From: Johannes Weiner <hannes@cmpxchg.org>
To: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: balbir@linux.vnet.ibm.com, Minchan Kim <minchan.kim@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [BUGFIX][PATCH v4] memcg: fix memory migration of shmem swapcache
Date: Sat, 8 Jan 2011 10:26:13 +0100 [thread overview]
Message-ID: <20110108092613.GF4654@cmpxchg.org> (raw)
In-Reply-To: <20110106152911.db6c5b2c.nishimura@mxp.nes.nec.co.jp>
On Thu, Jan 06, 2011 at 03:29:11PM +0900, Daisuke Nishimura wrote:
> In current implimentation, mem_cgroup_end_migration() decides whether the page
> migration has succeeded or not by checking "oldpage->mapping".
>
> But if we are tring to migrate a shmem swapcache, the page->mapping of it is
> NULL from the begining, so the check would be invalid.
> As a result, mem_cgroup_end_migration() assumes the migration has succeeded
> even if it's not, so "newpage" would be freed while it's not uncharged.
>
> This patch fixes it by passing mem_cgroup_end_migration() the result of the
> page migration.
>
> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
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next prev parent reply other threads:[~2011-01-08 9:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-05 4:00 [BUGFIX][PATCH] " Daisuke Nishimura
2011-01-05 4:48 ` Minchan Kim
2011-01-05 6:47 ` Daisuke Nishimura
2011-01-05 7:18 ` Minchan Kim
2011-01-06 0:52 ` KAMEZAWA Hiroyuki
2011-01-06 2:51 ` Minchan Kim
2011-01-05 11:58 ` Johannes Weiner
2011-01-06 1:09 ` Daisuke Nishimura
2011-01-06 1:55 ` KAMEZAWA Hiroyuki
2011-01-06 2:49 ` Minchan Kim
2011-01-06 3:34 ` [BUGFIX][PATCH v3] " Daisuke Nishimura
2011-01-06 5:42 ` Balbir Singh
2011-01-06 6:29 ` [BUGFIX][PATCH v4] " Daisuke Nishimura
2011-01-08 9:26 ` Johannes Weiner [this message]
2011-01-10 9:05 ` Balbir Singh
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