linux-kernel - Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

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Message-ID: <614a9238-0aaa-464d-a78b-b0b4f646a30b@arm.com>
Date: Thu, 5 Sep 2024 16:50:24 +0200
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Hongyan Xia <hongyan.xia2@....com>, Luis Machado <luis.machado@....com>,
 Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
 juri.lelli@...hat.com, rostedt@...dmis.org, bsegall@...gle.com,
 mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org,
 kprateek.nayak@....com, wuyun.abel@...edance.com, youssefesmat@...omium.org,
 tglx@...utronix.de, efault@....de
Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

On 05/09/2024 16:29, Vincent Guittot wrote:
> On Thu, 5 Sept 2024 at 16:07, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
>>
>> On 05/09/2024 15:33, Vincent Guittot wrote:
>>> On Thu, 5 Sept 2024 at 15:02, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
>>>>
>>>> On 29/08/2024 17:42, Hongyan Xia wrote:
>>>>> On 22/08/2024 15:58, Vincent Guittot wrote:
>>>>>> On Thu, 22 Aug 2024 at 14:10, Vincent Guittot
>>>>>> <vincent.guittot@...aro.org> wrote:
>>>>>>>
>>>>>>> On Thu, 22 Aug 2024 at 14:08, Luis Machado <luis.machado@....com> wrote:
>>>>>>>>
>>>>>>>> Vincent,
>>>>>>>>
>>>>>>>> On 8/22/24 11:28, Luis Machado wrote:
>>>>>>>>> On 8/22/24 10:53, Vincent Guittot wrote:
>>>>>>>>>> On Thu, 22 Aug 2024 at 11:22, Luis Machado <luis.machado@....com>
>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>> On 8/22/24 09:19, Vincent Guittot wrote:
>>>>>>>>>>>> Hi,
>>>>>>>>>>>>
>>>>>>>>>>>> On Wed, 21 Aug 2024 at 15:34, Hongyan Xia <hongyan.xia2@....com>

[...]

>> My hope was we can fix util_est independently since it drives CPU
>> frequency. Whereas PELT load_avg and runnable_avg are "only" used for
>> load balancing. But I agree, it has to be fixed as well.
> 
> runnable_avg is also used for frequency selection

Ah, yes. So we would need proper cfs_rq->h_nr_running accounting as well.