--- old/src/share/vm/memory/virtualspace.hpp	2016-06-03 17:55:55.651479000 -0700
+++ new/src/share/vm/memory/virtualspace.hpp	2016-06-03 17:55:55.338458500 -0700
@@ -37,6 +37,7 @@
   size_t _noaccess_prefix;
   size_t _alignment;
   bool   _special;
+  const char* _backingFileDir = NULL;
  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; }