Commit 19098018 authored May 13, 2019 by Chris Wilson

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



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

parent 52c76fb1

drivers/gpu/drm/i915/i915_scheduler.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;