--- a/hotspot/src/share/vm/oops/methodDataOop.hpp	Tue Feb 08 16:12:16 2011 -0800
+++ b/hotspot/src/share/vm/oops/methodDataOop.hpp	Wed Feb 09 16:34:34 2011 -0800
@@ -1224,6 +1224,9 @@
   InvocationCounter _invocation_counter;
   // Same for backedges.
   InvocationCounter _backedge_counter;
+  // Counter values at the time profiling started.
+  int               _invocation_counter_start;
+  int               _backedge_counter_start;
   // Number of loops and blocks is computed when compiling the first
   // time with C1. It is used to determine if method is trivial.
   short             _num_loops;
@@ -1333,6 +1336,28 @@
     return backedge_counter()->count();
   }
 
+  int invocation_count_start() {
+    if (invocation_counter()->carry()) {
+      return 0;
+    }
+    return _invocation_counter_start;
+  }
+
+  int backedge_count_start() {
+    if (backedge_counter()->carry()) {
+      return 0;
+    }
+    return _backedge_counter_start;
+  }
+
+  int invocation_count_delta() { return invocation_count() - invocation_count_start(); }
+  int backedge_count_delta()   { return backedge_count()   - backedge_count_start();   }
+
+  void reset_start_counters() {
+    _invocation_counter_start = invocation_count();
+    _backedge_counter_start = backedge_count();
+  }
+
   InvocationCounter* invocation_counter()     { return &_invocation_counter; }
   InvocationCounter* backedge_counter()       { return &_backedge_counter;   }