Date: Thu, 15 Jan 2009 12:08:29 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: balbir@linux.vnet.ibm.com, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
       LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Pavel Emelyanov <xemul@openvz.org>, Li Zefan <lizf@cn.fujitsu.com>,
       Paul Menage <menage@google.com>
Subject: Re: [RFC][PATCH 5/4] memcg: don't call res_counter_uncharge when
 obsolete
Message-Id: <20090115120829.e1d417e8.kamezawa.hiroyu@jp.fujitsu.com>
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	<20090114135539.GA21516@balbir.in.ibm.com>
	<20090115114846.388781a7.kamezawa.hiroyu@jp.fujitsu.com>
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On Thu, 15 Jan 2009 11:48:46 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> On Wed, 14 Jan 2009 19:25:39 +0530
> Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> > I liked the earlier, EBUSY approach that ensured that parents could
> > not go away if children exist. IMHO, the code has gotten too complex
> > and has too many corner cases. Time to revisit it.
> > 
> It's on my plan. 
> I'll fix this by CSS-ID patch.
> 
> When I recored memcg's CSS-ID to swap_cgroup (not pointer to memcg), 
> we never need memcg's refcnt.
> 
Sorry, ignore this. refcnt in memcg is necessary anyway to prevent reuse of ID.

-Kame

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