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

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Message-ID: <20150916153655.GE3604@twins.programming.kicks-ass.net>
Date:	Wed, 16 Sep 2015 17:36:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	bsegall@...gle.com
Cc:	Morten Rasmussen <morten.rasmussen@....com>,
	Yuyang Du <yuyang.du@...el.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Steve Muckle <steve.muckle@...aro.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"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 Mon, Sep 14, 2015 at 10:34:00AM -0700, bsegall@...gle.com wrote:

> It has never been clear to me what
> SCHED_LOAD_SCALE/SCHED_LOAD_SHIFT were for as opposed to NICE_0_LOAD,

SCHED_LOAD_SCALE/SHIFT are the fixed point mult/shift, and NICE_0_LOAD
is the load of a nice-0 task. They happen to be the same by the choice
that nice-0 has a load of 1 (the only natural choice given proportional
weight and hyperboles etc..).

But for the fixed point math we use SCHED_LOAD_* and only when we want
to explicitly use the unit load we use NICE_0_LOAD (its only used 4-5
times or so).


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