linux-kernel - Re: [RFC PATCH] sched: fair: reset task_group.load

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Date: Thu, 21 Dec 2023 16:21:05 +0800
From: Aaron Lu <aaron.lu@...el.com>
To: Vincent Guittot <vincent.guittot@...aro.org>
CC: Imran Khan <imran.f.khan@...cle.com>, <mingo@...hat.com>,
	<peterz@...radead.org>, <juri.lelli@...hat.com>, <dietmar.eggemann@....com>,
	<rostedt@...dmis.org>, <bsegall@...gle.com>, <mgorman@...e.de>,
	<bristot@...hat.com>, <vschneid@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] sched: fair: reset task_group.load_avg when there
 are no running tasks.

Hi Vincent,

Thanks for the heads up.

On Wed, Dec 20, 2023 at 06:31:08PM +0100, Vincent Guittot wrote:
> Aaron,
> Could you run the tests that you run for testing "Ratelimit update to
> tg->load_avg" and check if this patch impacts your performance ?

I run hackbench/netperf/postgres_sysbench with nr_thread=nr_cpu on a 2
sockets/120cores/240cpus Intel server and didn't notice any performance
change after applying your diff so I think it's not a problem.

Regards,
Aaron