make_dir(Dir),
+            ok = file:change_mode(Dir,8#0222),
+            error = erl_prim_loader:list_dir(Dir),
+            check_logged(error,
+                         #{report=>"File operation error: eacces. Target: " ++
+                               Dir ++". Function: list_dir. "},
+                         #{pid=>self(),
+                           gl=>group_leader(),
+                           error_logger=>#{tag=>error_report,
+                                           type=>std_error}}),
+            ok
+    end.
+
+via_logger_process(cleanup, Config) ->
+    Dir = filename:join(?config(priv_dir,Config),"dummydir"),
+    _ = file:change_mode(Dir,8#0664),
+    _ = file:del_dir(Dir),
+    logger:remove_handler(h1),
+    ok.
+
+other_node(_Config) ->
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log,
+                                         tc_proc=>self()}),
+    {ok,Node} = test_server:start_node(?FUNCTION_NAME,slave,[]),
+    rpc:call(Node,logger,error,[Msg=?str,#{}]),
+    check_logged(error,Msg,#{}),
+    ok.
+
+other_node(cleanup,_Config) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes],
+    logger:remove_handler(h1),
+    ok.
+
+compare_levels(_Config) ->
+    Levels = [emergency,alert,critical,error,warning,notice,info,debug],
+    ok = compare(Levels),
+    {error,badarg} = ?TRY(logger:compare_levels(bad,bad)),
+    {error,badarg} = ?TRY(logger:compare_levels({bad},info)),
+    {error,badarg} = ?TRY(logger:compare_levels(info,"bad")),
+    ok.
+
+compare([L|Rest]) ->
+    eq = logger:compare_levels(L,L),
+    [gt = logger:compare_levels(L,L1) || L1 <- Rest],
+    [lt = logger:compare_levels(L1,L) || L1 <- Rest],
+    compare(Rest);
+compare([]) ->
+    ok.
+
+process_metadata(_Config) ->
+    undefined = logger:get_process_metadata(),
+    {error,badarg} = ?TRY(logger:set_process_metadata(bad)),
+    ok = logger:add_handler(h1,?MODULE,#{level=>info,filter_default=>log}),
+    Time = erlang:monotonic_time(microsecond),
+    ProcMeta = #{time=>Time,line=>0,custom=>proc},
+    ok = logger:set_process_metadata(ProcMeta),
+    S1 = ?str,
+    ?LOG_INFO(S1,#{custom=>macro}),
+    check_logged(info,S1,#{time=>Time,line=>0,custom=>macro}),
+
+    Time2 = erlang:monotonic_time(microsecond),
+    S2 = ?str,
+    ?LOG_INFO(S2,#{time=>Time2,line=>1,custom=>macro}),
+    check_logged(info,S2,#{time=>Time2,line=>1,custom=>macro}),
+
+    logger:info(S3=?str,#{custom=>func}),
+    check_logged(info,S3,#{time=>Time,line=>0,custom=>func}),
+
+    ProcMeta = logger:get_process_metadata(),
+    ok = logger:unset_process_metadata(),
+    undefined = logger:get_process_metadata(),
+
+    ok.
+
+process_metadata(cleanup,_Config) ->
+    logger:remove_handler(h1),
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+check_logged(Level,Format,Args,Meta) ->
+    do_check_logged(Level,{Format,Args},Meta).
+
+check_logged(Level,Msg,Meta) when ?IS_REPORT(Msg) ->
+    do_check_logged(Level,{report,Msg},Meta);
+check_logged(Level,Msg,Meta) when ?IS_STRING(Msg) ->
+    do_check_logged(Level,{string,Msg},Meta).
+
+do_check_logged(Level,Msg0,Meta0) ->
+    receive
+        {#{level:=Level,msg:=Msg,meta:=Meta},_} ->
+            check_msg(Msg0,Msg),
+            check_maps(Meta0,Meta,meta)
+    after 500 ->
+            ct:fail({timeout,no_log,process_info(self(),messages)})
+    end.
+
+check_no_log() ->
+    receive
+        X -> ct:fail({got_unexpected_log,X})
+    after 500 ->
+            ok
+    end.
+
+check_msg(Msg,Msg) ->
+    ok;
+check_msg({report,Expected},{report,Got}) when is_map(Expected), is_map(Got) ->
+    check_maps(Expected,Got,msg);
+check_msg(Expected,Got) ->
+    ct:fail({unexpected,msg,Expected,Got}).
+
+check_maps(Expected,Got,What) ->
+    case maps:merge(Got,Expected) of
+        Got ->
+            ok;
+        _ ->
+            ct:fail({unexpected,What,Expected,Got})
+    end.
+
+%% Handler
+adding_handler(_Id,Config) ->
+    maybe_send(add),
+    {ok,Config}.
+removing_handler(_Id) ->
+    maybe_send(remove),
+    ok.
+changing_config(_Id,_Old,#{call:=Fun}) ->
+    Fun();
+changing_config(_Id,_Old,#{fail:=true}) ->
+    {error,fail};
+changing_config(_Id,_Old,Config) ->
+    maybe_send(changing_config),
+    {ok,Config}.
+
+maybe_send(Msg) ->
+    case whereis(callback_receiver) of
+        undefined -> ok;
+        Pid -> Pid ! Msg
+    end.
+
+log(_Log,#{crash:=true}) ->
+    a=b;
+log(Log,Config) ->
+    TcProc  = maps:get(tc_proc,Config,self()),
+    TcProc ! {Log,Config},
+    ok.
+
+test_api(Level) ->
+    logger:Level(#{Level=>rep}),
+    ok = check_logged(Level,#{Level=>rep},#{}),
+    logger:Level(#{Level=>rep},#{my=>meta}),
+    ok = check_logged(Level,#{Level=>rep},#{my=>meta}),
+    logger:Level("~w: ~w",[Level,fa]),
+    ok = check_logged(Level,"~w: ~w",[Level,fa],#{}),
+    logger:Level("~w: ~w ~w",[Level,fa,meta],#{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fa,meta],#{my=>meta}),
+    logger:Level(fun(x) -> {"~w: ~w ~w",[Level,fun_to_fa,meta]} end,x,
+                 #{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fun_to_fa,meta],#{my=>meta}),
+    logger:Level(fun(x) -> #{Level=>fun_to_r,meta=>true} end,x,
+                     #{my=>meta}),
+    ok = check_logged(Level,#{Level=>fun_to_r,meta=>true},#{my=>meta}),
+    logger:Level(fun(x) -> <<"fun_to_s">> end,x,#{}),
+    ok = check_logged(Level,<<"fun_to_s">>,#{}),
+    logger:Level(F1=fun(x) -> {fun_to_bad} end,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN ERROR: ~tp; Returned: ~tp",
+                      [{F1,x},{fun_to_bad}],#{}),
+    logger:Level(F2=fun(x) -> erlang:error(fun_that_crashes) end,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN CRASH: ~tp; Reason: ~tp",
+                      [{F2,x},{error,fun_that_crashes}],#{}),
+    ok.
+
+test_log_function(Level) ->
+    logger:log(Level,#{Level=>rep}),
+    ok = check_logged(Level,#{Level=>rep},#{}),
+    logger:log(Level,#{Level=>rep},#{my=>meta}),
+    ok = check_logged(Level,#{Level=>rep},#{my=>meta}),
+    logger:log(Level,"~w: ~w",[Level,fa]),
+    ok = check_logged(Level,"~w: ~w",[Level,fa],#{}),
+    logger:log(Level,"~w: ~w ~w",[Level,fa,meta],#{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fa,meta],#{my=>meta}),
+    logger:log(Level,fun(x) -> {"~w: ~w ~w",[Level,fun_to_fa,meta]} end,
+               x, #{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fun_to_fa,meta],#{my=>meta}),
+    logger:log(Level,fun(x) -> #{Level=>fun_to_r,meta=>true} end,
+               x, #{my=>meta}),
+    ok = check_logged(Level,#{Level=>fun_to_r,meta=>true},#{my=>meta}),
+    logger:log(Level,fun(x) -> <<"fun_to_s">> end,x,#{}),
+    ok = check_logged(Level,<<"fun_to_s">>,#{}),
+    logger:log(Level,F1=fun(x) -> {fun_to_bad} end,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN ERROR: ~tp; Returned: ~tp",
+                      [{F1,x},{fun_to_bad}],#{}),
+    logger:log(Level,F2=fun(x) -> erlang:error(fun_that_crashes) end,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN CRASH: ~tp; Reason: ~tp",
+                      [{F2,x},{error,fun_that_crashes}],#{}),
+    ok.
+
+test_macros(emergency=Level) ->
+    ?LOG_EMERGENCY(#{Level=>rep}),
+    ok = check_logged(Level,#{Level=>rep},?MY_LOC(1)),
+    ?LOG_EMERGENCY(#{Level=>rep},#{my=>meta}),
+    ok = check_logged(Level,#{Level=>rep},(?MY_LOC(1))#{my=>meta}),
+    ?LOG_EMERGENCY("~w: ~w",[Level,fa]),
+    ok = check_logged(Level,"~w: ~w",[Level,fa],?MY_LOC(1)),
+    ?LOG_EMERGENCY("~w: ~w ~w",[Level,fa,meta],#{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fa,meta],(?MY_LOC(1))#{my=>meta}),
+    ?LOG_EMERGENCY(fun(x) -> {"~w: ~w ~w",[Level,fun_to_fa,meta]} end,
+                   x, #{my=>meta}),
+    ok = check_logged(Level,"~w: ~w ~w",[Level,fun_to_fa,meta],
+                      (?MY_LOC(3))#{my=>meta}),
+    ?LOG_EMERGENCY(fun(x) -> #{Level=>fun_to_r,meta=>true} end, x, #{my=>meta}),
+    ok = check_logged(Level,#{Level=>fun_to_r,meta=>true},
+                      (?MY_LOC(2))#{my=>meta}),
+    ?LOG_EMERGENCY(fun(x) -> <<"fun_to_s">> end,x,#{}),
+    ok = check_logged(Level,<<"fun_to_s">>,?MY_LOC(1)),
+    F1=fun(x) -> {fun_to_bad} end,
+    ?LOG_EMERGENCY(F1,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN ERROR: ~tp; Returned: ~tp",
+                      [{F1,x},{fun_to_bad}],#{}),
+    F2=fun(x) -> erlang:error(fun_that_crashes) end,
+    ?LOG_EMERGENCY(F2,x,#{}),
+    ok = check_logged(Level,"LAZY_FUN CRASH: ~tp; Reason: ~tp",
+                      [{F2,x},{error,fun_that_crashes}],#{}),
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Called by macro ?TRY(X)
+my_try(Fun) ->
+    try Fun() catch C:R -> {C,R} end.
diff --git a/lib/kernel/test/logger_bench_SUITE.erl b/lib/kernel/test/logger_bench_SUITE.erl
new file mode 100644
index 0000000000..d47122ea9d
--- /dev/null
+++ b/lib/kernel/test/logger_bench_SUITE.erl
@@ -0,0 +1,500 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_bench_SUITE).
+
+-compile(export_all).
+
+%%%-----------------------------------------------------------------
+%%% To include lager tests, add paths to lager and goldrush
+%%% (goldrush is a dependency inside the lager repo)
+%%% 
+%%% To print data to .csv files, add the following to a config file:
+%%%   {print_csv,[{console_handler,[{path,"/some/dir/"}]}]}.
+%%%
+%%%-----------------------------------------------------------------
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("common_test/include/ct_event.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+
+-define(msg,lists:flatten(string:pad("Log from "++atom_to_list(?FUNCTION_NAME)++
+                                         ":"++integer_to_list(?LINE),
+                                      80,trailing,$*))).
+-define(meta,#{mfa=>{?MODULE,?FUNCTION_NAME,?FUNCTION_ARITY},
+               pid=>self()}).
+
+-define(NO_COMPARE,[profile]).
+
+-define(TIMES,100000).
+
+suite() ->
+    [{timetrap,{seconds,120}}].
+
+init_per_suite(Config) ->
+    DataDir = ?config(data_dir,Config),
+    have_lager() andalso make(DataDir),
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_group(Group, Config) ->
+    H = remove_all_handlers(),
+    do_init_per_group(Group),
+    [{handlers,H}|Config].
+
+do_init_per_group(minimal_handler) ->
+    ok = logger:add_handler(?MODULE,?MODULE,#{level=>error,filter_default=>log});
+do_init_per_group(console_handler) ->
+    ok = logger:add_handler(?MODULE,logger_std_h,
+                            #{filter_default=>stop,
+                              filters=>?DEFAULT_HANDLER_FILTERS,
+                              logger_std_h=>#{type=>standard_io,
+                                              toggle_sync_qlen => ?TIMES+1,
+                                              drop_new_reqs_qlen => ?TIMES+2,
+                                              flush_reqs_qlen => ?TIMES+3,
+                                              enable_burst_limit => false}}),
+    have_lager() andalso lager_helper:start(),
+    ok.
+
+end_per_group(Group, Config) ->
+    case ?config(saved_config,Config) of
+        {_,[{bench,Bench}]} ->
+            print_compare_chart(Group,Bench);
+        _ ->
+            ok
+    end,
+    add_all_handlers(?config(handlers,Config)),
+    do_end_per_group(Group).
+
+do_end_per_group(minimal_handler) ->
+    ok = logger:remove_handler(?MODULE);
+do_end_per_group(console_handler) ->
+    ok = logger:remove_handler(?MODULE),
+    have_lager() andalso lager_helper:stop(),
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    wait_for_handlers(),
+    ok.
+
+wait_for_handlers() ->
+    wait_for_handler(?MODULE),
+    wait_for_handler(lager_event).
+
+wait_for_handler(Handler) ->
+    case whereis(Handler) of
+        undefined ->
+            io:format("~p: noproc1",[Handler]),
+            ok;
+        Pid ->
+            case process_info(Pid,message_queue_len) of
+                {_,0} ->
+                    io:format("~p: queue=~p",[Handler,0]),
+                    ok;
+                {_,Q} ->
+                    io:format("~p: queue=~p",[Handler,Q]),
+                   timer:sleep(2000),
+                    wait_for_handler(Handler);
+                undefined ->
+                    io:format("~p: noproc2",[Handler]),
+                    ok
+            end
+    end.
+
+groups() ->
+    [{minimal_handler,[],[log,
+                          log_drop,
+                          log_drop_by_handler,
+                          macro,
+                          macro_drop,
+                          macro_drop_by_handler,
+                          error_logger,
+                          error_logger_drop,
+                          error_logger_drop_by_handler
+                         ]},
+     {console_handler,[],[%profile,
+                          log,
+                          log_drop,
+                          log_drop_by_handler,
+                          %% log_handler_complete,
+                          macro,
+                          macro_drop,
+                          macro_drop_by_handler,
+                          %% macro_handler_complete,
+                          error_logger,
+                          error_logger_drop,
+                          error_logger_drop_by_handler%% ,
+                          %% error_logger_handler_complete
+                         ] ++ lager_cases()}
+    ].
+
+lager_cases() ->
+    case have_lager() of
+        true ->
+            [lager_log,
+             lager_log_drop,
+             lager_log_drop_by_handler,
+             %% lager_log_handler_complete,
+             lager_parsetrans,
+             lager_parsetrans_drop,
+             lager_parsetrans_drop_by_handler%% ,
+             %% lager_parsetrans_handler_complete
+            ];
+        false ->
+            []
+    end.
+
+
+all() -> 
+    [{group,minimal_handler},
+     {group,console_handler}
+    ].
+
+log(Config) ->
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_func/2, [error,?msg], Times).
+
+log_drop(Config) ->
+    Times = ?TIMES*100,
+    ok = logger:set_logger_config(level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_func/2, [info,?msg], Times).
+
+log_drop(cleanup,_Config) ->
+    ok = logger:set_logger_config(level,info).
+
+log_drop_by_handler(Config) ->
+    Times = ?TIMES,
+    %% just ensure correct levels
+    ok = logger:set_logger_config(level,info),
+    ok = logger:set_handler_config(?MODULE,level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_func/2, [info,?msg], Times).
+
+log_handler_complete(Config) ->
+    ok = logger:set_handler_config(?MODULE,formatter,
+                                   {?MODULE,?DEFAULT_FORMAT_CONFIG}),
+    handler_complete(Config, ?FUNCTION_NAME, fun do_log_func/2, [error,?msg]).
+
+log_handler_complete(cleanup,_Config) ->
+    ok=logger:set_handler_config(?MODULE,formatter,
+                                 {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}).
+    
+macro(Config) ->
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_macro/2,[error,?msg], Times).
+    
+macro_drop(Config) ->
+    Times = ?TIMES*100,
+    ok = logger:set_logger_config(level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_macro/2,[info,?msg], Times).
+
+macro_drop(cleanup,_Config) ->
+    ok = logger:set_logger_config(level,info).
+
+macro_drop_by_handler(Config) ->
+    Times = ?TIMES,
+    %% just ensure correct levels
+    ok = logger:set_logger_config(level,info),
+    ok = logger:set_handler_config(?MODULE,level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_macro/2, [info,?msg], Times).
+    
+macro_handler_complete(Config) ->
+    ok = logger:set_handler_config(?MODULE,formatter,
+                                   {?MODULE,?DEFAULT_FORMAT_CONFIG}),
+    handler_complete(Config, ?FUNCTION_NAME, fun do_log_macro/2, [error,?msg]).
+
+macro_handler_complete(cleanup,_Config) ->
+    ok=logger:set_handler_config(?MODULE,formatter,
+                                 {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}).
+    
+error_logger(Config) ->
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun do_error_logger/2, [error,?msg], Times).
+    
+error_logger_drop(Config) ->
+    Times = ?TIMES*100,
+    ok = logger:set_logger_config(level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_error_logger/2, [info,?msg], Times).
+
+error_logger_drop(cleanup,_Config) ->
+    ok = logger:set_logger_config(level,info).
+
+error_logger_drop_by_handler(Config) ->
+    Times = ?TIMES,
+    %% just ensure correct levels
+    ok = logger:set_logger_config(level,info),
+    ok = logger:set_handler_config(?MODULE,level,error),
+    run_benchmark(Config,?FUNCTION_NAME,fun do_log_func/2, [info,?msg], Times).
+
+error_logger_handler_complete(Config) ->
+    ok = logger:set_handler_config(?MODULE,formatter,
+                                   {?MODULE,?DEFAULT_FORMAT_CONFIG}),
+    handler_complete(Config, ?FUNCTION_NAME, fun do_error_logger/2, [error,?msg]).
+
+error_logger_handler_complete(cleanup,_Config) ->
+    ok=logger:set_handler_config(?MODULE,formatter,
+                                 {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}).
+    
+lager_log(Config) ->
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_func/2, [error,?msg], Times).
+
+lager_log_drop(Config) ->
+    Times = ?TIMES*100,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_func/2, [info,?msg], Times).
+
+lager_log_drop_by_handler(Config) ->
+    %% This concept does not exist, so doing same as lager_log_drop/1
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_func/2, [info,?msg], Times).
+
+lager_log_handler_complete(Config) ->
+    handler_complete(Config, ?FUNCTION_NAME, fun lager_helper:do_func/2, [error,?msg]).
+    
+lager_parsetrans(Config) ->
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_parsetrans/2, [error,?msg], Times).
+
+lager_parsetrans_drop(Config) ->
+    Times = ?TIMES*100,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_parsetrans/2, [info,?msg], Times).
+
+lager_parsetrans_drop_by_handler(Config) ->
+    %% This concept does not exist, so doing same as lager_parsetrans_drop/1
+    Times = ?TIMES,
+    run_benchmark(Config,?FUNCTION_NAME,fun lager_helper:do_parsetrans/2, [info,?msg], Times).
+
+lager_parsetrans_handler_complete(Config) ->
+    handler_complete(Config, ?FUNCTION_NAME, fun lager_helper:do_parsetrans/2, [error,?msg]).
+
+
+profile(Config) ->
+    Times = ?TIMES,
+    %% fprof:apply(fun repeated_apply/3,[fun lager_helper:do_func/2,[error,?msg],Times]),
+    fprof:apply(fun repeated_apply/3,[fun do_log_func/2,[error,?msg],Times]),
+    ok = fprof:profile(),
+    ok = fprof:analyse(dest,"../fprof.analyse"),
+    ok.
+        
+%%%-----------------------------------------------------------------
+%%% Internal
+%% Handler
+log(_Log,_Config) ->
+    ok.
+
+format(Log=#{meta:=#{pid:=Pid}},Config) when is_pid(Pid) ->
+    String = ?DEFAULT_FORMATTER:format(Log,Config),
+    Pid ! done,
+    String;
+format(Log=#{meta:=#{pid:=PidStr}},Config) when is_list(PidStr) ->
+    String = ?DEFAULT_FORMATTER:format(Log,Config),
+    list_to_pid(PidStr) ! done,
+    String.
+
+handler_complete(Config, TC, Fun, Args) ->
+    Times = ?TIMES,
+    Start = os:perf_counter(microsecond),
+    repeated_apply(Fun, Args, Times),
+    MSecs = wait_for_done(Start,Times),
+    calc_and_report(Config,TC,MSecs,Times).
+
+wait_for_done(Start,0) ->
+    os:perf_counter(microsecond) - Start;
+wait_for_done(Start,N) ->
+    receive
+        done ->
+            wait_for_done(Start,N-1)
+    after 20000 ->
+            ct:fail("missing " ++ integer_to_list(N) ++ " replys")
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Benchmark stuff
+run_benchmark(Config,Tag,Fun,Args,Times) ->
+    _ = erlang:apply(Fun, Args), % apply once to ensure level is cached
+    MSecs = measure_repeated_op(Fun, Args, Times),
+    %% fprof:profile(),
+    %% fprof:analyse(dest,"../"++atom_to_list(Tag)++".prof"),
+    calc_and_report(Config,Tag,MSecs,Times).
+
+measure_repeated_op(Fun, Args, Times) ->
+    Start = os:perf_counter(microsecond),
+    %% fprof:apply(fun repeated_apply/3, [Fun, Args, Times]),
+    repeated_apply(Fun, Args, Times),
+    os:perf_counter(microsecond) - Start.
+
+repeated_apply(_F, _Args, Times) when Times =< 0 ->
+    ok;
+repeated_apply(F, Args, Times) ->
+    erlang:apply(F, Args),
+    repeated_apply(F, Args, Times - 1).
+
+calc_and_report(Config,Tag,MSecs,Times) ->
+    IOPS = trunc(Times * (1000000 / MSecs)),
+    ct_event:notify(#event{ name = benchmark_data, data = [{value,IOPS}] }),
+    ct:print("~p:~n~p IOPS, ~p us", [Tag, IOPS, MSecs]),
+    ct:comment("~p IOPS, ~p us", [IOPS, MSecs]),
+    Bench = case ?config(saved_config,Config) of
+                {_,[{bench,B}]} -> B;
+                undefined -> []
+            end,
+    {save_config,[{bench,[{Tag,IOPS,MSecs}|Bench]}]}.
+
+remove_all_handlers() ->
+    #{handlers:=Hs} = logger:i(),
+    [logger:remove_handler(Id) || {Id,_,_} <- Hs],
+    Hs.
+
+add_all_handlers(Hs) ->
+    [logger:add_handler(Id,Mod,Config) || {Id,Mod,Config} <- Hs],
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Call logger in different ways
+do_log_func(Level,Msg) ->
+    logger:Level(Msg,[],?meta).
+
+do_log_macro(error,Msg) ->
+    ?LOG_ERROR(Msg,[]);
+do_log_macro(info,Msg) ->
+    ?LOG_INFO(Msg,[]);
+do_log_macro(debug,Msg) ->
+    ?LOG_DEBUG(Msg,[]).
+
+do_error_logger(error,Msg) ->
+    error_logger:error_msg(Msg,[]);
+do_error_logger(info,Msg) ->
+    error_logger:info_msg(Msg,[]).
+
+%%%-----------------------------------------------------------------
+%%% 
+print_compare_chart(Group,Bench) ->
+    io:format("~-20s~12s~12s~12s~12s",
+              ["Microseconds:","Log","Drop","HDrop","Complete"]),
+    io:format(user,"~-20s~12s~12s~12s~12s~n",
+              ["Microseconds:","Log","Drop","HDrop","Complete"]),
+    {Log,Drop,HDrop,Comp} = sort_bench(Bench,[],[],[],[]),
+    print_compare_chart(Log,Drop,HDrop,Comp),
+    io:format(user,"~n",[]),
+    maybe_print_csv_files(Group,
+                          [{log,Log},{drop,Drop},{hdrop,HDrop},{comp,Comp}]).
