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

Groups > linux.kernel > #1374488

Re: [PATCH] cpufreq: Skip all governor-related actions for cpufreq_suspended set

Show all headers | View raw

On Friday, April 08, 2016 11:14:14 AM Viresh Kumar wrote:
> On 08-04-16, 00:05, Rafael J. Wysocki wrote:
> > On Thursday, April 07, 2016 05:35:03 PM Viresh Kumar wrote:
> 
> > > That's *ugly* and it works by chance, unless I am misreading it
> > > completely.
> > 
> > I'm assuming that what you mean by "ugly" here is "not really straightforward",
> > which I agree with,
> 
> Yeah.
> 
> > but then it is really disappointing to see comments like
> > that from you about the code that you helped to write.
> 
> I was just trying to say that this isn't how I feel it should be done.
> :(

Fair enough.

> > Moreover, runtime CPU offline *also* doesn't have to run the governor exit/init
> > for the same reason why the policy directory doesn't have to be removed on
> > CPU offline: it is just pointless to do that.  The governor has been stopped
> > already and it won't do anything more.  The only problem here is to prevent
> > governor tunable sysfs attributes from triggering actions in that state,
> > but that shouldn't be too difficult to arrange for.  If that's done,
> 
> Isn't that already guaranteed as userspace should have been frozen by
> by the time we reach cpufreq_suspend()?

For the "offline/online during suspend/resume" case it is guaranteed, but for
the "runtime offline/online" case it isn't.

I essentially would like those two cases to be as similar as reasonably
possible, if not identical.

Thanks,
Rafael

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

Thread

[PATCH] cpufreq: Skip all governor-related actions for cpufreq_suspended set "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-07 03:30 +0200
  Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-07 06:30 +0200
    Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-07 13:30 +0200
      Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-07 13:40 +0200
        Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-07 13:50 +0200
          Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-07 14:10 +0200
            Re: [PATCH] cpufreq: Skip all governor-related actions for cpufreq_suspended set "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-08 00:10 +0200
              Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-08 07:50 +0200
                Re: [PATCH] cpufreq: Skip all governor-related actions for cpufreq_suspended set "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-09 00:00 +0200
  Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-08 07:50 +0200
    Re: [PATCH] cpufreq: Skip all governor-related actions for cpufreq_suspended set "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-09 00:00 +0200
      Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-10 05:20 +0200
        Re: [PATCH] cpufreq: Skip all governor-related actions for  cpufreq_suspended set "Rafael J. Wysocki" <rafael@kernel.org> - 2016-04-10 05:50 +0200
          [PATCH] cpufreq: Abort cpufreq_update_current_freq() for cpufreq_suspended set "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-10 06:10 +0200
            Re: [PATCH] cpufreq: Abort cpufreq_update_current_freq() for  cpufreq_suspended set Viresh Kumar <viresh.kumar@linaro.org> - 2016-04-10 06:20 +0200

csiph-web