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block/nbd: micro-optimization in nbd request completion 

Add in-flight cmds to the tail. That way while searching
(during request completion),we will always get a hit on the
first element.

Signed-off-by: Chetan Loke <loke.chetan@gmail.com>
Acked-by: Paul.Clements@steeleye.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chetan Loke 2012-07-31 08:47:13 +02:00 committed by Jens Axboe
parent 72ea1f74fc
commit 01ff5dbc09
1 changed files with 1 additions and 1 deletions
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2
drivers/block/nbd.c
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@ -481,7 +481,7 @@ static void nbd_handle_req(struct nbd_device *nbd, struct request *req)
nbd_end_request(req);
} else {
spin_lock(&nbd->queue_lock);
list_add(&req->queuelist, &nbd->queue_head);
list_add_tail(&req->queuelist, &nbd->queue_head);
spin_unlock(&nbd->queue_lock);
}