poll_delay
QUEUE_SYSFS_SHOW_CONST(poll_delay, -1)
poll_delay(delay);
poll_delay(delay);
poll_delay(delay);
poll_delay(delay);
poll_delay(delay);
int poll_delay; /* milliseconds */
instance->poll_delay = min(2 * instance->poll_delay, MAX_POLL_DELAY);
instance->poll_delay = max(instance->poll_delay / 2, MIN_POLL_DELAY);
if (instance->poll_delay < MAX_POLL_DELAY)
mod_timer(&instance->status_check_timer, jiffies + msecs_to_jiffies(instance->poll_delay));
instance->poll_delay = MIN_POLL_DELAY;