[igt-dev] [PATCH i-g-t 3/3] tests/perf_pmu: Give sampling more time

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-02-08 08:01:31)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> We get occasional errors like:
> 
>  (perf_pmu:21315) CRITICAL: Test assertion failure function sema_wait, file perf_pmu.c:631:
>  (perf_pmu:21315) CRITICAL: Failed assertion: (double)(val[1] - val[0]) <= (1.0 + (tolerance)) * (double)(slept) && (double)(val[1] - val[0]) >= (1.0 - (tolerance)) * (double)(slept)
>  (perf_pmu:21315) CRITICAL: 'val[1] - val[0]' != 'slept' (450000000.000000 not within 5.000000% tolerance of 500129618.000000)

Something to remember when reporting pmu errors is whether it's
sampling. In this case sema_wait is always sampling... But I wonder if
we can report it from pmu somehow?
-Chris