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