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diff --git a/src/mem/ruby/common/Histogram.hh b/src/mem/ruby/common/Histogram.hh
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+
+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ *
+ * Description: The histogram class implements a simple histogram
+ *
+ */
+
+#ifndef HISTOGRAM_H
+#define HISTOGRAM_H
+
+#include "mem/ruby/common/Global.hh"
+#include "mem/gems_common/Vector.hh"
+
+class Histogram {
+public:
+  // Constructors
+  Histogram(int binsize = 1, int bins = 50);
+
+  // Destructor
+  ~Histogram();
+
+  // Public Methods
+
+  void add(int64 value);
+  void add(const Histogram& hist);
+  void clear() { clear(m_bins); }
+  void clear(int bins);
+  void clear(int binsize, int bins);
+  int64 size() const { return m_count; }
+  int getBins() const { return m_bins; }
+  int getBinSize() const { return m_binsize; }
+  int64 getTotal() const { return m_sumSamples; }
+  int64 getData(int index) const { return m_data[index]; }
+
+  void printWithMultiplier(ostream& out, double multiplier) const;
+  void printPercent(ostream& out) const;
+  void print(ostream& out) const;
+private:
+  // Private Methods
+
+  // Private copy constructor and assignment operator
+  //  Histogram(const Histogram& obj);
+  //  Histogram& operator=(const Histogram& obj);
+
+  // Data Members (m_ prefix)
+  Vector<int64> m_data;
+  int64 m_max;          // the maximum value seen so far
+  int64 m_count;                // the number of elements added
+  int m_binsize;                // the size of each bucket
+  int m_bins;           // the number of buckets
+  int m_largest_bin;      // the largest bin used
+
+  int64 m_sumSamples;   // the sum of all samples
+  int64 m_sumSquaredSamples; // the sum of the square of all samples
+
+  double getStandardDeviation() const;
+};
+
+bool node_less_then_eq(const Histogram* n1, const Histogram* n2);
+
+// Output operator declaration
+ostream& operator<<(ostream& out, const Histogram& obj);
+
+// ******************* Definitions *******************
+
+// Output operator definition
+extern inline
+ostream& operator<<(ostream& out, const Histogram& obj)
+{
+  obj.print(out);
+  out << flush;
+  return out;
+}
+
+#endif //HISTOGRAM_H