Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#! /usr/bin/env python
2# SPDX-License-Identifier: GPL-2.0
3# -*- python -*-
4# -*- coding: utf-8 -*-
5
6import perf
7
8def change_proctitle():
9 try:
10 import setproctitle
11 setproctitle.setproctitle("tracepoint.py")
12 except:
13 print("Install the setproctitle python package to help with top and friends")
14
15def main():
16 change_proctitle()
17 cpus = perf.cpu_map()
18 threads = perf.thread_map(-1)
19 evlist = perf.parse_events("sched:sched_switch", cpus, threads)
20 # Disable tracking of mmaps and similar that are unnecessary.
21 for ev in evlist:
22 ev.tracking = False
23 # Configure evsels with default record options.
24 evlist.config()
25 # Simplify the sample_type and read_format of evsels
26 for ev in evlist:
27 ev.sample_type = ev.sample_type & ~perf.SAMPLE_IP
28 ev.read_format = 0
29
30 evlist.open()
31 evlist.mmap()
32 evlist.enable();
33
34 while True:
35 evlist.poll(timeout = -1)
36 for cpu in cpus:
37 event = evlist.read_on_cpu(cpu)
38 if not event:
39 continue
40
41 if not isinstance(event, perf.sample_event):
42 continue
43
44 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" % (
45 event.sample_time,
46 event.prev_comm,
47 event.prev_pid,
48 event.prev_prio,
49 event.prev_state,
50 event.next_comm,
51 event.next_pid,
52 event.next_prio))
53
54if __name__ == '__main__':
55 main()