[Intel-gfx] [PATCH 1/5] drm/i915/selftests: Skip unstable timing measurements

[Chris Wilson]

Quoting Andi Shyti (2021-01-08 12:26:45)
> Hi Chris,
> 
> > diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> > index 75839db63bea..59c58a276677 100644
> > --- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> > +++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
> > @@ -852,6 +852,9 @@ static int _perf_memcpy(struct intel_memory_region *src_mr,
> >               }
> >  
> >               sort(t, ARRAY_SIZE(t), sizeof(*t), wrap_ktime_compare, NULL);
> > +             if (!t[0])
> > +                     continue;
> > +
> 
> are you assuming here that if t[0] is '0', also the rest of 't'
> is '0'?

It's sorted into ascending order with ktime_t... Hmm, s64 not u64 as I
presumed. So better to check <= 0.
-Chris