diff options
Diffstat (limited to 'doc/jemalloc.xml.in')
| -rw-r--r-- | doc/jemalloc.xml.in | 460 |
1 files changed, 309 insertions, 151 deletions
diff --git a/doc/jemalloc.xml.in b/doc/jemalloc.xml.in index abd5e6fc..c7e2e872 100644 --- a/doc/jemalloc.xml.in +++ b/doc/jemalloc.xml.in @@ -33,11 +33,17 @@ <refname>aligned_alloc</refname> <refname>realloc</refname> <refname>free</refname> - <refname>malloc_usable_size</refname> - <refname>malloc_stats_print</refname> + <refname>mallocx</refname> + <refname>rallocx</refname> + <refname>xallocx</refname> + <refname>sallocx</refname> + <refname>dallocx</refname> + <refname>nallocx</refname> <refname>mallctl</refname> <refname>mallctlnametomib</refname> <refname>mallctlbymib</refname> + <refname>malloc_stats_print</refname> + <refname>malloc_usable_size</refname> <refname>allocm</refname> <refname>rallocm</refname> <refname>sallocm</refname> @@ -92,16 +98,37 @@ <refsect2> <title>Non-standard API</title> <funcprototype> - <funcdef>size_t <function>malloc_usable_size</function></funcdef> - <paramdef>const void *<parameter>ptr</parameter></paramdef> + <funcdef>void *<function>mallocx</function></funcdef> + <paramdef>size_t <parameter>size</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> </funcprototype> <funcprototype> - <funcdef>void <function>malloc_stats_print</function></funcdef> - <paramdef>void <parameter>(*write_cb)</parameter> - <funcparams>void *, const char *</funcparams> - </paramdef> - <paramdef>void *<parameter>cbopaque</parameter></paramdef> - <paramdef>const char *<parameter>opts</parameter></paramdef> + <funcdef>void *<function>rallocx</function></funcdef> + <paramdef>void *<parameter>ptr</parameter></paramdef> + <paramdef>size_t <parameter>size</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>size_t <function>xallocx</function></funcdef> + <paramdef>void *<parameter>ptr</parameter></paramdef> + <paramdef>size_t <parameter>size</parameter></paramdef> + <paramdef>size_t <parameter>extra</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>size_t <function>sallocx</function></funcdef> + <paramdef>void *<parameter>ptr</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>void <function>dallocx</function></funcdef> + <paramdef>void *<parameter>ptr</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>size_t <function>nallocx</function></funcdef> + <paramdef>size_t <parameter>size</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> </funcprototype> <funcprototype> <funcdef>int <function>mallctl</function></funcdef> @@ -127,6 +154,18 @@ <paramdef>size_t <parameter>newlen</parameter></paramdef> </funcprototype> <funcprototype> + <funcdef>void <function>malloc_stats_print</function></funcdef> + <paramdef>void <parameter>(*write_cb)</parameter> + <funcparams>void *, const char *</funcparams> + </paramdef> + <paramdef>void *<parameter>cbopaque</parameter></paramdef> + <paramdef>const char *<parameter>opts</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>size_t <function>malloc_usable_size</function></funcdef> + <paramdef>const void *<parameter>ptr</parameter></paramdef> + </funcprototype> + <funcprototype> <funcdef>void <function>(*malloc_message)</function></funcdef> <paramdef>void *<parameter>cbopaque</parameter></paramdef> <paramdef>const char *<parameter>s</parameter></paramdef> @@ -225,42 +264,103 @@ </refsect2> <refsect2> <title>Non-standard API</title> + <para>The <function>mallocx<parameter/></function>, + <function>rallocx<parameter/></function>, + <function>xallocx<parameter/></function>, + <function>sallocx<parameter/></function>, + <function>dallocx<parameter/></function>, and + <function>nallocx<parameter/></function> functions all have a + <parameter>flags</parameter> argument that can be used to specify + options. The functions only check the options that are contextually + relevant. Use bitwise or (<code language="C">|</code>) operations to + specify one or more of the following: + <variablelist> + <varlistentry> + <term><constant>MALLOCX_LG_ALIGN(<parameter>la</parameter>) + </constant></term> - <para>The <function>malloc_usable_size<parameter/></function> function - returns the usable size of the allocation pointed to by - <parameter>ptr</parameter>. The return value may be larger than the size - that was requested during allocation. The - <function>malloc_usable_size<parameter/></function> function is not a - mechanism for in-place <function>realloc<parameter/></function>; rather - it is provided solely as a tool for introspection purposes. Any - discrepancy between the requested allocation size and the size reported - by <function>malloc_usable_size<parameter/></function> should not be - depended on, since such behavior is entirely implementation-dependent. - </para> + <listitem><para>Align the memory allocation to start at an address + that is a multiple of <code language="C">(1 << + <parameter>la</parameter>)</code>. This macro does not validate + that <parameter>la</parameter> is within the valid + range.