projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ae326a6 DH |
1 | |
| 2 | config CACHEFILES | |
| 3 | tristate "Filesystem caching on files" | |
| 4 | depends on FSCACHE && BLOCK | |
| 5 | help | |
| 6 | This permits use of a mounted filesystem as a cache for other | |
| 7 | filesystems - primarily networking filesystems - thus allowing fast | |
| 8 | local disk to enhance the speed of slower devices. | |
| 9 | ||
| 10 | See Documentation/filesystems/caching/cachefiles.txt for more | |
| 11 | information. | |
| 12 | ||
| 13 | config CACHEFILES_DEBUG | |
| 14 | bool "Debug CacheFiles" | |
| 15 | depends on CACHEFILES | |
| 16 | help | |
| 17 | This permits debugging to be dynamically enabled in the filesystem | |
| 18 | caching on files module. If this is set, the debugging output may be | |
| 19 | enabled by setting bits in /sys/modules/cachefiles/parameter/debug or | |
| 20 | by including a debugging specifier in /etc/cachefilesd.conf. | |
| 21 | ||
| 22 | config CACHEFILES_HISTOGRAM | |
| 23 | bool "Gather latency information on CacheFiles" | |
| 24 | depends on CACHEFILES && PROC_FS | |
| 25 | help | |
| 26 | ||
| 27 | This option causes latency information to be gathered on CacheFiles | |
| 28 | operation and exported through file: | |
| 29 | ||
| 30 | /proc/fs/cachefiles/histogram | |
| 31 | ||
| 32 | The generation of this histogram adds a certain amount of overhead to | |
| 33 | execution as there are a number of points at which data is gathered, | |
| 34 | and on a multi-CPU system these may be on cachelines that keep | |
| 35 | bouncing between CPUs. On the other hand, the histogram may be | |
| 36 | useful for debugging purposes. Saying 'N' here is recommended. | |
| 37 | ||
| 38 | See Documentation/filesystems/caching/cachefiles.txt for more | |
| 39 | information. |