Tweak RT-animator scheduling
Bug: 18226391
The issue occurs as a result of a dispatchFrame itself
taking longer than 12ms, the alloted budget. The result
is that a vsync request (which occured at the end) would
miss the vsync that occured 1ms prior to the end of the frame.
As a result it would end up waiting for the following vsync,
essentially dropping to 30fps even though 60 could have been
sustained.
Fix this with a few tweaks.
First, adjust the UI thread's delay bias from (now + 4ms) to
(vsync + 4ms), this prevents RT animators from slowly drifting
if the vsync occurs mid-task.
Second, request a vsync preemptively prior to running callbacks.
This way if any callbacks needs the next vsync and it takes
"too long", we will catch that vsync.
Finally, fix an issue where the display event queue was always
drained & rejected at the end of a task loop. Instead, drain
and reject all stale vsyncs. This still prevents the issue of
both UI thread & RT thread trying to drive 2 frames in a single
pulse, but also allows RT to notice that it missed a vsync
pulse it needed and that it should speed-up a bit in response
Change-Id: I9d6be037737e9283297898cac2e3563453e797cd
diff --git a/libs/hwui/renderthread/RenderThread.h b/libs/hwui/renderthread/RenderThread.h
index 4126d02..99c2e15 100644
--- a/libs/hwui/renderthread/RenderThread.h
+++ b/libs/hwui/renderthread/RenderThread.h
@@ -75,7 +75,7 @@
// and will delete them after they are run
ANDROID_API void queue(RenderTask* task);
ANDROID_API void queueAtFront(RenderTask* task);
- void queueDelayed(RenderTask* task, int delayMs);
+ void queueAt(RenderTask* task, nsecs_t runAtNs);
void remove(RenderTask* task);
// Mimics android.view.Choreographer
@@ -103,7 +103,7 @@
void initThreadLocals();
void initializeDisplayEventReceiver();
static int displayEventReceiverCallback(int fd, int events, void* data);
- void drainDisplayEventQueue(bool skipCallbacks = false);
+ void drainDisplayEventQueue();
void dispatchFrameCallbacks();
void requestVsync();