</para></listitem> + </varlistentry> + <varlistentry> + <term><constant>MALLOCX_ALIGN(<parameter>a</parameter>) + </constant></term> - <para>The <function>malloc_stats_print<parameter/></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<parameter/></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<parameter/></function> uses the - <function>mallctl*<parameter/></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, “m” and “a” can - be specified to omit merged arena and per arena statistics, respectively; - “b” and “l” 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. + <listitem><para>Align the memory allocation to start at an address + that is a multiple of <parameter>a</parameter>, where + <parameter>a</parameter> is a power of two. This macro does not + validate that <parameter>a</parameter> is a power of 2. + </para></listitem> + </varlistentry> + <varlistentry> + <term><constant>MALLOCX_ZERO</constant></term> + + <listitem><para>Initialize newly allocated memory to contain zero + bytes. In the growing reallocation case, the real size prior to + reallocation defines the boundary between untouched bytes and those + that are initialized to contain zero bytes. If this macro is + absent, newly allocated memory is uninitialized.</para></listitem> + </varlistentry> + <varlistentry> + <term><constant>MALLOCX_ARENA(<parameter>a</parameter>) + </constant></term> + + <listitem><para>Use the arena specified by the index + <parameter>a</parameter> (and by necessity bypass the thread + cache). This macro has no effect for huge regions, nor for regions + that were allocated via an arena other than the one specified. + This macro does not validate that <parameter>a</parameter> + specifies an arena index in the valid range.</para></listitem> + </varlistentry> + </variablelist> </para> + <para>The <function>mallocx<parameter/></function> function allocates at + least <parameter>size</parameter> bytes of memory, and returns a pointer + to the base address of the allocation. Behavior is undefined if + <parameter>size</parameter> is <constant>0</constant>, or if request size + overflows due to size class and/or alignment constraints.</para> + + <para>The <function>rallocx<parameter/></function> function resizes the + allocation at <parameter>ptr</parameter> to be at least + <parameter>size</parameter> bytes, and returns a pointer to the base + address of the resulting allocation, which may or may not have moved from + its original location. Behavior is undefined if + <parameter>size</parameter> is <constant>0</constant>, or if request size + overflows due to size class and/or alignment constraints.</para> + + <para>The <function>xallocx<parameter/></function> function resizes the + allocation at <parameter>ptr</parameter> in place to be at least + <parameter>size</parameter> bytes, and returns the real size of the + allocation. If <parameter>extra</parameter> is non-zero, an attempt is + made to resize the allocation to be at least <code + language="C">(<parameter>size</parameter> + + <parameter>extra</parameter>)</code> bytes, though inability to allocate + the extra byte(s) will not by itself result in failure to resize. + Behavior is undefined if <parameter>size</parameter> is + <constant>0</constant>, or if <code + language="C">(<parameter>size</parameter> + <parameter>extra</parameter> + > <constant>SIZE_T_MAX</constant>)</code>.</para> + + <para>The <function>sallocx<parameter/></function> function returns the + real size of the allocation at <parameter>ptr</parameter>.</para> + + <para>The <function>dallocx<parameter/></function> function causes the + memory referenced by <parameter>ptr</parameter> to be made available for + future allocations.</para> + + <para>The <function>nallocx<parameter/></function> function allocates no + memory, but it performs the same size computation as the + <function>mallocx<parameter/></function> function, and returns the real + size of the allocation that would result from the equivalent + <function>mallocx<parameter/></function> function call. Behavior is + undefined if <parameter>size</parameter> is <constant>0</constant>, or if + request size overflows due to size class and/or alignment + constraints.