From: Changbin Du <changbin...@intel.com>
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
...
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Changbin Du <changbin...@intel.com>
---
v2: add function perf_sched__process_comm() to process PERF_RECORD_COMM event.
---
tools/perf/builtin-sched.c | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 5bfc8d5..7aa0600 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -257,6 +257,7 @@ struct thread_runtime {
u64 migrations;
char shortname[3];
+ bool comm_changed;
};
/* per event run time data */
@@ -1626,7 +1627,7 @@ 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 +1635,7 @@ 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 +1739,37 @@ 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 +3339,7 @@ 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,
--
2.7.4
