Merge branch 'maint-r15' into maint

Conflicts:
	erts/vsn.mk

2 files changed, 89 insertions, 0 deletions

diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index cfbc38f176..72cbf1f3b2 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -766,6 +766,16 @@
 	       <seealso marker="erlang#system_info_scheduler_bindings">erlang:system_info(scheduler_bindings)</seealso>.
 	    </p>
           </item>
+	  <tag><marker id="+sbwt"><c>+sbwt none|very_short|short|medium|long|very_long</c></marker></tag>
+	  <item>
+             <p>Set scheduler busy wait threshold. Default is <c>medium</c>.
+	        The threshold determines how long schedulers should busy
+		wait when running out of work before going to sleep.
+	     </p>
+             <p><em>NOTE:</em> This flag may be removed or changed at any time
+	        without prior notice.
+	     </p>
+	  </item>
           <tag><marker id="+scl"><c>+scl true|false</c></marker></tag>
           <item>
 	    <p>Enable or disable scheduler compaction of load. By default
@@ -901,6 +911,17 @@
 	    <p>For more information, see
 	    <seealso marker="erlang#system_info_cpu_topology">erlang:system_info(cpu_topology)</seealso>.</p>
           </item>
+	  <tag><marker id="+sws"><c>+sws default|legacy|proposal</c></marker></tag>
+	  <item>
+             <p>Set scheduler wakeup strategy. Default is <c>legacy</c> (has been
+	        used since OTP-R13B). The <c>proposal</c> strategy is the currently
+		proposed strategy for OTP-R16. Note that the <c>proposal</c> strategy
+		might change during OTP-R15.
+	     </p>
+             <p><em>NOTE:</em> This flag may be removed or changed at any time
+	        without prior notice.
+	     </p>
+	  </item>
 	  <tag><marker id="+swt"><c>+swt very_low|low|medium|high|very_high</c></marker></tag>
 	  <item>
              <p>Set scheduler wakeup threshold. Default is <c>medium</c>.
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
index 028a2bbf3d..6b6a3374d1 100644
--- a/erts/doc/src/notes.xml
+++ b/erts/doc/src/notes.xml
@@ -30,6 +30,74 @@
   </header>
   <p>This document describes the changes made to the ERTS application.</p>
 
+<section><title>Erts 5.9.1.1</title>
+
+    <section><title>Fixed Bugs and Malfunctions</title>
+      <list>
+        <item>
+          <p>
+	    If threads support for the runtime system had been
+	    disabled at compile time (<c>--disable-threads</c> had
+	    been passed to <c>configure</c>), and the <c>+A</c>
+	    command line argument of <c>erl</c> was passed when
+	    starting the runtime system, <seealso
+	    marker="erl_driver#driver_system_info">driver_system_info()</seealso>
+	    erroneously claimed that the runtime system had async
+	    threads even though it had not.</p>
+          <p>
+	    Due to this bug the file driver did not split tasks into
+	    smaller chunks, but instead completed the whole task at
+	    once, i.e., the scheduler got occupied with I/O for a
+	    longer time than intended.</p>
+          <p>
+	    Own Id: OTP-10059</p>
+        </item>
+      </list>
+    </section>
+
+
+    <section><title>Improvements and New Features</title>
+      <list>
+        <item>
+          <p>
+	    A proposal for a new scheduler wakeup strategy has been
+	    implemented. For more information see the documentation
+	    of the <seealso marker="erl#+sws">+sws</seealso> command
+	    line argument of <c>erl</c>.</p>
+          <p>
+	    Own Id: OTP-10033 Aux Id: Seq12025 </p>
+        </item>
+        <item>
+          <p>
+	    A switch for configuration of busy wait length for
+	    scheduler threads has been added. For more information
+	    see the documentation of the <seealso
+	    marker="erl#+sbwt">+sbwt</seealso> command line argument
+	    of <c>erl</c>.</p>
+          <p>
+	    Own Id: OTP-10044 Aux Id: Seq11976 </p>
+        </item>
+        <item>
+          <p>
+	    The extra memory barriers introduced by bug-fix OTP-9281
+	    were unnecessarily used also on tables without the
+	    <c>write_concurrency</c> option enabled. This could
+	    unnecessarily degrade performance of ETS tables without
+	    <c>write_concurrency</c> on some hardware (e.g. PowerPC)
+	    while not effecting performance at all on other hardware
+	    (e.g. x86/x86_64).</p>
+          <p>
+	    OTP-9281 (R14B03): ETS tables using the
+	    <c>write_concurrency</c> option could potentially get
+	    into an internally inconsistent state.</p>
+          <p>
+	    Own Id: OTP-10048 Aux Id: OTP-9281 </p>
+        </item>
+      </list>
+    </section>
+
+</section>
+
 <section><title>Erts 5.9.1</title>
 
     <section><title>Fixed Bugs and Malfunctions</title>