linux-kernel - Re: [PATCH 1/2] cgroup: Remove unnecessary task_lock before fetching css

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Date:	Tue, 20 Dec 2011 11:14:43 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>,
	Cgroups <cgroups@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <paul@...lmenage.org>,
	Mandeep Singh Baines <msb@...omium.org>
Subject: Re: [PATCH 1/2] cgroup: Remove unnecessary task_lock before
 fetching css_set on migration

Hello, Frederic.

On Tue, Dec 20, 2011 at 08:01:12PM +0100, Frederic Weisbecker wrote:
> When we fetch the css_set of the tasks on cgroup migration, we don't need
> anymore to synchronize against cgroup_exit() that could swap the old one
> with init_css_set. Now that we are using threadgroup_lock() during
> the migrations, we don't need to worry about it anymore.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Containers <containers@...ts.linux-foundation.org>
> Cc: Cgroups <cgroups@...r.kernel.org>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Paul Menage <paul@...lmenage.org>
> Cc: Mandeep Singh Baines <msb@...omium.org>

I like this but it doesn't apply on top of cgroup/for-3.3.  It
collides with Mandeep's patch.  Can you please rebase?

Li, can you please ack?

Thanks.

-- 
tejun
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