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From: Vincent Guittot <vincent.guittot@linaro.org>
To: Quentin Perret <quentin.perret@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"open list:THERMAL" <linux-pm@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	Ingo Molnar <mingo@redhat.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Chris Redpath <chris.redpath@arm.com>,
	Patrick Bellasi <patrick.bellasi@arm.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Thara Gopinath <thara.gopinath@linaro.org>,
	viresh kumar <viresh.kumar@linaro.org>,
	Todd Kjos <tkjos@google.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	"Cc: Steve Muckle" <smuckle@google.com>,
	adharmap@codeaurora.org, Saravana Kannan <skannan@codeaurora.org>,
	pkondeti@codeaurora.org, Juri Lelli <juri.lelli@redhat.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	currojerez@riseup.net, Javi Merino <javi.merino@kernel.org>
Subject: Re: [PATCH v7 02/14] sched/cpufreq: Prepare schedutil for Energy Aware Scheduling
Date: Wed, 12 Sep 2018 16:56:31 +0200	[thread overview]
Message-ID: <CAKfTPtA1BDHNnadZ4a3F+ZGt_GbM825P91toMdCimsMdu7q0Ew@mail.gmail.com> (raw)
In-Reply-To: <20180912091309.7551-3-quentin.perret@arm.com>

Hi Quentin,

On Wed, 12 Sep 2018 at 11:13, Quentin Perret <quentin.perret@arm.com> wrote:
>
> Schedutil requests frequency by aggregating utilization signals from
> the scheduler (CFS, RT, DL, IRQ) and applying and 25% margin on top of

quite a minor thing but s/and 25%/a 25%/

> them. Since Energy Aware Scheduling (EAS) needs to be able to predict
> the frequency requests, it needs to forecast the decisions made by the
> governor.
>
> In order to prepare the introduction of EAS, introduce
> schedutil_freq_util() to centralize the aforementioned signal
> aggregation and make it available to both schedutil and EAS. Since
> frequency selection and energy estimation still need to deal with RT and
> DL signals slightly differently, schedutil_freq_util() is called with a
> different 'type' parameter in those two contexts, and returns an
> aggregated utilization signal accordingly. While at it, introduce the
> map_util_freq() function which is designed to make schedutil's 25%
> margin usable easily for both sugov and EAS.
>
> As EAS will be able to predict schedutil's frequency requests more
> accurately than any other governor by design, it'd be sensible to make
> sure EAS cannot be used without schedutil. This will be done later, once
> EAS has actually been introduced.
>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Suggested-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Quentin Perret <quentin.perret@arm.com>

  reply	other threads:[~2018-09-12 14:56 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-12  9:12 [PATCH v7 00/14] Energy Aware Scheduling Quentin Perret
2018-09-12  9:12 ` [PATCH v7 01/14] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-09-12  9:12 ` [PATCH v7 02/14] sched/cpufreq: Prepare schedutil for Energy Aware Scheduling Quentin Perret
2018-09-12 14:56   ` Vincent Guittot [this message]
2018-09-18 21:33   ` Rafael J. Wysocki
2018-09-27 12:17     ` Quentin Perret
2018-09-28  8:23       ` Rafael J. Wysocki
2018-09-28  8:35         ` Quentin Perret
2018-09-28  8:35           ` Rafael J. Wysocki
2018-09-12  9:12 ` [PATCH v7 03/14] PM: Introduce an Energy Model management framework Quentin Perret
2018-10-02 12:25   ` Peter Zijlstra
2018-10-02 12:54     ` Quentin Perret
2018-10-02 13:50       ` Peter Zijlstra
2018-10-02 12:30   ` Peter Zijlstra
2018-10-02 12:51     ` Quentin Perret
2018-10-02 13:48       ` Peter Zijlstra
2018-10-02 14:05         ` Quentin Perret
2018-10-02 14:29           ` Peter Zijlstra
2018-10-02 14:40             ` Quentin Perret
2018-10-02 19:12               ` Andrea Parri
2018-10-03  7:48                 ` Quentin Perret
2018-09-12  9:12 ` [PATCH v7 04/14] PM / EM: Expose the Energy Model in sysfs Quentin Perret
2018-09-12  9:13 ` [PATCH v7 05/14] sched: Introduce a sched_feat for Energy Aware Scheduling Quentin Perret
2018-10-02 12:34   ` Peter Zijlstra
2018-10-02 13:08     ` Quentin Perret
2018-10-03 16:24       ` Peter Zijlstra
2018-10-04  9:57         ` Quentin Perret
2018-09-12  9:13 ` [PATCH v7 06/14] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-10-02 12:36   ` Peter Zijlstra
2018-10-02 13:16     ` Quentin Perret
2018-09-12  9:13 ` [PATCH v7 07/14] sched/topology: Lowest CPU asymmetry sched_domain level pointer Quentin Perret
2018-09-12  9:13 ` [PATCH v7 08/14] sched/topology: Disable EAS on inappropriate platforms Quentin Perret
2018-10-03 16:27   ` Peter Zijlstra
2018-10-04  9:10     ` Quentin Perret
2018-10-04  9:38       ` Peter Zijlstra
2018-10-04  9:45         ` Quentin Perret
2018-09-12  9:13 ` [PATCH v7 09/14] sched/fair: Clean-up update_sg_lb_stats parameters Quentin Perret
2018-09-12  9:13 ` [PATCH v7 10/14] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-09-12  9:13 ` [PATCH v7 11/14] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-10-04  8:34   ` Peter Zijlstra
2018-10-04  9:02     ` Quentin Perret
2018-09-12  9:13 ` [PATCH v7 12/14] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-10-04  9:44   ` Peter Zijlstra
2018-10-04 10:27     ` Quentin Perret
2018-10-04 10:41       ` Peter Zijlstra
2018-10-04 10:55         ` Quentin Perret
2018-10-04 12:18           ` Peter Zijlstra
2018-09-12  9:13 ` [PATCH v7 13/14] sched/topology: Make Energy Aware Scheduling depend on schedutil Quentin Perret
2018-10-04 10:50   ` Peter Zijlstra
2018-10-04 11:58     ` Quentin Perret
2018-09-12  9:13 ` [PATCH v7 14/14] OPTIONAL: cpufreq: dt: Register an Energy Model Quentin Perret

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