perf stat: Don't print bogus data on -e instructions
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. Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1380616604-4077-1-git-send-email-artagnon@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -930,11 +930,10 @@ static void abs_printout(int cpu, int nr, struct perf_evsel *evsel, double avg)
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if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
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total = avg_stats(&runtime_cycles_stats[cpu]);
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if (total)
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if (total) {
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ratio = avg / total;
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fprintf(output, " # %5.2f insns per cycle ", ratio);
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fprintf(output, " # %5.2f insns per cycle ", ratio);
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}
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total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
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total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
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