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block/mq-deadline: Add I/O priority support
Maintain one dispatch list and one FIFO list per I/O priority class: RT, BE and IDLE. Maintain statistics for each priority level. Split the debugfs attributes per priority level as follows: $ ls /sys/kernel/debug/block/.../sched/ async_depth dispatch2 read_next_rq write2_fifo_list batching read0_fifo_list starved write_next_rq dispatch0 read1_fifo_list write0_fifo_list dispatch1 read2_fifo_list write1_fifo_list Cc: Damien Le Moal <damien.lemoal@wdc.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20210618004456.7280-14-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
Jens Axboe
parent
d672d325b1
commit
c807ab520f
@ -42,23 +42,36 @@ enum dd_data_dir {
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enum { DD_DIR_COUNT = 2 };
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enum dd_prio {
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DD_RT_PRIO = 0,
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DD_BE_PRIO = 1,
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DD_IDLE_PRIO = 2,
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DD_PRIO_MAX = 2,
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};
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enum { DD_PRIO_COUNT = 3 };
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/*
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* Deadline scheduler data per I/O priority (enum dd_prio). Requests are
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* present on both sort_list[] and fifo_list[].
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*/
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struct dd_per_prio {
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struct list_head dispatch;
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struct rb_root sort_list[DD_DIR_COUNT];
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struct list_head fifo_list[DD_DIR_COUNT];
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/* Next request in FIFO order. Read, write or both are NULL. */
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struct request *next_rq[DD_DIR_COUNT];
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};
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struct deadline_data {
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/*
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* run time data
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*/
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/*
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* requests (deadline_rq s) are present on both sort_list and fifo_list
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*/
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struct rb_root sort_list[DD_DIR_COUNT];
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struct list_head fifo_list[DD_DIR_COUNT];
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struct dd_per_prio per_prio[DD_PRIO_COUNT];
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/* Data direction of latest dispatched request. */
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enum dd_data_dir last_dir;
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/*
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* next in sort order. read, write or both are NULL
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*/
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struct request *next_rq[DD_DIR_COUNT];
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unsigned int batching; /* number of sequential requests made */
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unsigned int starved; /* times reads have starved writes */
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@ -73,13 +86,29 @@ struct deadline_data {
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spinlock_t lock;
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spinlock_t zone_lock;
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struct list_head dispatch;
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};
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/* Maps an I/O priority class to a deadline scheduler priority. */
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static const enum dd_prio ioprio_class_to_prio[] = {
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[IOPRIO_CLASS_NONE] = DD_BE_PRIO,
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[IOPRIO_CLASS_RT] = DD_RT_PRIO,
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[IOPRIO_CLASS_BE] = DD_BE_PRIO,
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[IOPRIO_CLASS_IDLE] = DD_IDLE_PRIO,
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};
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static inline struct rb_root *
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deadline_rb_root(struct deadline_data *dd, struct request *rq)
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deadline_rb_root(struct dd_per_prio *per_prio, struct request *rq)
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{
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return &dd->sort_list[rq_data_dir(rq)];
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return &per_prio->sort_list[rq_data_dir(rq)];
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}
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/*
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* Returns the I/O priority class (IOPRIO_CLASS_*) that has been assigned to a
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* request.
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*/
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static u8 dd_rq_ioclass(struct request *rq)
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{
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return IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
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}
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/*
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@ -97,38 +126,38 @@ deadline_latter_request(struct request *rq)
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}
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static void
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deadline_add_rq_rb(struct deadline_data *dd, struct request *rq)
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deadline_add_rq_rb(struct dd_per_prio *per_prio, struct request *rq)
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{
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struct rb_root *root = deadline_rb_root(dd, rq);
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struct rb_root *root = deadline_rb_root(per_prio, rq);
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elv_rb_add(root, rq);
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}
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static inline void
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deadline_del_rq_rb(struct deadline_data *dd, struct request *rq)
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deadline_del_rq_rb(struct dd_per_prio *per_prio, struct request *rq)
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{
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const enum dd_data_dir data_dir = rq_data_dir(rq);
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if (dd->next_rq[data_dir] == rq)
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dd->next_rq[data_dir] = deadline_latter_request(rq);
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if (per_prio->next_rq[data_dir] == rq)
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per_prio->next_rq[data_dir] = deadline_latter_request(rq);
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elv_rb_del(deadline_rb_root(dd, rq), rq);
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elv_rb_del(deadline_rb_root(per_prio, rq), rq);
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}
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/*
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* remove rq from rbtree and fifo.
