1 #! /usr/bin/env python
2 # SPDX-License-Identifier: GPL-2.0-only
3 # -*- python -*-
4 # -*- coding: utf-8 -*-
5 # twatch - Experimental use of the perf pyth
6 # Copyright (C) 2011 Arnaldo Carvalho de Mel<
7 #
8
9 import perf
10
11 def main(context_switch = 0, thread = -1):
12 cpus = perf.cpu_map()
13 threads = perf.thread_map(thread)
14 evsel = perf.evsel(type = perf.TYPE_
15 config = perf.COUNT
16 task = 1, comm = 1,
17 wakeup_events = 1,
18 sample_id_all = 1,
19 sample_type = perf.
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
29 evlist = perf.evlist(cpus, threads)
30 evlist.add(evsel)
31 evlist.mmap()
32 while True:
33 evlist.poll(timeout = -1)
34 for cpu in cpus:
35 event = evlist.read_on
36 if not event:
37 continue
38 print("cpu: {0}, pid:
39
40
41
42
43 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()
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