diff -r bfb419c66ae9 -r a4cdca87152b src/hotspot/share/gc/z/zHeap.hpp
--- a/src/hotspot/share/gc/z/zHeap.hpp	Mon Oct 28 11:26:53 2019 +0100
+++ b/src/hotspot/share/gc/z/zHeap.hpp	Mon Oct 28 11:27:27 2019 +0100
@@ -63,9 +63,6 @@
   size_t heap_max_size() const;
   size_t heap_max_reserve_size() const;
 
-  void before_flip();
-  void after_flip();
-
   void flip_to_marked();
   void flip_to_remapped();
 
@@ -151,6 +148,7 @@
 
   // Iteration
   void object_iterate(ObjectClosure* cl, bool visit_weaks);
+  void pages_do(ZPageClosure* cl);
 
   // Serviceability
   void serviceability_initialize();