[igt-dev] [PATCH i-g-t 1/3] tests/perf_pmu: Tighten busy measurement

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-02-01 16:58:21)
> 
> I am just moving the two sample read-outs closer together in time. Two 
> samples are measure of how long we slept, and measure of PMU busyness. 
> There should be as little time as possible between the two readouts. 
> Ending the spinner I don't see how it belongs in this sandwich, or 
> anything else really.

Then we disagree on what we think we are measuring. The usleep should
equal the busy value defined by the spin-batch.
-Chris