linux-kernel - Re: [RFC 3/4] ARM: topology: Update cpu

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Message-ID: <CAORVsuXBOHrhx=AFVgdC01=1YFfBgCDpwBH_cn7LBujLfc0rcg@mail.gmail.com>
Date:	Wed, 13 Jun 2012 14:50:13 +0200
From:	Jean Pihet <jean.pihet@...oldbits.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Amit Kucheria <amit.kucheria@...aro.org>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	linux@....linux.org.uk, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, rob.herring@...xeda.com,
	linaro-dev@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 3/4] ARM: topology: Update cpu_power according to DT information

Hi Amit, Peter,

On Wed, Jun 13, 2012 at 2:47 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2012-06-13 at 18:14 +0530, Amit Kucheria wrote:
>> Various discussions around power-aware scheduling have amplified the
>> need for the scheduler to have some knowledge of DVFS. This would then
>> require the scheduler to track 'cpu_power' ( = max power) and perhaps
>> a new variable 'current_power' that is changed by the DVFS framework.
>
> Note that capacity is in fact a better term -- not to be confused with
> the capacity as currently in use within the load-balancer. Luckily
> there's no way to read that an not be confused.. uhmm :-)
>>
>> The first goal, though, is to make sure that the scheduler can handle
>> different cpu_power values due to asymmetric cores.
>
> I would think the very first goal was to do a simple packing balancer
> before doing silly things with asymmetric setups.. but what do I know.
Sure! First things first ;p

Thanks for the details!

Regards,
Jean
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