1 #! /usr/bin/env python !! 1 #! /usr/bin/python
2 # SPDX-License-Identifier: GPL-2.0-only <<
3 # -*- python -*- 2 # -*- python -*-
4 # -*- coding: utf-8 -*- 3 # -*- coding: utf-8 -*-
5 # twatch - Experimental use of the perf pyth 4 # twatch - Experimental use of the perf python interface
6 # Copyright (C) 2011 Arnaldo Carvalho de Mel< 5 # Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
7 # 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.
8 15
9 import perf 16 import perf
10 17
11 def main(context_switch = 0, thread = -1): !! 18 def main():
12 cpus = perf.cpu_map() 19 cpus = perf.cpu_map()
13 threads = perf.thread_map(thread) !! 20 threads = perf.thread_map()
14 evsel = perf.evsel(type = perf.TYPE_ !! 21 evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
15 config = perf.COUNT <<
16 task = 1, comm = 1, <<
17 wakeup_events = 1, 22 wakeup_events = 1, watermark = 1,
18 sample_id_all = 1, !! 23 sample_id_all = 1,
19 sample_type = perf. !! 24 sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
20 <<
21 """What we want are just the PERF_RECO <<
22 using the default, PERF_TYPE_HARDWARE <<
23 (the default), makes perf reenable ir <<
24 disabling nohz, not good for some use <<
25 threads comes and goes... So use (per <<
26 freq=0) instead.""" <<
27 <<
28 evsel.open(cpus = cpus, threads = thre 25 evsel.open(cpus = cpus, threads = threads);
29 evlist = perf.evlist(cpus, threads) 26 evlist = perf.evlist(cpus, threads)
30 evlist.add(evsel) 27 evlist.add(evsel)
31 evlist.mmap() 28 evlist.mmap()
32 while True: 29 while True:
33 evlist.poll(timeout = -1) 30 evlist.poll(timeout = -1)
34 for cpu in cpus: 31 for cpu in cpus:
35 event = evlist.read_on 32 event = evlist.read_on_cpu(cpu)
36 if not event: 33 if not event:
37 continue 34 continue
38 print("cpu: {0}, pid: !! 35 print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
39 !! 36 event.sample_pid,
40 !! 37 event.sample_tid),
41 !! 38 print event
42 39
43 if __name__ == '__main__': 40 if __name__ == '__main__':
44 """ <<
45 To test the PERF_RECORD_SWITCH record, <<
46 in the following line. <<
47 <<
48 Example output: <<
49 <<
50 cpu: 3, pid: 31463, tid: 31593 { type: context <<
51 cpu: 1, pid: 31463, tid: 31489 { type: context <<
52 cpu: 2, pid: 31463, tid: 31496 { type: context <<
53 cpu: 3, pid: 31463, tid: 31491 { type: context <<
54 <<
55 It is possible as well to use event.mi <<
56 to figure out if this is a context swi <<
57 <<
58 If bored, please add command line opti <<
59 """ <<
60 # main(context_switch = 1, thread = 31463) <<
61 main() 41 main()
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