forked from Minki/linux
c5ce3b8df6
Due to the latency of the tasklet running from ksoftirqd, by the time we process the execlist dequeue may be a long time behind the GPU. If the request was completed when we ran reschedule, we will not have tweaked its priority, but if it is still listed as being in-flight for dequeue we will use it as a reference for the rest of the queue, including requests from its own context which will now be at higher priority. This can cause us to issue a preempt-to-idle request, even though the request we want to preempt is already complete. Reported-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180501122131.19435-1-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> |
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