diff -r ec595a5e793e -r 72a9b7284ccf hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp
--- a/hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp	Mon Mar 09 13:34:00 2009 -0700
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp	Thu Mar 12 18:16:36 2009 -0700
@@ -172,6 +172,9 @@
   develop(bool, G1RSBarrierUseQueue, true,                                  \
           "If true, use queueing RS barrier")                               \
                                                                             \
+  develop(bool, G1DeferredRSUpdate, true,                                   \
+          "If true, use deferred RS updates")                               \
+                                                                            \
   develop(bool, G1RSLogCheckCardTable, false,                               \
           "If true, verify that no dirty cards remain after RS log "        \
           "processing.")                                                    \