linux-kernel - Re: [PATCH v3 0/2] Fix SCHED_IDLE behavior on wakeup preemption

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Message-ID: <5bad2c2d-8e5d-492b-be24-c61c43499f64@bytedance.com>
Date: Fri, 21 Mar 2025 17:42:33 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: K Prateek Nayak <kprateek.nayak@....com>,
 Madadi Vineeth Reddy <vineethr@...ux.ibm.com>, Phil Auld <pauld@...hat.com>,
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 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>
Cc: "open list:SCHEDULER" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/2] Fix SCHED_IDLE behavior on wakeup preemption

Ping.. Can this series be merged, pls?

On 3/7/25 11:21 AM, Abel Wu wrote:
> The commit 6bc912b71b6f ("sched: SCHED_OTHER vs SCHED_IDLE isolation")
> defines the behavior of SCHED_IDLE as following:
> 
>   - no SCHED_IDLE buddies
>   - never let SCHED_IDLE preempt on wakeup
>   - always preempt SCHED_IDLE on wakeup
>   - limit SLEEPER fairness for SCHED_IDLE
> 
> and the middle two of them are broken now.
> 
> v3:
>   - Collect Tested-by and Acked-by from K Nayak and Vincent, thanks!
> 
> v2:
>   - Collect Reviewed-by tags from Vincent, Josh and Madadi, thanks!
>   - Rebased to up-to-date tip. (Madadi)
>   - Folded some discussion with Vincent into commit log.
> 
> Abel Wu (2):
>    sched/fair: Do not let idle entities preempt others
>    sched/fair: Fix premature check of WAKEUP_PREEMPTION
> 
>   kernel/sched/fair.c | 14 ++++++++------
>   1 file changed, 8 insertions(+), 6 deletions(-)
>