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*/
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static void deadline_remove_request(struct request_queue *q, struct request *rq)
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static void deadline_remove_request(struct request_queue *q,
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struct dd_per_prio *per_prio,
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struct request *rq)
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{
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struct deadline_data *dd = q->elevator->elevator_data;
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list_del_init(&rq->queuelist);
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/*
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* We might not be on the rbtree, if we are doing an insert merge
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*/
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if (!RB_EMPTY_NODE(&rq->rb_node))
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deadline_del_rq_rb(dd, rq);
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deadline_del_rq_rb(per_prio, rq);
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elv_rqhash_del(q, rq);
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if (q->last_merge == rq)
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@ -139,13 +168,16 @@ static void dd_request_merged(struct request_queue *q, struct request *req,
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enum elv_merge type)
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{
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struct deadline_data *dd = q->elevator->elevator_data;
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const u8 ioprio_class = dd_rq_ioclass(req);
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const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
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struct dd_per_prio *per_prio = &dd->per_prio[prio];
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/*
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* if the merge was a front merge, we need to reposition request
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*/
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if (type == ELEVATOR_FRONT_MERGE) {
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elv_rb_del(deadline_rb_root(dd, req), req);
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deadline_add_rq_rb(dd, req);
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elv_rb_del(deadline_rb_root(per_prio, req), req);
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deadline_add_rq_rb(per_prio, req);
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}
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}
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@ -155,6 +187,9 @@ static void dd_request_merged(struct request_queue *q, struct request *req,
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static void dd_merged_requests(struct request_queue *q, struct request *req,
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struct request *next)
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{
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const u8 ioprio_class = dd_rq_ioclass(next);
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const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
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/*
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* if next expires before rq, assign its expire time to rq
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* and move into next position (next will be deleted) in fifo
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@ -170,33 +205,34 @@ static void dd_merged_requests(struct request_queue *q, struct request *req,
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/*
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* kill knowledge of next, this one is a goner
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*/
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deadline_remove_request(q, next);
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deadline_remove_request(q, &dd->per_prio[prio], next);
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}
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/*
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* move an entry to dispatch queue
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*/
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static void
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deadline_move_request(struct deadline_data *dd, struct request *rq)
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deadline_move_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
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struct request *rq)
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{
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const enum dd_data_dir data_dir = rq_data_dir(rq);
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dd->next_rq[data_dir] = deadline_latter_request(rq);
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per_prio->next_rq[data_dir] = deadline_latter_request(rq);
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/*
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* take it off the sort and fifo list
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*/
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deadline_remove_request(rq->q, rq);
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deadline_remove_request(rq->q, per_prio, rq);
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}
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/*
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* deadline_check_fifo returns 0 if there are no expired requests on the fifo,
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* 1 otherwise. Requires !list_empty(&dd->fifo_list[data_dir])
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*/
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static inline int deadline_check_fifo(struct deadline_data *dd,
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static inline int deadline_check_fifo(struct dd_per_prio *per_prio,
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enum dd_data_dir data_dir)
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{
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struct request *rq = rq_entry_fifo(dd->fifo_list[data_dir].next);
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struct request *rq = rq_entry_fifo(per_prio->fifo_list[data_dir].next);
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/*
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* rq is expired!
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@ -212,15 +248,16 @@ static inline int deadline_check_fifo(struct deadline_data *dd,
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* dispatch using arrival ordered lists.
