Hi,
Just a small typo in Kconfig below..
On 06/11/16 16:51, George Spelvin wrote:
>
> fs/Kconfig | 28 ++++++++
> fs/dcache.c | 207
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 231 insertions(+), 4 deletions(-)
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index b8fcb416..3b111b77 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -8,6 +8,34 @@ menu "File systems"
> config DCACHE_WORD_ACCESS
> bool
>
> +config L1_DCACHE_BITS
> + int "Dcache level-1 cache size (bits)"
> + range 0 20
> + default 0 if !EXPERT
> + default 0 if NUMA
> + default 10 if BASE_SMALL
> + default 13
> + help
> + The Linus kernel maintains a large cache of "dentries"
Linux
> + (directory entries) for the performance-critical task of
> + converting file names to inodes. This option enables a smaller
> + direct-mapped "level-1 cache" in front of the main dcache.
> +
> + (This software "dcache" is quite different from the CPU's data
> + cache, or "D-cache". Sorry for the confusingly similar names.)
> +
> + This option specifies the size of this cache, as a power of 2.
> + For example, 13 means 2^13 = 8192 entries in the L1 dcache.
> + Specify 0 to turn off the L1 dcache entirely.
> +
> + The cost of enabling this is one pointer per entry, plus a
> + small amount of code.
> +
> + This is an experimental feature which hopes to speed up
> + single-socket machines. On larger systems, the extra updates
> + generated by the L1 dcache probably cause too much cache-line
> + bouncing to be worth it.
> +
> if BLOCK
>
> source "fs/ext2/Kconfig"
--
~Randy
