diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.cpp b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
index c82b0c4..034a394 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -602,7 +602,7 @@
     return mDisplayData[displayId].lastPresentFence;
 }
 
-bool HWComposer::retireFenceRepresentsStartOfScanout() const {
+bool HWComposer::presentFenceRepresentsStartOfScanout() const {
     return mAdapter ? false : true;
 }
 
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.h b/services/surfaceflinger/DisplayHardware/HWComposer.h
index e63bdd4..2713505 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.h
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.h
@@ -121,10 +121,10 @@
     // get the present fence received from the last call to present.
     sp<Fence> getPresentFence(int32_t displayId) const;
 
-    // Returns true if the retire fence represents the start of the display
+    // Returns true if the present fence represents the start of the display
     // controller's scan out. This should be true for all HWC2 implementations,
     // except for the wrapper around HWC1 implementations.
-    bool retireFenceRepresentsStartOfScanout() const;
+    bool presentFenceRepresentsStartOfScanout() const;
 
     // Get last release fence for the given layer
     sp<Fence> getLayerReleaseFence(int32_t displayId,
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
index 0511df2..6a98f03 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
@@ -281,7 +281,7 @@
 #endif
                     &qbo);
             if (result == NO_ERROR) {
-                updateQueueBufferOutput(qbo);
+                updateQueueBufferOutput(std::move(qbo));
             }
         } else {
             // If the surface hadn't actually been updated, then we only went
@@ -516,7 +516,8 @@
         mOutputFence = mFbFence;
     }
 
-    *output = mQueueBufferOutput;
+    // This moves the frame timestamps and keeps a copy of all other fields.
+    *output = std::move(mQueueBufferOutput);
     return NO_ERROR;
 }
 
@@ -555,8 +556,9 @@
     status_t result = mSource[SOURCE_SINK]->connect(listener, api,
             producerControlledByApp, &qbo);
     if (result == NO_ERROR) {
-        updateQueueBufferOutput(qbo);
-        *output = mQueueBufferOutput;
+        updateQueueBufferOutput(std::move(qbo));
+        // This moves the frame timestamps and keeps a copy of all other fields.
+        *output = std::move(mQueueBufferOutput);
     }
     return result;
 }
@@ -615,8 +617,8 @@
 }
 
 void VirtualDisplaySurface::updateQueueBufferOutput(
-        const QueueBufferOutput& qbo) {
-    mQueueBufferOutput = qbo;
+        QueueBufferOutput&& qbo) {
+    mQueueBufferOutput = std::move(qbo);
     mQueueBufferOutput.transformHint = 0;
 }
 
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
index b435bf5..d37dc0a 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
@@ -136,7 +136,7 @@
     static Source fbSourceForCompositionType(CompositionType type);
     status_t dequeueBuffer(Source source, PixelFormat format, uint32_t usage,
             int* sslot, sp<Fence>* fence);
-    void updateQueueBufferOutput(const QueueBufferOutput& qbo);
+    void updateQueueBufferOutput(QueueBufferOutput&& qbo);
     void resetPerFrameState();
     status_t refreshOutputBuffer();
 
@@ -181,6 +181,8 @@
     // The QueueBufferOutput with the latest info from the sink, and with the
     // transform hint cleared. Since we defer queueBuffer from the GLES driver
     // to the sink, we have to return the previous version.
+    // Moves instead of copies are performed to avoid duplicate
+    // FrameEventHistoryDeltas.
     QueueBufferOutput mQueueBufferOutput;
 
     // Details of the current sink buffer. These become valid when a buffer is