linux-kernel - Re: [RFC][PATCH 5/4] memcg: don't call res_counter

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Date:	Thu, 15 Jan 2009 12:08:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Li Zefan <lizf@...fujitsu.com>, Paul Menage <menage@...gle.com>
Subject: Re: [RFC][PATCH 5/4] memcg: don't call res_counter_uncharge when
 obsolete

On Thu, 15 Jan 2009 11:48:46 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Wed, 14 Jan 2009 19:25:39 +0530
> Balbir Singh <balbir@...ux.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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