--- a/src/share/vm/oops/methodOop.hpp	Mon Mar 07 16:03:28 2011 -0500
+++ b/src/share/vm/oops/methodOop.hpp	Fri Mar 11 21:19:15 2011 -0800
@@ -84,6 +84,11 @@
 // | invocation_counter                                   |
 // | backedge_counter                                     |
 // |------------------------------------------------------|
+// |           prev_time (tiered only, 64 bit wide)       |
+// |                                                      |
+// |------------------------------------------------------|
+// |                  rate (tiered)                       |
+// |------------------------------------------------------|
 // | code                           (pointer)             |
 // | i2i                            (pointer)             |
 // | adapter                        (pointer)             |
@@ -124,6 +129,11 @@
   InvocationCounter _invocation_counter;         // Incremented before each activation of the method - used to trigger frequency-based optimizations
   InvocationCounter _backedge_counter;           // Incremented before each backedge taken - used to trigger frequencey-based optimizations
 
+#ifdef TIERED
+  jlong             _prev_time;                   // Previous time the rate was acquired
+  float             _rate;                        // Events (invocation and backedge counter increments) per millisecond
+#endif
+
 #ifndef PRODUCT
   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 #endif
@@ -304,6 +314,17 @@
   InvocationCounter* invocation_counter() { return &_invocation_counter; }
   InvocationCounter* backedge_counter()   { return &_backedge_counter; }
 
+#ifdef TIERED
+  // We are reusing interpreter_invocation_count as a holder for the previous event count!
+  // We can do that since interpreter_invocation_count is not used in tiered.
+  int prev_event_count() const                   { return _interpreter_invocation_count;  }
+  void set_prev_event_count(int count)           { _interpreter_invocation_count = count; }
+  jlong prev_time() const                        { return _prev_time; }
+  void set_prev_time(jlong time)                 { _prev_time = time; }
+  float rate() const                             { return _rate; }
+  void set_rate(float rate)                      { _rate = rate; }
+#endif
+
   int invocation_count();
   int backedge_count();