linux-kernel - Re: [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css

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Message-ID: <20121031201415.GG1271@dhcp22.suse.cz>
Date:	Wed, 31 Oct 2012 21:14:16 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	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 1/8] cgroup: kill
 cgroup_subsys->__DEPRECATED_clear_css_refs

On Wed 31-10-12 13:11:02, Tejun Heo wrote:
> Hello,
> 
> On Wed, Oct 31, 2012 at 1:08 PM, Michal Hocko <mhocko@...e.cz> wrote:
> > local_irq_disable doesn't guarantee atomicity, because other CPUs will
> 
> Maybe it should say atomicity on the local CPU.

That would be more clear but being more verbose doesn't hurt either :P

> > see the change in steps so this is a bit misleading. The real reason
> > AFAICS is that we do not want to hang in css_tryget from IRQ context
> > (does this really happen btw.?) which would interrupt cgroup_rmdir
> > between we add CSS_DEACT_BIAS and the group is marked CGRP_REMOVED.
> > Or am I still missing the point?
> 
> Yeah, that's the correct one. We don't want tryget happening between
> DEACT_BIAS and REMOVED as it can hang forever there.

-- 
Michal Hocko
SUSE Labs
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