src/share/vm/gc/shared/genCollectedHeap.cpp

@@ -698,11 +698,11 @@
   }
   // When collection is parallel, all threads get to cooperate to do
   // older-gen scanning.
   if (level == 0) {
     older_gens->set_generation(_old_gen);
-    rem_set()->younger_refs_iterate(_old_gen, older_gens);
+    rem_set()->younger_refs_iterate(_old_gen, older_gens, scope->n_threads());
     older_gens->reset_generation();
   }
 
   _process_strong_tasks->all_tasks_completed(scope->n_threads());
 }