From: Lukasz Luba <lukasz.luba@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
"open list:THERMAL" <linux-pm@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Quentin Perret <qperret@google.com>,
Vincent Donnefort <vincent.donnefort@arm.com>,
Beata Michalska <Beata.Michalska@arm.com>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
segall@google.com, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Thara Gopinath <thara.gopinath@linaro.org>,
Amit Kachhap <amit.kachhap@gmail.com>,
Amit Kucheria <amitk@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH v4 2/3] sched/fair: Take thermal pressure into account while estimating energy
Date: Wed, 16 Jun 2021 21:22:40 +0100 [thread overview]
Message-ID: <79dbb2ad-88c1-ff08-59c8-7728d37ee78a@arm.com> (raw)
In-Reply-To: <CAKfTPtCpWrubqp2W8NQA0JTh2dJx3oxGuCBJbZ04reFzCbDxEg@mail.gmail.com>
On 6/16/21 8:25 PM, Vincent Guittot wrote:
> On Wed, 16 Jun 2021 at 19:24, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
>>
>> On 15/06/2021 18:09, Lukasz Luba wrote:
>>>
>>> On 6/15/21 4:31 PM, Dietmar Eggemann wrote:
>>>> On 14/06/2021 21:11, Lukasz Luba wrote:
>>
>> [...]
>>
>>>> It's important to highlight that this will only fix this issue between
>>>> schedutil and EAS when it's due to `thermal pressure` (today only via
>>>> CPU cooling). There are other places which could restrict policy->max
>>>> via freq_qos_update_request() and EAS will be unaware of it.
>>>
>>> True, but for this I have some other plans.
>>
>> As long as people are aware of the fact that this was developed to be
>> beneficial for `EAS - IPA` integration, I'm fine with this.
>
> I don't think it's only for EAS - IPA. Thermal_pressure can be used by
> HW throttling like here:
> https://lkml.org/lkml/2021/6/8/1791
>
> EAS is involved but not IPA
Thank you Vincent for pointing to Thara's patches. Indeed, this is a
good example. We will have to provide similar for our SCMI perf
notifications - these are the plans that I've mentioned. In both
new examples, the IPA (or other governors) won't be even involved.
next prev parent reply other threads:[~2021-06-16 20:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 18:58 [PATCH v4 0/3] Add allowed CPU capacity knowledge to EAS Lukasz Luba
2021-06-14 19:10 ` [PATCH 1/3] thermal: cpufreq_cooling: Update also offline CPUs per-cpu thermal_pressure Lukasz Luba
2021-06-18 8:46 ` [tip: sched/core] thermal/cpufreq_cooling: Update " tip-bot2 for Lukasz Luba
2021-06-14 19:11 ` [PATCH v4 2/3] sched/fair: Take thermal pressure into account while estimating energy Lukasz Luba
2021-06-15 15:31 ` Dietmar Eggemann
2021-06-15 16:09 ` Lukasz Luba
2021-06-16 17:24 ` Dietmar Eggemann
2021-06-16 18:31 ` Lukasz Luba
2021-06-16 19:25 ` Vincent Guittot
2021-06-16 20:22 ` Lukasz Luba [this message]
2021-06-18 8:46 ` [tip: sched/core] " tip-bot2 for Lukasz Luba
2021-06-14 19:12 ` [PATCH v4 3/3] sched/cpufreq: Consider reduced CPU capacity in energy calculation Lukasz Luba
2021-06-18 8:46 ` [tip: sched/core] " tip-bot2 for Lukasz Luba
2021-06-16 13:33 ` [PATCH v4 0/3] Add allowed CPU capacity knowledge to EAS Lukasz Luba
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