Re: [PATCH 34/40] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT_ENABLED

[Rik van Riel]

On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
> Add the config options to allow building the kernel with AutoNUMA.
>
> If CONFIG_AUTONUMA_DEFAULT_ENABLED is "=y", then
> /sys/kernel/mm/autonuma/enabled will be equal to 1, and AutoNUMA will
> be enabled automatically at boot.
>
> CONFIG_AUTONUMA currently depends on X86, because no other arch
> implements the pte/pmd_numa yet and selecting =y would result in a
> failed build, but this shall be relaxed in the future. Porting
> AutoNUMA to other archs should be pretty simple.
>
> Signed-off-by: Andrea Arcangeli<aarcange@xxxxxxxxxx>

The Makefile changes could be merged into this patch

> diff --git a/mm/Kconfig b/mm/Kconfig
> index 82fed4e..330dd51 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -207,6 +207,19 @@ config MIGRATION
>   	  pages as migration can relocate pages to satisfy a huge page
>   	  allocation instead of reclaiming.
>
> +config AUTONUMA
> +	bool "Auto NUMA"
> +	select MIGRATION
> +	depends on NUMA&&  X86

How about having the x86 architecture export a
HAVE_AUTONUMA flag, and testing for that?

> +	help
> +	  Automatic NUMA CPU scheduling and memory migration.

This could be expanded to list advantages and
disadvantages of having autonuma enabled.

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