+
+print_compare_chart([{What,LIOPS,LMSecs}|Log],
+                    [{What,DIOPS,DMSecs}|Drop],
+                    [{What,HIOPS,HMSecs}|HDrop],
+                    [{What,CIOPS,CMSecs}|Comp]) ->
+    io:format("~-20w~12w~12w~12w~12w",[What,LMSecs,DMSecs,HMSecs,CMSecs]),
+    io:format(user,"~-20w~12w~12w~12w~12w~n",[What,LMSecs,DMSecs,HMSecs,CMSecs]),
+    print_compare_chart(Log,Drop,HDrop,Comp);
+print_compare_chart([{What,LIOPS,LMSecs}|Log],
+                    [{What,DIOPS,DMSecs}|Drop],
+                    [{What,HIOPS,HMSecs}|HDrop],
+                    []=Comp) ->
+    io:format("~-20w~12w~12w~12w",[What,LMSecs,DMSecs,HMSecs]),
+    io:format(user,"~-20w~12w~12w~12w~n",[What,LMSecs,DMSecs,HMSecs]),
+    print_compare_chart(Log,Drop,HDrop,Comp);
+print_compare_chart([],[],[],[]) ->
+    ok;
+print_compare_chart(Log,Drop,HDrop,Comp) ->
+    ct:fail({Log,Drop,HDrop,Comp}).
+
+sort_bench([{TC,IOPS,MSecs}|Bench],Log,Drop,HDrop,Comp) ->
+    case lists:member(TC,?NO_COMPARE) of
+        true ->
+            sort_bench(Bench,Log,Drop,HDrop,Comp);
+        false ->
+            TCStr = atom_to_list(TC),
+            {What,Type} =
+                case re:run(TCStr,"(.*)_(drop.*)",
+                            [{capture,all_but_first,list}]) of
+                    {match,[WhatStr,TypeStr]} ->
+                        {list_to_atom(WhatStr),list_to_atom(TypeStr)};
+                    nomatch ->
+                        case re:run(TCStr,"(.*)_(handler_complete.*)",
+                                    [{capture,all_but_first,list}]) of
+                            {match,[WhatStr,TypeStr]} ->
+                                {list_to_atom(WhatStr),list_to_atom(TypeStr)};
+                            nomatch ->
+                                {TC,log}
+                        end
+                end,
+            case Type of
+                log ->
+                    sort_bench(Bench,[{What,IOPS,MSecs}|Log],Drop,HDrop,Comp);
+                drop ->
+                    sort_bench(Bench,Log,[{What,IOPS,MSecs}|Drop],HDrop,Comp);
+                drop_by_handler ->
+                    sort_bench(Bench,Log,Drop,[{What,IOPS,MSecs}|HDrop],Comp);
+                handler_complete ->
+                    sort_bench(Bench,Log,Drop,HDrop,[{What,IOPS,MSecs}|Comp])
+            end
+    end;
+sort_bench([],Log,Drop,HDrop,Comp) ->
+    {lists:keysort(1,Log),
+     lists:keysort(1,Drop),
+     lists:keysort(1,HDrop),
+     lists:keysort(1,Comp)}.
+
+maybe_print_csv_files(Group,Data) ->
+    case ct:get_config({print_csv,Group}) of
+        undefined ->
+            ok;
+        Cfg ->
+            Path = proplists:get_value(path,Cfg,".."),
+            Files = [begin
+                         File = filename:join(Path,F)++".csv",
+                         case filelib:is_regular(File) of
+                             true ->
+                                 {ok,Fd} = file:open(File,[append]),
+                                 Fd;
+                             false ->
+                                 {ok,Fd} = file:open(File,[write]),
+                                 ok = file:write(Fd,
+                                                 "error_logger,lager_log,"
+                                                 "lager_parsetrans,logger_log,"
+                                                 "logger_macro\n"),
+                                 Fd
+                         end
+                     end || {F,_} <- Data],
+            [print_csv_file(F,D) || {F,D} <- lists:zip(Files,Data)],
+            [file:close(Fd) || Fd <- Files],
+            ok
+    end.
+
+print_csv_file(Fd,{_,Data}) ->
+    AllIOPS = [integer_to_list(IOPS) || {_,IOPS,_} <- Data],
+    ok = file:write(Fd,lists:join(",",AllIOPS)++"\n").
+
+have_lager() ->
+    code:ensure_loaded(lager) == {module,lager}.
+
+make(Dir) ->
+    {ok,Cwd} = file:get_cwd(),
+    ok = file:set_cwd(Dir),
+    up_to_date = make:all([load]),
+    ok = file:set_cwd(Cwd),
+    code:add_path(Dir).
diff --git a/lib/kernel/test/logger_bench_SUITE_data/Emakefile b/lib/kernel/test/logger_bench_SUITE_data/Emakefile
new file mode 100644
index 0000000000..85c82bdaab
--- /dev/null
+++ b/lib/kernel/test/logger_bench_SUITE_data/Emakefile
@@ -0,0 +1 @@
+{['lager_helper'],[{outdir,"."},debug_info,{i,"/home/uabshan/Work/git/otp/lib/kernel/src"},{i,"/home/uabshan/Work/git/otp/lib/kernel/include"}]}.
diff --git a/lib/kernel/test/logger_bench_SUITE_data/lager_helper.erl b/lib/kernel/test/logger_bench_SUITE_data/lager_helper.erl
new file mode 100644
index 0000000000..296ced4276
--- /dev/null
+++ b/lib/kernel/test/logger_bench_SUITE_data/lager_helper.erl
@@ -0,0 +1,73 @@
+-module(lager_helper).
+
+-compile(export_all).
+-compile({parse_transform,lager_transform}).
+
+-include_lib("kernel/src/logger_internal.hrl").
+
+start() ->
+    application:load(lager),
+    application:set_env(lager, error_logger_redirect, false),
+    application:set_env(lager, async_threshold, 100010),
+    application:set_env(lager, async_threshold_window, 100),
+    application:set_env(lager,handlers,[{?MODULE,[{level,error}]}]),
+    lager:start().
+
+stop() ->
+    application:stop(lager).
+
+do_func(Level,Msg) ->
+    lager:log(Level,[{pid,self()}],Msg,[]).
+
+do_parsetrans(error,Msg) ->
+    lager:error(Msg,[]);
+do_parsetrans(info,Msg) ->
+    lager:info(Msg,[]).
+
+%%%-----------------------------------------------------------------
+%%% Dummy handler for lager 
+-record(state, {level :: {'mask', integer()},
+                formatter :: atom(),
+                format_config :: any()}).
+init(Opts) ->
+    Level = proplists:get_value(level,Opts,info),
+    Formatter = proplists:get_value(formatter,Opts,logger_bench_SUITE),
+    FormatConfig = proplists:get_value(format_config,Opts,?DEFAULT_FORMAT_CONFIG),
+    {ok,#state{level=lager_util:config_to_mask(Level),
+               formatter=Formatter,
+               format_config=FormatConfig}}.
+
+handle_call(get_loglevel, #state{level=Level} = State) ->
+    {ok, Level, State};
+handle_call({set_loglevel, Level}, State) ->
+   try lager_util:config_to_mask(Level) of
+        Levels ->
+            {ok, ok, State#state{level=Levels}}
+    catch
+        _:_ ->
+            {ok, {error, bad_log_level}, State}
+    end;
+handle_call(_Request, State) ->
+    {ok, ok, State}.
+
+handle_event({log, Message},
+    #state{level=L,formatter=Formatter,format_config=FormatConfig} = State) ->
+    case lager_util:is_loggable(Message, L, ?MODULE) of
+        true ->
+            Metadata =
+                case maps:from_list(lager_msg:metadata(Message)) of
+                    Meta = #{pid:=Pid} when is_pid(Pid) ->
+                        Meta;
+                    Meta = #{pid:=PidStr} when is_list(PidStr) ->
+                        Meta
+                end,
+            Log = #{level=>lager_msg:severity(Message),
+                    msg=>{report,lager_msg:message(Message)},
+                    meta=>Metadata},
+            io:put_chars(user, Formatter:format(Log,FormatConfig)),
+            {ok, State};
+        false ->
+            {ok, State}
+    end;
+handle_event(_Event, State) ->
+    {ok, State}.
diff --git a/lib/kernel/test/logger_disk_log_h_SUITE.erl b/lib/kernel/test/logger_disk_log_h_SUITE.erl
new file mode 100644
index 0000000000..c7c6137380
--- /dev/null
+++ b/lib/kernel/test/logger_disk_log_h_SUITE.erl
@@ -0,0 +1,1417 @@
+-module(logger_disk_log_h_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+-include_lib("kernel/src/logger_h_common.hrl").
+-include_lib("stdlib/include/ms_transform.hrl").
+-include_lib("kernel/include/file.hrl").
+
+-define(check_no_log, [] = test_server:messages_get()).
+
+-define(check(Expected),
+        receive {log,Expected} ->
+                [] = test_server:messages_get()
+        after 1000 ->
+                ct:fail({report_not_received,
+                         {line,?LINE},
+                         {got,test_server:messages_get()}})
+        end).
+
+-define(msg,"Log from "++atom_to_list(?FUNCTION_NAME)++
+            ":"++integer_to_list(?LINE)).
+-define(bin(Msg), list_to_binary(Msg++"\n")).
+-define(log_no(File,N), lists:concat([File,".",N])).
+-define(domain,#{domain=>[?MODULE]}).
+
+-define(SYNC_REP_INT, if is_atom(?FILESYNC_REPEAT_INTERVAL) -> 5500;
+                         true -> ?FILESYNC_REPEAT_INTERVAL + 500
+                      end).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    timer:start(),                              % to avoid progress report
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(TestHooksCase, Config) when
+      TestHooksCase == write_failure;
+      TestHooksCase == sync_failure ->
+    if ?TEST_HOOKS_TAB == undefined ->
+            {skip,"Define the TEST_HOOKS macro to run this test"};
+       true ->
+            ct:print("********** ~w **********", [TestHooksCase]),
+            Config
+    end;
+init_per_testcase(TestCase, Config) ->
+    ct:print("********** ~w **********", [TestCase]),
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [start_stop_handler,
+     create_log,
+     open_existing_log,
+     disk_log_opts,
+     default_formatter,
+     logging,
+     errors,
+     formatter_fail,
+     config_fail,
+     bad_input,
+     info_and_reset,
+     reconfig,
+     disk_log_sync,
+     disk_log_full,
+     disk_log_wrap,
+     disk_log_events,
+     write_failure,
+     sync_failure,
+     op_switch_to_sync,
+     op_switch_to_drop,
+     op_switch_to_flush,
+     limit_burst_disabled,
+     limit_burst_enabled_one,
+     limit_burst_enabled_period,
+     kill_disabled,
+     qlen_kill_new,
+     %% qlen_kill_std,
+     mem_kill_new,
+     %% mem_kill_std,
+     restart_after,
+     handler_requests_under_load
+    ].
+
+start_stop_handler(_Config) ->
+    ok = logger:add_handler(?MODULE, logger_disk_log_h, #{}),
+    {error,{already_exist,?MODULE}} =
+        logger:add_handler(?MODULE, logger_disk_log_h, #{}),
+    true = is_pid(whereis(?MODULE)),
+    ok = logger:remove_handler(?MODULE),
+    timer:sleep(500),
+    undefined = whereis(?MODULE).
+start_stop_handler(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+create_log(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    %% test new handler
+    Name1 = list_to_atom(lists:concat([?FUNCTION_NAME,"_A"])),
+    LogFile1 = filename:join(PrivDir, Name1),
+    ok = start_and_add(Name1, #{filter_default=>stop,
+                                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                                formatter=>{?MODULE,self()}},
+                       #{file=>LogFile1}),
+    logger:info("hello", ?domain),
+    logger_disk_log_h:disk_log_sync(Name1),
+    ct:pal("Checking contents of ~p", [?log_no(LogFile1,1)]),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"hello\n">>}, 5000),
+    
+    %% test second handler
+    Name2 = list_to_atom(lists:concat([?FUNCTION_NAME,"_B"])),
+    DLName = lists:concat([?FUNCTION_NAME,"_B_log"]),
+    LogFile2 = filename:join(PrivDir, DLName),
+    ok = start_and_add(Name2, #{filter_default=>stop,
+                                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                                formatter=>{?MODULE,self()}},
+                       #{file=>LogFile2}),
+    logger:info("dummy", ?domain),
+    logger_disk_log_h:disk_log_sync(Name2),
+    ct:pal("Checking contents of ~p", [?log_no(LogFile2,1)]),
+    try_read_file(?log_no(LogFile2,1), {ok,<<"dummy\n">>}, 5000),
+
+    remove_and_stop(Name1),    
+    remove_and_stop(Name2),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"hello\ndummy\n">>}, 1),
+    try_read_file(?log_no(LogFile2,1), {ok,<<"dummy\n">>}, 5000),
+    ok.
+
+open_existing_log(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    %% test new handler
+    HName = ?FUNCTION_NAME,
+    DLName = lists:concat([?FUNCTION_NAME,"_log"]),
+    LogFile1 = filename:join(PrivDir, DLName),
+    ok = start_and_add(HName, #{filter_default=>stop,
+                                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                                formatter=>{?MODULE,self()}},
+                       #{file=>LogFile1}),
+    logger:info("one", ?domain),
+    logger_disk_log_h:disk_log_sync(HName),
+    ct:pal("Checking contents of ~p", [?log_no(LogFile1,1)]),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"one\n">>}, 5000),
+    logger:info("two", ?domain),
+    ok = remove_and_stop(HName),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"one\ntwo\n">>}, 5000),
+
+    logger:info("two and a half", ?domain),
+
+    ok = start_and_add(HName, #{filter_default=>stop,
+                                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                                formatter=>{?MODULE,self()}},
+                       #{file=>LogFile1}),
+    logger:info("three", ?domain),
+    logger_disk_log_h:disk_log_sync(HName),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"one\ntwo\nthree\n">>}, 5000),
+    remove_and_stop(HName),
+    try_read_file(?log_no(LogFile1,1), {ok,<<"one\ntwo\nthree\n">>}, 5000).
+
+disk_log_opts(Config) ->
+    Get = fun(Key, PL) -> proplists:get_value(Key, PL) end,
+    PrivDir = ?config(priv_dir,Config),
+    WName = list_to_atom(lists:concat([?FUNCTION_NAME,"_W"])),
+    WFile = lists:concat([?FUNCTION_NAME,"_W_log"]),
+    Size = length("12345"),
+    ConfigW = #{filter_default=>stop,
+                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                formatter => {?MODULE,no_nl}},
+    WFileFull = filename:join(PrivDir, WFile),
+    DLOptsW = #{file => WFileFull,
+                type => wrap,
+                max_no_bytes => Size,
+                max_no_files => 2},
+    ok = start_and_add(WName, ConfigW, DLOptsW),
+    WInfo1 = disk_log:info(WName),
+    ct:log("Fullname = ~s", [WFileFull]),
+    {WFileFull,wrap,{Size,2},1} = {Get(file,WInfo1),Get(type,WInfo1),
+                                   Get(size,WInfo1),Get(current_file,WInfo1)},
+    logger:info("123", ?domain),
+    logger_disk_log_h:disk_log_sync(WName),
+    timer:sleep(500),
+    1 = Get(current_file, disk_log:info(WName)),
+
+    logger:info("45", ?domain),
+    logger_disk_log_h:disk_log_sync(WName),
+    timer:sleep(500),
+    1 = Get(current_file, disk_log:info(WName)),
+
+    logger:info("6", ?domain),
+    logger_disk_log_h:disk_log_sync(WName),
+    timer:sleep(500),
+    2 = Get(current_file, disk_log:info(WName)),
+
+    logger:info("7890", ?domain),
+    logger_disk_log_h:disk_log_sync(WName),
+    timer:sleep(500),
+    2 = Get(current_file, disk_log:info(WName)),
+
+    HName1 = list_to_atom(lists:concat([?FUNCTION_NAME,"_H1"])),
+    HFile1 = lists:concat([?FUNCTION_NAME,"_H1_log"]),
+    ConfigH = #{filter_default=>stop,
+                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                formatter => {?MODULE,no_nl}},
+    HFile1Full = filename:join(PrivDir, HFile1),
+    DLOptsH1 = #{file => HFile1Full,
+                 type => halt},
+    ok = start_and_add(HName1, ConfigH, DLOptsH1),
+    HInfo1 = disk_log:info(HName1),
+    ct:log("Fullname = ~s", [HFile1Full]),
+    {HFile1Full,halt,infinity} = {Get(file,HInfo1),Get(type,HInfo1),
+                                  Get(size,HInfo1)},
+    logger:info("12345", ?domain),
+    logger_disk_log_h:disk_log_sync(HName1),
+    timer:sleep(500),
+    1 = Get(no_written_items, disk_log:info(HName1)),
+
+    HName2 = list_to_atom(lists:concat([?FUNCTION_NAME,"_H2"])),
+    HFile2 = lists:concat([?FUNCTION_NAME,"_H2_log"]),
+    HFile2Full = filename:join(PrivDir, HFile2),
+    DLOptsH2 = DLOptsH1#{file => HFile2Full,
+                         max_no_bytes => 1000},
+    ok = start_and_add(HName2, ConfigH, DLOptsH2),
+    HInfo3 = disk_log:info(HName2),
+    ct:log("Fullname = ~s", [HFile2Full]),
+    {HFile2Full,halt,1000} = {Get(file,HInfo3),Get(type,HInfo3),
+                              Get(size,HInfo3)},
+    
+    remove_and_stop(WName),    
+    remove_and_stop(HName1),
+    remove_and_stop(HName2),    
+    ok.
+
+default_formatter(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    LogFile = filename:join(PrivDir,atom_to_list(?FUNCTION_NAME)),
+    HConfig = #{disk_log_opts => #{file=>LogFile},
+                filter_default=>log},
+    ct:pal("Log: ~p", [LogFile]),
+    ok = logger:add_handler(?MODULE, logger_disk_log_h, HConfig),
+    ok = logger:set_handler_config(?MODULE,formatter,
+                                   {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}),
+    LogName = lists:concat([LogFile, ".1"]),
+    logger:info("dummy"),
+    wait_until_written(LogName),
+    {ok,Bin} = file:read_file(LogName),
+    match = re:run(Bin, "=INFO REPORT====.*\ndummy", [{capture,none}]),
+    ok.
+default_formatter(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+logging(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    %% test new handler
+    Name = list_to_atom(lists:concat([?FUNCTION_NAME,"_1"])),
+    LogFile = filename:join(PrivDir, Name),
+    ok = start_and_add(Name, #{filter_default=>log,
+                               formatter=>{?MODULE,self()}},
+                       #{file => LogFile}),
+    MsgFormatter = fun(Term) -> {io_lib:format("Term:~p",[Term]),[]} end,
+    logger:info([{x,y}], #{report_cb => MsgFormatter}),
+    logger:info([{x,y}], #{}),
+    ct:pal("Checking contents of ~p", [?log_no(LogFile,1)]),   
+    try_read_file(?log_no(LogFile,1), {ok,<<"Term:[{x,y}]\n    x: y\n">>}, 5000).
+
+logging(cleanup, _Config) ->
+    Name = list_to_atom(lists:concat([?FUNCTION_NAME,"_1"])),
+    remove_and_stop(Name).
+
+errors(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    Name1 = list_to_atom(lists:concat([?FUNCTION_NAME,"_1"])),
+    LogFile1 = filename:join(PrivDir,Name1),
+    HConfig = #{disk_log_opts=>#{file=>LogFile1},
+                filter_default=>log,
+                formatter=>{?MODULE,self()}},
+    ok = logger:add_handler(Name1, logger_disk_log_h, HConfig),
+    {error,{already_exist,Name1}} =
+        logger:add_handler(Name1, logger_disk_log_h, #{}),
+ 
+    %%! TODO:
+    %%! Check how bad log_opts are handled!
+
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(Name1,
+                                  disk_log_opts,
+                                  #{file=>LogFile1,
+                                    type=>halt}),
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(Name1,id,new),
+
+    ok = logger:remove_handler(Name1),
+    {error,{not_found,Name1}} = logger:remove_handler(Name1),
+    ok.
+
+errors(cleanup, _Config) ->
+    Name1 = list_to_atom(lists:concat([?FUNCTION_NAME,"_1"])),
+    _ = logger:remove_handler(Name1).
+
+formatter_fail(Config) ->
+    PrivDir = ?config(priv_dir,Config),
+    Name = ?FUNCTION_NAME,
+    LogFile = filename:join(PrivDir,Name),
+    ct:pal("Log = ~p", [LogFile]),
+    HConfig = #{disk_log_opts => #{file=>LogFile},
+                filter_default=>stop,
+                filters=>?DEFAULT_HANDLER_FILTERS([?MODULE])},
+    %% no formatter!
+    logger:add_handler(Name, logger_disk_log_h, HConfig),
+    Pid = whereis(Name),
+    true = is_pid(Pid),
+    {ok,#{handlers:=H}} = logger:get_logger_config(),
+    true = lists:member(Name,H),
+
+    %% Formatter is added automatically
+    {ok,{_,#{formatter:={logger_formatter,_}}}} =
+        logger:get_handler_config(Name),
+    logger:info(M1=?msg,?domain),
+    Got1 = try_match_file(?log_no(LogFile,1),"=INFO REPORT====.*\n"++M1,5000),
+
+    ok = logger:set_handler_config(Name,formatter,{nonexistingmodule,#{}}),
+    logger:info(M2=?msg,?domain),
+    Got2 = try_match_file(?log_no(LogFile,1),
+                          Got1++"=INFO REPORT====.*\nFORMATTER CRASH: .*"++M2,
+                          5000),
+
+    ok = logger:set_handler_config(Name,formatter,{?MODULE,crash}),
+    logger:info(M3=?msg,?domain),
+    Got3 = try_match_file(?log_no(LogFile,1),
+                          Got2++"=INFO REPORT====.*\nFORMATTER CRASH: .*"++M3,
+                          5000),
+
+    ok = logger:set_handler_config(Name,formatter,{?MODULE,bad_return}),
+    logger:info(?msg,?domain),
+    try_match_file(?log_no(LogFile,1),
+                   Got3++"FORMATTER ERROR: bad_return_value",
+                   5000),
+
+    %% Check that handler is still alive and was never dead
+    Pid = whereis(Name),
+    {ok,#{handlers:=H}} = logger:get_logger_config(),
+    ok.
+
+formatter_fail(cleanup,_Config) ->
+    _ = logger:remove_handler(?FUNCTION_NAME),
+    ok.
+
+config_fail(_Config) ->
+    {error,{handler_not_added,{invalid_config,logger_disk_log_h,{bad,bad}}}} =
+        logger:add_handler(?MODULE,logger_disk_log_h,
+                           #{logger_disk_log_h => #{bad => bad},
+                             filter_default=>log,
+                             formatter=>{?MODULE,self()}}),
+    {error,{handler_not_added,{invalid_levels,{42,42,_}}}} =
+        logger:add_handler(?MODULE,logger_disk_log_h,
+                           #{logger_disk_log_h => #{toggle_sync_qlen=>42,
+                                                    drop_new_reqs_qlen=>42}}),
+
+    ok = logger:add_handler(?MODULE,logger_disk_log_h,
+                            #{filter_default=>log,
+                              formatter=>{?MODULE,self()}}),
+    %% can't change the disk log options for a log already in use
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(?MODULE,disk_log_opts,
+                                  #{max_no_files=>2}),
+    %% can't change name of an existing handler
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(?MODULE,id,bad),
+    %% incorrect values of OP params  
+    {error,{invalid_levels,_}} =
+        logger:set_handler_config(?MODULE,logger_disk_log_h,
+                                  #{toggle_sync_qlen=>100,
+                                    flush_reqs_qlen=>99}),
+    %% invalid name of config parameter
+    {error,{invalid_config,logger_disk_log_h,{filesync_rep_int,2000}}} =
+        logger:set_handler_config(?MODULE, logger_disk_log_h,
+                                  #{filesync_rep_int => 2000}),
+    ok.
+config_fail(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+bad_input(_Config) ->
+    {error,{badarg,{disk_log_sync,["BadType"]}}} =
+        logger_disk_log_h:disk_log_sync("BadType"),
+    {error,{badarg,{info,["BadType"]}}} = logger_disk_log_h:info("BadType"),
+    {error,{badarg,{reset,["BadType"]}}} = logger_disk_log_h:reset("BadType").
+
+info_and_reset(_Config) ->
+    ok = logger:add_handler(?MODULE,logger_disk_log_h,
+                            #{filter_default=>log,
+                              formatter=>{?MODULE,self()}}),
+    #{id := ?MODULE} = logger_disk_log_h:info(?MODULE),
+    ok = logger_disk_log_h:reset(?MODULE).
