linux-kernel - Re: [RFCv3 PATCH 46/48] sched: Turn off fast idling of cpus on a partially loaded system

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Message-ID: <20150324160155.GV23123@twins.programming.kicks-ass.net>
Date:	Tue, 24 Mar 2015 17:01:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	mingo@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, yuyang.du@...el.com,
	preeti@...ux.vnet.ibm.com, mturquette@...aro.org, nico@...aro.org,
	rjw@...ysocki.net, juri.lelli@....com, linux-kernel@...r.kernel.org
Subject: Re: [RFCv3 PATCH 46/48] sched: Turn off fast idling of cpus on a
 partially loaded system

On Wed, Feb 04, 2015 at 06:31:23PM +0000, Morten Rasmussen wrote:
> From: Dietmar Eggemann <dietmar.eggemann@....com>
> 
> We do not want to miss out on the ability to do energy-aware idle load
> balancing if the system is only partially loaded since the operational
> range of energy-aware scheduling corresponds to a partially loaded
> system. We might want to pull a single remaining task from a potential
> src cpu towards an idle destination cpu if the energy model tells us
> this is worth doing to save energy.

Should this not pair with a change to need_active_balance() ?
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