static void disk_util_add(dev_t dev, char *path)
{
- struct disk_util *du = malloc(sizeof(*du));
+ struct disk_util *du, *__du;
+ struct list_head *entry;
+ du = malloc(sizeof(*du));
memset(du, 0, sizeof(*du));
INIT_LIST_HEAD(&du->list);
sprintf(du->path, "%s/stat", path);
du->name = strdup(basename(path));
du->dev = dev;
+ list_for_each(entry, &disk_list) {
+ __du = list_entry(entry, struct disk_util, list);
+
+ if (!strcmp(du->name, __du->name)) {
+ free(du->name);
+ free(du);
+ return;
+ }
+ }
+
fio_gettime(&du->time, NULL);
get_io_ticks(du, &du->last_dus);
static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
double *mean, double *dev)
{
- double n;
+ double n = is->samples;
if (is->samples == 0)
return 0;
*max = is->max_val;
n = (double) is->samples;
- *mean = (double) is->val / n;
- *dev = 0;
+ *mean = is->mean;
- if (n <= 1)
- return 1;
+ if (n > 1.0)
+ *dev = sqrt(is->S / (n - 1.0));
+ else
+ *dev = -1.0;
- *dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
return 1;
}
free(runstats);
}
-static inline void add_stat_sample(struct io_stat *is, unsigned long val)
+static inline void add_stat_sample(struct io_stat *is, unsigned long data)
{
- if (val > is->max_val)
- is->max_val = val;
- if (val < is->min_val)
- is->min_val = val;
+ double val = data;
+ double delta, n;
+
+ if (data > is->max_val)
+ is->max_val = data;
+ if (data < is->min_val)
+ is->min_val = data;
+
+ delta = val - is->mean;
+ n = is->samples + 1.0;
+ is->mean += delta / n;
+ is->S += delta * (val - is->mean);
- is->val += val;
- is->val_sq += val * val;
is->samples++;
}