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| author | David Howells | 2009-04-03 17:42:37 +0200 |
|---|---|---|
| committer | David Howells | 2009-04-03 17:42:37 +0200 |
| commit | 7394daa8c61dfda4baa687f133748fa0b599b017 (patch) | |
| tree | 32d2c55ed60596918ec62ce6ecca186337bf4660 /fs/fscache/Kconfig | |
| parent | FS-Cache: Add main configuration option, module entry points and debugging (diff) | |
| download | kernel-qcow2-linux-7394daa8c61dfda4baa687f133748fa0b599b017.tar.gz kernel-qcow2-linux-7394daa8c61dfda4baa687f133748fa0b599b017.tar.xz kernel-qcow2-linux-7394daa8c61dfda4baa687f133748fa0b599b017.zip | |
FS-Cache: Add use of /proc and presentation of statistics
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>
Diffstat (limited to 'fs/fscache/Kconfig')
| -rw-r--r-- | fs/fscache/Kconfig | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig index 7c7bccd5eee4..9bbb8ce7bea0 100644 --- a/fs/fscache/Kconfig +++ b/fs/fscache/Kconfig @@ -11,6 +11,40 @@ config FSCACHE 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 |