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SubjectRe: [Patch v9 5/8] sched/fair: update cpu_capacity to reflect thermal pressure
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On 02/13/2020 07:47 AM, Amit Kucheria wrote:
> On Wed, Jan 29, 2020 at 4:06 AM Thara Gopinath
> <thara.gopinath@linaro.org> wrote:
>>
>> cpu_capacity initially reflects the maximum possible capacity of a cpu.
>> Thermal pressure on a cpu means this maximum possible capacity is
>> unavailable due to thermal events. This patch subtracts the average thermal
>> pressure for a cpu from its maximum possible capacity so that cpu_capacity
>> reflects the actual maximum currently available capacity.
>>
>> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
>> ---
>>
>> v8->v9:
>> - Use thermal_load_avg to read rq->avg_thermal.load_avg.
>>
>> kernel/sched/fair.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index 5f58c03..d879077 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -7753,8 +7753,15 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
>> if (unlikely(irq >= max))
>> return 1;
>>
>> + /*
>> + * avg_rt.util avg and avg_dl.util track binary signals
>
> For avg_rt, s/util avg/util_avg/
> For avg_dl, s/util/util_avg/ ?

Yep. Will fix it.

>
>> + * (running and not running) with weights 0 and 1024 respectively.
>> + * avg_thermal.load_avg tracks thermal pressure and the weighted
>> + * average uses the actual delta max capacity(load).
>> + */
>> used = READ_ONCE(rq->avg_rt.util_avg);
>> used += READ_ONCE(rq->avg_dl.util_avg);
>> + used += thermal_load_avg(rq);
>>
>> if (unlikely(used >= max))
>> return 1;
>> --
>> 2.1.4
>>


--
Warm Regards
Thara

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