</para> + <para>The <function>mallctl<parameter/></function> function provides a general interface for introspecting the memory allocator, as well as setting modifiable parameters and triggering actions. The @@ -297,15 +397,14 @@ it is legitimate to construct code like the following: <programlisting language="C"><![CDATA[ unsigned nbins, i; - -int mib[4]; +size_t mib[4]; size_t len, miblen; len = sizeof(nbins); mallctl("arenas.nbins", &nbins, &len, NULL, 0); miblen = 4; -mallnametomib("arenas.bin.0.size", mib, &miblen); +mallctlnametomib("arenas.bin.0.size", mib, &miblen); for (i = 0; i < nbins; i++) { size_t bin_size; @@ -314,6 +413,41 @@ for (i = 0; i < nbins; i++) { mallctlbymib(mib, miblen, &bin_size, &len, NULL, 0); /* Do something with bin_size... */ }]]></programlisting></para> + + <para>The <function>malloc_stats_print<parameter/></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<parameter/></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<parameter/></function> uses the + <function>mallctl*<parameter/></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, “m” and “a” can + be specified to omit merged arena and per arena statistics, respectively; + “b” and “l” 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<parameter/></function> function + returns the usable size of the allocation pointed to by + <parameter>ptr</parameter>. The return value may be larger than the size + that was requested during allocation. The + <function>malloc_usable_size<parameter/></function> function is not a + mechanism for in-place <function>realloc<parameter/></function>; rather + it is provided solely as a tool for introspection purposes. Any + discrepancy between the requested allocation size and the size reported + by <function>malloc_usable_size<parameter/></function> should not be + depended on, since such behavior is entirely implementation-dependent. + </para> </refsect2> <refsect2> <title>Experimental API</title> @@ -358,7 +492,7 @@ for (i = 0; i < nbins; i++) { <listitem><para>Initialize newly allocated memory to contain zero bytes. In the growing reallocation case, the real size prior to reallocation defines the boundary between untouched bytes and those - that are initialized to contain zero bytes. If this option is + that are initialized to contain zero bytes. If this macro is absent, newly allocated memory is uninitialized.</para></listitem> </varlistentry> <varlistentry> @@ -373,9 +507,11 @@ for (i = 0; i < nbins; i++) { </constant></term> <listitem><para>Use the arena specified by the index - <parameter>a</parameter>. This macro does not validate that - <parameter>a</parameter> specifies an arena in the valid - range.</para></listitem> + <parameter>a</parameter> (and by necessity bypass the thread + cache). This macro has no effect for huge regions, nor for regions + that were allocated via an arena other than the one specified. + This macro does not validate that <parameter>a</parameter> + specifies an arena index in the valid range.</para></listitem> </varlistentry> </variablelist> </para> @@ -385,8 +521,9 @@ for (i = 0; i < nbins; i++) { <parameter>*ptr</parameter> to the base address of the allocation, and sets <parameter>*rsize</parameter> to the real size of the allocation if <parameter>rsize</parameter> is not <constant>NULL</constant>. Behavior - is undefined if <parameter>size</parameter> is - <constant>0</constant>.</para> + is undefined if <parameter>size</parameter> is <constant>0</constant>, or + if request size overflows due to size class and/or alignment + constraints.</para> <para>The <function>rallocm<parameter/></function> function resizes the allocation at <parameter>*ptr</parameter> to be at least @@ -396,11 +533,12 @@ for (i = 0; i < nbins; i++) { <parameter>rsize</parameter> is not <constant>NULL</constant>. If <parameter>extra</parameter> is non-zero, an attempt is made to resize the allocation to be at least <code - language="C"><parameter>size</parameter> + + language="C">(<parameter>size</parameter> + <parameter>extra</parameter>)</code> bytes, though inability to allocate the extra byte(s) will not by itself result in failure. Behavior is - undefined if <parameter>size</parameter> is <constant>0</constant>, or if - <code language="C">(<parameter>size</parameter> + + undefined if <parameter>size</parameter> is <constant>0</constant>, if + request size overflows due to size class and/or alignment constraints, or + if <code language="C">(<parameter>size</parameter> + <parameter>extra</parameter> > <constant>SIZE_T_MAX</constant>)</code>.</para> @@ -417,8 +555,9 @@ for (i = 0; i < nbins; i++) { <parameter>rsize</parameter> is not <constant>NULL</constant> it sets <parameter>*rsize</parameter> to the real size of the allocation that would result from the equivalent <function>allocm<parameter/></function> - function call. Behavior is undefined if - <parameter>size</parameter> is <constant>0</constant>.