linux-kernel - Re: [PATCH RESEND v9 00/10] sched: consolidation of CPU capacity and usage

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Message-ID: <20150220113447.GO5029@twins.programming.kicks-ass.net>
Date:	Fri, 20 Feb 2015 12:34:47 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"kamalesh@...ux.vnet.ibm.com" <kamalesh@...ux.vnet.ibm.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"efault@....de" <efault@....de>,
	"nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>
Subject: Re: [PATCH RESEND v9 00/10] sched: consolidation of CPU capacity and
 usage

On Thu, Feb 19, 2015 at 12:49:40PM +0000, Morten Rasmussen wrote:

> Also, it still not clear why patch 10 uses relative capacity reduction
> instead of absolute capacity available to CFS tasks.

As present in your asymmetric big and small systems? Yes it would be
unfortunate to migrate a task to an idle small core when the big core is
still faster, even if reduced by rt/irq work.
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