--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/g1/G1CollectedHeap.java	2017-08-31 23:38:12.467740478 +0900
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/g1/G1CollectedHeap.java	2017-08-31 23:38:12.348740085 +0900
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2017, 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
@@ -87,7 +87,7 @@
         return hrm().length();
     }
 
-    private HeapRegionManager hrm() {
+    public HeapRegionManager hrm() {
         Address hrmAddr = addr.addOffsetTo(hrmFieldOffset);
         return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class,
                                                          hrmAddr);