</para> + function call. Behavior is undefined if <parameter>size</parameter> is + <constant>0</constant>, or if request size overflows due to size class + and/or alignment constraints.</para> </refsect2> </refsect1> <refsect1 id="tuning"> @@ -605,7 +744,7 @@ for (i = 0; i < nbins; i++) { which controls refreshing of cached dynamic statistics.</para> <variablelist> - <varlistentry> + <varlistentry id="version"> <term> <mallctl>version</mallctl> (<type>const char *</type>) @@ -626,7 +765,7 @@ for (i = 0; i < nbins; i++) { detecting whether another thread caused a refresh.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.debug"> <term> <mallctl>config.debug</mallctl> (<type>bool</type>) @@ -636,7 +775,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.dss"> <term> <mallctl>config.dss</mallctl> (<type>bool</type>) @@ -646,7 +785,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.fill"> <term> <mallctl>config.fill</mallctl> (<type>bool</type>) @@ -656,7 +795,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.lazy_lock"> <term> <mallctl>config.lazy_lock</mallctl> (<type>bool</type>) @@ -666,7 +805,7 @@ for (i = 0; i < nbins; i++) { during build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.mremap"> <term> <mallctl>config.mremap</mallctl> (<type>bool</type>) @@ -676,7 +815,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.munmap"> <term> <mallctl>config.munmap</mallctl> (<type>bool</type>) @@ -686,7 +825,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.prof"> <term> <mallctl>config.prof</mallctl> (<type>bool</type>) @@ -696,7 +835,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.prof_libgcc"> <term> <mallctl>config.prof_libgcc</mallctl> (<type>bool</type>) @@ -706,7 +845,7 @@ for (i = 0; i < nbins; i++) { specified during build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.prof_libunwind"> <term> <mallctl>config.prof_libunwind</mallctl> (<type>bool</type>) @@ -716,7 +855,7 @@ for (i = 0; i < nbins; i++) { during build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.stats"> <term> <mallctl>config.stats</mallctl> (<type>bool</type>) @@ -726,7 +865,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.tcache"> <term> <mallctl>config.tcache</mallctl> (<type>bool</type>) @@ -736,7 +875,7 @@ for (i = 0; i < nbins; i++) { during build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.tls"> <term> <mallctl>config.tls</mallctl> (<type>bool</type>) @@ -746,7 +885,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.utrace"> <term> <mallctl>config.utrace</mallctl> (<type>bool</type>) @@ -756,7 +895,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.valgrind"> <term> <mallctl>config.valgrind</mallctl> (<type>bool</type>) @@ -766,7 +905,7 @@ for (i = 0; i < nbins; i++) { build configuration.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="config.xmalloc"> <term> <mallctl>config.xmalloc</mallctl> (<type>bool</type>) @@ -791,19 +930,6 @@ for (i = 0; i < nbins; i++) { </para></listitem> </varlistentry> - <varlistentry id="opt.lg_chunk"> - <term> - <mallctl>opt.lg_chunk</mallctl> - (<type>size_t</type>) - <literal>r-</literal> - </term> - <listitem><para>Virtual memory chunk size (log base 2). If a chunk - size outside the supported size range is specified, the size is - silently clipped to the minimum/maximum supported size. The default - chunk size is 4 MiB (2^22). - </para></listitem> - </varlistentry> - <varlistentry id="opt.dss"> <term> <mallctl>opt.dss</mallctl> @@ -815,7 +941,23 @@ for (i = 0; i < nbins; i++) { related to <citerefentry><refentrytitle>mmap</refentrytitle> <manvolnum>2</manvolnum></citerefentry> allocation. The following settings are supported: “disabled”, “primary”, - and “secondary” (default).</para></listitem> + and “secondary”. The default is “secondary” if + <link linkend="config.dss"><mallctl>config.dss</mallctl></link> is + true, “disabled” otherwise. + </para></listitem> + </varlistentry> + + <varlistentry id="opt.lg_chunk"> + <term> + <mallctl>opt.lg_chunk</mallctl> + (<type>size_t</type>) + <literal>r-</literal> + </term> + <listitem><para>Virtual memory chunk size (log base 2). If a chunk + size outside the supported size range is specified, the size is + silently clipped to the minimum/maximum supported size. The default + chunk size is 4 MiB (2^22). + </para></listitem> </varlistentry> <varlistentry id="opt.narenas"> @@ -934,7 +1076,8 @@ for (i = 0; i < nbins; i++) { <listitem><para>Zero filling enabled/disabled. If enabled, each byte of uninitialized allocated memory will be initialized to 0. Note that this initialization only happens once for each byte, so - <function>realloc<parameter/></function> and + <function>realloc<parameter/></function>, + <function>rallocx<parameter/></function> and <function>rallocm<parameter/></function> calls do not zero memory that was previously allocated. This is intended for debugging and will impact performance negatively. This option is disabled by default. @@ -1063,7 +1206,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <term> <mallctl>opt.prof_active</mallctl> (<type>bool</type>) - <literal>r-</literal> + <literal>rw</literal> [<option>--enable-prof</option>] </term> <listitem><para>Profiling activated/deactivated. This is a secondary @@ -1175,7 +1318,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> by default.