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Add "J" (JSON) support to malloc_stats_print().

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This resolves #474.
This commit is contained in:
Jason Evans 2016-11-01 15:28:54 -07:00
parent 4752a54eeb
commit b599b32280
2 changed files with 894 additions and 416 deletions
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43
doc/jemalloc.xml.in
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@ -410,29 +410,30 @@ for (i = 0; i < nbins; i++) {
/* Do something with bin_size... */ /* Do something with bin_size... */
}]]></programlisting></para> }]]></programlisting></para>
<para>The <function>malloc_stats_print()</function> function <para>The <function>malloc_stats_print()</function> function writes
writes human-readable summary statistics via the summary statistics via the <parameter>write_cb</parameter> callback
<parameter>write_cb</parameter> callback function pointer and function pointer and <parameter>cbopaque</parameter> data passed to
<parameter>cbopaque</parameter> data passed to <parameter>write_cb</parameter>, or <function>malloc_message()</function>
<parameter>write_cb</parameter>, or if <parameter>write_cb</parameter> is <constant>NULL</constant>. The
<function>malloc_message()</function> if statistics are presented in human-readable form unless <quote>J</quote> is
<parameter>write_cb</parameter> is <constant>NULL</constant>. This specified as a character within the <parameter>opts</parameter> string, in
function can be called repeatedly. General information that never which case the statistics are presented in <ulink
changes during execution can be omitted by specifying "g" as a character url="http://www.json.org/">JSON format</ulink>. This function can be
called repeatedly. General information that never changes during
execution can be omitted by specifying <quote>g</quote> as a character
within the <parameter>opts</parameter> string. Note that within the <parameter>opts</parameter> string. Note that
<function>malloc_message()</function> uses the <function>malloc_message()</function> uses the
<function>mallctl*()</function> functions internally, so <function>mallctl*()</function> functions internally, so inconsistent
inconsistent statistics can be reported if multiple threads use these statistics can be reported if multiple threads use these functions
functions simultaneously. If <option>--enable-stats</option> is simultaneously. If <option>--enable-stats</option> is specified during
specified during configuration, &ldquo;m&rdquo; and &ldquo;a&rdquo; can configuration, <quote>m</quote> and <quote>a</quote> can be specified to
be specified to omit merged arena and per arena statistics, respectively; omit merged arena and per arena statistics, respectively;
&ldquo;b&rdquo;, &ldquo;l&rdquo;, and &ldquo;h&rdquo; can be specified to <quote>b</quote>, <quote>l</quote>, and <quote>h</quote> can be specified
omit per size class statistics for bins, large objects, and huge objects, to omit per size class statistics for bins, large objects, and huge
respectively. Unrecognized characters are silently ignored. Note that objects, respectively. Unrecognized characters are silently ignored.
thread caching may prevent some statistics from being completely up to Note that thread caching may prevent some statistics from being completely
date, since extra locking would be required to merge counters that track up to date, since extra locking would be required to merge counters that
thread cache operations. track thread cache operations.</para>
</para>
<para>The <function>malloc_usable_size()</function> function <para>The <function>malloc_usable_size()</function> function
returns the usable size of the allocation pointed to by returns the usable size of the allocation pointed to by

1267
src/stats.c
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