[Intel-gfx] [RFC v2 3/3] drm/i915/pmu: deny perf driver level sampling of i915 PMU

[Rogozhkin, Dmitry V]

Returning mailing list back.

Just tried ./intel-gpu-overlay. From what I see it wonderfully works even when I wiped out event->sampling_period from i915 RFC PMU and prohibited it. Mind that I did not remove sampling inside i915 RFC PMU: I removed only timer staff which is exposed to the perf core. Sampling itself is still there and works as far as I see.

Thus, the question: why event->hw->hrtimer staff was introduced in i915 RFC PMU? Right now it does not make sense to me.

Dmitry.

-----Original Message-----
From: Chris Wilson [mailto:chris at chris-wilson.co.uk] 
Sent: Friday, August 25, 2017 11:19 AM
To: Rogozhkin, Dmitry V <dmitry.v.rogozhkin at intel.com>; Wilson, Chris <chris.wilson at intel.com>
Subject: RE: [RFC v2 3/3] drm/i915/pmu: deny perf driver level sampling of i915 PMU

Quoting Rogozhkin, Dmitry V (2017-08-25 19:06:13)
> Hi Chris, not sure you saw my mail. So, I try to remind.

It's integral to all the sampling counters we use; which are the majority of the events exposed and used by intel-gpu-overlay.
-Chris