--- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Wed Mar 28 16:39:32 2018 +0200
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Wed Mar 28 16:39:32 2018 +0200
@@ -262,8 +262,6 @@
   // If not, we can skip a few steps.
   bool _has_humongous_reclaim_candidates;
 
-  volatile uint _gc_time_stamp;
-
   G1HRPrinter _hr_printer;
 
   // It decides whether an explicit GC should start a concurrent cycle
@@ -972,21 +970,6 @@
   // Try to minimize the remembered set.
   void scrub_rem_set();
 
-  uint get_gc_time_stamp() {
-    return _gc_time_stamp;
-  }
-
-  inline void reset_gc_time_stamp();
-
-  void check_gc_time_stamps() PRODUCT_RETURN;
-
-  inline void increment_gc_time_stamp();
-
-  // Reset the given region's GC timestamp. If it's starts humongous,
-  // also reset the GC timestamp of its corresponding
-  // continues humongous regions too.
-  void reset_gc_time_stamps(HeapRegion* hr);
-
   // Apply the given closure on all cards in the Hot Card Cache, emptying it.
   void iterate_hcc_closure(CardTableEntryClosure* cl, uint worker_i);