From: Yang Guo <[email protected]> clear_buffer_new() is used to clear buffer new stat. When PAGE_SIZE is 64K, most buffer heads in the list are not needed to clear. clear_buffer_new() has an enpensive atomic modification operation, Let's add checking buffer head before clear it as __block_write_begin_int does which is good for performance.
Cc: Alexander Viro <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Nick Piggin <[email protected]> Signed-off-by: Yang Guo <[email protected]> Signed-off-by: Shaokun Zhang <[email protected]> --- fs/buffer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/buffer.c b/fs/buffer.c index 32647d2011df..f1c3a5b27a90 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2083,7 +2083,8 @@ static int __block_commit_write(struct inode *inode, struct page *page, set_buffer_uptodate(bh); mark_buffer_dirty(bh); } - clear_buffer_new(bh); + if (buffer_new(bh)) + clear_buffer_new(bh); block_start = block_end; bh = bh->b_this_page; -- 2.7.4
