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drm/i915: Check for no-op priority changes first

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In all likelihood, the priority and node are already in the CPU cache
and by checking them first, we can avoid having to chase the
*request->hwsp for the current breadcrumb.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190513120102.29660-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-05-13 13:01:02 +01:00
parent 52c76fb18a
commit 190980187e
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_scheduler.c
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@ -200,10 +200,10 @@ static void __i915_schedule(struct i915_sched_node *node,
lockdep_assert_held(&schedule_lock);
GEM_BUG_ON(prio == I915_PRIORITY_INVALID);
if (node_signaled(node))
if (prio <= READ_ONCE(node->attr.priority))
return;
if (prio <= READ_ONCE(node->attr.priority))
if (node_signaled(node))
return;
stack.signaler = node;