*** old/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp	Tue Feb 19 11:00:18 2013
--- new/src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp	Tue Feb 19 11:00:17 2013

*** 143,152 ****
--- 143,153 ----
  #else /* USDT2 */
    HS_PRIVATE_CMS_INITMARK_BEGIN(
                                  );
  #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();
    GCCauseSetter gccs(gch, GCCause::_cms_initial_mark);