From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Subject: [Intel-gfx] [PATCH 1/2] drm/i915/execlists: Shortcircuit queue_prio() for no internal levels
Date: Thu, 21 May 2020 18:33:47 +0100 [thread overview]
Message-ID: <20200521173348.27467-1-chris@chris-wilson.co.uk> (raw)
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@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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next reply other threads:[~2020-05-21 17:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 17:33 Chris Wilson [this message]
2020-05-21 17:33 ` [Intel-gfx] [PATCH 2/2] drm/i915: Improve execute_cb struct packing Chris Wilson
2020-05-21 19:00 ` [Intel-gfx] ✓ Fi.CI.BAT: success for series starting with [1/2] drm/i915/execlists: Shortcircuit queue_prio() for no internal levels Patchwork
2020-05-22 15:14 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
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