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[PATCH] blk: branch hints

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Sprinkle around a few branch hints in the block layer.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2005-06-23 00:08:53 -07:00 committed by Linus Torvalds
parent 250dccc008
commit fde6ad2248
1 changed files with 6 additions and 6 deletions
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12
drivers/block/ll_rw_blk.c
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@ -1439,7 +1439,7 @@ EXPORT_SYMBOL(blk_remove_plug);
*/
void __generic_unplug_device(request_queue_t *q)
{
if (test_bit(QUEUE_FLAG_STOPPED, &q->queue_flags))
if (unlikely(test_bit(QUEUE_FLAG_STOPPED, &q->queue_flags)))
return;
if (!blk_remove_plug(q))
@ -1763,7 +1763,7 @@ EXPORT_SYMBOL(blk_init_queue_node);
int blk_get_queue(request_queue_t *q)
{
if (!test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
if (likely(!test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
atomic_inc(&q->refcnt);
return 0;
}
@ -2584,7 +2584,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
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;
}
@ -2685,7 +2685,7 @@ get_rq:
/*
* REQ_BARRIER implies no merging, but lets make it explicit
*/
if (barrier)
if (unlikely(barrier))
req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
req->errors = 0;
@ -2809,7 +2809,7 @@ static inline void block_wait_queue_running(request_queue_t *q)
{
DEFINE_WAIT(wait);
while (test_bit(QUEUE_FLAG_DRAIN, &q->queue_flags)) {
while (unlikely(test_bit(QUEUE_FLAG_DRAIN, &q->queue_flags))) {
struct request_list *rl = &q->rq;
prepare_to_wait_exclusive(&rl->drain, &wait,
@ -2918,7 +2918,7 @@ end_io:
goto end_io;
}
if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))
if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)))
goto end_io;
block_wait_queue_running(q);