From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 29 Mar 2007 13:36:29 +0000 (+0200)
Subject: Save a division, if delta is non-zero.
X-Git-Tag: fio-1.15.1~6
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=ef11d7376273302d22c7d013bb9c296ee27f4082

Save a division, if delta is non-zero.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/stat.c b/stat.c
index 3b8fa367..e974da77 100644
--- a/stat.c
+++ b/stat.c
@@ -817,8 +817,10 @@ static inline void add_stat_sample(struct io_stat *is, unsigned long data)
 		is->min_val = data;
 
 	delta = val - is->mean;
-	is->mean += delta / (is->samples + 1.0);
-	is->S += delta * (val - is->mean);
+	if (delta) {
+		is->mean += delta / (is->samples + 1.0);
+		is->S += delta * (val - is->mean);
+	}
 
 	is->samples++;
 }