On (04/02/18 13:14), wen.yang99@xxxxxxxxxx wrote: > > > It's true that this print for the same device is useless. But it's > > useful for different devices. Is it possible to limit the print only > > for the same device? > > In our scene, it's just for the same device (q->queuedata), Thanks. Yes, what Jason meant was that rate limit struct is shared by different call sites - including scsi_request_fn() from different devices. If device1->scsi_request_fn()->sdev_printk_ratelimited() causes printk rate limit, then messages from device2->scsi_request_fn()->sdev_printk_ratelimited() may be lost entirely, unless you have enough of them. -ss
