BufferQueue/SF: Add OccupancyTracker
Adds an OccupancyTracker to BufferQueue. This module keeps track of
how many buffers are in the queue over time, which, in combination
with various aggregation of these statistics, allows SurfaceFlinger
to report what fraction of the time a given layer was double- or
triple-buffered.
Change-Id: Ida6e967dc5483c00a633e9fe03998e420dd88502
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 7d085a4..79750a6 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -274,9 +274,10 @@
bool onPreComposition();
/*
- * called after composition.
+ * called after composition.
+ * returns true if the layer latched a new buffer this frame.
*/
- void onPostComposition();
+ bool onPostComposition();
#ifdef USE_HWC2
// If a buffer was replaced this frame, release the former buffer
@@ -406,6 +407,8 @@
bool* outIsGlesComposition, nsecs_t* outPostedTime,
sp<Fence>* outAcquireFence, sp<Fence>* outPrevReleaseFence) const;
+ std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
+
protected:
// constant
sp<SurfaceFlinger> mFlinger;