--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Mon Mar 15 02:56:45 2010 -0700
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Thu Mar 11 11:44:43 2010 -0800
@@ -1055,7 +1055,12 @@
 
   // Returns "true" iff the given word_size is "very large".
   static bool isHumongous(size_t word_size) {
-    return word_size >= _humongous_object_threshold_in_words;
+    // Note this has to be strictly greater-than as the TLABs
+    // are capped at the humongous thresold and we want to
+    // ensure that we don't try to allocate a TLAB as
+    // humongous and that we don't allocate a humongous
+    // object in a TLAB.
+    return word_size > _humongous_object_threshold_in_words;
   }
 
   // Update mod union table with the set of dirty cards.