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Add thread.peak.[read|reset] mallctls.

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These can be used to track net allocator activity on a per-thread basis.
This commit is contained in:
David Goldblatt
2020-05-27 14:31:00 -07:00
committed by David Goldblatt
parent fe7108305a
commit d82a164d0d
13 changed files with 269 additions and 5 deletions
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36
doc/jemalloc.xml.in
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@@ -1621,6 +1621,42 @@ malloc_conf = "xmalloc:true";]]></programlisting>
should not be modified by the application.</para></listitem>
</varlistentry>
<varlistentry id="thread.peak.read">
<term>
<mallctl>thread.peak.read</mallctl>
(<type>uint64_t</type>)
<literal>r-</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Get an approximation of the maximum value of the
difference between the number of bytes allocated and the number of bytes
deallocated by the calling thread since the last call to <link
linkend="thread.peak.reset"><mallctl>thread.peak.reset</mallctl></link>,
or since the thread's creation if it has not called <link
linkend="thread.peak.reset"><mallctl>thread.peak.reset</mallctl></link>.
No guarantees are made about the quality of the approximation, but
jemalloc currently endeavors to maintain accuracy to within one hundred
kilobytes.
</para></listitem>
</varlistentry>
<varlistentry id="thread.peak.reset">
<term>
<mallctl>thread.peak.reset</mallctl>
(<type>void</type>)
<literal>--</literal>
[<option>--enable-stats</option>]
</term>
<listitem><para>Resets the counter for net bytes allocated in the calling
thread to zero. This affects subsequent calls to <link
linkend="thread.peak.read"><mallctl>thread.peak.read</mallctl></link>,
but not the values returned by <link
linkend="thread.allocated"><mallctl>thread.allocated</mallctl></link>
or <link
linkend="thread.deallocated"><mallctl>thread.deallocated</mallctl></link>.
</para></listitem>
</varlistentry>
<varlistentry id="thread.tcache.enabled">
<term>
<mallctl>thread.tcache.enabled</mallctl>