linux-kernel - Re: query: [PATCH 2/2] cgroup: Remove call to synchronize_rcu in cgroup_attach

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Message-ID: <1302770675.7529.2.camel@marge.simson.net>
Date:	Thu, 14 Apr 2011 10:44:35 +0200
From:	Mike Galbraith <efault@....de>
To:	Paul Menage <menage@...gle.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: query: [PATCH 2/2] cgroup: Remove call to synchronize_rcu in
 cgroup_attach_task

On Thu, 2011-04-14 at 10:34 +0200, Mike Galbraith wrote:
> > > On Wed, 2011-04-13 at 15:16 +0200, Paul Menage wrote:
> 
> > > > > +       kfree(cgrp);
> > > > 
> > > > We might want to punt this through RCU again, in case the subsystem
> > > > destroy() callbacks left anything around that was previously depending
> > > > on the RCU barrier.
> 
> Yup, great idea.  Two stage teardown/free quenched the fireworks

Correction:  made fireworks take longer to ignite.   Roughly a minute
after I poked xmit, box exploded.  Hohum.  BTTODB

	-Mike


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