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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 <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Sheng Yong 2017-11-22 18:23:38 +08:00 • committed by Jaegeuk Kim
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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@ -186,3 +186,9 @@ Date: August 2017
Contact: "Jaegeuk Kim" <[email protected]>
Description:
Controls sleep time of GC urgent mode
What: /sys/fs/f2fs/<disk>/readdir_ra
Date: November 2017
Contact: "Sheng Yong" <[email protected]>
Description:
Controls readahead inode block in readdir.