linux-kernel - [PATCH 1/3] memcg: fix account leak at failure of memsw acconting.

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Date:	Tue, 25 Jan 2011 15:00:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	stable@...nel.org
Subject: [PATCH 1/3] memcg: fix account leak at failure of memsw acconting.

This is required for 2.6.36-stable and later.
==
Commit 4b53433468c87794b523e4683fbd4e8e8aca1f63 removes
a cancel of charge at case: 
memory charge-> success.
mem+swap charge-> failure.

This leaks usage of memory. Fix it.

This patch is required for stable tree since 2.6.36.

CC: stable@...nel.org
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.38-rc2/mm/memcontrol.c
===================================================================
--- linux-2.6.38-rc2.orig/mm/memcontrol.c
+++ linux-2.6.38-rc2/mm/memcontrol.c
@@ -1832,6 +1832,7 @@ static int __mem_cgroup_do_charge(struct
 		if (likely(!ret))
 			return CHARGE_OK;
 
+		res_counter_uncharge(&mem->res, csize);
 		mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw);
 		flags |= MEM_CGROUP_RECLAIM_NOSWAP;
 	} else

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