linux-kernel - Re: 3.13-rc breaks MEMCG

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Message-ID: <20131216172143.GJ32509@htj.dyndns.org>
Date:	Mon, 16 Dec 2013 12:21:43 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Li Zefan <lizefan@...wei.com>, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 3.13-rc breaks MEMCG_SWAP

Hey,

On Mon, Dec 16, 2013 at 06:19:37PM +0100, Michal Hocko wrote:
> I have to think about it some more (the brain is not working anymore
> today). But what we really need is that nobody gets the same id while
> the css is alive. So css_from_id returning NULL doesn't seem to be
> enough.

Oh, I meant whether it's necessary to keep css_from_id() working
(ie. doing successful lookups) between offline and release, because
that's where lifetimes are coupled.  IOW, if it's enough for cgroup to
not recycle the ID until all css's are released && fail css_from_id()
lookup after the css is offlined, I can make a five liner quick fix.

Thanks.

-- 
tejun
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