When only the instructions event is requested:
$ perf stat -e instructions git s
M builtin-stat.c
Performance counter stats for 'git s':
917,453,420 instructions # 0.00 insns per cycle
0.213002926 seconds time elapsed
The 0.00 insns per cycle comment in the output is totally bogus and
misleading. It happens because update_shadow_stats() doesn't touch
runtime_cycles_stats when only the instructions event is requested. So,
omit printing the bogus data altogether.
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
Signed-off-by: Ramkumar Ramachandra <artag...@gmail.com>
---
tools/perf/builtin-stat.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index cc167ae..0b747a5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -852,11 +852,10 @@ static void abs_printout(int cpu, int nr, struct
perf_evsel *evsel, double avg)
if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
total = avg_stats(&runtime_cycles_stats[cpu]);
- if (total)
+ if (total) {
ratio = avg / total;
-
- fprintf(output, " # %5.2f insns per cycle ", ratio);
-
+ fprintf(output, " # %5.2f insns per cycle ",
ratio);
+ }
total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
total = max(total,
avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
--
1.8.4.477.g5d89aa9
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