linux-kernel - [PATCH] mmotm: memcgvmscan-do-not-break-out-targeted-reclaim-without-reclaimed-pages.patch fix

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Date:	Tue, 29 Jan 2013 09:51:04 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Tejun Heo <htejun@...il.com>,
	Glauber Costa <glommer@...allels.com>, linux-mm@...ck.org,
	Li Zefan <lizefan@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] mmotm:
 memcgvmscan-do-not-break-out-targeted-reclaim-without-reclaimed-pages.patch
 fix

Ying has noticed me (via private email) that the patch is bogus because
the break out condition is incorrect. She said she would post a fix
but she's been probably too busy. If she doesn't oppose, could you add
the follow up fix, please?

I am really sorry about this mess.
---
>From 6d23b59e96b8173fae2d0d397cb5e99f16899874 Mon Sep 17 00:00:00 2001
From: Ying Han <yinghan@...gle.com>
Date: Tue, 29 Jan 2013 09:42:28 +0100
Subject: [PATCH] mmotm:
 memcgvmscan-do-not-break-out-targeted-reclaim-without-reclaimed-pages.patch
 fix

We should break out of the hierarchy loop only if nr_reclaimed exceeded
nr_to_reclaim and not vice-versa. This patch fixes the condition.

Signed-off-by: Ying Han <yinghan@...gle.com>
---
 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d75c1ec..7528eae 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1985,7 +1985,7 @@ static void shrink_zone(struct zone *zone, struct scan_control *sc)
 			 * whole hierarchy is not sufficient.
 			 */
 			if (!global_reclaim(sc) &&
-					sc->nr_to_reclaim >= sc->nr_reclaimed) {
+					sc->nr_to_reclaim <= sc->nr_reclaimed) {
 				mem_cgroup_iter_break(root, memcg);
 				break;
 			}
-- 
1.7.10.4

-- 
Michal Hocko
SUSE Labs
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