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From: Peter Zijlstra <peterz@infradead.org>
To: Kajetan Puchalski <kajetan.puchalski@arm.com>
Cc: Jian-Min Liu <jian-min.liu@mediatek.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Ingo Molnar <mingo@kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Vincent Donnefort <vdonnefort@google.com>,
	Quentin Perret <qperret@google.com>,
	Patrick Bellasi <patrick.bellasi@matbug.net>,
	Abhijeet Dharmapurikar <adharmap@quicinc.com>,
	Qais Yousef <qais.yousef@arm.com>,
	linux-kernel@vger.kernel.org,
	Jonathan JMChen <jonathan.jmchen@mediatek.com>
Subject: Re: [RFC PATCH 0/1] sched/pelt: Change PELT halflife at runtime
Date: Thu, 29 Sep 2022 13:21:45 +0200	[thread overview]
Message-ID: <YzV/yT6OYMgaq0kD@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YzV9Gejo/+DL3UjK@e126311.manchester.arm.com>

On Thu, Sep 29, 2022 at 12:10:17PM +0100, Kajetan Puchalski wrote:

> Overall, the problem being solved here is that based on our testing the
> PELT half life can occasionally be too slow to keep up in scenarios
> where many frames need to be rendered quickly, especially on high-refresh
> rate phones and similar devices.

But it is a problem of DVFS not ramping up quick enough; or of the
load-balancer not reacting to the increase in load, or what aspect
controlled by PELT is responsible for the improvement seen?

  reply	other threads:[~2022-09-29 11:22 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-29  5:54 [RFC PATCH 0/1] sched/pelt: Change PELT halflife at runtime Dietmar Eggemann
2022-08-29  5:54 ` [RFC PATCH 1/1] sched/pelt: Introduce PELT multiplier Dietmar Eggemann
2022-08-29  8:08   ` Peter Zijlstra
2022-08-29 10:02     ` Peter Zijlstra
2022-08-29 10:13       ` Vincent Guittot
2022-08-29 14:23         ` Quentin Perret
2022-08-29 14:34           ` Peter Zijlstra
2022-08-29 15:31             ` Quentin Perret
2022-08-29 15:48             ` Quentin Perret
2022-09-02  7:53         ` Dietmar Eggemann
2022-09-02  8:45           ` Peter Zijlstra
2022-09-06  5:49           ` Vincent Guittot
2022-09-08  6:50             ` Dietmar Eggemann
2022-09-02  7:53       ` Dietmar Eggemann
2022-09-02  8:45         ` Peter Zijlstra
2022-09-20 14:07 ` [RFC PATCH 0/1] sched/pelt: Change PELT halflife at runtime Jian-Min Liu
2022-09-28 17:09   ` Dietmar Eggemann
2022-09-29  9:47   ` Peter Zijlstra
2022-09-29 11:07     ` Dietmar Eggemann
2022-09-29 11:10     ` Kajetan Puchalski
2022-09-29 11:21       ` Peter Zijlstra [this message]
2022-09-29 14:41         ` Kajetan Puchalski
2022-10-03 22:57           ` Wei Wang
2022-10-04  9:33             ` Dietmar Eggemann
2022-10-05 16:57               ` Wei Wang
2022-11-07 13:41           ` Peter Zijlstra
2022-11-08 19:48             ` Qais Yousef
2022-11-09 15:49               ` Peter Zijlstra
2022-11-10 13:25                 ` Qais Yousef
2023-02-07 10:29                 ` Dietmar Eggemann
2023-02-09 16:16                   ` Vincent Guittot
2023-02-17 13:54                     ` Dietmar Eggemann
2023-02-20 13:54                       ` Vincent Guittot
2023-02-21  9:29                         ` Vincent Guittot
2023-02-22 20:28                           ` Dietmar Eggemann
2023-03-01 10:24                             ` Vincent Guittot
2023-02-22 20:13                         ` Dietmar Eggemann
2023-03-02 19:36                           ` Dietmar Eggemann
2023-02-20 10:13                     ` Peter Zijlstra
2023-02-20 13:39                       ` Vincent Guittot
2023-02-23 15:37                     ` Qais Yousef
2023-03-01 10:39                       ` Vincent Guittot
2023-03-01 17:24                         ` Qais Yousef
2023-03-02  8:00                           ` Vincent Guittot
2023-03-02 19:39                             ` Dietmar Eggemann
2023-03-06 19:11                             ` Qais Yousef
2023-03-07 13:22                               ` Vincent Guittot
2023-03-11 16:55                                 ` Qais Yousef
2023-03-23 16:29                           ` Dietmar Eggemann
2023-04-03 14:45                             ` Qais Yousef
2023-04-06 15:58                               ` Dietmar Eggemann
2023-04-11 17:51                                 ` Qais Yousef
2022-11-09 15:18             ` Lukasz Luba
2022-11-10 11:16             ` Dietmar Eggemann
2022-11-10 13:05               ` Peter Zijlstra
2022-11-10 14:59                 ` Dietmar Eggemann
2022-11-10 17:51                   ` Peter Zijlstra
2022-11-30 18:14                     ` Dietmar Eggemann
2022-12-01 13:37                       ` Kajetan Puchalski
2022-11-10 12:45             ` Kajetan Puchalski
2022-11-07  9:41     ` Jian-Min Liu (劉建旻)

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