linux-kernel - Re: [PATCH V3 1/7] sched: Create sched_select_cpu() to give preferred CPU for power saving

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Message-ID: <CAKohpokB3yeXuLVe_0fWuMRVMKWJktDU7UrMepfd+3N0GmNtMw@mail.gmail.com>
Date:	Mon, 18 Mar 2013 21:14:11 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	pjt@...gle.com, paul.mckenney@...aro.org, tglx@...utronix.de,
	tj@...nel.org, suresh.b.siddha@...el.com, venki@...gle.com,
	mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org,
	linaro-kernel@...ts.linaro.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, Arvind.Chauhan@....com,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/7] sched: Create sched_select_cpu() to give preferred
 CPU for power saving

On Mon, Mar 18, 2013 at 9:09 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> 2013/3/18 Viresh Kumar <viresh.kumar@...aro.org>:

>> +static inline int sched_select_cpu(unsigned int sd_flags)
>> +{
>> +       return raw_smp_processor_id();
>
> I feel this should be symetric with the requirement of having
> preemption disabled as in the CONFIG_NO_HZ version. This should be
> smp_processor_id().

Yes, my fault.

>> +int sched_select_cpu(unsigned int sd_flags)
>
> It would be nice to have some more precise naming. sched_select_busy_cpu() ?

You are correct that name can be improved but busy may give it a different
meaning. Maybe sched_select_non_idle_cpu()?

Thanks for your instantaneous review :)
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