linux-kernel - Re: Re: [PATCH 2/2] sched/fair: Fix premature check of WAKEUP

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Message-ID: <ffda0c9a-0794-4080-921f-99f0c31e2d6c@bytedance.com>
Date: Tue, 25 Feb 2025 14:29:29 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Juri Lelli <juri.lelli@...hat.com>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Josh Don <joshdon@...gle.com>, Tianchen Ding <dtcccc@...ux.alibaba.com>,
 "open list:SCHEDULER" <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH 2/2] sched/fair: Fix premature check of
 WAKEUP_PREEMPTION

On 2/24/25 9:47 PM, Vincent Guittot wrote:
> 
> Or we should just remove it. I'm curious to know who used it during
> the last couple of years ? Having in mind that lazy preemption adds

TBH I have never used this feature. But since Phil mentioned a case
in debugging DELAY_DEQUEUE, I think we'd better keep it, what do you
think?

> another level as check_preempt_wakeup_fair()  uses it so sched-idle
> tasks might not always be immediately preempted anyway.

Right, thanks for mention that.

> 
> 
>>
>> Thanks,
>>          Abel
>>