1# SPDX-License-Identifier: GPL-2.0-only
 2
 3config CACHEFILES
 4	tristate "Filesystem caching on files"
 5	depends on FSCACHE && BLOCK
 6	help
 7	  This permits use of a mounted filesystem as a cache for other
 8	  filesystems - primarily networking filesystems - thus allowing fast
 9	  local disk to enhance the speed of slower devices.
10
11	  See Documentation/filesystems/caching/cachefiles.rst for more
12	  information.
13
14config CACHEFILES_DEBUG
15	bool "Debug CacheFiles"
16	depends on CACHEFILES
17	help
18	  This permits debugging to be dynamically enabled in the filesystem
19	  caching on files module.  If this is set, the debugging output may be
20	  enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
21	  by including a debugging specifier in /etc/cachefilesd.conf.
22
23config CACHEFILES_HISTOGRAM
24	bool "Gather latency information on CacheFiles"
25	depends on CACHEFILES && PROC_FS
26	help
 
 
27
28	  This option causes latency information to be gathered on CacheFiles
29	  operation and exported through file:
30
31		/proc/fs/cachefiles/histogram
32
33	  The generation of this histogram adds a certain amount of overhead to
34	  execution as there are a number of points at which data is gathered,
35	  and on a multi-CPU system these may be on cachelines that keep
36	  bouncing between CPUs.  On the other hand, the histogram may be
37	  useful for debugging purposes.  Saying 'N' here is recommended.
38
39	  See Documentation/filesystems/caching/cachefiles.rst for more
40	  information.

 1# SPDX-License-Identifier: GPL-2.0-only
 2
 3config CACHEFILES
 4	tristate "Filesystem caching on files"
 5	depends on NETFS_SUPPORT && FSCACHE && BLOCK
 6	help
 7	  This permits use of a mounted filesystem as a cache for other
 8	  filesystems - primarily networking filesystems - thus allowing fast
 9	  local disk to enhance the speed of slower devices.
10
11	  See Documentation/filesystems/caching/cachefiles.rst for more
12	  information.
13
14config CACHEFILES_DEBUG
15	bool "Debug CacheFiles"
16	depends on CACHEFILES
17	help
18	  This permits debugging to be dynamically enabled in the filesystem
19	  caching on files module.  If this is set, the debugging output may be
20	  enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
21	  by including a debugging specifier in /etc/cachefilesd.conf.
22
23config CACHEFILES_ERROR_INJECTION
24	bool "Provide error injection for cachefiles"
25	depends on CACHEFILES && SYSCTL
26	help
27	  This permits error injection to be enabled in cachefiles whilst a
28	  cache is in service.
29
30config CACHEFILES_ONDEMAND
31	bool "Support for on-demand read"
32	depends on CACHEFILES
33	default n
34	help
35	  This permits userspace to enable the cachefiles on-demand read mode.
36	  In this mode, when a cache miss occurs, responsibility for fetching
37	  the data lies with the cachefiles backend instead of with the netfs
38	  and is delegated to userspace.
 
39
40	  If unsure, say N.