--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZCollectedHeap.java	2019-02-11 09:03:33.915718651 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZCollectedHeap.java	2019-02-11 09:03:33.539718664 +0100
@@ -70,6 +70,16 @@
         super(addr);
     }
 
+    @Override
+    public long capacity() {
+        return heap().capacity();
+    }
+
+    @Override
+    public long used() {
+        return heap().used();
+    }
+
     public OopHandle oop_load_at(OopHandle handle, long offset) {
         assert(!VM.getVM().isCompressedOopsEnabled());