--- old/src/hotspot/share/memory/virtualspace.hpp	2018-11-08 13:48:42.386374873 -0800
+++ new/src/hotspot/share/memory/virtualspace.hpp	2018-11-08 13:48:41.930374892 -0800
@@ -38,6 +38,7 @@
   size_t _alignment;
   bool   _special;
   int    _fd_for_heap;
+  size_t _actual_page_size;
  private:
   bool   _executable;
 
@@ -48,6 +49,7 @@
   void initialize(size_t size, size_t alignment, bool large,
                   char* requested_address,
                   bool executable);
+  void update_actual_page_size(bool large_page);
 
  public:
   // Constructor
@@ -70,6 +72,7 @@
   bool   executable()      const { return _executable;   }
   size_t noaccess_prefix() const { return _noaccess_prefix;   }
   bool is_reserved()       const { return _base != NULL; }
+  size_t actual_page_size() const { return _actual_page_size; }
   void release();
 
   // Splitting