[PATCH] Add extra disk util name check

[fio.git] / stat.c

diff --git a/stat.c b/stat.c
index 6e55925b1cf288ebadc565a4d4c506248ed22b9e..a84f28a58edf4069091bccf25ffc9801426ce3fb 100644 (file)
--- a/stat.c
+++ b/stat.c
@@ -94,14 +94,26 @@ static int disk_util_exists(dev_t dev)
 
 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);
 
@@ -271,7 +283,7 @@ void update_rusage_stat(struct thread_data *td)
 static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
                    double *mean, double *dev)
 {
-       double n;
+       double n, o;
 
        if (is->samples == 0)
                return 0;
@@ -281,12 +293,17 @@ static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 
        n = (double) is->samples;
        *mean = (double) is->val / n;
-       *dev = 0;
+       *dev = 0.01;
 
-       if (n <= 1)
+       if (n <= 1.0)
                return 1;
 
-       *dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
+       o = (double) is->val_sq - ((*mean * *mean) / n);
+       if (o < 0.0)
+               *dev = -1.0;
+       else
+               *dev = sqrt(o / (n - 1.0));
+
        return 1;
 }