diff options
| author | Shaohua Li <shli@fb.com> | 2017-03-28 01:19:41 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-28 17:02:20 +0300 |
| commit | 88eeca495ba7de749ff253376ec6be19bb05368d (patch) | |
| tree | e2ff562f879d0b581028ba71a028cda9319039e5 /block/blk-stat.h | |
| parent | ec80991d6fc2cb17abfc5427ac1512d2ccd40589 (diff) | |
| download | linux-88eeca495ba7de749ff253376ec6be19bb05368d.tar.xz | |
block: track request size in blk_issue_stat
Currently there is no way to know the request size when the request is
finished. Next patch will need this info. We could add extra field to
record the size, but blk_issue_stat has enough space to record it, so
this patch just overloads blk_issue_stat. With this, we will have 49bits
to track time, which still is very long time.
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-stat.h')
| -rw-r--r-- | block/blk-stat.h | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/block/blk-stat.h b/block/blk-stat.h index 6ad5b8c59a79..ee47f816d5bd 100644 --- a/block/blk-stat.h +++ b/block/blk-stat.h @@ -8,12 +8,19 @@ #include <linux/timer.h> /* - * Upper 3 bits can be used elsewhere + * from upper: + * 3 bits: reserved for other usage + * 12 bits: size + * 49 bits: time */ #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 +#define BLK_STAT_SIZE_BITS 12 +#define BLK_STAT_RES_SHIFT (64 - BLK_STAT_RES_BITS) +#define BLK_STAT_SIZE_SHIFT (BLK_STAT_RES_SHIFT - BLK_STAT_SIZE_BITS) +#define BLK_STAT_TIME_MASK ((1ULL << BLK_STAT_SIZE_SHIFT) - 1) +#define BLK_STAT_SIZE_MASK \ + (((1ULL << BLK_STAT_SIZE_BITS) - 1) << BLK_STAT_SIZE_SHIFT) +#define BLK_STAT_RES_MASK (~((1ULL << BLK_STAT_RES_SHIFT) - 1)) /** * struct blk_stat_callback - Block statistics callback. @@ -73,12 +80,6 @@ void blk_free_queue_stats(struct blk_queue_stats *); void blk_stat_add(struct request *); -static inline void blk_stat_set_issue_time(struct blk_issue_stat *stat) -{ - stat->time = ((stat->time & BLK_STAT_MASK) | - (ktime_to_ns(ktime_get()) & BLK_STAT_TIME_MASK)); -} - static inline u64 __blk_stat_time(u64 time) { return time & BLK_STAT_TIME_MASK; @@ -86,7 +87,25 @@ static inline u64 __blk_stat_time(u64 time) static inline u64 blk_stat_time(struct blk_issue_stat *stat) { - return __blk_stat_time(stat->time); + return __blk_stat_time(stat->stat); +} + +static inline sector_t blk_capped_size(sector_t size) +{ + return size & ((1ULL << BLK_STAT_SIZE_BITS) - 1); +} + +static inline sector_t blk_stat_size(struct blk_issue_stat *stat) +{ + return (stat->stat & BLK_STAT_SIZE_MASK) >> BLK_STAT_SIZE_SHIFT; +} + +static inline void blk_stat_set_issue(struct blk_issue_stat *stat, + sector_t size) +{ + stat->stat = (stat->stat & BLK_STAT_RES_MASK) | + (ktime_to_ns(ktime_get()) & BLK_STAT_TIME_MASK) | + (((u64)blk_capped_size(size)) << BLK_STAT_SIZE_SHIFT); } /* |