diff -r dfb38ea7da17 -r 3dc12ef8735e src/cpu/x86/vm/globals_x86.hpp
--- a/src/cpu/x86/vm/globals_x86.hpp	Thu Sep 30 12:05:08 2010 -0400
+++ b/src/cpu/x86/vm/globals_x86.hpp	Thu Oct 07 15:12:57 2010 -0400
@@ -63,3 +63,5 @@
 
 define_pd_global(bool, RewriteBytecodes,     true);
 define_pd_global(bool, RewriteFrequentPairs, true);
+
+define_pd_global(bool, UseMembar,            false);