Commit 80f50691 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cciss: Add cciss_allow_hpsa module parameter
  cciss: Fix multiple calls to pci_release_regions
  blk-settings: fix function parameter kernel-doc notation
  writeback: kill space in debugfs item name
  writeback: account IO throttling wait as iowait
  elv_iosched_store(): fix strstrip() misuse
  cfq-iosched: avoid probable slice overrun when idling
  cfq-iosched: apply bool value where we return 0/1
  cfq-iosched: fix think time allowed for seekers
  cfq-iosched: fix the slice residual sign
  cfq-iosched: abstract out the 'may this cfqq dispatch' logic
  block: use proper BLK_RW_ASYNC in blk_queue_start_tag()
  block: Seperate read and write statistics of in_flight requests v2
  block: get rid of kblock_schedule_delayed_work()
  cfq-iosched: fix possible problem with jiffies wraparound
  cfq-iosched: fix issue with rq-rq merging and fifo list ordering
parents a3bafbbb 2ec24ff1

block/blk-core.c

+4 −12
Original line number Diff line number Diff line
@@ -70,7 +70,7 @@ static void drive_stat_acct(struct request *rq, int new_io) 
		part_stat_inc(cpu, part, merges[rw]);

	else {

		part_round_stats(cpu, part);

		part_inc_in_flight(part);

		part_inc_in_flight(part, rw);

	}



	part_stat_unlock();
@@ -1030,9 +1030,9 @@ static void part_round_stats_single(int cpu, struct hd_struct *part, 
	if (now == part->stamp)

		return;



	if (part->in_flight) {

	if (part_in_flight(part)) {

		__part_stat_add(cpu, part, time_in_queue,

				part->in_flight * (now - part->stamp));

				part_in_flight(part) * (now - part->stamp));

		__part_stat_add(cpu, part, io_ticks, (now - part->stamp));

	}

	part->stamp = now;
@@ -1739,7 +1739,7 @@ static void blk_account_io_done(struct request *req) 
		part_stat_inc(cpu, part, ios[rw]);

		part_stat_add(cpu, part, ticks[rw], duration);

		part_round_stats(cpu, part);

		part_dec_in_flight(part);

		part_dec_in_flight(part, rw);



		part_stat_unlock();

	}
@@ -2492,14 +2492,6 @@ int kblockd_schedule_work(struct request_queue *q, struct work_struct *work) 
}

EXPORT_SYMBOL(kblockd_schedule_work);



int kblockd_schedule_delayed_work(struct request_queue *q,

				  struct delayed_work *work,

				  unsigned long delay)

{

	return queue_delayed_work(kblockd_workqueue, work, delay);

}

EXPORT_SYMBOL(kblockd_schedule_delayed_work);



int __init blk_dev_init(void)

{

	BUILD_BUG_ON(__REQ_NR_BITS > 8 *

block/blk-merge.c

+1 −1
Original line number Diff line number Diff line
@@ -351,7 +351,7 @@ static void blk_account_io_merge(struct request *req) 
		part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));



		part_round_stats(cpu, part);

		part_dec_in_flight(part);

		part_dec_in_flight(part, rq_data_dir(req));



		part_stat_unlock();

	}

block/blk-settings.c

+1 −1
Original line number Diff line number Diff line
@@ -242,7 +242,7 @@ EXPORT_SYMBOL(blk_queue_max_hw_sectors); 
/**

 * blk_queue_max_discard_sectors - set max sectors for a single discard

 * @q:  the request queue for the device

 * @max_discard: maximum number of sectors to discard

 * @max_discard_sectors: maximum number of sectors to discard

 **/

void blk_queue_max_discard_sectors(struct request_queue *q,

		unsigned int max_discard_sectors)

block/blk-tag.c

+1 −1
Original line number Diff line number Diff line
@@ -359,7 +359,7 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq) 
		max_depth -= 2;

		if (!max_depth)

			max_depth = 1;

		if (q->in_flight[0] > max_depth)

		if (q->in_flight[BLK_RW_ASYNC] > max_depth)

			return 1;

	}

block/cfq-iosched.c

+142 −117
Original line number Diff line number Diff line
@@ -150,7 +150,7 @@ struct cfq_data { 
	 * idle window management

