1 #! /usr/bin/env python
2 # SPDX-License-Identifier: GPL-2.0
3 # -*- python -*-
4 # -*- coding: utf-8 -*-
5
6 import perf
7
8 class tracepoint(perf.evsel):
9 def __init__(self, sys, name):
10 config = perf.tracepoint(sys, name)
11 perf.evsel.__init__(self,
12 type = perf.TYPE_TRACEPOINT,
13 config = config,
14 freq = 0, sample_period = 1, wakeup_events = 1,
15 sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
16
17 def main():
18 tp = tracepoint("sched", "sched_switch")
19 cpus = perf.cpu_map()
20 threads = perf.thread_map(-1)
21
22 evlist = perf.evlist(cpus, threads)
23 evlist.add(tp)
24 evlist.open()
25 evlist.mmap()
26
27 while True:
28 evlist.poll(timeout = -1)
29 for cpu in cpus:
30 event = evlist.read_on_cpu(cpu)
31 if not event:
32 continue
33
34 if not isinstance(event, perf.sample_event):
35 continue
36
37 print("time %u prev_comm=%s prev_pid=%d prev_prio=%d prev_state=0x%x ==> next_comm=%s next_pid=%d next_prio=%d" % (
38 event.sample_time,
39 event.prev_comm,
40 event.prev_pid,
41 event.prev_prio,
42 event.prev_state,
43 event.next_comm,
44 event.next_pid,
45 event.next_prio))
46
47 if __name__ == '__main__':
48 main()
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