Commit 99a3c3a9 authored by Changbin Du's avatar Changbin Du Committed by Arnaldo Carvalho de Melo
Browse files

perf sched map: Re-annotate shortname if thread comm changed 



This is to show the real name of thread that created via fork-exec.  See
below example for shortname *A0*.

$ sudo ./perf sched map
              *A0   80393.050639 secs A0 => perf:22368
          *.   A0   80393.050748 secs .  => swapper:0
           .  *.    80393.050887 secs
      *B0  .   .    80393.052735 secs B0 => rcu_sched:8
      *.   .   .    80393.052743 secs
       .  *C0  .    80393.056264 secs C0 => kworker/2:1H:287
       .  *A0  .    80393.056270 secs
       .  *D0  .    80393.056769 secs D0 => ksoftirqd/2:22
-      .  *A0  .    80393.056804 secs
+      .  *A0  .    80393.056804 secs A0 => pi:22368
       .  *.   .    80393.056854 secs
      *B0  .   .    80393.060727 secs
      ...

Signed-off-by: default avatarChangbin Du <changbin.du@intel.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1520307457-23668-3-git-send-email-changbin.du@intel.com


[ Optimally pack struct thread_runtime when adding the new bool member ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 8640da9f

tools/perf/builtin-sched.c

+36 −2
Original line number Diff line number Diff line
@@ -256,6 +256,8 @@ struct thread_runtime { 
	int last_state;



	char shortname[3];

	bool comm_changed;



	u64 migrations;

};
@@ -1626,7 +1628,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel, 


	timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));

	color_fprintf(stdout, color, "  %12s secs ", stimestamp);

	if (new_shortname || (verbose > 0 && sched_in->tid)) {

	if (new_shortname || tr->comm_changed || (verbose > 0 && sched_in->tid)) {

		const char *pid_color = color;



		if (thread__has_color(sched_in))
@@ -1634,6 +1636,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel, 


		color_fprintf(stdout, pid_color, "%s => %s:%d",

		       tr->shortname, thread__comm_str(sched_in), sched_in->tid);

		tr->comm_changed = false;

	}



	if (sched->map.comp && new_cpu)
@@ -1737,6 +1740,37 @@ static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __maybe_ 
	return err;

}



static int perf_sched__process_comm(struct perf_tool *tool __maybe_unused,

				    union perf_event *event,

				    struct perf_sample *sample,

				    struct machine *machine)

{

	struct thread *thread;

	struct thread_runtime *tr;

	int err;



	err = perf_event__process_comm(tool, event, sample, machine);

	if (err)

		return err;



	thread = machine__find_thread(machine, sample->pid, sample->tid);

	if (!thread) {

		pr_err("Internal error: can't find thread\n");

		return -1;

	}



	tr = thread__get_runtime(thread);

	if (tr == NULL) {

		thread__put(thread);

		return -1;

	}



	tr->comm_changed = true;

	thread__put(thread);



	return 0;

}



static int perf_sched__read_events(struct perf_sched *sched)

{

	const struct perf_evsel_str_handler handlers[] = {
@@ -3306,7 +3340,7 @@ int cmd_sched(int argc, const char **argv) 
	struct perf_sched sched = {

		.tool = {

			.sample		 = perf_sched__process_tracepoint_sample,

			.comm		 = perf_event__process_comm,

			.comm		 = perf_sched__process_comm,

			.namespaces	 = perf_event__process_namespaces,

			.lost		 = perf_event__process_lost,

			.fork		 = perf_sched__process_fork_event,

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