--- a/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	Wed Jul 17 16:33:19 2019 +0200
+++ b/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	Wed Jul 17 16:33:19 2019 +0200
@@ -164,6 +164,9 @@
   double _cur_merge_heap_roots_time_ms;
   double _cur_optional_merge_heap_roots_time_ms;
 
+  double _cur_prepare_merge_heap_roots_time_ms;
+  double _cur_optional_prepare_merge_heap_roots_time_ms;
+
   double _cur_prepare_tlab_time_ms;
   double _cur_resize_tlab_time_ms;
 
@@ -308,6 +311,14 @@
     _cur_optional_merge_heap_roots_time_ms += ms;
   }
 
+  void record_prepare_merge_heap_roots_time(double ms) {
+    _cur_prepare_merge_heap_roots_time_ms += ms;
+  }
+
+  void record_or_add_optional_prepare_merge_heap_roots_time(double ms) {
+    _cur_optional_prepare_merge_heap_roots_time_ms += ms;
+  }
+
   void record_evac_fail_recalc_used_time(double ms) {
     _cur_evac_fail_recalc_used = ms;
   }