linux-kernel - Re: [PATCH] memcg: remove unneeded preempt

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Message-Id: <20110818155234.e8afee9b.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 18 Aug 2011 15:52:34 +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,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH] memcg: remove unneeded preempt_disable

On Wed, 17 Aug 2011 23:50:53 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> Both mem_cgroup_charge_statistics() and mem_cgroup_move_account() were
> unnecessarily disabling preemption when adjusting per-cpu counters:
>     preempt_disable()
>     __this_cpu_xxx()
>     __this_cpu_yyy()
>     preempt_enable()
> 
> This change does not disable preemption and thus CPU switch is possible
> within these routines.  This does not cause a problem because the total
> of all cpu counters is summed when reporting stats.  Now both
> mem_cgroup_charge_statistics() and mem_cgroup_move_account() look like:
>     this_cpu_xxx()
>     this_cpu_yyy()
> 
> Reported-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Greg Thelen <gthelen@...gle.com>

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

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