diff -r be6959017765 -r 4c471254865e hotspot/src/share/vm/opto/graphKit.cpp
--- a/hotspot/src/share/vm/opto/graphKit.cpp	Wed Oct 07 19:01:55 2009 -0400
+++ b/hotspot/src/share/vm/opto/graphKit.cpp	Fri Oct 16 02:05:46 2009 -0700
@@ -3186,6 +3186,15 @@
       return;
   }
 
+  if (use_ReduceInitialCardMarks()
+      && obj == just_allocated_object(control())) {
+    // We can skip marks on a freshly-allocated object in Eden.
+    // Keep this code in sync with maybe_defer_card_mark() in runtime.cpp.
+    // That routine informs GC to take appropriate compensating steps
+    // so as to make this card-mark elision safe.
+    return;
+  }
+
   if (!use_precise) {
     // All card marks for a (non-array) instance are in one place:
     adr = obj;