commit 40845df1285b387bcbf8f43ac72228eee2606d80
author Pablo Ceballos <pceballos@google.com> Mon Jan 25 17:41:15 2016 -0800
committer Pablo Ceballos <pceballos@google.com> Mon Mar 21 16:06:17 2016 -0700
tree 013720a404ed609b96d59a3e02f53dc36c122e1b
parent b49576d5241859a3cf03c9f34b8030ad25d3806b

SF: Add FenceTracker

FenceTracker tracks all fences in SurfaceFlinger. These timestamps
could be used for debugging, profiling, or be exposed to the
application.

Change-Id: I4297a661c0a7530e744168ac7a2a66c4bca92fd5

services/surfaceflinger/SurfaceFlinger_hwc1.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger_hwc1.cpp b/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
index d864874..6c68777 100644
--- a/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
+++ b/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
@@ -927,6 +927,7 @@
 void SurfaceFlinger::handleMessageRefresh() {
     ATRACE_CALL();
 
+    nsecs_t refreshStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
     static nsecs_t previousExpectedPresent = 0;
     nsecs_t expectedPresent = mPrimaryDispSync.computeNextRefresh(0);
     static bool previousFrameMissed = false;
@@ -947,7 +948,7 @@
         setUpHWComposer();
         doDebugFlashRegions();
         doComposition();
-        postComposition();
+        postComposition(refreshStartTime);
     }
 
     previousExpectedPresent = mPrimaryDispSync.computeNextRefresh(0);
@@ -1008,7 +1009,7 @@
     }
 }
 
-void SurfaceFlinger::postComposition()
+void SurfaceFlinger::postComposition(nsecs_t refreshStartTime)
 {
     const LayerVector& layers(mDrawingState.layersSortedByZ);
     const size_t count = layers.size();
@@ -1034,6 +1035,9 @@
         }
     }
 
+    mFenceTracker.addFrame(refreshStartTime, presentFence,
+            hw->getVisibleLayersSortedByZ(), hw->getClientTargetAcquireFence());
+
     if (mAnimCompositionPending) {
         mAnimCompositionPending = false;
 
@@ -2577,6 +2581,13 @@
                 dumpStaticScreenStats(result);
                 dumpAll = false;
             }
+
+            if ((index < numArgs) &&
+                    (args[index] == String16("--fences"))) {
+                index++;
+                mFenceTracker.dump(&result);
+                dumpAll = false;
+            }
         }
 
         if (dumpAll) {