Added LatencyTimer to ease latency measurements
new file: core/java/android/os/LatencyTimer.java
modified: core/java/android/view/MotionEvent.java
modified: core/java/android/view/ViewRoot.java
modified: services/java/com/android/server/InputDevice.java
modified: services/java/com/android/server/KeyInputQueue.java
modified: services/java/com/android/server/WindowManagerService.java
diff --git a/core/java/android/view/ViewRoot.java b/core/java/android/view/ViewRoot.java
index 7cd65e2..d999119 100644
--- a/core/java/android/view/ViewRoot.java
+++ b/core/java/android/view/ViewRoot.java
@@ -77,6 +77,9 @@
private static final boolean DEBUG_IMF = false || LOCAL_LOGV;
private static final boolean WATCH_POINTER = false;
+ private static final boolean MEASURE_LATENCY = false;
+ private static LatencyTimer lt;
+
/**
* Maximum time we allow the user to roll the trackball enough to generate
* a key event, before resetting the counters.
@@ -192,6 +195,10 @@
public ViewRoot(Context context) {
super();
+ if (MEASURE_LATENCY && lt == null) {
+ lt = new LatencyTimer(100, 1000);
+ }
+
++sInstanceCount;
// Initialize the statics when this class is first instantiated. This is
@@ -1579,7 +1586,17 @@
boolean didFinish;
if (event == null) {
try {
+ long timeBeforeGettingEvents;
+ if (MEASURE_LATENCY) {
+ timeBeforeGettingEvents = System.nanoTime();
+ }
+
event = sWindowSession.getPendingPointerMove(mWindow);
+
+ if (MEASURE_LATENCY && event != null) {
+ lt.sample("9 Client got events ", System.nanoTime() - event.getEventTimeNano());
+ lt.sample("8 Client getting events ", timeBeforeGettingEvents - event.getEventTimeNano());
+ }
} catch (RemoteException e) {
}
didFinish = true;
@@ -1603,7 +1620,13 @@
captureMotionLog("captureDispatchPointer", event);
}
event.offsetLocation(0, mCurScrollY);
+ if (MEASURE_LATENCY) {
+ lt.sample("A Dispatching TouchEvents", System.nanoTime() - event.getEventTimeNano());
+ }
handled = mView.dispatchTouchEvent(event);
+ if (MEASURE_LATENCY) {
+ lt.sample("B Dispatched TouchEvents ", System.nanoTime() - event.getEventTimeNano());
+ }
if (!handled && isDown) {
int edgeSlop = mViewConfiguration.getScaledEdgeSlop();
@@ -2685,7 +2708,11 @@
public void dispatchPointer(MotionEvent event, long eventTime) {
final ViewRoot viewRoot = mViewRoot.get();
- if (viewRoot != null) {
+ if (viewRoot != null) {
+ if (MEASURE_LATENCY) {
+ // Note: eventTime is in milliseconds
+ ViewRoot.lt.sample("* ViewRoot b4 dispatchPtr", System.nanoTime() - eventTime * 1000000);
+ }
viewRoot.dispatchPointer(event, eventTime);
} else {
new EventCompletion(mMainLooper, this, null, true, event);