1# SPDX-License-Identifier: GPL-2.0-only 2 3config FSCACHE 4 tristate "General filesystem local caching manager" 5 select NETFS_SUPPORT 6 help 7 This option enables a generic filesystem caching manager that can be 8 used by various network and other filesystems to cache data locally. 9 Different sorts of caches can be plugged in, depending on the 10 resources available. 11 12 See Documentation/filesystems/caching/fscache.rst for more information. 13 14config FSCACHE_STATS 15 bool "Gather statistical information on local caching" 16 depends on FSCACHE && PROC_FS 17 help 18 This option causes statistical information to be gathered on local 19 caching and exported through file: 20 21 /proc/fs/fscache/stats 22 23 The gathering of statistics adds a certain amount of overhead to 24 execution as there are a quite a few stats gathered, and on a 25 multi-CPU system these may be on cachelines that keep bouncing 26 between CPUs. On the other hand, the stats are very useful for 27 debugging purposes. Saying 'Y' here is recommended. 28 29 See Documentation/filesystems/caching/fscache.rst for more information. 30 31config FSCACHE_HISTOGRAM 32 bool "Gather latency information on local caching" 33 depends on FSCACHE && PROC_FS 34 help 35 This option causes latency information to be gathered on local 36 caching and exported through file: 37 38 /proc/fs/fscache/histogram 39 40 The generation of this histogram adds a certain amount of overhead to 41 execution as there are a number of points at which data is gathered, 42 and on a multi-CPU system these may be on cachelines that keep 43 bouncing between CPUs. On the other hand, the histogram may be 44 useful for debugging purposes. Saying 'N' here is recommended. 45 46 See Documentation/filesystems/caching/fscache.rst for more information. 47 48config FSCACHE_DEBUG 49 bool "Debug FS-Cache" 50 depends on FSCACHE 51 help 52 This permits debugging to be dynamically enabled in the local caching 53 management module. If this is set, the debugging output may be 54 enabled by setting bits in /sys/modules/fscache/parameter/debug. 55 56 See Documentation/filesystems/caching/fscache.rst for more information. 57 58config FSCACHE_OBJECT_LIST 59 bool "Maintain global object list for debugging purposes" 60 depends on FSCACHE && PROC_FS 61 help 62 Maintain a global list of active fscache objects that can be 63 retrieved through /proc/fs/fscache/objects for debugging purposes 64