From: Juri Lelli <juri.lelli@redhat.com>
To: Quentin Perret <quentin.perret@arm.com>
Cc: Pavan Kondeti <pkondeti@codeaurora.org>,
peterz@infradead.org, rjw@rjwysocki.net,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.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, joelaf@google.com, smuckle@google.com,
adharmap@quicinc.com, skannan@quicinc.com, edubezval@gmail.com,
srinivas.pandruvada@linux.intel.com, currojerez@riseup.net,
javi.merino@kernel.org
Subject: Re: [RFC PATCH v3 10/10] arch_topology: Start Energy Aware Scheduling
Date: Tue, 19 Jun 2018 11:47:14 +0200 [thread overview]
Message-ID: <20180619094714.GA13617@localhost.localdomain> (raw)
In-Reply-To: <20180619094002.GR17720@e108498-lin.cambridge.arm.com>
On 19/06/18 10:40, Quentin Perret wrote:
> Hi Pavan,
>
> On Tuesday 19 Jun 2018 at 14:48:41 (+0530), Pavan Kondeti wrote:
[...]
> > There seems to be a sysfs interface exposed by this driver to change cpu_scale.
> > Should we worry about it? I don't know what is the usecase for changing the
> > cpu_scale from user space.
>
> This is something I've been wondering as well. TBH, I'm not sure what to
> do in this case. And I'm not sure to know what is the use-case either.
> Debugging purpose I assume ?
>
> Juri, did you have a specific use-case for this feature when the
> arch_topology driver was first introduced ? Or was it just to align
> with the existing arm/arm64 code ?
It was requested (IIRC) because DT might have bogus values and not be
easily modifiable. So, this is another way to get things right for your
platform at runtime.
next prev parent reply other threads:[~2018-06-19 9:47 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-21 14:24 [RFC PATCH v3 00/10] Energy Aware Scheduling Quentin Perret
2018-05-21 14:24 ` [RFC PATCH v3 01/10] sched: Relocate arch_scale_cpu_capacity Quentin Perret
2018-05-21 14:24 ` [RFC PATCH v3 02/10] sched/cpufreq: Factor out utilization to frequency mapping Quentin Perret
2018-05-21 14:24 ` [RFC PATCH v3 03/10] PM: Introduce an Energy Model management framework Quentin Perret
2018-06-06 13:12 ` Dietmar Eggemann
2018-06-06 14:37 ` Quentin Perret
2018-06-06 15:20 ` Juri Lelli
2018-06-06 15:29 ` Quentin Perret
2018-06-06 16:26 ` Quentin Perret
2018-06-07 15:58 ` Dietmar Eggemann
2018-06-08 13:39 ` Javi Merino
2018-06-08 15:47 ` Quentin Perret
2018-06-09 8:24 ` Javi Merino
2018-06-06 16:47 ` Juri Lelli
2018-06-06 16:59 ` Quentin Perret
2018-06-07 14:44 ` Juri Lelli
2018-06-07 15:19 ` Quentin Perret
2018-06-07 15:55 ` Dietmar Eggemann
2018-06-08 8:25 ` Quentin Perret
2018-06-08 9:36 ` Juri Lelli
2018-06-08 10:31 ` Quentin Perret
2018-06-08 12:39 ` Dietmar Eggemann
2018-06-08 13:11 ` Quentin Perret
2018-06-08 16:39 ` Dietmar Eggemann
2018-06-08 17:02 ` Quentin Perret
2018-06-07 16:04 ` Juri Lelli
2018-06-07 17:31 ` Quentin Perret
2018-06-09 8:13 ` Javi Merino
2018-06-19 11:07 ` Peter Zijlstra
2018-06-19 12:35 ` Quentin Perret
2018-06-19 11:31 ` Peter Zijlstra
2018-06-19 12:40 ` Quentin Perret
2018-06-19 11:34 ` Peter Zijlstra
2018-06-19 12:58 ` Quentin Perret
2018-06-19 13:23 ` Peter Zijlstra
2018-06-19 13:38 ` Quentin Perret
2018-06-19 14:16 ` Peter Zijlstra
2018-06-19 14:21 ` Peter Zijlstra
2018-06-19 14:30 ` Peter Zijlstra
2018-06-19 14:23 ` Quentin Perret
2018-05-21 14:24 ` [RFC PATCH v3 04/10] PM / EM: Expose the Energy Model in sysfs Quentin Perret
2018-06-19 12:16 ` Peter Zijlstra
2018-06-19 13:06 ` Quentin Perret
2018-05-21 14:25 ` [RFC PATCH v3 05/10] sched/topology: Reference the Energy Model of CPUs when available Quentin Perret
2018-06-07 14:44 ` Juri Lelli
2018-06-07 16:02 ` Quentin Perret
2018-06-07 16:29 ` Juri Lelli
2018-06-07 17:26 ` Quentin Perret
2018-06-19 12:26 ` Peter Zijlstra
2018-06-19 13:24 ` Quentin Perret
2018-06-19 16:20 ` Peter Zijlstra
2018-06-19 17:13 ` Quentin Perret
2018-06-19 18:42 ` Peter Zijlstra
2018-06-20 7:58 ` Quentin Perret
2018-05-21 14:25 ` [RFC PATCH v3 06/10] sched: Add over-utilization/tipping point indicator Quentin Perret
2018-06-19 7:01 ` Pavan Kondeti
2018-06-19 10:26 ` Dietmar Eggemann
2018-05-21 14:25 ` [RFC PATCH v3 07/10] sched/fair: Introduce an energy estimation helper function Quentin Perret
2018-06-08 10:30 ` Juri Lelli
2018-06-19 9:51 ` Pavan Kondeti
2018-06-19 9:53 ` Quentin Perret
2018-05-21 14:25 ` [RFC PATCH v3 08/10] sched: Lowest energy aware balancing sched_domain level pointer Quentin Perret
2018-05-21 14:25 ` [RFC PATCH v3 09/10] sched/fair: Select an energy-efficient CPU on task wake-up Quentin Perret
2018-06-08 10:24 ` Juri Lelli
2018-06-08 11:19 ` Quentin Perret
2018-06-08 11:59 ` Juri Lelli
2018-06-08 16:26 ` Quentin Perret
2018-06-19 5:06 ` Pavan Kondeti
2018-06-19 7:57 ` Quentin Perret
2018-06-19 8:41 ` Pavan Kondeti
2018-05-21 14:25 ` [RFC PATCH v3 10/10] arch_topology: Start Energy Aware Scheduling Quentin Perret
2018-06-19 9:18 ` Pavan Kondeti
2018-06-19 9:40 ` Quentin Perret
2018-06-19 9:47 ` Juri Lelli [this message]
2018-06-19 10:02 ` Quentin Perret
2018-06-19 10:19 ` Juri Lelli
2018-06-19 10:25 ` Quentin Perret
2018-06-19 10:31 ` Juri Lelli
2018-06-19 10:49 ` Quentin Perret
2018-06-01 9:29 ` [RFC PATCH v3 00/10] " Quentin Perret
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