From: Qais Yousef <qyousef@layalina.io>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
Lukasz Luba <lukasz.luba@arm.com>, Wei Wang <wvw@google.com>,
Rick Yiu <rickyiu@google.com>,
Chung-Kai Mei <chungkai@google.com>,
Hongyan Xia <hongyan.xia2@arm.com>
Subject: Re: [PATCH 1/4] sched/fair: Be less aggressive in calling cpufreq_update_util()
Date: Tue, 12 Dec 2023 12:40:37 +0000 [thread overview]
Message-ID: <20231212124037.at47izy5xp6lsxh2@airbuntu> (raw)
In-Reply-To: <CAKfTPtAKainBfpPOKTJ21zQmmYw7O0Z0v8utfg=QTBtE1L5O_w@mail.gmail.com>
On 12/12/23 12:06, Vincent Guittot wrote:
> > @@ -6772,6 +6737,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
> > enqueue_throttle:
> > assert_list_leaf_cfs_rq(rq);
> >
>
> Here and in the other places below, you lose :
>
> - } else if (decayed) {
>
> The decayed condition ensures a rate limit (~1ms) in the number of
> calls to cpufreq_update_util.
>
> enqueue/dequeue/tick don't create any sudden change in the PELT
> signals that would require to update cpufreq of the change unlike
> attach/detach
Okay, thanks for the clue. Let me rethink this again.
Cheers
--
Qais Yousef
next prev parent reply other threads:[~2023-12-12 12:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-08 1:52 [PATCH 0/4] sched: cpufreq: Remove uclamp max-aggregation Qais Yousef
2023-12-08 1:52 ` [PATCH 1/4] sched/fair: Be less aggressive in calling cpufreq_update_util() Qais Yousef
2023-12-08 10:05 ` Lukasz Luba
2023-12-10 20:51 ` Qais Yousef
2023-12-11 7:56 ` Lukasz Luba
2023-12-12 12:10 ` Qais Yousef
2023-12-14 8:19 ` Lukasz Luba
2023-12-11 18:47 ` Christian Loehle
2023-12-12 12:34 ` Qais Yousef
2023-12-12 13:09 ` Christian Loehle
2023-12-12 13:29 ` Qais Yousef
2023-12-12 10:46 ` Dietmar Eggemann
2023-12-12 12:35 ` Qais Yousef
2023-12-12 18:22 ` Hongyan Xia
2023-12-12 10:47 ` Hongyan Xia
2023-12-12 11:06 ` Vincent Guittot
2023-12-12 12:40 ` Qais Yousef [this message]
2023-12-29 0:25 ` Qais Yousef
2024-01-03 13:41 ` Vincent Guittot
2024-01-04 19:40 ` Qais Yousef
2023-12-18 8:51 ` Dietmar Eggemann
2023-12-17 21:44 ` Qais Yousef
2023-12-08 1:52 ` [PATCH 2/4] sched/uclamp: Remove rq max aggregation Qais Yousef
2023-12-11 0:08 ` Qais Yousef
2023-12-08 1:52 ` [PATCH 3/4] sched/schedutil: Ignore update requests for short running tasks Qais Yousef
2023-12-08 10:42 ` Hongyan Xia
2023-12-10 22:22 ` Qais Yousef
2023-12-11 11:15 ` Hongyan Xia
2023-12-12 12:23 ` Qais Yousef
2023-12-08 1:52 ` [PATCH 4/4] sched/documentation: Remove reference to max aggregation Qais Yousef
2023-12-18 8:19 ` [PATCH 0/4] sched: cpufreq: Remove uclamp max-aggregation Dietmar Eggemann
2023-12-17 21:23 ` Qais Yousef
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