Commit c807ab52 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe

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: default avatarBart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20210618004456.7280-14-bvanassche@acm.orgSigned-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent d672d325
......@@ -42,23 +42,36 @@ enum dd_data_dir {
enum { DD_DIR_COUNT = 2 };
enum dd_prio {
DD_RT_PRIO = 0,
DD_BE_PRIO = 1,
DD_IDLE_PRIO = 2,
DD_PRIO_MAX = 2,
};
enum { DD_PRIO_COUNT = 3 };
/*
* Deadline scheduler data per I/O priority (enum dd_prio). Requests are
* present on both sort_list[] and fifo_list[].
*/
struct dd_per_prio {
struct list_head dispatch;
struct rb_root sort_list[DD_DIR_COUNT];
struct list_head fifo_list[DD_DIR_COUNT];
/* Next request in FIFO order. Read, write or both are NULL. */
struct request *next_rq[DD_DIR_COUNT];
};
struct deadline_data {
/*
* run time data
*/
/*
* requests (deadline_rq s) are present on both sort_list and fifo_list
*/
struct rb_root sort_list[DD_DIR_COUNT];
struct list_head fifo_list[DD_DIR_COUNT];
struct dd_per_prio per_prio[DD_PRIO_COUNT];
/* Data direction of latest dispatched request. */
enum dd_data_dir last_dir;
/*
* next in sort order. read, write or both are NULL
*/
struct request *next_rq[DD_DIR_COUNT];
unsigned int batching; /* number of sequential requests made */
unsigned int starved; /* times reads have starved writes */
......@@ -73,13 +86,29 @@ struct deadline_data {
spinlock_t lock;
spinlock_t zone_lock;
struct list_head dispatch;
};
/* Maps an I/O priority class to a deadline scheduler priority. */
static const enum dd_prio ioprio_class_to_prio[] = {
[IOPRIO_CLASS_NONE] = DD_BE_PRIO,
[IOPRIO_CLASS_RT] = DD_RT_PRIO,
[IOPRIO_CLASS_BE] = DD_BE_PRIO,
[IOPRIO_CLASS_IDLE] = DD_IDLE_PRIO,
};
static inline struct rb_root *
deadline_rb_root(struct deadline_data *dd, struct request *rq)
deadline_rb_root(struct dd_per_prio *per_prio, struct request *rq)
{
return &dd->sort_list[rq_data_dir(rq)];
return &per_prio->sort_list[rq_data_dir(rq)];
}
/*
* Returns the I/O priority class (IOPRIO_CLASS_*) that has been assigned to a
* request.
*/
static u8 dd_rq_ioclass(struct request *rq)
{
return IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
}
/*
......@@ -97,38 +126,38 @@ deadline_latter_request(struct request *rq)
}
static void
deadline_add_rq_rb(struct deadline_data *dd, struct request *rq)
deadline_add_rq_rb(struct dd_per_prio *per_prio, struct request *rq)
{
struct rb_root *root = deadline_rb_root(dd, rq);
struct rb_root *root = deadline_rb_root(per_prio, rq);
elv_rb_add(root, rq);
}
static inline void
deadline_del_rq_rb(struct deadline_data *dd, struct request *rq)
deadline_del_rq_rb(struct dd_per_prio *per_prio, struct request *rq)
{
const enum dd_data_dir data_dir = rq_data_dir(rq);
if (dd->next_rq[data_dir] == rq)
dd->next_rq[data_dir] = deadline_latter_request(rq);
if (per_prio->next_rq[data_dir] == rq)
per_prio->next_rq[data_dir] = deadline_latter_request(rq);
elv_rb_del(deadline_rb_root(dd, rq), rq);
elv_rb_del(deadline_rb_root(per_prio, rq), rq);
}
/*
* remove rq from rbtree and fifo.
