What:		/sys/fs/f2fs/<disk>/gc_max_sleep_time
Date:		July 2013
Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
Description:
		 Controls the maximun sleep time for gc_thread. Time
		 is in milliseconds.

What:		/sys/fs/f2fs/<disk>/gc_min_sleep_time
Date:		July 2013
Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
Description:
		 Controls the minimum sleep time for gc_thread. Time
		 is in milliseconds.

What:		/sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
Date:		July 2013
Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
Description:
		 Controls the default sleep time for gc_thread. Time
		 is in milliseconds.

What:		/sys/fs/f2fs/<disk>/gc_idle
Date:		July 2013
Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
Description:
		 Controls the victim selection policy for garbage collection.