	 */

	struct timer_list idle_slice_timer;

	struct delayed_work unplug_work;

	struct work_struct unplug_work;



	struct cfq_queue *active_queue;

	struct cfq_io_context *active_cic;
@@ -230,7 +230,7 @@ CFQ_CFQQ_FNS(coop); 
	blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)



static void cfq_dispatch_insert(struct request_queue *, struct request *);

static struct cfq_queue *cfq_get_queue(struct cfq_data *, int,

static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool,

				       struct io_context *, gfp_t);

static struct cfq_io_context *cfq_cic_lookup(struct cfq_data *,

						struct io_context *);
@@ -241,40 +241,35 @@ static inline int rq_in_driver(struct cfq_data *cfqd) 
}



static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_context *cic,

					    int is_sync)

					    bool is_sync)

{

	return cic->cfqq[!!is_sync];

	return cic->cfqq[is_sync];

}



static inline void cic_set_cfqq(struct cfq_io_context *cic,

				struct cfq_queue *cfqq, int is_sync)

				struct cfq_queue *cfqq, bool is_sync)

{

	cic->cfqq[!!is_sync] = cfqq;

	cic->cfqq[is_sync] = cfqq;

}



/*

 * We regard a request as SYNC, if it's either a read or has the SYNC bit

 * set (in which case it could also be direct WRITE).

 */

static inline int cfq_bio_sync(struct bio *bio)

static inline bool cfq_bio_sync(struct bio *bio)

{

	if (bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO))

		return 1;



	return 0;

	return bio_data_dir(bio) == READ || bio_rw_flagged(bio, BIO_RW_SYNCIO);

}



/*

 * scheduler run of queue, if there are requests pending and no one in the

 * driver that will restart queueing

 */

static inline void cfq_schedule_dispatch(struct cfq_data *cfqd,

					 unsigned long delay)

static inline void cfq_schedule_dispatch(struct cfq_data *cfqd)

{

	if (cfqd->busy_queues) {

		cfq_log(cfqd, "schedule dispatch");

		kblockd_schedule_delayed_work(cfqd->queue, &cfqd->unplug_work,

						delay);

		kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work);

	}

}
@@ -290,7 +285,7 @@ static int cfq_queue_empty(struct request_queue *q) 
 * if a queue is marked sync and has sync io queued. A sync queue with async

 * io only, should not get full sync slice length.

 */

static inline int cfq_prio_slice(struct cfq_data *cfqd, int sync,

static inline int cfq_prio_slice(struct cfq_data *cfqd, bool sync,

				 unsigned short prio)

{

	const int base_slice = cfqd->cfq_slice[sync];
@@ -318,7 +313,7 @@ cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) 
 * isn't valid until the first request from the dispatch is activated

 * and the slice time set.

 */

static inline int cfq_slice_used(struct cfq_queue *cfqq)

static inline bool cfq_slice_used(struct cfq_queue *cfqq)

{

	if (cfq_cfqq_slice_new(cfqq))

		return 0;
@@ -493,7 +488,7 @@ static unsigned long cfq_slice_offset(struct cfq_data *cfqd, 
 * we will service the queues.

 */

static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq,

				 int add_front)

				 bool add_front)

{

	struct rb_node **p, *parent;

	struct cfq_queue *__cfqq;
@@ -509,11 +504,20 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
		} else

			rb_key += jiffies;

	} else if (!add_front) {

		/*

		 * Get our rb key offset. Subtract any residual slice

		 * value carried from last service. A negative resid

		 * count indicates slice overrun, and this should position

		 * the next service time further away in the tree.

		 */

		rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies;

		rb_key += cfqq->slice_resid;

		rb_key -= cfqq->slice_resid;

		cfqq->slice_resid = 0;

	} else

		rb_key = 0;

	} else {

		rb_key = -HZ;

		__cfqq = cfq_rb_first(&cfqd->service_tree);

		rb_key += __cfqq ? __cfqq->rb_key : jiffies;

	}



	if (!RB_EMPTY_NODE(&cfqq->rb_node)) {

		/*
@@ -547,7 +551,7 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
			n = &(*p)->rb_left;

		else if (cfq_class_idle(cfqq) > cfq_class_idle(__cfqq))

			n = &(*p)->rb_right;

		else if (rb_key < __cfqq->rb_key)

		else if (time_before(rb_key, __cfqq->rb_key))

			n = &(*p)->rb_left;

		else

			n = &(*p)->rb_right;
@@ -827,8 +831,10 @@ cfq_merged_requests(struct request_queue *q, struct request *rq, 
	 * reposition in fifo if next is older than rq

	 */

	if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) &&

	    time_before(next->start_time, rq->start_time))

	    time_before(rq_fifo_time(next), rq_fifo_time(rq))) {

		list_move(&rq->queuelist, &next->queuelist);

		rq_set_fifo_time(rq, rq_fifo_time(next));

	}



	cfq_remove_request(next);

}
@@ -844,7 +850,7 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq, 
	 * Disallow merge of a sync bio into an async request.

