linux-kernel - Re: [PATCH] change CONFIG

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Date:	Thu, 6 Nov 2008 12:15:06 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH] change CONFIG_NUMA description

Hi Ingo,

On Thu, Nov 6, 2008 at 10:53 AM, Ingo Molnar <mingo@...e.hu> wrote:
> From fd51b2d7d5df932767b89e00d0871a38a2c53e74 Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Wed, 5 Nov 2008 02:27:19 +0900
> Subject: [PATCH] x86: update CONFIG_NUMA description
>
> Impact: clarify/update CONFIG_NUMA text
>
> CONFIG_NUMA description talk about a bit old thing.
> So, following changes are better.
>
>  o CONFIG_NUMA is no longer EXPERIMENTAL
>
>  o Opteron is not the only processor of NUMA topology on x86_64 no longer,
>   but also Intel Core7i has it.
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  arch/x86/Kconfig |   16 ++++++++++------
>  1 files changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 350bee1..38ae04b 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -951,22 +951,26 @@ config ARCH_PHYS_ADDR_T_64BIT
>
>  # Common NUMA Features
>  config NUMA
> -       bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
> +       bool "Numa Memory Allocation and Scheduler Support"
>        depends on SMP
>        depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)

Why does this depend on CONFIG_EXPERIMENTAL still?

>        default n if X86_PC
>        default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
>        help
>          Enable NUMA (Non Uniform Memory Access) support.
> +
>          The kernel will try to allocate memory used by a CPU on the
>          local memory controller of the CPU and add some more
>          NUMA awareness to the kernel.
>
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