From: Ingo Molnar <mingo@kernel.org>
To: Quentin Perret <quentin.perret@arm.com>
Cc: peterz@infradead.org, rjw@rjwysocki.net,
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,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH v10 10/15] sched: Introduce a sysctl for Energy Aware Scheduling
Date: Tue, 11 Dec 2018 15:15:09 +0100 [thread overview]
Message-ID: <20181211141509.GA32005@gmail.com> (raw)
In-Reply-To: <20181203095628.11858-11-quentin.perret@arm.com>
* Quentin Perret <quentin.perret@arm.com> wrote:
> In its current state, Energy Aware Scheduling (EAS) starts automatically
> on asymmetric platforms having an Energy Model (EM). However, there are
> users who want to have an EM (for thermal management for example), but
> don't want EAS with it.
Well, then introduce a new Kconfig variant for EAS, if it's super
important to allow this to be disabled.
Why do we want to disable it - is it not reliable in some circumstances?
> In order to let users disable EAS explicitly, introduce a new sysctl
> called 'sched_energy_aware'. It is enabled by default so that EAS can
> start automatically on platforms where it makes sense. Flipping it to 0
> rebuilds the scheduling domains and disables EAS.
Yeah, making this a sysctl ABI is asking for trouble - this really should
be a Kconfig or debug space knob, at most.
Thanks,
Ingo
next prev parent reply other threads:[~2018-12-11 14:15 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-03 9:56 [PATCH v10 00/15] " Quentin Perret
2018-12-03 9:56 ` [PATCH v10 01/15] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-12-11 15:32 ` [tip:sched/core] sched/topology: Relocate arch_scale_cpu_capacity() to the internal header tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 02/15] sched/cpufreq: Prepare schedutil for Energy Aware Scheduling Quentin Perret
2018-12-11 12:01 ` Rafael J. Wysocki
2018-12-11 12:17 ` Quentin Perret
2018-12-11 12:22 ` Rafael J. Wysocki
2018-12-11 12:24 ` Quentin Perret
2018-12-11 15:33 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 03/15] PM: Introduce an Energy Model management framework Quentin Perret
2018-12-11 15:33 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 04/15] PM / EM: Expose the Energy Model in sysfs Quentin Perret
2018-12-11 14:18 ` Ingo Molnar
2018-12-11 15:04 ` Quentin Perret
2018-12-03 9:56 ` [PATCH v10 05/15] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-12-11 15:34 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 06/15] sched/topology: Lowest CPU asymmetry sched_domain level pointer Quentin Perret
2018-12-11 15:34 ` [tip:sched/core] sched/topology: Add lowest " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 07/15] sched/topology: Disable EAS on inappropriate platforms Quentin Perret
2018-12-11 15:35 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 08/15] sched/topology: Make Energy Aware Scheduling depend on schedutil Quentin Perret
2018-12-11 15:36 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 09/15] sched: Introduce sched_energy_present static key Quentin Perret
2018-12-11 15:36 ` [tip:sched/core] sched/toplogy: Introduce the 'sched_energy_present' " tip-bot for Quentin Perret
2018-12-13 13:56 ` Quentin Perret
2018-12-03 9:56 ` [PATCH v10 10/15] sched: Introduce a sysctl for Energy Aware Scheduling Quentin Perret
2018-12-11 14:15 ` Ingo Molnar [this message]
2018-12-11 14:49 ` Quentin Perret
2018-12-13 14:03 ` Peter Zijlstra
2019-01-21 11:35 ` [tip:sched/core] sched/topology: " tip-bot for Quentin Perret
2019-01-21 13:51 ` tip-bot for Quentin Perret
2019-01-27 11:34 ` tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 11/15] sched/fair: Clean-up update_sg_lb_stats parameters Quentin Perret
2018-12-11 15:37 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 12/15] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-12-11 15:37 ` [tip:sched/core] sched/fair: " tip-bot for Morten Rasmussen
2018-12-03 9:56 ` [PATCH v10 13/15] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-12-11 15:38 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 14/15] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-12-11 15:39 ` [tip:sched/core] " tip-bot for Quentin Perret
2018-12-03 9:56 ` [PATCH v10 15/15] OPTIONAL: cpufreq: dt: Register an Energy Model Quentin Perret
2019-01-08 20:38 ` Matthias Kaehlcke
2019-01-09 10:57 ` Quentin Perret
2019-01-09 18:14 ` Matthias Kaehlcke
2019-01-10 9:08 ` Quentin Perret
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