linux-kernel - Re: [Patch v5 6/6] sched/fair: Enable tuning of decay period

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Date:   Fri, 8 Nov 2019 11:53:05 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>,
        Thara Gopinath <thara.gopinath@...aro.org>
Cc:     mingo@...hat.com, peterz@...radead.org, ionela.voinescu@....com,
        rui.zhang@...el.com, edubezval@...il.com, qperret@...gle.com,
        linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
        javi.merino@...nel.org, daniel.lezcano@...aro.org
Subject: Re: [Patch v5 6/6] sched/fair: Enable tuning of decay period

On 07/11/2019 11:49, Vincent Guittot wrote:
> Le Tuesday 05 Nov 2019 à 13:49:46 (-0500), Thara Gopinath a écrit :

[...]

>>  /**
>> @@ -10444,8 +10465,8 @@ void update_thermal_pressure(int cpu, unsigned long capped_capacity)
>>  static void trigger_thermal_pressure_average(struct rq *rq)
>>  {
>>  #ifdef CONFIG_SMP
>> -	update_thermal_load_avg(rq_clock_task(rq), rq,
>> -				per_cpu(thermal_pressure, cpu_of(rq)));
>> +	update_thermal_load_avg(rq_clock_task(rq) >> sched_thermal_decay_shift,
>> +				rq, per_cpu(thermal_pressure, cpu_of(rq)));
> 
> Would be better to create
> 
> +static inline u64 rq_clock_thermal(struct rq *rq)
> +{
> +       lockdep_assert_held(&rq->lock);
> +       assert_clock_updated(rq);

IMHO, the asserts can be skipped here since they're already done in
rq_clock_task().

> +       return rq_clock_task(rq) >> sched_thermal_decay_shift;
> +}