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memcg: pin execution to current cpu while draining stock 

Commit d1a05b6973 ("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>
This commit is contained in:
Johannes Weiner 2011-08-25 15:59:07 -07:00 committed by Linus Torvalds
parent a801876638
commit 5af12d0efd
1 changed files with 2 additions and 7 deletions
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9
mm/memcontrol.c
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@ -2169,13 +2169,7 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync)
/* Notify other cpus that system-wide "drain" is running */
get_online_cpus();
/*
* Get a hint for avoiding draining charges on the current cpu,
* which must be exhausted by our charging. It is not required that
* this be a precise check, so we use raw_smp_processor_id() instead of
* getcpu()/putcpu().
*/
curcpu = raw_smp_processor_id();
curcpu = get_cpu();
for_each_online_cpu(cpu) {
struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
struct mem_cgroup *mem;
@ -2192,6 +2186,7 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync)
schedule_work_on(cpu, &stock->work);
}
}
put_cpu();
if (!sync)
goto out;