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| author | Yang Guo <guoyang2@huawei.com> | 2021-02-24 12:02:48 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-24 13:38:28 -0800 |
| commit | 4ebd3aec3842662300979dacd6fb38e3e8edf7f4 (patch) | |
| tree | 5c88f3a4390297fe73d8ac51e9613b35f4fc0a87 | |
| parent | 826ea860bc4d119731026655c383c7773c9d2dad (diff) | |
| download | linux-4ebd3aec3842662300979dacd6fb38e3e8edf7f4.tar.bz2 | |
fs/buffer.c: add checking buffer head stat before clear
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.
Link: https://lkml.kernel.org/r/1612332890-57918-1-git-send-email-zhangshaokun@hisilicon.com
Signed-off-by: Yang Guo <guoyang2@huawei.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/buffer.c | 3 |
1 files changed, 2 insertions, 1 deletions
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; |