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Date:   Thu, 8 Sep 2022 08:50:09 +0200
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Subject: Re: [RFC PATCH 1/1] sched/pelt: Introduce PELT multiplier
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To:     Vincent Guittot <vincent.guittot@linaro.org>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Vincent Donnefort <vdonnefort@google.com>,
        Quentin Perret <qperret@google.com>,
        Patrick Bellasi <patrick.bellasi@matbug.net>,
        Abhijeet Dharmapurikar <adharmap@quicinc.com>,
        Jian-Min <Jian-Min.Liu@mediatek.com>,
        Qais Yousef <qais.yousef@arm.com>, linux-kernel@vger.kernel.org
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From:   Dietmar Eggemann <dietmar.eggemann@arm.com>
In-Reply-To: <CAKfTPtCN6fmTZ8mvDWP80_KF2CVdv8AkyB=VKvSvD_HH19ZwVg@mail.gmail.com>
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On 06/09/2022 07:49, Vincent Guittot wrote:
> On Fri, 2 Sept 2022 at 09:54, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
>>
>> On 29/08/2022 12:13, Vincent Guittot wrote:
>>> On Mon, 29 Aug 2022 at 12:03, Peter Zijlstra <peterz@infradead.org> wrote:
>>>>
>>>> On Mon, Aug 29, 2022 at 10:08:13AM +0200, Peter Zijlstra wrote:
>>>>> On Mon, Aug 29, 2022 at 07:54:50AM +0200, Dietmar Eggemann wrote:
>>>>>> From: Vincent Donnefort <vincent.donnefort@arm.com>

[...]

>> We still need rq_clock_task_mult(rq), i.e. `rq->clock_task_mult` in
>> _update_idle_rq_clock_pelt() though.
> 
> Why ? If the mult is defined at boot we just have to use
> "rq_clock_task(rq) << mult" instead of rq_clock_task(rq) when updating
> clock_pelt

Makes sense! Agreed.