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From: Vincent Guittot <vincent.guittot@linaro.org>
To: "Michal Koutný" <mkoutny@suse.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
	Phil Auld <pauld@redhat.com>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	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>,
	Odin Ugedal <odin@uged.al>, Rik van Riel <riel@surriel.com>,
	Giovanni Gherdovich <ggherdovich@suse.cz>
Subject: Re: [RFC PATCH v2 4/5] sched/fair: Simplify load_cfs_rq_list maintenance
Date: Wed, 15 Sep 2021 14:30:56 +0200	[thread overview]
Message-ID: <CAKfTPtC5+4gf_R0bAVHe+0Fw6dQYQ_a-f529H9s4KLpm40X9Ng@mail.gmail.com> (raw)
In-Reply-To: <CAKfTPtDw6_iMxGyCK8vrwgV-zMyHtNKBksxs3OpbpK=houzp2g@mail.gmail.com>

On Tue, 14 Sept 2021 at 11:45, Vincent Guittot
<vincent.guittot@linaro.org> wrote:
>
> On Tue, 14 Sept 2021 at 11:22, Michal Koutný <mkoutny@suse.com> wrote:
> >
> > On Fri, Sep 10, 2021 at 04:19:27PM +0200, Vincent Guittot <vincent.guittot@linaro.org> wrote:
> > > Your proposal looks interesting but I need more time to make sure that
> > > all cases are covered. We have faced several odd corner cases and
> > > sequences in the past that I need time to check that you don't put
> > > some back
> >
> > Do you have any pointers to the cases that come to your mind? I wonder
> > if those could be reproduced with a simple setup.
>
> I don't have a strict list but several warnings for leaf_list have
> been already reported on lkml in the past and the use cases were quite
> complicated and I want to go through them to make sure they are still
> covered.

The corner cases that I wanted to check, are covered by
a7b359fc6a37 ("sched/fair: Correctly insert cfs_rq's to list on unthrottle")
and
fdaba61ef8a2 ("sched/fair: Ensure that the CFS parent is added after
unthrottling")

This patch looks ok to me.
Also, propagate_entity_cfs_rq() could also get advantage of the same
kind of change

>
> Vincent
>
> > (FTR, I used the LTP test (at b673f49ae) cfs_bandwidth01 to check this change.)
> >
> > Thanks,
> > Michal

  reply	other threads:[~2021-09-15 12:31 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19 17:50 [RFC PATCH v2 0/5] leaf_cfs_rq_list cleanups and fix Michal Koutný
2021-08-19 17:50 ` [RFC PATCH v2 1/5] sched/fair: Add ancestors of unthrottled undecayed cfs_rq Michal Koutný
2021-09-09 13:57   ` Vincent Guittot
2021-09-10 11:35     ` Michal Koutný
2021-09-10 13:17       ` Vincent Guittot
2021-08-19 17:50 ` [RFC PATCH v2 2/5] sched: Add group_se() helper Michal Koutný
2021-08-19 17:50 ` [RFC PATCH v2 3/5] sched/fair: Rename leaf_list to more fitting load_list Michal Koutný
2021-09-21 19:06   ` Odin Ugedal
2021-08-19 17:50 ` [RFC PATCH v2 4/5] sched/fair: Simplify load_cfs_rq_list maintenance Michal Koutný
2021-09-10 14:19   ` Vincent Guittot
2021-09-14  9:22     ` Michal Koutný
2021-09-14  9:45       ` Vincent Guittot
2021-09-15 12:30         ` Vincent Guittot [this message]
2021-09-15 18:59           ` Odin Ugedal
2021-09-21 19:21             ` Odin Ugedal
2021-09-21 21:40               ` Michal Koutný
2021-08-19 17:50 ` [RFC PATCH v2 5/5] sched/fair: Simplify ancestor enqueue loops Michal Koutný
2021-09-09 14:04   ` Vincent Guittot
2021-09-10 11:35     ` Michal Koutný
2021-09-10 11:43       ` Vincent Guittot

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