From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH] cgroup: remove redundate get/put of old css_set from migrate Date: Mon, 19 Dec 2011 09:16:33 -0800 Message-ID: <20111219171633.GI24519@google.com> References: <1324053511-24591-1-git-send-email-msb@chromium.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1324053511-24591-1-git-send-email-msb-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Mandeep Singh Baines Cc: Frederic Weisbecker , containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Oleg Nesterov , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrew Morton , Paul Menage List-Id: containers.vger.kernel.org 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 > Date: Mon Dec 12 18:12:21 2011 -0800 > > cgroup: always lock threadgroup during migration > > Signed-off-by: Mandeep Singh Baines > Cc: Tejun Heo > Cc: Li Zefan > Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org > Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > Cc: KAMEZAWA Hiroyuki > Cc: Frederic Weisbecker > Cc: Oleg Nesterov > Cc: Andrew Morton > Cc: Paul Menage Li, can you please ack this? Thanks. -- tejun