--- a/Objects/frameobject.c	Mon Jul 02 13:54:33 2012 -0700
+++ b/Objects/frameobject.c	Tue Jul 03 03:43:34 2012 +0200
@@ -714,6 +714,15 @@
     f->f_lineno = code->co_firstlineno;
     f->f_iblock = 0;
 
+#ifdef WITH_DTRACE
+    /*
+    ** Cache UTF8 internally, available
+    ** for the pythonframe stack walker.
+    */
+    PyUnicode_AsUTF8(f->f_code->co_filename);
+    PyUnicode_AsUTF8(f->f_code->co_name);
+#endif
+
     _PyObject_GC_TRACK(f);
     return f;
 }