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#! /usr/bin/env python
# SPDX-License-Identifier: GPL-2.0
# -*- python -*-
# -*- coding: utf-8 -*-
import perf
def change_proctitle():
try:
import setproctitle
setproctitle.setproctitle("tracepoint.py")
except:
print("Install the setproctitle python package to help with top and friends")
def main():
change_proctitle()
cpus = perf.cpu_map()
threads = perf.thread_map(-1)
evlist = perf.parse_events("sched:sched_switch", cpus, threads)
# Disable tracking of mmaps and similar that are unnecessary.
for ev in evlist:
ev.tracking = False
# Configure evsels with default record options.
evlist.config()
# Simplify the sample_type and read_format of evsels
for ev in evlist:
ev.sample_type = ev.sample_type & ~perf.SAMPLE_IP
ev.read_format = 0
evlist.open()
evlist.mmap()
evlist.enable();
while True:
evlist.poll(timeout = -1)
for cpu in cpus:
event = evlist.read_on_cpu(cpu)
if not event:
continue
if not isinstance(event, perf.sample_event):
continue
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" % (
event.sample_time,
event.prev_comm,
event.prev_pid,
event.prev_prio,
event.prev_state,
event.next_comm,
event.next_pid,
event.next_prio))
if __name__ == '__main__':
main()
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