From 5af12d0efdbd9967cc71a0a10c4025c4255a6254 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Thu, 25 Aug 2011 15:59:07 -0700 Subject: [PATCH] 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 Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-format-patch failed