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From: Odin Ugedal <odin@uged.al>
To: Tao Zhou <tao.zhou@linux.dev>
Cc: "Odin Ugedal" <odin@uged.al>, "Michal Koutný" <mkoutny@suse.com>,
	"open list" <linux-kernel@vger.kernel.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Juri Lelli" <juri.lelli@redhat.com>,
	"Vincent Guittot" <vincent.guittot@linaro.org>,
	"Dietmar Eggemann" <dietmar.eggemann@arm.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Ben Segall" <bsegall@google.com>, "Mel Gorman" <mgorman@suse.de>,
	"Daniel Bristot de Oliveira" <bristot@redhat.com>
Subject: Re: [PATCH] sched/fair: Use rq->lock when checking cfs_rq list presence
Date: Wed, 13 Oct 2021 19:52:34 +0100	[thread overview]
Message-ID: <CAFpoUr1AO_qStNOYrFWGnFfc=uSFrXSYD8A5cQ8h0t2pioQzDA@mail.gmail.com> (raw)
In-Reply-To: <YWXUuXsA+1nNjZYN@geo.homenetwork>

Hi,

tir. 12. okt. 2021 kl. 19:31 skrev Tao Zhou <tao.zhou@linux.dev>:
>
> Er.. this is considered specific to this fix I think. Normal unthrottle(not
> race with delete, avg maybe used in after) also need the normal avg decay.

Yeah, it was more meant as a way to express my idea, should probably have
said that more explicitly. It would essentially be a revert of a7b359fc6a37
("sched/fair: Correctly insert cfs_rq's to list on unthrottle"),
while "temporary" fixing the problem it fixed, by removing the load from the tg.

But yeah, it would still need to decay the load properly to _actually_ be fully
correct and work as it does today. But in most cases nr_running>0 on unthrottle,
but yeah, it is definitely not always the case.

Thanks
Odin

  reply	other threads:[~2021-10-13 18:52 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-11 17:22 [PATCH] sched/fair: Use rq->lock when checking cfs_rq list presence Michal Koutný
2021-10-11 19:12 ` Odin Ugedal
2021-10-12 18:32   ` Tao Zhou
2021-10-13 18:52     ` Odin Ugedal [this message]
2021-10-13 14:39   ` Michal Koutný
2021-10-13 18:45     ` Odin Ugedal
2021-10-13  7:57 ` Vincent Guittot
2021-10-13 14:26   ` Michal Koutný
2021-11-02 16:02     ` task_group unthrottling and removal race (was Re: [PATCH] sched/fair: Use rq->lock when checking cfs_rq list) presence Michal Koutný
2021-11-02 20:20       ` Odin Ugedal
2021-11-03  9:51       ` Mathias Krause
2021-11-03 10:51         ` Mathias Krause
2021-11-03 11:10           ` Michal Koutný
2021-11-03 14:16             ` Mathias Krause
2021-11-03 19:06               ` [PATCH] sched/fair: Prevent dead task groups from regaining cfs_rq's Mathias Krause
2021-11-03 22:03                 ` Benjamin Segall
2021-11-04  8:50                   ` Vincent Guittot
2021-11-04 15:13                     ` Mathias Krause
2021-11-04 16:49                       ` Vincent Guittot
2021-11-04 17:37                         ` Mathias Krause
2021-11-05 14:25                           ` Vincent Guittot
2021-11-05 14:44                             ` Mathias Krause
2021-11-05 16:29                               ` Mathias Krause
2021-11-05 16:58                                 ` Peter Zijlstra
2021-11-05 17:14                                   ` Mathias Krause
2021-11-05 17:27                                     ` Peter Zijlstra
2021-11-05 17:40                                       ` Mathias Krause
2021-11-06 10:48                                 ` Peter Zijlstra
2021-11-08 10:27                                   ` Mathias Krause
2021-11-08 11:40                                     ` Peter Zijlstra
2021-11-08 15:06                                       ` Mathias Krause
2021-11-10 15:14                                         ` Vincent Guittot
2021-11-09 18:47                                       ` Michal Koutný
2021-11-10 15:17                                         ` Vincent Guittot
2021-11-04 20:46                       ` Benjamin Segall
2021-11-04 18:49                 ` Michal Koutný
2021-11-05 14:55                   ` Mathias Krause
2021-11-05 14:58                 ` Peter Zijlstra

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