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Add extent_destroy_t and use it during arena destruction.

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Add the extent_destroy_t extent destruction hook to extent_hooks_t, and
use it during arena destruction.  This hook explicitly communicates to
the callee that the extent must be destroyed or tracked for later reuse,
lest it be permanently leaked.  Prior to this change, retained extents
could unintentionally be leaked if extent retention was enabled.

This resolves #560.
This commit is contained in:
Jason Evans
2017-04-27 15:51:35 -07:00
parent b9ab04a191
commit c86c8f4ffb
10 changed files with 120 additions and 17 deletions
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20
doc/jemalloc.xml.in
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@@ -1605,6 +1605,7 @@ typedef extent_hooks_s extent_hooks_t;
struct extent_hooks_s {
extent_alloc_t *alloc;
extent_dalloc_t *dalloc;
extent_destroy_t *destroy;
extent_commit_t *commit;
extent_decommit_t *decommit;
extent_purge_t *purge_lazy;
@@ -1681,6 +1682,25 @@ struct extent_hooks_s {
remains mapped, in the same commit state, and available for future use,
in which case it will be automatically retained for later reuse.</para>
<funcsynopsis><funcprototype>
<funcdef>typedef void <function>(extent_destroy_t)</function></funcdef>
<paramdef>extent_hooks_t *<parameter>extent_hooks</parameter></paramdef>
<paramdef>void *<parameter>addr</parameter></paramdef>
<paramdef>size_t <parameter>size</parameter></paramdef>
<paramdef>bool <parameter>committed</parameter></paramdef>
<paramdef>unsigned <parameter>arena_ind</parameter></paramdef>
</funcprototype></funcsynopsis>
<literallayout></literallayout>
<para>
An extent destruction function conforms to the
<type>extent_destroy_t</type> type and unconditionally destroys an
extent at given <parameter>addr</parameter> and
<parameter>size</parameter> with
<parameter>committed</parameter>/decommited memory as indicated, on
behalf of arena <parameter>arena_ind</parameter>. This function may be
called to destroy retained extents during arena destruction (see <link
linkend="arena.i.destroy"><mallctl>arena.&lt;i&gt;.destroy</mallctl></link>).</para>
<funcsynopsis><funcprototype>
<funcdef>typedef bool <function>(extent_commit_t)</function></funcdef>
<paramdef>extent_hooks_t *<parameter>extent_hooks</parameter></paramdef>