	 */

	if (cfq_bio_sync(bio) && !rq_is_sync(rq))

		return 0;

		return false;



	/*

	 * Lookup the cfqq that this bio will be queued with. Allow
@@ -852,13 +858,10 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq, 
	 */

	cic = cfq_cic_lookup(cfqd, current->io_context);

	if (!cic)

		return 0;

		return false;



	cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio));

	if (cfqq == RQ_CFQQ(rq))

		return 1;



	return 0;

	return cfqq == RQ_CFQQ(rq);

}



static void __cfq_set_active_queue(struct cfq_data *cfqd,
@@ -886,7 +889,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd, 
 */

static void

__cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,

		    int timed_out)

		    bool timed_out)

{

	cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out);
@@ -914,7 +917,7 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
	}

}



static inline void cfq_slice_expired(struct cfq_data *cfqd, int timed_out)

static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out)

{

	struct cfq_queue *cfqq = cfqd->active_queue;
@@ -1026,7 +1029,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, 
 */

static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,

					      struct cfq_queue *cur_cfqq,

					      int probe)

					      bool probe)

{

	struct cfq_queue *cfqq;
@@ -1090,6 +1093,15 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) 
	if (!cic || !atomic_read(&cic->ioc->nr_tasks))

		return;



	/*

	 * If our average think time is larger than the remaining time

	 * slice, then don't idle. This avoids overrunning the allotted

	 * time slice.

	 */

	if (sample_valid(cic->ttime_samples) &&

	    (cfqq->slice_end - jiffies < cic->ttime_mean))

		return;



	cfq_mark_cfqq_wait_request(cfqq);



	/*
@@ -1129,9 +1141,7 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) 
 */

static struct request *cfq_check_fifo(struct cfq_queue *cfqq)

{

	struct cfq_data *cfqd = cfqq->cfqd;

	struct request *rq;

	int fifo;

	struct request *rq = NULL;



	if (cfq_cfqq_fifo_expire(cfqq))

		return NULL;
@@ -1141,13 +1151,11 @@ static struct request *cfq_check_fifo(struct cfq_queue *cfqq) 
	if (list_empty(&cfqq->fifo))

		return NULL;



	fifo = cfq_cfqq_sync(cfqq);

	rq = rq_entry_fifo(cfqq->fifo.next);



	if (time_before(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo]))

	if (time_before(jiffies, rq_fifo_time(rq)))

		rq = NULL;



	cfq_log_cfqq(cfqd, cfqq, "fifo=%p", rq);

	cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq);

	return rq;

}
@@ -1248,67 +1256,21 @@ static int cfq_forced_dispatch(struct cfq_data *cfqd) 
	return dispatched;

}



/*

 * Dispatch a request from cfqq, moving them to the request queue

 * dispatch list.

 */

static void cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq)

static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq)

{

	struct request *rq;



	BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list));



	/*

	 * follow expired path, else get first next available

	 */

	rq = cfq_check_fifo(cfqq);

	if (!rq)

		rq = cfqq->next_rq;



	/*

	 * insert request into driver dispatch list

	 */

	cfq_dispatch_insert(cfqd->queue, rq);



	if (!cfqd->active_cic) {

		struct cfq_io_context *cic = RQ_CIC(rq);



		atomic_long_inc(&cic->ioc->refcount);

		cfqd->active_cic = cic;

	}

}



/*

 * Find the cfqq that we need to service and move a request from that to the

 * dispatch list

 */

static int cfq_dispatch_requests(struct request_queue *q, int force)

{

	struct cfq_data *cfqd = q->elevator->elevator_data;

	struct cfq_queue *cfqq;

	unsigned int max_dispatch;



	if (!cfqd->busy_queues)

		return 0;



	if (unlikely(force))

		return cfq_forced_dispatch(cfqd);



	cfqq = cfq_select_queue(cfqd);

	if (!cfqq)

		return 0;



	/*

	 * Drain async requests before we start sync IO

	 */

	if (cfq_cfqq_idle_window(cfqq) && cfqd->rq_in_driver[BLK_RW_ASYNC])

		return 0;

		return false;



