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Document opt.oversize_threshold.

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Qi Wang 2019-03-28 20:30:56 -07:00 committed by Qi Wang
parent 788a657cee
commit ce03e4c7b8
1 changed files with 25 additions and 3 deletions
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doc/jemalloc.xml.in
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@ -992,6 +992,24 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
number of CPUs, or one if there is a single CPU.</para></listitem> number of CPUs, or one if there is a single CPU.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry id="opt.oversize_threshold">
<term>
<mallctl>opt.oversize_threshold</mallctl>
(<type>size_t</type>)
<literal>r-</literal>
</term>
<listitem><para>The threshold in bytes of which requests are considered
oversize. Allocation requests with greater sizes are fulfilled from a
dedicated arena (automatically managed, however not within
<literal>narenas</literal>), in order to reduce fragmentation by not
mixing huge allocations with small ones. In addition, the reserved
special arena may have its own default decay settings. Note that
requests with arena index specified via
<constant>MALLOCX_ARENA</constant>, or threads associated with explicit
arenas will not be considered. The default threshold is 8MiB. Values
not within large size classes disables this feature.</para></listitem>
</varlistentry>
<varlistentry id="opt.percpu_arena"> <varlistentry id="opt.percpu_arena">
<term> <term>
<mallctl>opt.percpu_arena</mallctl> <mallctl>opt.percpu_arena</mallctl>
@ -1013,7 +1031,7 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
<varlistentry id="opt.background_thread"> <varlistentry id="opt.background_thread">
<term> <term>
<mallctl>opt.background_thread</mallctl> <mallctl>opt.background_thread</mallctl>
(<type>const bool</type>) (<type>bool</type>)
<literal>r-</literal> <literal>r-</literal>
</term> </term>
<listitem><para>Internal background worker threads enabled/disabled. <listitem><para>Internal background worker threads enabled/disabled.
@ -1028,7 +1046,7 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
<varlistentry id="opt.max_background_threads"> <varlistentry id="opt.max_background_threads">
<term> <term>
<mallctl>opt.max_background_threads</mallctl> <mallctl>opt.max_background_threads</mallctl>
(<type>const size_t</type>) (<type>size_t</type>)
<literal>r-</literal> <literal>r-</literal>
</term> </term>
<listitem><para>Maximum number of background threads that will be created <listitem><para>Maximum number of background threads that will be created
@ -1059,7 +1077,11 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
linkend="arena.i.dirty_decay_ms"><mallctl>arena.&lt;i&gt;.dirty_decay_ms</mallctl></link> linkend="arena.i.dirty_decay_ms"><mallctl>arena.&lt;i&gt;.dirty_decay_ms</mallctl></link>
for related dynamic control options. See <link for related dynamic control options. See <link
linkend="opt.muzzy_decay_ms"><mallctl>opt.muzzy_decay_ms</mallctl></link> linkend="opt.muzzy_decay_ms"><mallctl>opt.muzzy_decay_ms</mallctl></link>
for a description of muzzy pages.</para></listitem> for a description of muzzy pages.for a description of muzzy pages. Note
that when the <link
linkend="opt.oversize_threshold"><mallctl>oversize_threshold</mallctl></link>
feature is enabled, the arenas reserved for oversize requests may have
its own default decay settings.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry id="opt.muzzy_decay_ms"> <varlistentry id="opt.muzzy_decay_ms">