mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 05:40:53 +07:00
9881d7df9d
To show how to enable a tracepoint and access its fields. Committer note: Testing it: # ls -l /tmp/build/perf/python/perf.so -rwxrwxr-x. 1 acme acme 1563256 Jul 12 16:19 /tmp/build/perf/python/perf.so # export PYTHONPATH=/tmp/build/perf/python/ # tools/perf/python/tracepoint.py 2> /dev/null | head -200 | tail -10 time 76345337296548 prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=tracepoint.py- next_pid=18479 next_prio=120 time 76345338520479 prev_comm=gnome-shelln-b prev_pid=2186 prev_prio=120 prev_state=0x1 ==> next_comm=swapper/1 next_pid=0 next_prio=120 time 76345337309942 prev_comm=tracepoint.py- prev_pid=18479 prev_prio=120 prev_state=0x1 ==> next_comm=swapper/0 next_pid=0 next_prio=120 time 76345337312302 prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=tracepoint.py- next_pid=18479 next_prio=120 time 76345337324927 prev_comm=tracepoint.py- prev_pid=18479 prev_prio=120 prev_state=0x1 ==> next_comm=swapper/0 next_pid=0 next_prio=120 time 76345337327115 prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=tracepoint.py- next_pid=18479 next_prio=120 time 76345338621750 prev_comm=swapper/2 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=rcuos/2 next_pid=29 next_prio=120 time 76345338607922 prev_comm=swapper/3 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=rcu_sched next_pid=7 next_prio=120 time 76345337338817 prev_comm=tracepoint.py- prev_pid=18479 prev_prio=120 prev_state=0x1 ==> next_comm=swapper/0 next_pid=0 next_prio=120 time 76345338627156 prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=0x0 ==> next_comm=head-terminal- next_pid=18480 next_prio=120 # # strip /tmp/build/perf/python/perf.so # ls -l /tmp/build/perf/python/perf.so -rwxrwxr-x. 1 acme acme 319616 Jul 12 16:25 /tmp/build/perf/python/perf.so Reported-and-Tested-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1468148882-10362-10-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
48 lines
1.4 KiB
Python
Executable File
48 lines
1.4 KiB
Python
Executable File
#! /usr/bin/python
|
|
# -*- python -*-
|
|
# -*- coding: utf-8 -*-
|
|
|
|
import perf
|
|
|
|
class tracepoint(perf.evsel):
|
|
def __init__(self, sys, name):
|
|
config = perf.tracepoint(sys, name)
|
|
perf.evsel.__init__(self,
|
|
type = perf.TYPE_TRACEPOINT,
|
|
config = config,
|
|
freq = 0, sample_period = 1, wakeup_events = 1,
|
|
sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
|
|
|
|
def main():
|
|
tp = tracepoint("sched", "sched_switch")
|
|
cpus = perf.cpu_map()
|
|
threads = perf.thread_map(-1)
|
|
|
|
evlist = perf.evlist(cpus, threads)
|
|
evlist.add(tp)
|
|
evlist.open()
|
|
evlist.mmap()
|
|
|
|
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()
|