src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZCollectedHeap.java

@@ -68,10 +68,20 @@
 
     public ZCollectedHeap(Address addr) {
         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());
 
         Address oopAddress = handle.getAddressAt(offset);