Re: [PATCH 06/12] drm/i915: Show support for accurate sw PMU busyness tracking

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Quoting Chris Wilson (2019-02-04 12:28:04)
> Quoting Tvrtko Ursulin (2019-02-04 12:14:38)
> > 
> > On 04/02/2019 08:41, Chris Wilson wrote:
> > > Expose whether or not we support the PMU software tracking in our
> > > scheduler capabilities, so userspace can query at runtime.
> > 
> > I am leaning towards thinking PMU is a backend and not the scheduler 
> > feature. We could export it via engine discovery for instance.
> 
> The sw metrics are buggy. They include semaphore time on top of busy,
> but historically that has always been separate (and how it's measured by
> the HW).

Furthermore they aren't even universally available today, breaking the
current assumption of HAS_EXECLISTS -> has SW PMU.
-Chris
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