linux-kernel - Re: [RFCv3 PATCH 38/48] sched: Infrastructure to query if load balancing is energy-aware

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Message-ID: <20150324135613.GR23123@twins.programming.kicks-ass.net>
Date:	Tue, 24 Mar 2015 14:56:13 +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 38/48] sched: Infrastructure to query if load
 balancing is energy-aware

On Wed, Feb 04, 2015 at 06:31:15PM +0000, Morten Rasmussen wrote:
> From: Dietmar Eggemann <dietmar.eggemann@....com>
> 
> Energy-aware load balancing should only happen if the ENERGY_AWARE feature
> is turned on and the sched domain on which the load balancing is performed
> on contains energy data.
> There is also a need during a load balance action to be able to query if we
> should continue to load balance energy-aware or if we reached the tipping
> point which forces us to fall back to the conventional load balancing
> functionality.

> @@ -7348,6 +7349,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
>  		.cpus		= cpus,
>  		.fbq_type	= all,
>  		.tasks		= LIST_HEAD_INIT(env.tasks),
> +		.use_ea		= (energy_aware() && sd->groups->sge) ? true : false,

fwiw, no tipping point in that logic.
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