linux-kernel - Re: [PATCH next] memcg: remove PCG_CACHE page

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Date:	Thu, 1 Mar 2012 18:16:00 +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_CACHE page_cgroup flag fix2

On Wed, 29 Feb 2012 18:42:57 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> Add comment to MEM_CGROUP_CHARGE_TYPE_MAPPED case in
> __mem_cgroup_uncharge_common().
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

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

> ---
> This one incremental to patch already in mm-commits.
> 
>  mm/memcontrol.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> --- mm-commits/mm/memcontrol.c	2012-02-28 20:45:43.488100423 -0800
> +++ linux/mm/memcontrol.c	2012-02-29 18:21:49.144702180 -0800
> @@ -2953,6 +2953,11 @@ __mem_cgroup_uncharge_common(struct page
>  
>  	switch (ctype) {
>  	case MEM_CGROUP_CHARGE_TYPE_MAPPED:
> +		/*
> +		 * Generally PageAnon tells if it's the anon statistics to be
> +		 * updated; but sometimes e.g. mem_cgroup_uncharge_page() is
> +		 * used before page reached the stage of being marked PageAnon.
> +		 */
>  		anon = true;
>  		/* fallthrough */
>  	case MEM_CGROUP_CHARGE_TYPE_DROP:
> 

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