--- old/share/gc/parallel/psOldGen.hpp	2018-06-15 09:47:38.842912466 -0700
+++ new/share/gc/parallel/psOldGen.hpp	2018-06-15 09:47:38.814912465 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, 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
@@ -59,6 +59,9 @@
   const size_t _min_gen_size;
   const size_t _max_gen_size;
 
+  // NVDIMM handle to expand/shrink old gen on NVDIMM.
+  int _nvdimm_fd;
+
   // Used when initializing the _name field.
   static inline const char* select_name();
 
@@ -137,7 +140,7 @@
   MemRegion reserved() const                { return _reserved; }
   virtual size_t max_gen_size()             { return _max_gen_size; }
   size_t min_gen_size()                     { return _min_gen_size; }
-
+  int nvdimm_fd()                           { return _nvdimm_fd; }
   // Returns limit on the maximum size of the generation.  This
   // is the same as _max_gen_size for PSOldGen but need not be
   // for a derived class.
@@ -218,6 +221,8 @@
   // Printing support
   virtual const char* name() const { return _name; }
 
+  // set up fd for NVDIMM
+  void setup_fd(int fd) {_nvdimm_fd = fd; }
   // Debugging support
   // Save the tops of all spaces for later use during mangling.
   void record_spaces_top() PRODUCT_RETURN;