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cgroup: make sure memcg margin is 0 when over limit 

For the memcg sock code, we'll need to register allocations
that are temporarily over limit. Let's make sure that margin
is 0 in this case.

I am keeping this as a separate patch, so that if any weirdness
interaction appears in the future, we can now exactly what caused
it.

Suggested by Johannes Weiner

Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Johannes Weiner <hannes@cmpxchg.org>
CC: Michal Hocko <mhocko@suse.cz>
CC: Tejun Heo <tj@kernel.org>
CC: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Glauber Costa 2012-01-20 04:57:15 +00:00 committed by David S. Miller
parent 376be5ff8a
commit 8cfd14ad1e
1 changed files with 4 additions and 1 deletions
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5
include/linux/res_counter.h
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@ -142,7 +142,10 @@ static inline unsigned long long res_counter_margin(struct res_counter *cnt)
unsigned long flags;
spin_lock_irqsave(&cnt->lock, flags);
margin = cnt->limit - cnt->usage;
if (cnt->limit > cnt->usage)
margin = cnt->limit - cnt->usage;
else
margin = 0;
spin_unlock_irqrestore(&cnt->lock, flags);
return margin;
}