[Intel-gfx] [igt-dev] [CI i-g-t] tests/perf_pmu: Avoid RT thread for accuracy test

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-03-26 11:57:58)
>  * No self-adjust - instead just report the achieved cycle and let the
>    parent check against it.

Sniff, I was rather proud of our achievement. I had it in mind as a
template for future autocalibration routines. Is it really useless
overengineering, or worse broken?
-Chris