diff -r f04a848c6f00 -r cb5d2d4453d0 src/hotspot/share/gc/shared/generation.hpp
--- a/src/hotspot/share/gc/shared/generation.hpp	Thu Nov 30 08:35:33 2017 -0800
+++ b/src/hotspot/share/gc/shared/generation.hpp	Thu Nov 30 13:40:07 2017 +0100
@@ -58,6 +58,7 @@
 //
 
 class DefNewGeneration;
+class GCMemoryManager;
 class GenerationSpec;
 class CompactibleSpace;
 class ContiguousSpace;
@@ -86,6 +87,8 @@
   MemRegion _prev_used_region; // for collectors that want to "remember" a value for
                                // used region at some specific point during collection.
 
+  GCMemoryManager* _gc_manager;
+
  protected:
   // Minimum and maximum addresses for memory reserved (not necessarily
   // committed) for generation.
@@ -554,6 +557,16 @@
   // Performance Counter support
   virtual void update_counters() = 0;
   virtual CollectorCounters* counters() { return _gc_counters; }
+
+  GCMemoryManager* gc_manager() const {
+    assert(_gc_manager != NULL, "not initialized yet");
+    return _gc_manager;
+  }
+
+  void set_gc_manager(GCMemoryManager* gc_manager) {
+    _gc_manager = gc_manager;
+  }
+
 };
 
 #endif // SHARE_VM_GC_SHARED_GENERATION_HPP