linux-kernel - [PATCH 2/2] memcg: fix reclaim result checks.

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Date:	Fri, 21 Nov 2008 19:03:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	pbadari@...ibm.com, jblunck@...e.de, taka@...inux.co.jp,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	npiggin@...e.de
Subject: [PATCH 2/2] memcg: fix reclaim result checks.

check_under_limit logic was wrong and this check should be against
mem_over_limit rather than mem.

Reported-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

Index: mmotm-2.6.28-Nov20/mm/memcontrol.c
===================================================================
--- mmotm-2.6.28-Nov20.orig/mm/memcontrol.c
+++ mmotm-2.6.28-Nov20/mm/memcontrol.c
@@ -714,17 +714,17 @@ static int __mem_cgroup_try_charge(struc
 		 * current usage of the cgroup before giving up
 		 *
 		 */
-		if (!do_swap_account &&
-			res_counter_check_under_limit(&mem->res))
-			continue;
-		if (do_swap_account &&
-			res_counter_check_under_limit(&mem->memsw))
-			continue;
+		if (do_swap_account) {
+			if (res_counter_check_under_limit(&mem_over_limit->res) &&
+			    res_counter_check_under_limit(&mem_over_limit->memsw))
+				continue;
+		} else if (res_counter_check_under_limit(&mem_over_limit->res))
+				continue;
 
 		if (!nr_retries--) {
 			if (oom) {
-				mem_cgroup_out_of_memory(mem, gfp_mask);
-				mem->last_oom_jiffies = jiffies;
+				mem_cgroup_out_of_memory(mem_over_limit, gfp_mask);
+				mem_over_limit->last_oom_jiffies = jiffies;
 			}
 			goto nomem;
 		}

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