linux-kernel - [BUGFIX][PATCH] memcg: fix wrong decision of noswap with softlimit.

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Message-Id: <20110609095445.5f98b752.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 9 Jun 2011 09:54:45 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"bsingharora@...il.com" <bsingharora@...il.com>
Subject: [BUGFIX][PATCH] memcg: fix wrong decision of noswap with softlimit.

I wonder this should go stable...
==
>From e2565de1c764057b75b4d9a1674d163b6c873cdd Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Date: Thu, 9 Jun 2011 09:54:32 +0900
Subject: [PATCH 2/2] Fix softlimit wrong check of noswap

Now, hierarchical reclaim doesn't make swap if memory's limit is
equal to mem+swap limit. Because if reclaim does swap-out,
it still hits mem+swap limit and there will be no progress.
WHEN HITTING HARD LIMIT.

When it comes to softlimit, it works for kswapd. noswap is nonsense.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3baddcb..06825be 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1663,7 +1663,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
 	excess = res_counter_soft_limit_excess(&root_mem->res) >> PAGE_SHIFT;
 
 	/* If memsw_is_minimum==1, swap-out is of-no-use. */
-	if (root_mem->memsw_is_minimum)
+	if (!check_soft && root_mem->memsw_is_minimum)
 		noswap = true;
 
 	while (1) {
-- 
1.7.4.1


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