diff options
Diffstat (limited to 'tools/perf/util/stat.c')
| -rw-r--r-- | tools/perf/util/stat.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c index 23742126f47..6506b3dfb60 100644 --- a/tools/perf/util/stat.c +++ b/tools/perf/util/stat.c @@ -10,6 +10,12 @@ void update_stats(struct stats *stats, u64 val) delta = val - stats->mean; stats->mean += delta / stats->n; stats->M2 += delta*(val - stats->mean); + + if (val > stats->max) + stats->max = val; + + if (val < stats->min) + stats->min = val; } double avg_stats(struct stats *stats) @@ -37,7 +43,7 @@ double stddev_stats(struct stats *stats) { double variance, variance_mean; - if (!stats->n) + if (stats->n < 2) return 0.0; variance = stats->M2 / (stats->n - 1); |