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

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Message-ID: <CAOS58YPbYoMJ1+3uRfK_ZERyZoaby=FPW7uTpp8dVOSgYC8Mrw@mail.gmail.com>
Date:	Wed, 31 Oct 2012 13:11:02 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
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

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.

> 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.

Thanks.

-- 
tejun
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