__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@xxxxxxxxxxxx>
---
fs/buffer.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 5a4342881f3b..b02cced96529 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -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;
}
}
--
2.39.5
