linux-kernel - Re: [PATCH 03/10] memcg: create extensible page stat update routines

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Date:	Wed, 6 Oct 2010 00:42:50 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 03/10] memcg: create extensible page stat update
 routines

On Sun, Oct 03, 2010 at 11:57:58PM -0700, Greg Thelen wrote:
> Replace usage of the mem_cgroup_update_file_mapped() memcg
> statistic update routine with two new routines:
> * mem_cgroup_inc_page_stat()
> * mem_cgroup_dec_page_stat()
> 
> As before, only the file_mapped statistic is managed.  However,
> these more general interfaces allow for new statistics to be
> more easily added.  New statistics are added with memcg dirty
> page accounting.
> 
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> Signed-off-by: Andrea Righi <arighi@...eler.com>
> ---
>  include/linux/memcontrol.h |   31 ++++++++++++++++++++++++++++---
>  mm/memcontrol.c            |   17 ++++++++---------
>  mm/rmap.c                  |    4 ++--
>  3 files changed, 38 insertions(+), 14 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 159a076..7c7bec4 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -25,6 +25,11 @@ struct page_cgroup;
>  struct page;
>  struct mm_struct;
>  
> +/* Stats that can be updated by kernel. */
> +enum mem_cgroup_write_page_stat_item {
> +	MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
> +};
> +

mem_cgrou_"write"_page_stat_item?
Does "write" make sense to abstract page_state generally?

-- 
Kind regards,
Minchan Kim
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