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diff --git a/src/mem/ruby/structures/MemoryNode.hh b/src/mem/ruby/structures/MemoryNode.hh
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+/*
+ * Copyright (c) 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.
+ */
+
+/*
+ * Description:
+ * This structure records everything known about a single
+ * memory request that is queued in the memory controller.
+ * It is created when the memory request first arrives
+ * at a memory controller and is deleted when the underlying
+ * message is enqueued to be sent back to the directory.
+ */
+
+#ifndef __MEM_RUBY_SYSTEM_MEMORYNODE_HH__
+#define __MEM_RUBY_SYSTEM_MEMORYNODE_HH__
+
+#include <iostream>
+
+#include "mem/ruby/common/TypeDefines.hh"
+#include "mem/ruby/slicc_interface/Message.hh"
+
+class MemoryNode
+{
+  public:
+    // old constructor
+    MemoryNode(const Cycles& time, int counter, const MsgPtr& msgptr,
+               const physical_address_t addr, const bool is_mem_read)
+        : m_time(time)
+    {
+        m_msg_counter = counter;
+        m_msgptr = msgptr;
+        m_addr = addr;
+        m_is_mem_read = is_mem_read;
+        m_is_dirty_wb = !is_mem_read;
+    }
+
+    // new constructor
+    MemoryNode(const Cycles& time, const MsgPtr& msgptr,
+               const physical_address_t addr, const bool is_mem_read,
+               const bool is_dirty_wb)
+        : m_time(time)
+    {
+        m_msg_counter = 0;
+        m_msgptr = msgptr;
+        m_addr = addr;
+        m_is_mem_read = is_mem_read;
+        m_is_dirty_wb = is_dirty_wb;
+    }
+
+    void print(std::ostream& out) const;
+
+    Cycles m_time;
+    int m_msg_counter;
+    MsgPtr m_msgptr;
+    physical_address_t m_addr;
+    bool m_is_mem_read;
+    bool m_is_dirty_wb;
+};
+
+inline std::ostream&
+operator<<(std::ostream& out, const MemoryNode& obj)
+{
+    obj.print(out);
+    out << std::flush;
+    return out;
+}
+
+#endif // __MEM_RUBY_SYSTEM_MEMORYNODE_HH__