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

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Message-ID: <1d2ad284-c887-4377-9512-a74dc418efa1@linux.alibaba.com>
Date: Thu, 14 Nov 2024 15:47:09 +0800
From: Tianchen Ding <dtcccc@...ux.alibaba.com>
To: 解 咏梅 <xieym_ict@...mail.com>
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>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sched/eevdf: Force propagating min_slice of cfs_rq
 when a task changing slice

On 2024/11/14 15:33, 解 咏梅 wrote:
> delayed dequeue is nessary for eevdf to maintain lag. Paw’s relative vruntime is 
> not necessary any more in migration path.
> 
> 
> it is not a tuning option.
> 
> regards,
> Yongmei

I don't know why you so focus on DELAY_DEQUEUE, it is not related to the case I 
explained.

The case is about cgroup hierarchy. And the task_A in my case is already blocked 
and *out of rq*

I'm talking about its enqueue path when woken up.