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

*** 63,76 ****
  
      private ZForwardingTable forwarding() {
          return (ZForwardingTable)VMObjectFactory.newObject(ZForwardingTable.class, addr.addOffsetTo(forwardingFieldOffset));
      }
  
!     private long start() {
          return virtual().start();
      }
  
      Address forward_object(Address from) {
          // Lookup address in forwarding table
          long from_offset = ZAddress.offset(from);
          long from_index = (from_offset - start()) >> object_alignment_shift();
          ZForwardingTableEntry entry = forwarding().find(from_index);
--- 63,80 ----
  
      private ZForwardingTable forwarding() {
          return (ZForwardingTable)VMObjectFactory.newObject(ZForwardingTable.class, addr.addOffsetTo(forwardingFieldOffset));
      }
  
!     long start() {
          return virtual().start();
      }
  
+     long size() {
+         return virtual().end() - virtual().start();
+     }
+ 
      Address forward_object(Address from) {
          // Lookup address in forwarding table
          long from_offset = ZAddress.offset(from);
          long from_index = (from_offset - start()) >> object_alignment_shift();
          ZForwardingTableEntry entry = forwarding().find(from_index);