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

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Date:   Thu, 23 Jan 2020 20:15:47 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thara Gopinath <thara.gopinath@...aro.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 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.

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.

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