Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ad7ebb9a authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarNamhyung Kim <namhyung@kernel.org>
Suggested-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: default avatarDavid 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 80b8b496

tools/perf/Documentation/perf-script.txt

+3 −0
Original line number Diff line number Diff line
@@ -203,6 +203,9 @@ OPTIONS 
--show-kernel-path::

	Try to resolve the path of [kernel.kallsyms]



--show-task-events

	Display task related events (e.g. FORK, COMM, EXIT).



SEE ALSO

--------

linkperf:perf-record[1], linkperf:perf-script-perl[1],

tools/perf/builtin-script.c

+105 −0
Original line number Diff line number Diff line
@@ -572,6 +572,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused, 
struct perf_script {

	struct perf_tool	tool;

	struct perf_session	*session;

	bool			show_task_events;

};



static int process_attr(struct perf_tool *tool, union perf_event *event,
@@ -602,6 +603,101 @@ static int process_attr(struct perf_tool *tool, union perf_event *event, 
	return perf_evsel__check_attr(evsel, scr->session);

}



static int process_comm_event(struct perf_tool *tool,

			      union perf_event *event,

			      struct perf_sample *sample,

			      struct machine *machine)

{

	struct thread *thread;

	struct perf_script *script = container_of(tool, struct perf_script, tool);

	struct perf_session *session = script->session;

	struct perf_evsel *evsel = perf_evlist__first(session->evlist);

	int ret = -1;



	thread = machine__findnew_thread(machine, event->comm.pid, event->comm.tid);

	if (thread == NULL) {

		pr_debug("problem processing COMM event, skipping it.\n");

		return -1;

	}



	if (perf_event__process_comm(tool, event, sample, machine) < 0)

		goto out;



	if (!evsel->attr.sample_id_all) {

		sample->cpu = 0;

		sample->time = 0;

		sample->tid = event->comm.tid;

		sample->pid = event->comm.pid;

	}

	print_sample_start(sample, thread, evsel);

	perf_event__fprintf(event, stdout);

	ret = 0;



out:

	return ret;

}



static int process_fork_event(struct perf_tool *tool,

			      union perf_event *event,

			      struct perf_sample *sample,

			      struct machine *machine)

{

	struct thread *thread;

	struct perf_script *script = container_of(tool, struct perf_script, tool);

	struct perf_session *session = script->session;

	struct perf_evsel *evsel = perf_evlist__first(session->evlist);



	if (perf_event__process_fork(tool, event, sample, machine) < 0)

		return -1;



	thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid);

	if (thread == NULL) {

		pr_debug("problem processing FORK event, skipping it.\n");

		return -1;

	}



	if (!evsel->attr.sample_id_all) {

		sample->cpu = 0;

		sample->time = event->fork.time;

		sample->tid = event->fork.tid;

		sample->pid = event->fork.pid;

	}

	print_sample_start(sample, thread, evsel);

	perf_event__fprintf(event, stdout);



	return 0;

}

static int process_exit_event(struct perf_tool *tool,

			      union perf_event *event,

			      struct perf_sample *sample,

			      struct machine *machine)

{

	struct thread *thread;

	struct perf_script *script = container_of(tool, struct perf_script, tool);

	struct perf_session *session = script->session;

	struct perf_evsel *evsel = perf_evlist__first(session->evlist);



	thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid);

	if (thread == NULL) {

		pr_debug("problem processing EXIT event, skipping it.\n");

		return -1;

	}



	if (!evsel->attr.sample_id_all) {

		sample->cpu = 0;

		sample->time = 0;

		sample->tid = event->comm.tid;

		sample->pid = event->comm.pid;

	}

	print_sample_start(sample, thread, evsel);

	perf_event__fprintf(event, stdout);



	if (perf_event__process_exit(tool, event, sample, machine) < 0)

		return -1;



	return 0;

}



static void sig_handler(int sig __maybe_unused)

{

	session_done = 1;
@@ -613,6 +709,13 @@ static int __cmd_script(struct perf_script *script) 


	signal(SIGINT, sig_handler);



	/* override event processing functions */

	if (script->show_task_events) {

		script->tool.comm = process_comm_event;

		script->tool.fork = process_fork_event;

		script->tool.exit = process_exit_event;

	}



	ret = perf_session__process_events(script->session, &script->tool);



	if (debug_mode)
@@ -1375,6 +1478,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused) 
		    "display extended information from perf.data file"),

	OPT_BOOLEAN('\0', "show-kernel-path", &symbol_conf.show_kernel_path,

		    "Show the path of [kernel.kallsyms]"),

	OPT_BOOLEAN('\0', "show-task-events", &script.show_task_events,

		    "Show the fork/comm/exit events"),

	OPT_END()

	};

	const char * const script_usage[] = {