linux-kernel - Re: [PATCH 2/2] cgroup: make css->refcnt clearing on cgroup removal optional

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Message-ID: <20120518175548.GM19388@google.com>
Date:	Fri, 18 May 2012 10:55:48 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Li Zefan <lizefan@...wei.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, fweisbec@...il.com, rni@...gle.com,
	ctalbott@...gle.com, Vivek Goyal <vgoyal@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 2/2] cgroup: make css->refcnt clearing on cgroup
 removal optional

On Thu, May 17, 2012 at 12:33:05AM +0200, Sasha Levin wrote:
> Hi Tejun,
> 
> On Sun, Apr 1, 2012 at 8:54 PM, Tejun Heo <tj@...nel.org> wrote:
> > Hello, Li.
> >
> > On Sun, Apr 01, 2012 at 10:00:26AM +0800, Li Zefan wrote:
> >> > Signed-off-by: Tejun Heo <tj@...nel.org>
> >>
> >> Both patches look good.
> >>
> >> Acked-by: Li Zefan <lizefan@...wei.com>
> >
> > Alright, adding the patches to cgroup/for-3.5.
> 
> This patch allows for race when removing a cgroup since one of the
> css's may still have a dentry ref when the cgroup is removed, no? Is
> there a plan to deal with that before this patch gets pushed into 3.5?

Can you please elaborate?

Thanks.

-- 
tejun
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