linux-kernel - Re: [RFCv2 PATCH 08/23] sched: Aggregate unweighted load contributed by task entities on parenting cfs

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Date:	Fri, 4 Jul 2014 07:50:45 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"Dietmar.Eggemann@....com" <Dietmar.Eggemann@....com>,
	"pjt@...gle.com" <pjt@...gle.com>
Subject: Re: [RFCv2 PATCH 08/23] sched: Aggregate unweighted load contributed
 by task entities on parenting cfs_rq

On Fri, Jul 04, 2014 at 12:25:55AM +0800, Morten Rasmussen wrote:
> From: Dietmar Eggemann <dietmar.eggemann@....com>
> 
> Energy aware scheduling relies on cpu utilization and to be able to
> maintain it, we need a per run queue signal of the sum of the
> unweighted, i.e. not scaled with task priority, load contribution of
> runnable task entries.
> 
> The unweighted runnable load on a run queue is maintained alongside the
> existing (weighted) runnable load.
> 
> This patch is the unweighted counterpart of "sched: Aggregate load
> contributed by task entities on parenting cfs_rq" (commit id
> 2dac754e10a5).
> 
Hi Dietmar and Morten,

You may or may not have noticed my patch the other day:

sched: Rewrite per entity runnable load average tracking

With this new load average tracking, unweighted load average will be very much
simplifed to do.

Thanks,
Yuyang
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