linux-kernel - Re: [patch 3/6] sched: use rq->avg_event to resurrect nohz ratelimiting

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Message-ID: <1321638146.6238.20.camel@marge.simson.net>
Date:	Fri, 18 Nov 2011 18:42:26 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Subject: Re: [patch 3/6] sched: use rq->avg_event to resurrect nohz
 ratelimiting

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@....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

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