linux-kernel - [PATCH 06/10] perf python: Add perf.tracepoint method

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Date:	Sun, 10 Jul 2016 13:07:58 +0200
From:	Jiri Olsa <jolsa@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 06/10] perf python: Add perf.tracepoint method

To get id of the tracepoint from subsystem and
name strings. The interface is:

  id = perf.tracepoint(sys, name)

In case of error -1 is returned.

It will be used to get python tracepoint event's
config value for tracepoint event.

Link: http://lkml.kernel.org/n/tip-ssizvbkk2lds6bti2z69tikh@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/python.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index fc277e486d17..45fdd4a68721 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -2,6 +2,7 @@
 #include <structmember.h>
 #include <inttypes.h>
 #include <poll.h>
+#include <linux/err.h>
 #include "evlist.h"
 #include "evsel.h"
 #include "event.h"
@@ -1076,7 +1077,32 @@ static struct {
 	{ .name = NULL, },
 };
 
+static PyObject *pyrf__tracepoint(struct pyrf_evsel *pevsel,
+				  PyObject *args, PyObject *kwargs)
+{
+	struct event_format *tp_format;
+	static char *kwlist[] = { "sys", "name", NULL };
+	char *sys  = NULL;
+	char *name = NULL;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ss", kwlist,
+					 &sys, &name))
+		return NULL;
+
+	tp_format = trace_event__tp_format(sys, name);
+	if (IS_ERR(tp_format))
+		return PyInt_FromLong(-1);
+
+	return PyInt_FromLong(tp_format->id);
+}
+
 static PyMethodDef perf__methods[] = {
+	{
+		.ml_name  = "tracepoint",
+		.ml_meth  = (PyCFunction) pyrf__tracepoint,
+		.ml_flags = METH_VARARGS | METH_KEYWORDS,
+		.ml_doc	  = PyDoc_STR("Get tracepoint config.")
+	},
 	{ .ml_name = NULL, }
 };
 
-- 
2.4.11