--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/gcStats.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2003, 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_GCSTATS_HPP
+#define SHARE_VM_GC_SHARED_GCSTATS_HPP
+
+#include "gc/shared/gcUtil.hpp"
+
+class GCStats : public CHeapObj<mtGC> {
+ protected:
+  // Avg amount promoted; used for avoiding promotion undo
+  // This class does not update deviations if the sample is zero.
+  AdaptivePaddedNoZeroDevAverage*   _avg_promoted;
+
+ public:
+  GCStats();
+
+  enum Name {
+    GCStatsKind,
+    CMSGCStatsKind
+  };
+
+  virtual Name kind() {
+    return GCStatsKind;
+  }
+
+  AdaptivePaddedNoZeroDevAverage*  avg_promoted() const { return _avg_promoted; }
+
+  // Average in bytes
+  size_t average_promoted_in_bytes() const {
+    return (size_t)_avg_promoted->average();
+  }
+
+  // Padded average in bytes
+  size_t padded_average_promoted_in_bytes() const {
+    return (size_t)_avg_promoted->padded_average();
+  }
+};
+
+class CMSGCStats : public GCStats {
+ public:
+  CMSGCStats();
+
+  virtual Name kind() {
+    return CMSGCStatsKind;
+  }
+};
+
+#endif // SHARE_VM_GC_SHARED_GCSTATS_HPP