+info_and_reset(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+reconfig(Config) ->
+    Dir = ?config(priv_dir,Config),
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+    #{id := ?MODULE,
+      toggle_sync_qlen := ?TOGGLE_SYNC_QLEN,
+      drop_new_reqs_qlen := ?DROP_NEW_REQS_QLEN,
+      flush_reqs_qlen := ?FLUSH_REQS_QLEN,
+      enable_burst_limit := ?ENABLE_BURST_LIMIT,
+      burst_limit_size := ?BURST_LIMIT_SIZE,
+      burst_window_time := ?BURST_WINDOW_TIME,
+      enable_kill_overloaded := ?ENABLE_KILL_OVERLOADED,
+      handler_overloaded_qlen := ?HANDLER_OVERLOADED_QLEN,
+      handler_overloaded_mem := ?HANDLER_OVERLOADED_MEM,
+      handler_restart_after := ?HANDLER_RESTART_AFTER,
+      filesync_repeat_interval := ?FILESYNC_REPEAT_INTERVAL,
+      log_opts := #{type := ?DISK_LOG_TYPE,
+                    max_no_files := ?DISK_LOG_MAX_NO_FILES,
+                    max_no_bytes := ?DISK_LOG_MAX_NO_BYTES,
+                    file := _DiskLogFile}} =
+        logger_disk_log_h:info(?MODULE),
+
+    ok = logger:set_handler_config(?MODULE, logger_disk_log_h,
+                                   #{toggle_sync_qlen => 1,
+                                     drop_new_reqs_qlen => 2,
+                                     flush_reqs_qlen => 3,
+                                     enable_burst_limit => false,
+                                     burst_limit_size => 10,
+                                     burst_window_time => 10,
+                                     enable_kill_overloaded => true,
+                                     handler_overloaded_qlen => 100000,
+                                     handler_overloaded_mem => 10000000,
+                                     handler_restart_after => never,
+                                     filesync_repeat_interval => no_repeat}),
+    #{id := ?MODULE,
+      toggle_sync_qlen := 1,
+      drop_new_reqs_qlen := 2,
+      flush_reqs_qlen := 3,
+      enable_burst_limit := false,
+      burst_limit_size := 10,
+      burst_window_time := 10,
+      enable_kill_overloaded := true,
+      handler_overloaded_qlen := 100000,
+      handler_overloaded_mem := 10000000,
+      handler_restart_after := never,
+      filesync_repeat_interval := no_repeat} =
+        logger_disk_log_h:info(?MODULE),
+
+    ok = logger:remove_handler(?MODULE),
+
+    File = filename:join(Dir, "logfile"),
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()},
+                              disk_log_opts=>
+                                  #{type => halt,
+                                    max_no_files => 1,
+                                    max_no_bytes => 1024,
+                                    file => File}}),
+    #{log_opts := #{type := halt,
+                    max_no_files := 1,
+                    max_no_bytes := 1024,
+                    file := File}} =
+        logger_disk_log_h:info(?MODULE),
+    ok.
+
+reconfig(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+disk_log_sync(Config) ->
+    Dir = ?config(priv_dir,Config),
+    File = filename:join(Dir, ?FUNCTION_NAME),
+    Log = lists:concat([File,".1"]),
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{disk_log_opts => #{file => File},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,nl}}),
+
+    start_tracer([{?MODULE,format,2},
+                  {disk_log,blog,2},
+                  {disk_log,sync,1}],
+                 [{formatter,"first"},
+                  {disk_log,blog},
+                  {disk_log,sync}]),
+
+    logger:info("first", ?domain),
+    %% wait for automatic disk_log_sync
+    check_tracer(?FILESYNC_REPEAT_INTERVAL*2),
+    
+    start_tracer([{?MODULE,format,2},
+                  {disk_log,blog,2},
+                  {disk_log,sync,1}],
+                 [{formatter,"second"},
+                  {formatter,"third"},
+                  {disk_log,blog},
+                  {disk_log,blog},
+                  {disk_log,sync}]),
+    %% two log requests in fast succession will make the handler skip
+    %% an automatic disk log sync
+    logger:info("second", ?domain),
+    logger:info("third", ?domain),
+    %% do explicit disk_log_sync
+    logger_disk_log_h:disk_log_sync(?MODULE),
+    check_tracer(100),
+
+    %% check that if there's no repeated disk_log_sync active,
+    %% a disk_log_sync is still performed when handler goes idle
+    logger:set_handler_config(?MODULE, logger_disk_log_h,
+                              #{filesync_repeat_interval => no_repeat}),
+    no_repeat = maps:get(filesync_repeat_interval,
+                         logger_disk_log_h:info(?MODULE)),
+
+    start_tracer([{?MODULE,format,2},
+                  {disk_log,blog,2},
+                  {disk_log,sync,1}],
+                 [{formatter,"fourth"},
+                  {disk_log,blog},
+                  {formatter,"fifth"},
+                  {disk_log,blog},
+                  {disk_log,sync}]),
+
+    logger:info("fourth", ?domain),
+    timer:sleep(?IDLE_DETECT_TIME_MSEC*2),
+    logger:info("fifth", ?domain),
+    %% wait for automatic disk_log_sync
+    check_tracer(?IDLE_DETECT_TIME_MSEC*2),
+
+    try_read_file(Log, {ok,<<"first\nsecond\nthird\nfourth\nfifth\n">>}, 1000),
+    
+    %% switch repeated disk_log_sync on and verify that the looping works
+    SyncInt = 1000,
+    WaitT = 4500,
+    OneSync = {logger_disk_log_h,handle_cast,repeated_disk_log_sync},
+    %% receive 1 initial repeated_disk_log_sync, then 1 per sec
+    start_tracer([{logger_disk_log_h,handle_cast,2}],
+                 [OneSync || _ <- lists:seq(1, 1 + trunc(WaitT/SyncInt))]),
+
+    logger:set_handler_config(?MODULE, logger_disk_log_h,
+                              #{filesync_repeat_interval => SyncInt}),
+    SyncInt = maps:get(filesync_repeat_interval,
+                       logger_disk_log_h:info(?MODULE)),
+    timer:sleep(WaitT),
+    logger:set_handler_config(?MODULE, logger_disk_log_h,
+                              #{filesync_repeat_interval => no_repeat}),    
+    check_tracer(100),
+    ok.
+disk_log_sync(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+disk_log_wrap(Config) ->
+    Get = fun(Key, PL) -> proplists:get_value(Key, PL) end,
+    Dir = ?config(priv_dir,Config),
+    File = filename:join(Dir, ?FUNCTION_NAME),
+    ct:pal("Log = ~p", [File]),
+    MaxFiles = 3,
+    MaxBytes = 5,
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()},
+                              disk_log_opts=>
+                                  #{type => wrap,
+                                    max_no_files => MaxFiles,
+                                    max_no_bytes => MaxBytes,
+                                    file => File}}),
+    Info = disk_log:info(?MODULE),
+    {File,wrap,{MaxBytes,MaxFiles},1} =
+        {Get(file,Info),Get(type,Info),Get(size,Info),Get(current_file,Info)},
+    Tester = self(),
+    TraceFun = fun({trace,_,call,{Mod,Func,Details}}, Pid) ->
+                       Pid ! {trace,Mod,Func,Details},
+                       Pid
+               end,
+    {ok,_} = dbg:tracer(process, {TraceFun, Tester}),
+    {ok,_} = dbg:p(whereis(?MODULE), [c]),
+    {ok,_} = dbg:tp(logger_disk_log_h, handle_info, 2, []),
+
+    Text = [34 + rand:uniform(126-34) || _ <- lists:seq(1,MaxBytes)],
+    ct:pal("String = ~p (~w)", [Text, erts_debug:size(Text)]),
+    %% fill first file
+    lists:foreach(fun(N) ->
+                          Log = lists:concat([File,".",N]),
+                          logger:info(Text, ?domain),
+                          wait_until_written(Log),
+                          ct:pal("N = ~w",
+                                 [N = Get(current_file,
+                                          disk_log:info(?MODULE))])
+                  end, lists:seq(1,MaxFiles)),
+
+    %% wait for trace messages
+    timer:sleep(1000),
+    dbg:stop_clear(),
+    Received = lists:flatmap(fun({trace,_M,handle_info,
+                                  [{disk_log,_Node,_Name,What},_]}) ->
+                                     [{trace,What}];
+                                ({log,_}) ->
+                                     []
+                             end, test_server:messages_get()),
+    ct:pal("Trace =~n~p", [Received]),
+    Received = [{trace,{wrap,0}} || _ <- lists:seq(1,MaxFiles-1)],
+    ok.
+
+disk_log_wrap(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+disk_log_full(Config) ->
+    Dir = ?config(priv_dir,Config),
+    File = filename:join(Dir, ?FUNCTION_NAME),
+    ct:pal("Log = ~p", [File]),
+    MaxBytes = 50,
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()},
+                              disk_log_opts=>
+                                  #{type => halt,
+                                    max_no_files => 1,
+                                    max_no_bytes => MaxBytes,
+                                    file => File}}),
+
+    Tester = self(),
+    TraceFun = fun({trace,_,call,{Mod,Func,Details}}, Pid) ->
+                       Pid ! {trace,Mod,Func,Details},
+                       Pid
+               end,
+    {ok,_} = dbg:tracer(process, {TraceFun, Tester}),
+    {ok,_} = dbg:p(whereis(?MODULE), [c]),
+    {ok,_} = dbg:tp(logger_disk_log_h, handle_info, 2, []),
+
+    NoOfChars = 5,
+    Text = [34 + rand:uniform(126-34) || _ <- lists:seq(1,NoOfChars)],
+    [logger:info(Text, ?domain) || _ <- lists:seq(1,trunc(MaxBytes/NoOfChars)+1)],
+
+    %% wait for trace messages
+    timer:sleep(2000),
+    dbg:stop_clear(),
+    Received = lists:flatmap(fun({trace,_M,handle_info,
+                                  [{disk_log,_Node,_Name,What},_]}) ->
+                                     [{trace,What}];
+                                ({log,_}) ->
+                                     []
+                             end, test_server:messages_get()),
+    ct:pal("Trace =~n~p", [Received]),
+    [{trace,full},
+     {trace,{error_status,{error,{full,_}}}}] = Received,
+    ok.
+disk_log_full(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).    
+
+disk_log_events(Config) ->
+    Node = node(),
+    Log = ?MODULE,
+    ok = logger:add_handler(?MODULE,
+                            logger_disk_log_h,
+                            #{filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+
+    %% Events copied from disk_log API
+    Events =
+        [{disk_log, Node, Log, {wrap, 0}},
+         {disk_log, Node, Log, {truncated, 0}},
+         {disk_log, Node, Log, {read_only, 42}},
+         {disk_log, Node, Log, {blocked_log, 42}},
+         {disk_log, Node, Log, {format_external, 42}},
+         {disk_log, Node, Log, full},
+         {disk_log, Node, Log, {error_status, ok}}],
+    
+    Tester = self(),
+    TraceFun = fun({trace,_,call,{Mod,Func,Details}}, Pid) ->
+                       Pid ! {trace,Mod,Func,Details},
+                       Pid
+               end,
+    {ok,_} = dbg:tracer(process, {TraceFun, Tester}),
+    {ok,_} = dbg:p(whereis(?MODULE), [c]),
+    {ok,_} = dbg:tp(logger_disk_log_h, handle_info, 2, []),
+    
+    [whereis(?MODULE) ! E || E <- Events],
+    %% wait for trace messages
+    timer:sleep(2000),
+    dbg:stop_clear(),
+    Received = lists:map(fun({trace,_M,handle_info,
+                              [Got,_]}) -> Got
+                         end, test_server:messages_get()),
+    ct:pal("Trace =~n~p", [Received]),
+    NoOfEvents = length(Events),
+    NoOfEvents = length(Received),
+    lists:foreach(fun(Event) ->
+                          true = lists:member(Event, Received)
+                  end, Received),
+    ok.
+disk_log_events(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).    
+
+write_failure(Config) ->
+    Dir = ?config(priv_dir, Config),
+    File = filename:join(Dir, ?FUNCTION_NAME),
+    Log = lists:concat([File,".1"]),
+    ct:pal("Log = ~p", [Log]),
+
+    Node = start_h_on_new_node(Config, ?FUNCTION_NAME, File),
+    false = (undefined == rpc:call(Node, ets, whereis, [?TEST_HOOKS_TAB])),
+    rpc:call(Node, ets, insert, [?TEST_HOOKS_TAB,{tester,self()}]),
+    rpc:call(Node, ?MODULE, set_internal_log, [?MODULE,internal_log]),
+    rpc:call(Node, ?MODULE, set_result, [disk_log_blog,ok]),
+    HState = rpc:call(Node, logger_disk_log_h, info, [?STANDARD_HANDLER]),
+    ct:pal("LogOpts = ~p", [LogOpts = maps:get(log_opts, HState)]),
+
+    ok = log_on_remote_node(Node, "Logged1"),
+    rpc:call(Node, logger_disk_log_h, disk_log_sync, [?STANDARD_HANDLER]),
+    ?check_no_log,
+    try_read_file(Log, {ok,<<"Logged1\n">>}, ?SYNC_REP_INT),
+
+    rpc:call(Node, ?MODULE, set_result, [disk_log_blog,{error,no_such_log}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+
+    ?check({error,{?STANDARD_HANDLER,log,LogOpts,{error,no_such_log}}}),
+    
+    ok = log_on_remote_node(Node, "No second error printout"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result, [disk_log_blog,
+                                         {error,{full,?STANDARD_HANDLER}}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    ?check({error,{?STANDARD_HANDLER,log,LogOpts,
+                   {error,{full,?STANDARD_HANDLER}}}}),
+
+    rpc:call(Node, ?MODULE, set_result, [disk_log_blog,ok]),
+    ok = log_on_remote_node(Node, "Logged2"),
+    rpc:call(Node, logger_disk_log_h, disk_log_sync, [?STANDARD_HANDLER]),
+    ?check_no_log,
+    try_read_file(Log, {ok,<<"Logged1\nLogged2\n">>}, ?SYNC_REP_INT),
+    ok.
+write_failure(cleanup, _Config) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes].
+
+
+sync_failure(Config) ->
+    Dir = ?config(priv_dir, Config),
+    FileName = lists:concat([?MODULE,"_",?FUNCTION_NAME]),
+    File = filename:join(Dir, FileName),
+    Log = lists:concat([File,".1"]),
+
+    Node = start_h_on_new_node(Config, ?FUNCTION_NAME, File),
+    false = (undefined == rpc:call(Node, ets, whereis, [?TEST_HOOKS_TAB])),
+    rpc:call(Node, ets, insert, [?TEST_HOOKS_TAB,{tester,self()}]),
+    rpc:call(Node, ?MODULE, set_internal_log, [?MODULE,internal_log]),
+    rpc:call(Node, ?MODULE, set_result, [disk_log_sync,ok]),
+    HState = rpc:call(Node, logger_disk_log_h, info, [?STANDARD_HANDLER]),
+    LogOpts = maps:get(log_opts, HState),
+    
+    SyncInt = 500,
+    ok = rpc:call(Node, logger, set_handler_config,
+                  [?STANDARD_HANDLER, logger_disk_log_h,
+                   #{filesync_repeat_interval => SyncInt}]),
+    Info = rpc:call(Node, logger_disk_log_h, info, [?STANDARD_HANDLER]),
+    SyncInt = maps:get(filesync_repeat_interval, Info),
+    
+    ok = log_on_remote_node(Node, "Logged1"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result, [disk_log_sync,{error,no_such_log}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    
+    ?check({error,{?STANDARD_HANDLER,sync,LogOpts,{error,no_such_log}}}),
+
+    ok = log_on_remote_node(Node, "No second error printout"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result,
+             [disk_log_sync,{error,{blocked_log,?STANDARD_HANDLER}}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    ?check({error,{?STANDARD_HANDLER,sync,LogOpts,
+                   {error,{blocked_log,?STANDARD_HANDLER}}}}),
+
+    rpc:call(Node, ?MODULE, set_result, [disk_log_sync,ok]),
+    ok = log_on_remote_node(Node, "Logged2"),
+    ?check_no_log,
+    ok.
+sync_failure(cleanup, _Config) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes].
+
+start_h_on_new_node(_Config, Func, File) ->
+    Pa = filename:dirname(code:which(?MODULE)),
+    Dest =
+        case os:type() of
+            {win32,_} ->
+                lists:concat([" {disk_log,\\\"",File,"\\\"}"]);
+            _ ->
+                lists:concat([" \'{disk_log,\"",File,"\"}\'"])
+        end,
+    Args = lists:concat([" -kernel ",logger_dest,Dest," -pa ",Pa]),
+    NodeName = lists:concat([?MODULE,"_",Func]),
+    ct:pal("Starting ~s with ~tp", [NodeName,Args]),
+    {ok,Node} = test_server:start_node(NodeName, peer, [{args, Args}]),
+    Pid = rpc:call(Node,erlang,whereis,[?STANDARD_HANDLER]),
+    true = is_pid(Pid),
+    ok = rpc:call(Node,logger,set_handler_config,[?STANDARD_HANDLER,formatter,
+                                                  {?MODULE,nl}]),
+    Node.
+
+log_on_remote_node(Node,Msg) ->
+    _ = spawn_link(Node,
+                   fun() -> erlang:group_leader(whereis(user),self()),
+                            logger:info(Msg)
+                   end),
+    ok.
+
+%% functions for test hook macros to be called by rpc
+set_internal_log(Mod, Func) ->
+    ?set_internal_log({Mod,Func}).
+set_result(Op, Result) ->
+    ?set_result(Op, Result).
+set_defaults() ->
+    ?set_defaults().
+
+%% internal log function that sends the term to the test case process
+internal_log(Type, Term) ->
+    [{tester,Tester}] = ets:lookup(?TEST_HOOKS_TAB, tester),
+    Tester ! {log,{Type,Term}},
+    logger:internal_log(Type, Term),
+    ok.
+
+
+%%%-----------------------------------------------------------------
+%%% Overload protection tests
+
+op_switch_to_sync(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{toggle_sync_qlen => 3,
+                                                 drop_new_reqs_qlen => 501,
+                                                 flush_reqs_qlen => 2000,
+                                                 enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    NumOfReqs = count_lines(Log),
+    ok = file:delete(Log).
+op_switch_to_sync(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_drop(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{toggle_sync_qlen => 2,
+                                                 drop_new_reqs_qlen => 3,
+                                                 flush_reqs_qlen => 600,
+                                                 enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages dropped = ~w (~w)",
+           [NumOfReqs-Logged,NumOfReqs]),
+    true = (Logged < NumOfReqs),
+    ok = file:delete(Log).
+op_switch_to_drop(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_flush() ->
+    [{timetrap,{seconds,60}}].
+op_switch_to_flush(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    
+    %% it's important that both async and sync requests have been queued
+    %% when the flush happens (verify with coverage of flush_log_requests/2)
+    
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{toggle_sync_qlen => 2,
+                                                 drop_new_reqs_qlen => 99,
+                                                 flush_reqs_qlen => 100,
+                                                 enable_burst_limit => false}},    
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 1000,
+    Procs = 500,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages flushed/dropped = ~w (~w)",
+           [(NumOfReqs*Procs)-Logged,NumOfReqs*Procs]),
+    true = (Logged < (NumOfReqs*Procs)),
+    ok = file:delete(Log).
+op_switch_to_flush(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+
+limit_burst_disabled(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{enable_burst_limit => false,
+                                                 burst_limit_size => 10,
+                                                 burst_window_time => 2000,
+                                                 drop_new_reqs_qlen => 200,
+                                                 flush_reqs_qlen => 300}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    NumOfReqs = Logged.
+limit_burst_disabled(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+limit_burst_enabled_one(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    ReqLimit = 10,
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{enable_burst_limit => true,
+                                                 burst_limit_size => ReqLimit,
+                                                 burst_window_time => 2000,
+                                                 drop_new_reqs_qlen => 200,
+                                                 flush_reqs_qlen => 300}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    ReqLimit = Logged.
+limit_burst_enabled_one(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+limit_burst_enabled_period(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    ReqLimit = 10,
+    BurstTWin = 1000,
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{enable_burst_limit => true,
+                                                 burst_limit_size => ReqLimit,
+                                                 burst_window_time => BurstTWin,
+                                                 drop_new_reqs_qlen => 20000,
+                                                 flush_reqs_qlen => 20001}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    
+    Windows = 3,
+    Sent = send_burst({t,BurstTWin*Windows}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages sent = ~w~nNumber of messages logged = ~w",
+           [Sent,Logged]),
+    ok = file:delete(Log),
+    true = (Logged > (ReqLimit*Windows)) andalso
+           (Logged < (ReqLimit*(Windows+2))).
+limit_burst_enabled_period(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+kill_disabled(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_disk_log_h=>DLHConfig#{enable_kill_overloaded=>false,
+                                               handler_overloaded_qlen=>10,
+                                               handler_overloaded_mem=>100}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    true = is_pid(whereis(?MODULE)),
+    ok.
+kill_disabled(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+qlen_kill_new(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    Pid0 = whereis(?MODULE),
+    {_,Mem0} = process_info(Pid0, memory),
+    RestartAfter = 2000,
+    NewHConfig =
+        HConfig#{logger_disk_log_h =>
+                     DLHConfig#{enable_kill_overloaded=>true,
+                                handler_overloaded_qlen=>10,
+                                handler_overloaded_mem=>Mem0+50000,
+                                handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    MRef = erlang:monitor(process, Pid0),
+    NumOfReqs = 100,
+    Procs = 2,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    %% send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    receive
+        {'DOWN', MRef, _, _, Info} ->
+           case Info of
+                {shutdown,{overloaded,?MODULE,QLen,Mem}} ->
+                    ct:pal("Terminated with qlen = ~w, mem = ~w", [QLen,Mem]);
+                killed ->
+                    ct:pal("Slow shutdown, handler process was killed!", [])
+            end,
+            timer:sleep(RestartAfter + 1000),
+            true = is_pid(whereis(?MODULE)),
+            ok
+    after
+        5000 ->
+            Info = logger_disk_log_h:info(?MODULE),
+            ct:pal("Handler state = ~p", [Info]),
+            ct:fail("Handler not dead! It should not have survived this!")
+    end.
+qlen_kill_new(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+mem_kill_new(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    Pid0 = whereis(?MODULE),
+    {_,Mem0} = process_info(Pid0, memory),
+    RestartAfter = 2000,
+    NewHConfig =
+        HConfig#{logger_disk_log_h =>
+                     DLHConfig#{enable_kill_overloaded=>true,
+                                handler_overloaded_qlen=>50000,
+                                handler_overloaded_mem=>Mem0+500,
+                                handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    MRef = erlang:monitor(process, Pid0),
+    NumOfReqs = 100,
+    Procs = 2,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    %% send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    receive
+        {'DOWN', MRef, _, _, Info} ->
+            case Info of
+                {shutdown,{overloaded,?MODULE,QLen,Mem}} ->
+                    ct:pal("Terminated with qlen = ~w, mem = ~w", [QLen,Mem]);
+                killed ->
+                    ct:pal("Slow shutdown, handler process was killed!", [])
+            end,
+            timer:sleep(RestartAfter * 2),
+            true = is_pid(whereis(?MODULE)),
+            ok
+    after
+        5000 ->
+            Info = logger_disk_log_h:info(?MODULE),
+            ct:pal("Handler state = ~p", [Info]),
+            ct:fail("Handler not dead! It should not have survived this!")
+    end.
+mem_kill_new(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+restart_after(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig1 =
+        HConfig#{logger_disk_log_h=>DLHConfig#{enable_kill_overloaded=>true,
+                                               handler_overloaded_qlen=>10,
+                                               handler_restart_after=>never}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig1),
+    MRef1 = erlang:monitor(process, whereis(?MODULE)),
+    %% kill handler
+    send_burst({n,100}, {spawn,2,0}, {chars,79}, info),
+    receive
+        {'DOWN', MRef1, _, _, _Info1} ->
+            timer:sleep(?HANDLER_RESTART_AFTER + 1000),
+            undefined = whereis(?MODULE),
+            ok
+    after
+        5000 ->
+            ct:fail("Handler not dead! It should not have survived this!")
