[Intel-gfx] [PATCH 02/22] drm/i915/execlists: Shortcircuit queue_prio() for no internal levels
Chris Wilson
chris at chris-wilson.co.uk
Wed May 20 07:54:43 UTC 2020
If there are no internal levels and the user priority-shift is zero, we
can help the compiler eliminate some dead code:
Function old new delta
start_timeslice 169 154 -15
__execlists_submission_tasklet 4696 4659 -37
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index de5be57ed6d2..3214a4ecc31a 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -446,6 +446,9 @@ static int queue_prio(const struct intel_engine_execlists *execlists)
* we have to flip the index value to become priority.
*/
p = to_priolist(rb);
+ if (!I915_USER_PRIORITY_SHIFT)
+ return p->priority;
+
return ((p->priority + 1) << I915_USER_PRIORITY_SHIFT) - ffs(p->used);
}
--
2.20.1
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