am 519e91ef: Merge "Detect bad behavior earlier in Choreographer." into jb-dev (62007aba) · Commits · e / os / android_frameworks_base

core/java/android/view/Choreographer.java

+30 −3

Original line number	Diff line number	Diff line
		@@ -103,6 +103,11 @@ public final class Choreographer {
		private static final boolean USE_FRAME_TIME = SystemProperties.getBoolean(
		"debug.choreographer.frametime", true);

		// Set a limit to warn about skipped frames.
		// Skipped frames imply jank.
		private static final int SKIPPED_FRAME_WARNING_LIMIT = SystemProperties.getInt(
		"debug.choreographer.skipwarning", 30);

		private static final long NANOS_PER_MS = 1000000;

		private static final int MSG_DO_FRAME = 0;
		@@ -486,13 +491,18 @@ public final class Choreographer {
		startNanos = System.nanoTime();
		final long jitterNanos = startNanos - frameTimeNanos;
		if (jitterNanos >= mFrameIntervalNanos) {
		final long skippedFrames = jitterNanos / mFrameIntervalNanos;
		if (skippedFrames >= SKIPPED_FRAME_WARNING_LIMIT) {
		Log.w(TAG, "Skipped " + skippedFrames + " frames! "
		+ "The application may be doing too much work on its main thread.");
		}
		final long lastFrameOffset = jitterNanos % mFrameIntervalNanos;
		if (DEBUG) {
		Log.d(TAG, "Missed vsync by " + (jitterNanos * 0.000001f) + " ms "
		+ "which is more than the frame interval of "
		+ (mFrameIntervalNanos * 0.000001f) + " ms! "
		+ "Setting frame time to " + (lastFrameOffset * 0.000001f)
		+ " ms in the past.");
		+ "Skipping " + skippedFrames + " frames and setting frame "
		+ "time to " + (lastFrameOffset * 0.000001f) + " ms in the past.");
		}
		frameTimeNanos = startNanos - lastFrameOffset;
		}
		@@ -500,7 +510,7 @@ public final class Choreographer {
		if (frameTimeNanos < mLastFrameTimeNanos) {
		if (DEBUG) {
		Log.d(TAG, "Frame time appears to be going backwards. May be due to a "
		+ "previously skipped frame. Waiting for next vsync");
		+ "previously skipped frame. Waiting for next vsync.");
		}
		scheduleVsyncLocked();
		return;
		@@ -658,6 +668,7 @@ public final class Choreographer {

		private final class FrameDisplayEventReceiver extends DisplayEventReceiver
		implements Runnable {
		private boolean mHavePendingVsync;
		private long mTimestampNanos;
		private int mFrame;

		@@ -672,6 +683,21 @@ public final class Choreographer {
		// the message queue. If there are no messages in the queue with timestamps
		// earlier than the frame time, then the vsync event will be processed immediately.
		// Otherwise, messages that predate the vsync event will be handled first.
		long now = System.nanoTime();
		if (timestampNanos > now) {
		Log.w(TAG, "Frame time is " + ((timestampNanos - now) * 0.000001f)
		+ " ms in the future! Check that graphics HAL is generating vsync "
		+ "timestamps using the correct timebase.");
		timestampNanos = now;
		}

		if (mHavePendingVsync) {
		Log.w(TAG, "Already have a pending vsync event. There should only be "
		+ "one at a time.");
		} else {
		mHavePendingVsync = true;
		}

		mTimestampNanos = timestampNanos;
		mFrame = frame;
		Message msg = Message.obtain(mHandler, this);
		@@ -681,6 +707,7 @@ public final class Choreographer {

		@Override
		public void run() {
		mHavePendingVsync = false;
		doFrame(mTimestampNanos, mFrame);
		}
		}