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Subject: Re: [patch 3/6] sched: use rq->avg_event to resurrect nohz
 ratelimiting
From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>,
        "Van De Ven, Arjan" <arjan.van.de.ven@intel.com>
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Date: Fri, 18 Nov 2011 18:42:26 +0100
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On Fri, 2011-11-18 at 16:36 +0100, Peter Zijlstra wrote:
> On Fri, 2011-11-18 at 16:19 +0100, Mike Galbraith wrote:
> > Entering nohz at high frequency eats cycles, ratelimit it
> > just as we do idle_balance(), and for the same reason.
> > 
> > Signed-off-by: Mike Galbraith <efault@gmx.de>
> 
> Arjan, can we do something smart with the idle governor which already
> guestimates the idle duration for us?

That would be great.  Won't help my Intel Q6600 though, the intel_idle
governor doesn't support it.  Other idle_governor gizmos really need to
get smarter too.

	-Mike