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Commit b52a8348 authored by Jens Axboe's avatar Jens Axboe
Browse files

[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: default avatarJens Axboe <axboe@suse.de>
parent ae818a38

block/cfq-iosched.c

+5 −2
Original line number Diff line number Diff line
@@ -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;

	}