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From: Peter Zijlstra <peterz@infradead.org>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: vincent.donnefort@arm.com, mingo@redhat.com,
	vincent.guittot@linaro.org, linux-kernel@vger.kernel.org,
	patrick.bellasi@matbug.net, dietmar.eggemann@arm.com,
	qais.yousef@arm.com
Subject: Re: [PATCH] sched/debug: Add new tracepoints to track util_est
Date: Wed, 3 Jun 2020 14:15:30 +0200	[thread overview]
Message-ID: <20200603121530.GB2570@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <jhjlfl4icdx.mognet@arm.com>

On Wed, Jun 03, 2020 at 01:04:26PM +0100, Valentin Schneider wrote:
> 
> On 27/05/20 17:39, vincent.donnefort@arm.com wrote:
> > From: Vincent Donnefort <vincent.donnefort@arm.com>
> >
> > The util_est signals are key elements for EAS task placement and
> > frequency selection. Having tracepoints to track these signals enables
> > load-tracking and schedutil testing and/or debugging by a toolkit.
> >
> > Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
> >
> 
> To put it more bluntly, we can't really do task placement / load tracking
> testing if util_est is enabled (which reminds me we may want to get rid of
> the SCHED_FEAT at some point, it's been default on since ~v4.17), since
> there can be noticeable gaps between util_avg and util_est.
> 
> Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>

Thanks!

  reply	other threads:[~2020-06-03 12:15 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-27 16:39 vincent.donnefort
2020-06-03 12:04 ` Valentin Schneider
2020-06-03 12:15   ` Peter Zijlstra [this message]
2020-06-16 12:21 ` [tip: sched/core] " tip-bot2 for Vincent Donnefort

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