+    end,
+    
+    {Log,_,_} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    RestartAfter = 2000,
+    NewHConfig2 =
+        HConfig#{logger_disk_log_h=>DLHConfig#{enable_kill_overloaded=>true,
+                                               handler_overloaded_qlen=>10,
+                                               handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig2),
+    Pid0 = whereis(?MODULE),
+    MRef2 = erlang:monitor(process, Pid0),
+    %% kill handler
+    send_burst({n,100}, {spawn,2,0}, {chars,79}, info),
+    receive
+        {'DOWN', MRef2, _, _, _Info2} ->
+            timer:sleep(RestartAfter + 1000),
+            Pid1 = whereis(?MODULE),
+            true = is_pid(Pid1),
+            false = (Pid1 == Pid0),
+            ok
+    after
+        5000 ->
+            ct:fail("Handler not dead! It should not have survived this!")
+    end,
+    ok.
+restart_after(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+%% send handler requests (filesync, info, reset, change_config)
+%% during high load to verify that sync, dropping and flushing is
+%% handled correctly.
+handler_requests_under_load() ->
+    [{timetrap,{seconds,60}}].
+handler_requests_under_load(Config) ->
+    {Log,HConfig,DLHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_disk_log_h => DLHConfig#{toggle_sync_qlen => 2,
+                                                 drop_new_reqs_qlen => 1000,
+                                                 flush_reqs_qlen => 2000,
+                                                 enable_burst_limit => false}},   
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    Pid = spawn_link(fun() -> send_requests(?MODULE, 1, [{disk_log_sync,[]},
+                                                         {info,[]},
+                                                         {reset,[]},
+                                                         {change_config,[]}])
+                     end),
+    Procs = 100,
+    Sent = Procs * send_burst({n,5000}, {spawn,Procs,10}, {chars,79}, info),
+    Pid ! {self(),finish},
+    ReqResult = receive {Pid,Result} -> Result end,
+    Logged = count_lines(Log),
+    ct:pal("Number of messages sent = ~w~nNumber of messages logged = ~w",
+           [Sent,Logged]),
+    FindError = fun(Res) ->
+                        [E || E <- Res,
+                              is_tuple(E) andalso (element(1,E) == error)]
+                end,
+    Errors = [{Req,FindError(Res)} || {Req,Res} <- ReqResult],
+    NoOfReqs = lists:foldl(fun({_,Res}, N) -> N + length(Res) end, 0, ReqResult),
+    ct:pal("~w requests made. Errors: ~n~p", [NoOfReqs,Errors]),
+    ok = file:delete(Log).
+handler_requests_under_load(cleanup, Config) ->
+    ok = stop_handler(?MODULE).
+
+send_requests(HName, TO, Reqs = [{Req,Res}|Rs]) ->
+    receive
+        {From,finish} ->
+            From ! {self(),Reqs}
+    after
+        TO ->
+            Result =
+                case Req of
+                    change_config ->
+                        logger:set_handler_config(HName, logger_disk_log_h,
+                                                  #{enable_kill_overloaded =>
+                                                        false});
+                    Func ->
+                        logger_disk_log_h:Func(HName)
+                end,
+            send_requests(HName, TO, Rs ++ [{Req,[Result|Res]}])
+    end.
+
+%%%-----------------------------------------------------------------
+%%% 
+start_handler(Name, FuncName, Config) ->
+    Dir = ?config(priv_dir,Config),
+    File = filename:join(Dir, FuncName),
+    ct:pal("Logging to ~tp", [File]),
+    ok = logger:add_handler(Name,
+                            logger_disk_log_h,
+                            #{disk_log_opts=>#{file => File,
+                                               max_no_files => 1,
+                                               max_no_bytes => 100000000},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([Name]),
+                              formatter=>{?MODULE,op}}),
+    {ok,{_,HConfig = #{logger_disk_log_h := DLHConfig}}} =
+        logger:get_handler_config(Name),
+    {lists:concat([File,".1"]),HConfig,DLHConfig}.
+    
+stop_handler(Name) ->
+    ok = logger:remove_handler(Name),
+    ct:pal("Handler ~p stopped!", [Name]).    
+
+send_burst(NorT, Type, {chars,Sz}, Class) ->
+    Text = [34 + rand:uniform(126-34) || _ <- lists:seq(1,Sz)],
+    case NorT of
+        {n,N} ->
+            %% process_flag(priority, high),
+            send_n_burst(N, Type, Text, Class),
+            %% process_flag(priority, normal),
+            N;
+        {t,T} ->
+            ct:pal("Sending messages sequentially for ~w ms", [T]),
+            T0 = erlang:monotonic_time(millisecond),
+            send_t_burst(T0, T, Text, Class, 0)
+    end.
+
+send_n_burst(0, _, _Text, _Class) ->
+    ok;
+send_n_burst(N, seq, Text, Class) ->
+    ok = logger:Class(Text, ?domain),
+    send_n_burst(N-1, seq, Text, Class);
+send_n_burst(N, {spawn,Ps,TO}, Text, Class) ->
+    ct:pal("~w processes each sending ~w messages", [Ps,N]),
+    PerProc = fun() -> 
+                      send_n_burst(N, seq, Text, Class)
+              end,
+    MRefs = [begin if TO == 0 -> ok; true -> timer:sleep(TO) end,
+                   monitor(process,spawn_link(PerProc)) end ||
+                _ <- lists:seq(1,Ps)],
+    lists:foreach(fun(MRef) ->
+                          receive
+                              {'DOWN', MRef, _, _, _} ->
+                                  ok
+                          end
+                  end, MRefs),
+    ct:pal("Message burst sent", []),
+    ok.
+
+send_t_burst(T0, T, Text, Class, N) ->
+    T1 = erlang:monotonic_time(millisecond),
+    if (T1-T0) > T ->
+            N;
+       true ->
+            ok = logger:Class(Text, ?domain),
+            send_t_burst(T0, T, Text, Class, N+1)
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Formatter callback
+%%% Using this to send the formatted string back to the test case
+%%% process - so it can check for logged events.
+format(_,bad_return) ->
+    bad_return;
+format(_,crash) ->
+    erlang:error(formatter_crashed);
+format(#{msg:={report,R},meta:=#{report_cb:=Fun}}=Log,Config) ->
+    format(Log#{msg=>Fun(R)},Config);
+format(#{msg:={string,String0}},no_nl) ->
+    String = unicode:characters_to_list(String0),
+    String;
+format(#{msg:={string,String0}},nl) ->
+    String = unicode:characters_to_list(String0),
+    String++"\n";
+format(#{msg:={string,String0}},op) ->
+    String = unicode:characters_to_list(String0),
+    String++"\n";
+format(#{msg:={report,#{label:={supervisor,progress}}}},op) ->
+    "";
+format(#{msg:={report,#{label:={gen_server,terminate}}}},op) ->
+    "";
+format(#{msg:={report,#{label:={proc_lib,crash}}}},op) ->
+    "";
+format(#{msg:={F,A}},Pid) when is_list(F), is_list(A) ->
+    String = lists:flatten(io_lib:format(F,A)),
+    Pid ! {log,String},
+    String++"\n";
+format(#{msg:={string,String0}},Pid) ->
+    String = unicode:characters_to_list(String0),
+    Pid ! {log,String},
+    String++"\n";
+format(Msg,Tag) ->
+    Error = {unexpected_format,Msg,Tag},
+    erlang:display(Error),
+    exit(Error).
+
+remove(Handler, LogName) ->
+    logger_disk_log_h:remove(Handler, LogName),
+    HState = #{log_names := Logs} = logger_disk_log_h:info(),
+    false = maps:is_key(LogName, HState),
+    false = lists:member(LogName, Logs),
+    false = logger_config:exist(logger, LogName),
+    {error,no_such_log} = disk_log:info(LogName),
+    ok.
+
+start_and_add(Name, Config, LogOpts) ->
+    ct:pal("Adding handler ~w with: ~p",
+           [Name,Config#{disk_log_opts=>LogOpts}]),
+    ok = logger:add_handler(Name, logger_disk_log_h,
+                            Config#{disk_log_opts=>LogOpts}),
+    Pid = whereis(Name),
+    true = is_pid(Pid),
+    Name = proplists:get_value(name, disk_log:info(Name)),
+    ok.
+ 
+remove_and_stop(Handler) ->
+    ok = logger:remove_handler(Handler),
+    timer:sleep(500),
+    undefined = whereis(Handler),
+    ok.
+
+try_read_file(FileName, Expected, Time) ->
+    try_read_file(FileName, Expected, Time, undefined).
+
+try_read_file(FileName, Expected, Time, _) when Time > 0 ->
+    case file:read_file(FileName) of
+        Expected ->
+            ok;
+        Error = {error,_Reason} ->
+            erlang:error(Error);
+        SomethingElse ->
+            ct:pal("try_read_file read unexpected: ~p~n", [SomethingElse]),
+            timer:sleep(500),
+            try_read_file(FileName, Expected, Time-500, SomethingElse)
+    end;
+
+try_read_file(_, _, _, Incorrect) ->
+    ct:pal("try_read_file got incorrect pattern: ~p~n", [Incorrect]),
+    erlang:error({error,not_matching_pattern,Incorrect}).
+
+try_match_file(FileName, Pattern, Time) ->
+    try_match_file(FileName, Pattern, Time, <<>>).
+
+try_match_file(FileName, Pattern, Time, _) when Time > 0 ->
+    case file:read_file(FileName) of
+        {ok, Bin} ->
+            case re:run(Bin,Pattern,[{capture,none}]) of
+                match ->
+                    unicode:characters_to_list(Bin);
+                _ ->
+                    timer:sleep(100),
+                    try_match_file(FileName, Pattern, Time-100, Bin)
+            end;
+        Error ->
+            erlang:error(Error)
+    end;
+try_match_file(_,Pattern,_,Incorrect) ->
+    ct:pal("try_match_file did not match pattern: ~p~nGot: ~p~n",
+           [Pattern,Incorrect]),
+    erlang:error({error,not_matching_pattern,Pattern,Incorrect}).
+
+count_lines(File) ->
+    wait_until_written(File),
+    count_lines1(File).
+
+wait_until_written(File) ->
+    wait_until_written(File, -1).
+
+wait_until_written(File, Sz) ->
+    timer:sleep(2000),
+    case file:read_file_info(File) of
+        {ok,#file_info{size = Sz}} ->
+            timer:sleep(1000),
+            case file:read_file_info(File) of
+                {ok,#file_info{size = Sz1}} ->
+                    ok;
+                {ok,#file_info{size = Sz2}} ->
+                    wait_until_written(File, Sz2)
+            end;
+        {ok,#file_info{size = Sz1}} ->
+            wait_until_written(File, Sz1)
+    end.
+    
+count_lines1(File) ->
+    Counter = fun Cnt(Dev,LC) ->
+                      case file:read_line(Dev) of
+                          eof -> LC;
+                          _   -> Cnt(Dev,LC+1)
+                      end
+              end,
+    {_,Dev} = file:open(File, [read]),
+    Lines = Counter(Dev, 0),
+    file:close(Dev),
+    Lines.
+
+start_tracer(Trace,Expected) ->
+    Pid = self(),
+    dbg:tracer(process,{fun tracer/2,{Pid,Expected}}),
+    dbg:p(whereis(?MODULE),[c]),
+    dbg:p(Pid,[c]),
+    tpl(Trace),
+    ok.
+
+tpl([{M,F,A}|Trace]) ->
+    {ok,Match} = dbg:tpl(M,F,A,[]),
+    case lists:keyfind(matched,1,Match) of
+        {_,_,1} ->
+            ok;
+        _ ->
+            dbg:stop_clear(),
+            throw({skip,"Can't trace "++atom_to_list(M)++":"++
+                       atom_to_list(F)++"/"++integer_to_list(A)})
+    end,
+    tpl(Trace);
+tpl([]) ->
+    ok.
+
+tracer({trace,_,call,{?MODULE,format,[#{msg:={string,Msg}}|_]}}, {Pid,[{formatter,Msg}|Expected]}) ->
+    maybe_tracer_done(Pid,Expected,{formatter,Msg});
+tracer({trace,_,call,{logger_disk_log_h,handle_cast,[{Op,_}|_]}}, {Pid,[{Mod,Func,Op}|Expected]}) ->
+    maybe_tracer_done(Pid,Expected,{Mod,Func,Op});
+tracer({trace,_,call,{Mod,Func,_}}, {Pid,[{Mod,Func}|Expected]}) ->
+    maybe_tracer_done(Pid,Expected,{Mod,Func});
+tracer({trace,_,call,Call}, {Pid,Expected}) ->
+    Pid ! {tracer_got_unexpected,Call,Expected},
+    {Pid,Expected}.
+
+maybe_tracer_done(Pid,[],Got) ->
+    ct:log("Tracer got: ~p~n",[Got]),
+    Pid ! tracer_done;
+maybe_tracer_done(Pid,Expected,Got) ->
+    ct:log("Tracer got: ~p~n",[Got]),
+    {Pid,Expected}.
+
+check_tracer(T) ->
+    receive
+        tracer_done ->
+            dbg:stop_clear(),
+            ok;
+        {tracer_got_unexpected,Got,Expected} ->
+            dbg:stop_clear(),
+            ct:fail({tracer_got_unexpected,Got,Expected})
+    after T ->
+            ct:fail({timeout,tracer})
+    end.
diff --git a/lib/kernel/test/logger_env_var_SUITE.erl b/lib/kernel/test/logger_env_var_SUITE.erl
new file mode 100644
index 0000000000..c2d3364701
--- /dev/null
+++ b/lib/kernel/test/logger_env_var_SUITE.erl
@@ -0,0 +1,451 @@
+%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_env_var_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+
+-define(all_vars,[{kernel,logger_dest},
+                  {kernel,logger_level},
+                  {kernel,logger_log_progress},
+                  {kernel,logger_sasl_compatible},
+                  {kernel,error_logger}]).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    Env = [{App,Key,application:get_env(App,Key)} || {App,Key} <- ?all_vars],
+    Removed = cleanup(),
+    [{env,Env},{logger,Removed}|Config].
+
+end_per_suite(Config) ->
+    [application:set_env(App,Key,Val) ||
+        {App,Key,Val} <- ?config(env,Config),
+        Val =/= undefined],
+    Hs = ?config(logger,Config),
+    [ok = logger:add_handler(Id,Mod,C) || {Id,Mod,C} <- Hs],
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    cleanup(),
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [default,
+     default_sasl_compatible,
+     dest_tty,
+     dest_tty_sasl_compatible,
+     dest_false,
+     dest_false_progress,
+     dest_false_sasl_compatible,
+     dest_silent,
+     dest_silent_sasl_compatible,
+     dest_file_old,
+     dest_file,
+     dest_disk_log,
+     %% disk_log_vars, % or test this in logger_disk_log_SUITE?
+     sasl_compatible_false,
+     sasl_compatible_false_no_progress,
+     sasl_compatible,
+     bad_dest%% ,
+     %% bad_level,
+     %% bad_sasl_compatibility,
+     %% bad_progress
+    ].
+
+default(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              undefined,
+                              undefined, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    {logger_std_h,logger_std_h,StdC} = lists:keyfind(logger_std_h,1,Hs),
+    true = is_pid(whereis(logger_std_h)),
+    info = maps:get(level,StdC),
+    StdFilters = maps:get(filters,StdC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp,sasl]}}} =
+        lists:keyfind(domain,1,StdFilters),
+    true = lists:keymember(stop_progress,1,StdFilters),
+    false = lists:keymember(logger_simple,1,Hs),
+    false = lists:keymember(sasl_h,1,Hs),
+    false = is_pid(whereis(sasl_h)),
+    ok.
+
+default_sasl_compatible(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              undefined,
+                              undefined, % dest
+                              undefined, % level
+                              true, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    {logger_std_h,logger_std_h,StdC} = lists:keyfind(logger_std_h,1,Hs),
+    true = is_pid(whereis(logger_std_h)),
+    info = maps:get(level,StdC),
+    StdFilters = maps:get(filters,StdC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp]}}} =
+        lists:keyfind(domain,1,StdFilters),
+    false = lists:keymember(stop_progress,1,StdFilters),
+    false = lists:keymember(logger_simple,1,Hs),
+    true = lists:keymember(sasl_h,1,Hs),
+    true = is_pid(whereis(sasl_h)),
+    ok.
+
+dest_tty(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              tty, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    {logger_std_h,logger_std_h,StdC} = lists:keyfind(logger_std_h,1,Hs),
+    true = is_pid(whereis(logger_std_h)),
+    info = maps:get(level,StdC),
+    StdFilters = maps:get(filters,StdC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp,sasl]}}} =
+        lists:keyfind(domain,1,StdFilters),
+    true = lists:keymember(stop_progress,1,StdFilters),
+    false = lists:keymember(logger_simple,1,Hs),
+    false = lists:keymember(sasl_h,1,Hs),
+    false = is_pid(whereis(sasl_h)),
+    ok.
+
+dest_tty_sasl_compatible(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              tty, % dest
+                              undefined, % level
+                              true, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    {logger_std_h,logger_std_h,StdC} = lists:keyfind(logger_std_h,1,Hs),
+    true = is_pid(whereis(logger_std_h)),
+    info = maps:get(level,StdC),
+    StdFilters = maps:get(filters,StdC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp]}}} =
+        lists:keyfind(domain,1,StdFilters),
+    false = lists:keymember(stop_progress,1,StdFilters),
+    false = lists:keymember(logger_simple,1,Hs),
+    true = lists:keymember(sasl_h,1,Hs),
+    true = is_pid(whereis(sasl_h)),
+    ok.
+
+dest_false(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              false, % dest
+                              notice, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    false = lists:keymember(logger_std_h,1,Hs),
+    {logger_simple,logger_simple,SimpleC} = lists:keyfind(logger_simple,1,Hs),
+    notice = maps:get(level,SimpleC),
+    SimpleFilters = maps:get(filters,SimpleC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp,sasl]}}} =
+        lists:keyfind(domain,1,SimpleFilters),
+    true = lists:keymember(stop_progress,1,SimpleFilters),
+    false = lists:keymember(sasl_h,1,Hs),
+    ok.
+
+dest_false_progress(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              false, % dest
+                              notice, % level
+                              undefined, % sasl comp (default=false)
+                              true), % progress (default=false)
+    false = lists:keymember(logger_std_h,1,Hs),
+    {logger_simple,logger_simple,SimpleC} = lists:keyfind(logger_simple,1,Hs),
+    notice = maps:get(level,SimpleC),
+    SimpleFilters = maps:get(filters,SimpleC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp,sasl]}}} =
+        lists:keyfind(domain,1,SimpleFilters),
+    false = lists:keymember(stop_progress,1,SimpleFilters),
+    false = lists:keymember(sasl_h,1,Hs),
+    ok.
+
+dest_false_sasl_compatible(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              false, % dest
+                              notice, % level
+                              true, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    false = lists:keymember(logger_std_h,1,Hs),
+    {logger_simple,logger_simple,SimpleC} = lists:keyfind(logger_simple,1,Hs),
+    notice = maps:get(level,SimpleC),
+    SimpleFilters = maps:get(filters,SimpleC),
+    {domain,{_,{log,prefix_of,[beam,erlang,otp]}}} =
+        lists:keyfind(domain,1,SimpleFilters),
+    false = lists:keymember(stop_progress,1,SimpleFilters),
+    true = lists:keymember(sasl_h,1,Hs),
+    true = is_pid(whereis(sasl_h)),
+    ok.
+
+dest_silent(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              silent, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    false = lists:keymember(logger_std_h,1,Hs),
+    false = lists:keymember(logger_simple,1,Hs),
+    false = lists:keymember(sasl_h,1,Hs),
+    ok.
+
+dest_silent_sasl_compatible(Config) ->
+    {ok,{_Log,Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              silent, % dest
+                              undefined, % level
+                              true, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    false = lists:keymember(logger_std_h,1,Hs),
+    false = lists:keymember(logger_simple,1,Hs),
+    true = lists:keymember(sasl_h,1,Hs),
+    true = is_pid(whereis(sasl_h)),
+    ok.
+
+
+dest_file_old(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              error_logger,
+                              file, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    check_log(Log,
+              file, % dest
+              0), % progress in std logger
+    ok.
+    
+
+dest_file(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              file, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    check_log(Log,
+              file, % dest
+              0), % progress in std logger
+    ok.
+    
+
+dest_disk_log(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              disk_log, % dest
+                              undefined, % level
+                              undefined, % sasl comp (default=false)
+                              undefined), % progress (default=false)
+    check_log(Log,
+              disk_log, % dest
+              0), % progress in std logger
+    ok.
+    
+
+sasl_compatible_false(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              file, % dest
+                              undefined, % level
+                              false, % sasl comp
+                              true), % progress
+    check_log(Log,
+              file, % dest
+              4), % progress in std logger
+    ok.
+
+sasl_compatible_false_no_progress(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              file, % dest
+                              undefined, % level
+                              false, % sasl comp
+                              false), % progress
+    check_log(Log,
+              file, % dest
+              0), % progress in std logger
+    ok.
+
+sasl_compatible(Config) ->
+    {ok,{Log,_Hs}} = setup(Config,?FUNCTION_NAME,
+                              logger_dest,
+                              file, % dest
+                              undefined, % level
+                              true, % sasl comp
+                              undefined), % progress
+    check_log(Log,
+              file, % dest
+              0), % progress in std logger
+    ok.
+
+bad_dest(Config) ->
+    {error,{bad_config,{kernel,{logger_dest,baddest}}}} =
+        setup(Config,?FUNCTION_NAME,
+              logger_dest,
+              baddest,
+              undefined,
+              undefined,
+              undefined).
+
+bad_level(Config) ->
+    error =
+        setup(Config,?FUNCTION_NAME,
+              logger_dest,
+              tty,
+              badlevel,
+              undefined,
+              undefined).
+
+bad_sasl_compatibility(Config) ->
+    error =
+        setup(Config,?FUNCTION_NAME,
+              logger_dest,
+              tty,
+              info,
+              badcomp,
+              undefined).
+
+bad_progress(Config) ->
+    error =
+        setup(Config,?FUNCTION_NAME,
+              logger_dest,
+              tty,
+              info,
+              undefined,
+              badprogress).
+
+%%%-----------------------------------------------------------------
+%%% Internal
+setup(Config,Func,DestVar,Dest,Level,SaslComp,Progress) ->
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log,
+                              logger_simple=>#{buffer=>true}}),
+    Dir = ?config(priv_dir,Config),
+    File = lists:concat([?MODULE,"_",Func,".log"]),
+    Log = filename:join(Dir,File),
+    case Dest of
+        undefined ->
+            ok;
+        F when F==file; F==disk_log ->
+            application:set_env(kernel,DestVar,{Dest,Log});
+        _ ->
+            application:set_env(kernel,DestVar,Dest)
+    end,
+    case Level of
+        undefined ->
+            ok;
+        _ ->
+           application:set_env(kernel,logger_level,Level)
+    end,
+    case SaslComp of
+        undefined ->
+            ok;
+        _ ->
+            application:set_env(kernel,logger_sasl_compatible,SaslComp)
+    end,
+    case Progress of
+        undefined ->
+            ok;
+        _ ->
+            application:set_env(kernel,logger_log_progress,Progress)
+    end,
+    case logger:setup_standard_handler() of
+        ok ->
+            application:start(sasl),
+            StdH = case Dest of
+                       NoH when NoH==false; NoH==silent -> false;
+                       _ -> true
+                   end,
+            StdH = is_pid(whereis(?STANDARD_HANDLER)),
+            SaslH = if SaslComp -> true;
+                       true -> false
+                    end,
+            SaslH = is_pid(whereis(sasl_h)),
+            {ok,{Log,maps:get(handlers,logger:i())}};
+        Error ->
+            Error
+    end.
+
+check_log(Log,Dest,NumProgress) ->
+    ok = logger:alert("dummy1"),
+    ok = logger:debug("dummy1"),
+
+    %% Check that there are progress reports (supervisor and
+    %% application_controller) and an error report (the call above) in
+    %% the log. There should not be any info reports yet.
+    {ok,Bin1} = sync_and_read(Dest,Log),
+    ct:log("Log content:~n~s",[Bin1]),
+    match(Bin1,<<"PROGRESS REPORT">>,NumProgress),
+    match(Bin1,<<"ALERT REPORT">>,1),
+    match(Bin1,<<"INFO REPORT">>,0),
+    match(Bin1,<<"DEBUG REPORT">>,0),
+
+    %% Then stop sasl and see that the info report from
+    %% application_controller is there
+    ok = application:stop(sasl),
+    {ok,Bin2} = sync_and_read(Dest,Log),
+    ct:log("Log content:~n~s",[Bin2]),
+    match(Bin2,<<"INFO REPORT">>,1),
+    match(Bin1,<<"DEBUG REPORT">>,0),
+    ok.
