--- old/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2018-08-07 15:31:18.104650175 +0200
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2018-08-07 15:31:17.722638203 +0200
@@ -961,6 +961,7 @@
   virtual SoftRefPolicy* soft_ref_policy();
 
   virtual void initialize_serviceability();
+  virtual MemoryUsage memory_usage();
   virtual GrowableArray<GCMemoryManager*> memory_managers();
   virtual GrowableArray<MemoryPool*> memory_pools();