diff -r 8d8c1012dacd -r 61b33cc6d3cf hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp
--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp	Wed May 07 22:06:42 2014 +0200
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp	Tue Apr 29 15:17:27 2014 +0200
@@ -33,6 +33,7 @@
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
+#include "runtime/orderAccess.inline.hpp"
 #include "utilities/taskqueue.hpp"
 
 // Inline functions for G1CollectedHeap
@@ -60,6 +61,19 @@
   return hr;
 }
 
+inline void G1CollectedHeap::reset_gc_time_stamp() {
+  _gc_time_stamp = 0;
+  OrderAccess::fence();
+  // Clear the cached CSet starting regions and time stamps.
+  // Their validity is dependent on the GC timestamp.
+  clear_cset_start_regions();
+}
+
+inline void G1CollectedHeap::increment_gc_time_stamp() {
+  ++_gc_time_stamp;
+  OrderAccess::fence();
+}
+
 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
   _old_set.remove(hr);
 }