On Wed, 17 Oct 2012, Dave Jones wrote:

 > Sounds good.  Is it possible to verify that policy_cache isn't getting 
 > larger than normal in /proc/slabinfo, i.e. when all processes with a 
 > task mempolicy or shared vma policy have exited, are there still a 
 > significant number of active objects?

Killing the fuzzer caused it to drop dramatically.

Before:
(15:29:59:davej@bitcrush:trinity[master])$ sudo cat /proc/slabinfo  | grep policy
shared_policy_node   2931   2967    376   43    4 : tunables    0    0    0 : slabdata     69     69      0
numa_policy         2971   6545    464   35    4 : tunables    0    0    0 : slabdata    187    187      0

After:
(15:30:16:davej@bitcrush:trinity[master])$ sudo cat /proc/slabinfo  | grep policy
shared_policy_node      0    215    376   43    4 : tunables    0    0    0 : slabdata      5      5      0
numa_policy           15    175    464   35    4 : tunables    0    0    0 : slabdata      5      5      0

Excellent, thanks.  This shows that the refcounting is working properly 
and we're not leaking any references as a result of this change causing 
the mempolicies to never be freed.  ("numa_policy" turns out to be 
policy_cache in the code, so thanks for checking both of them.)

Could I add your tested-by?

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