+
+match(Bin,Pattern,0) ->
+    nomatch = re:run(Bin,Pattern,[{capture,none}]);
+match(Bin,Pattern,N) ->
+    {match,M} = re:run(Bin,Pattern,[{capture,all},global]),
+    N = length(M).
+
+sync_and_read(disk_log,Log) ->
+    logger_disk_log_h:disk_log_sync(?STANDARD_HANDLER),
+    file:read_file(Log ++ ".1");
+sync_and_read(file,Log) ->
+    logger_std_h:filesync(?STANDARD_HANDLER),
+    file:read_file(Log).
+
+cleanup() ->
+    application:stop(sasl),
+    [application:unset_env(App,Key) || {App,Key} <- ?all_vars],
+    #{handlers:=Hs0} = logger:i(),
+    Hs = lists:keydelete(cth_log_redirect,1,Hs0),
+    [ok = logger:remove_handler(Id) || {Id,_,_} <- Hs],
+    Hs.
diff --git a/lib/kernel/test/logger_filters_SUITE.erl b/lib/kernel/test/logger_filters_SUITE.erl
new file mode 100644
index 0000000000..21f14bbc02
--- /dev/null
+++ b/lib/kernel/test/logger_filters_SUITE.erl
@@ -0,0 +1,214 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_filters_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+
+-define(ndlog,
+        #{level=>info,msg=>{"Line: ~p",[?LINE]},meta=>#{}}).
+-define(dlog(Domain),
+        #{level=>info,msg=>{"Line: ~p",[?LINE]},meta=>#{domain=>Domain}}).
+-define(llog(Level),
+        #{level=>Level,msg=>{"Line: ~p",[?LINE]},meta=>#{}}).
+-define(plog,
+        #{level=>info,
+          msg=>{report,#{label=>{?MODULE,progress}}},
+          meta=>#{line=>?LINE}}).
+-define(rlog(Node),
+        #{level=>info,
+          msg=>{"Line: ~p",[?LINE]},
+          meta=>#{gl=>rpc:call(Node,erlang,whereis,[user])}}).
+
+-define(TRY(X), my_try(fun() -> X end)).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [domain,
+     level,
+     progress,
+     remote_gl].
+
+domain(_Config) ->
+    L1 = logger_filters:domain(L1=?dlog([]),{log,prefix_of,[]}),
+    stop = logger_filters:domain(?dlog([]),{stop,prefix_of,[]}),
+    L2 = logger_filters:domain(L2=?dlog([]),{log,starts_with,[]}),
+    stop = logger_filters:domain(?dlog([]),{stop,starts_with,[]}),
+    L3 = logger_filters:domain(L3=?dlog([]),{log,equals,[]}),
+    stop = logger_filters:domain(?dlog([]),{stop,equals,[]}),
+    ignore = logger_filters:domain(?dlog([]),{log,no_domain,[]}),
+    ignore = logger_filters:domain(?dlog([]),{stop,no_domain,[]}),
+
+    L4 = logger_filters:domain(L4=?dlog([a]),{log,prefix_of,[a,b]}),
+    stop = logger_filters:domain(?dlog([a]),{stop,prefix_of,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{log,starts_with,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{stop,starts_with,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{log,equals,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{stop,equals,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{log,no_domain,[a,b]}),
+    ignore = logger_filters:domain(?dlog([a]),{stop,no_domain,[a,b]}),
+
+    ignore = logger_filters:domain(?dlog([a,b]),{log,prefix_of,[a]}),
+    ignore = logger_filters:domain(?dlog([a,b]),{stop,prefix_of,[a]}),
+    L5 = logger_filters:domain(L5=?dlog([a,b]),{log,starts_with,[a]}),
+    stop = logger_filters:domain(?dlog([a,b]),{stop,starts_with,[a]}),
+    ignore = logger_filters:domain(?dlog([a,b]),{log,equals,[a]}),
+    ignore = logger_filters:domain(?dlog([a,b]),{stop,equals,[a]}),
+    ignore = logger_filters:domain(?dlog([a,b]),{log,no_domain,[a]}),
+    ignore = logger_filters:domain(?dlog([a,b]),{stop,no_domain,[a]}),
+
+    ignore = logger_filters:domain(?ndlog,{log,prefix_of,[a]}),
+    ignore = logger_filters:domain(?ndlog,{stop,prefix_of,[a]}),
+    ignore = logger_filters:domain(?ndlog,{log,starts_with,[a]}),
+    ignore = logger_filters:domain(?ndlog,{stop,starts_with,[a]}),
+    ignore = logger_filters:domain(?ndlog,{log,equals,[a]}),
+    ignore = logger_filters:domain(?ndlog,{stop,equals,[a]}),
+    L6 = logger_filters:domain(L6=?ndlog,{log,no_domain,[a]}),
+    stop = logger_filters:domain(?ndlog,{stop,no_domain,[a]}),
+
+    L7 = logger_filters:domain(L7=?dlog([a,b,c,d]),{log,prefix_of,[a,b,c,d]}),
+    stop = logger_filters:domain(?dlog([a,b,c,d]),{stop,prefix_of,[a,b,c,d]}),
+    L8 = logger_filters:domain(L8=?dlog([a,b,c,d]),{log,starts_with,[a,b,c,d]}),
+    stop = logger_filters:domain(?dlog([a,b,c,d]),{stop,starts_with,[a,b,c,d]}),
+    L9 = logger_filters:domain(L9=?dlog([a,b,c,d]),{log,equals,[a,b,c,d]}),
+    stop = logger_filters:domain(?dlog([a,b,c,d]),{stop,equals,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog([a,b,c,d]),{log,no_domain,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog([a,b,c,d]),{stop,no_domain,[a,b,c,d]}),
+
+    %% A domain field in meta which is not a list is allowed by the
+    %% filter, but it will never match.
+    ignore = logger_filters:domain(?dlog(dummy),{log,prefix_of,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{stop,prefix_of,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{log,starts_with,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{stop,starts_with,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{log,equals,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{stop,equals,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{log,no_domain,[a,b,c,d]}),
+    ignore = logger_filters:domain(?dlog(dummy),{stop,no_domain,[a,b,c,d]}),
+
+    {error,badarg} = ?TRY(logger_filters:domain(?ndlog,bad)),
+    {error,badarg} = ?TRY(logger_filters:domain(?ndlog,{bad,prefix_of,[]})),
+    {error,badarg} = ?TRY(logger_filters:domain(?ndlog,{log,bad,[]})),
+    {error,badarg} = ?TRY(logger_filters:domain(?ndlog,{log,prefix_of,bad})),
+
+    ok.
+
+level(_Config) ->
+    ignore = logger_filters:level(?llog(info),{log,lt,info}),
+    ignore = logger_filters:level(?llog(info),{stop,lt,info}),
+    ignore = logger_filters:level(?llog(info),{log,gt,info}),
+    ignore = logger_filters:level(?llog(info),{stop,gt,info}),
+    L1 = logger_filters:level(L1=?llog(info),{log,lteq,info}),
+    stop = logger_filters:level(?llog(info),{stop,lteq,info}),
+    L2 = logger_filters:level(L2=?llog(info),{log,gteq,info}),
+    stop = logger_filters:level(?llog(info),{stop,gteq,info}),
+    L3 = logger_filters:level(L3=?llog(info),{log,eq,info}),
+    stop = logger_filters:level(?llog(info),{stop,eq,info}),
+    ignore = logger_filters:level(?llog(info),{log,neq,info}),
+    ignore = logger_filters:level(?llog(info),{stop,neq,info}),
+
+    ignore = logger_filters:level(?llog(error),{log,lt,info}),
+    ignore = logger_filters:level(?llog(error),{stop,lt,info}),
+    L4 = logger_filters:level(L4=?llog(error),{log,gt,info}),
+    stop = logger_filters:level(?llog(error),{stop,gt,info}),
+    ignore = logger_filters:level(?llog(error),{log,lteq,info}),
+    ignore = logger_filters:level(?llog(error),{stop,lteq,info}),
+    L5 = logger_filters:level(L5=?llog(error),{log,gteq,info}),
+    stop = logger_filters:level(?llog(error),{stop,gteq,info}),
+    ignore = logger_filters:level(?llog(error),{log,eq,info}),
+    ignore = logger_filters:level(?llog(error),{stop,eq,info}),
+    L6 = logger_filters:level(L6=?llog(error),{log,neq,info}),
+    stop = logger_filters:level(?llog(error),{stop,neq,info}),
+
+    L7 = logger_filters:level(L7=?llog(info),{log,lt,error}),
+    stop = logger_filters:level(?llog(info),{stop,lt,error}),
+    ignore = logger_filters:level(?llog(info),{log,gt,error}),
+    ignore = logger_filters:level(?llog(info),{stop,gt,error}),
+    L8 = logger_filters:level(L8=?llog(info),{log,lteq,error}),
+    stop = logger_filters:level(?llog(info),{stop,lteq,error}),
+    ignore = logger_filters:level(?llog(info),{log,gteq,error}),
+    ignore = logger_filters:level(?llog(info),{stop,gteq,error}),
+    ignore = logger_filters:level(?llog(info),{log,eq,error}),
+    ignore = logger_filters:level(?llog(info),{stop,eq,error}),
+    L9 = logger_filters:level(L9=?llog(info),{log,neq,error}),
+    stop = logger_filters:level(?llog(info),{stop,neq,error}),
+
+    {error,badarg} = ?TRY(logger_filters:level(?llog(info),bad)),
+    {error,badarg} = ?TRY(logger_filters:level(?llog(info),{bad,eq,info})),
+    {error,badarg} = ?TRY(logger_filters:level(?llog(info),{log,bad,info})),
+    {error,badarg} = ?TRY(logger_filters:level(?llog(info),{log,eq,bad})),
+
+    ok.
+
+progress(_Config) ->
+    L1 = logger_filters:progress(L1=?plog,log),
+    stop = logger_filters:progress(?plog,stop),
+    ignore = logger_filters:progress(?ndlog,log),
+    ignore = logger_filters:progress(?ndlog,stop),
+    
+    {error,badarg} = ?TRY(logger_filters:progress(?plog,bad)),
+    
+    ok.
+
+remote_gl(_Config) ->
+    {ok,Node} = test_server:start_node(?FUNCTION_NAME,slave,[]),
+    L1 = logger_filters:remote_gl(L1=?rlog(Node),log),
+    stop = logger_filters:remote_gl(?rlog(Node),stop),
+    ignore = logger_filters:remote_gl(?ndlog,log),
+    ignore = logger_filters:remote_gl(?ndlog,stop),
+
+    {error,badarg} = ?TRY(logger_filters:remote_gl(?rlog(Node),bad)),
+    ok.
+
+remote_gl(cleanup,_Config) ->
+    [test_server:stop_node(N) || N<-nodes()].
+
+%%%-----------------------------------------------------------------
+%%% Called by macro ?TRY(X)
+my_try(Fun) ->
+    try Fun() catch C:R -> {C,R} end.
diff --git a/lib/kernel/test/logger_formatter_SUITE.erl b/lib/kernel/test/logger_formatter_SUITE.erl
new file mode 100644
index 0000000000..44e12d2d2a
--- /dev/null
+++ b/lib/kernel/test/logger_formatter_SUITE.erl
@@ -0,0 +1,501 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_formatter_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+
+-define(TRY(X), my_try(fun() -> X end)).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    Config.
+
+end_per_suite(_Config) ->
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [default,
+     legacy_header,
+     single_line,
+     template,
+     format_msg,
+     report_cb,
+     max_size,
+     depth,
+     format_mfa,
+     format_time,
+     level_or_msg_in_meta,
+     faulty_log,
+     faulty_config,
+     faulty_msg].
+
+default(_Config) ->
+    String1 = format(info,{"~p",[term]},#{},#{}),
+    ct:log(String1),
+    [_Date,_Time,"info:\nterm\n"] = string:lexemes(String1," "),
+
+    Time = timestamp(),
+    ExpectedTimestamp = default_time_format(Time),
+    String2 = format(info,{"~p",[term]},#{time=>Time},#{}),
+    ct:log(String2),
+    " info:\nterm\n" = string:prefix(String2,ExpectedTimestamp), 
+    ok.
+
+legacy_header(_Config) ->
+    Time = timestamp(),
+    String1 = format(info,{"~p",[term]},#{time=>Time},#{legacy_header=>true}),
+    ct:log(String1),
+    "=INFO REPORT==== "++Rest = String1,
+    [Timestamp,"\nterm\n"] = string:lexemes(Rest," ="),
+    [D,M,Y,H,Min,S,Micro] = string:lexemes(Timestamp,"-:."),
+    integer(D,31),
+    integer(Y,2018,infinity),
+    integer(H,23),
+    integer(Min,59),
+    integer(S,59),
+    integer(Micro,999999),
+    true = lists:member(M,["Jan","Feb","Mar","Apr","May","Jun",
+                           "Jul","Aug","Sep","Oct","Nov","Dec"]),
+
+    String2 = format(info,{"~p",[term]},#{time=>Time},#{legacy_header=>false}),
+    ct:log(String2),
+    ExpectedTimestamp = default_time_format(Time),
+    " info:\nterm\n" = string:prefix(String2,ExpectedTimestamp), 
+    
+    String3 = format(info,{"~p",[term]},#{time=>Time},#{legacy_header=>bad}),
+    ct:log(String3),
+    String3 = String2,
+
+    String4 = format(info,{"~p",[term]},#{time=>Time},
+                     #{legacy_header=>true,
+                       single_line=>true}), % <---ignored
+    ct:log(String4),
+    String4 = String1,
+
+    String5 = format(info,{"~p",[term]},#{}, % <--- no time
+                     #{legacy_header=>true}),
+    ct:log(String5),
+    "=INFO REPORT==== "++_ = String5,
+    ok.
+
+single_line(_Config) ->
+    Time = timestamp(),
+    ExpectedTimestamp = default_time_format(Time),
+    String1 = format(info,{"~p",[term]},#{time=>Time},#{single_line=>true}),
+    ct:log(String1),
+    " info: term\n" = string:prefix(String1,ExpectedTimestamp), 
+
+    String2 = format(info,{"~p",[term]},#{time=>Time},#{single_line=>false}),
+    ct:log(String2),
+    " info:\nterm\n" = string:prefix(String2,ExpectedTimestamp), 
+
+    String2 = format(info,{"~p",[term]},#{time=>Time},#{single_line=>bad}),
+    ok.
+
+template(_Config) ->
+    Time = timestamp(),
+
+    Template1 = [msg],
+    String1 = format(info,{"~p",[term]},#{time=>Time},#{template=>Template1}),
+    ct:log(String1),
+    "term" = String1,
+
+    Template2 = [msg,unknown],
+    String2 = format(info,{"~p",[term]},#{time=>Time},#{template=>Template2}),
+    ct:log(String2),
+    "term" = String2,
+
+    Template3 = ["string"],
+    String3 = format(info,{"~p",[term]},#{time=>Time},#{template=>Template3}),
+    ct:log(String3),
+    "string" = String3,
+
+    Template4 = ["string\nnewline"],
+    String4 = format(info,{"~p",[term]},#{time=>Time},#{template=>Template4,
+                                                      single_line=>true}),
+    ct:log(String4),
+    "string\nnewline" = String4,
+
+    Template5 = [],
+    String5 = format(info,{"~p",[term]},#{time=>Time},#{template=>Template5}),
+    ct:log(String5),
+    "" = String5,
+
+    Ref6 = erlang:make_ref(),
+    Meta6 = #{atom=>some_atom,
+              integer=>632,
+              list=>[list,"string",4321,#{},{tuple}],
+              mfa=>{mod,func,0},
+              pid=>self(),
+              ref=>Ref6,
+              string=>"some string",
+              time=>Time,
+              tuple=>{1,atom,"list"},
+              nested=>#{subkey=>subvalue}},
+    Template6 = lists:join(";",maps:keys(maps:remove(nested,Meta6)) ++
+                               [{nested,subkey}]),
+    String6 = format(info,{"~p",[term]},Meta6,#{template=>Template6,
+                                                single_line=>true}),
+    ct:log(String6),
+    SelfStr = pid_to_list(self()),
+    RefStr6 = ref_to_list(Ref6),
+    ListStr = "[list,\"string\",4321,#{},{tuple}]",
+    ExpectedTime6 = default_time_format(Time),
+    ["some_atom",
+     "632",
+     ListStr,
+     "mod:func/0",
+     SelfStr,
+     RefStr6,
+     "some string",
+     ExpectedTime6,
+     "{1,atom,\"list\"}",
+     "subvalue"] = string:lexemes(String6,";"),
+
+    Meta7 = #{time=>Time,
+              nested=>#{key1=>#{subkey1=>value1},
+                        key2=>value2}},
+    Template7 = lists:join(";",[nested,
+                                {nested,key1},
+                                {nested,key1,subkey1},
+                                {nested,key2},
+                                {nested,key2,subkey2},
+                                {nested,key3},
+                                {nested,key3,subkey3}]),
+    String7 = format(info,{"~p",[term]},Meta7,#{template=>Template7,
+                                                single_line=>true}),
+    ct:log(String7),
+    [MultipleKeysStr,
+     "#{subkey1 => value1}",
+     "value1",
+     "value2",
+     "",
+     "",
+     ""] = string:split(String7,";",all),
+    %% Order of keys is not fixed
+    case MultipleKeysStr of
+        "#{key2 => value2,key1 => #{subkey1 => value1}}" -> ok;
+        "#{key1 => #{subkey1 => value1},key2 => value2}" -> ok;
+        _ -> ct:fail({full_nested_map_unexpected,MultipleKeysStr})
+    end,
+    ok.
+
+format_msg(_Config) ->
+    Template = [msg],
+
+    String1 = format(info,{"~p",[term]},#{},#{template=>Template}),
+    ct:log(String1),
+    "term" = String1,
+
+    String2 = format(info,{"list",[term]},#{},#{template=>Template}),
+    ct:log(String2),
+    "FORMAT ERROR: \"list\" - [term]" = String2,
+    
+    String3 = format(info,{report,term},#{},#{template=>Template}),
+    ct:log(String3),
+    "term" = String3,
+
+    String4 = format(info,{report,term},
+                     #{report_cb=>fun(_)-> {"formatted",[]} end},
+                     #{template=>Template}),
+    ct:log(String4),
+    "formatted" = String4,
+
+    String5 = format(info,{report,term},
+                     #{report_cb=>fun(_)-> faulty_return end},
+                     #{template=>Template}),
+    ct:log(String5),
+    "REPORT_CB ERROR: term; Returned: faulty_return" = String5,
+
+    String6 = format(info,{report,term},
+                     #{report_cb=>fun(_)-> erlang:error(fun_crashed) end},
+                     #{template=>Template}),
+    ct:log(String6),
+    "REPORT_CB CRASH: term; Reason: {error,fun_crashed}" = String6,
+
+    %% strings are not formatted
+    String7 = format(info,{string,"string"},
+                     #{report_cb=>fun(_)-> {"formatted",[]} end},
+                     #{template=>Template}),
+    ct:log(String7),
+    "string" = String7,
+
+    String8 = format(info,{string,['not',printable,list]},
+                     #{report_cb=>fun(_)-> {"formatted",[]} end},
+                     #{template=>Template}),
+    ct:log(String8),
+    "INVALID STRING: ['not',printable,list]" = String8,
+
+    String9 = format(info,{string,"string"},#{},#{template=>Template}),
+    ct:log(String9),
+    "string" = String9,
+
+    ok.
+
+report_cb(_Config) ->
+    Template = [msg],
+    MetaFun = fun(_) -> {"meta_rcb",[]} end,
+    ConfigFun = fun(_) -> {"config_rcb",[]} end,
+    "term" = format(info,{report,term},#{},#{template=>Template}),
+    "meta_rcb" =
+        format(info,{report,term},#{report_cb=>MetaFun},#{template=>Template}),
+    "config_rcb" =
+        format(info,{report,term},#{},#{template=>Template,
+                                        report_cb=>ConfigFun}),
+    "config_rcb" =
+        format(info,{report,term},#{report_cb=>MetaFun},#{template=>Template,
+                                                          report_cb=>ConfigFun}),
+    ok.
+
+max_size(_Config) ->
+    Template = [msg],
+    "12345678901234567890" =
+        format(info,{"12345678901234567890",[]},#{},#{template=>Template}),
+    application:set_env(kernel,logger_max_size,11),
+    "12345678901234567890" = % min value is 50, so this is not limited
+        format(info,{"12345678901234567890",[]},#{},#{template=>Template}),
+    "12345678901234567890123456789012345678901234567..." = % 50
+        format(info,
+               {"123456789012345678901234567890123456789012345678901234567890",
+                []},
+               #{},
+               #{template=>Template}),
+    application:set_env(kernel,logger_max_size,53),
+    "12345678901234567890123456789012345678901234567890..." = %53
+        format(info,
+               {"123456789012345678901234567890123456789012345678901234567890",
+                []},
+               #{},
+               #{template=>Template}),
+    "1234567..." =
+        format(info,{"12345678901234567890",[]},#{},#{template=>Template,
+                                                      max_size=>10}),
+    "12345678901234567890" =
+        format(info,{"12345678901234567890",[]},#{},#{template=>Template,
+                                                      max_size=>unlimited}),
+    ok.
+max_size(cleanup,_Config) ->
+    application:unset_env(kernel,logger_max_size),
+    ok.
+
+depth(_Config) ->
+    Template = [msg],
+    "[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]" =
+        format(info,
+               {"~p",[[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]]},
+               #{},
+               #{template=>Template}),
+    application:set_env(kernel,error_logger_format_depth,11),
+    "[1,2,3,4,5,6,7,8,9,0|...]" =
+        format(info,
+               {"~p",[[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]]},
+               #{},
+               #{template=>Template}),
+    application:set_env(kernel,logger_format_depth,12),
+    "[1,2,3,4,5,6,7,8,9,0,1|...]" =
+        format(info,
+               {"~p",[[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]]},
+               #{},
+               #{template=>Template}),
+    "[1,2,3,4,5,6,7,8,9,0,1,2|...]" =
+        format(info,
+               {"~p",[[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]]},
+               #{},
+               #{template=>Template,
+                 depth=>13}),
+    "[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]" =
+        format(info,
+               {"~p",[[1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]]},
+               #{},
+               #{template=>Template,
+                 depth=>unlimited}),
+    ok.
+depth(cleanup,_Config) ->
+    application:unset_env(kernel,logger_format_depth),
+    ok.
+
+format_mfa(_Config) ->
+    Template = [mfa],
+
+    Meta1 = #{mfa=>{mod,func,0}},
+    String1 = format(info,{"~p",[term]},Meta1,#{template=>Template}),
+    ct:log(String1),
+    "mod:func/0" = String1,
+
+    Meta2 = #{mfa=>{mod,func,[]}},
+    String2 = format(info,{"~p",[term]},Meta2,#{template=>Template}),
+    ct:log(String2),
+    "mod:func/0" = String2,
+
+    Meta3 = #{mfa=>"mod:func/0"},
+    String3 = format(info,{"~p",[term]},Meta3,#{template=>Template}),
+    ct:log(String3),
+    "mod:func/0" = String3,
+
+    Meta4 = #{mfa=>othermfa},
+    String4 = format(info,{"~p",[term]},Meta4,#{template=>Template}),
+    ct:log(String4),
+    "othermfa" = String4,
+
+    ok.
+    
+format_time(_Config) ->
+    Time1 = timestamp(),
+    ExpectedTimestamp1 = default_time_format(Time1),
+    String1 = format(info,{"~p",[term]},#{time=>Time1},#{}),
+    ct:log(String1),
+    " info:\nterm\n" = string:prefix(String1,ExpectedTimestamp1),
+
+    Time2 = timestamp(),
+    ExpectedTimestamp2 = default_time_format(Time2,true),
+    String2 = format(info,{"~p",[term]},#{time=>Time2},#{utc=>true}),
+    ct:log(String2),
+    " info:\nterm\n" = string:prefix(String2,ExpectedTimestamp2),
+
+    application:set_env(kernel,logger_utc,true),
+    Time3 = timestamp(),
+    ExpectedTimestamp3 = default_time_format(Time3,true),
+    String3 = format(info,{"~p",[term]},#{time=>Time3},#{}),
+    ct:log(String3),
+    " info:\nterm\n" = string:prefix(String3,ExpectedTimestamp3),
+
+    ok.
+
+format_time(cleanup,_Config) ->
+    application:unset_env(kernel,logger_utc),
+    ok.
+
+level_or_msg_in_meta(_Config) ->
+    %% The template contains atoms to pick out values from meta,
+    %% or level/msg to add these from the log event. What if you have
+    %% a key named 'level' or 'msg' in meta and want to display
+    %% its value?
