[Intel-gfx] Tracing PM-triggered GPU frequency changes from user space

[Chris Wilson]

Quoting Heinrich Fink (2017-11-14 17:18:39)
> On Tue, 2017-11-14 at 12:23 +0000, Chris Wilson wrote:
> > What is a PM-triggered change of gpu freq? Do you mean when the hw
> > itself throttles depending on thermal load.
> 
> yes, that's what I meant. Apologies for not being clear about this.
> 
> > Then no. Best you can do is
> > use the i915 pmu interface to watch real vs requested.
> 
> Are you referring to the patch series "i915 PMU and engine busy stats"
> [0]?

Yes, that's the slightly more refined approached than polling sysfs.
-Chris