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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>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200331180226.25915-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
8358f698ec