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authorJens Axboe <jens.axboe@oracle.com>2007-01-19 12:01:16 +1100
committerJens Axboe <axboe@carl.home.kernel.dk>2007-02-11 23:14:45 +0100
commitcb8874119e9a3ec38c45942808c91cfbc014f402 (patch)
tree410562c9c72499ab208b5526fb35736c48520638 /block/cfq-iosched.c
parent1792669cc1acc2069869b7ca41a0195240de05e0 (diff)
downloadlinux-2.6.34-ux500-cb8874119e9a3ec38c45942808c91cfbc014f402.tar.gz
cfq-iosched: tweak the FIFO checking
We currently check the FIFO once per slice. Optimize that a bit and only do it as the first thing for a new slice, so we don't end up doing a single request and then seek to the FIFO requests. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3df41a00b55..03b1e474b2b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -885,16 +885,17 @@ static inline struct request *cfq_check_fifo(struct cfq_queue *cfqq)
if (cfq_cfqq_fifo_expire(cfqq))
return NULL;
+
+ cfq_mark_cfqq_fifo_expire(cfqq);
+
if (list_empty(&cfqq->fifo))
return NULL;
fifo = cfq_cfqq_class_sync(cfqq);
rq = rq_entry_fifo(cfqq->fifo.next);
- if (time_after(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo])) {
- cfq_mark_cfqq_fifo_expire(cfqq);
+ if (time_after(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo]))
return rq;
- }
return NULL;
}