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SubjectRe: [RFC PATCH] Add Kconfig option for default swappiness
On Sun, 31 Oct 2010, Ben Gamari wrote:

> This will allow distributions to tune this important vm parameter in a more
> self-contained manner.
>
> Signed-off-by: Ben Gamari <bgamari.foss@gmail.com>
> ---
> Documentation/sysctl/vm.txt | 2 +-
> mm/Kconfig | 11 +++++++++++
> mm/vmscan.c | 2 +-
> 3 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
> index 6c7d18c..792823b 100644
> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -614,7 +614,7 @@ This control is used to define how aggressive the kernel will swap
> memory pages. Higher values will increase agressiveness, lower values
> decrease the amount of swap.
>
> -The default value is 60.
> +The default value is 60 (changed with CONFIG_DEFAULT_SWAPINESS).
>
> ==============================================================
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 9c61158..729ecec 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -61,6 +61,17 @@ config SPARSEMEM_MANUAL
>
> endchoice
>
> +config DEFAULT_SWAPPINESS
> + int "Default swappiness"
> + default "60"
> + range 0 100
> + help
> + This control is used to define how aggressive the kernel will swap
> + memory pages. Higher values will increase agressiveness, lower
> + values decrease the amount of swap. Valid values range from 0 to 100.
> +
> + If unsure, keep default value of 60.
> +

Perhaps this help text should mention the fact that swapiness setting can
be changed at runtime (regardless of the set default) by writing to
/proc/sys/vm/swappiness ???


--
Jesper Juhl <jj@chaosbits.net> http://www.chaosbits.net/
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