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| author | Ingo Molnar <mingo@elte.hu> | 2011-04-27 07:35:39 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-04-26 22:04:57 +0400 |
| commit | f99844cb76b7d347711c22cdcb94266b7214141f (patch) | |
| tree | 37d8147d32f9e76269952f142180566e937c4d71 /tools/perf | |
| parent | 1fc570ad89e55dc32dfa4dda1311948b38f26524 (diff) | |
| download | linux-f99844cb76b7d347711c22cdcb94266b7214141f.tar.xz | |
perf stat: Fix -nan% output in perf stat noise printouts
Before:
0 CPU-migrations # 0.000 M/sec ( +- -nan% )
After:
0 CPU-migrations # 0.000 M/sec ( +- 0.00% )
Also factor out the noise printing function.
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-z89h2v1bk1mikcbsf7e6v34q@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/builtin-stat.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 924d18c407b8..845ded8f15a2 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -382,6 +382,16 @@ static int run_perf_stat(int argc __used, const char **argv) return WEXITSTATUS(status); } +static void print_noise_pct(double total, double avg) +{ + double pct = 0.0; + + if (avg) + pct = 100.0*total/avg; + + fprintf(stderr, " ( +-%6.2f%% )", pct); +} + static void print_noise(struct perf_evsel *evsel, double avg) { struct perf_stat *ps; @@ -390,8 +400,7 @@ static void print_noise(struct perf_evsel *evsel, double avg) return; ps = evsel->priv; - fprintf(stderr, " ( +- %7.3f%% )", - 100 * stddev_stats(&ps->res_stats[0]) / avg); + print_noise_pct(stddev_stats(&ps->res_stats[0]), avg); } static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg) @@ -635,9 +644,8 @@ static void print_stat(int argc, const char **argv) fprintf(stderr, " %18.9f seconds time elapsed", avg_stats(&walltime_nsecs_stats)/1e9); if (run_count > 1) { - fprintf(stderr, " ( +-%5.2f%% )", - 100*stddev_stats(&walltime_nsecs_stats) / - avg_stats(&walltime_nsecs_stats)); + print_noise_pct(stddev_stats(&walltime_nsecs_stats), + avg_stats(&walltime_nsecs_stats)); } fprintf(stderr, "\n\n"); } |