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="thread.arena"> <term> <mallctl>thread.arena</mallctl> (<type>unsigned</type>) @@ -1202,7 +1345,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> cases.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="thread.allocatedp"> <term> <mallctl>thread.allocatedp</mallctl> (<type>uint64_t *</type>) @@ -1229,7 +1372,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> cases.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="thread.deallocatedp"> <term> <mallctl>thread.deallocatedp</mallctl> (<type>uint64_t *</type>) @@ -1243,7 +1386,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <function>mallctl*<parameter/></function> calls.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="thread.tcache.enabled"> <term> <mallctl>thread.tcache.enabled</mallctl> (<type>bool</type>) @@ -1257,7 +1400,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="thread.tcache.flush"> <term> <mallctl>thread.tcache.flush</mallctl> (<type>void</type>) @@ -1323,7 +1466,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> initialized.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.quantum"> <term> <mallctl>arenas.quantum</mallctl> (<type>size_t</type>) @@ -1332,7 +1475,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Quantum size.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.page"> <term> <mallctl>arenas.page</mallctl> (<type>size_t</type>) @@ -1341,7 +1484,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Page size.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.tcache_max"> <term> <mallctl>arenas.tcache_max</mallctl> (<type>size_t</type>) @@ -1351,7 +1494,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Maximum thread-cached size class.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.nbins"> <term> <mallctl>arenas.nbins</mallctl> (<type>unsigned</type>) @@ -1360,7 +1503,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Number of bin size classes.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.nhbins"> <term> <mallctl>arenas.nhbins</mallctl> (<type>unsigned</type>) @@ -1380,7 +1523,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Maximum size supported by size class.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.bin.i.nregs"> <term> <mallctl>arenas.bin.<i>.nregs</mallctl> (<type>uint32_t</type>) @@ -1389,7 +1532,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Number of regions per page run.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.bin.i.run_size"> <term> <mallctl>arenas.bin.<i>.run_size</mallctl> (<type>size_t</type>) @@ -1398,7 +1541,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Number of bytes per page run.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.nlruns"> <term> <mallctl>arenas.nlruns</mallctl> (<type>size_t</type>) @@ -1407,7 +1550,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Total number of large size classes.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.lrun.i.size"> <term> <mallctl>arenas.lrun.<i>.size</mallctl> (<type>size_t</type>) @@ -1417,7 +1560,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> class.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.purge"> <term> <mallctl>arenas.purge</mallctl> (<type>unsigned</type>) @@ -1427,7 +1570,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> for all arenas if none is specified.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="arenas.extend"> <term> <mallctl>arenas.extend</mallctl> (<type>unsigned</type>) @@ -1451,7 +1594,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="prof.dump"> <term> <mallctl>prof.dump</mallctl> (<type>const char *</type>) @@ -1467,7 +1610,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> option.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="prof.interval"> <term> <mallctl>prof.interval</mallctl> (<type>uint64_t</type>) @@ -1527,7 +1670,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> entirely devoted to allocator metadata.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.mapped"> <term> <mallctl>stats.mapped</mallctl> (<type>size_t</type>) @@ -1541,7 +1684,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> does not include inactive chunks.