Re: [PATCH 1/4] cgroup: remove redundant get/put of old css_set from migrate

[Li Zefan <lizf@cn.fujitsu.com>]

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.
> 
> While at it, renamed css_set_check_fetched to css_set_fetched.
> !css_set_fetched() seems to read better than
> !css_set_check_fetched().
> 
> Changes in V4:
> * https://lkml.org/lkml/2011/12/20/368 (Tejun Heo)
>   * Fix typo in commit message
>   * Undid the rename of css_set_check_fetched
> * https://lkml.org/lkml/2011/12/20/427 (Li Zefan)
>   * Fix comment in cgroup_task_migrate()
> Changes in V3:
> * https://lkml.org/lkml/2011/12/20/255 (Frederic Weisbecker)
>   * Fixed to put error in retval
> Changes in V2:
> * https://lkml.org/lkml/2011/12/19/289 (Tejun Heo)
>   * Updated commit message
> 
> Signed-off-by: Mandeep Singh Baines <msb@chromium.org>

Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>

> 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>
> ---
>  kernel/cgroup.c |   28 ++++++++--------------------
>  1 files changed, 8 insertions(+), 20 deletions(-)