linux-kernel - [RFC][PATCH -mmotm 1/4] memcg: don't trigger oom at page migration

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Message-Id: <20081205212304.f7018ea1.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 5 Dec 2008 21:23:04 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>, nishimura@....nes.nec.co.jp
Subject: [RFC][PATCH -mmotm 1/4] memcg: don't trigger oom at page migration

I think triggering OOM at mem_cgroup_prepare_migration would be just a bit
overkill.
Returning -ENOMEM would be enough for mem_cgroup_prepare_migration.
The caller would handle the case anyway.

Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
---
 mm/memcontrol.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4dbce1d..50ee1be 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1330,7 +1330,7 @@ int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
 	unlock_page_cgroup(pc);
 
 	if (mem) {
-		ret = mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem);
+		ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);
 		css_put(&mem->css);
 	}
 	*ptr = mem;
--
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