--- old/src/hotspot/share/gc/z/zStat.hpp	2020-01-21 11:14:30.242186699 +0100
+++ new/src/hotspot/share/gc/z/zStat.hpp	2020-01-21 11:14:28.947160520 +0100
@@ -35,6 +35,7 @@
 #include "utilities/ticks.hpp"
 
 class ZPage;
+class ZRelocationSetSelectorGroupStats;
 class ZStatSampler;
 class ZStatSamplerHistory;
 struct ZStatCounterData;
@@ -418,11 +419,25 @@
 //
 class ZStatRelocation : public AllStatic {
 private:
-  static size_t _relocating;
-  static bool   _success;
-
-public:
-  static void set_at_select_relocation_set(size_t relocating);
+  struct Group {
+    size_t _npages;
+    size_t _total;
+    size_t _empty;
+    size_t _compacting_from;
+    size_t _compacting_to;
+  };
+
+  static Group _small;
+  static Group _medium;
+  static Group _large;
+  static bool  _success;
+
+  static void print(const char* name, const ZStatRelocation::Group& group);
+
+public:
+  static void set_at_select_relocation_set(const ZRelocationSetSelectorGroupStats& small,
+                                           const ZRelocationSetSelectorGroupStats& medium,
+                                           const ZRelocationSetSelectorGroupStats& large);
   static void set_at_relocate_end(bool success);
 
   static void print();
@@ -540,8 +555,9 @@
   static void set_at_mark_end(size_t capacity,
                               size_t allocated,
                               size_t used);
-  static void set_at_select_relocation_set(size_t live,
-                                           size_t garbage,
+  static void set_at_select_relocation_set(const ZRelocationSetSelectorGroupStats& small,
+                                           const ZRelocationSetSelectorGroupStats& medium,
+                                           const ZRelocationSetSelectorGroupStats& large,
                                            size_t reclaimed);
   static void set_at_relocate_start(size_t capacity,
                                     size_t allocated,