diff -up Python-2.7rc1/configure.ac.systemtap Python-2.7rc1/configure.ac
--- Python-2.7rc1/configure.ac.systemtap	2010-06-06 10:53:15.514975012 -0400
+++ Python-2.7rc1/configure.ac	2010-06-06 10:53:15.520974361 -0400
@@ -2616,6 +2616,38 @@ if test "$with_valgrind" != no; then
     )
 fi
 
+# Check for dtrace support
+AC_MSG_CHECKING(for --with-dtrace)
+AC_ARG_WITH(dtrace,
+            AC_HELP_STRING(--with(out)-dtrace, disable/enable dtrace support))
+
+if test ! -z "$with_dtrace"
+then
+    if dtrace -G -o /dev/null -s $srcdir/Include/pydtrace.d 2>/dev/null
+    then
+	AC_DEFINE(WITH_DTRACE, 1, 
+	 [Define if you want to compile in Dtrace support])
+	with_dtrace="Sun"
+	DTRACEOBJS="Python/dtrace.o"
+	DTRADEHDRS=""
+    elif dtrace -h -o /dev/null -s $srcdir/Include/pydtrace.d
+    then
+	AC_DEFINE(WITH_DTRACE, 1, 
+	 [Define if you want to compile in Dtrace support])
+	with_dtrace="Apple"
+	DTRACEOBJS=""
+	DTRADEHDRS="pydtrace.h"
+    else
+	with_dtrace="no"
+    fi
+else
+    with_dtrace="no"
+fi
+
+AC_MSG_RESULT($with_dtrace)
+AC_SUBST(DTRACEOBJS)
+AC_SUBST(DTRACEHDRS)
+
 # Check for --with-wctype-functions
 AC_MSG_CHECKING(for --with-wctype-functions)
 AC_ARG_WITH(wctype-functions, 
diff -up Python-2.7rc1/Include/pydtrace.d.systemtap Python-2.7rc1/Include/pydtrace.d
--- Python-2.7rc1/Include/pydtrace.d.systemtap	2010-06-06 10:53:15.520974361 -0400
+++ Python-2.7rc1/Include/pydtrace.d	2010-06-06 10:53:15.520974361 -0400
@@ -0,0 +1,10 @@
+provider python {
+	probe function__entry(const char *, const char *, int);
+	probe function__return(const char *, const char *, int);
+};
+
+#pragma D attributes Evolving/Evolving/Common provider python provider
+#pragma D attributes Private/Private/Common provider python module
+#pragma D attributes Private/Private/Common provider python function
+#pragma D attributes Evolving/Evolving/Common provider python name
+#pragma D attributes Evolving/Evolving/Common provider python args
diff -up Python-2.7rc1/Makefile.pre.in.systemtap Python-2.7rc1/Makefile.pre.in
--- Python-2.7rc1/Makefile.pre.in.systemtap	2010-06-06 10:53:15.488978775 -0400
+++ Python-2.7rc1/Makefile.pre.in	2010-06-06 11:05:30.411100568 -0400
@@ -298,6 +298,7 @@ PYTHON_OBJS=	\
 		Python/formatter_unicode.o \
 		Python/formatter_string.o \
 		Python/$(DYNLOADFILE) \
+		@DTRACEOBJS@ \
 		$(LIBOBJS) \
 		$(MACHDEP_OBJS) \
 		$(THREADOBJ)
@@ -599,6 +600,18 @@ Python/formatter_unicode.o: $(srcdir)/Py
 Python/formatter_string.o: $(srcdir)/Python/formatter_string.c \
 				$(STRINGLIB_HEADERS)
 
+# Only needed with --with-dtrace
+buildinclude:
+	mkdir -p Include
+
+Include/pydtrace.h: buildinclude $(srcdir)/Include/pydtrace.d
+	dtrace -o $@ $(DFLAGS) -C -h -s $(srcdir)/Include/pydtrace.d
+
+Python/ceval.o: Include/pydtrace.h
+
+Python/dtrace.o: buildinclude $(srcdir)/Include/pydtrace.d Python/ceval.o
+	dtrace -o $@ $(DFLAGS) -C -G -s $(srcdir)/Include/pydtrace.d Python/ceval.o
+
 ############################################################################
 # Header files
 
