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[PATCH] cfq-iosched: busy_rr fairness fix 

Now that we select busy_rr for possible service, insert entries at the
back of that list instead of at the front.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-06-01 18:53:43 +02:00
parent ae818a38d4
commit b52a834892
1 changed files with 5 additions and 2 deletions
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7
block/cfq-iosched.c
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@ -501,10 +501,13 @@ static void cfq_resort_rr_list(struct cfq_queue *cfqq, int preempted)
/*
* if queue was preempted, just add to front to be fair. busy_rr
* isn't sorted.
* isn't sorted, but insert at the back for fairness.
*/
if (preempted || list == &cfqd->busy_rr) {
list_add(&cfqq->cfq_list, list);
if (preempted)
list = list->prev;
list_add_tail(&cfqq->cfq_list, list);
return;
}