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diff --git a/kernel/tools/perf/python/twatch.py b/kernel/tools/perf/python/twatch.py
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+#! /usr/bin/python
+# -*- python -*-
+# -*- coding: utf-8 -*-
+# twatch - Experimental use of the perf python interface
+# Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
+#
+# This application is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; version 2.
+#
+# This application is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+
+import perf
+
+def main():
+ cpus = perf.cpu_map()
+ threads = perf.thread_map()
+ evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
+ wakeup_events = 1, watermark = 1,
+ sample_id_all = 1,
+ sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)
+ evsel.open(cpus = cpus, threads = threads);
+ evlist = perf.evlist(cpus, threads)
+ evlist.add(evsel)
+ evlist.mmap()
+ while True:
+ evlist.poll(timeout = -1)
+ for cpu in cpus:
+ event = evlist.read_on_cpu(cpu)
+ if not event:
+ continue
+ print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
+ event.sample_pid,
+ event.sample_tid),
+ print event
+
+if __name__ == '__main__':
+ main()