Quoting Chris Wilson (2017-11-24 09:23:22)
> How? How do you tell if rc6 is not incrementing because (a) the hw is
> busy, (b) the hw is idle but in a different rc6 state, or (c) the pmu is
> broken.

Case in point is rc6p on shard-snb, where rc6p is disabled but the
pmu event still exists. It disabled by the kernel itself, but since the
pmu exists we expect it to increment.
-Chris
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