diff -r 5bd93a49c640 -r 2cf90fac6e39 src/hotspot/share/runtime/task.hpp
--- a/src/hotspot/share/runtime/task.hpp	Thu Feb 14 01:25:04 2019 +0100
+++ b/src/hotspot/share/runtime/task.hpp	Thu Feb 14 11:33:45 2019 +0100
@@ -58,13 +58,6 @@
   // Can only be called by the WatcherThread
   static void real_time_tick(int delay_time);
 
-#ifndef PRODUCT
-  static elapsedTimer _timer;                      // measures time between ticks
-  static int _ticks;                               // total number of ticks
-  static int _intervalHistogram[max_interval];     // to check spacing of timer interrupts
- public:
-  static void print_intervals();
-#endif
   // Only the WatcherThread can cause us to execute PeriodicTasks
   friend class WatcherThread;
  public: