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Subject[PATCH 8/8] perf tools: Clarify the output of perf sched map.
Date
From: Dongsheng <yangds.fnst@cn.fujitsu.com>

In output of perf sched map, any shortname of thread will be explained
at the first time when it appear.

Example:
*A0 228836.978985 secs A0 => perf:23032
*. A0 228836.979016 secs B0 => swapper:0
. *C0 228836.979099 secs C0 => migration/3:22
*A0 . C0 228836.979115 secs
A0 . *. 228836.979115 secs

But B0, which is explained as swapper:0 did not appear in the
left part of output. Instead, we use '.' as the shortname of
swapper:0. So the comment of "B0 => swapper:0" is not easy to
understand.

This patch clarify the output of perf sched map with not allocating
one letter-number shortname for swapper:0 and print ". => swapper:0"
as the explaination for swapper:0.

Example:
*A0 228836.978985 secs A0 => perf:23032
* . A0 228836.979016 secs . => swapper:0
. *B0 228836.979099 secs B0 => migration/3:22
*A0 . B0 228836.979115 secs
A0 . * . 228836.979115 secs
A0 *C0 . 228836.979225 secs C0 => ksoftirqd/2:18
A0 *D0 . 228836.979236 secs D0 => rcu_sched:7

Signed-off-by: Dongsheng <yangds.fnst@cn.fujitsu.com>
---
tools/perf/builtin-sched.c | 35 +++++++++++++++++++----------------
1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 030b7d0..727b8a0 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1359,17 +1359,23 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,

new_shortname = 0;
if (!sched_in->shortname[0]) {
- sched_in->shortname[0] = sched->next_shortname1;
- sched_in->shortname[1] = sched->next_shortname2;
-
- if (sched->next_shortname1 < 'Z') {
- sched->next_shortname1++;
- } else {
- sched->next_shortname1='A';
- if (sched->next_shortname2 < '9') {
- sched->next_shortname2++;
+ if (!strcmp(thread__comm_str(sched_in), "swapper")) {
+ sched_in->shortname[0] = '.';
+ sched_in->shortname[1] = '\0';
+ }
+ else {
+ sched_in->shortname[0] = sched->next_shortname1;
+ sched_in->shortname[1] = sched->next_shortname2;
+
+ if (sched->next_shortname1 < 'Z') {
+ sched->next_shortname1++;
} else {
- sched->next_shortname2='0';
+ sched->next_shortname1='A';
+ if (sched->next_shortname2 < '9') {
+ sched->next_shortname2++;
+ } else {
+ sched->next_shortname2='0';
+ }
}
}
new_shortname = 1;
@@ -1381,12 +1387,9 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
else
printf("*");

- if (sched->curr_thread[cpu]) {
- if (sched->curr_thread[cpu]->tid)
- printf("%2s ", sched->curr_thread[cpu]->shortname);
- else
- printf(". ");
- } else
+ if (sched->curr_thread[cpu])
+ printf("%2s ", sched->curr_thread[cpu]->shortname);
+ else
printf(" ");
}

--
1.8.2.1


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