--- old/src/share/vm/memory/virtualspace.hpp	2016-12-12 09:51:37.070525844 -0800
+++ new/src/share/vm/memory/virtualspace.hpp	2016-12-12 09:51:36.990525845 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, 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
@@ -37,6 +37,7 @@
   size_t _noaccess_prefix;
   size_t _alignment;
   bool   _special;
+  int    _backing_fd;
  private:
   bool   _executable;
 
@@ -111,7 +112,7 @@
   void establish_noaccess_prefix();
  public:
   // Constructor. Tries to find a heap that is good for compressed oops.
-  ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large);
+  ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* backingFSforHeap = NULL);
   // Returns the base to be used for compression, i.e. so that null can be
   // encoded safely and implicit null checks can work.
   char *compressed_oop_base() { return _base - _noaccess_prefix; }