linux-kernel - Re: [PATCH v7 5/7] sched: get CPU's usage statistic

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Date:	Fri, 10 Oct 2014 16:38:06 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>
Subject: Re: [PATCH v7 5/7] sched: get CPU's usage statistic

On 9 October 2014 17:12, Peter Zijlstra <peterz@...radead.org> wrote:

>> >> +static int get_cpu_usage(int cpu)
>> >> +{
>> >> +     unsigned long usage = cpu_rq(cpu)->cfs.utilization_load_avg;
>> >> +     unsigned long capacity = capacity_orig_of(cpu);
>> >> +
>> >> +     if (usage >= SCHED_LOAD_SCALE)
>> >> +             return capacity + 1;
>> >
>> > Like Morten I'm confused by that +1 thing.
>>
>> ok. the goal was to point out the erroneous case where usage is out of
>> the range but if it generates confusion, it can remove it
>
> Well, the fact that you clip makes that point, returning a value outside
> of the specified range doesn't.

i meant removing the +1
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