--- old/hotspot/src/share/vm/memory/heap.cpp	2009-08-01 04:12:18.451811773 +0100
+++ new/hotspot/src/share/vm/memory/heap.cpp	2009-08-01 04:12:18.374765178 +0100
@@ -2,7 +2,7 @@
 #pragma ident "@(#)heap.cpp	1.55 07/10/04 10:49:31 JVM"
 #endif
 /*
- * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -105,8 +105,9 @@
   _log2_segment_size = exact_log2(segment_size);
 
   // Reserve and initialize space for _memory.
-  const size_t page_size = os::page_size_for_region(committed_size,
-						    reserved_size, 8);
+  const size_t page_size = os::can_execute_large_page_memory() ?
+          os::page_size_for_region(committed_size, reserved_size, 8) :
+          os::vm_page_size();
   const size_t granularity = os::vm_allocation_granularity();
   const size_t r_align = MAX2(page_size, granularity);
   const size_t r_size = align_size_up(reserved_size, r_align);
@@ -114,7 +115,7 @@
   
   const size_t rs_align = page_size == (size_t) os::vm_page_size() ? 0 :
     MAX2(page_size, granularity);
-  ReservedSpace rs(r_size, rs_align, false);
+  ReservedSpace rs(r_size, rs_align, rs_align > 0);
   os::trace_page_sizes("code heap", committed_size, reserved_size, page_size,
 		       rs.base(), rs.size());
   if (!_memory.initialize(rs, c_size)) {