linux-kernel - Re: [patch] cgroups: disallow attaching kthreadd

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Message-ID: <20120405161156.GB12854@google.com>
Date:	Thu, 5 Apr 2012 09:11:56 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Mike Galbraith <mgalbraith@...e.de>
Cc:	David Rientjes <rientjes@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Menage <paul@...lmenage.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: [patch] cgroups: disallow attaching kthreadd

On Thu, Apr 05, 2012 at 06:47:11AM +0200, Mike Galbraith wrote:
> cgroups: disallow attaching kthreadd 
> 
> Allowing kthreadd to be moved to a non-root group makes no sense, it being
> a global resource, and needlessly leads unsuspecting users toward trouble.
> 
> 1. An RT workqueue worker thread spawned in a task group with no rt_runtime
> allocated is not schedulable.  Simple user error, but harmful to the box.
> 
> 2. A worker thread which acquires PF_THREAD_BOUND can never leave a cpuset,
> rendering the cpuset immortal.
> 
> Save the user some unexpected trouble, just say no.
> 
> Signed-off-by: Mike Galbraith <mgalbraith@...e.de>

Li, I'm gonna route this through for-3.4-fixes.  Can you please ack
it?

Thanks.

-- 
tejun
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