diff options
| author |   Jens Axboe <axboe@kernel.dk> | 2021-10-18 11:39:45 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 14:43:23 -0600 |
| commit | f09313c57a17683cbcb305989daf1d94b49fd32c (patch) | |
| tree | e3c46d53930f6a7ba67f021f60ddb291f0722602 /include/linux | |
| parent | udf: use sb_bdev_nr_blocks (diff) | |
| download | wireguard-linux-f09313c57a17683cbcb305989daf1d94b49fd32c.tar.xz wireguard-linux-f09313c57a17683cbcb305989daf1d94b49fd32c.zip | |
block: cache inode size in bdev
Reading the inode size brings in a new cacheline for IO submit, and
it's in the hot path being checked for every single IO. When doing
millions of IOs per core per second, this is noticeable overhead.
Cache the nr_sectors in the bdev itself.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blk_types.h | 1 | ||||
| -rw-r--r-- | include/linux/genhd.h | 8 |
2 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 472e55e0e94f..fe065c394fff 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -39,6 +39,7 @@ struct bio_crypt_ctx; struct block_device { sector_t bd_start_sect; + sector_t bd_nr_sectors; struct disk_stats __percpu *bd_stats; unsigned long bd_stamp; bool bd_read_only; /* read-only policy */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 7b0326661a1e..900325aa5d31 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -236,14 +236,14 @@ static inline sector_t get_start_sect(struct block_device *bdev) return bdev->bd_start_sect; } -static inline loff_t bdev_nr_bytes(struct block_device *bdev) +static inline sector_t bdev_nr_sectors(struct block_device *bdev) { - return i_size_read(bdev->bd_inode); + return bdev->bd_nr_sectors; } -static inline sector_t bdev_nr_sectors(struct block_device *bdev) +static inline loff_t bdev_nr_bytes(struct block_device *bdev) { - return bdev_nr_bytes(bdev) >> SECTOR_SHIFT; + return bdev_nr_sectors(bdev) << SECTOR_SHIFT; } static inline sector_t get_capacity(struct gendisk *disk) |