linux-kernel - Re: [PATCH v4 00/18] Introduce runtime modifiable Energy Model

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Message-ID: <4cf233b1-57e0-f1f0-4def-1cbb7bf46e9f@arm.com>
Date:   Tue, 3 Oct 2023 09:06:41 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Qais Yousef <qyousef@...alina.io>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        rafael@...nel.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,
        wvw@...gle.com
Subject: Re: [PATCH v4 00/18] Introduce runtime modifiable Energy Model

Hi Qais,


On 9/28/23 22:56, Qais Yousef wrote:
> Hi Lukasz
> 
> On 09/25/23 09:11, Lukasz Luba wrote:
>> Hi all,
>>
>> This patch set adds a new feature which allows to modify Energy Model (EM)
>> power values at runtime. It will allow to better reflect power model of
>> a recent SoCs and silicon. Different characteristics of the power usage
>> can be leveraged and thus better decisions made during task placement in EAS.
>>
>> It's part of feature set know as Dynamic Energy Model. It has been presented
>> and discussed recently at OSPM2023 [3]. This patch set implements the 1st
>> improvement for the EM.
> 
> Thanks for the series! I'm on CC this time :-) Unfortunately I have a planned
> holiday starting tomorrow, so won't get a chance to do proper review till I'm
> back which would be few weeks from now.
> 
> I just want to iterate that this is a real problem being seen in practice where
> it's hard to provide a single average EM for all workloads now. So we certainly
> need something like this.
> 
> Hopefully I'll get a chance to help with review when I'm back from holidays.
> 
> 

Thanks and no worries, there will be v5. I am going to address comments
from Rafael. So probably when you're back the v5 would be there then.

Regards,
Lukasz