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Added documentation for mutex profiling related mallctls.

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Qi Wang 2017-03-22 16:59:14 -07:00 committed by Qi Wang
parent 362e356675
commit bbc16a50f9
1 changed files with 206 additions and 0 deletions
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doc/jemalloc.xml.in
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@ -2153,6 +2153,80 @@ struct extent_hooks_s {
</para></listitem> </para></listitem>
</varlistentry> </varlistentry>
<varlistentry id="stats.mutexes.ctl">
<term>
<mallctl>stats.mutexes.ctl.{counter};</mallctl>
(<type>counter specific type</type>)
<literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>ctl</varname> mutex (global
scope; mallctl related). <mallctl>{counter}</mallctl> is one of the
counters below:</para>
<varlistentry id="mutex_counters">
<listitem><para><varname>num_ops</varname> (<type>uint64_t</type>):
Total number of lock acquisition operations on this mutex.</para>
<para><varname>num_spin_acq</varname> (<type>uint64_t</type>): Number
of times the mutex was spin-acquired. When the mutex is currently
locked and cannot be acquired immediately, a short period of
spin-retry within jemalloc will be performed. Acquired through spin
generally means the contention was lightweight and not causing context
switches.</para>
<para><varname>num_wait</varname> (<type>uint64_t</type>): Number of
times the mutex was wait-acquired, which means the mutex contention
was not solved by spin-retry, and blocking operation was likely
involved in order to acquire the mutex. This event generally implies
higher cost / longer delay, and should be investigated if it happens
often.</para>
<para><varname>max_wait_time</varname> (<type>uint64_t</type>):
Maximum length of time in nanoseconds spent on a single wait-acquired
lock operation. Note that to avoid profiling overhead on the common
path, this does not consider spin-acquired cases.</para>
<para><varname>total_wait_time</varname> (<type>uint64_t</type>):
Cumulative time in nanoseconds spent on wait-acquired lock operations.
Similarly, spin-acquired cases are not considered.</para>
<para><varname>max_num_thds</varname> (<type>uint32_t</type>): Maximum
number of threads waiting on this mutex simultaneously. Similarly,
spin-acquired cases are not considered.</para>
<para><varname>num_owner_switch</varname> (<type>uint64_t</type>):
Number of times the current mutex owner is different from the previous
one. This event does not generally imply an issue; rather it is an
indicator of how often the protected data are accessed by different
threads.
</para>
</listitem>
</varlistentry>
</listitem>
</varlistentry>
<varlistentry id="stats.mutexes.prof">
<term>
<mallctl>stats.mutexes.prof.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>prof</varname> mutex (global
scope; profiling related). <mallctl>{counter}</mallctl> is one of the
counters in <link linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.mutexes.reset">
<term>
<mallctl>stats.mutexes.reset</mallctl>
(<type>void</type>) <literal>--</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Reset all mutex profile statistics, including global
mutexes, arena mutexes and bin mutexes.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.dss"> <varlistentry id="stats.arenas.i.dss">
<term> <term>
<mallctl>stats.arenas.&lt;i&gt;.dss</mallctl> <mallctl>stats.arenas.&lt;i&gt;.dss</mallctl>
@ -2547,6 +2621,19 @@ struct extent_hooks_s {
<listitem><para>Current number of slabs.</para></listitem> <listitem><para>Current number of slabs.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry id="stats.arenas.i.bins.mutex">
<term>
<mallctl>stats.arenas.&lt;i&gt;.bins.&lt;j&gt;.mutex.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on
<varname>arena.&lt;i&gt;.bins.&lt;j&gt;</varname> mutex (arena bin
scope; bin operation related). <mallctl>{counter}</mallctl> is one of
the counters in <link linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.lextents.j.nmalloc"> <varlistentry id="stats.arenas.i.lextents.j.nmalloc">
<term> <term>
<mallctl>stats.arenas.&lt;i&gt;.lextents.&lt;j&gt;.nmalloc</mallctl> <mallctl>stats.arenas.&lt;i&gt;.lextents.&lt;j&gt;.nmalloc</mallctl>
@ -2590,6 +2677,125 @@ struct extent_hooks_s {
<listitem><para>Current number of large allocations for this size class. <listitem><para>Current number of large allocations for this size class.
</para></listitem> </para></listitem>
</varlistentry> </varlistentry>
<varlistentry id="stats.arenas.i.mutexes.large">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.large.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.large</varname>
mutex (arena scope; large allocation related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.extent_freelist">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.extent_freelist.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.extent_freelist
</varname> mutex (arena scope; extent freelist related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.extents_dirty">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.extents_dirty.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.extents_dirty
</varname> mutex (arena scope; dirty extents related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.extents_muzzy">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.extents_muzzy.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.extents_muzzy
</varname> mutex (arena scope; muzzy extents related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.extents_retained">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.extents_retained.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.extents_retained
</varname> mutex (arena scope; retained extents related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.decay_dirty">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.decay_dirty.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.decay_dirty
</varname> mutex (arena scope; decay for dirty pages related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.decay_muzzy">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.decay_muzzy.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.decay_muzzy
</varname> mutex (arena scope; decay for muzzy pages related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.base">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.base.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on <varname>arena.&lt;i&gt;.base</varname>
mutex (arena scope; base allocator related).
<mallctl>{counter}</mallctl> is one of the counters in <link
linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.mutexes.tcache_list">
<term>
<mallctl>stats.arenas.&lt;i&gt;.mutexes.tcache_list.{counter}</mallctl>
(<type>counter specific type</type>) <literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Statistics on
<varname>arena.&lt;i&gt;.tcache_list</varname> mutex (arena scope;
tcache to arena association related). This mutex is expected to be
accessed less often. <mallctl>{counter}</mallctl> is one of the
counters in <link linkend="mutex_counters">mutex profiling
counters</link>.</para></listitem>
</varlistentry>
</variablelist> </variablelist>
</refsect1> </refsect1>
<refsect1 id="heap_profile_format"> <refsect1 id="heap_profile_format">