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

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Message-ID: <20111220192703.GB17668@somewhere>
Date:	Tue, 20 Dec 2011 20:27:04 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Tejun Heo <tj@...nel.org>
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

On Tue, Dec 20, 2011 at 11:14:43AM -0800, Tejun Heo wrote:
> 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?

Yeah it was made on top of last Mandeep's patch. Let me
rebase on top of your branch, will resend soon.

Thanks.

> 
> Li, can you please ack?
> 
> Thanks.
> 
> -- 
> tejun
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