+static void print_disk_util_json(struct disk_util *du, struct json_array *array)
+{
+ double util = 0;
+ struct disk_util_stat *dus = &du->dus;
+ struct disk_util_agg *agg = &du->agg;
+ struct json_object *obj;
+
+ obj = json_create_object();
+ json_array_add_value_object(array, obj);
+
+ if (dus->msec)
+ util = (double) 100 * dus->io_ticks / (double) dus->msec;
+ if (util > 100.0)
+ util = 100.0;
+
+
+ json_object_add_value_string(obj, "name", dus->name);
+ json_object_add_value_int(obj, "read_ios", dus->ios[0]);
+ json_object_add_value_int(obj, "write_ios", dus->ios[1]);
+ json_object_add_value_int(obj, "read_merges", dus->merges[0]);
+ json_object_add_value_int(obj, "write_merges", dus->merges[1]);
+ json_object_add_value_int(obj, "read_ticks", dus->ticks[0]);
+ json_object_add_value_int(obj, "write_ticks", dus->ticks[1]);
+ json_object_add_value_int(obj, "in_queue", dus->time_in_queue);
+ json_object_add_value_float(obj, "util", util);
+
+ /*
+ * If the device has slaves, aggregate the stats for
+ * those slave devices also.
+ */
+ if (!agg->slavecount)
+ return;
+ json_object_add_value_int(obj, "aggr_read_ios",
+ agg->ios[0] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_write_ios",
+ agg->ios[1] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_read_merges",
+ agg->merges[0] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_write_merge",
+ agg->merges[1] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_read_ticks",
+ agg->ticks[0] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_write_ticks",
+ agg->ticks[1] / agg->slavecount);
+ json_object_add_value_int(obj, "aggr_in_queue",
+ agg->time_in_queue / agg->slavecount);
+ json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
+}
+
+void show_disk_util(int terse, struct json_object *parent)