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SubjectRe: [Patch v6 4/7] sched/fair: Enable periodic update of average thermal pressure
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On 12/17/2019 07:57 AM, Dietmar Eggemann wrote:
> On 16/12/2019 18:59, Quentin Perret wrote:
>> On Monday 16 Dec 2019 at 15:39:32 (+0100), Peter Zijlstra wrote:
>>>> @@ -10274,6 +10281,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
>>>>
>>>> update_misfit_status(curr, rq);
>>>> update_overutilized_status(task_rq(curr));
>>>> + update_thermal_load_avg(rq_clock_task(rq), rq, thermal_pressure);
>>>> }
>>>
>>> My objection here is that when the arch does not have support for it,
>>> there is still code generated and runtime overhead associated with it.
>>
>> I guess this function could be stubbed for CONFIG_CPU_THERMAL=n ?
>> That is, reflecting the thermal pressure in the scheduler only makes
>> sense when the thermal infrastructure is enabled to begin with (which is
>> indeed not the case for most archs).
>
> Makes sense to me. If we can agree that 'CPU cooling' is the only actor
> for thermal (CPU capacity) capping.
>
> thermal_sys-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
>

Hi All,
Thanks for all the reviews!

The other option will be to have a separate
CONFIG_HAVE_SCHED_THERMAL_PRESSURE. This will ensure that we are not
tied to cpu cooling thermal infrastructure. What say?
There is a CONFIG_HAVE_SCHED_AVG_IRQ for irq load average in pelt.c.


--
Warm Regards
Thara

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