	/*

	 * If this is an async queue and we have sync IO in flight, let it wait

	 */

	if (cfqd->sync_flight && !cfq_cfqq_sync(cfqq))

		return 0;

		return false;



	max_dispatch = cfqd->cfq_quantum;

	if (cfq_class_idle(cfqq))
@@ -1322,13 +1284,13 @@ static int cfq_dispatch_requests(struct request_queue *q, int force) 
		 * idle queue must always only have a single IO in flight

		 */

		if (cfq_class_idle(cfqq))

			return 0;

			return false;



		/*

		 * We have other queues, don't allow more IO from this one

		 */

		if (cfqd->busy_queues > 1)

			return 0;

			return false;



		/*

		 * Sole queue user, allow bigger slice
@@ -1352,13 +1314,72 @@ static int cfq_dispatch_requests(struct request_queue *q, int force) 
			max_dispatch = depth;

	}



	if (cfqq->dispatched >= max_dispatch)

	/*

	 * If we're below the current max, allow a dispatch

	 */

	return cfqq->dispatched < max_dispatch;

}



/*

 * Dispatch a request from cfqq, moving them to the request queue

 * dispatch list.

 */

static bool cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq)

{

	struct request *rq;



	BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list));



	if (!cfq_may_dispatch(cfqd, cfqq))

		return false;



	/*

	 * follow expired path, else get first next available

	 */

	rq = cfq_check_fifo(cfqq);

	if (!rq)

		rq = cfqq->next_rq;



	/*

	 * insert request into driver dispatch list

	 */

	cfq_dispatch_insert(cfqd->queue, rq);



	if (!cfqd->active_cic) {

		struct cfq_io_context *cic = RQ_CIC(rq);



		atomic_long_inc(&cic->ioc->refcount);

		cfqd->active_cic = cic;

	}



	return true;

}



/*

 * Find the cfqq that we need to service and move a request from that to the

 * dispatch list

 */

static int cfq_dispatch_requests(struct request_queue *q, int force)

{

	struct cfq_data *cfqd = q->elevator->elevator_data;

	struct cfq_queue *cfqq;



	if (!cfqd->busy_queues)

		return 0;



	if (unlikely(force))

		return cfq_forced_dispatch(cfqd);



	cfqq = cfq_select_queue(cfqd);

	if (!cfqq)

		return 0;



	/*

	 * Dispatch a request from this cfqq

	 * Dispatch a request from this cfqq, if it is allowed

	 */

	cfq_dispatch_request(cfqd, cfqq);

	if (!cfq_dispatch_request(cfqd, cfqq))

		return 0;



	cfqq->slice_dispatch++;

	cfq_clear_cfqq_must_dispatch(cfqq);
@@ -1399,7 +1420,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq) 


	if (unlikely(cfqd->active_queue == cfqq)) {

		__cfq_slice_expired(cfqd, cfqq, 0);

		cfq_schedule_dispatch(cfqd, 0);

		cfq_schedule_dispatch(cfqd);

	}



	kmem_cache_free(cfq_pool, cfqq);
@@ -1494,7 +1515,7 @@ static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) 
{

	if (unlikely(cfqq == cfqd->active_queue)) {

		__cfq_slice_expired(cfqd, cfqq, 0);

		cfq_schedule_dispatch(cfqd, 0);

		cfq_schedule_dispatch(cfqd);

	}



	cfq_put_queue(cfqq);
@@ -1658,7 +1679,7 @@ static void cfq_ioc_set_ioprio(struct io_context *ioc) 
}



static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,

			  pid_t pid, int is_sync)

			  pid_t pid, bool is_sync)

{

	RB_CLEAR_NODE(&cfqq->rb_node);

	RB_CLEAR_NODE(&cfqq->p_node);
@@ -1678,7 +1699,7 @@ static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
}



static struct cfq_queue *

cfq_find_alloc_queue(struct cfq_data *cfqd, int is_sync,

cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,

		     struct io_context *ioc, gfp_t gfp_mask)

{

	struct cfq_queue *cfqq, *new_cfqq = NULL;
@@ -1742,7 +1763,7 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) 
}



static struct cfq_queue *

cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct io_context *ioc,

cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,

	      gfp_t gfp_mask)

{

	const int ioprio = task_ioprio(ioc);
@@ -1977,7 +1998,10 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
	    (!cfqd->cfq_latency && cfqd->hw_tag && CIC_SEEKY(cic)))

		enable_idle = 0;

	else if (sample_valid(cic->ttime_samples)) {

		if (cic->ttime_mean > cfqd->cfq_slice_idle)

		unsigned int slice_idle = cfqd->cfq_slice_idle;

		if (sample_valid(cic->seek_samples) && CIC_SEEKY(cic))

			slice_idle = msecs_to_jiffies(CFQ_MIN_TT);

		if (cic->ttime_mean > slice_idle)

			enable_idle = 0;

		else

			enable_idle = 1;
@@ -1996,7 +2020,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, 
 * Check if new_cfqq should preempt the currently active queue. Return 0 for

 * no or if we aren't sure, a 1 will cause a preempt.

