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Subject[PATCH] perf stat: Fix no metric header if --per-socket and --metric-only set
Date
We received a report that was no metric header displayed if --per-socket
and --metric-only were both set.

It's hard for script to parse the perf-stat output. This patch fixes this
issue.

Before:

root@kbl-ppc:~# perf stat -a -M CPI --metric-only --per-socket
^C
Performance counter stats for 'system wide':

S0 8 2.6

2.215270071 seconds time elapsed

root@kbl-ppc:~# perf stat -a -M CPI --metric-only --per-socket -I1000
# time socket cpus
1.000411692 S0 8 2.2
2.001547952 S0 8 3.4
3.002446511 S0 8 3.4
4.003346157 S0 8 4.0
5.004245736 S0 8 0.3

After:

root@kbl-ppc:~# perf stat -a -M CPI --metric-only --per-socket
^C
Performance counter stats for 'system wide':

CPI
S0 8 2.1

1.813579830 seconds time elapsed

root@kbl-ppc:~# perf stat -a -M CPI --metric-only --per-socket -I1000
# time socket cpus CPI
1.000415122 S0 8 3.2
2.001630051 S0 8 2.9
3.002612278 S0 8 4.3
4.003523594 S0 8 3.0
5.004504256 S0 8 3.7

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/stat-shadow.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 0fd713d3674f..03ecb8cd0eec 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -803,8 +803,11 @@ static void generic_metric(struct perf_stat_config *config,
out->force_header ?
(metric_name ? metric_name : name) : "", 0);
}
- } else
- print_metric(config, ctxp, NULL, NULL, "", 0);
+ } else {
+ print_metric(config, ctxp, NULL, NULL,
+ out->force_header ?
+ (metric_name ? metric_name : name) : "", 0);
+ }

for (i = 1; i < pctx.num_ids; i++)
zfree(&pctx.ids[i].name);
--
2.17.1
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