linux-kernel - Re: [PATCH 4/6] cgroups: forbid pre

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Message-ID: <20121018224606.GS13370@google.com>
Date:	Thu, 18 Oct 2012 15:46:06 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>
Subject: Re: [PATCH 4/6] cgroups: forbid pre_destroy callback to fail

On Thu, Oct 18, 2012 at 03:41:48PM -0700, Tejun Heo wrote:
> Note that the patch is broken in a couple places but it does show the
> general direction.  I'd prefer if patch #3 simply makes pre_destroy()
> return 0 and drop __DEPRECATED_clear_css_refs from mem_cgroup_subsys.
> Then, I can pull the branch in and drop all the unnecessary cruft.

But you need the locking change for further memcg cleanup.  To avoid
interlocked pulls from both sides, I think it's okay to push this one
with the rest of memcg changes.  I can do the cleanup on top of this
whole series, but please do drop .__DEPRECATED_clear_css_refs from
memcg.

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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