From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Quentin Perret <quentin.perret@arm.com>
Cc: peterz@infradead.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, gregkh@linuxfoundation.org,
mingo@redhat.com, dietmar.eggemann@arm.com,
morten.rasmussen@arm.com, chris.redpath@arm.com,
patrick.bellasi@arm.com, valentin.schneider@arm.com,
vincent.guittot@linaro.org, thara.gopinath@linaro.org,
viresh.kumar@linaro.org, tkjos@google.com,
joel@joelfernandes.org, smuckle@google.com,
adharmap@codeaurora.org, skannan@codeaurora.org,
pkondeti@codeaurora.org, juri.lelli@redhat.com,
edubezval@gmail.com, srinivas.pandruvada@linux.intel.com,
currojerez@riseup.net, javi.merino@kernel.org
Subject: Re: [PATCH v6 10/14] sched/cpufreq: Refactor the utilization aggregation method
Date: Mon, 10 Sep 2018 12:25:02 +0200 [thread overview]
Message-ID: <26961140.kuCyhvbGLP@aspire.rjw.lan> (raw)
In-Reply-To: <20180910100719.uan6gskxpgu25dj5@queper01-lin>
On Monday, September 10, 2018 12:07:21 PM CEST Quentin Perret wrote:
> On Monday 10 Sep 2018 at 11:53:58 (+0200), Rafael J. Wysocki wrote:
> > On Monday, August 20, 2018 11:44:16 AM CEST Quentin Perret wrote:
> > > Schedutil aggregates the PELT signals of CFS, RT, DL and IRQ in order
> > > to decide which frequency to request. Energy Aware Scheduling (EAS)
> > > needs to be able to predict those requests to assess the energy impact
> > > of scheduling decisions. However, the PELT signals aggregation is only
> > > done in schedutil for now, hence making it hard to synchronize it with
> > > EAS.
> > >
> > > To address this issue, introduce schedutil_freq_util() to perform the
> > > aforementioned aggregation and make it available to other parts of the
> > > scheduler. 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.
> >
> > This is complementary to patch [02/14] IMO.
> >
> > schedutil_freq_util() and map_util_freq() introduced by that patch should
> > always be used together as they are two parts of one algorithm in my view.
>
> I agree.
>
> > Would it be possible to make that clearer?
>
> I could squash the two at the beginning of the series in a preparatory
> patch that refactors schedutil for EAS all in one go, with a clear
> mention of what we intend to do (make EAS depend on sugov) in the commit
> message.
>
> Would that work ?
I think so.
Thanks,
Rafael
next prev parent reply other threads:[~2018-09-10 10:27 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 9:44 [PATCH v6 00/14] Energy Aware Scheduling Quentin Perret
2018-08-20 9:44 ` [PATCH v6 01/14] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-08-20 9:44 ` [PATCH v6 02/14] sched/cpufreq: Factor out utilization to frequency mapping Quentin Perret
2018-09-10 9:29 ` Rafael J. Wysocki
2018-08-20 9:44 ` [PATCH v6 03/14] PM: Introduce an Energy Model management framework Quentin Perret
2018-08-29 10:04 ` Patrick Bellasi
2018-08-29 13:28 ` Quentin Perret
2018-08-31 9:04 ` Patrick Bellasi
2018-09-11 9:34 ` Andrea Parri
2018-09-11 12:32 ` Quentin Perret
2018-09-11 13:31 ` Andrea Parri
2018-09-10 9:44 ` Rafael J. Wysocki
2018-09-10 10:38 ` Quentin Perret
2018-09-10 10:40 ` Rafael J. Wysocki
2018-08-20 9:44 ` [PATCH v6 04/14] PM / EM: Expose the Energy Model in sysfs Quentin Perret
2018-09-06 6:56 ` Dietmar Eggemann
2018-09-06 14:09 ` Quentin Perret
2018-09-07 0:14 ` Dietmar Eggemann
2018-08-20 9:44 ` [PATCH v6 05/14] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-08-29 16:22 ` Patrick Bellasi
2018-08-29 16:56 ` Quentin Perret
2018-08-30 10:00 ` Patrick Bellasi
2018-08-30 10:47 ` Quentin Perret
2018-08-30 12:50 ` Patrick Bellasi
2018-08-20 9:44 ` [PATCH v6 06/14] sched/topology: Lowest CPU asymmetry sched_domain level pointer Quentin Perret
2018-08-20 9:44 ` [PATCH v6 07/14] sched/topology: Introduce sched_energy_present static key Quentin Perret
2018-08-29 16:50 ` Patrick Bellasi
2018-08-29 17:20 ` Quentin Perret
2018-08-30 9:23 ` Patrick Bellasi
2018-08-30 9:57 ` Quentin Perret
2018-08-30 10:18 ` Patrick Bellasi
2018-09-06 6:06 ` Dietmar Eggemann
2018-09-06 9:29 ` Quentin Perret
2018-09-06 23:49 ` Dietmar Eggemann
2018-09-07 8:24 ` Quentin Perret
2018-08-20 9:44 ` [PATCH v6 08/14] sched/fair: Clean-up update_sg_lb_stats parameters Quentin Perret
2018-08-20 9:44 ` [PATCH v6 09/14] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-08-20 9:44 ` [PATCH v6 10/14] sched/cpufreq: Refactor the utilization aggregation method Quentin Perret
2018-09-10 9:53 ` Rafael J. Wysocki
2018-09-10 10:07 ` Quentin Perret
2018-09-10 10:25 ` Rafael J. Wysocki [this message]
2018-08-20 9:44 ` [PATCH v6 11/14] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-08-20 9:44 ` [PATCH v6 12/14] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-08-20 9:44 ` [PATCH v6 13/14] sched/topology: Make Energy Aware Scheduling depend on schedutil Quentin Perret
2018-09-04 10:59 ` Quentin Perret
2018-09-06 9:18 ` Rafael J. Wysocki
2018-09-06 9:18 ` Rafael J. Wysocki
2018-09-06 14:38 ` Quentin Perret
2018-09-06 14:38 ` Quentin Perret
2018-09-07 8:52 ` Rafael J. Wysocki
2018-09-07 8:52 ` Rafael J. Wysocki
2018-09-07 8:56 ` Rafael J. Wysocki
2018-09-07 8:56 ` Rafael J. Wysocki
2018-09-07 9:02 ` Quentin Perret
2018-09-07 9:02 ` Quentin Perret
2018-09-07 15:29 ` Quentin Perret
2018-09-07 15:29 ` Quentin Perret
2018-09-09 20:13 ` Rafael J. Wysocki
2018-09-09 20:13 ` Rafael J. Wysocki
2018-09-10 8:24 ` Quentin Perret
2018-09-10 8:24 ` Quentin Perret
2018-09-10 8:55 ` Rafael J. Wysocki
2018-09-10 8:55 ` Rafael J. Wysocki
2018-09-10 9:43 ` Quentin Perret
2018-09-10 9:43 ` Quentin Perret
2018-08-20 9:44 ` [PATCH v6 14/14] OPTIONAL: cpufreq: dt: Register an Energy Model Quentin Perret
2018-09-10 9:12 ` [PATCH v6 00/14] Energy Aware Scheduling Rafael J. Wysocki
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