linux-kernel - Re: [PATCH 5/6] sched/fair: Get rid of scaling utilization by capacity

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Message-ID: <20150908153300.GK3644@twins.programming.kicks-ass.net>
Date:	Tue, 8 Sep 2015 17:33:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steve Muckle <steve.muckle@...aro.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"yuyang.du@...el.com" <yuyang.du@...el.com>,
	"mturquette@...libre.com" <mturquette@...libre.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Juri Lelli <Juri.Lelli@....com>,
	"sgurrappadi@...dia.com" <sgurrappadi@...dia.com>,
	"pang.xunlei@....com.cn" <pang.xunlei@....com.cn>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] sched/fair: Get rid of scaling utilization by
 capacity_orig

On Tue, Sep 08, 2015 at 03:31:58PM +0100, Morten Rasmussen wrote:
> On Tue, Sep 08, 2015 at 02:52:05PM +0200, Peter Zijlstra wrote:
> > > Tricky that, LOAD_AVG_MAX very much relies on the unit being 1<<10.
> 
> I don't get why LOAD_AVG_MAX relies on the util_avg shifting being
> 1<<10, it is just the sum of the geometric series and the upper bound of
> util_sum?

It needs a 1024, it might just have been the 1024 ns we use a period
instead of the scale unit though.

The LOAD_AVG_MAX is the number where adding a next element to the series
doesn't change the result anymore, so scaling it up will allow more
significant elements to the series before we bottom out, which is the _N
thing.


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