linux-kernel - Re: [RFC] A new CPU load metric for power-efficient scheduler: CPU ConCurrency

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Date:	Fri, 25 Apr 2014 08:23:40 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	arjan.van.de.ven@...el.com, len.brown@...el.com,
	rafael.j.wysocki@...el.com, alan.cox@...el.com,
	mark.gross@...el.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org
Subject: Re: [RFC] A new CPU load metric for power-efficient scheduler: CPU
 ConCurrency

On Fri, 2014-04-25 at 03:30 +0800, Yuyang Du wrote:

> To track CC, we intercept the scheduler in 1) enqueue, 2) dequeue, 3)
> scheduler tick, and 4) enter/exit idle.

Boo hiss to 1, 2 and 4.  Less fastpath math would be better.

-Mike

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