--- old/src/share/vm/gc/g1/g1CollectorPolicy.cpp	2015-11-11 15:16:28.166511816 +0100
+++ new/src/share/vm/gc/g1/g1CollectorPolicy.cpp	2015-11-11 15:16:28.082509321 +0100
@@ -1219,6 +1219,8 @@
   }
   _last_old_allocated_bytes = 0;
 
+  _ihop_control->send_event(_g1->gc_tracer_stw());
+
   // Note that _mmu_tracker->max_gc_time() returns the time in seconds.
   double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0;