X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=stat.c;h=e974da77ff7ec557728daef9ea5c9e6243018af6;hb=ef11d7376273302d22c7d013bb9c296ee27f4082;hp=3b8fa367c2a936e7fb9d918b2872b4216feb6100;hpb=d0f62ba37546928d3b35b391b7465c6bf8cfe9c5;p=fio.git

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++;
 }