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Save a division, if delta is non-zero.
author
Jens Axboe
<jens.axboe@oracle.com>
Thu, 29 Mar 2007 13:36:29 +0000
(15:36 +0200)
committer
Jens Axboe
<jens.axboe@oracle.com>
Thu, 29 Mar 2007 13:36:29 +0000
(15:36 +0200)
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
stat.c
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diff --git
a/stat.c
b/stat.c
index 3b8fa367c2a936e7fb9d918b2872b4216feb6100..e974da77ff7ec557728daef9ea5c9e6243018af6 100644
(file)
--- 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->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++;
}
is->samples++;
}