}
}
+/* Anything goes as long as it is not a constant. */
+static uint32_t pick_random_zone_idx(const struct fio_file *f,
+ const struct io_u *io_u)
+{
+ return io_u->offset * f->zbd_info->num_open_zones / f->real_file_size;
+}
+
/*
* Modify the offset of an I/O unit that does not refer to an open zone such
* that it refers to an open zone. Close an open zone and open a new zone if
* This statement accesses f->zbd_info->open_zones[] on purpose
* without locking.
*/
- zone_idx = f->zbd_info->open_zones[(io_u->offset -
- f->file_offset) *
- f->zbd_info->num_open_zones / f->io_size];
+ zone_idx = f->zbd_info->open_zones[pick_random_zone_idx(f, io_u)];
} else {
zone_idx = zbd_zone_idx(f, io_u->offset);
}
* has been obtained. Hence the loop.
*/
for (;;) {
+ uint32_t tmp_idx;
+
z = &f->zbd_info->zone_info[zone_idx];
zone_lock(td, z);
__func__, f->file_name);
return NULL;
}
- open_zone_idx = (io_u->offset - f->file_offset) *
- f->zbd_info->num_open_zones / f->io_size;
+
+ /*
+ * List of opened zones is per-device, shared across all threads.
+ * Start with quasi-random candidate zone.
+ * Ignore zones which don't belong to thread's offset/size area.
+ */
+ open_zone_idx = pick_random_zone_idx(f, io_u);
assert(open_zone_idx < f->zbd_info->num_open_zones);
+ tmp_idx = open_zone_idx;
+ for (i = 0; i < f->zbd_info->num_open_zones; i++) {
+ uint32_t tmpz;
+
+ if (tmp_idx >= f->zbd_info->num_open_zones)
+ tmp_idx = 0;
+ tmpz = f->zbd_info->open_zones[tmp_idx];
+
+ if (is_valid_offset(f, f->zbd_info->zone_info[tmpz].start)) {
+ open_zone_idx = tmp_idx;
+ goto found_candidate_zone;
+ }
+
+ tmp_idx++;
+ }
+
+ dprint(FD_ZBD, "%s(%s): no candidate zone\n",
+ __func__, f->file_name);
+ return NULL;
+
+found_candidate_zone:
new_zone_idx = f->zbd_info->open_zones[open_zone_idx];
if (new_zone_idx == zone_idx)
break;