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Date: Mon, 10 Feb 2014 12:29:01 -0500 From: Don Zickus <dzickus@...hat.com> To: acme@...stprotocols.net Cc: LKML <linux-kernel@...r.kernel.org>, jolsa@...hat.com, jmario@...hat.com, fowles@...each.com, eranian@...gle.com, Don Zickus <dzickus@...hat.com> Subject: [PATCH 06/21] perf, stat: FIXME Stddev calculation is incorrect Fix the standard deviation calculation. The current calculation does the standard deviation mean which is slightly different. Signed-off-by: Don Zickus <dzickus@...hat.com> --- tools/perf/util/stat.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c index 6506b3d..58aa661 100644 --- a/tools/perf/util/stat.c +++ b/tools/perf/util/stat.c @@ -47,7 +47,8 @@ double stddev_stats(struct stats *stats) return 0.0; variance = stats->M2 / (stats->n - 1); - variance_mean = variance / stats->n; + //variance_mean = variance / stats->n; + variance_mean = variance; return sqrt(variance_mean); } -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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