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authorJens Axboe <axboe@kernel.dk>2021-10-18 11:39:45 -0600
committerJens Axboe <axboe@kernel.dk>2021-10-18 14:43:23 -0600
commitf09313c57a17683cbcb305989daf1d94b49fd32c (patch)
treee3c46d53930f6a7ba67f021f60ddb291f0722602 /block/genhd.c
parente4ae4735f7c2da77db57ee090b9f513bfe80d285 (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.c1
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);