[Intel-gfx] [PATCH 2/9] drm/i915: Rename execlists->queue_priority to queue_priority_hint

[Chris Wilson]

Quoting Chris Wilson (2019-01-29 17:02:00)
> After noticing that we trigger preemption events for currently executing
> requests, as well as requests that complete before the preemption and
> attempting to suppress those preemption events, it is wise to not
> consider the queue_priority to be authoritative. As we only track the
> maximum priority seen between dequeue passes, if the maximum priority
> request is no longer available for dequeuing (it completed or is even
> executing on another engine), we have no knowledge of the previous
> queue_priority as it would require us to keep a full history of enqueued
> requests -- but we already have that history in the priolists!
> 
> Rename the queue_priority to queue_priority_hint so that we do not
> confuse it as being exactly the maximum priority in the queue, but merely
> an indication that we have seen a new maximum priority value and as such
> we should check whether it should preempt the currently running request.
> 
> v2: s/preempt_priority_hint/queue_priority_hint/ as preempt implies it
> being only used for the singular task of preemption and not the wider
> question of waking up due to a change in the queue.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Twas,
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
-Chris