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*/
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static struct request *
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deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
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deadline_fifo_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
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enum dd_data_dir data_dir)
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{
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struct request *rq;
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unsigned long flags;
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if (list_empty(&dd->fifo_list[data_dir]))
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if (list_empty(&per_prio->fifo_list[data_dir]))
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return NULL;
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rq = rq_entry_fifo(dd->fifo_list[data_dir].next);
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rq = rq_entry_fifo(per_prio->fifo_list[data_dir].next);
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if (data_dir == DD_READ || !blk_queue_is_zoned(rq->q))
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return rq;
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@ -229,7 +266,7 @@ deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
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* an unlocked target zone.
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*/
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spin_lock_irqsave(&dd->zone_lock, flags);
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list_for_each_entry(rq, &dd->fifo_list[DD_WRITE], queuelist) {
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list_for_each_entry(rq, &per_prio->fifo_list[DD_WRITE], queuelist) {
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if (blk_req_can_dispatch_to_zone(rq))
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goto out;
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}
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@ -245,12 +282,13 @@ deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
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* dispatch using sector position sorted lists.
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*/
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static struct request *
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deadline_next_request(struct deadline_data *dd, enum dd_data_dir data_dir)
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deadline_next_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
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enum dd_data_dir data_dir)
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{
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struct request *rq;
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unsigned long flags;
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rq = dd->next_rq[data_dir];
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rq = per_prio->next_rq[data_dir];
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if (!rq)
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return NULL;
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@ -276,15 +314,17 @@ deadline_next_request(struct deadline_data *dd, enum dd_data_dir data_dir)
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* deadline_dispatch_requests selects the best request according to
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* read/write expire, fifo_batch, etc
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*/
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static struct request *__dd_dispatch_request(struct deadline_data *dd)
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static struct request *__dd_dispatch_request(struct deadline_data *dd,
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struct dd_per_prio *per_prio)
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{
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struct request *rq, *next_rq;
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enum dd_data_dir data_dir;
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lockdep_assert_held(&dd->lock);
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if (!list_empty(&dd->dispatch)) {
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rq = list_first_entry(&dd->dispatch, struct request, queuelist);
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if (!list_empty(&per_prio->dispatch)) {
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rq = list_first_entry(&per_prio->dispatch, struct request,
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queuelist);
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list_del_init(&rq->queuelist);
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goto done;
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}
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@ -292,7 +332,7 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
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/*
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* batches are currently reads XOR writes
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*/
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rq = deadline_next_request(dd, dd->last_dir);
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rq = deadline_next_request(dd, per_prio, dd->last_dir);
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if (rq && dd->batching < dd->fifo_batch)
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/* we have a next request are still entitled to batch */
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goto dispatch_request;
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@ -302,10 +342,10 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
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* data direction (read / write)
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*/
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if (!list_empty(&dd->fifo_list[DD_READ])) {
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BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[DD_READ]));
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if (!list_empty(&per_prio->fifo_list[DD_READ])) {
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BUG_ON(RB_EMPTY_ROOT(&per_prio->sort_list[DD_READ]));
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if (deadline_fifo_request(dd, DD_WRITE) &&
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if (deadline_fifo_request(dd, per_prio, DD_WRITE) &&
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(dd->starved++ >= dd->writes_starved))
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goto dispatch_writes;
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@ -318,9 +358,9 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
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* there are either no reads or writes have been starved
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*/
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if (!list_empty(&dd->fifo_list[DD_WRITE])) {
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if (!list_empty(&per_prio->fifo_list[DD_WRITE])) {
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dispatch_writes:
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BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[DD_WRITE]));
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BUG_ON(RB_EMPTY_ROOT(&per_prio->sort_list[DD_WRITE]));
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dd->starved = 0;
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@ -335,14 +375,14 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
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/*
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* we are not running a batch, find best request for selected data_dir
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*/
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next_rq = deadline_next_request(dd, data_dir);
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if (deadline_check_fifo(dd, data_dir) || !next_rq) {
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next_rq = deadline_next_request(dd, per_prio, data_dir);
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if (deadline_check_fifo(per_prio, data_dir) || !next_rq) {
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/*
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* A deadline has expired, the last request was in the other
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* direction, or we have run out of higher-sectored requests.
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* Start again from the request with the earliest expiry time.
