--- a/hotspot/src/share/vm/gc/shared/genCollectedHeap.cpp	Thu Aug 10 12:16:35 2017 -0700
+++ b/hotspot/src/share/vm/gc/shared/genCollectedHeap.cpp	Thu Aug 10 18:09:19 2017 -0700
@@ -387,7 +387,9 @@
     }
     gen->collect(full, clear_soft_refs, size, is_tlab);
     if (!rp->enqueuing_is_done()) {
-      rp->enqueue_discovered_references();
+      ReferenceProcessorPhaseTimes pt(NULL, rp->num_q());
+      rp->enqueue_discovered_references(NULL, &pt);
+      pt.print_enqueue_phase();
     } else {
       rp->set_enqueuing_is_done(false);
     }