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.chunks.current"> <term> <mallctl>stats.chunks.current</mallctl> (<type>size_t</type>) @@ -1553,7 +1696,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.chunks.total"> <term> <mallctl>stats.chunks.total</mallctl> (<type>uint64_t</type>) @@ -1563,7 +1706,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Cumulative number of chunks allocated.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.chunks.high"> <term> <mallctl>stats.chunks.high</mallctl> (<type>size_t</type>) @@ -1574,7 +1717,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.huge.allocated"> <term> <mallctl>stats.huge.allocated</mallctl> (<type>size_t</type>) @@ -1585,7 +1728,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.huge.nmalloc"> <term> <mallctl>stats.huge.nmalloc</mallctl> (<type>uint64_t</type>) @@ -1596,7 +1739,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.huge.ndalloc"> <term> <mallctl>stats.huge.ndalloc</mallctl> (<type>uint64_t</type>) @@ -1607,7 +1750,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.dss"> <term> <mallctl>stats.arenas.<i>.dss</mallctl> (<type>const char *</type>) @@ -1621,7 +1764,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.nthreads"> <term> <mallctl>stats.arenas.<i>.nthreads</mallctl> (<type>unsigned</type>) @@ -1631,7 +1774,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> arena.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.pactive"> <term> <mallctl>stats.arenas.<i>.pactive</mallctl> (<type>size_t</type>) @@ -1652,7 +1795,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> similar has not been called.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.mapped"> <term> <mallctl>stats.arenas.<i>.mapped</mallctl> (<type>size_t</type>) @@ -1662,7 +1805,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Number of mapped bytes.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.npurge"> <term> <mallctl>stats.arenas.<i>.npurge</mallctl> (<type>uint64_t</type>) @@ -1673,7 +1816,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.nmadvise"> <term> <mallctl>stats.arenas.<i>.nmadvise</mallctl> (<type>uint64_t</type>) @@ -1685,9 +1828,9 @@ malloc_conf = "xmalloc:true";]]></programlisting> similar calls made to purge dirty pages.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.purged"> <term> - <mallctl>stats.arenas.<i>.npurged</mallctl> + <mallctl>stats.arenas.<i>.purged</mallctl> (<type>uint64_t</type>) <literal>r-</literal> [<option>--enable-stats</option>] @@ -1695,7 +1838,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Number of pages purged.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.small.allocated"> <term> <mallctl>stats.arenas.<i>.small.allocated</mallctl> (<type>size_t</type>) @@ -1706,7 +1849,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.small.nmalloc"> <term> <mallctl>stats.arenas.<i>.small.nmalloc</mallctl> (<type>uint64_t</type>) @@ -1717,7 +1860,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> small bins.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.small.ndalloc"> <term> <mallctl>stats.arenas.<i>.small.ndalloc</mallctl> (<type>uint64_t</type>) @@ -1728,7 +1871,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.small.nrequests"> <term> <mallctl>stats.arenas.<i>.small.nrequests</mallctl> (<type>uint64_t</type>) @@ -1739,7 +1882,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.large.allocated"> <term> <mallctl>stats.arenas.<i>.large.allocated</mallctl> (<type>size_t</type>) @@ -1750,7 +1893,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.large.nmalloc"> <term> <mallctl>stats.arenas.<i>.large.nmalloc</mallctl> (<type>uint64_t</type>) @@ -1761,7 +1904,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> directly by the arena.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.large.ndalloc"> <term> <mallctl>stats.arenas.<i>.large.ndalloc</mallctl> (<type>uint64_t</type>) @@ -1772,7 +1915,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> directly by the arena.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.large.nrequests"> <term> <mallctl>stats.arenas.<i>.large.nrequests</mallctl> (<type>uint64_t</type>) @@ -1783,7 +1926,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.allocated"> <term> <mallctl>stats.arenas.<i>.bins.<j>.allocated</mallctl> (<type>size_t</type>) @@ -1794,7 +1937,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> bin.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nmalloc"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nmalloc</mallctl> (<type>uint64_t</type>) @@ -1805,7 +1948,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.ndalloc"> <term> <mallctl>stats.arenas.<i>.bins.