linux-kernel - Re: [Patch v8 1/7] sched/pelt: Add support to track thermal pressure

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Message-ID: <5E2B405A.7040405@linaro.org>
Date:   Fri, 24 Jan 2020 14:07:06 -0500
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, ionela.voinescu@....com,
        vincent.guittot@...aro.org, rui.zhang@...el.com,
        qperret@...gle.com, daniel.lezcano@...aro.org,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        amit.kachhap@...il.com, javi.merino@...nel.org,
        amit.kucheria@...durent.com
Subject: Re: [Patch v8 1/7] sched/pelt: Add support to track thermal pressure

On 01/23/2020 02:15 PM, Dietmar Eggemann wrote:
> On 16/01/2020 16:17, Peter Zijlstra wrote:
>> On Tue, Jan 14, 2020 at 02:57:33PM -0500, Thara Gopinath wrote:
>>
>>> diff --git a/kernel/sched/pelt.h b/kernel/sched/pelt.h
>>> index afff644..bf1e17b 100644
>>> --- a/kernel/sched/pelt.h
>>> +++ b/kernel/sched/pelt.h
>>> @@ -7,6 +7,16 @@ int __update_load_avg_cfs_rq(u64 now, struct cfs_rq *cfs_rq);
>>>  int update_rt_rq_load_avg(u64 now, struct rq *rq, int running);
>>>  int update_dl_rq_load_avg(u64 now, struct rq *rq, int running);
>>>  
>>> +#ifdef CONFIG_HAVE_SCHED_THERMAL_PRESSURE
> 
> I assume your plan is to enable this for Arm and Arm64? Otherwise the
> code in 3/7 should also be guarded by this.

Yes. I think it should be enabled for arm and arm64. I can submit a
patch after this series is accepted to enable it.
Nevertheless , I don't understand why is patch 3/7 tied with this.
This portion is the averaging of thermal pressure. Patch 3/7 is to store
and retrieve the instantaneous value.
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index e688dfad0b72..9eb414b2c8b9 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -164,6 +164,7 @@ config ARM64
>         select HAVE_FUNCTION_ARG_ACCESS_API
>         select HAVE_RCU_TABLE_FREE
>         select HAVE_RSEQ
> +       select HAVE_SCHED_THERMAL_PRESSURE
>         select HAVE_STACKPROTECTOR
>         select HAVE_SYSCALL_TRACEPOINTS
> 
> Currently it lives in the 'CPU/Task time and stats accounting' of
> .config which doesn't feel right to me.

It is cpu statistics if you think about it. It is also the same .config
where CONFIG_HAVE_SCHED_AVG_IRQ is defined.
> 
> [...]
> 


-- 
Warm Regards
Thara