linux-kernel - Re: [PATCH 11/12] pid: rewrite task helper functions avoiding task->pid and task->tgid

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Message-ID: <20131220045413.GG14944@madcap2.tricolour.ca>
Date:	Thu, 19 Dec 2013 23:54:13 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH 11/12] pid: rewrite task helper functions avoiding
 task->pid and task->tgid

On 13/12/17, Peter Zijlstra wrote:
> On Mon, Dec 16, 2013 at 05:20:51PM -0500, Richard Guy Briggs wrote:
> 
>  >  static inline bool is_idle_task(const struct task_struct *p)
>  >  {
>  > -	return p->pid == 0;
>  > +	return task_pid(p) == &init_struct_pid;
>  >  }
> 
> > I'll stick with task_pid_nr(p) == 0.
> 
> We're going to probably switch to:
> 
>   return p->flags & PF_IDLE;
> 
> Soon, because people are playing silly tricks and want normal threads
> to temporarily appear to be the idle thread (idle time injection).

Ok, this addresses my concerns.  I'll stay out of the way.

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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