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43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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#ifndef BLK_STAT_H
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#define BLK_STAT_H
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/*
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* ~0.13s window as a power-of-2 (2^27 nsecs)
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*/
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#define BLK_STAT_NSEC 134217728ULL
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#define BLK_STAT_NSEC_MASK ~(BLK_STAT_NSEC - 1)
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/*
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* Upper 3 bits can be used elsewhere
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*/
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#define BLK_STAT_RES_BITS 3
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#define BLK_STAT_SHIFT (64 - BLK_STAT_RES_BITS)
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#define BLK_STAT_TIME_MASK ((1ULL << BLK_STAT_SHIFT) - 1)
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#define BLK_STAT_MASK ~BLK_STAT_TIME_MASK
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enum {
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BLK_STAT_READ = 0,
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BLK_STAT_WRITE,
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};
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void blk_stat_add(struct blk_rq_stat *, struct request *);
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void blk_hctx_stat_get(struct blk_mq_hw_ctx *, struct blk_rq_stat *);
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void blk_queue_stat_get(struct request_queue *, struct blk_rq_stat *);
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void blk_stat_clear(struct request_queue *);
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void blk_stat_init(struct blk_rq_stat *);
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bool blk_stat_is_current(struct blk_rq_stat *);
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void blk_stat_set_issue_time(struct blk_issue_stat *);
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bool blk_stat_enable(struct request_queue *);
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static inline u64 __blk_stat_time(u64 time)
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{
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return time & BLK_STAT_TIME_MASK;
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}
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static inline u64 blk_stat_time(struct blk_issue_stat *stat)
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{
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return __blk_stat_time(stat->time);
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}
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#endif
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