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authorJohannes Weiner <jweiner@redhat.com>2011-08-25 15:59:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-25 16:25:33 -0700
commit5af12d0efdbd9967cc71a0a10c4025c4255a6254 (patch)
treee5e036671dc7ae02bebaf201126d6c19104e02d1 /scripts
parenta801876638c5ce650223476c4eb8f37cea32dc1c (diff)
memcg: pin execution to current cpu while draining stock
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>
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