*/
static void deadline_remove_request(struct request_queue *q, struct request *rq)
static void deadline_remove_request(struct request_queue *q,
struct dd_per_prio *per_prio,
struct request *rq)
{
struct deadline_data *dd = q->elevator->elevator_data;
list_del_init(&rq->queuelist);
/*
* We might not be on the rbtree, if we are doing an insert merge
*/
if (!RB_EMPTY_NODE(&rq->rb_node))
deadline_del_rq_rb(dd, rq);
deadline_del_rq_rb(per_prio, rq);
elv_rqhash_del(q, rq);
if (q->last_merge == rq)
......@@ -139,13 +168,16 @@ static void dd_request_merged(struct request_queue *q, struct request *req,
enum elv_merge type)
{
struct deadline_data *dd = q->elevator->elevator_data;
const u8 ioprio_class = dd_rq_ioclass(req);
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
struct dd_per_prio *per_prio = &dd->per_prio[prio];
/*
* if the merge was a front merge, we need to reposition request
*/
if (type == ELEVATOR_FRONT_MERGE) {
elv_rb_del(deadline_rb_root(dd, req), req);
deadline_add_rq_rb(dd, req);
elv_rb_del(deadline_rb_root(per_prio, req), req);
deadline_add_rq_rb(per_prio, req);
}
}
......@@ -155,6 +187,9 @@ static void dd_request_merged(struct request_queue *q, struct request *req,
static void dd_merged_requests(struct request_queue *q, struct request *req,
struct request *next)
{
const u8 ioprio_class = dd_rq_ioclass(next);
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
/*
* if next expires before rq, assign its expire time to rq
* and move into next position (next will be deleted) in fifo
......@@ -170,33 +205,34 @@ static void dd_merged_requests(struct request_queue *q, struct request *req,
/*
* kill knowledge of next, this one is a goner
*/
deadline_remove_request(q, next);
deadline_remove_request(q, &dd->per_prio[prio], next);
}
/*
* move an entry to dispatch queue
*/
static void
deadline_move_request(struct deadline_data *dd, struct request *rq)
deadline_move_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
struct request *rq)
{
const enum dd_data_dir data_dir = rq_data_dir(rq);
dd->next_rq[data_dir] = deadline_latter_request(rq);
per_prio->next_rq[data_dir] = deadline_latter_request(rq);
/*
* take it off the sort and fifo list
*/
deadline_remove_request(rq->q, rq);
deadline_remove_request(rq->q, per_prio, rq);
}
/*
* deadline_check_fifo returns 0 if there are no expired requests on the fifo,
* 1 otherwise. Requires !list_empty(&dd->fifo_list[data_dir])
*/
static inline int deadline_check_fifo(struct deadline_data *dd,
static inline int deadline_check_fifo(struct dd_per_prio *per_prio,
enum dd_data_dir data_dir)
{
struct request *rq = rq_entry_fifo(dd->fifo_list[data_dir].next);
struct request *rq = rq_entry_fifo(per_prio->fifo_list[data_dir].next);
/*
* rq is expired!
......@@ -212,15 +248,16 @@ static inline int deadline_check_fifo(struct deadline_data *dd,
* dispatch using arrival ordered lists.
*/
static struct request *
deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
deadline_fifo_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
enum dd_data_dir data_dir)
{
struct request *rq;
unsigned long flags;
if (list_empty(&dd->fifo_list[data_dir]))
if (list_empty(&per_prio->fifo_list[data_dir]))
return NULL;
rq = rq_entry_fifo(dd->fifo_list[data_dir].next);
rq = rq_entry_fifo(per_prio->fifo_list[data_dir].next);
if (data_dir == DD_READ || !blk_queue_is_zoned(rq->q))
return rq;
......@@ -229,7 +266,7 @@ deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
* an unlocked target zone.
*/
spin_lock_irqsave(&dd->zone_lock, flags);
list_for_each_entry(rq, &dd->fifo_list[DD_WRITE], queuelist) {
list_for_each_entry(rq, &per_prio->fifo_list[DD_WRITE], queuelist) {
if (blk_req_can_dispatch_to_zone(rq))
goto out;
}
......@@ -245,12 +282,13 @@ deadline_fifo_request(struct deadline_data *dd, enum dd_data_dir data_dir)
* dispatch using sector position sorted lists.
*/
static struct request *
deadline_next_request(struct deadline_data *dd, enum dd_data_dir data_dir)
deadline_next_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
enum dd_data_dir data_dir)
{
struct request *rq;
unsigned long flags;
rq = dd->next_rq[data_dir];
rq = per_prio->next_rq[data_dir];
if (!rq)
return NULL;
......@@ -276,15 +314,17 @@ deadline_next_request(struct deadline_data *dd, enum dd_data_dir data_dir)
* deadline_dispatch_requests selects the best request according to
* read/write expire, fifo_batch, etc
*/
static struct request *__dd_dispatch_request(struct deadline_data *dd)
static struct request *__dd_dispatch_request(struct deadline_data *dd,
struct dd_per_prio *per_prio)
{
struct request *rq, *next_rq;
enum dd_data_dir data_dir;
lockdep_assert_held(&dd->lock);
if (!list_empty(&dd->dispatch)) {
rq = list_first_entry(&dd->dispatch, struct request, queuelist);
if (!list_empty(&per_prio->dispatch)) {
rq = list_first_entry(&per_prio->dispatch, struct request,
queuelist);
list_del_init(&rq->queuelist);
goto done;
}
......@@ -292,7 +332,7 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
/*
* batches are currently reads XOR writes
*/
rq = deadline_next_request(dd, dd->last_dir);
rq = deadline_next_request(dd, per_prio, dd->last_dir);
if (rq && dd->batching < dd->fifo_batch)
/* we have a next request are still entitled to batch */
goto dispatch_request;
......@@ -302,10 +342,10 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
* data direction (read / write)
*/
if (!list_empty(&dd->fifo_list[DD_READ])) {
BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[DD_READ]));
if (!list_empty(&per_prio->fifo_list[DD_READ])) {
BUG_ON(RB_EMPTY_ROOT(&per_prio->sort_list[DD_READ]));
if (deadline_fifo_request(dd, DD_WRITE) &&
if (deadline_fifo_request(dd, per_prio, DD_WRITE) &&
(dd->starved++ >= dd->writes_starved))
goto dispatch_writes;
......@@ -318,9 +358,9 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
* there are either no reads or writes have been starved
*/
if (!list_empty(&dd->fifo_list[DD_WRITE])) {
if (!list_empty(&per_prio->fifo_list[DD_WRITE])) {
dispatch_writes:
BUG_ON(RB_EMPTY_ROOT(&dd->sort_list[DD_WRITE]));
BUG_ON(RB_EMPTY_ROOT(&per_prio->sort_list[DD_WRITE]));
dd->starved = 0;
......@@ -335,14 +375,14 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
/*
* we are not running a batch, find best request for selected data_dir
*/
next_rq = deadline_next_request(dd, data_dir);
if (deadline_check_fifo(dd, data_dir) || !next_rq) {
next_rq = deadline_next_request(dd, per_prio, data_dir);
if (deadline_check_fifo(per_prio, data_dir) || !next_rq) {
/*
* A deadline has expired, the last request was in the other
* direction, or we have run out of higher-sectored requests.
