Track slowest frames

Fixes: 27795291

Track the 10 slowest frames over the last 24 hours
to try and give approximate insight into total system health.

Change-Id: I8aa646cef0bea185d46b3c78478266bc01d17fd7

1 files changed, 8 insertions, 0 deletions

diff --git a/libs/hwui/JankTracker.h b/libs/hwui/JankTracker.h
index 3887e5e65d60..1a4a4897f496 100644
--- a/libs/hwui/JankTracker.h
+++ b/libs/hwui/JankTracker.h
@@ -39,6 +39,11 @@ enum JankType {
     NUM_BUCKETS,
 };
 
+struct SlowFrame {
+    uint16_t whenHours; // When this occurred in CLOCK_MONOTONIC in hours
+    uint16_t frametimeMs; // How long the frame took in ms
+};
+
 // Try to keep as small as possible, should match ASHMEM_SIZE in
 // GraphicsStatsService.java
 struct ProfileData {
@@ -49,6 +54,8 @@ struct ProfileData {
     uint32_t totalFrameCount;
     uint32_t jankFrameCount;
     nsecs_t statStartTime;
+
+    std::array<SlowFrame, 10> slowestFrames;
 };
 
 // TODO: Replace DrawProfiler with this
@@ -71,6 +78,7 @@ public:
 private:
     void freeData();
     void setFrameInterval(nsecs_t frameIntervalNanos);
+    void updateSlowest(const FrameInfo& frame);
 
     static uint32_t findPercentile(const ProfileData* data, int p);
     static void dumpData(const ProfileData* data, int fd);