--- old/src/os/posix/vm/os_posix.cpp	2016-08-15 19:49:08.133889400 -0700
+++ new/src/os/posix/vm/os_posix.cpp	2016-08-15 19:49:07.762390000 -0700
@@ -145,7 +145,7 @@
 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED,
 // so on posix, unmap the section at the start and at the end of the chunk that we mapped
 // rather than unmapping and remapping the whole chunk to get requested alignment.
-char* os::reserve_memory_aligned(size_t size, size_t alignment) {
+char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
   assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
       "Alignment must be a multiple of allocation granularity (page size)");
   assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
@@ -180,6 +180,11 @@
       os::release_memory(extra_base + begin_offset + size, end_offset);
   }
 
+  if (file_desc != -1) {
+    if (os::map_memory_to_file(aligned_base, size, file_desc) == NULL) {
+      vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
+    }
+  }
   return aligned_base;
 }