linux-kernel - Re: [PATCH 15/32] nohz/cpuset: Restart tick when switching to idle task

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Message-ID: <1314718559.5812.19.camel@twins>
Date:	Tue, 30 Aug 2011 17:35:59 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>,
	Paul Menage <paul@...lmenage.org>
Subject: Re: [PATCH 15/32] nohz/cpuset: Restart tick when switching to idle
 task

On Tue, 2011-08-30 at 17:04 +0200, Frederic Weisbecker wrote:
> > ... so basically you say:
> > 
> >   Restart the tick when we switch to idle.
> > 
> > Now all that needs is an explanation of why..
> 
> In the end we don't want to restart the tick when we switch to idle.
> But to support that I'll need to tweak various things on idle time
> accounting, otherwise the [cpu] time spent in idle is going to be
> accounted as system time.

Ok, so then the changelog should say so, preferably with a little bit
more detail on how exactly the idle time accounting would go tits-up.
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