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    SubjectRe: [PATCH] cgroup: remove redundate get/put of old css_set from migrate
    On Fri, Dec 16, 2011 at 08:38:31AM -0800, Mandeep Singh Baines wrote:
    > We can now assume that the css_set reference held by the task
    > will not go away for an exiting task. PF_EXITING state can be
    > trusted throughout migration by checking it after locking
    > threadgroup.
    >
    > This patch depends on:
    >
    > commit cd3d095275374220921fcf0d4e0c16584b26ddbc
    > Author: Tejun Heo <tj@kernel.org>
    > Date: Mon Dec 12 18:12:21 2011 -0800
    >
    > cgroup: always lock threadgroup during migration
    >
    > Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
    > Cc: Tejun Heo <tj@kernel.org>
    > Cc: Li Zefan <lizf@cn.fujitsu.com>
    > Cc: containers@lists.linux-foundation.org
    > Cc: cgroups@vger.kernel.org
    > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    > Cc: Frederic Weisbecker <fweisbec@gmail.com>
    > Cc: Oleg Nesterov <oleg@redhat.com>
    > Cc: Andrew Morton <akpm@linux-foundation.org>
    > Cc: Paul Menage <paul@paulmenage.org>

    Li, can you please ack this?

    Thanks.

    --
    tejun


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