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

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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: Changbin Du <changbin.du@intel.com>
Acked-by: Jiri 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Changbin Du 2018-03-06 11:37:37 +08:00 committed by Arnaldo Carvalho de Melo
parent 8640da9f4f
commit 99a3c3a913
1 changed files with 36 additions and 2 deletions
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38
tools/perf/builtin-sched.c
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@ -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,