Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cb8874119e9a3ec38c45942808c91cfbc014f402
Commit: cb8874119e9a3ec38c45942808c91cfbc014f402
Parent: 1792669cc1acc2069869b7ca41a0195240de05e0
Author: Jens Axboe <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 19 12:01:16 2007 +1100
Committer: Jens Axboe <[EMAIL PROTECTED]>
CommitDate: Sun Feb 11 23:14:45 2007 +0100
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 <[EMAIL PROTECTED]>
---
block/cfq-iosched.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3df41a0..03b1e47 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;
}
-
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