+    %% For now we simply ignore Meta on this and display the
+    %% actual level and msg from the log event.
+
+    Meta = #{level=>mylevel,
+                 msg=>"metamsg"},
+    Template = [level,";",msg],
+    String = format(info,{"~p",[term]},Meta,#{template=>Template}),
+    ct:log(String),
+    "info;term" = String, % so mylevel and "metamsg" are ignored
+    
+    ok.
+
+faulty_log(_Config) ->
+    %% Unexpected log (should be type logger:log()) - print error
+    {error,
+     function_clause,
+     {logger_formatter,format,[_,_],_}} =
+        ?TRY(logger_formatter:format(unexp_log,#{})),
+    ok.
+
+faulty_config(_Config) ->
+    {error,
+     function_clause,
+     {logger_formatter,format,[_,_],_}} =
+        ?TRY(logger_formatter:format(#{level=>info,
+                                       msg=>{"~p",[term]},
+                                       meta=>#{time=>timestamp()}},
+                                     unexp_config)),
+    ok.
+
+faulty_msg(_Config) ->
+    {error,
+     function_clause,
+     {logger_formatter,_,[_,_],_}} =
+        ?TRY(logger_formatter:format(#{level=>info,
+                                       msg=>term,
+                                       meta=>#{time=>timestamp()}},
+                                     #{})),
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+format(Level,Msg,Meta,Config) ->
+    format(#{level=>Level,msg=>Msg,meta=>add_time(Meta)},Config).
+
+format(Log,Config) ->
+    lists:flatten(logger_formatter:format(Log,Config)).
+
+default_time_format(Timestamp) ->
+    default_time_format(Timestamp,false).
+
+default_time_format(Timestamp0,Utc) when is_integer(Timestamp0) ->
+    Timestamp=Timestamp0+erlang:time_offset(microsecond),
+    %% calendar:system_time_to_rfc3339(Time,[{unit,microsecond}]).
+    Micro = Timestamp rem 1000000,
+    Sec = Timestamp div 1000000,
+    UniversalTime =  erlang:posixtime_to_universaltime(Sec),
+    {Date,Time} =
+        if Utc -> UniversalTime;
+           true -> erlang:universaltime_to_localtime(UniversalTime)
+        end,
+    default_time_format(Date,Time,Micro).
+
+default_time_format({Y,M,D},{H,Min,S},Micro) ->
+    lists:flatten(
+      io_lib:format("~4w-~2..0w-~2..0w ~2w:~2..0w:~2..0w.~6..0w",
+                    [Y,M,D,H,Min,S,Micro])).
+
+integer(Str) ->
+    is_integer(list_to_integer(Str)).
+integer(Str,Max) ->
+    integer(Str,0,Max).
+integer(Str,Min,Max) ->
+    Int = list_to_integer(Str),
+    Int >= Min andalso Int =<Max.
+
+%%%-----------------------------------------------------------------
+%%% Called by macro ?TRY(X)
+my_try(Fun) ->
+    try Fun() catch C:R:S -> {C,R,hd(S)} end.
+
+timestamp() ->
+    erlang:monotonic_time(microsecond).
+
+%% necessary?
+add_time(#{time:=_}=Meta) ->
+    Meta;
+add_time(Meta) ->
+    Meta#{time=>timestamp()}.
diff --git a/lib/kernel/test/logger_legacy_SUITE.erl b/lib/kernel/test/logger_legacy_SUITE.erl
new file mode 100644
index 0000000000..b59f5f7758
--- /dev/null
+++ b/lib/kernel/test/logger_legacy_SUITE.erl
@@ -0,0 +1,282 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_legacy_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+
+%%%-----------------------------------------------------------------
+%%% This test suite test that log events from within OTP can be
+%%% delivered to legacy error_logger event handlers on the same format
+%%% as before 'logger' was introduced.
+%%%
+%%% Before changing the expected format of any of the log events in
+%%% this suite, please make sure that the backwards incompatibility it
+%%% introduces is ok.
+%%% -----------------------------------------------------------------
+
+-define(check(Expected),
+        receive Expected ->
+                [] = test_server:messages_get()
+        after 1000 ->
+                ct:fail({report_not_received,
+                         {line,?LINE},
+                         {got,test_server:messages_get()}})
+        end).
+-define(check_no_flush(Expected),
+        receive Expected ->
+                ok
+        after 1000 ->
+                ct:fail({report_not_received,
+                         {line,?LINE},
+                         {got,test_server:messages_get()}})
+        end).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    logger:add_handler(error_logger,error_logger,
+                       #{level=>info,filter_default=>stop}),
+    Config.
+
+end_per_suite(_Config) ->
+    logger:remove_handler(error_logger),
+    ok.
+
+init_per_group(std, Config) ->
+    ok = logger:set_handler_config(
+           error_logger,filters,
+           [{domain,{fun logger_filters:domain/2,
+                     {log,prefix_of,[beam,erlang,otp]}}}]),
+    Config;
+init_per_group(sasl, Config) ->
+    ok = logger:set_handler_config(
+           error_logger,filters,
+           [{domain,{fun logger_filters:domain/2,
+                     {log,prefix_of,[beam,erlang,otp,sasl]}}}]),
+
+    %% cth_log_redirect checks if sasl is started before displaying
+    %% any sasl reports - so just to see the real sasl reports in tc
+    %% log:
+    application:start(sasl),
+    Config;
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(sasl, _Config) ->
+    application:stop(sasl),
+    ok;
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    error_logger:add_report_handler(?MODULE,{event_handler,self()}),
+    Config.
+
+end_per_testcase(Case, Config) ->
+    %% Using gen_event directly here, instead of
+    %% error_logger:delete_report_handler. This is to avoid
+    %% automatically stopping the error_logger process due to removing
+    %% the last handler.
+    gen_event:delete_handler(error_logger,?MODULE,[]),
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [{std,[],[gen_server,
+              gen_event,
+              gen_fsm,
+              gen_statem]},
+     {sasl,[],[sasl_reports,
+               supervisor_handle_info]}].
+
+all() ->
+    [{group,std},
+     {group,sasl}].
+
+gen_server(_Config) ->
+    {ok,Pid} = gen_server:start(?MODULE,gen_server,[]),
+    Msg = fun() -> a=b end,
+    Pid ! Msg,
+    ?check({warning_msg,"** Undefined handle_info in ~p"++_,[?MODULE,Msg]}),
+    ok = gen_server:cast(Pid,Msg),
+    ?check({error,"** Generic server ~tp terminating"++_,
+            [Pid,{'$gen_cast',Msg},gen_server,{{badmatch,b},_}]}).
+
+gen_event(_Config) ->
+    {ok,Pid} = gen_event:start(),
+    ok = gen_event:add_handler(Pid,?MODULE,gen_event),
+    Msg = fun() -> a=b end,
+    Pid ! Msg,
+    ?check({warning_msg,"** Undefined handle_info in ~tp"++_,[?MODULE,Msg]}),
+    gen_event:notify(Pid,Msg),
+    ?check({error,"** gen_event handler ~p crashed."++_,
+            [?MODULE,Pid,Msg,gen_event,{{badmatch,b},_}]}).
+
+gen_fsm(_Config) ->
+    {ok,Pid} = gen_fsm:start(?MODULE,gen_fsm,[]),
+    Msg = fun() -> a=b end,
+    Pid ! Msg,
+    ?check({warning_msg,"** Undefined handle_info in ~p"++_,[?MODULE,Msg]}),
+    gen_fsm:send_all_state_event(Pid,Msg),
+    ?check({error,"** State machine ~tp terminating"++_,
+            [Pid,Msg,mystate,gen_fsm,{{badmatch,b},_}]}).
+
+gen_statem(_Config) ->
+    {ok,Pid} = gen_statem:start(?MODULE,gen_statem,[]),
+    Msg = fun() -> a=b end,
+    Pid ! Msg,
+    ?check({error,"** State machine ~tp terminating"++_,
+            [Pid,{info,Msg},{mystate,gen_statem},error,{badmatch,b}|_]}).
+
+sasl_reports(Config) ->
+    App = {application,?MODULE,[{description, ""},
+                                {vsn, "1.0"},
+                                {modules, [?MODULE]},
+                                {registered, []},
+                                {applications, []},
+                                {mod, {?MODULE, []}}]},
+    AppStr = io_lib:format("~p.",[App]),
+    Dir = ?config(priv_dir,Config),
+    AppFile = filename:join(Dir,?MODULE_STRING++".app"),
+    ok = file:write_file(AppFile,AppStr),
+    true = code:add_patha(Dir),
+    ok = application:start(?MODULE),
+    SupName = sup_name(),
+    Pid = whereis(SupName),
+    [{ch,ChPid,_,_}] = supervisor:which_children(Pid),
+    Node = node(),
+    ?check_no_flush({info_report,progress,[{application,?MODULE},
+                                           {started_at,Node}]}),
+    ?check({info_report,progress,[{supervisor,{local,SupName}},
+                                  {started,[{pid,ChPid}|_]}]}),
+    ok = gen_server:cast(ChPid, fun() ->
+                                        spawn_link(fun() -> receive x->ok end end)
+                                end),
+    Msg = fun() -> a=b end,
+    ok = gen_server:cast(ChPid,Msg),
+    ?check_no_flush({error,"** Generic server ~tp terminating"++_,
+                     [ChPid,{'$gen_cast',Msg},gen_server,{{badmatch,b},_}]}),
+    ?check_no_flush({error_report,crash_report,
+                     [[{initial_call,_},
+                       {pid,ChPid},
+                       {registered_name,[]},
+                       {error_info,{error,{badmatch,b},_}},
+                       {ancestors,_},
+                       {message_queue_len,_},
+                       {messages,_},
+                       {links,[Pid,Neighbour]},
+                       {dictionary,_},
+                       {trap_exit,_},
+                       {status,_},
+                       {heap_size,_},
+                       {stack_size,_},
+                       {reductions,_}],
+                      [{neighbour,[{pid,Neighbour},
+                                   {registered_name,_},
+                                   {initial_call,_},
+                                   {current_function,_},
+                                   {ancestors,_},
+                                   {message_queue_len,_},
+                                   {links,[ChPid]},
+                                   {trap_exit,_},
+                                   {status,_},
+                                   {heap_size,_},
+                                   {stack_size,_},
+                                   {reductions,_},
+                                   {current_stacktrace,_}]}]]}),
+    ?check_no_flush({error_report,supervisor_report,
+                     [{supervisor,{local,SupName}},
+                      {errorContext,child_terminated},
+                      {reason,{{badmatch,b},_}},
+                      {offender,[{pid,ChPid}|_]}]}),
+    ?check({info_report,progress,[{supervisor,{local,SupName}},
+                                  {started,_}]}),
+
+    ok = application:stop(?MODULE),
+    ?check({info_report,std_info,[{application,?MODULE},
+                                  {exited,stopped},
+                                  {type,temporary}]}).
+
+sasl_reports(cleanup,_Config) ->
+    application:stop(?MODULE).
+
+supervisor_handle_info(_Config) ->
+    {ok,Pid} = supervisor:start_link({local,sup_name()},?MODULE,supervisor),
+    ?check({info_report,progress,[{supervisor,_},{started,_}]}),
+    Pid ! msg,
+    ?check({error,"Supervisor received unexpected message: ~tp~n",[msg]}).
+
+supervisor_handle_info(cleanup,_Config) ->
+    Pid = whereis(sup_name()),
+    unlink(Pid),
+    exit(Pid,shutdown).
+
+%%%-----------------------------------------------------------------
+%%% Callbacks for error_logger event handler, gen_server, gen_statem,
+%%% gen_fsm, gen_event, supervisor and application.
+start(_,_) ->
+    supervisor:start_link({local,sup_name()},?MODULE,supervisor).
+
+init(supervisor) ->
+    {ok,{#{},[#{id=>ch,start=>{gen_server,start_link,[?MODULE,gen_server,[]]}}]}};
+init(StateMachine) when StateMachine==gen_statem; StateMachine==gen_fsm ->
+    {ok,mystate,StateMachine};
+init(State) ->
+    {ok,State}.
+
+%% error_logger event handler
+handle_event({Tag,_Gl,{_Pid,Type,Report}},{_,Pid}=State) ->
+    Pid ! {Tag,Type,Report},
+    {ok,State};
+%% other gen_event
+handle_event(Fun,State) when is_function(Fun) ->
+    Fun(),
+    {next_state,State}.
+
+%% gen_fsm
+handle_event(Fun,State,Data) when is_function(Fun)  ->
+    Fun(),
+    {next_state,State,Data}.
+
+%% gen_statem
+handle_event(info,Fun,State,Data) when is_function(Fun)  ->
+    Fun(),
+    {next_state,State,Data}.
+
+%% gen_server
+handle_cast(Fun,State) when is_function(Fun)  ->
+    Fun(),
+    {noreply,State}.
+
+%% gen_statem
+callback_mode() ->
+    handle_event_function.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+sup_name() ->
+    list_to_atom(?MODULE_STRING++"_sup").
diff --git a/lib/kernel/test/logger_simple_SUITE.erl b/lib/kernel/test/logger_simple_SUITE.erl
new file mode 100644
index 0000000000..5d8d32492d
--- /dev/null
+++ b/lib/kernel/test/logger_simple_SUITE.erl
@@ -0,0 +1,247 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_simple_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+
+-define(check_no_log,[] = test_server:messages_get()).
+-define(check(Expected),
+        receive {log,Expected} ->
+                [] = test_server:messages_get()
+        after 1000 ->
+                ct:fail({report_not_received,
+                         {line,?LINE},
+                         {expected,Expected},
+                         {got,test_server:messages_get()}})
+        end).
+
+-define(str,"Log from "++atom_to_list(?FUNCTION_NAME)++
+            ":"++integer_to_list(?LINE)).
+-define(map_rep,#{function=>?FUNCTION_NAME, line=>?LINE}).
+-define(keyval_rep,[{function,?FUNCTION_NAME}, {line,?LINE}]).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    #{handlers:=Hs0} = logger:i(),
+    Hs = lists:keydelete(cth_log_redirect,1,Hs0),
+    [ok = logger:remove_handler(Id) || {Id,_,_} <- Hs],
+    Env = [{App,Key,application:get_env(App,Key)} ||
+              {App,Key} <- [{kernel,logger_dest},
+                            {kernel,logger_level}]],
+    [{env,Env},{logger,Hs}|Config].
+
+end_per_suite(Config) ->
+    [application:set_env(App,Key,Val) || {App,Key,Val} <- ?config(env,Config)],
+    Hs = ?config(logger,Config),
+    [ok = logger:add_handler(Id,Mod,C) || {Id,Mod,C} <- Hs],
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(_TestCase, Config) ->
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [start_stop,
+     get_buffer,
+     replace_file,
+     replace_disk_log
+    ].
+
+start_stop(_Config) ->
+    undefined = whereis(logger_simple),
+    register(logger_simple,self()),
+    {error,_} = logger:add_handler(logger_simple,
+                                   logger_simple,
+                                   #{filter_default=>log}),    
+    unregister(logger_simple),
+    ok = logger:add_handler(logger_simple,logger_simple,#{filter_default=>log}),
+    Pid = whereis(logger_simple),
+    true = is_pid(Pid),
+    ok = logger:remove_handler(logger_simple),
+    false = is_pid(whereis(logger_simple)),
+    ok.
+start_stop(cleanup,_Config) ->
+    logger:remove_handler(logger_simple).
+
+get_buffer(_Config) ->
+    %% Start simple without buffer
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log}), 
+    logger:emergency(?str),
+    logger:alert(?str,[]),
+    logger:error(?map_rep),
+    logger:info(?keyval_rep),
+    {ok,[]} = logger_simple:get_buffer(), % no buffer
+    ok = logger:remove_handler(logger_simple),
+
+    %% Start with buffer
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log,
+                              logger_simple=>#{buffer=>true}}),
+    logger:emergency(M1=?str),
+    logger:alert(M2=?str,[]),
+    logger:error(M3=?map_rep),
+    logger:info(M4=?keyval_rep),
+    logger:info(M41=?keyval_rep++[not_key_val]),
+    error_logger:error_report(some_type,M5=?map_rep),
+    error_logger:warning_report("some_type",M6=?map_rep),
+    logger:critical(M7=?str,[A7=?keyval_rep]),
+    logger:notice(M8=["fake",string,"line:",?LINE]),
+    {ok,Buffered1} = logger_simple:get_buffer(),
+    [#{level:=emergency,msg:={string,M1}},
+     #{level:=alert,msg:={M2,[]}},
+     #{level:=error,msg:={report,M3}},
+     #{level:=info,msg:={report,M4}},
+     #{level:=info,msg:={report,M41}},
+     #{level:=error,msg:={report,#{label:={error_logger,error_report},
+                                   report:=M5}}},
+     #{level:=warning,msg:={report,#{label:={error_logger,warning_report},
+                                   report:=M6}}},
+     #{level:=critical,msg:={M7,[A7]}},
+     #{level:=notice,msg:={string,M8}}] = Buffered1,
+
+    %% Keep logging - should not buffer any more
+    logger:emergency(?str),
+    logger:alert(?str,[]),
+    logger:error(?map_rep),
+    logger:info(?keyval_rep),
+    {ok,[]} = logger_simple:get_buffer(),
+    ok = logger:remove_handler(logger_simple),
+
+    %% Fill buffer and drop
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log,
+                              logger_simple=>#{buffer=>true}}),
+    logger:emergency(M9=?str),
+    M10=?str,
+    [logger:info(M10) || _ <- lists:seq(1,8)],
+    logger:error(M11=?str),
+    logger:error(?str),
+    logger:error(?str),
+    {ok,Buffered3} = logger_simple:get_buffer(),
+    11 = length(Buffered3),
+    [#{level:=emergency,msg:={string,M9}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=info,msg:={string,M10}},
+     #{level:=error,msg:={string,M11}},
+     #{level:=info,msg:={"Simple handler buffer full, dropped ~w messages",[2]}}]
+        = Buffered3,
+    ok.
+get_buffer(cleanup,_Config) ->
+    logger:remove_handler(logger_simple).
+
+replace_file(Config) ->
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log,
+                              logger_simple=>#{buffer=>true}}),
+    logger:emergency(M1=?str),
+    logger:alert(M2=?str,[]),
+    logger:error(?map_rep),
+    logger:info(?keyval_rep),
+    undefined = whereis(?STANDARD_HANDLER),
+    PrivDir = ?config(priv_dir,Config),
+    File = filename:join(PrivDir,atom_to_list(?FUNCTION_NAME)++".log"),
+
+    application:set_env(kernel,logger_dest,{file,File}),
+    application:set_env(kernel,logger_level,info),
+
+    ok = logger:setup_standard_handler(),
+    true = is_pid(whereis(?STANDARD_HANDLER)),
+    ok = logger_std_h:filesync(?STANDARD_HANDLER),
+    {ok,Bin} = file:read_file(File),
+    Lines = [unicode:characters_to_list(L) || 
+                L <- binary:split(Bin,<<"\n">>,[global,trim])],
+    ["=EMERGENCY REPORT===="++_,
+     M1,
+     "=ALERT REPORT===="++_,
+     M2,
+     "=ERROR REPORT===="++_,
+     _,
+     _,
+     "=INFO REPORT===="++_,
+     _,
+     _] = Lines,
+    ok.
+replace_file(cleanup,_Config) ->
+    logger:remove_handler(?STANDARD_HANDLER),
+    logger:remove_handler(logger_simple).
+    
+replace_disk_log(Config) ->
+    ok = logger:add_handler(logger_simple,logger_simple,
+                            #{filter_default=>log,
+                              logger_simple=>#{buffer=>true}}),
+    logger:emergency(M1=?str),
+    logger:alert(M2=?str,[]),
+    logger:error(?map_rep),
+    logger:info(?keyval_rep),
+    undefined = whereis(?STANDARD_HANDLER),
+    PrivDir = ?config(priv_dir,Config),
+    File = filename:join(PrivDir,atom_to_list(?FUNCTION_NAME)),
+
+    application:set_env(kernel,logger_dest,{disk_log,File}),
+    application:set_env(kernel,logger_level,info),
+
+    ok = logger:setup_standard_handler(),
+    true = is_pid(whereis(?STANDARD_HANDLER)),
+    ok = logger_disk_log_h:disk_log_sync(?STANDARD_HANDLER),
+    {ok,Bin} = file:read_file(File++".1"),
+    Lines = [unicode:characters_to_list(L) || 
+                L <- binary:split(Bin,<<"\n">>,[global,trim])],
+    ["=EMERGENCY REPORT===="++_,
+     M1,
+     "=ALERT REPORT===="++_,
+     M2,
+     "=ERROR REPORT===="++_,
+     _,
+     _,
+     "=INFO REPORT===="++_,
+     _,
+     _|_] = Lines, % the tail might be an info report about opening the disk log
+    ok.
+replace_disk_log(cleanup,_Config) ->
+    logger:remove_handler(?STANDARD_HANDLER),
+    logger:remove_handler(logger_simple).
+
diff --git a/lib/kernel/test/logger_std_h_SUITE.erl b/lib/kernel/test/logger_std_h_SUITE.erl
new file mode 100644
index 0000000000..e940e0a026
--- /dev/null
+++ b/lib/kernel/test/logger_std_h_SUITE.erl
@@ -0,0 +1,1396 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_std_h_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("kernel/include/logger.hrl").
+-include_lib("kernel/src/logger_internal.hrl").
+-include_lib("kernel/src/logger_h_common.hrl").
+-include_lib("stdlib/include/ms_transform.hrl").
+-include_lib("kernel/include/file.hrl").
+
+-define(check_no_log, [] = test_server:messages_get()).
+-define(check(Expected),
+        receive
+            {log,Expected} ->
+                [] = test_server:messages_get()
+        after 5000 ->
+                ct:fail({report_not_received,
+                         {line,?LINE},
+                         {expected,Expected},
+                         {got,test_server:messages_get()}})
+        end).
+
+-define(msg,"Log from "++atom_to_list(?FUNCTION_NAME)++
+            ":"++integer_to_list(?LINE)).
+-define(bin(Msg), list_to_binary(Msg++"\n")).
+-define(domain,#{domain=>[?MODULE]}).
+
+-define(FILESYNC_REP_INT, if is_atom(?FILESYNC_REPEAT_INTERVAL) -> 5500;
+                             true -> ?FILESYNC_REPEAT_INTERVAL + 500
+                          end).
+
+suite() ->
+    [{timetrap,{seconds,30}}].
+
+init_per_suite(Config) ->
+    timer:start(),                              % to avoid progress report
+    {ok,{?STANDARD_HANDLER,#{formatter:=OrigFormatter}}} =
+        logger:get_handler_config(?STANDARD_HANDLER),
+    [{formatter,OrigFormatter}|Config].
+
+end_per_suite(Config) ->
+    {OrigMod,OrigConf} = proplists:get_value(formatter,Config),
+    logger:set_handler_config(?STANDARD_HANDLER,formatter,{OrigMod,OrigConf}),
+    ok.
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_testcase(TestHooksCase, Config) when
+      TestHooksCase == write_failure;
+      TestHooksCase == sync_failure ->
+    if ?TEST_HOOKS_TAB == undefined ->
+            {skip,"Define the TEST_HOOKS macro to run this test"};
+       true ->
+            ct:print("********** ~w **********", [TestHooksCase]),
+            Config
+    end;
+init_per_testcase(TestCase, Config) ->
+    ct:print("********** ~w **********", [TestCase]),
+    Config.
+
+end_per_testcase(Case, Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+groups() ->
+    [].
+
+all() -> 
+    [add_remove_instance_tty,
+     add_remove_instance_standard_io,
+     add_remove_instance_standard_error,
+     add_remove_instance_file1,
+     add_remove_instance_file2,
+     default_formatter,
+     errors,
+     formatter_fail,
+     config_fail,
+     crash_std_h_to_file,
+     crash_std_h_to_disk_log,
+     bad_input,
+     info_and_reset,
+     reconfig,
+     file_opts,
+     filesync,
+     write_failure,
+     sync_failure,
+     op_switch_to_sync_file,
+     op_switch_to_sync_tty,
+     op_switch_to_drop_file,
+     op_switch_to_drop_tty,
+     op_switch_to_flush_file,
+     op_switch_to_flush_tty,
+     limit_burst_disabled,
+     limit_burst_enabled_one,
+     limit_burst_enabled_period,
+     kill_disabled,
+     qlen_kill_new,
+     qlen_kill_std,
+     mem_kill_new,
+     mem_kill_std,
+     restart_after,
+     handler_requests_under_load
+    ].
