netdev - Re: [PATCH v2 3/5] change number_of

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Message-ID: <4F960F2A.9020304@jp.fujitsu.com>
Date:	Tue, 24 Apr 2012 11:25:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
CC:	Tejun Heo <tj@...nel.org>, netdev@...r.kernel.org,
	cgroups@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	David Miller <davem@...emloft.net>, devel@...nvz.org
Subject: Re: [PATCH v2 3/5] change number_of_cpusets to an atomic

(2012/04/24 4:37), Glauber Costa wrote:

> This will allow us to call destroy() without holding the
> cgroup_mutex(). Other important updates inside update_flags()
> are protected by the callback_mutex.
> 
> We could protect this variable with the callback_mutex as well,
> as suggested by Li Zefan, but we need to make sure we are protected
> by that mutex at all times, and some of its updates happen inside the
> cgroup_mutex - which means we would deadlock.
> 
> An atomic variable is not expensive, since it is seldom updated,
> and protect us well.
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>


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

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