On 16-08-21, 16:19, Rafael J. Wysocki wrote:

On Tue, Aug 10, 2021 at 8:13 AM Viresh Kumar [off-list ref] wrote:

quoted

 I understand  that this was done to not do the efficient stuff in case of
  userspace/powersave/performance governors.

  What about reusing following for finding all such cases ?

        policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING

  The driver can set a flag to tell if it wants efficient frequencies
  or not, and at runtime we apply efficient algorithm only if the
  current governor does DVFS, which will leave out
  userspace/performance/powersave.

As long as this can be done without actually accessing
policy->governor->flags on every transition, it sounds like a good
idea.

Great.

Vincent, I hope you will be taking this forward then ?

-- 
viresh