https://github.com/torvalds/linux
Revision 5af12d0efdbd9967cc71a0a10c4025c4255a6254 authored by Johannes Weiner on 25 August 2011, 22:59:07 UTC, committed by Linus Torvalds on 25 August 2011, 23:25:33 UTC
Commit d1a05b6973c7 ("memcg do not try to drain per-cpu caches without
pages") added a drain_local_stock() call to a preemptible section.

The draining task looks up the cpu-local stock twice to set the
draining-flag, then to drain the stock and clear the flag again.  If the
task is migrated to a different CPU in between, noone will clear the
flag on the first stock and it will be forever undrainable.  Its charge
can not be recovered and the cgroup can not be deleted anymore.

Properly pin the task to the executing CPU while draining stocks.

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent a801876
History
Tip revision: 5af12d0efdbd9967cc71a0a10c4025c4255a6254 authored by Johannes Weiner on 25 August 2011, 22:59:07 UTC
memcg: pin execution to current cpu while draining stock
Tip revision: 5af12d0
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