a79050434b
blkcg-qos is going to do essentially what wbt does, only on a cgroup basis. Break out the common code that will be shared between blkcg-qos and wbt into blk-rq-qos.* so they can both utilize the same infrastructure. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
#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>
|
|
|
|
enum rq_qos_id {
|
|
RQ_QOS_WBT,
|
|
RQ_QOS_CGROUP,
|
|
};
|
|
|
|
struct rq_wait {
|
|
wait_queue_head_t wait;
|
|
atomic_t inflight;
|
|
};
|
|
|
|
struct rq_qos {
|
|
struct rq_qos_ops *ops;
|
|
struct request_queue *q;
|
|
enum rq_qos_id id;
|
|
struct rq_qos *next;
|
|
};
|
|
|
|
struct rq_qos_ops {
|
|
enum wbt_flags (*throttle)(struct rq_qos *, struct bio *,
|
|
spinlock_t *);
|
|
void (*issue)(struct rq_qos *, struct request *);
|
|
void (*requeue)(struct rq_qos *, struct request *);
|
|
void (*done)(struct rq_qos *, struct request *);
|
|
void (*cleanup)(struct rq_qos *, enum wbt_flags);
|
|
void (*exit)(struct rq_qos *);
|
|
};
|
|
|
|
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 *blkcg_rq_qos(struct request_queue *q)
|
|
{
|
|
return rq_qos_id(q, RQ_QOS_CGROUP);
|
|
}
|
|
|
|
static inline void rq_wait_init(struct rq_wait *rq_wait)
|
|
{
|
|
atomic_set(&rq_wait->inflight, 0);
|
|
init_waitqueue_head(&rq_wait->wait);
|
|
}
|
|
|
|
static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
|
|
{
|
|
rqos->next = q->rq_qos;
|
|
q->rq_qos = rqos;
|
|
}
|
|
|
|
static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
|
|
{
|
|
struct rq_qos *cur, *prev = NULL;
|
|
for (cur = q->rq_qos; cur; cur = cur->next) {
|
|
if (cur == rqos) {
|
|
if (prev)
|
|
prev->next = rqos->next;
|
|
else
|
|
q->rq_qos = cur;
|
|
break;
|
|
}
|
|
prev = cur;
|
|
}
|
|
}
|
|
|
|
bool rq_wait_inc_below(struct rq_wait *rq_wait, int limit);
|
|
void rq_depth_scale_up(struct rq_depth *rqd);
|
|
void 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 request_queue *, enum wbt_flags);
|
|
void rq_qos_done(struct request_queue *, struct request *);
|
|
void rq_qos_issue(struct request_queue *, struct request *);
|
|
void rq_qos_requeue(struct request_queue *, struct request *);
|
|
enum wbt_flags rq_qos_throttle(struct request_queue *, struct bio *, spinlock_t *);
|
|
void rq_qos_exit(struct request_queue *);
|
|
#endif
|