--- old/src/hotspot/share/gc/z/zPhysicalMemory.hpp	2020-01-15 13:47:35.735409921 +0100
+++ new/src/hotspot/share/gc/z/zPhysicalMemory.hpp	2020-01-15 13:47:35.450404121 +0100
@@ -24,8 +24,9 @@
 #ifndef SHARE_GC_Z_ZPHYSICALMEMORY_HPP
 #define SHARE_GC_Z_ZPHYSICALMEMORY_HPP
 
+#include "gc/z/zMemory.hpp"
 #include "memory/allocation.hpp"
-#include OS_HEADER(gc/z/zPhysicalMemoryBacking)
+#include OS_HEADER(gc/z/zBackingFile)
 
 class ZPhysicalMemorySegment : public CHeapObj<mtGC> {
 private:
@@ -65,11 +66,17 @@
 
 class ZPhysicalMemoryManager {
 private:
-  ZPhysicalMemoryBacking _backing;
+  ZBackingFile   _backing;
+  ZMemoryManager _committed;
+  ZMemoryManager _uncommitted;
 
   void nmt_commit(const ZPhysicalMemory& pmem, uintptr_t offset) const;
   void nmt_uncommit(const ZPhysicalMemory& pmem, uintptr_t offset) const;
 
+  void pretouch_view(uintptr_t addr, size_t size) const;
+  void map_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
+  void unmap_view(const ZPhysicalMemory& pmem, uintptr_t addr) const;
+
 public:
   bool is_initialized() const;