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| author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-06-23 00:08:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 09:45:16 -0700 |
| commit | fde6ad22480cdc2eaa102b805a3ed3ee1d36a376 (patch) | |
| tree | 17489dacb9dcd2fd16d6bd0137098d85520e59b7 /drivers/block/ll_rw_blk.c | |
| parent | 250dccc00805e755a6d80a73557034253da0831f (diff) | |
| download | lwn-fde6ad22480cdc2eaa102b805a3ed3ee1d36a376.tar.gz lwn-fde6ad22480cdc2eaa102b805a3ed3ee1d36a376.zip | |
[PATCH] blk: branch hints
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>
Diffstat (limited to 'drivers/block/ll_rw_blk.c')
| -rw-r--r-- | drivers/block/ll_rw_blk.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index 265de858d4de..1e847151c3a3 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -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); |