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authorDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
committerDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
commit7394daa8c61dfda4baa687f133748fa0b599b017 (patch)
tree32d2c55ed60596918ec62ce6ecca186337bf4660 /fs/fscache/Kconfig
parent06b3db1b9bccdc8c2c743122a89745279e5ecc46 (diff)
downloadlinux-7394daa8c61dfda4baa687f133748fa0b599b017.tar.bz2
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/Kconfig34
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