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Subject[PATCH] perf sched map: re-annotate shortname if thread comm changed
Date
From: Changbin Du <changbin.du@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 => pi:22368
. *. . 80393.056854 secs
*B0 . . 80393.060727 secs
...

Signed-off-by: Changbin Du <changbin.du@intel.com>
---
tools/perf/builtin-sched.c | 4 +++-
tools/perf/util/thread.c | 1 +
tools/perf/util/thread.h | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 83283fe..53bb8df 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1580,7 +1580,7 @@ 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 || sched_in->comm_changed || (verbose > 0 && sched_in->tid)) {
const char *pid_color = color;

if (thread__has_color(sched_in))
@@ -1588,6 +1588,8 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,

color_fprintf(stdout, pid_color, "%s => %s:%d",
sched_in->shortname, thread__comm_str(sched_in), sched_in->tid);
+
+ sched_in->comm_changed = false;
}

if (sched->map.comp && new_cpu)
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 68b65b1..c660fe6 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -212,6 +212,7 @@ static int ____thread__set_comm(struct thread *thread, const char *str,
unwind__flush_access(thread);
}

+ thread->comm_changed = true;
thread->comm_set = true;

return 0;
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 40cfa36..b9a328b 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -27,6 +27,7 @@ struct thread {
int cpu;
refcount_t refcnt;
char shortname[3];
+ bool comm_changed;
bool comm_set;
int comm_len;
bool dead; /* if set thread has exited */
--
2.7.4
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