perf script: Print comm, fork and exit events also
If --show-task-events option is given, also print internal COMM, FORK and EXIT events. It would be helpful for debugging. $ perf script --show-task-events ... swapper 0 [009] 3350640.335261: sched:sched_switch: prev_comm=swapper/9 sleep 9486 [009] 3350640.335509: PERF_RECORD_COMM: sleep:9486 sleep 9486 [009] 3350640.335806: sched:sched_stat_runtime: comm=sleep pid=9486 firefox 2635 [003] 3350641.275896: PERF_RECORD_FORK(2635:9487):(2635:2635) firefox 2635 [003] 3350641.275896: sched:sched_process_fork: comm=firefox pid=2635 sleep 9486 [009] 3350641.336009: PERF_RECORD_EXIT(9486:9486):(9486:9486) Signed-off-by: Namhyung Kim <namhyung@kernel.org> Suggested-by: Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1385455873-25865-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -203,6 +203,9 @@ OPTIONS
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--show-kernel-path::
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Try to resolve the path of [kernel.kallsyms]
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--show-task-events
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Display task related events (e.g. FORK, COMM, EXIT).
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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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@ -572,6 +572,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
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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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bool show_task_events;
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};
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static int process_attr(struct perf_tool *tool, union perf_event *event,
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@ -602,6 +603,101 @@ static int process_attr(struct perf_tool *tool, union perf_event *event,
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return perf_evsel__check_attr(evsel, scr->session);
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}
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static int process_comm_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine)
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{
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struct thread *thread;
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struct perf_script *script = container_of(tool, struct perf_script, tool);
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struct perf_session *session = script->session;
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struct perf_evsel *evsel = perf_evlist__first(session->evlist);
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int ret = -1;
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thread = machine__findnew_thread(machine, event->comm.pid, event->comm.tid);
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if (thread == NULL) {
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pr_debug("problem processing COMM event, skipping it.\n");
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return -1;
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}
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if (perf_event__process_comm(tool, event, sample, machine) < 0)
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goto out;
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if (!evsel->attr.sample_id_all) {
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sample->cpu = 0;
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sample->time = 0;
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sample->tid = event->comm.tid;
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sample->pid = event->comm.pid;
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}
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print_sample_start(sample, thread, evsel);
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perf_event__fprintf(event, stdout);
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ret = 0;
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out:
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return ret;
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}
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static int process_fork_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine)
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{
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struct thread *thread;
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struct perf_script *script = container_of(tool, struct perf_script, tool);
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struct perf_session *session = script->session;
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struct perf_evsel *evsel = perf_evlist__first(session->evlist);
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if (perf_event__process_fork(tool, event, sample, machine) < 0)
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return -1;
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thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid);
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if (thread == NULL) {
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pr_debug("problem processing FORK event, skipping it.\n");
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return -1;
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}
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if (!evsel->attr.sample_id_all) {
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sample->cpu = 0;
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sample->time = event->fork.time;
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sample->tid = event->fork.tid;
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sample->pid = event->fork.pid;
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}
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print_sample_start(sample, thread, evsel);
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perf_event__fprintf(event, stdout);
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return 0;
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}
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static int process_exit_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine)
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{
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struct thread *thread;
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struct perf_script *script = container_of(tool, struct perf_script, tool);
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struct perf_session *session = script->session;
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struct perf_evsel *evsel = perf_evlist__first(session->evlist);
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thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid);
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if (thread == NULL) {
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pr_debug("problem processing EXIT event, skipping it.\n");
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return -1;
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}
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if (!evsel->attr.sample_id_all) {
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sample->cpu = 0;
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sample->time = 0;
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sample->tid = event->comm.tid;
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sample->pid = event->comm.pid;
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}
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print_sample_start(sample, thread, evsel);
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perf_event__fprintf(event, stdout);
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if (perf_event__process_exit(tool, event, sample, machine) < 0)
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return -1;
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return 0;
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}
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static void sig_handler(int sig __maybe_unused)
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{
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session_done = 1;
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@ -613,6 +709,13 @@ static int __cmd_script(struct perf_script *script)
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signal(SIGINT, sig_handler);
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/* override event processing functions */
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if (script->show_task_events) {
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script->tool.comm = process_comm_event;
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script->tool.fork = process_fork_event;
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script->tool.exit = process_exit_event;
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}
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ret = perf_session__process_events(script->session, &script->tool);
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if (debug_mode)
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@ -1375,6 +1478,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
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"display extended information from perf.data file"),
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OPT_BOOLEAN('\0', "show-kernel-path", &symbol_conf.show_kernel_path,
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"Show the path of [kernel.kallsyms]"),
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OPT_BOOLEAN('\0', "show-task-events", &script.show_task_events,
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"Show the fork/comm/exit events"),
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OPT_END()
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};
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const char * const script_usage[] = {
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