linux-kernel - Re: [PATCH v2 1/3] sched/uclamp: Set max_spare_cap_cpu even if max_spare

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Message-ID: <20230223151346.pzqtbjzoqgkak3g2@airbuntu>
Date:   Thu, 23 Feb 2023 15:13:46 +0000
From:   Qais Yousef <qyousef@...alina.io>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        linux-kernel@...r.kernel.org, Lukasz Luba <lukasz.luba@....com>,
        Wei Wang <wvw@...gle.com>, Xuewen Yan <xuewen.yan94@...il.com>,
        Hank <han.lin@...iatek.com>,
        Jonathan JMChen <Jonathan.JMChen@...iatek.com>
Subject: Re: [PATCH v2 1/3] sched/uclamp: Set max_spare_cap_cpu even if
 max_spare_cap is 0

On 02/22/23 11:59, Vincent Guittot wrote:

> I haven't looked too much at uclamp_max impact in energy calculation.
> Nevertheless, I wonder if one solution could be to not clamp the
> utilization to cpu max capacity in this case. The fact that
> utilization can go above cpu capacity when we clamp its frequency
> reflect that it would need more compute capacity or it will run
> longer. I will try to look more deeply in this use case

Okay thanks!


--
Qais Yousef