diff -r 231e01457f13 -r 613f27cc37b9 hotspot/src/share/vm/gc/g1/g1RemSet.cpp
--- a/hotspot/src/share/vm/gc/g1/g1RemSet.cpp	Sun Feb 28 12:22:05 2016 -0500
+++ b/hotspot/src/share/vm/gc/g1/g1RemSet.cpp	Mon Feb 29 13:06:03 2016 +0100
@@ -238,7 +238,7 @@
   RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq);
 
   G1GCParPhaseTimesTracker x(_g1p->phase_times(), G1GCPhaseTimes::UpdateRS, worker_i);
-  {
+  if (ConcurrentG1Refine::hot_card_cache_enabled()) {
     // Apply the closure to the entries of the hot card cache.
     G1GCParPhaseTimesTracker y(_g1p->phase_times(), G1GCPhaseTimes::ScanHCC, worker_i);
     _g1->iterate_hcc_closure(&into_cset_update_rs_cl, worker_i);