perf script: Allow specifying event to switch on processing of other events
Sometime we want to only consider events after something happens, so allow discarding events till such events is found, e.g.: Record all scheduler tracepoints and the sys_enter_nanosleep syscall event for the 'sleep 1' workload: # perf record -e sched:*,syscalls:sys_enter_nanosleep sleep 1 [ perf record: Woken up 31 times to write data ] [ perf record: Captured and wrote 0.032 MB perf.data (10 samples) ] # So we have these events in the generated perf data file: # perf evlist sched:sched_kthread_stop sched:sched_kthread_stop_ret sched:sched_waking sched:sched_wakeup sched:sched_wakeup_new sched:sched_switch sched:sched_migrate_task sched:sched_process_free sched:sched_process_exit sched:sched_wait_task sched:sched_process_wait sched:sched_process_fork sched:sched_process_exec sched:sched_stat_wait sched:sched_stat_sleep sched:sched_stat_iowait sched:sched_stat_blocked sched:sched_stat_runtime sched:sched_pi_setprio sched:sched_move_numa sched:sched_stick_numa sched:sched_swap_numa sched:sched_wake_idle_without_ipi syscalls:sys_enter_nanosleep # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events # Then show all of the events that actually took place in this 'perf record' session: # perf script :13637 13637 [002] 108237.581529: sched:sched_waking: comm=perf pid=13638 prio=120 target_cpu=001 :13637 13637 [002] 108237.581537: sched:sched_wakeup: perf:13638 [120] success=1 CPU:001 sleep 13638 [001] 108237.581992: sched:sched_process_exec: filename=/usr/bin/sleep pid=13638 old_pid=13638 sleep 13638 [001] 108237.582286: syscalls:sys_enter_nanosleep: rqtp: 0x7fff1948ac40, rmtp: 0x00000000 sleep 13638 [001] 108237.582289: sched:sched_stat_runtime: comm=sleep pid=13638 runtime=578104 [ns] vruntime=202889459556 [ns] sleep 13638 [001] 108237.582291: sched:sched_switch: sleep:13638 [120] S ==> swapper/1:0 [120] swapper 0 [001] 108238.582428: sched:sched_waking: comm=sleep pid=13638 prio=120 target_cpu=001 swapper 0 [001] 108238.582458: sched:sched_wakeup: sleep:13638 [120] success=1 CPU:001 sleep 13638 [001] 108238.582698: sched:sched_stat_runtime: comm=sleep pid=13638 runtime=173915 [ns] vruntime=202889633471 [ns] sleep 13638 [001] 108238.582782: sched:sched_process_exit: comm=sleep pid=13638 prio=120 # Now lets see only the ones that took place after a certain "marker": # perf script --switch-on syscalls:sys_enter_nanosleep sleep 13638 [001] 108237.582289: sched:sched_stat_runtime: comm=sleep pid=13638 runtime=578104 [ns] vruntime=202889459556 [ns] sleep 13638 [001] 108237.582291: sched:sched_switch: sleep:13638 [120] S ==> swapper/1:0 [120] swapper 0 [001] 108238.582428: sched:sched_waking: comm=sleep pid=13638 prio=120 target_cpu=001 swapper 0 [001] 108238.582458: sched:sched_wakeup: sleep:13638 [120] success=1 CPU:001 sleep 13638 [001] 108238.582698: sched:sched_stat_runtime: comm=sleep pid=13638 runtime=173915 [ns] vruntime=202889633471 [ns] sleep 13638 [001] 108238.582782: sched:sched_process_exit: comm=sleep pid=13638 prio=120 # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Florian Weimer <fweimer@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: William Cohen <wcohen@redhat.com> Link: https://lkml.kernel.org/n/tip-f1oo0ufdhrkx6nhy2lj1ierm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -417,6 +417,9 @@ include::itrace.txt[]
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For itrace only show specified functions and their callees for
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itrace. Multiple functions can be separated by comma.
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--switch-on EVENT_NAME::
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Only consider events after this event is found.
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-script-perl[1],
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@ -1616,6 +1616,11 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample,
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return 0;
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}
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struct evswitch {
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struct evsel *on;
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bool discarding;
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};
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struct perf_script {
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struct perf_tool tool;
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struct perf_session *session;
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@ -1628,6 +1633,7 @@ struct perf_script {
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bool show_bpf_events;
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bool allocated;
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bool per_event_dump;
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struct evswitch evswitch;
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struct perf_cpu_map *cpus;
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struct perf_thread_map *threads;
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int name_width;
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@ -1805,6 +1811,13 @@ static void process_event(struct perf_script *script,
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if (!show_event(sample, evsel, thread, al))
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return;
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if (script->evswitch.on && script->evswitch.discarding) {
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if (script->evswitch.on != evsel)
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return;
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script->evswitch.discarding = false;
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}
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++es->samples;
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perf_sample__fprintf_start(sample, thread, evsel,
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@ -3395,6 +3408,7 @@ int cmd_script(int argc, const char **argv)
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struct utsname uts;
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char *script_path = NULL;
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const char **__argv;
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const char *event_switch_on = NULL;
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int i, j, err = 0;
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struct perf_script script = {
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.tool = {
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@ -3538,6 +3552,8 @@ int cmd_script(int argc, const char **argv)
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"file", "file saving guest os /proc/kallsyms"),
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OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
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"file", "file saving guest os /proc/modules"),
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OPT_STRING(0, "switch-on", &event_switch_on,
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"event", "Consider events from the first ocurrence of this event"),
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OPT_END()
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};
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const char * const script_subcommands[] = { "record", "report", NULL };
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@ -3862,6 +3878,16 @@ int cmd_script(int argc, const char **argv)
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script.range_num);
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}
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if (event_switch_on) {
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script.evswitch.on = perf_evlist__find_evsel_by_str(session->evlist, event_switch_on);
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if (script.evswitch.on == NULL) {
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fprintf(stderr, "switch-on event not found (%s)\n", event_switch_on);
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err = -ENOENT;
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goto out_delete;
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}
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script.evswitch.discarding = true;
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}
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err = __cmd_script(&script);
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flush_scripting();
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