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Commit 981a7973 authored by Jens Axboe's avatar Jens Axboe Committed by Jens Axboe
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[PATCH] cfq-iosched: kill the empty_list 



No point in having a place holder list just for empty queues, so remove
it. It's not used for anything other than to keep ->cfq_list busy.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent 53b03744

block/cfq-iosched.c

+2 −8
Original line number Diff line number Diff line
@@ -81,11 +81,6 @@ struct cfq_data { 
	struct list_head idle_rr;

	unsigned int busy_queues;



	/*

	 * non-ordered list of empty cfqq's

	 */

	struct list_head empty_list;



	/*

	 * cfqq lookup hash

	 */
@@ -136,7 +131,7 @@ struct cfq_queue { 
	struct hlist_node cfq_hash;

	/* hash key */

	unsigned int key;

	/* on either rr or empty list of cfqd */

	/* member of the rr/busy/cur/idle cfqd list */

	struct list_head cfq_list;

	/* sorted list of pending requests */

	struct rb_root sort_list;
@@ -417,7 +412,7 @@ cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) 
{

	BUG_ON(!cfq_cfqq_on_rr(cfqq));

	cfq_clear_cfqq_on_rr(cfqq);

	list_move(&cfqq->cfq_list, &cfqd->empty_list);

	list_del_init(&cfqq->cfq_list);



	BUG_ON(!cfqd->busy_queues);

	cfqd->busy_queues--;
@@ -1959,7 +1954,6 @@ static void *cfq_init_queue(request_queue_t *q, elevator_t *e) 
	INIT_LIST_HEAD(&cfqd->busy_rr);

	INIT_LIST_HEAD(&cfqd->cur_rr);

	INIT_LIST_HEAD(&cfqd->idle_rr);

	INIT_LIST_HEAD(&cfqd->empty_list);

	INIT_LIST_HEAD(&cfqd->cic_list);



	cfqd->cfq_hash = kmalloc_node(sizeof(struct hlist_head) * CFQ_QHASH_ENTRIES, GFP_KERNEL, q->node);