diff -r 8859772195c6 -r 0414c1049f15 src/share/vm/memory/cardTableModRefBS.hpp
--- a/src/share/vm/memory/cardTableModRefBS.hpp	Tue Feb 09 13:56:09 2010 -0800
+++ b/src/share/vm/memory/cardTableModRefBS.hpp	Thu Feb 11 15:52:19 2010 -0800
@@ -339,6 +339,16 @@
     return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val();
   }
 
+  void set_card_claimed(size_t card_index) {
+      jbyte val = _byte_map[card_index];
+      if (val == clean_card_val()) {
+        val = (jbyte)claimed_card_val();
+      } else {
+        val |= (jbyte)claimed_card_val();
+      }
+      _byte_map[card_index] = val;
+  }
+
   bool claim_card(size_t card_index);
 
   bool is_card_clean(size_t card_index) {