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

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Message-ID: <55118F3B.1040203@arm.com>
Date:	Tue, 24 Mar 2015 16:22:19 +0000
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"yuyang.du@...el.com" <yuyang.du@...el.com>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"nico@...aro.org" <nico@...aro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Juri Lelli <Juri.Lelli@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv3 PATCH 38/48] sched: Infrastructure to query if load balancing
 is energy-aware

On 24/03/15 13:56, Peter Zijlstra wrote:
> 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.

Wanted to explain why I added lv_env::use_ea. But mentioning the tipping 
point problem here seems to be a little far-fetched. Will get rid of the 
second sentence in the header.

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