diff -r e56c951d8735 -r 96e348cb0442 hotspot/src/share/vm/services/management.hpp
--- a/hotspot/src/share/vm/services/management.hpp	Wed Sep 23 22:04:23 2015 +0300
+++ b/hotspot/src/share/vm/services/management.hpp	Thu Sep 24 12:36:04 2015 +0200
@@ -118,6 +118,10 @@
   void start()
   { _timer.update_to(0); _begin_time = os::javaTimeMillis(); }
 
+  jlong begin_time() const {
+    return _begin_time;
+  }
+
   /**
    * Only call this if initialization completes successfully; it will
    * crash if PerfMemory_exit() has already been called (usually by