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<?xml version="1.0" encoding="utf8" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">
<chapter>
<header>
<copyright>
<year>2016</year><year>2016</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>LTTng and Erlang/OTP</title>
<prepared></prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date>2016-04-27</date>
<rev></rev>
<file>LTTng.xml</file>
</header>
<section>
<title>Introduction</title>
<p>The Linux Trace Toolkit: next generation is an open source system software package
for correlated tracing of the Linux kernel, user applications and libraries. </p>
<p>For more information, please visit <url href="http://lttng.org">http://lttng.org</url></p>
</section>
<section>
<title>Building Erlang/OTP with LTTng support</title>
<p>
Configure and build Erlang with LTTng support:
</p>
<p>For LTTng to work properly with Erlang/OTP you need
the following packages installed:</p>
<list type="bulleted">
<item><p>LTTng-tools: a command line interface to control tracing sessions.</p></item>
<item><p>LTTng-UST: user space tracing library.</p></item>
</list>
<p>On Ubuntu this can be installed via <c>aptitude</c>:</p>
<code type="none">$ sudo aptitude install lttng-tools liblttng-ust-dev</code>
<p>See <url href="http://lttng.org/docs/#doc-installing-lttng">Installing LTTng</url>
for more information on how to install LTTng on your system.</p>
<p>After LTTng is properly installed on the system Erlang/OTP can be built with LTTng support.</p>
<code type="none">$ ./configure --with-dynamic-trace=lttng
$ make </code>
</section>
<section>
<title>Dyntrace Tracepoints</title>
<p>All tracepoints are in the domain of <c>com_ericsson_dyntrace</c></p>
<p>All Erlang types are the string equivalent in LTTng.</p>
<p><em>process_spawn</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>parent : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>entry : string</c> :: Code Location. Ex. <c>"lists:sort/1"</c></item>
</list>
<p>Example:</p>
<p><code type="none">process_spawn: { cpu_id = 3 }, { pid = "<0.131.0>", parent = "<0.130.0>", entry = "erlang:apply/2" }</code></p>
<p><em>process_link</em></p>
<list type="bulleted">
<item><c>to : string</c> :: Process ID or Port ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>from : string</c> :: Process ID or Port ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>type : string</c> :: <c>"link" | "unlink"</c></item>
</list>
<p>Example:</p>
<p><code type="none">process_link: { cpu_id = 3 }, { from = "<0.130.0>", to = "<0.131.0>", type = "link" }</code></p>
<p><em>process_exit</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>reason : string</c> :: Exit reason. Ex. <c>"normal"</c></item>
</list>
<p>Example:</p>
<p><code type="none">process_exit: { cpu_id = 3 }, { pid = "<0.130.0>", reason = "normal" }</code></p>
<p><em>process_register</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>name : string</c> :: Registered name. Ex. <c>"error_logger"</c></item>
<item><c>type : string</c> :: <c>"register" | "unregister"</c></item>
</list>
<p>Example:</p>
<p><code type="none">process_register: { cpu_id = 0 }, { pid = "<0.128.0>", name = "dyntrace_lttng_SUITE" type = "register" }</code></p>
<p><em>process_scheduled</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>entry : string</c> :: Code Location. Ex. <c>"lists:sort/1"</c></item>
<item><c>type : string</c> :: <c>"in" | "out" | "in_exiting" | "out_exiting" | "out_exited"</c></item>
</list>
<p>Example:</p>
<p><code type="none">process_scheduled: { cpu_id = 0 }, { pid = "<0.136.0>", entry = "erlang:apply/2", type = "in" }</code></p>
<p><em>port_open</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>driver : string</c> :: Driver name. Ex. <c>"efile"</c></item>
<item><c>port : string</c> :: Port ID. Ex. <c>"#Port<0.1031>"</c></item>
</list>
<p>Example:</p>
<p><code type="none">port_open: { cpu_id = 5 }, { pid = "<0.131.0>", driver = "'/bin/sh -s unix:cmd'", port = "#Port<0.1887>" }</code></p>
<p><em>port_exit</em></p>
<list type="bulleted">
<item><c>port : string</c> :: Port ID. Ex. <c>"#Port<0.1031>"</c></item>
<item><c>reason : string</c> :: Exit reason. Ex. <c>"normal"</c></item>
</list>
<p>Example:</p>
<p><code type="none">port_exit: { cpu_id = 5 }, { port = "#Port<0.1887>", reason = "normal" }</code></p>
<p><em>port_link</em></p>
<list type="bulleted">
<item><c>to : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>from : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>type : string</c> :: <c>"link" | "unlink"</c></item>