* Start again from the request with the earliest expiry time.
*/
rq = deadline_fifo_request(dd, data_dir);
rq = deadline_fifo_request(dd, per_prio, data_dir);
} else {
/*
* The last req was the same dir and we have a next request in
......@@ -366,7 +406,7 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd)
* rq is the selected appropriate request.
*/
dd->batching++;
deadline_move_request(dd, rq);
deadline_move_request(dd, per_prio, rq);
done:
/*
* If the request needs its target zone locked, do it.
......@@ -388,9 +428,14 @@ static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx)
{
struct deadline_data *dd = hctx->queue->elevator->elevator_data;
struct request *rq;
enum dd_prio prio;
spin_lock(&dd->lock);
rq = __dd_dispatch_request(dd);
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
rq = __dd_dispatch_request(dd, &dd->per_prio[prio]);
if (rq)
break;
}
spin_unlock(&dd->lock);
return rq;
......@@ -437,9 +482,14 @@ static int dd_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
static void dd_exit_sched(struct elevator_queue *e)
{
struct deadline_data *dd = e->elevator_data;
enum dd_prio prio;
BUG_ON(!list_empty(&dd->fifo_list[DD_READ]));
BUG_ON(!list_empty(&dd->fifo_list[DD_WRITE]));
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
struct dd_per_prio *per_prio = &dd->per_prio[prio];
WARN_ON_ONCE(!list_empty(&per_prio->fifo_list[DD_READ]));
WARN_ON_ONCE(!list_empty(&per_prio->fifo_list[DD_WRITE]));
}
kfree(dd);
}
......@@ -451,22 +501,28 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
{
struct deadline_data *dd;
struct elevator_queue *eq;
enum dd_prio prio;
int ret = -ENOMEM;
eq = elevator_alloc(q, e);
if (!eq)
return -ENOMEM;
return ret;
dd = kzalloc_node(sizeof(*dd), GFP_KERNEL, q->node);
if (!dd) {
kobject_put(&eq->kobj);
return -ENOMEM;
}
if (!dd)
goto put_eq;
eq->elevator_data = dd;
INIT_LIST_HEAD(&dd->fifo_list[DD_READ]);
INIT_LIST_HEAD(&dd->fifo_list[DD_WRITE]);
dd->sort_list[DD_READ] = RB_ROOT;
dd->sort_list[DD_WRITE] = RB_ROOT;
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
struct dd_per_prio *per_prio = &dd->per_prio[prio];
INIT_LIST_HEAD(&per_prio->dispatch);
INIT_LIST_HEAD(&per_prio->fifo_list[DD_READ]);
INIT_LIST_HEAD(&per_prio->fifo_list[DD_WRITE]);
per_prio->sort_list[DD_READ] = RB_ROOT;
per_prio->sort_list[DD_WRITE] = RB_ROOT;
}
dd->fifo_expire[DD_READ] = read_expire;
dd->fifo_expire[DD_WRITE] = write_expire;
dd->writes_starved = writes_starved;
......@@ -475,10 +531,13 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
dd->fifo_batch = fifo_batch;
spin_lock_init(&dd->lock);
spin_lock_init(&dd->zone_lock);
INIT_LIST_HEAD(&dd->dispatch);
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;
for (prio = 0; prio <= DD_PRIO_MAX; prio++)
if (dd_has_work_for_prio(&dd->per_prio[prio]))
return true;
return !list_empty_careful(&dd->dispatch) ||
!list_empty_careful(&dd->fifo_list[0]) ||
!list_empty_careful(&dd->fifo_list[1]);
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);
}
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;
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);
#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 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,
};
DEADLINE_DISPATCH_ATTR(0);
DEADLINE_DISPATCH_ATTR(1);
DEADLINE_DISPATCH_ATTR(2);
#undef DEADLINE_DISPATCH_ATTR
#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");
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