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twatch.py
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1 #! /usr/bin/python
2 # -*- python -*-
3 # -*- coding: utf-8 -*-
4 # twatch - Experimental use of the perf python interface
5 # Copyright (C) 2011 Arnaldo Carvalho de Melo <[email protected]>
6 #
7 # This application is free software; you can redistribute it and/or
8 # modify it under the terms of the GNU General Public License
9 # as published by the Free Software Foundation; version 2.
10 #
11 # This application is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
15 
16 import perf
17 
18 def main():
19  cpus = perf.cpu_map()
20  threads = perf.thread_map()
21  evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
22  wakeup_events = 1, watermark = 1,
23  sample_id_all = 1,
24  sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
25  evsel.open(cpus = cpus, threads = threads);
26  evlist = perf.evlist(cpus, threads)
27  evlist.add(evsel)
28  evlist.mmap()
29  while True:
30  evlist.poll(timeout = -1)
31  for cpu in cpus:
32  event = evlist.read_on_cpu(cpu)
33  if not event:
34  continue
35  print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
36  event.sample_pid,
37  event.sample_tid),
38  print event
39 
40 if __name__ == '__main__':
41  main()