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* [PATCH 1/5] drm/i915/execlists: Skip redundant resubmission
@ 2019-10-03 21:00 Chris Wilson
  2019-10-03 21:00 ` [PATCH 2/5] dma-fence: Serialise signal enabling (dma_fence_enable_sw_signaling) Chris Wilson
                   ` (10 more replies)
  0 siblings, 11 replies; 22+ messages in thread
From: Chris Wilson @ 2019-10-03 21:00 UTC (permalink / raw)
  To: intel-gfx; +Cc: dri-devel

If we unwind the active requests, and on resubmission discover that we
intend to preempt the active context with itself, simply skip the ELSP
submission.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 431d3b8c3371..3cfea1758fd2 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1739,11 +1739,26 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 
 	if (submit) {
 		*port = execlists_schedule_in(last, port - execlists->pending);
-		memset(port + 1, 0, (last_port - port) * sizeof(*port));
 		execlists->switch_priority_hint =
 			switch_prio(engine, *execlists->pending);
+
+		/*
+		 * Skip if we ended up with exactly the same set of requests,
+		 * e.g. trying to timeslice a pair of ordered contexts
+		 */
+		if (!memcmp(execlists->active, execlists->pending,
+			    (port - execlists->pending + 1) * sizeof(*port))) {
+			do
+				execlists_schedule_out(fetch_and_zero(port));
+			while (port-- != execlists->pending);
+
+			goto skip_submit;
+		}
+
+		memset(port + 1, 0, (last_port - port) * sizeof(*port));
 		execlists_submit_ports(engine);
 	} else {
+skip_submit:
 		ring_set_paused(engine, 0);
 	}
 }
-- 
2.23.0

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^ permalink raw reply related	[flat|nested] 22+ messages in thread

end of thread, other threads:[~2019-10-09 15:59 UTC | newest]

Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-03 21:00 [PATCH 1/5] drm/i915/execlists: Skip redundant resubmission Chris Wilson
2019-10-03 21:00 ` [PATCH 2/5] dma-fence: Serialise signal enabling (dma_fence_enable_sw_signaling) Chris Wilson
2019-10-04  8:31   ` Tvrtko Ursulin
2019-10-04 10:11   ` [PATCH] " Chris Wilson
2019-10-04 10:18     ` Tvrtko Ursulin
2019-10-03 21:00 ` [PATCH 3/5] drm/mm: Use helpers for drm_mm_node booleans Chris Wilson
2019-10-04  8:33   ` Tvrtko Ursulin
2019-10-03 21:00 ` [PATCH 4/5] drm/mm: Convert drm_mm_node booleans to bitops Chris Wilson
2019-10-04  8:34   ` Tvrtko Ursulin
2019-10-03 21:01 ` [PATCH 5/5] drm/mm: Use clear_bit_unlock() for releasing the drm_mm_node() Chris Wilson
2019-10-04  9:15   ` Tvrtko Ursulin
2019-10-04 11:07     ` Chris Wilson
2019-10-04 11:17       ` Chris Wilson
2019-10-04 12:01         ` [Intel-gfx] " Tvrtko Ursulin
2019-10-09 15:59           ` Daniel Vetter
2019-10-03 22:38 ` ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/execlists: Skip redundant resubmission Patchwork
2019-10-03 22:58 ` ✓ Fi.CI.BAT: success " Patchwork
2019-10-04 10:08 ` [PATCH 1/5] " Tvrtko Ursulin
2019-10-04 10:25 ` ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/5] drm/i915/execlists: Skip redundant resubmission (rev2) Patchwork
2019-10-04 11:36 ` ✓ Fi.CI.BAT: success " Patchwork
2019-10-04 11:53 ` ✗ Fi.CI.IGT: failure for series starting with [1/5] drm/i915/execlists: Skip redundant resubmission Patchwork
2019-10-04 17:01 ` ✗ Fi.CI.IGT: failure for series starting with [1/5] drm/i915/execlists: Skip redundant resubmission (rev2) Patchwork

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