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Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1

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From Diederik de Haas <didi.debian@cknow.org>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1
Date Sat, 07 Aug 2021 22:40:02 +0200
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On vrijdag 6 augustus 2021 16:07:18 CEST Diederik de Haas wrote:
> > > -CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> > > +# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
> > > -# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
> > > +CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
> > > -CONFIG_CPU_FREQ_GOV_ONDEMAND=m
> > > +CONFIG_CPU_FREQ_GOV_ONDEMAND=y
> > 
> > Hmm, CONFIG_CPU_FREQ_GOV_ONDEMAND=m is already there, so you should be
> > able to switch to that if you prefer it?!
> 
> Yes, afaik it isn't needed.
> I did notice that there are 2 schedulers which are often used as default,
> namely 'performance' and 'schedutil' and those are also builtin.
> That's the reason I made 'ondemand' builtin as well, but it's entirely
> possible that correlation != causation and I inferred
> an incorrect 'conclusion'.
> 
> Trying to find why 'performance' and 'schedutil' were builtin, resulted in
> https://salsa.debian.org/kernel-team/linux/-/commit/e5b976c268e44d452bc5ae23
> b765eab26c4409ae which suggest the (sole) reason that it got builtin is that
> it couldn't be modular in 4.9. That can very well have changed since.

If you do 'make menuconfig' and change the default governor, it automatically 
makes the matching CPU_FREQ_GOV_* parameter builtin. And you can't change 
that. And apparently you can't make CPU_FREQ_GOV_PERFORMANCE a module. At all.
So menuconfig is telling me that the default governor must use a builtin 
module.

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Thread

Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Diederik de Haas <didi.debian@cknow.org> - 2021-08-05 19:40 +0200
  Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Uwe Kleine-König <u.kleine-koenig@pengutronix.de> - 2021-08-06 15:40 +0200
    Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Diederik de Haas <didi.debian@cknow.org> - 2021-08-06 16:10 +0200
      Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Diederik de Haas <didi.debian@cknow.org> - 2021-08-07 22:40 +0200
      Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Diederik de Haas <didi.debian@cknow.org> - 2021-09-27 03:10 +0200
  Bug#991921: linux: Please enable CPUFREQ options for RPi 0/0w/1 Diederik de Haas <didi.debian@cknow.org> - 2021-08-08 17:10 +0200
  Bug#991921: marked as done (linux: Please enable CPUFREQ options  for RPi 0/0w/1) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2021-11-04 10:10 +0100

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