--- old/src/hotspot/share/gc/shared/collectedHeap.hpp	2018-08-07 15:31:25.683887713 +0200
+++ new/src/hotspot/share/gc/shared/collectedHeap.hpp	2018-08-07 15:31:25.300875710 +0200
@@ -31,6 +31,7 @@
 #include "runtime/handles.hpp"
 #include "runtime/perfData.hpp"
 #include "runtime/safepoint.hpp"
+#include "services/memoryUsage.hpp"
 #include "utilities/debug.hpp"
 #include "utilities/events.hpp"
 #include "utilities/formatBuffer.hpp"
@@ -423,6 +424,7 @@
   // Return the SoftRefPolicy for the heap;
   virtual SoftRefPolicy* soft_ref_policy() = 0;
 
+  virtual MemoryUsage memory_usage();
   virtual GrowableArray<GCMemoryManager*> memory_managers() = 0;
   virtual GrowableArray<MemoryPool*> memory_pools() = 0;