Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1686762

Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching"

From "Rafael J. Wysocki" <rafael@kernel.org>
Newsgroups linux.kernel
Subject Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching"
Date 2017-07-13 18:30 +0200
Message-ID <u2Pa2-7UJ-7@gated-at.bofh.it> (permalink)
References <u2FaF-1xh-3@gated-at.bofh.it> <u2FaG-1xh-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Thu, Jul 13, 2017 at 7:40 AM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> There is no limitation in the ondemand or conservative governors which
> disallow the transition_latency to be greater than 10 ms.
>
> The max_transition_latency field is rather used to disallow automatic
> dynamic frequency switching for platforms which didn't wanted these
> governors to run.
>
> Replace max_transition_latency with a boolean (dynamic_switching) and
> check for transition_latency == CPUFREQ_ETERNAL along with that. This
> makes it pretty straight forward to read/understand now.

Well, using CPUFREQ_ETERNAL for that on the driver side is still not
particularly straightforward IMO, so maybe add a
"no_dynamic_switching" to the driver structure and set it to "true"
for the one driver in question?

Thanks,
Rafael

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-13 07:50 +0200
  Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" "Rafael J. Wysocki" <rafael@kernel.org> - 2017-07-13 18:30 +0200
    Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with  "dynamic_switching" Dominik Brodowski <linux@dominikbrodowski.net> - 2017-07-14 09:10 +0200
      Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" "Rafael J. Wysocki" <rafael@kernel.org> - 2017-07-14 13:20 +0200
        Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-15 00:20 +0200
          Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with  "dynamic_switching" Dominik Brodowski <linux@dominikbrodowski.net> - 2017-07-15 07:20 +0200
            Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-15 14:40 +0200
              Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with  "dynamic_switching" Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-17 14:00 +0200
                Re: [RFC V2 1/6] cpufreq: Replace "max_transition_latency" with "dynamic_switching" "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-17 14:30 +0200

csiph-web