Chris Wilson <ch...@chris-wilson.co.uk> writes:
> If the request is still waiting on external fences, it has not yet been
> submitted to the HW queue and so we can forgo kicking the submission
> tasklet when re-evaluating its priority.
>
> This should have no impact other than reducing the number of tasklet
> wakeups under signal heavy workloads (e.g. switching between engines).
>
> v2: Use prebaked container_of()
>
> References: f6322eddaff7 ("drm/i915/preemption: Allow preemption between
> submission ports")
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Michał Winiarski <michal.winiar...@intel.com>
> Cc: Michel Thierry <michel.thie...@intel.com>
> Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_lrc.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c
> b/drivers/gpu/drm/i915/intel_lrc.c
> index b4ab06b05e58..104b69e0494f 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1051,12 +1051,16 @@ static void queue_request(struct intel_engine_cs
> *engine,
> list_add_tail(&pt->link, &lookup_priolist(engine, pt, prio)->requests);
> }
>
> -static void submit_queue(struct intel_engine_cs *engine, int prio)
> +static void __submit_queue(struct intel_engine_cs *engine, int prio)
> {
> - if (prio > engine->execlists.queue_priority) {
> engine->execlists.queue_priority = prio;
> tasklet_hi_schedule(&engine->execlists.tasklet);
> - }
> +}
> +
> +static void submit_queue(struct intel_engine_cs *engine, int prio)
> +{
> + if (prio > engine->execlists.queue_priority)
> + __submit_queue(engine, prio);
You did this...
> }
>
> static void execlists_submit_request(struct i915_request *request)
> @@ -1189,7 +1193,10 @@ static void execlists_schedule(struct i915_request
> *request, int prio)
> __list_del_entry(&pt->link);
> queue_request(engine, pt, prio);
> }
> - submit_queue(engine, prio);
> +
> + if (prio > engine->execlists.queue_priority &&
> + i915_sw_fence_done(&pt_to_request(pt)->submit))
> + __submit_queue(engine, prio);
..to have explicit priority comparison on submit callsite I gather.
Or is there some other reason?
-Mika
> }
>
> spin_unlock_irq(&engine->timeline->lock);
> --
> 2.16.3
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