linux-kernel - Re: [PATCH] [TRIVIAL] memcg: fix memory.memsw.usage_in

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Message-Id: <20091210101355.d94988cf.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 10 Dec 2009 10:13:55 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH] [TRIVIAL] memcg: fix memory.memsw.usage_in_bytes for
 root cgroup

On Wed, 9 Dec 2009 16:21:09 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Thu, 10 Dec 2009 08:59:29 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> 
> > On Wed,  9 Dec 2009 17:48:58 +0200
> > "Kirill A. Shutemov" <kirill@...temov.name> wrote:
> > 
> > > We really want to take MEM_CGROUP_STAT_SWAPOUT into account.
> > > 
> > > Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
> > > Cc: stable@...nel.org
> > 
> > Thanks.
> > 
> > Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> 
> Is this bug sufficiently serious to justify a -stable backport?
> 
I think so.

> If so, why?
> 

memory cgroup has a file memory.memsw.usage_in_bytes file. It shows sum of
the usage of pages and swapents in the cgroup.  Now, root cgroup's 
memsw.usage_in_bytes shows wrong value....the number of swapents are not
added. This patch fixesi it.

Thanks,
-Kame

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