--- old/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	Thu Mar 10 19:21:14 2011
+++ new/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	Thu Mar 10 19:21:14 2011
@@ -58,9 +58,7 @@
 
 void PSMarkSweep::initialize() {
   MemRegion mr = Universe::heap()->reserved_region();
-  _ref_processor = new ReferenceProcessor(mr,
-                                          true,    // atomic_discovery
-                                          false);  // mt_discovery
+  _ref_processor = new ReferenceProcessor(mr);     // a vanilla ref proc
   _counters = new CollectorCounters("PSMarkSweep", 1);
 }