<j>.ndalloc</mallctl> (<type>uint64_t</type>) @@ -1816,7 +1959,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> </para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nrequests"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nrequests</mallctl> (<type>uint64_t</type>) @@ -1827,7 +1970,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> requests.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nfills"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nfills</mallctl> (<type>uint64_t</type>) @@ -1837,7 +1980,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Cumulative number of tcache fills.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nflushes"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nflushes</mallctl> (<type>uint64_t</type>) @@ -1847,7 +1990,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Cumulative number of tcache flushes.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nruns"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nruns</mallctl> (<type>uint64_t</type>) @@ -1857,7 +2000,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Cumulative number of runs created.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.nreruns"> <term> <mallctl>stats.arenas.<i>.bins.<j>.nreruns</mallctl> (<type>uint64_t</type>) @@ -1868,7 +2011,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> to allocate changed.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.bins.j.curruns"> <term> <mallctl>stats.arenas.<i>.bins.<j>.curruns</mallctl> (<type>size_t</type>) @@ -1878,7 +2021,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> <listitem><para>Current number of runs.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.lruns.j.nmalloc"> <term> <mallctl>stats.arenas.<i>.lruns.<j>.nmalloc</mallctl> (<type>uint64_t</type>) @@ -1889,7 +2032,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> class served directly by the arena.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.lruns.j.ndalloc"> <term> <mallctl>stats.arenas.<i>.lruns.<j>.ndalloc</mallctl> (<type>uint64_t</type>) @@ -1900,7 +2043,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> size class served directly by the arena.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.lruns.j.nrequests"> <term> <mallctl>stats.arenas.<i>.lruns.<j>.nrequests</mallctl> (<type>uint64_t</type>) @@ -1911,7 +2054,7 @@ malloc_conf = "xmalloc:true";]]></programlisting> class.</para></listitem> </varlistentry> - <varlistentry> + <varlistentry id="stats.arenas.i.lruns.j.curruns"> <term> <mallctl>stats.arenas.<i>.lruns.<j>.curruns</mallctl> (<type>size_t</type>) @@ -2037,9 +2180,26 @@ malloc_conf = "xmalloc:true";]]></programlisting> </refsect2> <refsect2> <title>Non-standard API</title> - <para>The <function>malloc_usable_size<parameter/></function> function - returns the usable size of the allocation pointed to by - <parameter>ptr</parameter>. </para> + <para>The <function>mallocx<parameter/></function> and + <function>rallocx<parameter/></function> functions return a pointer to + the allocated memory if successful; otherwise a <constant>NULL</constant> + pointer is returned to indicate insufficient contiguous memory was + available to service the allocation request. </para> + + <para>The <function>xallocx<parameter/></function> function returns the + real size of the resulting resized allocation pointed to by + <parameter>ptr</parameter>, which is a value less than + <parameter>size</parameter> if the allocation could not be adequately + grown in place. </para> + + <para>The <function>sallocx<parameter/></function> function returns the + real size of the allocation pointed to by <parameter>ptr</parameter>. + </para> + + <para>The <function>nallocx<parameter/></function> returns the real size + that would result from a successful equivalent + <function>mallocx<parameter/></function> function call, or zero if + insufficient memory is available to perform the size computation. </para> <para>The <function>mallctl<parameter/></function>, <function>mallctlnametomib<parameter/></function>, and @@ -2057,12 +2217,6 @@ malloc_conf = "xmalloc:true";]]></programlisting> are read despite the error.</para></listitem> </varlistentry> <varlistentry> - <term><errorname>ENOMEM</errorname></term> - - <listitem><para><parameter>*oldlenp</parameter> is too short to - hold the requested value.</para></listitem> - </varlistentry> - <varlistentry> <term><errorname>ENOENT</errorname></term> <listitem><para><parameter>name</parameter> or @@ -2090,6 +2244,10 @@ malloc_conf = "xmalloc:true";]]></programlisting> </varlistentry> </variablelist> </para> + + <para>The <function>malloc_usable_size<parameter/></function> function + returns the usable size of the allocation pointed to by + <parameter>ptr</parameter>. </para> </refsect2> <refsect2> <title>Experimental API</title> |