commit 237c0790e54020d522b8fd23097e8dcafb4e331d
author Jaegeuk Kim <jaegeuk@kernel.org> Thu Jun 30 18:49:15 2016 -0700
committer Jaegeuk Kim <jaegeuk@kernel.org> Fri Jul 08 10:33:29 2016 -0700
tree 57af2ddd9bff9382d6330ca894497d3fb37bfb2e
parent fe76b796fc5194cc3d57265002e3a748566d073f

f2fs: call SetPageUptodate if needed

SetPageUptodate() issues memory barrier, resulting in performance degrdation.
Let's avoid that.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d07e775..2b777a4 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -81,7 +81,8 @@
 		zero_user_segment(page, offset, PAGE_SIZE);
 	}
 	set_page_dirty(page);
-	SetPageUptodate(page);
+	if (!PageUptodate(page))
+		SetPageUptodate(page);
 
 	trace_f2fs_vm_page_mkwrite(page, DATA);
 mapped: