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block/rq_qos: implement rq_qos_ops->queue_depth_changed()

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wbt already gets queue depth changed notification through
wbt_set_queue_depth().  Generalize it into
rq_qos_ops->queue_depth_changed() so that other rq_qos policies can
easily hook into the events too.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-08-28 15:05:55 -07:00 committed by Jens Axboe
parent d3e65ffff6
commit 9677a3e01f
5 changed files with 26 additions and 15 deletions
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9
block/blk-rq-qos.c
View file

@ -101,6 +101,15 @@ void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio)
} while (rqos);
}
void __rq_qos_queue_depth_changed(struct rq_qos *rqos)
{
do {
if (rqos->ops->queue_depth_changed)
rqos->ops->queue_depth_changed(rqos);
rqos = rqos->next;
} while (rqos);
}
/*
* Return true, if we can't increase the depth further by scaling
*/

8
block/blk-rq-qos.h
View file

@ -41,6 +41,7 @@ struct rq_qos_ops {
void (*done)(struct rq_qos *, struct request *);
void (*done_bio)(struct rq_qos *, struct bio *);
void (*cleanup)(struct rq_qos *, struct bio *);
void (*queue_depth_changed)(struct rq_qos *);
void (*exit)(struct rq_qos *);
const struct blk_mq_debugfs_attr *debugfs_attrs;
};
@ -138,6 +139,7 @@ void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);
void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);
void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio);
void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);
void __rq_qos_queue_depth_changed(struct rq_qos *rqos);
static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
{
@ -194,6 +196,12 @@ static inline void rq_qos_merge(struct request_queue *q, struct request *rq,
__rq_qos_merge(q->rq_qos, rq, bio);
}
static inline void rq_qos_queue_depth_changed(struct request_queue *q)
{
if (q->rq_qos)
__rq_qos_queue_depth_changed(q->rq_qos);
}
void rq_qos_exit(struct request_queue *);
#endif

2
block/blk-settings.c
View file

@ -805,7 +805,7 @@ EXPORT_SYMBOL(blk_queue_update_dma_alignment);
void blk_set_queue_depth(struct request_queue *q, unsigned int depth)
{
q->queue_depth = depth;
wbt_set_queue_depth(q, depth);
rq_qos_queue_depth_changed(q);
}
EXPORT_SYMBOL(blk_set_queue_depth);

18
block/blk-wbt.c
View file

@ -629,15 +629,6 @@ static void wbt_requeue(struct rq_qos *rqos, struct request *rq)
}
}
void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
{
struct rq_qos *rqos = wbt_rq_qos(q);
if (rqos) {
RQWB(rqos)->rq_depth.queue_depth = depth;
__wbt_update_limits(RQWB(rqos));
}
}
void wbt_set_write_cache(struct request_queue *q, bool write_cache_on)
{
struct rq_qos *rqos = wbt_rq_qos(q);
@ -689,6 +680,12 @@ static int wbt_data_dir(const struct request *rq)
return -1;
}
static void wbt_queue_depth_changed(struct rq_qos *rqos)
{
RQWB(rqos)->rq_depth.queue_depth = blk_queue_depth(rqos->q);
__wbt_update_limits(RQWB(rqos));
}
static void wbt_exit(struct rq_qos *rqos)
{
struct rq_wb *rwb = RQWB(rqos);
@ -811,6 +808,7 @@ static struct rq_qos_ops wbt_rqos_ops = {
.requeue = wbt_requeue,
.done = wbt_done,
.cleanup = wbt_cleanup,
.queue_depth_changed = wbt_queue_depth_changed,
.exit = wbt_exit,
#ifdef CONFIG_BLK_DEBUG_FS
.debugfs_attrs = wbt_debugfs_attrs,
@ -853,7 +851,7 @@ int wbt_init(struct request_queue *q)
rwb->min_lat_nsec = wbt_default_latency_nsec(q);
wbt_set_queue_depth(q, blk_queue_depth(q));
wbt_queue_depth_changed(&rwb->rqos);
wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags));
return 0;

4
block/blk-wbt.h
View file

@ -95,7 +95,6 @@ void wbt_enable_default(struct request_queue *);
u64 wbt_get_min_lat(struct request_queue *q);
void wbt_set_min_lat(struct request_queue *q, u64 val);
void wbt_set_queue_depth(struct request_queue *, unsigned int);
void wbt_set_write_cache(struct request_queue *, bool);
u64 wbt_default_latency_nsec(struct request_queue *);
@ -118,9 +117,6 @@ static inline void wbt_disable_default(struct request_queue *q)
static inline void wbt_enable_default(struct request_queue *q)
{
}
static inline void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
{
}
static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
{
}