linux-kernel - Re: [patch 4/7] sched: convert rq->avg_idle to rq->avg

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Message-ID: <1322050165.7041.5.camel@marge.simson.net>
Date:	Wed, 23 Nov 2011 13:09:25 +0100
From:	Mike Galbraith <mgalbraith@...e.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>
Subject: Re: [patch 4/7] sched: convert rq->avg_idle to rq->avg_event

On Wed, 2011-11-23 at 12:55 +0100, Peter Zijlstra wrote:
> On Tue, 2011-11-22 at 15:22 +0100, Mike Galbraith wrote:
> > We update rq->clock only at points of interest to the scheduler.
> > Using this distance has the same effect as measuring idle time
> > for idle_balance() throttling, and allows other uses as well. 
> 
> I'm not sure I follow, suppose we're happily context switching away, how
> is the avg distance between context switches related to idle time?

Average idle time can't be larger.

	-Mike 


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