linux-kernel - Re: [PATCH 2/8] cgroup: kill CSS

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Message-ID: <CAOS58YP=CjTPFdETLRXnc3gXEzX2=EEe2dMdSh3Eov7zRfV4Qg@mail.gmail.com>
Date:	Wed, 31 Oct 2012 10:10:44 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Michal Hocko <mhocko@...e.cz>, lizefan@...wei.com,
	hannes@...xchg.org, bsingharora@...il.com,
	kamezawa.hiroyu@...fujitsu.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] cgroup: kill CSS_REMOVED

Hello, Glauber.

On Wed, Oct 31, 2012 at 10:06 AM, Glauber Costa <glommer@...allels.com> wrote:
> This is not the topic of this thread, but since you brought it:
> If you take a look at the description patch in the patch I sent, the
> problem I outlined is that at create time, we don't know anything about
> which will the css_id be - and I would like to avoid creating yet
> another index.
>
> Is there any way you would suggest of handling this ? Any chance of us
> allocating the css_id earlier then?

I only glanced the patch description but the problem I'm trying to
solve is locking - currently we don't have a place where a controller
can tell a cgroup is becoming online; thus it has nothing to
synchronized against and tell that a cgroup is alive or not.  As for
css_id allocation, maybe you can deal with that in ->post_create() or
maybe we can allocate css_id earlier (but where would it be stored?).
I'll look into it.

Thanks.

-- 
tejun
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