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From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
	"Li, Aubrey" <aubrey.li@linux.intel.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Jiang Biao <benbjiang@gmail.com>
Subject: Re: [RFC][PATCH 1/5] sched/fair: Fix select_idle_cpu()s cost accounting
Date: Fri, 8 Jan 2021 20:45:44 +0100	[thread overview]
Message-ID: <X/i2aIKmeyi5SZ7g@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtCGCmCv0yXSUmYUh6=8uzd0n9xFPqC0cW4sm-FqDvjvCQ@mail.gmail.com>

On Fri, Jan 08, 2021 at 04:10:51PM +0100, Vincent Guittot wrote:
> Also, there is another problem (that I'm investigating)  which is that
> this_rq()->avg_idle is stalled when your cpu is busy. Which means that
> this avg_idle can just be a very old and meaningless value. I think
> that we should decay it periodically to reflect there is less and less

https://lkml.kernel.org/r/20180530143105.977759909@infradead.org

:-)

  parent reply	other threads:[~2021-01-08 19:47 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-14 16:48 [RFC][PATCH 0/5] select_idle_sibling() wreckage Peter Zijlstra
2020-12-14 16:48 ` [RFC][PATCH 1/5] sched/fair: Fix select_idle_cpu()s cost accounting Peter Zijlstra
2020-12-15  3:36   ` Li, Aubrey
2020-12-15  7:59     ` Peter Zijlstra
2020-12-15 11:45       ` Mel Gorman
2020-12-15 12:13       ` Li, Aubrey
2021-01-08 10:27       ` Mel Gorman
2021-01-08 13:01         ` Qais Yousef
2021-01-08 13:47           ` Mel Gorman
2021-01-08 13:41         ` Vincent Guittot
2021-01-08 14:40           ` Mel Gorman
2021-01-08 15:10             ` Vincent Guittot
2021-01-08 16:14               ` Mel Gorman
2021-01-11 14:36                 ` Vincent Guittot
2021-01-11 15:58                   ` Mel Gorman
2021-01-08 19:45               ` Peter Zijlstra [this message]
2021-01-09 14:12                 ` Mel Gorman
2021-01-11 14:39                 ` Vincent Guittot
2021-01-08 19:49               ` Peter Zijlstra
2021-01-11 14:52                 ` Vincent Guittot
2021-01-08 20:21         ` Peter Zijlstra
2021-01-09 13:59           ` Mel Gorman
2020-12-14 16:48 ` [RFC][PATCH 2/5] sched/fair: Make select_idle_cpu() proportional to cores Peter Zijlstra
2020-12-23 13:31   ` Vincent Guittot
2020-12-14 16:48 ` [RFC][PATCH 3/5] sched/fair: Remove select_idle_smt() Peter Zijlstra
2020-12-14 16:48 ` [RFC][PATCH 4/5] sched/fair: Merge select_idle_core/cpu() Peter Zijlstra
2020-12-14 16:48 ` [RFC][PATCH 5/5] sched/fair: SIS_PROP the idle core scan Peter Zijlstra
2020-12-16 12:59 ` [RFC][PATCH 0/5] select_idle_sibling() wreckage Li, Aubrey
2020-12-16 18:07   ` Vincent Guittot
2020-12-23 13:23     ` Vincent Guittot
2021-01-04 15:40       ` Mel Gorman

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