On 2011-04-19 18:48, Christoph Hellwig wrote: >> + blk_run_queue_async(sdev->request_queue); > > This doesn't even have to be async except when scsi drivers call > cmd->scsi_done directly. It seems like if this always went through the > softirq (or kblockd) we could still run it in context for the others.
Exactly. I'll pass an 'optimize' patch past James. >> + /* >> + * This get/put dance makes no sense >> + */ >> get_device(&rport->dev); >> - >> - spin_lock_irqsave(rport->rqst_q->queue_lock, flags); >> - flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) && >> - !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags); >> - if (flagset) >> - queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q); >> - __blk_run_queue(rport->rqst_q); >> - if (flagset) >> - queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q); >> - spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags); >> - >> + blk_run_queue_async(rport->rqst_q); > > And the QUEUE_FLAG_REENTER mess here never made sense either as it > tested for a bit beeing set and not set at the same time. So this one > actually should be able to be replaced by a plain blk_run_queue. Yep, it's completely broken as-is. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
