--- old/src/share/vm/runtime/os.hpp	2017-07-20 17:45:11.645275300 -0700
+++ new/src/share/vm/runtime/os.hpp	2017-07-20 17:45:11.237418800 -0700
@@ -107,8 +107,12 @@
   }
 
   static char*  pd_reserve_memory(size_t bytes, char* addr = 0,
-                               size_t alignment_hint = 0);
+                                  size_t alignment_hint = 0);
+  #if defined(AIX)
+    static char*  pd_attempt_reserve_memory_at(size_t bytes, char* addr, bool use_SHM = true);
+  #else
   static char*  pd_attempt_reserve_memory_at(size_t bytes, char* addr);
+  #endif
   static void   pd_split_reserved_memory(char *base, size_t size,
                                       size_t split, bool realloc);
   static bool   pd_commit_memory(char* addr, size_t bytes, bool executable);
@@ -301,11 +305,12 @@
 
   static int    vm_allocation_granularity();
   static char*  reserve_memory(size_t bytes, char* addr = 0,
-                               size_t alignment_hint = 0);
+                               size_t alignment_hint = 0, int file_desc = -1);
   static char*  reserve_memory(size_t bytes, char* addr,
                                size_t alignment_hint, MEMFLAGS flags);
-  static char*  reserve_memory_aligned(size_t size, size_t alignment);
-  static char*  attempt_reserve_memory_at(size_t bytes, char* addr);
+  static char*  reserve_memory_aligned(size_t size, size_t alignment, int file_desc = -1);
+  static char*  attempt_reserve_memory_at(size_t bytes, char* addr, int file_desc = -1);
+
   static void   split_reserved_memory(char *base, size_t size,
                                       size_t split, bool realloc);
   static bool   commit_memory(char* addr, size_t bytes, bool executable);
@@ -337,6 +342,13 @@
   static bool   pd_create_stack_guard_pages(char* addr, size_t bytes);
   static bool   remove_stack_guard_pages(char* addr, size_t bytes);
 
+  // Helper function to create a new file with template jvmheap.XXXXXX
+  static int create_file_for_heap(const char* dir, size_t size);
+  // map memory to the dax (direct access) file referred by fd
+  static char* map_memory_to_dax_file(char* base, size_t size, int fd);
+  // replace existing reserved memory with file mapping
+  static char* replace_existing_mapping_with_dax_file_mapping(char* base, size_t size, int fd);
+
   static char*  map_memory(int fd, const char* file_name, size_t file_offset,
                            char *addr, size_t bytes, bool read_only = false,
                            bool allow_exec = false);