@@ -1251,7 +1264,7 @@ Python/thread.o: @THREADHEADERS@
 .PHONY: frameworkinstall frameworkinstallframework frameworkinstallstructure
 .PHONY: frameworkinstallmaclib frameworkinstallapps frameworkinstallunixtools
 .PHONY: frameworkaltinstallunixtools recheck clean clobber distclean
-.PHONY: smelly funny patchcheck altmaninstall commoninstall
+.PHONY: smelly funny patchcheck altmaninstall commoninstall buildinclude
 .PHONY: gdbhooks
 
 # IF YOU PUT ANYTHING HERE IT WILL GO AWAY
diff -up Python-2.7rc1/pyconfig.h.in.systemtap Python-2.7rc1/pyconfig.h.in
--- Python-2.7rc1/pyconfig.h.in.systemtap	2010-05-08 07:04:18.000000000 -0400
+++ Python-2.7rc1/pyconfig.h.in	2010-06-06 10:53:15.521974070 -0400
@@ -1074,6 +1074,9 @@
 /* Define if you want documentation strings in extension modules */
 #undef WITH_DOC_STRINGS
 
+/* Define if you want to compile in Dtrace support */
+#undef WITH_DTRACE
+
 /* Define if you want to use the new-style (Openstep, Rhapsody, MacOS) dynamic
    linker (dyld) instead of the old-style (NextStep) dynamic linker (rld).
    Dyld is necessary to support frameworks. */
diff -up Python-2.7rc1/Python/ceval.c.systemtap Python-2.7rc1/Python/ceval.c
--- Python-2.7rc1/Python/ceval.c.systemtap	2010-05-09 10:46:46.000000000 -0400
+++ Python-2.7rc1/Python/ceval.c	2010-06-06 11:08:40.683100500 -0400
@@ -19,6 +19,10 @@
 
 #include <ctype.h>
 
+#ifdef WITH_DTRACE
+#include "pydtrace.h"
+#endif
+
 #ifndef WITH_TSC
 
 #define READ_TIMESTAMP(var)
@@ -671,6 +675,55 @@ PyEval_EvalCode(PyCodeObject *co, PyObje
                       NULL);
 }
 
+#ifdef WITH_DTRACE
+static void
+dtrace_entry(PyFrameObject *f)
+{
+    const char *filename;
+    const char *fname;
+    int lineno;
+
+    filename = PyString_AsString(f->f_code->co_filename);
+    fname = PyString_AsString(f->f_code->co_name);
+    lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
+
+    PYTHON_FUNCTION_ENTRY((char *)filename, (char *)fname, lineno);
+
+    /*
+     * Currently a USDT tail-call will not receive the correct arguments.
+     * Disable the tail call here.
+     */
+#if defined(__sparc)
+    asm("nop");
+#endif
+}
+
+static void
+dtrace_return(PyFrameObject *f)
+{
+    const char *filename;
+    const char *fname;
+    int lineno;
+
+    filename = PyString_AsString(f->f_code->co_filename);
+    fname = PyString_AsString(f->f_code->co_name);
+    lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
+    PYTHON_FUNCTION_RETURN((char *)filename, (char *)fname, lineno);
+
+    /*
+     * Currently a USDT tail-call will not receive the correct arguments.
+     * Disable the tail call here.
+     */
+#if defined(__sparc)
+    asm("nop");
+#endif
+}
+#else
+#define	PYTHON_FUNCTION_ENTRY_ENABLED() 0
+#define	PYTHON_FUNCTION_RETURN_ENABLED() 0
+#define	dtrace_entry(f)
+#define	dtrace_return(f)
+#endif
 
 /* Interpreter main loop */
 
@@ -909,6 +962,9 @@ PyEval_EvalFrameEx(PyFrameObject *f, int
         }
     }
 
+    if (PYTHON_FUNCTION_ENTRY_ENABLED())
+        dtrace_entry(f);
+
     co = f->f_code;
     names = co->co_names;
     consts = co->co_consts;
@@ -3000,6 +3056,9 @@ fast_yield:
 
     /* pop frame */
 exit_eval_frame:
+    if (PYTHON_FUNCTION_RETURN_ENABLED())
+        dtrace_return(f);
+
     Py_LeaveRecursiveCall();
     tstate->frame = f->f_back;
 
