--- a/src/share/vm/memory/heap.cpp	Mon Jan 23 12:21:06 2012 +0100
+++ b/src/share/vm/memory/heap.cpp	Tue Jan 24 19:17:28 2012 +0100
@@ -127,7 +127,7 @@
   assert(_number_of_reserved_segments >= _number_of_committed_segments, "just checking");
 
   // reserve space for _segmap
-  if (!_segmap.initialize(align_to_page_size(_number_of_reserved_segments), align_to_page_size(_number_of_committed_segments))) {
+  if (!_segmap.initialize(align_to_allocation_size(_number_of_reserved_segments), align_to_allocation_size(_number_of_committed_segments))) {
     return false;
   }
   assert(_segmap.committed_size() >= (size_t) _number_of_committed_segments, "could not commit  enough space for segment map");