linux-kernel - Re: [PATCH next] memcg: remove PCG_FILE

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Message-Id: <20120229144037.19ec6efa.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 29 Feb 2012 14:40:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH next] memcg: remove PCG_FILE_MAPPED fix cosmetic fix

On Tue, 28 Feb 2012 21:28:40 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> mem_cgroup_move_account() begins with "anon = PageAnon(page)", and
> then anon is used thereafter: testing PageAnon(page) in the middle
> makes the reader wonder if there's some race to guard against - no.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Thanks.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

> ---
> 
>  mm/memcontrol.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- 3.3-rc5-next/mm/memcontrol.c	2012-02-27 09:56:59.072001463 -0800
> +++ linux/mm/memcontrol.c	2012-02-28 20:45:43.488100423 -0800
> @@ -2560,7 +2560,7 @@ static int mem_cgroup_move_account(struc
>  
>  	move_lock_mem_cgroup(from, &flags);
>  
> -	if (!PageAnon(page) && page_mapped(page)) {
> +	if (!anon && page_mapped(page)) {
>  		/* Update mapped_file data for mem_cgroup */
>  		preempt_disable();
>  		__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> 

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