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*/
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rq = deadline_fifo_request(dd, data_dir);
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rq = deadline_fifo_request(dd, per_prio, data_dir);
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} else {
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/*
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* The last req was the same dir and we have a next request in
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@ -366,7 +406,7 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
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* rq is the selected appropriate request.
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*/
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dd->batching++;
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deadline_move_request(dd, rq);
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deadline_move_request(dd, per_prio, rq);
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done:
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/*
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* If the request needs its target zone locked, do it.
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@ -388,9 +428,14 @@ static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx)
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{
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struct deadline_data *dd = hctx->queue->elevator->elevator_data;
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struct request *rq;
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enum dd_prio prio;
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spin_lock(&dd->lock);
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rq = __dd_dispatch_request(dd);
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for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
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rq = __dd_dispatch_request(dd, &dd->per_prio[prio]);
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if (rq)
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break;
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}
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spin_unlock(&dd->lock);
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return rq;
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@ -437,9 +482,14 @@ static int dd_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
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static void dd_exit_sched(struct elevator_queue *e)
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{
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struct deadline_data *dd = e->elevator_data;
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enum dd_prio prio;
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BUG_ON(!list_empty(&dd->fifo_list[DD_READ]));
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BUG_ON(!list_empty(&dd->fifo_list[DD_WRITE]));
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for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
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struct dd_per_prio *per_prio = &dd->per_prio[prio];
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WARN_ON_ONCE(!list_empty(&per_prio->fifo_list[DD_READ]));
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WARN_ON_ONCE(!list_empty(&per_prio->fifo_list[DD_WRITE]));
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}
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kfree(dd);
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}
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@ -451,22 +501,28 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
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{
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struct deadline_data *dd;
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struct elevator_queue *eq;
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enum dd_prio prio;
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int ret = -ENOMEM;
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eq = elevator_alloc(q, e);
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if (!eq)
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return -ENOMEM;
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return ret;
