linux-kernel - Re: [PATCH v9 03/13] memcg: add dirty page accounting infrastructure

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Date:	Thu, 18 Aug 2011 09:39:59 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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, linux-fsdevel@...r.kernel.org,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Dave Chinner <david@...morbit.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <andrea@...terlinux.com>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v9 03/13] memcg: add dirty page accounting
 infrastructure

On Wed, 17 Aug 2011 09:14:55 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> Add memcg routines to count dirty, writeback, and unstable_NFS pages.
> These routines are not yet used by the kernel to count such pages.  A
> later change adds kernel calls to these new routines.
> 
> As inode pages are marked dirty, if the dirtied page's cgroup differs
> from the inode's cgroup, then mark the inode shared across several
> cgroup.
> 
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> Signed-off-by: Andrea Righi <andrea@...terlinux.com>

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

A nitpick..



> +static inline
> +void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
> +				       struct mem_cgroup *to,
> +				       enum mem_cgroup_stat_index idx)
> +{
> +	preempt_disable();
> +	__this_cpu_dec(from->stat->count[idx]);
> +	__this_cpu_inc(to->stat->count[idx]);
> +	preempt_enable();
> +}
> +

this_cpu_dec()
this_cpu_inc()

without preempt_disable/enable will work. CPU change between dec/inc will
not be problem.

Thanks,
-Kame



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