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fs/buffer: avoid redundant lookup in getblk slowpath

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__getblk_slow() already implies failing a first lookup
as the fastpath, so try to create the buffers immediately
and avoid the redundant lookup. This saves 5-10% of the
total cost/latency of the slowpath.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/20250515173925.147823-3-dave@stgolabs.net
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Davidlohr Bueso
2025-05-15 10:39:23 -07:00
committed by Christian Brauner
parent fb27226c38
commit 98a6ca1633
1 changed files with 3 additions and 3 deletions
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6
fs/buffer.c
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@@ -1139,15 +1139,15 @@ __getblk_slow(struct block_device *bdev, sector_t block,
for (;;) {
struct buffer_head *bh;
if (!grow_buffers(bdev, block, size, gfp))
return NULL;
if (blocking)
bh = __find_get_block_nonatomic(bdev, block, size);
else
bh = __find_get_block(bdev, block, size);
if (bh)
return bh;
if (!grow_buffers(bdev, block, size, gfp))
return NULL;
}
}