linux-kernel - Re: [RFCv3 PATCH 43/48] sched: Introduce energy awareness into detach

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Message-ID: <20150324152505.GS23123@twins.programming.kicks-ass.net>
Date:	Tue, 24 Mar 2015 16:25:05 +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 43/48] sched: Introduce energy awareness into
 detach_tasks

On Wed, Feb 04, 2015 at 06:31:20PM +0000, Morten Rasmussen wrote:
> From: Dietmar Eggemann <dietmar.eggemann@....com>
> 
> Energy-aware load balancing does not rely on env->imbalance but instead it
> evaluates the system-wide energy difference for each task on the src rq by
> potentially moving it to the dst rq. If this energy difference is lesser
> than zero the task is actually moved from src to dst rq.

See this is another place where the parameterization makes perfect
sense; the weight imbalance or the energy difference is the 'same' thing
just a different unit.

All we really need is a task -> unit map to make this whole again.
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