linux-kernel - Re: [patch 7/8] mm: memcg: modify PageCgroupAcctLRU non-atomically

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Message-Id: <20111124090915.2f6e2e2c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 24 Nov 2011 09:09:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 7/8] mm: memcg: modify PageCgroupAcctLRU non-atomically

On Wed, 23 Nov 2011 16:42:30 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> From: Johannes Weiner <jweiner@...hat.com>
> 
> This bit is protected by zone->lru_lock, there is no need for locked
> operations when setting and clearing it.
> 
> Signed-off-by: Johannes Weiner <jweiner@...hat.com>

This atomic ops are for avoiding race with other ops as lock_page_cgroup().
Or other Set/ClearPageCgroup....

Do I misunderstand atomic ops v.s. non-atomic ops race ?

Thanks,
-Kame

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