--- old/src/hotspot/os/aix/os_aix.cpp	2017-10-31 15:49:40.708728521 -0700
+++ new/src/hotspot/os/aix/os_aix.cpp	2017-10-31 15:49:40.483730226 -0700
@@ -2491,9 +2491,25 @@
   return false;
 }
 
+char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
+  assert(file_desc >= 0, "file_desc is not valid");
+  char* result = NULL;
+
+  // Always round to os::vm_page_size(), which may be larger than 4K.
+  bytes = align_up(bytes, os::vm_page_size());
+  result = reserve_mmaped_memory(bytes, requested_addr, 0);
+  
+  if (result != NULL) {
+    if (replace_existing_mapping_with_dax_file_mapping(result, bytes, file_desc) == NULL) {
+      vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
+    }
+  }
+  return result;
+}
+
 // Reserve memory at an arbitrary address, only if that area is
 // available (and not reserved for something else).
-char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, bool use_SHM) {
+char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
   char* addr = NULL;
 
   // Always round to os::vm_page_size(), which may be larger than 4K.
@@ -2504,7 +2520,7 @@
   if (os::vm_page_size() == 4*K) {
     return reserve_mmaped_memory(bytes, requested_addr, 0);
   } else {
-    if (use_SHM && bytes >= Use64KPagesThreshold) {
+    if (bytes >= Use64KPagesThreshold) {
       return reserve_shmated_memory(bytes, requested_addr, 0);
     } else {
       return reserve_mmaped_memory(bytes, requested_addr, 0);