+
+add_remove_instance_tty(_Config) ->
+    {error,{handler_not_added,{invalid_config,logger_std_h,{type,tty}}}} =
+        logger:add_handler(?MODULE,logger_std_h,
+                           #{logger_std_h => #{type => tty},
+                             filter_default=>log,
+                             formatter=>{?MODULE,self()}}),
+    ok.
+
+add_remove_instance_standard_io(_Config) ->
+    add_remove_instance_nofile(standard_io).
+add_remove_instance_standard_io(cleanup,_Config) ->
+    logger_std_h_remove().
+
+add_remove_instance_standard_error(_Config) ->
+    add_remove_instance_nofile(standard_error).
+add_remove_instance_standard_error(cleanup,_Config) ->
+    logger_std_h_remove().
+
+add_remove_instance_file1(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir,"stdlog1.txt"),
+    Type = {file,Log},
+    add_remove_instance_file(Log, Type).
+add_remove_instance_file1(cleanup,_Config) ->
+    logger_std_h_remove().
+
+add_remove_instance_file2(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir,"stdlog2.txt"),
+    Type = {file,Log,[raw,append]},
+    add_remove_instance_file(Log, Type).
+add_remove_instance_file2(cleanup,_Config) ->
+    logger_std_h_remove().
+
+add_remove_instance_file(Log, Type) ->
+    ok = logger:add_handler(?MODULE,
+                            logger_std_h,
+                            #{logger_std_h => #{type => Type},
+                              filter_default=>stop,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+    Pid = whereis(?MODULE),
+    true = is_pid(Pid),
+    logger:info(M1=?msg,?domain),
+    ?check(M1),
+    B1 = ?bin(M1),
+    try_read_file(Log, {ok,B1}, ?FILESYNC_REP_INT),
+    ok = logger:remove_handler(?MODULE),
+    timer:sleep(500),
+    undefined = whereis(?MODULE),
+    logger:info(?msg,?domain),
+    ?check_no_log,
+    try_read_file(Log, {ok,B1}, ?FILESYNC_REP_INT),
+    ok.
+
+default_formatter(_Config) ->
+    ok = logger:set_handler_config(?STANDARD_HANDLER,formatter,
+                                   {?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}),
+    ct:capture_start(),
+    logger:info(M1=?msg),
+    timer:sleep(100),
+    ct:capture_stop(),
+    [Msg] = ct:capture_get(),
+    match = re:run(Msg,"=INFO REPORT====.*\n"++M1,[{capture,none}]),
+    ok.
+
+errors(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir,?FUNCTION_NAME),
+
+    ok = logger:add_handler(?MODULE,logger_std_h,#{}),
+    {error,{already_exist,?MODULE}} =
+        logger:add_handler(?MODULE,logger_std_h,#{}),
+    
+    {error,{not_found,no_such_name}} = logger:remove_handler(no_such_name),
+
+    ok = logger:remove_handler(?MODULE),
+    {error,{not_found,?MODULE}} = logger:remove_handler(?MODULE),
+
+    {error,
+     {handler_not_added,
+      {invalid_config,logger_std_h,{type,faulty_type}}}} =
+        logger:add_handler(?MODULE,logger_std_h,
+                           #{logger_std_h => #{type => faulty_type}}),
+
+    NoDir = lists:concat(["/",?MODULE,"_dir"]),
+    {error,
+     {handler_not_added,{{open_failed,NoDir,eacces},_}}} =
+        logger:add_handler(myh2,logger_std_h,
+                           #{logger_std_h=>#{type=>{file,NoDir}}}),
+
+    {error,
+     {handler_not_added,{{open_failed,Log,_},_}}} =
+        logger:add_handler(myh3,logger_std_h,
+                           #{logger_std_h=>#{type=>{file,Log,[bad_file_opt]}}}),
+
+    ok = logger:info(?msg).
+
+errors(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+formatter_fail(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir,?FUNCTION_NAME),
+
+    %% no formatter
+    ok = logger:add_handler(?MODULE,
+                            logger_std_h,
+                            #{logger_std_h => #{type => {file,Log}},
+                              filter_default=>stop,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE])}),
+    Pid = whereis(?MODULE),
+    true = is_pid(Pid),
+    {ok,#{handlers:=H}} = logger:get_logger_config(),
+    true = lists:member(?MODULE,H),
+
+    %% Formatter is added automatically
+    {ok,{_,#{formatter:={logger_formatter,_}}}} =
+        logger:get_handler_config(?MODULE),
+    logger:info(M1=?msg,?domain),
+    Got1 = try_match_file(Log,"=INFO REPORT====.*\n"++M1,5000),
+
+    ok = logger:set_handler_config(?MODULE,formatter,{nonexistingmodule,#{}}),
+    logger:info(M2=?msg,?domain),
+    Got2 = try_match_file(Log,
+                          Got1++"=INFO REPORT====.*\nFORMATTER CRASH: .*"++M2,
+                          5000),
+
+    ok = logger:set_handler_config(?MODULE,formatter,{?MODULE,crash}),
+    logger:info(M3=?msg,?domain),
+    Got3 = try_match_file(Log,
+                          Got2++"=INFO REPORT====.*\nFORMATTER CRASH: .*"++M3,
+                          5000),
+
+    ok = logger:set_handler_config(?MODULE,formatter,{?MODULE,bad_return}),
+    logger:info(?msg,?domain),
+    try_match_file(Log,
+                   Got3++"FORMATTER ERROR: bad_return_value",
+                   5000),
+
+    %% Check that handler is still alive and was never dead
+    Pid = whereis(?MODULE),
+    {ok,#{handlers:=H}} = logger:get_logger_config(),
+
+    ok.
+
+formatter_fail(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+config_fail(_Config) ->
+    {error,{handler_not_added,{invalid_config,logger_std_h,{bad,bad}}}} =
+        logger:add_handler(?MODULE,logger_std_h,
+                           #{logger_std_h => #{bad => bad},
+                             filter_default=>log,
+                             formatter=>{?MODULE,self()}}),
+    {error,{handler_not_added,{invalid_config,logger_std_h,
+                               {restart_type,bad}}}} =
+        logger:add_handler(?MODULE,logger_std_h,
+                           #{logger_std_h => #{restart_type => bad},
+                             filter_default=>log,
+                             formatter=>{?MODULE,self()}}),
+    {error,{handler_not_added,{invalid_levels,{42,42,_}}}} =
+        logger:add_handler(?MODULE,logger_std_h,
+                           #{logger_std_h => #{toggle_sync_qlen=>42,
+                                               drop_new_reqs_qlen=>42}}),
+
+    ok = logger:add_handler(?MODULE,logger_std_h,
+                            #{filter_default=>log,
+                              formatter=>{?MODULE,self()}}),
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(?MODULE,logger_std_h,
+                                  #{type=>{file,"file"}}),
+    {error,{illegal_config_change,_,_}} =
+        logger:set_handler_config(?MODULE,id,bad),
+    {error,{invalid_levels,_}} =
+        logger:set_handler_config(?MODULE,logger_std_h,
+                                  #{toggle_sync_qlen=>100,
+                                    flush_reqs_qlen=>99}),
+    {error,{invalid_config,logger_std_h,{filesync_rep_int,2000}}} =
+        logger:set_handler_config(?MODULE, logger_std_h,
+                                  #{filesync_rep_int => 2000}),
+    ok.
+
+config_fail(cleanup,_Config) ->
+    logger:remove_handler(?MODULE).
+
+crash_std_h_to_file(Config) ->
+    crash_std_h(Config,?FUNCTION_NAME,logger_dest,file).
+crash_std_h_to_file(cleanup,_Config) ->
+    crash_std_h(cleanup).
+
+crash_std_h_to_disk_log(Config) ->
+    crash_std_h(Config,?FUNCTION_NAME,logger_dest,disk_log).
+crash_std_h_to_disk_log(cleanup,_Config) ->
+    crash_std_h(cleanup).
+
+crash_std_h(Config,Func,Var,Type) ->
+    Dir = ?config(priv_dir,Config),
+    File = lists:concat([?MODULE,"_",Func,".log"]),
+    Log = filename:join(Dir,File),
+    Pa = filename:dirname(code:which(?MODULE)),
+    TypeAndLog =
+        case os:type() of
+            {win32,_} ->
+                lists:concat([" {",Type,",\\\"",Log,"\\\"}"]);
+            _ ->
+                lists:concat([" \'{",Type,",\"",Log,"\"}\'"])
+        end,
+    Args = lists:concat([" -kernel ",Var,TypeAndLog," -pa ",Pa]),
+    Name = lists:concat([?MODULE,"_",Func]),
+    ct:pal("Starting ~p with ~tp", [Name,Args]),
+    %% Start a node which prints kernel logs to the destination specified by Type
+    {ok,Node} = test_server:start_node(Name, peer, [{args, Args}]),
+    Pid = rpc:call(Node,erlang,whereis,[?STANDARD_HANDLER]),
+    ok = rpc:call(Node,logger,set_handler_config,[?STANDARD_HANDLER,formatter,
+                                                  {?MODULE,self()}]),
+    ok = log_on_remote_node(Node,"dummy1"),
+    ?check("dummy1"),
+    {ok,Bin1} = sync_and_read(Node,Type,Log),
+    <<"dummy1\n">> = binary:part(Bin1,{byte_size(Bin1),-7}),
+
+    %% Kill the logger_std_h process
+    exit(Pid, kill),
+
+    %% Wait a bit, then check that it is gone
+    timer:sleep(2000),
+    undefined = rpc:call(Node,erlang,whereis,[?STANDARD_HANDLER]),
+
+    %% Check that file is not empty
+    {ok,Bin2} = sync_and_read(Node,Type,Log),
+    <<"dummy1\n">> = binary:part(Bin2,{byte_size(Bin2),-7}),
+    ok.
+
+%% Can not use rpc:call here, since the code would execute on a
+%% process with group_leader on this (the calling) node, and thus
+%% logger would send the log event to the logger process here instead
+%% of logging it itself.
+log_on_remote_node(Node,Msg) ->
+    _ = spawn_link(Node,
+                   fun() -> erlang:group_leader(whereis(user),self()),
+                            logger:info(Msg)
+                   end),
+    ok.
+
+
+crash_std_h(cleanup) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes].
+
+sync_and_read(Node,disk_log,Log) ->
+    rpc:call(Node,logger_disk_log_h,disk_log_sync,[?STANDARD_HANDLER]),
+    case file:read_file(Log ++ ".1") of
+        {ok,<<>>} ->
+            timer:sleep(5000),
+            file:read_file(Log ++ ".1");
+        Ok ->
+            Ok
+    end;
+sync_and_read(Node,file,Log) ->
+    rpc:call(Node,logger_std_h,filesync,[?STANDARD_HANDLER]),
+    case file:read_file(Log) of
+        {ok,<<>>} ->
+            timer:sleep(5000),
+            file:read_file(Log);
+        Ok ->
+            Ok
+    end.
+
+bad_input(_Config) ->
+    {error,{badarg,{filesync,["BadType"]}}} = logger_std_h:filesync("BadType"),
+    {error,{badarg,{info,["BadType"]}}} = logger_std_h:info("BadType"),
+    {error,{badarg,{reset,["BadType"]}}} = logger_std_h:reset("BadType").
+
+
+info_and_reset(_Config) ->
+    #{id := ?STANDARD_HANDLER} = logger_std_h:info(?STANDARD_HANDLER),
+    ok = logger_std_h:reset(?STANDARD_HANDLER).
+
+reconfig(Config) ->
+    Dir = ?config(priv_dir,Config),
+    ok = logger:add_handler(?MODULE,
+                            logger_std_h,
+                            #{logger_std_h => #{type => standard_io},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+    #{id := ?MODULE,
+      type := standard_io,
+      file_ctrl_pid := FileCtrlPid, 
+      toggle_sync_qlen := ?TOGGLE_SYNC_QLEN,
+      drop_new_reqs_qlen := ?DROP_NEW_REQS_QLEN,
+      flush_reqs_qlen := ?FLUSH_REQS_QLEN,
+      enable_burst_limit := ?ENABLE_BURST_LIMIT,
+      burst_limit_size := ?BURST_LIMIT_SIZE,
+      burst_window_time := ?BURST_WINDOW_TIME,
+      enable_kill_overloaded := ?ENABLE_KILL_OVERLOADED,
+      handler_overloaded_qlen := ?HANDLER_OVERLOADED_QLEN,
+      handler_overloaded_mem := ?HANDLER_OVERLOADED_MEM,
+      handler_restart_after := ?HANDLER_RESTART_AFTER,
+      filesync_repeat_interval := ?FILESYNC_REPEAT_INTERVAL} =
+        logger_std_h:info(?MODULE),
+
+    ok = logger:set_handler_config(?MODULE, logger_std_h,
+                                   #{toggle_sync_qlen => 1,
+                                     drop_new_reqs_qlen => 2,
+                                     flush_reqs_qlen => 3,
+                                     enable_burst_limit => false,
+                                     burst_limit_size => 10,
+                                     burst_window_time => 10,
+                                     enable_kill_overloaded => true,
+                                     handler_overloaded_qlen => 100000,
+                                     handler_overloaded_mem => 10000000,
+                                     handler_restart_after => never,
+                                     filesync_repeat_interval => no_repeat}),
+    #{id := ?MODULE,
+      type := standard_io,
+      file_ctrl_pid := FileCtrlPid, 
+      toggle_sync_qlen := 1,
+      drop_new_reqs_qlen := 2,
+      flush_reqs_qlen := 3,
+      enable_burst_limit := false,
+      burst_limit_size := 10,
+      burst_window_time := 10,
+      enable_kill_overloaded := true,
+      handler_overloaded_qlen := 100000,
+      handler_overloaded_mem := 10000000,
+      handler_restart_after := never,
+      filesync_repeat_interval := no_repeat} = logger_std_h:info(?MODULE),
+    ok.
+
+reconfig(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+
+file_opts(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir, lists:concat([?FUNCTION_NAME,".log"])),
+    BadFileOpts = [raw],
+    BadType = {file,Log,BadFileOpts},
+    {error,{handler_not_added,{{open_failed,Log,enoent},_}}} =
+        logger:add_handler(?MODULE, logger_std_h,
+                           #{logger_std_h => #{type => BadType}}),
+
+    OkFileOpts = [raw,append],
+    OkType = {file,Log,OkFileOpts},
+    ok = logger:add_handler(?MODULE,
+                            logger_std_h,
+                            #{logger_std_h => #{type => OkType},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+
+    #{type := OkType} = logger_std_h:info(?MODULE),
+    logger:info(M1=?msg,?domain),
+    ?check(M1),
+    B1 = ?bin(M1),
+    try_read_file(Log, {ok,B1}, ?FILESYNC_REP_INT),
+    ok.
+file_opts(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+
+filesync(Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir, lists:concat([?FUNCTION_NAME,".log"])),
+    Type = {file,Log},
+    ok = logger:add_handler(?MODULE,
+                            logger_std_h,
+                            #{logger_std_h => #{type => Type},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+    Tester = self(),
+    TraceFun = fun({trace,_,call,{Mod,Func,Details}}, Pid) ->
+                       Pid ! {trace,Mod,Func,Details},
+                       Pid;
+                  ({trace,TPid,'receive',Received}, Pid) ->
+                       Pid ! {trace,TPid,Received},
+                       Pid
+               end,
+    {ok,_} = dbg:tracer(process, {TraceFun, Tester}),
+    FileCtrlPid = maps:get(file_ctrl_pid , logger_std_h:info(?MODULE)),
+    {ok,_} = dbg:p(FileCtrlPid, [c]),
+    {ok,_} = dbg:tpl(logger_std_h, write_to_dev, 5, []),
+    {ok,_} = dbg:tpl(logger_std_h, sync_dev, 4, []),
+    {ok,_} = dbg:tp(file, datasync, 1, []),
+
+    logger:info("first", ?domain),
+    %% wait for automatic filesync
+    timer:sleep(?FILESYNC_REP_INT),
+    Expected1 = [{log,"first"}, {trace,logger_std_h,write_to_dev},
+                 {trace,logger_std_h,sync_dev}, {trace,file,datasync}],
+    
+    logger:info("second", ?domain),
+    %% do explicit filesync
+    logger_std_h:filesync(?MODULE),
+    %% a second filesync should be ignored
+    logger_std_h:filesync(?MODULE),
+    Expected2 =  [{log,"second"}, {trace,logger_std_h,write_to_dev},
+                  {trace,logger_std_h,sync_dev}, {trace,file,datasync}],
+
+    %% check that if there's no repeated filesync active,
+    %% a filesync is still performed when handler goes idle
+    logger:set_handler_config(?MODULE, logger_std_h,
+                              #{filesync_repeat_interval => no_repeat}),
+    no_repeat = maps:get(filesync_repeat_interval, logger_std_h:info(?MODULE)),
+    logger:info("third", ?domain),
+    timer:sleep(?IDLE_DETECT_TIME_MSEC*2),
+    logger:info("fourth", ?domain),
+    %% wait for automatic filesync
+    timer:sleep(?IDLE_DETECT_TIME_MSEC*2),
+    Expected3 = [{log,"third"}, {trace,logger_std_h,write_to_dev},
+                 {log,"fourth"}, {trace,logger_std_h,write_to_dev},
+                 {trace,logger_std_h,sync_dev}, {trace,file,datasync}],
+
+    dbg:stop_clear(),
+
+    %% verify that filesync has been performed as expected
+    Received1 = lists:map(fun({trace,M,F,_}) -> {trace,M,F};
+                             (Other) -> Other
+                          end, test_server:messages_get()),
+    ct:pal("Trace #1 =~n~p", [Received1]),
+    Received1 = Expected1 ++ Expected2 ++ Expected3,
+
+    try_read_file(Log, {ok,<<"first\nsecond\nthird\nfourth\n">>}, 1000),
+    
+    {ok,_} = dbg:tracer(process, {TraceFun, Tester}),
+    {ok,_} = dbg:p(whereis(?MODULE), [c]),
+    {ok,_} = dbg:tpl(logger_std_h, handle_cast, 2, []),
+
+    %% switch repeated filesync on and verify that the looping works
+    SyncInt = 1000,
+    WaitT = 4500,
+    logger:set_handler_config(?MODULE, logger_std_h,
+                              #{filesync_repeat_interval => SyncInt}),
+    SyncInt = maps:get(filesync_repeat_interval, logger_std_h:info(?MODULE)),
+    timer:sleep(WaitT),
+    logger:set_handler_config(?MODULE, logger_std_h,
+                              #{filesync_repeat_interval => no_repeat}),    
+    dbg:stop_clear(),
+
+    Received2 = lists:map(fun({trace,_M,handle_cast,[{Op,_},_]}) -> {trace,Op};
+                             (Other) -> Other
+                          end, test_server:messages_get()),
+    ct:pal("Trace #2 =~n~p", [Received2]),
+    OneSync = [{trace,repeated_filesync}],
+    %% receive 1 initial repeated_filesync, then 1 per sec
+    Received2 =
+        lists:flatten([OneSync || _ <- lists:seq(1, 1 + trunc(WaitT/SyncInt))]),
+    ok.
+filesync(cleanup, _Config) ->
+    logger:remove_handler(?MODULE).
+
+write_failure(Config) ->
+    Dir = ?config(priv_dir, Config),
+    File = lists:concat([?MODULE,"_",?FUNCTION_NAME,".log"]),
+    Log = filename:join(Dir, File),
+    Node = start_std_h_on_new_node(Config, ?FUNCTION_NAME, Log),
+    false = (undefined == rpc:call(Node, ets, whereis, [?TEST_HOOKS_TAB])),
+    rpc:call(Node, ets, insert, [?TEST_HOOKS_TAB,{tester,self()}]),
+    rpc:call(Node, ?MODULE, set_internal_log, [?MODULE,internal_log]),
+    rpc:call(Node, ?MODULE, set_result, [file_write,ok]),
+
+    ok = log_on_remote_node(Node, "Logged1"),
+    rpc:call(Node, logger_std_h, filesync, [?STANDARD_HANDLER]),
+    ?check_no_log,
+    try_read_file(Log, {ok,<<"Logged1\n">>}, ?FILESYNC_REP_INT),
+
+    rpc:call(Node, ?MODULE, set_result, [file_write,{error,terminated}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+
+    ?check({error,{?STANDARD_HANDLER,write,Log,{error,terminated}}}),
+
+    ok = log_on_remote_node(Node, "No second error printout"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result, [file_write,{error,eacces}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    ?check({error,{?STANDARD_HANDLER,write,Log,{error,eacces}}}),
+
+    rpc:call(Node, ?MODULE, set_result, [file_write,ok]),
+    ok = log_on_remote_node(Node, "Logged2"),
+    rpc:call(Node, logger_std_h, filesync, [?STANDARD_HANDLER]),
+    ?check_no_log,
+    try_read_file(Log, {ok,<<"Logged1\nLogged2\n">>}, ?FILESYNC_REP_INT),
+    ok.
+write_failure(cleanup, _Config) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes].
+
+sync_failure(Config) ->
+    Dir = ?config(priv_dir, Config),
+    File = lists:concat([?MODULE,"_",?FUNCTION_NAME,".log"]),
+    Log = filename:join(Dir, File),
+    Node = start_std_h_on_new_node(Config, ?FUNCTION_NAME, Log),
+    false = (undefined == rpc:call(Node, ets, whereis, [?TEST_HOOKS_TAB])),
+    rpc:call(Node, ets, insert, [?TEST_HOOKS_TAB,{tester,self()}]),
+    rpc:call(Node, ?MODULE, set_internal_log, [?MODULE,internal_log]),
+    rpc:call(Node, ?MODULE, set_result, [file_datasync,ok]),
+    
+    SyncInt = 500,
+    ok = rpc:call(Node, logger, set_handler_config,
+                  [?STANDARD_HANDLER, logger_std_h,
+                   #{filesync_repeat_interval => SyncInt}]),
+    Info = rpc:call(Node, logger_std_h, info, [?STANDARD_HANDLER]),
+    SyncInt = maps:get(filesync_repeat_interval, Info),
+    
+    ok = log_on_remote_node(Node, "Logged1"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result, [file_datasync,{error,terminated}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    
+    ?check({error,{?STANDARD_HANDLER,filesync,Log,{error,terminated}}}),
+
+    ok = log_on_remote_node(Node, "No second error printout"),
+    ?check_no_log,
+
+    rpc:call(Node, ?MODULE, set_result, [file_datasync,{error,eacces}]),
+    ok = log_on_remote_node(Node, "Cause simple error printout"),
+    ?check({error,{?STANDARD_HANDLER,filesync,Log,{error,eacces}}}),
+
+    rpc:call(Node, ?MODULE, set_result, [file_datasync,ok]),
+    ok = log_on_remote_node(Node, "Logged2"),
+    ?check_no_log,
+    ok.
+sync_failure(cleanup, _Config) ->
+    Nodes = nodes(),
+    [test_server:stop_node(Node) || Node <- Nodes].
+
+start_std_h_on_new_node(_Config, Func, Log) ->
+    Pa = filename:dirname(code:which(?MODULE)),
+    Dest =
+        case os:type() of
+            {win32,_} ->
+                lists:concat([" {file,\\\"",Log,"\\\"}"]);
+            _ ->
+                lists:concat([" \'{file,\"",Log,"\"}\'"])
+        end,
+    Args = lists:concat([" -kernel ",logger_dest,Dest," -pa ",Pa]),
+    Name = lists:concat([?MODULE,"_",Func]),
+    ct:pal("Starting ~s with ~tp", [Name,Args]),
+    {ok,Node} = test_server:start_node(Name, peer, [{args, Args}]),
+    Pid = rpc:call(Node,erlang,whereis,[?STANDARD_HANDLER]),
+    true = is_pid(Pid),
+    ok = rpc:call(Node,logger,set_handler_config,[?STANDARD_HANDLER,formatter,
+                                                  {?MODULE,nl}]),
+    Node.
+
+%% functions for test hook macros to be called by rpc
+set_internal_log(Mod, Func) ->
+    ?set_internal_log({Mod,Func}).
+set_result(Op, Result) ->
+    ?set_result(Op, Result).
+set_defaults() ->
+    ?set_defaults().
+
+%% internal log function that sends the term to the test case process
+internal_log(Type, Term) ->
+    [{tester,Tester}] = ets:lookup(?TEST_HOOKS_TAB, tester),
+    Tester ! {log,{Type,Term}},
+    logger:internal_log(Type, Term),
+    ok.