</list>
<p>Example:</p>
<p><code type="none">port_link: { cpu_id = 5 }, { from = "#Port<0.1887>", to = "<0.131.0>", type = "unlink" }</code></p>
<p><em>port_scheduled</em></p>
<list type="bulleted">
<item><c>port : string</c> :: Port ID. Ex. <c>"#Port<0.1031>"</c></item>
<item><c>entry : string</c> :: Callback. Ex. <c>"open"</c></item>
<item><c>type : string</c> :: <c>"in" | "out" | "in_exiting" | "out_exiting" | "out_exited"</c></item>
</list>
<p>Example:</p>
<p><code type="none">port_scheduled: { cpu_id = 5 }, { pid = "#Port<0.1905>", entry = "close", type = "out" }</code></p>
<p><em>function_call</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>entry : string</c> :: Code Location. Ex. <c>"lists:sort/1"</c></item>
<item><c>depth : integer</c> :: Stack depth. Ex. <c>0</c></item>
</list>
<p>Example:</p>
<p><code type="none">function_call: { cpu_id = 5 }, { pid = "<0.145.0>", entry = "dyntrace_lttng_SUITE:'-t_call/1-fun-1-'/0", depth = 0 }</code></p>
<p><em>function_return</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>entry : string</c> :: Code Location. Ex. <c>"lists:sort/1"</c></item>
<item><c>depth : integer</c> :: Stack depth. Ex. <c>0</c></item>
</list>
<p>Example:</p>
<p><code type="none">function_return: { cpu_id = 5 }, { pid = "<0.145.0>", entry = "dyntrace_lttng_SUITE:waiter/0", depth = 0 }</code></p>
<p><em>function_exception</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>entry : string</c> :: Code Location. Ex. <c>"lists:sort/1"</c></item>
<item><c>class : string</c> :: Error reason. Ex. <c>"error"</c></item>
</list>
<p>Example:</p>
<p><code type="none">function_exception: { cpu_id = 5 }, { pid = "<0.144.0>", entry = "t:call_exc/1", class = "error" }</code></p>
<p><em>message_send</em></p>
<list type="bulleted">
<item><c>from : string</c> :: Process ID or Port ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>to : string</c> :: Process ID or Port ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>message : string</c> :: Message sent. Ex. <c>"{<0.162.0>,ok}"</c></item>
</list>
<p>Example:</p>
<p><code type="none">message_send: { cpu_id = 3 }, { from = "#Port<0.1938>", to = "<0.160.0>", message = "{#Port<0.1938>,eof}" }</code></p>
<p><em>message_receive</em></p>
<list type="bulleted">
<item><c>to : string</c> :: Process ID or Port ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>message : string</c> :: Message received. Ex. <c>"{<0.162.0>,ok}"</c></item>
</list>
<p>Example:</p>
<p><code type="none">message_receive: { cpu_id = 7 }, { to = "<0.167.0>", message = "{<0.165.0>,ok}" }</code></p>
<p><em>gc_minor_start</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>need : integer</c> :: Heap need. Ex. <c>2</c></item>
<item><c>heap : integer</c> :: Young heap word size. Ex. <c>233</c></item>
<item><c>old_heap : integer</c> :: Old heap word size. Ex. <c>233</c></item>
</list>
<p>Example:</p>
<p><code type="none">gc_minor_start: { cpu_id = 0 }, { pid = "<0.172.0>", need = 0, heap = 610, old_heap = 0 }</code></p>
<p><em>gc_minor_end</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>reclaimed : integer</c> :: Heap reclaimed. Ex. <c>2</c></item>
<item><c>heap : integer</c> :: Young heap word size. Ex. <c>233</c></item>
<item><c>old_heap : integer</c> :: Old heap word size. Ex. <c>233</c></item>
</list>
<p>Example:</p>
<p><code type="none">gc_minor_end: { cpu_id = 0 }, { pid = "<0.172.0>", reclaimed = 120, heap = 1598, old_heap = 1598 }</code></p>
<p><em>gc_major_start</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>need : integer</c> :: Heap need. Ex. <c>2</c></item>
<item><c>heap : integer</c> :: Young heap word size. Ex. <c>233</c></item>
<item><c>old_heap : integer</c> :: Old heap word size. Ex. <c>233</c></item>
</list>
<p>Example:</p>
<p><code type="none">gc_major_start: { cpu_id = 0 }, { pid = "<0.172.0>", need = 8, heap = 2586, old_heap = 1598 }</code></p>
<p><em>gc_major_end</em></p>
<list type="bulleted">
<item><c>pid : string</c> :: Process ID. Ex. <c>"<0.131.0>"</c></item>
<item><c>reclaimed : integer</c> :: Heap reclaimed. Ex. <c>2</c></item>
<item><c>heap : integer</c> :: Young heap word size. Ex. <c>233</c></item>
<item><c>old_heap : integer</c> :: Old heap word size. Ex. <c>233</c></item>
</list>
<p>Example:</p>
<p><code type="none">gc_major_end: { cpu_id = 0 }, { pid = "<0.172.0>", reclaimed = 240, heap = 4185, old_heap = 0 }</code></p>
</section>
<section>
<title>Examples</title>
</section>
</chapter>
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