tree 1447ee818226bbf2f5d5dd826f7be2e21d446657
parent 4e68a15eeebc104236691986aacb93a8745462c2
author Sheng Yong <shengyong1@huawei.com> 1511346218 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1517369380 -0800

f2fs: introduce sysfs readdir_ra to readahead inode block in readdir

This patch introduces a sysfs interface readdir_ra to enable/disable
readaheading inode block in f2fs_readdir. When readdir_ra is enabled,
it improves the performance of "readdir + stat".

For 300,000 files:
	time find /data/test > /dev/null
disable readdir_ra: 1m25.69s real  0m01.94s user  0m50.80s system
enable  readdir_ra: 0m18.55s real  0m00.44s user  0m15.39s system

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>