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Add arena.i.retain_grow_limit

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This option controls the max size when grow_retained.  This is useful when we
have customized extent hooks reserving physical memory (e.g. 1G huge pages).
Without this feature, the default increasing sequence could result in fragmented
and wasted physical memory.
This commit is contained in:
Qi Wang 2017-11-02 17:48:39 -07:00 • committed by Qi Wang
parent 9f455e2786
commit e422fa8e7e
8 changed files with 146 additions and 5 deletions
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16
doc/jemalloc.xml.in
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@ -1683,6 +1683,22 @@ malloc_conf = "xmalloc:true";]]></programlisting>
for additional information.</para></listitem>
</varlistentry>
<varlistentry id="arena.i.retain_grow_limit">
<term>
<mallctl>arena.&lt;i&gt;.retain_grow_limit</mallctl>
(<type>size_t</type>)
<literal>rw</literal>
</term>
<listitem><para>Maximum size to grow retained region (only relevant when
<link linkend="opt.retain"><mallctl>opt.retain</mallctl></link> is
enabled). This controls the maximum increment to expand virtual memory,
or allocation through <link
linkend="arena.i.extent_hooks"><mallctl>arena.&lt;i&gt;extent_hooks</mallctl></link>.
In particular, if customized extent hooks reserve physical memory
(e.g. 1G huge pages), this is useful to control the allocation hook's
input size. The default is no limit.</para></listitem>
</varlistentry>
<varlistentry id="arena.i.extent_hooks">
<term>
<mallctl>arena.&lt;i&gt;.extent_hooks</mallctl>