src/hotspot/share/memory/virtualspace.hpp

*** 35,44 ****
--- 35,45 ----
    char*  _base;
    size_t _size;
    size_t _noaccess_prefix;
    size_t _alignment;
    bool   _special;
+   int    _fd_for_heap;
   private:
    bool   _executable;
  
    // ReservedSpace
    ReservedSpace(char* base, size_t size, size_t alignment, bool special,
*** 113,123 ****
    void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
    // Create protection page at the beginning of the space.
    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);
    // 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; }
  };
  
--- 114,126 ----
    void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
    // Create protection page at the beginning of the space.
    void establish_noaccess_prefix();
   public:
    // Constructor. Tries to find a heap that is good for compressed oops.
!   // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated
!   // on the device which is managed by the file system where the directory resides.
!   ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = 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; }
  };