linux-kernel - Re: [RFC PATCH 03/15] nohz_task: Make tick stop and restart callable outside idle

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Message-ID: <20101221013437.GL1715@nowhere>
Date:	Tue, 21 Dec 2010 02:34:39 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 03/15] nohz_task: Make tick stop and restart
 callable outside idle

On Mon, Dec 20, 2010 at 05:25:11PM +0100, Peter Zijlstra wrote:
> On Mon, 2010-12-20 at 11:19 -0500, Steven Rostedt wrote:
> > On Mon, 2010-12-20 at 16:48 +0100, Peter Zijlstra wrote:
> > > On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> > > > +                       if (!current->pid)
> > > 
> > > I'm not exactly sure that's the sanest way to test if you're the idle
> > > thread...
> > 
> > Would
> > 
> >  if (idle_cpu(cpu))
> > 
> > be better?
> 
> Lots ;-)

I wondered about that too, will update.

Thanks.
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