--- old/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp	2013-02-19 11:00:18.000000000 +0100
+++ new/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp	2013-02-19 11:00:17.000000000 +0100
@@ -145,6 +145,7 @@
                                 );
 #endif /* USDT2 */
 
+  _collector->register_gc_start(GCCause::_cms_concurrent_mark);
   _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark", os::elapsed_counter());
 
   GenCollectedHeap* gch = GenCollectedHeap::heap();