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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
9ae326a6 DH |
2 | |
3 | config 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.txt for more | |
12 | information. | |
13 | ||
14 | config 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 | ||
23 | config 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.txt for more | |
40 | information. |