[igt-dev] [PATCH i-g-t 1/3] tests/perf_pmu: Use perf timestamps in a few more places

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-02-08 08:01:29)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Use perf timestamps in more places where possible.

Minor request, keep ulong slept around and igt_debug the difference
between slept and ts[].
-Chris