This patch make a little change to lookup_bh_lru() function
to use memmove() to set new buffer_head,
better performance for some platforms.
Signed-off-by: yalin wang <yalin.wang2010@xxxxxxxxx>
---
fs/buffer.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index d6769f1..af14d69 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1331,11 +1331,9 @@ lookup_bh_lru(struct block_device *bdev, sector_t block, unsigned size)
if (bh && bh->b_blocknr == block && bh->b_bdev == bdev &&
bh->b_size == size) {
if (i) {
- while (i) {
- __this_cpu_write(bh_lrus.bhs[i],
- __this_cpu_read(bh_lrus.bhs[i - 1]));
- i--;
- }
+ memmove(&this_cpu_ptr(&bh_lrus)->bhs[1],
+ &this_cpu_ptr(&bh_lrus)->bhs[0],
+ sizeof(bh)*i);
__this_cpu_write(bh_lrus.bhs[0], bh);
}
get_bh(bh);
--
1.9.1
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