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dd = kzalloc_node(sizeof(*dd), GFP_KERNEL, q->node);
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if (!dd) {
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kobject_put(&eq->kobj);
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return -ENOMEM;
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}
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if (!dd)
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goto put_eq;
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eq->elevator_data = dd;
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INIT_LIST_HEAD(&dd->fifo_list[DD_READ]);
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INIT_LIST_HEAD(&dd->fifo_list[DD_WRITE]);
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dd->sort_list[DD_READ] = RB_ROOT;
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dd->sort_list[DD_WRITE] = RB_ROOT;
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for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
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struct dd_per_prio *per_prio = &dd->per_prio[prio];
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INIT_LIST_HEAD(&per_prio->dispatch);
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INIT_LIST_HEAD(&per_prio->fifo_list[DD_READ]);
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INIT_LIST_HEAD(&per_prio->fifo_list[DD_WRITE]);
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per_prio->sort_list[DD_READ] = RB_ROOT;
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per_prio->sort_list[DD_WRITE] = RB_ROOT;
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}
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dd->fifo_expire[DD_READ] = read_expire;
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dd->fifo_expire[DD_WRITE] = write_expire;
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dd->writes_starved = writes_starved;
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@ -475,10 +531,13 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
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dd->fifo_batch = fifo_batch;
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spin_lock_init(&dd->lock);
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spin_lock_init(&dd->zone_lock);
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INIT_LIST_HEAD(&dd->dispatch);
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||||
|
||||
q->elevator = eq;
|
||||
return 0;
|
||||
|
||||
put_eq:
|
||||
kobject_put(&eq->kobj);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -489,13 +548,16 @@ static int dd_request_merge(struct request_queue *q, struct request **rq,
|
||||
struct bio *bio)
|
||||
{
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
const u8 ioprio_class = IOPRIO_PRIO_CLASS(bio->bi_ioprio);
|
||||
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio];
|
||||
sector_t sector = bio_end_sector(bio);
|
||||
struct request *__rq;
|
||||
|
||||
if (!dd->front_merges)
|
||||
return ELEVATOR_NO_MERGE;
|
||||
|
||||
__rq = elv_rb_find(&dd->sort_list[bio_data_dir(bio)], sector);
|
||||
__rq = elv_rb_find(&per_prio->sort_list[bio_data_dir(bio)], sector);
|
||||
if (__rq) {
|
||||
BUG_ON(sector != blk_rq_pos(__rq));
|
||||
|
||||
@ -538,6 +600,10 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
|
||||
struct request_queue *q = hctx->queue;
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
const enum dd_data_dir data_dir = rq_data_dir(rq);
|
||||
u16 ioprio = req_get_ioprio(rq);
|
||||
u8 ioprio_class = IOPRIO_PRIO_CLASS(ioprio);
|
||||
struct dd_per_prio *per_prio;
|
||||
enum dd_prio prio;
|
||||
|
||||
lockdep_assert_held(&dd->lock);
|
||||
|
||||
@ -547,15 +613,18 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
|
||||
*/
|
||||
blk_req_zone_write_unlock(rq);
|
||||
|
||||
prio = ioprio_class_to_prio[ioprio_class];
|
||||
|
||||
if (blk_mq_sched_try_insert_merge(q, rq))
|
||||
return;
|
||||
|
||||
trace_block_rq_insert(rq);
|
||||
|
||||
per_prio = &dd->per_prio[prio];
|
||||
if (at_head) {
|
||||
list_add(&rq->queuelist, &dd->dispatch);
|
||||
list_add(&rq->queuelist, &per_prio->dispatch);
|
||||
} else {
|
||||
deadline_add_rq_rb(dd, rq);
|
||||
deadline_add_rq_rb(per_prio, rq);
|
||||
|
||||
if (rq_mergeable(rq)) {
|
||||
elv_rqhash_add(q, rq);
|
||||
@ -567,7 +636,7 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
|
