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Date: Sun, 10 Jul 2016 13:08:01 +0200 From: Jiri Olsa <jolsa@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: lkml <linux-kernel@...r.kernel.org>, David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: [PATCH 09/10] perf python: Add tracepoint example To show how to open tracepoint and access its fields. Reported-and-tested-by: Jiri Pirko <jiri@...lanox.com> Link: http://lkml.kernel.org/n/tip-7xt9nvyl45qwbg9237f46194@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@...nel.org> --- tools/perf/python/tracepoint.py | 47 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100755 tools/perf/python/tracepoint.py diff --git a/tools/perf/python/tracepoint.py b/tools/perf/python/tracepoint.py new file mode 100755 index 000000000000..eb4dbed57de7 --- /dev/null +++ b/tools/perf/python/tracepoint.py @@ -0,0 +1,47 @@ +#! /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() -- 2.4.11
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