linux-kernel - Re: [bug][mmtom] memcg: MEM_CGROUP

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Message-Id: <20081219184017.7da8748e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 19 Dec 2008 18:40:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"Hugh Dickins" <hugh@...itas.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [bug][mmtom] memcg: MEM_CGROUP_ZSTAT underflow

On Fri, 19 Dec 2008 18:29:29 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> +	/*
> + 	 * Don't clear pc->mem_cgroup because del_from_lru() will see this.
> + 	 * The fully unchaged page is assumed to be freed after us, so it's
> + 	 * safe. When this page is reused before free, we have to be careful.
> + 	 * (In SwapCache case...it can happen.)
> +  	 */
>  
Maybe this is better.
==
       /*
         * Don't clear pc->mem_cgroup because del_from_lru() may see this.
         * If this page is fully unchaged, it's assumed to be freed soon,or it
         * is isolated from LRU.  When this page is reused before free
         * (and on LRU), we have to be careful.
         * (In SwapCache case...it can happen.)
         */
==
Hmm.

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