linux-kernel - Re: [PATCH v4 12/18] PM: EM: Use runtime modified EM for CPUs energy estimation in EAS

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Message-ID: <610b6c7d-59f5-447b-c477-d532b1d00e3c@arm.com>
Date:   Fri, 29 Sep 2023 11:10:08 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        dietmar.eggemann@....com, rui.zhang@...el.com,
        amit.kucheria@...durent.com, amit.kachhap@...il.com,
        daniel.lezcano@...aro.org, viresh.kumar@...aro.org,
        len.brown@...el.com, pavel@....cz, mhiramat@...nel.org,
        qyousef@...alina.io, wvw@...gle.com
Subject: Re: [PATCH v4 12/18] PM: EM: Use runtime modified EM for CPUs energy
 estimation in EAS



On 9/26/23 20:54, Rafael J. Wysocki wrote:
> On Mon, Sep 25, 2023 at 10:11 AM Lukasz Luba <lukasz.luba@....com> wrote:
>>
>> The new Energy Model (EM) supports runtime modification of the performance
>> state table to better model the power used by the SoC. Use this new
>> feature to improve energy estimation and therefore task placement in
>> Energy Aware Scheduler (EAS).
>>
>> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
>> ---
>>   include/linux/energy_model.h | 20 +++++++++++++-------
>>   1 file changed, 13 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
>> index 8f055ab356ed..41290ee2cdd0 100644
>> --- a/include/linux/energy_model.h
>> +++ b/include/linux/energy_model.h
>> @@ -261,15 +261,14 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
>>                                  unsigned long max_util, unsigned long sum_util,
>>                                  unsigned long allowed_cpu_cap)
>>   {
>> +       struct em_perf_table *runtime_table;
> 
> You may as well call it just "table".  The "runtime_" prefix doesn't
> add much value here IMO.

Yes, I'll do that

Thank you Rafael for the review of the patch set!

Regards,
Lukasz