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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 2016-10-31 22:30:49 -07:00
parent b93f63b3eb
commit 0ba5b9b618
2 changed files with 754 additions and 351 deletions
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44
doc/jemalloc.xml.in
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@ -410,28 +410,28 @@ for (i = 0; i < nbins; i++) {
/* Do something with bin_size... */
}]]></programlisting></para>
<para>The <function>malloc_stats_print()</function> function
writes human-readable summary statistics via the
<parameter>write_cb</parameter> callback function pointer and
<parameter>cbopaque</parameter> data passed to
<parameter>write_cb</parameter>, or
<function>malloc_message()</function> if
<parameter>write_cb</parameter> is <constant>NULL</constant>. This
function can be called repeatedly. General information that never changes
during execution can be omitted by specifying "g" as a character within
the <parameter>opts</parameter> string. Note that
<function>malloc_message()</function> uses the
<function>mallctl*()</function> functions internally, so
inconsistent statistics can be reported if multiple threads use these
functions simultaneously. If <option>--enable-stats</option> is specified
during configuration, &ldquo;m&rdquo; and &ldquo;a&rdquo; can be specified
to omit merged arena and per arena statistics, respectively;
&ldquo;b&rdquo; and &ldquo;l&rdquo; can be specified to omit per size
class statistics for bins and large objects, respectively. Unrecognized
characters are silently ignored. Note that thread caching may prevent
some statistics from being completely up to date, since extra locking
would be required to merge counters that track thread cache
operations.</para>
<para>The <function>malloc_stats_print()</function> function writes
summary statistics via the <parameter>write_cb</parameter> callback
function pointer and <parameter>cbopaque</parameter> data passed to
<parameter>write_cb</parameter>, or <function>malloc_message()</function>
if <parameter>write_cb</parameter> is <constant>NULL</constant>. The
statistics are presented in human-readable form unless "J" is specified as
a character within the <parameter>opts</parameter> string, in which case
the statistics are presented in <ulink 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 "g" as a character within the <parameter>opts</parameter>
string. Note that <function>malloc_message()</function> uses the
<function>mallctl*()</function> functions internally, so inconsistent
statistics can be reported if multiple threads use these functions
simultaneously. If <option>--enable-stats</option> is specified during
configuration, &ldquo;m&rdquo; and &ldquo;a&rdquo; can be specified to
omit merged arena and per arena statistics, respectively; &ldquo;b&rdquo;
and &ldquo;l&rdquo; can be specified to omit per size class statistics for
bins and large objects, respectively. Unrecognized characters are
silently ignored. Note that thread caching may prevent some statistics
from being completely up to date, since extra locking would be required to
merge counters that track thread cache operations.</para>
<para>The <function>malloc_usable_size()</function> function
returns the usable size of the allocation pointed to by

1061
src/stats.c
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