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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Rafael Wysocki <rjw@rjwysocki.net>,
	edubezval@gmail.com, Amit Daniel Kachhap <amit.kachhap@gmail.com>,
	Javi Merino <javi.merino@kernel.org>,
	Zhang Rui <rui.zhang@intel.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>,
	linux-pm@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	lukasz.luba@arm.com, linux-kernel@vger.kernel.org,
	Javi Merino <javi.merino@arm.com>,
	Punit Agrawal <punit.agrawal@arm.com>
Subject: Re: [PATCH 4/4] cpu_cooling: Drop static-power related stuff
Date: Wed, 15 Nov 2017 16:55:32 +0530	[thread overview]
Message-ID: <20171115112532.GL3257@vireshk-i7> (raw)
In-Reply-To: <761f7963-8b6d-b002-5404-a9ad0acf84d6@linaro.org>

On 15-11-17, 11:18, Daniel Lezcano wrote:
> Even if I agree that is not used to in the mainstream kernel, it is part
> of the EAS which is currently merged in Android.

Okay, I had chat with Daniel offline after looking at Android sources
and here are the key-points:
- No one is using this feature currently in Mainline or Android kernel
  tree.
- There may be some SoC vendors who are using it on their local repos,
  but we don't have much details on that.
- For EAS (Energy aware scheduling), we want to take static power of
  the CPUs into account and that is a TODO thing right now.

What worries me is that this code got merged almost 2.5 years back and
no one used it. Yeah, it looks interesting stuff but what's the
guarantee that anyone is going to use it in near future ?

@Javi, @Puneet, @Lukasz: As it was added by Javi (from ARM), can
someone from ARM write a patch for the arm big LITTLE cpufreq driver
(Juno?) and use this thing?

Else I am not sure how long we want to keep code in kernel that no one
touches.

And of course, we can revert this commit later on if required without
much trouble hopefully.

-- 
viresh

  reply	other threads:[~2017-11-15 11:25 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-15  9:19 [PATCH 0/4] cpu_cooling: cooling dev registration cleanups Viresh Kumar
2017-11-15  9:19 ` [PATCH 1/4] cpu_cooling: Make of_cpufreq_power_cooling_register() parse DT Viresh Kumar
2017-11-15  9:19 ` [PATCH 2/4] cpu_cooling: Remove unused cpufreq_power_cooling_register() Viresh Kumar
2017-11-15  9:19 ` [PATCH 3/4] cpu_cooling: Keep only one of_cpufreq*cooling_register() helper Viresh Kumar
2017-11-15  9:19 ` [PATCH 4/4] cpu_cooling: Drop static-power related stuff Viresh Kumar
2017-11-15 10:18   ` Daniel Lezcano
2017-11-15 11:25     ` Viresh Kumar [this message]
2017-11-15 15:43     ` Eduardo Valentin
2017-11-15 18:17       ` Rafael J. Wysocki
2017-11-15 18:20         ` Eduardo Valentin
2017-11-16 15:02           ` Ionela Voinescu
2017-11-16 15:20             ` Viresh Kumar
2017-11-16 23:31               ` Rafael J. Wysocki
2017-11-16 23:44                 ` Eduardo Valentin
2017-11-17 11:02                   ` Punit Agrawal
2017-11-17 11:06                     ` Viresh Kumar
2017-11-21 11:30                     ` Ionela Voinescu
2017-11-21 13:06                       ` Daniel Lezcano
2017-11-21 15:56                         ` Lukasz Luba
2017-11-21 16:08                           ` Vincent Guittot
2017-11-21 16:57                             ` Eduardo Valentin
2017-11-21 18:00                               ` Javi Merino
2017-11-21 18:05                                 ` Daniel Lezcano
2017-11-21 18:13                                   ` Eduardo Valentin
2017-11-21 23:32                                     ` Lukasz Luba
2017-11-21 18:12                                 ` Eduardo Valentin
2017-11-22 10:59                                   ` Sudeep Holla
2017-11-22 11:10                                     ` Viresh Kumar
2017-11-22 11:17                                       ` Sudeep Holla
2017-11-22 15:38                                       ` Eduardo Valentin
2017-11-22 15:34                                     ` Eduardo Valentin
2017-11-22 16:04                                       ` Sudeep Holla
2017-11-22  1:25                                 ` Viresh Kumar
2017-11-22 11:08                                   ` Viresh Kumar
2017-11-21 17:03                             ` Lukasz Luba
2017-11-21 17:09                       ` Eduardo Valentin
2017-11-21 17:49                         ` Daniel Lezcano
2017-11-16  2:47         ` Viresh Kumar
2017-11-17  7:55           ` Daniel Lezcano
2017-11-15 11:31   ` Javi Merino
2017-11-15 11:39     ` Daniel Lezcano
2017-11-15 15:09       ` Eduardo Valentin
2017-11-15 18:08 ` [PATCH 0/4] cpu_cooling: cooling dev registration cleanups Rafael J. Wysocki

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