linux-kernel - Re: patch] cpusets, cgroups: disallow attaching kthreadd

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Date:	Tue, 18 Oct 2011 10:47:09 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <htejun@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <paul@...lmenage.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: patch] cpusets, cgroups: disallow attaching kthreadd

On Tue, 2011-10-18 at 10:42 +0200, Peter Zijlstra wrote:

> Why special case these two, why not simply disallow moving kthreadd into
> _any_ cgroup what so ever and be done with it?

These were the cases where it hurt, and cpusets don't have to be a
component of a cgroup.  So we'd still need the cpuset bit.

> 
> ---
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 453100a..18eed58 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1824,6 +1824,9 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
>  	struct cgroup *oldcgrp;
>  	struct cgroupfs_root *root = cgrp->root;
>  
> +	if (tsk == kthreadd_task)
> +		return -EINVAL;
> +
>  	/* Nothing to do if the task is already in that cgroup */
>  	oldcgrp = task_cgroup_from_root(tsk, root);
>  	if (cgrp == oldcgrp)
> 


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