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blk-rq-qos: refactor out common elements of blk-wbt

Browse source 
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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Josef Bacik 2018-07-03 09:32:35 -06:00 • committed by Jens Axboe
commit a79050434b
10 changed files with 478 additions and 251 deletions
Download patch file Download diff file Expand all files Collapse all files

67
block/blk-wbt.h
View file

@ -9,6 +9,7 @@
#include <linux/ktime.h>
#include "blk-stat.h"
#include "blk-rq-qos.h"
enum wbt_flags {
WBT_TRACKED = 1, /* write, tracked for throttling */
@ -35,20 +36,12 @@ enum {
WBT_STATE_ON_MANUAL = 2,
};
struct rq_wait {
wait_queue_head_t wait;
atomic_t inflight;
};
struct rq_wb {
/*
* Settings that govern how we throttle
*/
unsigned int wb_background; /* background writeback */
unsigned int wb_normal; /* normal writeback */
unsigned int wb_max; /* max throughput writeback */
int scale_step;
bool scaled_max;
short enable_state; /* WBT_STATE_* */
@ -67,15 +60,20 @@ struct rq_wb {
void *sync_cookie;
unsigned int wc;
unsigned int queue_depth;
unsigned long last_issue; /* last non-throttled issue */
unsigned long last_comp; /* last non-throttled comp */
unsigned long min_lat_nsec;
struct request_queue *queue;
struct rq_qos rqos;
struct rq_wait rq_wait[WBT_NUM_RWQ];
struct rq_depth rq_depth;
};
static inline struct rq_wb *RQWB(struct rq_qos *rqos)
{
return container_of(rqos, struct rq_wb, rqos);
}
static inline unsigned int wbt_inflight(struct rq_wb *rwb)
{
unsigned int i, ret = 0;
@ -86,6 +84,7 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb)
return ret;
}
#ifdef CONFIG_BLK_WBT
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
@ -93,19 +92,16 @@ static inline void wbt_track(struct request *rq, enum wbt_flags flags)
rq->wbt_flags |= flags;
}
void __wbt_done(struct rq_wb *, enum wbt_flags);
void wbt_done(struct rq_wb *, struct request *);
enum wbt_flags wbt_wait(struct rq_wb *, struct bio *, spinlock_t *);
int wbt_init(struct request_queue *);
void wbt_exit(struct request_queue *);
void wbt_update_limits(struct rq_wb *);
void wbt_requeue(struct rq_wb *, struct request *);
void wbt_issue(struct rq_wb *, struct request *);
void wbt_update_limits(struct request_queue *);
void wbt_disable_default(struct request_queue *);
void wbt_enable_default(struct request_queue *);
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
void wbt_set_write_cache(struct rq_wb *, bool);
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 *);
@ -114,31 +110,11 @@ u64 wbt_default_latency_nsec(struct request_queue *);
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
{
}
static inline void __wbt_done(struct rq_wb *rwb, enum wbt_flags flags)
{
}
static inline void wbt_done(struct rq_wb *rwb, struct request *rq)
{
}
static inline enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio,
spinlock_t *lock)
{
return 0;
}
static inline int wbt_init(struct request_queue *q)
{
return -EINVAL;
}
static inline void wbt_exit(struct request_queue *q)
{
}
static inline void wbt_update_limits(struct rq_wb *rwb)
{
}
static inline void wbt_requeue(struct rq_wb *rwb, struct request *rq)
{
}
static inline void wbt_issue(struct rq_wb *rwb, struct request *rq)
static inline void wbt_update_limits(struct request_queue *q)
{
}
static inline void wbt_disable_default(struct request_queue *q)
@ -147,10 +123,17 @@ 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 rq_wb *rwb, unsigned int depth)
static inline void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
{
}
static inline void wbt_set_write_cache(struct rq_wb *rwb, bool wc)
static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
{
}
static inline u64 wbt_get_min_lat(struct request_queue *q)
{
return 0;
}
static inline void wbt_set_min_lat(struct request_queue *q, u64 val)
{
}
static inline u64 wbt_default_latency_nsec(struct request_queue *q)