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Date: Fri, 14 Oct 2011 14:21:30 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Ben Blum <bblum@andrew.cmu.edu>, Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Oleg Nesterov <oleg@redhat.com>,
        linux-kernel@vger.kernel.org, NeilBrown <neilb@suse.de>,
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        Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 2/2] cgroups: convert ss->attach to use whole threadgroup
 flex_array (cpuset, memcontrol)
Message-ID: <20111014122126.GL14968@somewhere>
References: <20110727171101.5e32d8eb@notabene.brown>
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On Thu, Oct 13, 2011 at 08:36:01PM -0400, Ben Blum wrote:
> Convert ss->attach to take a flex_array of tasks instead of just the leader.
> 
> From: Ben Blum <bblum@andrew.cmu.edu>
> 
> This lets subsystems with whole-threadgroup attach calls (i.e., cpuset and
> memcontrol) to accurately find the group's mm even when a non-leader does exec
> and leaves the leader with a NULL mm pointer.
> 
> Also converts cpuset and memcontrol to take the flex_array and iterate down it
> until an mm is found, instead of just attempting to use the leader's mm.
> 
> Signed-off-by: Ben Blum <bblum@andrew.cmu.edu>

I think there are patches from Tejun that handle that did that already?

https://lkml.org/lkml/2011/8/23/418