--- old/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-10-08 18:33:11.000000000 -0400
+++ new/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-10-08 18:33:11.000000000 -0400
@@ -929,6 +929,8 @@
   _gc_tracer_cm->report_gc_start(GCCause::_no_gc /* first parameter is not used */, _gc_timer_cm->gc_start());
 
   _g1h->trace_heap_before_gc(_gc_tracer_cm);
+  // Record start, but take no time
+  TraceConcMemoryManagerStats tms(TraceConcMemoryManagerStats::CycleStart, _g1h->gc_cause());
 }
 
 void G1ConcurrentMark::concurrent_cycle_end() {
@@ -944,6 +946,8 @@
   _gc_timer_cm->register_gc_end();
 
   _gc_tracer_cm->report_gc_end(_gc_timer_cm->gc_end(), _gc_timer_cm->time_partitions());
+  // Record end, but take no time
+  TraceConcMemoryManagerStats tms(TraceConcMemoryManagerStats::CycleEnd, _g1h->gc_cause());
 }
 
 void G1ConcurrentMark::mark_from_roots() {
@@ -1121,6 +1125,8 @@
     return;
   }
 
+  TraceConcMemoryManagerStats tms(TraceConcMemoryManagerStats::Remark, _g1h->gc_cause());
+
   G1Policy* g1p = _g1h->g1_policy();
   g1p->record_concurrent_mark_remark_start();
 
@@ -1337,6 +1343,8 @@
     return;
   }
 
+  TraceConcMemoryManagerStats tms(TraceConcMemoryManagerStats::Cleanup, _g1h->gc_cause());
+
   G1Policy* g1p = _g1h->g1_policy();
   g1p->record_concurrent_mark_cleanup_start();