FTL: Yield futures without overhead
ftl::yield, which lifts T to std::future<T>, incurs the cost of
allocating, ref counting, and locking the latter's shared state.
Consolidate the existing std::future extensions into ftl::Future,
and optimize ftl::yield by including static storage for T within.
Bug: 232436803
Test: simpleperf (-31% cycles in postFramebuffer)
Change-Id: I9a7ca7de17e7af10515de97d2f6a0dfa24e35d7a
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 1007043..7475510 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -620,7 +620,7 @@
void prepareCompositionState(compositionengine::LayerFE::StateSubset subset) override;
std::vector<compositionengine::LayerFE::LayerSettings> prepareClientCompositionList(
compositionengine::LayerFE::ClientCompositionTargetSettings&) override;
- void onLayerDisplayed(std::shared_future<FenceResult>) override;
+ void onLayerDisplayed(ftl::SharedFuture<FenceResult>) override;
void setWasClientComposed(const sp<Fence>& fence) override {
mLastClientCompositionFence = fence;