--- a/src/hotspot/share/gc/g1/heapRegion.hpp	Wed Mar 28 16:39:32 2018 +0200
+++ b/src/hotspot/share/gc/g1/heapRegion.hpp	Wed Mar 28 16:39:32 2018 +0200
@@ -100,7 +100,6 @@
  protected:
   G1BlockOffsetTablePart _bot_part;
   Mutex _par_alloc_lock;
-  volatile uint _gc_time_stamp;
   // When we need to retire an allocation region, while other threads
   // are also concurrently trying to allocate into it, we typically
   // allocate a dummy object at the end of the region to ensure that
@@ -147,10 +146,6 @@
   void mangle_unused_area() PRODUCT_RETURN;
   void mangle_unused_area_complete() PRODUCT_RETURN;
 
-  void record_timestamp();
-  void reset_gc_time_stamp() { _gc_time_stamp = 0; }
-  uint get_gc_time_stamp() { return _gc_time_stamp; }
-
   // See the comment above in the declaration of _pre_dummy_top for an
   // explanation of what it is.
   void set_pre_dummy_top(HeapWord* pre_dummy_top) {