diff -r 4ef5871a2c0b -r e236624d82f7 src/mem/ruby/system/System.hh
--- a/src/mem/ruby/system/System.hh	Thu Aug 05 21:20:08 2010 -0700
+++ b/src/mem/ruby/system/System.hh	Thu Aug 05 21:20:26 2010 -0700
@@ -125,6 +125,9 @@
 
     void print(std::ostream& out) const;
 
+    virtual void serialize(std::ostream &os);
+    virtual void unserialize(Checkpoint *cp, const std::string &section);
+
   private:
     // Private copy constructor and assignment operator
     RubySystem(const RubySystem& obj);
diff -r 4ef5871a2c0b -r e236624d82f7 src/mem/ruby/system/System.cc
--- a/src/mem/ruby/system/System.cc	Thu Aug 05 21:20:08 2010 -0700
+++ b/src/mem/ruby/system/System.cc	Thu Aug 05 21:20:26 2010 -0700
@@ -148,6 +148,23 @@
 }
 
 void
+RubySystem::serialize(std::ostream &os)
+{
+
+}
+
+void
+RubySystem::unserialize(Checkpoint *cp, const string &section)
+{
+    //
+    // The main purpose for clearing stats in the unserialize process is so
+    // that the profiler can correctly set its start time to the unserialized
+    // value of curTick
+    //
+    clearStats();
+}
+
+void
 RubySystem::clearStats() const
 {
     m_profiler_ptr->clearStats();