VisionFive2 Linux kernel

ec8f24b7faaf3 (Thomas Gleixner       2019-05-19 13:07:45 +0100  1) # SPDX-License-Identifier: GPL-2.0-only
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  2) 
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  3) config FSCACHE
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  4) 	tristate "General filesystem local caching manager"
26aaeffcafe6c (David Howells         2021-02-22 11:39:47 +0000  5) 	select NETFS_SUPPORT
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  6) 	help
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  7) 	  This option enables a generic filesystem caching manager that can be
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  8) 	  used by various network and other filesystems to cache data locally.
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100  9) 	  Different sorts of caches can be plugged in, depending on the
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 10) 	  resources available.
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 11) 
fd299b2a7339a (Mauro Carvalho Chehab 2020-04-27 23:16:54 +0200 12) 	  See Documentation/filesystems/caching/fscache.rst for more information.
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 13) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 14) config FSCACHE_STATS
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 15) 	bool "Gather statistical information on local caching"
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 16) 	depends on FSCACHE && PROC_FS
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 17) 	help
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 18) 	  This option causes statistical information to be gathered on local
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 19) 	  caching and exported through file:
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 20) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 21) 		/proc/fs/fscache/stats
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 22) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 23) 	  The gathering of statistics adds a certain amount of overhead to
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 24) 	  execution as there are a quite a few stats gathered, and on a
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 25) 	  multi-CPU system these may be on cachelines that keep bouncing
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 26) 	  between CPUs.  On the other hand, the stats are very useful for
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 27) 	  debugging purposes.  Saying 'Y' here is recommended.
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 28) 
fd299b2a7339a (Mauro Carvalho Chehab 2020-04-27 23:16:54 +0200 29) 	  See Documentation/filesystems/caching/fscache.rst for more information.
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 30) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 31) config FSCACHE_HISTOGRAM
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 32) 	bool "Gather latency information on local caching"
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 33) 	depends on FSCACHE && PROC_FS
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 34) 	help
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 35) 	  This option causes latency information to be gathered on local
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 36) 	  caching and exported through file:
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 37) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 38) 		/proc/fs/fscache/histogram
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 39) 
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 40) 	  The generation of this histogram adds a certain amount of overhead to
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 41) 	  execution as there are a number of points at which data is gathered,
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 42) 	  and on a multi-CPU system these may be on cachelines that keep
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 43) 	  bouncing between CPUs.  On the other hand, the histogram may be
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 44) 	  useful for debugging purposes.  Saying 'N' here is recommended.
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 45) 
fd299b2a7339a (Mauro Carvalho Chehab 2020-04-27 23:16:54 +0200 46) 	  See Documentation/filesystems/caching/fscache.rst for more information.
7394daa8c61df (David Howells         2009-04-03 16:42:37 +0100 47) 
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 48) config FSCACHE_DEBUG
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 49) 	bool "Debug FS-Cache"
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 50) 	depends on FSCACHE
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 51) 	help
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 52) 	  This permits debugging to be dynamically enabled in the local caching
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 53) 	  management module.  If this is set, the debugging output may be
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 54) 	  enabled by setting bits in /sys/modules/fscache/parameter/debug.
06b3db1b9bccd (David Howells         2009-04-03 16:42:36 +0100 55) 
fd299b2a7339a (Mauro Carvalho Chehab 2020-04-27 23:16:54 +0200 56) 	  See Documentation/filesystems/caching/fscache.rst for more information.
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 57) 
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 58) config FSCACHE_OBJECT_LIST
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 59) 	bool "Maintain global object list for debugging purposes"
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 60) 	depends on FSCACHE && PROC_FS
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 61) 	help
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 62) 	  Maintain a global list of active fscache objects that can be
4fbf4291aa159 (David Howells         2009-11-19 18:11:04 +0000 63) 	  retrieved through /proc/fs/fscache/objects for debugging purposes