1#! /usr/bin/env python
 2# SPDX-License-Identifier: GPL-2.0
 3# -*- python -*-
 4# -*- coding: utf-8 -*-
 5
 6import perf
 7
 8class 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
17def 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
47if __name__ == '__main__':
48    main()

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