Re: [patch] cgroups: disallow attaching kthreadd

[Tejun Heo]

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@xxxxxxx>

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

Thanks.

-- 
tejun
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