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