||||
* set expire time and add to fifo list
|
||||
*/
|
||||
rq->fifo_time = jiffies + dd->fifo_expire[data_dir];
|
||||
list_add_tail(&rq->queuelist, &dd->fifo_list[data_dir]);
|
||||
list_add_tail(&rq->queuelist, &per_prio->fifo_list[data_dir]);
|
||||
}
|
||||
}
|
||||
|
||||
@ -618,26 +687,39 @@ static void dd_prepare_request(struct request *rq)
|
||||
static void dd_finish_request(struct request *rq)
|
||||
{
|
||||
struct request_queue *q = rq->q;
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
const u8 ioprio_class = dd_rq_ioclass(rq);
|
||||
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio];
|
||||
|
||||
if (blk_queue_is_zoned(q)) {
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&dd->zone_lock, flags);
|
||||
blk_req_zone_write_unlock(rq);
|
||||
if (!list_empty(&dd->fifo_list[DD_WRITE]))
|
||||
if (!list_empty(&per_prio->fifo_list[DD_WRITE]))
|
||||
blk_mq_sched_mark_restart_hctx(rq->mq_hctx);
|
||||
spin_unlock_irqrestore(&dd->zone_lock, flags);
|
||||
}
|
||||
}
|
||||
|
||||
static bool dd_has_work_for_prio(struct dd_per_prio *per_prio)
|
||||
{
|
||||
return !list_empty_careful(&per_prio->dispatch) ||
|
||||
!list_empty_careful(&per_prio->fifo_list[DD_READ]) ||
|
||||
!list_empty_careful(&per_prio->fifo_list[DD_WRITE]);
|
||||
}
|
||||
|
||||
static bool dd_has_work(struct blk_mq_hw_ctx *hctx)
|
||||
{
|
||||
struct deadline_data *dd = hctx->queue->elevator->elevator_data;
|
||||
enum dd_prio prio;
|
||||
|
||||
return !list_empty_careful(&dd->dispatch) ||
|
||||
!list_empty_careful(&dd->fifo_list[0]) ||
|
||||
!list_empty_careful(&dd->fifo_list[1]);
|
||||
for (prio = 0; prio <= DD_PRIO_MAX; prio++)
|
||||
if (dd_has_work_for_prio(&dd->per_prio[prio]))
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -704,16 +786,17 @@ static struct elv_fs_entry deadline_attrs[] = {
|
||||
};
|
||||
|
||||
#ifdef CONFIG_BLK_DEBUG_FS
|
||||
#define DEADLINE_DEBUGFS_DDIR_ATTRS(ddir, name) \
|
||||
#define DEADLINE_DEBUGFS_DDIR_ATTRS(prio, data_dir, name) \
|
||||
static void *deadline_##name##_fifo_start(struct seq_file *m, \
|
||||
loff_t *pos) \
|
||||
__acquires(&dd->lock) \
|
||||
{ \
|
||||
struct request_queue *q = m->private; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio]; \
|
||||
\
|
||||
spin_lock(&dd->lock); \
|
||||
return seq_list_start(&dd->fifo_list[ddir], *pos); \
|
||||
return seq_list_start(&per_prio->fifo_list[data_dir], *pos); \
|
||||
} \
|
||||
\
|
||||
static void *deadline_##name##_fifo_next(struct seq_file *m, void *v, \
|
||||
@ -721,8 +804,9 @@ static void *deadline_##name##_fifo_next(struct seq_file *m, void *v, \
|
||||
{ \
|
||||
struct request_queue *q = m->private; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio]; \
|
||||
\
|
||||
return seq_list_next(v, &dd->fifo_list[ddir], pos); \
|
||||
return seq_list_next(v, &per_prio->fifo_list[data_dir], pos); \
|
||||
} \
|
||||
\
|
||||
static void deadline_##name##_fifo_stop(struct seq_file *m, void *v) \
|
||||
@ -746,14 +830,20 @@ static int deadline_##name##_next_rq_show(void *data, \
|
||||
{ \
|
||||
struct request_queue *q = data; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
struct request *rq = dd->next_rq[ddir]; \
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio]; \
|
||||
struct request *rq = per_prio->next_rq[data_dir]; \
|
||||
\
|
||||
if (rq) \
|
||||
__blk_mq_debugfs_rq_show(m, rq); \
|
||||
return 0; \
|
||||
}
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_READ, read)
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_WRITE, write)
|
||||
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_RT_PRIO, DD_READ, read0);
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_RT_PRIO, DD_WRITE, write0);
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_BE_PRIO, DD_READ, read1);
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_BE_PRIO, DD_WRITE, write1);
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_IDLE_PRIO, DD_READ, read2);
|
||||
DEADLINE_DEBUGFS_DDIR_ATTRS(DD_IDLE_PRIO, DD_WRITE, write2);
|
||||
#undef DEADLINE_DEBUGFS_DDIR_ATTRS
|
||||
|
||||
static int deadline_batching_show(void *data, struct seq_file *m)
|
||||
@ -783,50 +873,74 @@ static int dd_async_depth_show(void *data, struct seq_file *m)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void *deadline_dispatch_start(struct seq_file *m, loff_t *pos)
|
||||
__acquires(&dd->lock)
|
||||
{
|
||||
struct request_queue *q = m->private;