 */

static int

static bool

cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,

		   struct request *rq)

{
@@ -2004,48 +2028,48 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, 


	cfqq = cfqd->active_queue;

	if (!cfqq)

		return 0;

		return false;



	if (cfq_slice_used(cfqq))

		return 1;

		return true;



	if (cfq_class_idle(new_cfqq))

		return 0;

		return false;



	if (cfq_class_idle(cfqq))

		return 1;

		return true;



	/*

	 * if the new request is sync, but the currently running queue is

	 * not, let the sync request have priority.

	 */

	if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq))

		return 1;

		return true;



	/*

	 * So both queues are sync. Let the new request get disk time if

	 * it's a metadata request and the current queue is doing regular IO.

	 */

	if (rq_is_meta(rq) && !cfqq->meta_pending)

		return 1;

		return false;



	/*

	 * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice.

	 */

	if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq))

		return 1;

		return true;



	if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq))

		return 0;

		return false;



	/*

	 * if this request is as-good as one we would expect from the

	 * current cfqq, let it preempt

	 */

	if (cfq_rq_close(cfqd, rq))

		return 1;

		return true;



	return 0;

	return false;

}



/*
@@ -2130,6 +2154,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq) 


	cfq_add_rq_rb(rq);



	rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);

	list_add_tail(&rq->queuelist, &cfqq->fifo);



	cfq_rq_enqueued(cfqd, cfqq, rq);
@@ -2211,7 +2236,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) 
	}



	if (!rq_in_driver(cfqd))

		cfq_schedule_dispatch(cfqd, 0);

		cfq_schedule_dispatch(cfqd);

}



/*
@@ -2309,7 +2334,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask) 
	struct cfq_data *cfqd = q->elevator->elevator_data;

	struct cfq_io_context *cic;

	const int rw = rq_data_dir(rq);

	const int is_sync = rq_is_sync(rq);

	const bool is_sync = rq_is_sync(rq);

	struct cfq_queue *cfqq;

	unsigned long flags;
@@ -2341,7 +2366,7 @@ queue_fail: 
	if (cic)

		put_io_context(cic->ioc);



	cfq_schedule_dispatch(cfqd, 0);

	cfq_schedule_dispatch(cfqd);

	spin_unlock_irqrestore(q->queue_lock, flags);

	cfq_log(cfqd, "set_request fail");

	return 1;
@@ -2350,7 +2375,7 @@ queue_fail: 
static void cfq_kick_queue(struct work_struct *work)

{

	struct cfq_data *cfqd =

		container_of(work, struct cfq_data, unplug_work.work);

		container_of(work, struct cfq_data, unplug_work);

	struct request_queue *q = cfqd->queue;



	spin_lock_irq(q->queue_lock);
@@ -2404,7 +2429,7 @@ static void cfq_idle_slice_timer(unsigned long data) 
expire:

	cfq_slice_expired(cfqd, timed_out);

out_kick:

	cfq_schedule_dispatch(cfqd, 0);

	cfq_schedule_dispatch(cfqd);

out_cont:

	spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);

}
@@ -2412,7 +2437,7 @@ out_cont: 
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd)

{

	del_timer_sync(&cfqd->idle_slice_timer);

	cancel_delayed_work_sync(&cfqd->unplug_work);

	cancel_work_sync(&cfqd->unplug_work);

}



static void cfq_put_async_queues(struct cfq_data *cfqd)
@@ -2494,7 +2519,7 @@ static void *cfq_init_queue(struct request_queue *q) 
	cfqd->idle_slice_timer.function = cfq_idle_slice_timer;

	cfqd->idle_slice_timer.data = (unsigned long) cfqd;



	INIT_DELAYED_WORK(&cfqd->unplug_work, cfq_kick_queue);

	INIT_WORK(&cfqd->unplug_work, cfq_kick_queue);



	cfqd->cfq_quantum = cfq_quantum;

	cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0];

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