On Tue, Mar 29 2005, Nick Piggin wrote:
> @@ -2577,19 +2577,18 @@ static int __make_request(request_queue_
> spin_lock_prefetch(q->queue_lock);
>
> barrier = bio_barrier(bio);
> - if (barrier && (q->ordered == QUEUE_ORDERED_NONE)) {
> + if (unlikely(barrier) && (q->ordered == QUEUE_ORDERED_NONE)) {
> err = -EOPNOTSUPP;
> goto end_io;
> }
>
> -again:
> spin_lock_irq(q->queue_lock);
>
> if (elv_queue_empty(q)) {
> blk_plug_device(q);
> goto get_rq;
> }
This should just goto get_rq, the plug should happen only at the end
where you did add it:
> @@ -2693,10 +2675,11 @@ get_rq:
> req->rq_disk = bio->bi_bdev->bd_disk;
> req->start_time = jiffies;
>
> + spin_lock_irq(q->queue_lock);
> + if (elv_queue_empty(q))
> + blk_plug_device(q);
> add_request(q, req);
> out:
> - if (freereq)
> - __blk_put_request(q, freereq);
> if (bio_sync(bio))
> __generic_unplug_device(q);
>
--
Jens Axboe
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