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
|
||||
spin_lock(&dd->lock);
|
||||
return seq_list_start(&dd->dispatch, *pos);
|
||||
#define DEADLINE_DISPATCH_ATTR(prio) \
|
||||
static void *deadline_dispatch##prio##_start(struct seq_file *m, \
|
||||
loff_t *pos) \
|
||||
__acquires(&dd->lock) \
|
||||
{ \
|
||||
struct request_queue *q = m->private; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio]; \
|
||||
\
|
||||
spin_lock(&dd->lock); \
|
||||
return seq_list_start(&per_prio->dispatch, *pos); \
|
||||
} \
|
||||
\
|
||||
static void *deadline_dispatch##prio##_next(struct seq_file *m, \
|
||||
void *v, loff_t *pos) \
|
||||
{ \
|
||||
struct request_queue *q = m->private; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
struct dd_per_prio *per_prio = &dd->per_prio[prio]; \
|
||||
\
|
||||
return seq_list_next(v, &per_prio->dispatch, pos); \
|
||||
} \
|
||||
\
|
||||
static void deadline_dispatch##prio##_stop(struct seq_file *m, void *v) \
|
||||
__releases(&dd->lock) \
|
||||
{ \
|
||||
struct request_queue *q = m->private; \
|
||||
struct deadline_data *dd = q->elevator->elevator_data; \
|
||||
\
|
||||
spin_unlock(&dd->lock); \
|
||||
} \
|
||||
\
|
||||
static const struct seq_operations deadline_dispatch##prio##_seq_ops = { \
|
||||
.start = deadline_dispatch##prio##_start, \
|
||||
.next = deadline_dispatch##prio##_next, \
|
||||
.stop = deadline_dispatch##prio##_stop, \
|
||||
.show = blk_mq_debugfs_rq_show, \
|
||||
}
|
||||
|
||||
static void *deadline_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
|
||||
{
|
||||
struct request_queue *q = m->private;
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
DEADLINE_DISPATCH_ATTR(0);
|
||||
DEADLINE_DISPATCH_ATTR(1);
|
||||
DEADLINE_DISPATCH_ATTR(2);
|
||||
#undef DEADLINE_DISPATCH_ATTR
|
||||
|
||||
return seq_list_next(v, &dd->dispatch, pos);
|
||||
}
|
||||
|
||||
static void deadline_dispatch_stop(struct seq_file *m, void *v)
|
||||
__releases(&dd->lock)
|
||||
{
|
||||
struct request_queue *q = m->private;
|
||||
struct deadline_data *dd = q->elevator->elevator_data;
|
||||
|
||||
spin_unlock(&dd->lock);
|
||||
}
|
||||
|
||||
static const struct seq_operations deadline_dispatch_seq_ops = {
|
||||
.start = deadline_dispatch_start,
|
||||
.next = deadline_dispatch_next,
|
||||
.stop = deadline_dispatch_stop,
|
||||
.show = blk_mq_debugfs_rq_show,
|
||||
};
|
||||
|
||||
#define DEADLINE_QUEUE_DDIR_ATTRS(name) \
|
||||
{#name "_fifo_list", 0400, .seq_ops = &deadline_##name##_fifo_seq_ops}, \
|
||||
#define DEADLINE_QUEUE_DDIR_ATTRS(name) \
|
||||
{#name "_fifo_list", 0400, \
|
||||
.seq_ops = &deadline_##name##_fifo_seq_ops}
|
||||
#define DEADLINE_NEXT_RQ_ATTR(name) \
|
||||
{#name "_next_rq", 0400, deadline_##name##_next_rq_show}
|
||||
static const struct blk_mq_debugfs_attr deadline_queue_debugfs_attrs[] = {
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(read),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(write),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(read0),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(write0),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(read1),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(write1),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(read2),
|
||||
DEADLINE_QUEUE_DDIR_ATTRS(write2),
|
||||
DEADLINE_NEXT_RQ_ATTR(read0),
|
||||
DEADLINE_NEXT_RQ_ATTR(write0),
|
||||
DEADLINE_NEXT_RQ_ATTR(read1),
|
||||
DEADLINE_NEXT_RQ_ATTR(write1),
|
||||
DEADLINE_NEXT_RQ_ATTR(read2),
|
||||
DEADLINE_NEXT_RQ_ATTR(write2),
|
||||
{"batching", 0400, deadline_batching_show},
|
||||
{"starved", 0400, deadline_starved_show},
|
||||
{"async_depth", 0400, dd_async_depth_show},
|
||||
{"dispatch", 0400, .seq_ops = &deadline_dispatch_seq_ops},
|
||||
{"dispatch0", 0400, .seq_ops = &deadline_dispatch0_seq_ops},
|
||||
{"dispatch1", 0400, .seq_ops = &deadline_dispatch1_seq_ops},
|
||||
{"dispatch2", 0400, .seq_ops = &deadline_dispatch2_seq_ops},
|
||||
{},
|
||||
};
|
||||
#undef DEADLINE_QUEUE_DDIR_ATTRS
|
||||
@ -876,6 +990,6 @@ static void __exit deadline_exit(void)
|
||||
module_init(deadline_init);
|
||||
module_exit(deadline_exit);
|
||||
|
||||
MODULE_AUTHOR("Jens Axboe");
|
||||
MODULE_AUTHOR("Jens Axboe, Damien Le Moal and Bart Van Assche");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("MQ deadline IO scheduler");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user