linux-kernel - Re: [PATCH v2] sched/eevdf: Force propagating min_slice of cfs

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Message-ID: <2c4654d1-f212-43ac-abf9-de6d08c85387@linux.alibaba.com>
Date: Tue, 12 Nov 2024 11:25:00 +0800
From: Tianchen Ding <dtcccc@...ux.alibaba.com>
To: linux-kernel@...r.kernel.org
Cc: 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>
Subject: Re: [PATCH v2] sched/eevdf: Force propagating min_slice of cfs_rq
 when a task changing slice

On 2024/10/31 17:48, Tianchen Ding wrote:
> When a task changes slice and its cgroup se is already on_rq, the cgroup
> se will not be enqueued again, and hence the root->min_slice leaves
> unchanged.
> 
> Force propagating it when se doesn't need to be enqueued (or dequeued).
> Ensure the se hierarchy always get the latest min_slice.
> 
> Fixes: aef6987d8954 ("sched/eevdf: Propagate min_slice up the cgroup hierarchy")
> Signed-off-by: Tianchen Ding <dtcccc@...ux.alibaba.com>

ping for this fix.