summaryrefslogblamecommitdiff
path: root/block/blk-stat.h
blob: 34384328b46b2e3d90675c8c385667913f17e070 (plain) (tree) 
cf43e6be865a ^

















cf43e6be865a ^




















1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

















                                                              



















                                                                      
#ifndef BLK_STAT_H
#define BLK_STAT_H

/*
 * ~0.13s window as a power-of-2 (2^27 nsecs)
 */
#define BLK_STAT_NSEC		134217728ULL
#define BLK_STAT_NSEC_MASK	~(BLK_STAT_NSEC - 1)

/*
 * Upper 3 bits can be used elsewhere
 */
#define BLK_STAT_RES_BITS	3
#define BLK_STAT_SHIFT		(64 - BLK_STAT_RES_BITS)
#define BLK_STAT_TIME_MASK	((1ULL << BLK_STAT_SHIFT) - 1)
#define BLK_STAT_MASK		~BLK_STAT_TIME_MASK

void blk_stat_add(struct blk_rq_stat *, struct request *);
void blk_hctx_stat_get(struct blk_mq_hw_ctx *, struct blk_rq_stat *);
void blk_queue_stat_get(struct request_queue *, struct blk_rq_stat *);
void blk_stat_clear(struct request_queue *);
void blk_stat_init(struct blk_rq_stat *);
bool blk_stat_is_current(struct blk_rq_stat *);
void blk_stat_set_issue_time(struct blk_issue_stat *);
bool blk_stat_enable(struct request_queue *);

static inline u64 __blk_stat_time(u64 time)
{
	return time & BLK_STAT_TIME_MASK;
}

static inline u64 blk_stat_time(struct blk_issue_stat *stat)
{
	return __blk_stat_time(stat->time);
}

#endif