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 /block/genhd.c | |
| parent | e4ae4735f7c2da77db57ee090b9f513bfe80d285 (diff) | |
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 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c index 759bc06810f8..53495e3391e3 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -58,6 +58,7 @@ void set_capacity(struct gendisk *disk, sector_t sectors) spin_lock(&bdev->bd_size_lock); i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); + bdev->bd_nr_sectors = sectors; spin_unlock(&bdev->bd_size_lock); } EXPORT_SYMBOL(set_capacity); |