mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
![Kundan Kumar](/assets/img/avatar_default.png)
Write-back throttling (WBT) enables QUEUE_FLAG_STATS on the request queue. But WBT does not make sense for passthrough io, so skip QUEUE_FLAG_STATS processing. Also skip rq_qos_issue/done for passthrough io. Overall, the change gives ~11% hike in peak performance. Signed-off-by: Kundan Kumar <kundan.kumar@samsung.com> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com> Link: https://lore.kernel.org/r/20231123190331.7934-1-kundan.kumar@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
180 lines
4.6 KiB
C
180 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef RQ_QOS_H
|
|
#define RQ_QOS_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/blk_types.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/blk-mq.h>
|
|
|
|
#include "blk-mq-debugfs.h"
|
|
|
|
struct blk_mq_debugfs_attr;
|
|
|
|
enum rq_qos_id {
|
|
RQ_QOS_WBT,
|
|
RQ_QOS_LATENCY,
|
|
RQ_QOS_COST,
|
|
};
|
|
|
|
struct rq_wait {
|
|
wait_queue_head_t wait;
|
|
atomic_t inflight;
|
|
};
|
|
|
|
struct rq_qos {
|
|
const struct rq_qos_ops *ops;
|
|
struct gendisk *disk;
|
|
enum rq_qos_id id;
|
|
struct rq_qos *next;
|
|
#ifdef CONFIG_BLK_DEBUG_FS
|
|
struct dentry *debugfs_dir;
|
|
#endif
|
|
};
|
|
|
|
struct rq_qos_ops {
|
|
void (*throttle)(struct rq_qos *, struct bio *);
|
|
void (*track)(struct rq_qos *, struct request *, struct bio *);
|
|
void (*merge)(struct rq_qos *, struct request *, struct bio *);
|
|
void (*issue)(struct rq_qos *, struct request *);
|
|
void (*requeue)(struct rq_qos *, struct request *);
|
|
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;
|
|
};
|
|
|
|
struct rq_depth {
|
|
unsigned int max_depth;
|
|
|
|
int scale_step;
|
|
bool scaled_max;
|
|
|
|
unsigned int queue_depth;
|
|
unsigned int default_depth;
|
|
};
|
|
|
|
static inline struct rq_qos *rq_qos_id(struct request_queue *q,
|
|
enum rq_qos_id id)
|
|
{
|
|
struct rq_qos *rqos;
|
|
for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
|
|
if (rqos->id == id)
|
|
break;
|
|
}
|
|
return rqos;
|
|
}
|
|
|
|
static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
|
|
{
|
|
return rq_qos_id(q, RQ_QOS_WBT);
|
|
}
|
|
|
|
static inline struct rq_qos *iolat_rq_qos(struct request_queue *q)
|
|
{
|
|
return rq_qos_id(q, RQ_QOS_LATENCY);
|
|
}
|
|
|
|
static inline void rq_wait_init(struct rq_wait *rq_wait)
|
|
{
|
|
atomic_set(&rq_wait->inflight, 0);
|
|
init_waitqueue_head(&rq_wait->wait);
|
|
}
|
|
|
|
int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
|
|
const struct rq_qos_ops *ops);
|
|
void rq_qos_del(struct rq_qos *rqos);
|
|
|
|
typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data);
|
|
typedef void (cleanup_cb_t)(struct rq_wait *rqw, void *private_data);
|
|
|
|
void rq_qos_wait(struct rq_wait *rqw, void *private_data,
|
|
acquire_inflight_cb_t *acquire_inflight_cb,
|
|
cleanup_cb_t *cleanup_cb);
|
|
bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit);
|
|
bool rq_depth_scale_up(struct rq_depth *rqd);
|
|
bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
|
|
bool rq_depth_calc_max_depth(struct rq_depth *rqd);
|
|
|
|
void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);
|
|
void __rq_qos_done(struct rq_qos *rqos, struct request *rq);
|
|
void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);
|
|
void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);
|
|
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)
|
|
{
|
|
if (q->rq_qos)
|
|
__rq_qos_cleanup(q->rq_qos, bio);
|
|
}
|
|
|
|
static inline void rq_qos_done(struct request_queue *q, struct request *rq)
|
|
{
|
|
if (q->rq_qos && !blk_rq_is_passthrough(rq))
|
|
__rq_qos_done(q->rq_qos, rq);
|
|
}
|
|
|
|
static inline void rq_qos_issue(struct request_queue *q, struct request *rq)
|
|
{
|
|
if (q->rq_qos)
|
|
__rq_qos_issue(q->rq_qos, rq);
|
|
}
|
|
|
|
static inline void rq_qos_requeue(struct request_queue *q, struct request *rq)
|
|
{
|
|
if (q->rq_qos)
|
|
__rq_qos_requeue(q->rq_qos, rq);
|
|
}
|
|
|
|
static inline void rq_qos_done_bio(struct bio *bio)
|
|
{
|
|
if (bio->bi_bdev && (bio_flagged(bio, BIO_QOS_THROTTLED) ||
|
|
bio_flagged(bio, BIO_QOS_MERGED))) {
|
|
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
|
|
if (q->rq_qos)
|
|
__rq_qos_done_bio(q->rq_qos, bio);
|
|
}
|
|
}
|
|
|
|
static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio)
|
|
{
|
|
if (q->rq_qos) {
|
|
bio_set_flag(bio, BIO_QOS_THROTTLED);
|
|
__rq_qos_throttle(q->rq_qos, bio);
|
|
}
|
|
}
|
|
|
|
static inline void rq_qos_track(struct request_queue *q, struct request *rq,
|
|
struct bio *bio)
|
|
{
|
|
if (q->rq_qos)
|
|
__rq_qos_track(q->rq_qos, rq, bio);
|
|
}
|
|
|
|
static inline void rq_qos_merge(struct request_queue *q, struct request *rq,
|
|
struct bio *bio)
|
|
{
|
|
if (q->rq_qos) {
|
|
bio_set_flag(bio, BIO_QOS_MERGED);
|
|
__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
|