On 05/02/2018 13:18, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2018-02-05 11:45:17)
On 05/02/2018 10:31, Patchwork wrote:
== Series Details ==
Series: RFC drm/i915/pmu: Avoid sleeping rpm_get under atomic PMU read
URL : https://patchwork.freedesktop.org/series/37644/
State : success
== Summary ==
Test perf_pmu:
Subgroup busy-double-start-vcs0:
pass -> INCOMPLETE (shard-apl) fdo#103927
This is most probably the race "drm/i915/pmu: Fix PMU enable vs
execlists tasklet race" will fix once merged.
I was hoping to see some pmu-rc6 oddity to write off the patch. :|
Albeit not ideal some fix is needed.
Maybe move to timer sampling and assume RC6 grows by PERIOD while device
is suspended, then when awake, make sure we don't add the real RC6
counter until it catches up with the faked value. So to ensure no
backwards jumps? It should catch up eventually, unless there is no RC6
at all. Hm, can we detect that in the very beginning?
Regards,
Tvrtko
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