linux-kernel - Re: [PATCH v6 3/6] sched: add utilization_avg

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Date:	Fri, 3 Oct 2014 16:44:59 +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>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Rik van Riel <riel@...hat.com>,
	Morten Rasmussen <Morten.Rasmussen@....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 v6 3/6] sched: add utilization_avg_contrib

On 3 October 2014 16:15, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Sep 23, 2014 at 06:08:02PM +0200, Vincent Guittot wrote:
>>  struct sched_avg {
>> +     u64 last_runnable_update;
>> +     s64 decay_count;
>> +     /*
>> +      * utilization_avg_contrib describes the amount of time that a
>> +      * sched_entity is running on a CPU. It is based on running_avg_sum
>> +      * and is scaled in the range [0..SCHED_LOAD_SCALE].
>> +      * load_avg_contrib described the the amount of time that a
>> +      * sched_entity is runnable on a rq. It is based on both
>> +      * runnable_avg_sum and the weight of the task.
>> +      */
>> +     unsigned long load_avg_contrib, utilization_avg_contrib;
>>       /*
>>        * These sums represent an infinite geometric series and so are bound
>>        * above by 1024/(1-y).  Thus we only need a u32 to store them for all
>>        * choices of y < 1-2^(-32)*1024.
>> +      * runnable_avg_sum represents the amount of time a sched_entity is on
>> +      * the runqueue whereas running_avg_sum reflects the time the
>> +      * sched_entity is effectively running on the runqueue.
>
> I would say: 'running on the cpu'. I would further clarify that runnable
> also includes running, the above could be read such that runnable is
> only the time spend waiting on the queue, excluding the time spend on
> the cpu.

ok

>
>>        */
>> +     u32 runnable_avg_sum, avg_period, running_avg_sum;
>>  };
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