linux-kernel - Re: [RFD 1/9] Change cpustat fields to an array.

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Date:	Tue, 27 Sep 2011 23:03:29 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, paul@...lmenage.org,
	lizf@...fujitsu.com, daniel.lezcano@...e.fr,
	jbottomley@...allels.com
Subject: Re: [RFD 1/9] Change cpustat fields to an array.

On Fri, 2011-09-23 at 19:20 -0300, Glauber Costa wrote:
> @@ -623,6 +624,9 @@ static inline struct task_group *task_group(struct
> task_struct *p)
>         struct task_group *tg;
>         struct cgroup_subsys_state *css;
>  
> +       if (!p->mm)
> +               return &root_task_group;
> +
>         css = task_subsys_state_check(p, cpu_cgroup_subsys_id,
>                         lockdep_is_held(&p->pi_lock) ||
>                         lockdep_is_held(&task_rq(p)->lock)); 

Hmm, why is that? Aren't kthreads part of the cgroup muck just as much
as normal tasks are?
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