Quoting Chris Wilson (2019-11-08 08:56:24)
> We want to avoid taking forcewake when querying the performance stats,
> as we wish to avoid perturbing the system under observation. (And with
> the forcewake being kept alive for 1ms after use, sampling the frequency
> from a timer keeps forcewake 60% active.)

Oops, rc6 was reported as 60% active => fw 40% active.
-Chris
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