--- old/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	2018-05-02 11:08:54.269888533 +0200
+++ new/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	2018-05-02 11:08:53.986879852 +0200
@@ -113,8 +113,6 @@
   _gc_par_phases[YoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Young Free Collection Set (ms):");
   _gc_par_phases[NonYoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Non-Young Free Collection Set (ms):");
 
-  _gc_par_phases[PreserveCMReferents] = new WorkerDataArray<double>(max_gc_threads, "Parallel Preserve CM Refs (ms):");
-
   reset();
 }
 
@@ -399,9 +397,6 @@
 
   debug_time("Code Roots Fixup", _cur_collection_code_root_fixup_time_ms);
 
-  debug_time("Preserve CM Refs", _recorded_preserve_cm_referents_time_ms);
-  trace_phase(_gc_par_phases[PreserveCMReferents]);
-
   debug_time_for_reference("Reference Processing", _cur_ref_proc_time_ms);
   _ref_phase_times.print_all_references(2, false);