--- old/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-08-07 15:31:16.540601157 +0200
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-08-07 15:31:16.122588056 +0200
@@ -4975,6 +4975,10 @@
   _g1mm->initialize_serviceability();
 }
 
+MemoryUsage G1CollectedHeap::memory_usage() {
+  return _g1mm->memory_usage();
+}
+
 GrowableArray<GCMemoryManager*> G1CollectedHeap::memory_managers() {
   return _g1mm->memory_managers();
 }