+
+
+%%%-----------------------------------------------------------------
+%%% Overload protection tests
+
+op_switch_to_sync_file(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 3,
+                                             drop_new_reqs_qlen => 501,
+                                             flush_reqs_qlen => 2000,
+                                             enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    %%    TRecvPid = start_op_trace(),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    NumOfReqs = count_lines(Log),
+    %% true = analyse_trace(TRecvPid,
+    %%                      fun(Events) -> find_mode(async,Events) end),
+    %% true = analyse_trace(TRecvPid,
+    %%                      fun(Events) -> find_mode(sync,Events) end),
+    %% true = analyse_trace(TRecvPid,
+    %%                      fun(Events) -> find_switch(async,sync,Events) end),
+    %% false = analyse_trace(TRecvPid,
+    %%                       fun(Events) -> find_mode(drop,Events) end),
+    %% false = analyse_trace(TRecvPid,
+    %%                       fun(Events) -> find_mode(flush,Events) end),    
+    ok = file:delete(Log),
+    %%    stop_op_trace(TRecvPid),
+    ok.
+op_switch_to_sync_file(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_sync_tty(Config) ->
+    {HConfig,StdHConfig} = start_handler(?MODULE, standard_io, Config),
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 3,
+                                             drop_new_reqs_qlen => 501,
+                                             flush_reqs_qlen => 2000,
+                                             enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    ok.
+op_switch_to_sync_tty(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_drop_file(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 2,
+                                             drop_new_reqs_qlen => 3,
+                                             flush_reqs_qlen => 600,
+                                             enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    %%    TRecvPid = start_op_trace(),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages dropped = ~w (~w)",
+           [NumOfReqs-Logged,NumOfReqs]),
+    true = (Logged < NumOfReqs),
+    %% true = analyse_trace(TRecvPid,
+    %%                      fun(Events) -> find_mode(async,Events) end),
+    %% true = analyse_trace(TRecvPid,
+    %%                       fun(Events) -> find_mode(drop,Events) end),
+    %% false = analyse_trace(TRecvPid,
+    %%                       fun(Events) -> find_mode(flush,Events) end),
+    %% true = analyse_trace(TRecvPid,
+    %%                      fun(Events) -> find_switch(async,drop,Events)
+    %%                                     orelse find_switch(sync,drop,Events)
+    %%                      end),
+    ok = file:delete(Log),
+    %%    stop_op_trace(TRecvPid),
+    ok.
+op_switch_to_drop_file(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_drop_tty(Config) ->
+    {HConfig,StdHConfig} = start_handler(?MODULE, standard_io, Config),
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 2,
+                                             drop_new_reqs_qlen => 3,
+                                             flush_reqs_qlen => 600,
+                                             enable_burst_limit => false}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 500,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    ok.
+op_switch_to_drop_tty(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_flush_file() ->
+    [{timetrap,{seconds,60}}].
+op_switch_to_flush_file(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+
+    %% it's important that both async and sync requests have been queued
+    %% when the flush happens (verify with coverage of flush_log_requests/2)
+
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 2,
+                                             drop_new_reqs_qlen => 99,
+                                             flush_reqs_qlen => 100,
+                                             enable_burst_limit => false}},    
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 10000,
+    Procs = 100,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages flushed/dropped = ~w (~w)",
+           [(NumOfReqs*Procs)-Logged,NumOfReqs*Procs]),
+    true = (Logged < (NumOfReqs*Procs)),
+
+    %%! --- Thu Apr 12 13:46:00 2018 --- peppe was here!
+    %%! TODO: Verify that handler has switched to flush mode
+
+    ok = file:delete(Log),
+    ok.
+op_switch_to_flush_file(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+op_switch_to_flush_tty(Config) ->
+    {HConfig,StdHConfig} = start_handler(?MODULE, standard_io, Config),
+
+    %% it's important that both async and sync requests have been queued
+    %% when the flush happens (verify with coverage of flush_log_requests/2)
+
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 2,
+                                             drop_new_reqs_qlen => 99,
+                                             flush_reqs_qlen => 100,
+                                             enable_burst_limit => false}},   
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 10000,
+    Procs = 10,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    ok.
+op_switch_to_flush_tty(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+limit_burst_disabled(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{enable_burst_limit => false,
+                                             burst_limit_size => 10,
+                                             burst_window_time => 2000,
+                                             drop_new_reqs_qlen => 200,
+                                             flush_reqs_qlen => 300}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    NumOfReqs = Logged.
+limit_burst_disabled(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+limit_burst_enabled_one(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    ReqLimit = 10,
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{enable_burst_limit => true,
+                                             burst_limit_size => ReqLimit,
+                                             burst_window_time => 2000,
+                                             drop_new_reqs_qlen => 200,
+                                             flush_reqs_qlen => 300}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    ReqLimit = Logged.
+limit_burst_enabled_one(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+limit_burst_enabled_period(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    ReqLimit = 10,
+    BurstTWin = 1000,
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{enable_burst_limit => true,
+                                             burst_limit_size => ReqLimit,
+                                             burst_window_time => BurstTWin,
+                                             drop_new_reqs_qlen => 20000,
+                                             flush_reqs_qlen => 20001}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+
+    Windows = 3,
+    Sent = send_burst({t,BurstTWin*Windows}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages sent = ~w~nNumber of messages logged = ~w",
+           [Sent,Logged]),
+    ok = file:delete(Log),
+    true = (Logged > (ReqLimit*Windows)) andalso
+           (Logged < (ReqLimit*(Windows+2))).
+limit_burst_enabled_period(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+kill_disabled(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+     NewHConfig =
+        HConfig#{logger_std_h=>StdHConfig#{enable_kill_overloaded=>false,
+                                           handler_overloaded_qlen=>10,
+                                           handler_overloaded_mem=>100}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    NumOfReqs = 100,
+    send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    Logged = count_lines(Log),
+    ct:pal("Number of messages logged = ~w", [Logged]),
+    ok = file:delete(Log),
+    true = is_pid(whereis(?MODULE)),
+    ok.
+kill_disabled(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+qlen_kill_new(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    Pid0 = whereis(?MODULE),
+    {_,Mem0} = process_info(Pid0, memory),
+    RestartAfter = 2000,
+     NewHConfig =
+        HConfig#{logger_std_h=>StdHConfig#{enable_kill_overloaded=>true,
+                                           handler_overloaded_qlen=>10,
+                                           handler_overloaded_mem=>Mem0+50000,
+                                           handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    MRef = erlang:monitor(process, Pid0),
+    NumOfReqs = 100,
+    Procs = 2,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    %% send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    receive
+        {'DOWN', MRef, _, _, Info} ->
+           case Info of
+                {shutdown,{overloaded,?MODULE,QLen,Mem}} ->
+                    ct:pal("Terminated with qlen = ~w, mem = ~w", [QLen,Mem]);
+                killed ->
+                    ct:pal("Slow shutdown, handler process was killed!", [])
+            end,
+            timer:sleep(RestartAfter + 1000),
+            true = is_pid(whereis(?MODULE)),
+            ok
+    after
+        5000 ->
+            Info = logger_std_h:info(?MODULE),
+            ct:pal("Handler state = ~p", [Info]),
+            ct:fail("Handler not dead! It should not have survived this!")
+    end.
+qlen_kill_new(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+%% choke the standard handler on remote node to verify the termination
+%% works as expected    
+qlen_kill_std(Config) ->
+    %%! HERE
+    %% Dir = ?config(priv_dir, Config),
+    %% File = lists:concat([?MODULE,"_",?FUNCTION_NAME,".log"]),
+    %% Log = filename:join(Dir, File),
+    %% Node = start_std_h_on_new_node(Config, ?FUNCTION_NAME, Log),
+    %% ok = rpc:call(Node, logger, set_handler_config,
+    %%               [?STANDARD_HANDLER, logger_std_h,
+    %%                #{enable_kill_overloaded=>true,
+    %%                  handler_overloaded_qlen=>10,
+    %%                  handler_overloaded_mem=>100000}]),
+    {skip,"Not done yet"}.
+
+mem_kill_new(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    Pid0 = whereis(?MODULE),
+    {_,Mem0} = process_info(Pid0, memory),
+    RestartAfter = 2000,
+     NewHConfig =
+        HConfig#{logger_std_h=>StdHConfig#{enable_kill_overloaded=>true,
+                                           handler_overloaded_qlen=>50000,
+                                           handler_overloaded_mem=>Mem0+500,
+                                           handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    MRef = erlang:monitor(process, Pid0),
+    NumOfReqs = 100,
+    Procs = 2,
+    send_burst({n,NumOfReqs}, {spawn,Procs,0}, {chars,79}, info),
+    %% send_burst({n,NumOfReqs}, seq, {chars,79}, info),
+    receive
+        {'DOWN', MRef, _, _, Info} ->
+            case Info of
+                {shutdown,{overloaded,?MODULE,QLen,Mem}} ->
+                    ct:pal("Terminated with qlen = ~w, mem = ~w", [QLen,Mem]);
+                killed ->
+                    ct:pal("Slow shutdown, handler process was killed!", [])
+            end,
+            timer:sleep(RestartAfter * 2),
+            true = is_pid(whereis(?MODULE)),
+            ok
+    after
+        5000 ->
+            Info = logger_std_h:info(?MODULE),
+            ct:pal("Handler state = ~p", [Info]),
+            ct:fail("Handler not dead! It should not have survived this!")
+    end.
+mem_kill_new(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+    
+%% choke the standard handler on remote node to verify the termination
+%% works as expected
+mem_kill_std(Config) ->
+    {skip,"Not done yet"}.
+
+restart_after(Config) ->
+    {Log,HConfig,StdHConfig} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+     NewHConfig1 =
+        HConfig#{logger_std_h=>StdHConfig#{enable_kill_overloaded=>true,
+                                           handler_overloaded_qlen=>10,
+                                           handler_restart_after=>never}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig1),
+    MRef1 = erlang:monitor(process, whereis(?MODULE)),
+    %% kill handler
+    send_burst({n,100}, {spawn,2,0}, {chars,79}, info),
+    receive
+        {'DOWN', MRef1, _, _, _Info1} ->
+            timer:sleep(?HANDLER_RESTART_AFTER + 1000),
+            undefined = whereis(?MODULE),
+            ok
+    after
+        5000 ->
+            ct:fail("Handler not dead! It should not have survived this!")
+    end,
+    
+    {Log,_,_} = start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    RestartAfter = 2000,
+    NewHConfig2 =
+        HConfig#{logger_std_h=>StdHConfig#{enable_kill_overloaded=>true,
+                                           handler_overloaded_qlen=>10,
+                                           handler_restart_after=>RestartAfter}},
+    ok = logger:set_handler_config(?MODULE, NewHConfig2),
+    Pid0 = whereis(?MODULE),
+    MRef2 = erlang:monitor(process, Pid0),
+    %% kill handler
+    send_burst({n,100}, {spawn,2,0}, {chars,79}, info),
+    receive
+        {'DOWN', MRef2, _, _, _Info2} ->
+            timer:sleep(RestartAfter + 1000),
+            Pid1 = whereis(?MODULE),
+            true = is_pid(Pid1),
+            false = (Pid1 == Pid0),
+            ok
+    after
+        5000 ->
+            ct:fail("Handler not dead! It should not have survived this!")
+    end,
+    ok.
+restart_after(cleanup, _Config) ->
+    ok = stop_handler(?MODULE).
+
+%% send handler requests (filesync, info, reset, change_config)
+%% during high load to verify that sync, dropping and flushing is
+%% handled correctly.
+handler_requests_under_load() ->
+    [{timetrap,{seconds,60}}].
+handler_requests_under_load(Config) ->
+    {Log,HConfig,StdHConfig} =
+        start_handler(?MODULE, ?FUNCTION_NAME, Config),
+    NewHConfig =
+        HConfig#{logger_std_h => StdHConfig#{toggle_sync_qlen => 2,
+                                             drop_new_reqs_qlen => 1000,
+                                             flush_reqs_qlen => 2000,
+                                             enable_burst_limit => false}},   
+    ok = logger:set_handler_config(?MODULE, NewHConfig),
+    Pid = spawn_link(fun() -> send_requests(?MODULE, 1, [{filesync,[]},
+                                                         {info,[]},
+                                                         {reset,[]},
+                                                         {change_config,[]}])
+                     end),
+    Sent = send_burst({t,10000}, seq, {chars,79}, info),
+    Pid ! {self(),finish},
+    ReqResult = receive {Pid,Result} -> Result end,
+    Logged = count_lines(Log),
+    ct:pal("Number of messages sent = ~w~nNumber of messages logged = ~w",
+           [Sent,Logged]),
+    FindError = fun(Res) ->
+                        [E || E <- Res,
+                              is_tuple(E) andalso (element(1,E) == error)]
+                end,
+    Errors = [{Req,FindError(Res)} || {Req,Res} <- ReqResult],
+    NoOfReqs = lists:foldl(fun({_,Res}, N) -> N + length(Res) end, 0, ReqResult),
+    ct:pal("~w requests made. Errors: ~n~p", [NoOfReqs,Errors]),
+    ok = file:delete(Log).
+handler_requests_under_load(cleanup, Config) ->
+    ok = stop_handler(?MODULE).
+
+send_requests(HName, TO, Reqs = [{Req,Res}|Rs]) ->
+    receive
+        {From,finish} ->
+            From ! {self(),Reqs}
+    after
+        TO ->
+            Result =
+                case Req of
+                    change_config ->
+                        logger:set_handler_config(HName, logger_std_h,
+                                                  #{enable_kill_overloaded =>
+                                                        false});
+                    Func ->
+                        logger_std_h:Func(HName)
+                end,
+            send_requests(HName, TO, Rs ++ [{Req,[Result|Res]}])
+    end.
+            
+
+%%%-----------------------------------------------------------------
+%%% 
+start_handler(Name, TTY, Config) when TTY == standard_io;
+                                      TTY == standard_error->
+    ok = logger:add_handler(Name,
+                            logger_std_h,
+                            #{logger_std_h => #{type => TTY},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([Name]),
+                              formatter=>{?MODULE,op}}),
+    {ok,{_,HConfig = #{logger_std_h := StdHConfig}}} =
+        logger:get_handler_config(Name),
+    {HConfig,StdHConfig};
+
+start_handler(Name, FuncName, Config) ->
+    Dir = ?config(priv_dir,Config),
+    Log = filename:join(Dir, lists:concat([FuncName,".log"])),
+    ct:pal("Logging to ~tp", [Log]),
+    Type = {file,Log},
+    ok = logger:add_handler(Name,
+                            logger_std_h,
+                            #{logger_std_h => #{type => Type},
+                              filter_default=>log,
+                              filters=>?DEFAULT_HANDLER_FILTERS([Name]),
+                              formatter=>{?MODULE,op}}),
+    {ok,{_,HConfig = #{logger_std_h := StdHConfig}}} =
+        logger:get_handler_config(Name),
+    {Log,HConfig,StdHConfig}.
+    
+stop_handler(Name) ->
+    ok = logger:remove_handler(Name),
+    ct:pal("Handler ~p stopped!", [Name]).    
+
+count_lines(File) ->
+    wait_until_written(File, -1),
+    count_lines1(File).
+
+wait_until_written(File, Sz) ->
+    timer:sleep(2000),
+    case file:read_file_info(File) of
+        {ok,#file_info{size = Sz}} ->
+            timer:sleep(1000),
+            case file:read_file_info(File) of
+                {ok,#file_info{size = Sz1}} ->
+                    ok;
+                {ok,#file_info{size = Sz2}} ->
+                    wait_until_written(File, Sz2)
+            end;
+        {ok,#file_info{size = Sz1}} ->
+            wait_until_written(File, Sz1)
+    end.
+    
+count_lines1(File) ->
+    Counter = fun Cnt(Dev,LC) ->
+                      case file:read_line(Dev) of
+                          eof -> LC;
+                          _   -> Cnt(Dev,LC+1)
+                      end
+              end,
+    {_,Dev} = file:open(File, [read]),
+    Lines = Counter(Dev, 0),
+    file:close(Dev),
+    Lines.
+
+send_burst(NorT, Type, {chars,Sz}, Class) ->
+    Text = [34 + rand:uniform(126-34) || _ <- lists:seq(1,Sz)],
+    case NorT of
+        {n,N} ->
+            %% process_flag(priority, high),
+            send_n_burst(N, Type, Text, Class),
+            %% process_flag(priority, normal),
+            N;
+        {t,T} ->
+            ct:pal("Sending messages sequentially for ~w ms", [T]),
+            T0 = erlang:monotonic_time(millisecond),
+            send_t_burst(T0, T, Text, Class, 0)
+    end.
+
+send_n_burst(0, _, _Text, _Class) ->
+    ok;
+send_n_burst(N, seq, Text, Class) ->
+    ok = logger:Class(Text, ?domain),
+    send_n_burst(N-1, seq, Text, Class);
+send_n_burst(N, {spawn,Ps,TO}, Text, Class) ->
+    ct:pal("~w processes each sending ~w messages", [Ps,N]),
+    PerProc = fun() -> 
+                      send_n_burst(N, seq, Text, Class)
+              end,
+    MRefs = [begin if TO == 0 -> ok; true -> timer:sleep(TO) end,
+                   monitor(process,spawn_link(PerProc)) end ||
+                _ <- lists:seq(1,Ps)],
+    lists:foreach(fun(MRef) ->
+                          receive
+                              {'DOWN', MRef, _, _, _} ->
+                                  ok
+                          end
+                  end, MRefs),
+    ct:pal("Message burst sent", []),
+    ok.
+
+send_t_burst(T0, T, Text, Class, N) ->
+    T1 = erlang:monotonic_time(millisecond),
+    if (T1-T0) > T ->
+            N;
+       true ->
+            ok = logger:Class(Text, ?domain),
+            send_t_burst(T0, T, Text, Class, N+1)
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Formatter callback
+%%% Using this to send the formatted string back to the test case
+%%% process - so it can check for logged events.
+format(_,bad_return) ->
+    bad_return;
+format(_,crash) ->
+    erlang:error(formatter_crashed);
+format(#{msg:={string,String0}},no_nl) ->
+    String = unicode:characters_to_list(String0),
+    String;
+format(#{msg:={string,String0}},nl) ->
+    String = unicode:characters_to_list(String0),
+    String++"\n";
+format(#{msg:={string,String0}},op) ->
+    String = unicode:characters_to_list(String0),
+    String++"\n";
+format(#{msg:={report,#{label:={supervisor,progress}}}},op) ->
+    "";
+format(#{msg:={report,#{label:={gen_server,terminate}}}},op) ->
+    "";
+format(#{msg:={report,#{label:={proc_lib,crash}}}},op) ->
+    "";
+format(#{msg:={F,A}},Pid) when is_list(F), is_list(A) ->
+    String = lists:flatten(io_lib:format(F,A)),
+    Pid ! {log,String},
+    String++"\n";
+format(#{msg:={string,String0}},Pid) ->
+    String = unicode:characters_to_list(String0),
+    Pid ! {log,String},
+    String++"\n".
+
+add_remove_instance_nofile(Type) ->
+    ok = logger:add_handler(?MODULE,logger_std_h,
+                            #{logger_std_h => #{type => Type},
+                              filter_default=>stop,
+                              filters=>?DEFAULT_HANDLER_FILTERS([?MODULE]),
+                              formatter=>{?MODULE,self()}}),
+    Pid = whereis(?MODULE),
+    true = is_pid(Pid),
+    group_leader(group_leader(),Pid), % to get printouts in test log
+    logger:info(M1=?msg,?domain),
+    ?check(M1),
+    %% check that filesync doesn't do damage even if not relevant
+    ok = logger_std_h:filesync(?MODULE),
+    ok = logger:remove_handler(?MODULE),
+    timer:sleep(500),
+    undefined = whereis(?MODULE),
+    logger:info(?msg,?domain),
+    ?check_no_log,
+    ok.
+
+logger_std_h_remove() ->
+    logger:remove_handler(?MODULE).
+logger_std_h_remove(Id) ->
+    logger:remove_handler(Id).
+
+try_read_file(FileName, Expected, Time) when Time > 0 ->
+    case file:read_file(FileName) of
+        Expected ->
+            ok;
+        Error = {error,_Reason} ->
+            ct:pal("Can't read ~tp: ~tp", [FileName,Error]),
+            erlang:error(Error);
+        Got ->
+            ct:pal("try_read_file got ~tp", [Got]),
+            timer:sleep(500),
+            try_read_file(FileName, Expected, Time-500)
+    end;
+try_read_file(FileName, Expected, _) ->
+    ct:pal("Missing pattern ~tp in ~tp", [Expected,FileName]),
+    erlang:error({error,missing_expected_pattern}).
+
+try_match_file(FileName, Pattern, Time) ->
+    try_match_file(FileName, Pattern, Time, <<>>).
+
+try_match_file(FileName, Pattern, Time, _) when Time > 0 ->
+    case file:read_file(FileName) of
+        {ok, Bin} ->
+            case re:run(Bin,Pattern,[{capture,none}]) of
+                match ->
+                    unicode:characters_to_list(Bin);
+                _ ->
+                    timer:sleep(100),
+                    try_match_file(FileName, Pattern, Time-100, Bin)
+            end;
+        Error ->
+            erlang:error(Error)
+    end;
+try_match_file(_,Pattern,_,Incorrect) ->
+    ct:pal("try_match_file did not match pattern: ~p~nGot: ~p~n",
+           [Pattern,Incorrect]),
+    erlang:error({error,not_matching_pattern,Pattern,Incorrect}).
+
+%%%-----------------------------------------------------------------
+%%% 
+start_op_trace() ->
+    TraceFun = fun({trace,_,call,{_Mod,Func,Details}}, Pid) ->
+                       Pid ! {trace_call,Func,Details},
+                       Pid;
+                  ({trace,_,return_from,{_Mod,Func,_},RetVal}, Pid) ->
+                       Pid ! {trace_return,Func,RetVal},
+                       Pid
+               end,
+    TRecvPid = spawn_link(fun() -> trace_receiver(5000) end),
+    {ok,_} = dbg:tracer(process, {TraceFun, TRecvPid}),
+
+    {ok,_} = dbg:p(whereis(?MODULE), [c]),
+    {ok,_} = dbg:p(self(), [c]),
+
+    MS1 = dbg:fun2ms(fun([_]) -> return_trace() end),
+    {ok,_} = dbg:tp(logger_h_common, check_load, 1, MS1),
+
+    {ok,_} = dbg:tpl(logger_h_common, flush_log_requests, 2, []),
+
+    MS2 = dbg:fun2ms(fun([_,mode]) -> return_trace() end),
+    {ok,_} = dbg:tpl(ets, lookup, 2, MS2),
+
+    ct:pal("Tracing started!", []),
+    TRecvPid.
+    
+stop_op_trace(TRecvPid) ->
+    dbg:stop_clear(),
+    unlink(TRecvPid),
+    exit(TRecvPid, kill),
+    ok.
+
+find_mode(flush, Events) ->
+    lists:any(fun({trace_call,flush_log_requests,[_,_]}) -> true;
+                 (_) -> false
+              end, Events);
+find_mode(Mode, Events) ->
+    lists:keymember([{mode,Mode}], 3, Events).
+
+find_switch(From, To, Events) ->
+    try lists:foldl(fun({trace_return,check_load,{To,_,_,_}},
+                        {trace_call,check_load,[#{mode := From}]}) ->
+                            throw(match);
+                       (Event, _) ->
+                            Event
+                    end, undefined, Events) of
+        _ -> false
+    catch
+        throw:match -> true
+    end.
+
+analyse_trace(TRecvPid, TestFun) ->
+    TRecvPid ! {test,self(),TestFun},
+    receive
+        {result,TRecvPid,Result} ->
+            Result
+    after
+        60000 ->
+            fails
+    end.
+
+trace_receiver(IdleT) ->
+    Msgs = receive_until_idle(IdleT, 5, []),
+    ct:pal("~w trace events generated", [length(Msgs)]),
+    analyse(Msgs).
+
+receive_until_idle(IdleT, WaitN, Msgs) ->
+    receive
+        Msg = {trace_call,_,_} ->
+            receive_until_idle(IdleT, 5, [Msg | Msgs]);
+        Msg = {trace_return,_,_} ->
+            receive_until_idle(IdleT, 5, [Msg | Msgs])
+    after
+        IdleT ->
+            if WaitN == 0 ->
+                    Msgs;
+               true ->
+                    receive_until_idle(IdleT, WaitN-1, Msgs)
+            end
+    end.
+          
+analyse(Msgs) ->
+    receive
+        {test,From,TestFun} ->
+            From ! {result,self(),TestFun(Msgs)},
+            analyse(Msgs)
+    end.