Adjust for pipeline stalls

Bug: 20853441

Calculating duration that crosses the UI-RT
sync point will now subtract out the time spent waiting
in queue under the assumption that this time will be
accounted for in the previous frame's metrics

Change-Id: Ia8213f4410638840613f5ae439e98dfb77532a6a

1 files changed, 2 insertions, 1 deletions

diff --git a/libs/hwui/renderthread/DrawFrameTask.cpp b/libs/hwui/renderthread/DrawFrameTask.cpp
index 008e2977b832..6507ce824e03 100644
--- a/libs/hwui/renderthread/DrawFrameTask.cpp
+++ b/libs/hwui/renderthread/DrawFrameTask.cpp
@@ -69,6 +69,7 @@ int DrawFrameTask::drawFrame() {
     LOG_ALWAYS_FATAL_IF(!mContext, "Cannot drawFrame with no CanvasContext!");
 
     mSyncResult = kSync_OK;
+    mSyncQueued = systemTime(CLOCK_MONOTONIC);
     postAndWait();
 
     return mSyncResult;
@@ -119,7 +120,7 @@ bool DrawFrameTask::syncFrameState(TreeInfo& info) {
         mContext->processLayerUpdate(mLayers[i].get());
     }
     mLayers.clear();
-    mContext->prepareTree(info, mFrameInfo);
+    mContext->prepareTree(info, mFrameInfo, mSyncQueued);
 
     // This is after the prepareTree so that any pending operations
     // (RenderNode tree state, prefetched layers, etc...) will be flushed.