Re: [PATCH 10/13] x86: mm: Enable deferred struct page initialisation on x86-64

[Andrew Morton]

On Wed, 22 Apr 2015 18:07:50 +0100 Mel Gorman <mgorman@xxxxxxx> wrote:

> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -32,6 +32,7 @@ config X86
>  	select HAVE_UNSTABLE_SCHED_CLOCK
>  	select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
>  	select ARCH_SUPPORTS_INT128 if X86_64
> +	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT if X86_64 && NUMA

Put this in the "config X86_64" section and skip the "X86_64 &&"?

Can we omit the whole defer_meminit= thing and permanently enable the
feature?  That's simpler, provides better test coverage and is, we
hope, faster.

And can this be used on non-NUMA?  Presumably that won't speed things
up any if we're bandwidth limited but again it's simpler and provides
better coverage.
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