--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/parallel/MutableSpace.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2003, 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package sun.jvm.hotspot.gc.parallel;
+
+import java.io.*;
+import java.util.*;
+
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.memory.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.types.*;
+
+public class MutableSpace extends ImmutableSpace {
+   static {
+      VM.registerVMInitializedObserver(new Observer() {
+         public void update(Observable o, Object data) {
+            initialize(VM.getVM().getTypeDataBase());
+         }
+      });
+   }
+
+   private static synchronized void initialize(TypeDataBase db) {
+      Type type = db.lookupType("MutableSpace");
+      topField    = type.getAddressField("_top");
+   }
+
+   public MutableSpace(Address addr) {
+      super(addr);
+   }
+
+   // Fields
+   private static AddressField topField;
+
+   // Accessors
+   public Address   top()          { return topField.getValue(addr);    }
+
+   /** In bytes */
+   public long used() {
+      return top().minus(bottom());
+   }
+
+   /** returns all MemRegions where live objects are */
+   public List/*<MemRegion>*/ getLiveRegions() {
+      List res = new ArrayList();
+      res.add(new MemRegion(bottom(), top()));
+      return res;
+   }
+
+   public void printOn(PrintStream tty) {
+      tty.print(" [" + bottom() + "," +
+                top() + "," + end() + "] ");
+   }
+}