--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZGlobalsForVMStructs.java	2019-02-18 10:36:40.166827020 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZGlobalsForVMStructs.java	2019-02-18 10:36:39.658819209 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,6 +33,7 @@
 
 class ZGlobalsForVMStructs extends VMObject {
     private static AddressField ZGlobalPhaseField;
+    private static AddressField ZGlobalSeqNumField;
     private static AddressField ZAddressGoodMaskField;
     private static AddressField ZAddressBadMaskField;
     private static AddressField ZAddressWeakBadMaskField;
@@ -47,6 +48,7 @@
         Type type = db.lookupType("ZGlobalsForVMStructs");
 
         ZGlobalPhaseField = type.getAddressField("_ZGlobalPhase");
+        ZGlobalSeqNumField = type.getAddressField("_ZGlobalSeqNum");
         ZAddressGoodMaskField = type.getAddressField("_ZAddressGoodMask");
         ZAddressBadMaskField = type.getAddressField("_ZAddressBadMask");
         ZAddressWeakBadMaskField = type.getAddressField("_ZAddressWeakBadMask");
@@ -62,6 +64,10 @@
         return ZGlobalPhaseField.getValue(addr).getJIntAt(0);
     }
 
+    int ZGlobalSeqNum() {
+        return ZGlobalSeqNumField.getValue(addr).getJIntAt(0);
+    }
+
     long ZAddressGoodMask() {
         return ZAddressGoodMaskField.getValue(addr).getJLongAt(0);
     }