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Subject: Re: [PATCH 15/32] nohz/cpuset: Restart tick when switching to idle
 task
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anton Blanchard <anton@au1.ibm.com>, Avi Kivity <avi@redhat.com>,
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        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tim Pepper <lnxninja@linux.vnet.ibm.com>,
        Paul Menage <paul@paulmenage.org>
Date: Tue, 30 Aug 2011 17:35:59 +0200
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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.