--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/generationCounters.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_GENERATIONCOUNTERS_HPP
+#define SHARE_VM_GC_SHARED_GENERATIONCOUNTERS_HPP
+
+#include "memory/virtualspace.hpp"
+#include "runtime/perfData.hpp"
+
+// A GenerationCounter is a holder class for performance counters
+// that track a generation
+
+class GenerationCounters: public CHeapObj<mtGC> {
+  friend class VMStructs;
+
+private:
+  void initialize(const char* name, int ordinal, int spaces,
+                  size_t min_capacity, size_t max_capacity,
+                  size_t curr_capacity);
+
+ protected:
+  PerfVariable*      _current_size;
+  VirtualSpace*      _virtual_space;
+
+  // Constant PerfData types don't need to retain a reference.
+  // However, it's a good idea to document them here.
+  // PerfStringConstant*     _name;
+  // PerfConstant*           _min_size;
+  // PerfConstant*           _max_size;
+  // PerfConstant*           _spaces;
+
+  char*              _name_space;
+
+  // This constructor is only meant for use with the PSGenerationCounters
+  // constructor. The need for such an constructor should be eliminated
+  // when VirtualSpace and PSVirtualSpace are unified.
+  GenerationCounters()
+             : _name_space(NULL), _current_size(NULL), _virtual_space(NULL) {}
+
+  // This constructor is used for subclasses that do not have a space
+  // associated with them (e.g, in G1).
+  GenerationCounters(const char* name, int ordinal, int spaces,
+                     size_t min_capacity, size_t max_capacity,
+                     size_t curr_capacity);
+
+ public:
+  GenerationCounters(const char* name, int ordinal, int spaces,
+                     size_t min_capacity, size_t max_capacity, VirtualSpace* v);
+
+  ~GenerationCounters() {
+    if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
+  }
+
+  virtual void update_all();
+
+  const char* name_space() const        { return _name_space; }
+
+};
+#endif // SHARE_VM_GC_SHARED_GENERATIONCOUNTERS_HPP