SF: Do not duplicate fences per layer per frame
Convert the unique_fd of RenderEngineResult (and futures thereof) into
sp<Fence> such that postFramebuffer does not duplicate release/present
fences.
Remove a few copies of shared futures/pointers with std::move.
Bug: 232436803
Test: simpleperf (-33% cycles in sys_dup)
Change-Id: Ia7c6c8333a712441f3612fb5c720ea2932799636
diff --git a/services/surfaceflinger/BufferQueueLayer.cpp b/services/surfaceflinger/BufferQueueLayer.cpp
index 926aa1d..6a1a38b 100644
--- a/services/surfaceflinger/BufferQueueLayer.cpp
+++ b/services/surfaceflinger/BufferQueueLayer.cpp
@@ -48,9 +48,8 @@
// Interface implementation for Layer
// -----------------------------------------------------------------------
-void BufferQueueLayer::onLayerDisplayed(
- std::shared_future<renderengine::RenderEngineResult> futureRenderEngineResult) {
- sp<Fence> releaseFence = new Fence(dup(futureRenderEngineResult.get().drawFence));
+void BufferQueueLayer::onLayerDisplayed(std::shared_future<FenceResult> futureFenceResult) {
+ const sp<Fence> releaseFence = futureFenceResult.get().value_or(Fence::NO_FENCE);
mConsumer->setReleaseFence(releaseFence);
// Prevent tracing the same release multiple times.