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Remove --disable-tcache.

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Simplify configuration by removing the --disable-tcache option, but
replace the testing for that configuration with
--with-malloc-conf=tcache:false.

Fix the thread.arena and thread.tcache.flush mallctls to work correctly
if tcache is disabled.

This partially resolves #580.
This commit is contained in:
Jason Evans
2017-04-20 17:21:37 -07:00
parent 5aa46f027d
commit 4403c9ab44
25 changed files with 188 additions and 412 deletions
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34
doc/jemalloc.xml.in
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@@ -510,13 +510,12 @@ for (i = 0; i < nbins; i++) {
sense to reduce the number of arenas if an application does not make much
use of the allocation functions.</para>
<para>In addition to multiple arenas, unless
<option>--disable-tcache</option> is specified during configuration, this
allocator supports thread-specific caching, in order to make it possible to
completely avoid synchronization for most allocation requests. Such caching
allows very fast allocation in the common case, but it increases memory
usage and fragmentation, since a bounded number of objects can remain
allocated in each thread cache.</para>
<para>In addition to multiple arenas, this allocator supports
thread-specific caching, in order to make it possible to completely avoid
synchronization for most allocation requests. Such caching allows very fast
allocation in the common case, but it increases memory usage and
fragmentation, since a bounded number of objects can remain allocated in
each thread cache.</para>
<para>Memory is conceptually broken into extents. Extents are always
aligned to multiples of the page size. This alignment makes it possible to
@@ -839,16 +838,6 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.tcache">
<term>
<mallctl>config.tcache</mallctl>
(<type>bool</type>)
<literal>r-</literal>
</term>
<listitem><para><option>--disable-tcache</option> was not specified
during build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.tls">
<term>
<mallctl>config.tls</mallctl>
@@ -1095,7 +1084,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>opt.tcache</mallctl>
(<type>bool</type>)
<literal>r-</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Thread-specific caching (tcache) enabled/disabled. When
there are multiple threads, each thread uses a tcache for objects up to
@@ -1112,7 +1100,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>opt.lg_tcache_max</mallctl>
(<type>size_t</type>)
<literal>r-</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Maximum size class (log base 2) to cache in the
thread-specific cache (tcache). At a minimum, all small size classes
@@ -1370,7 +1357,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>thread.tcache.enabled</mallctl>
(<type>bool</type>)
<literal>rw</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Enable/disable calling thread's tcache. The tcache is
implicitly flushed as a side effect of becoming
@@ -1384,7 +1370,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>thread.tcache.flush</mallctl>
(<type>void</type>)
<literal>--</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Flush calling thread's thread-specific cache (tcache).
This interface releases all cached objects and internal data structures
@@ -1440,7 +1425,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>tcache.create</mallctl>
(<type>unsigned</type>)
<literal>r-</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Create an explicit thread-specific cache (tcache) and
return an identifier that can be passed to the <link
@@ -1457,7 +1441,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>tcache.flush</mallctl>
(<type>unsigned</type>)
<literal>-w</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Flush the specified thread-specific cache (tcache). The
same considerations apply to this interface as to <link
@@ -1471,7 +1454,6 @@ malloc_conf = "xmalloc:true";]]></programlisting>
<mallctl>tcache.destroy</mallctl>
(<type>unsigned</type>)
<literal>-w</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Flush the specified thread-specific cache (tcache) and
make the identifier available for use during a future tcache creation.
@@ -1873,7 +1855,6 @@ struct extent_hooks_s {
<mallctl>arenas.tcache_max</mallctl>
(<type>size_t</type>)
<literal>r-</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Maximum thread-cached size class.</para></listitem>
</varlistentry>
@@ -1892,7 +1873,6 @@ struct extent_hooks_s {
<mallctl>arenas.nhbins</mallctl>
(<type>unsigned</type>)
<literal>r-</literal>
[<option>--enable-tcache</option>]
</term>
<listitem><para>Total number of thread cache bin size
classes.</para></listitem>
@@ -2575,7 +2555,6 @@ struct extent_hooks_s {
<mallctl>stats.arenas.&lt;i&gt;.bins.&lt;j&gt;.nfills</mallctl>
(<type>uint64_t</type>)
<literal>r-</literal>
[<option>--enable-stats</option> <option>--enable-tcache</option>]
</term>
<listitem><para>Cumulative number of tcache fills.</para></listitem>
</varlistentry>
@@ -2585,7 +2564,6 @@ struct extent_hooks_s {
<mallctl>stats.arenas.&lt;i&gt;.bins.&lt;j&gt;.nflushes</mallctl>
(<type>uint64_t</type>)
<literal>r-</literal>
[<option>--enable-stats</option> <option>--enable-tcache</option>]
</term>
<listitem><para>Cumulative number of tcache flushes.</para></listitem>
</varlistentry>