f2fs: introduce sysfs readdir_ra to readahead inode block in readdir

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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>

...

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Sheng Yong 2017-11-22 18:23:38 +08:00 • committed by Jaegeuk Kim

parent 5921aaa185

commit f6df8f234e

4 changed files with 13 additions and 0 deletions

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6

Documentation/ABI/testing/sysfs-fs-f2fs

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4

fs/f2fs/dir.c

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1

fs/f2fs/f2fs.h

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2

fs/f2fs/sysfs.c

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