--- ../../python/src/Python/ceval.c.orig	2011-11-17 15:54:06.287304375 -0500
+++ ../../python/src/Python/ceval.c	2011-11-17 15:57:42.875596649 -0500
@@ -19,6 +19,8 @@
 
 #include <ctype.h>
 
+#include <sys/sdt.h>
+
 #ifndef WITH_TSC
 
 #define READ_TIMESTAMP(var)
@@ -1094,6 +1096,8 @@ PyEval_EvalFrameEx(PyFrameObject *f, int
         }
 #endif
 
+	DTRACE_PROBE1 (python, backtrace, PyEval_GetFrame());
+	DTRACE_PROBE1 (python, get_variable, PyEval_GetFrame());
 
         /* Main switch on opcode */
         READ_TIMESTAMP(inst0);