linux-kernel - Re: [RFC][PATCH v5 06/14] sched: create a new field with available capacity

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Date:	Tue, 12 Nov 2013 12:05:45 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Lukasz Majewski <l.majewski@...sung.com>
Subject: Re: [RFC][PATCH v5 06/14] sched: create a new field with available capacity

On 12 November 2013 11:34, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Oct 18, 2013 at 01:52:19PM +0200, Vincent Guittot wrote:
>> This new field power_available reflects the available capacity of a CPU
>> unlike the cpu_power which reflects the current capacity.
>
>> -     sdg->sgp->power_orig = sdg->sgp->power = power;
>> +     sdg->sgp->power_orig = sdg->sgp->power_available = available;
>> +     sdg->sgp->power = power;
>
> This patch leaves me confused as to power_available vs power_orig and
> the Changelog doesn't really clarify anything much at all.

Ok, i will add more details in the changelog
power_ori can only modified for SMT purpose otherwise it stays to 1024
whereas power_available take into account the modification that has
been done by the platform.

I can probably re-factor that and merge power_ori and power_available.
At now,  arch_scale_smt_power and arch_scale_freq_power are not used
simultaneously by an architecture so I can probably move the returned
value of arch_scale_freq_power into the power_ori. This would even
make more sense regarding the current use of it.
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