config CACHEFILES	tristate "Filesystem caching on files"	depends on FSCACHE && BLOCK	help	  This permits use of a mounted filesystem as a cache for other	  filesystems - primarily networking filesystems - thus allowing fast	  local disk to enhance the speed of slower devices. 	  See Documentation/filesystems/caching/cachefiles.txt for more	  information. config CACHEFILES_DEBUG	bool "Debug CacheFiles"	depends on CACHEFILES	help	  This permits debugging to be dynamically enabled in the filesystem	  caching on files module.  If this is set, the debugging output may be	  enabled by setting bits in /sys/modules/cachefiles/parameter/debug or	  by including a debugging specifier in /etc/cachefilesd.conf. config CACHEFILES_HISTOGRAM	bool "Gather latency information on CacheFiles"	depends on CACHEFILES && PROC_FS	help 	  This option causes latency information to be gathered on CacheFiles	  operation and exported through file: 		/proc/fs/cachefiles/histogram 	  The generation of this histogram adds a certain amount of overhead to	  execution as there are a number of points at which data is gathered,	  and on a multi-CPU system these may be on cachelines that keep	  bouncing between CPUs.  On the other hand, the histogram may be	  useful for debugging purposes.  Saying 'N' here is recommended. 	  See Documentation/filesystems/caching/cachefiles.txt for more	  information.