7394daa8c6
Make FS-Cache create its /proc interface and present various statistical information through it. Also provide the functions for updating this information. These features are enabled by: CONFIG_FSCACHE_PROC CONFIG_FSCACHE_STATS CONFIG_FSCACHE_HISTOGRAM The /proc directory for FS-Cache is also exported so that caching modules can add their own statistics there too. The FS-Cache module is loadable at this point, and the statistics files can be examined by userspace: cat /proc/fs/fscache/stats cat /proc/fs/fscache/histogram Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
57 lines
2.1 KiB
Text
57 lines
2.1 KiB
Text
|
|
config FSCACHE
|
|
tristate "General filesystem local caching manager"
|
|
depends on EXPERIMENTAL
|
|
select SLOW_WORK
|
|
help
|
|
This option enables a generic filesystem caching manager that can be
|
|
used by various network and other filesystems to cache data locally.
|
|
Different sorts of caches can be plugged in, depending on the
|
|
resources available.
|
|
|
|
See Documentation/filesystems/caching/fscache.txt for more information.
|
|
|
|
config FSCACHE_STATS
|
|
bool "Gather statistical information on local caching"
|
|
depends on FSCACHE && PROC_FS
|
|
help
|
|
This option causes statistical information to be gathered on local
|
|
caching and exported through file:
|
|
|
|
/proc/fs/fscache/stats
|
|
|
|
The gathering of statistics adds a certain amount of overhead to
|
|
execution as there are a quite a few stats gathered, and on a
|
|
multi-CPU system these may be on cachelines that keep bouncing
|
|
between CPUs. On the other hand, the stats are very useful for
|
|
debugging purposes. Saying 'Y' here is recommended.
|
|
|
|
See Documentation/filesystems/caching/fscache.txt for more information.
|
|
|
|
config FSCACHE_HISTOGRAM
|
|
bool "Gather latency information on local caching"
|
|
depends on FSCACHE && PROC_FS
|
|
help
|
|
This option causes latency information to be gathered on local
|
|
caching and exported through file:
|
|
|
|
/proc/fs/fscache/histogram
|
|
|
|
The generation of this histogram adds a certain amount of overhead to
|
|
execution as there are a number of points at which data is gathered,
|
|
and on a multi-CPU system these may be on cachelines that keep
|
|
bouncing between CPUs. On the other hand, the histogram may be
|
|
useful for debugging purposes. Saying 'N' here is recommended.
|
|
|
|
See Documentation/filesystems/caching/fscache.txt for more information.
|
|
|
|
config FSCACHE_DEBUG
|
|
bool "Debug FS-Cache"
|
|
depends on FSCACHE
|
|
help
|
|
This permits debugging to be dynamically enabled in the local caching
|
|
management module. If this is set, the debugging output may be
|
|
enabled by setting bits in /sys/modules/fscache/parameter/debug.
|
|
|
|
See Documentation/filesystems/caching/fscache.txt for more information.
|