--- /dev/null	2019-05-02 12:07:00.000000000 -0500
+++ new/src/hotspot/share/utilities/tableStatistics.hpp	2019-05-02 12:07:00.000000000 -0500
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2019, 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_UTILITIES_TABLE_STATISTICS_HPP
+#define SHARE_UTILITIES_TABLE_STATISTICS_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+#include "utilities/numberSeq.hpp"
+
+class TableRateStatistics : CHeapObj<mtStatistics> {
+
+  friend class TableStatistics;
+
+private:
+  volatile size_t _added_items;
+  volatile size_t _removed_items;
+
+  jlong _time_stamp;
+  double _seconds_stamp;
+  size_t _added_items_stamp;
+  size_t _added_items_stamp_prev;
+  size_t _removed_items_stamp;
+  size_t _removed_items_stamp_prev;
+
+public:
+  TableRateStatistics();
+  ~TableRateStatistics();
+
+  void add();
+  void remove();
+
+protected:
+  void stamp();
+  float get_add_rate();
+  float get_remove_rate();
+};
+
+class TableStatistics : CHeapObj<mtStatistics> {
+
+public:
+  size_t _literal_bytes;
+
+  size_t _number_of_buckets;
+  size_t _number_of_entries;
+
+  size_t _maximum_bucket_size;
+  float _average_bucket_size;
+  float _variance_of_bucket_size;
+  float _stddev_of_bucket_size;
+
+  size_t _bucket_bytes;
+  size_t _entry_bytes;
+  size_t _total_footprint;
+
+  size_t _bucket_size;
+  size_t _entry_size;
+
+  float _add_rate;
+  float _remove_rate;
+
+  TableStatistics();
+  TableStatistics(TableRateStatistics& rate_stats, NumberSeq summary, size_t literal_bytes, size_t bucket_bytes, size_t node_bytes);
+  ~TableStatistics();
+
+  void print(outputStream* st, const char *table_name);
+};
+
+#endif // SHARE_UTILITIES_TABLE_STATISTICS_HPP