linux-kernel - [PATCH 2/2] f2fs: avoid writepage lock when many threads call fsync

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Date:	Fri, 11 Mar 2016 16:14:37 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 2/2] f2fs: avoid writepage lock when many threads call fsync

If many threads try to write small number of data and fsync, we should avoid
writepages lock contention.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/data.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index e5c762b..fb75699 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1400,7 +1400,8 @@ static int f2fs_write_data_pages(struct address_space *mapping,
 
 	diff = nr_pages_to_write(sbi, DATA, wbc);
 
-	if (!S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_ALL) {
+	if (!S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_ALL &&
+			!is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU)) {
 		mutex_lock(&sbi->writepages);
 		locked = true;
 	}
-- 
2.6.3