Mallctl: Add arenas.lookup

Implement a new mallctl operation that allows looking up the arena a region of memory belongs to.
2018-05-01 12:31:09 -06:00
parent 6df90600a7
commit a32b7bd567
3 changed files with 59 additions and 1 deletions
--- a/doc/jemalloc.xml.in
+++ b/doc/jemalloc.xml.in
@@ -2130,6 +2130,15 @@ struct extent_hooks_s {
        and return the new arena index.</para></listitem>
      </varlistentry>

+      <varlistentry id="arenas.lookup">
+        <term>
+          <mallctl>arenas.lookup</mallctl>
+          (<type>unsigned</type>, <type>void*</type>)
+          <literal>rw</literal>
+        </term>
+        <listitem><para>Index of the arena to which an allocation belongs to.</para></listitem>
+      </varlistentry>
+
      <varlistentry id="prof.thread_active_init">
        <term>
          <mallctl>prof.thread_active_init</mallctl>