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Remove ratio-based purging.

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Make decay-based purging the default (and only) mode.

Remove associated mallctls:
- opt.purge
- opt.lg_dirty_mult
- arena.<i>.lg_dirty_mult
- arenas.lg_dirty_mult
- stats.arenas.<i>.lg_dirty_mult

This resolves #385.
This commit is contained in:
Jason Evans
2016-10-12 10:40:27 -07:00
parent b4b4a77848
commit 63b5657aa5
11 changed files with 38 additions and 485 deletions
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76
doc/jemalloc.xml.in
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@@ -924,42 +924,6 @@ for (i = 0; i < nbins; i++) {
number of CPUs, or one if there is a single CPU.</para></listitem>
</varlistentry>
<varlistentry id="opt.purge">
<term>
<mallctl>opt.purge</mallctl>
(<type>const char *</type>)
<literal>r-</literal>
</term>
<listitem><para>Purge mode is &ldquo;ratio&rdquo; (default) or
&ldquo;decay&rdquo;. See <link
linkend="opt.lg_dirty_mult"><mallctl>opt.lg_dirty_mult</mallctl></link>
for details of the ratio mode. See <link
linkend="opt.decay_time"><mallctl>opt.decay_time</mallctl></link> for
details of the decay mode.</para></listitem>
</varlistentry>
<varlistentry id="opt.lg_dirty_mult">
<term>
<mallctl>opt.lg_dirty_mult</mallctl>
(<type>ssize_t</type>)
<literal>r-</literal>
</term>
<listitem><para>Per-arena minimum ratio (log base 2) of active to dirty
pages. Some dirty unused pages may be allowed to accumulate, within
the limit set by the ratio (or one chunk worth of dirty pages,
whichever is greater), before informing the kernel about some of those
pages via <citerefentry><refentrytitle>madvise</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> or a similar system call. This
provides the kernel with sufficient information to recycle dirty pages
if physical memory becomes scarce and the pages remain unused. The
default minimum ratio is 8:1 (2^3:1); an option value of -1 will
disable dirty page purging. See <link
linkend="arenas.lg_dirty_mult"><mallctl>arenas.lg_dirty_mult</mallctl></link>
and <link
linkend="arena.i.lg_dirty_mult"><mallctl>arena.&lt;i&gt;.lg_dirty_mult</mallctl></link>
for related dynamic control options.</para></listitem>
</varlistentry>
<varlistentry id="opt.decay_time">
<term>
<mallctl>opt.decay_time</mallctl>
@@ -1518,20 +1482,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
settings.</para></listitem>
</varlistentry>
<varlistentry id="arena.i.lg_dirty_mult">
<term>
<mallctl>arena.&lt;i&gt;.lg_dirty_mult</mallctl>
(<type>ssize_t</type>)
<literal>rw</literal>
</term>
<listitem><para>Current per-arena minimum ratio (log base 2) of active
to dirty pages for arena &lt;i&gt;. Each time this interface is set and
the ratio is increased, pages are synchronously purged as necessary to
impose the new ratio. See <link
linkend="opt.lg_dirty_mult"><mallctl>opt.lg_dirty_mult</mallctl></link>
for additional information.</para></listitem>
</varlistentry>
<varlistentry id="arena.i.decay_time">
<term>
<mallctl>arena.&lt;i&gt;.decay_time</mallctl>
@@ -1778,20 +1728,6 @@ struct extent_hooks_s {
initialized.</para></listitem>
</varlistentry>
<varlistentry id="arenas.lg_dirty_mult">
<term>
<mallctl>arenas.lg_dirty_mult</mallctl>
(<type>ssize_t</type>)
<literal>rw</literal>
</term>
<listitem><para>Current default per-arena minimum ratio (log base 2) of
active to dirty pages, used to initialize <link
linkend="arena.i.lg_dirty_mult"><mallctl>arena.&lt;i&gt;.lg_dirty_mult</mallctl></link>
during arena creation. See <link
linkend="opt.lg_dirty_mult"><mallctl>opt.lg_dirty_mult</mallctl></link>
for additional information.</para></listitem>
</varlistentry>
<varlistentry id="arenas.decay_time">
<term>
<mallctl>arenas.decay_time</mallctl>
@@ -2137,18 +2073,6 @@ struct extent_hooks_s {
</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.lg_dirty_mult">
<term>
<mallctl>stats.arenas.&lt;i&gt;.lg_dirty_mult</mallctl>
(<type>ssize_t</type>)
<literal>r-</literal>
</term>
<listitem><para>Minimum ratio (log base 2) of active to dirty pages.
See <link
linkend="opt.lg_dirty_mult"><mallctl>opt.lg_dirty_mult</mallctl></link>
for details.</para></listitem>
</varlistentry>
<varlistentry id="stats.arenas.i.decay_time">
<term>
<mallctl>stats.arenas.&lt;i&gt;.decay_time</mallctl>