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Make dss non-optional, and fix an "arena.<i>.dss" mallctl bug.

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Make dss non-optional on all platforms which support sbrk(2).

Fix the "arena.<i>.dss" mallctl to return an error if "primary" or
"secondary" precedence is specified, but sbrk(2) is not supported.
This commit is contained in:
Jason Evans
2014-04-15 12:09:48 -07:00
parent 644d414bc9
commit 4d434adb14
13 changed files with 72 additions and 73 deletions
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29
doc/jemalloc.xml.in
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@@ -448,8 +448,10 @@ for (i = 0; i < nbins; i++) {
<manvolnum>2</manvolnum></citerefentry> to obtain memory, which is
suboptimal for several reasons, including race conditions, increased
fragmentation, and artificial limitations on maximum usable memory. If
<option>--enable-dss</option> is specified during configuration, this
allocator uses both <citerefentry><refentrytitle>mmap</refentrytitle>
<citerefentry><refentrytitle>sbrk</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> is supported by the operating
system, this allocator uses both
<citerefentry><refentrytitle>mmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> and
<citerefentry><refentrytitle>sbrk</refentrytitle>
<manvolnum>2</manvolnum></citerefentry>, in that order of preference;
@@ -625,16 +627,6 @@ for (i = 0; i < nbins; i++) {
build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.dss">
<term>
<mallctl>config.dss</mallctl>
(<type>bool</type>)
<literal>r-</literal>
</term>
<listitem><para><option>--enable-dss</option> was specified during
build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.fill">
<term>
<mallctl>config.fill</mallctl>
@@ -790,10 +782,15 @@ for (i = 0; i < nbins; i++) {
<manvolnum>2</manvolnum></citerefentry>) allocation precedence as
related to <citerefentry><refentrytitle>mmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> allocation. The following
settings are supported: &ldquo;disabled&rdquo;, &ldquo;primary&rdquo;,
and &ldquo;secondary&rdquo;. The default is &ldquo;secondary&rdquo; if
<link linkend="config.dss"><mallctl>config.dss</mallctl></link> is
true, &ldquo;disabled&rdquo; otherwise.
settings are supported if
<citerefentry><refentrytitle>sbrk</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> is supported by the operating
system: &ldquo;disabled&rdquo;, &ldquo;primary&rdquo;, and
&ldquo;secondary&rdquo;; otherwise only &ldquo;disabled&rdquo; is
supported. The default is &ldquo;secondary&rdquo; if
<citerefentry><refentrytitle>sbrk</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> is supported by the operating
system; &ldquo;disabled&rdquo; otherwise.
</para></listitem>
</varlistentry>