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SubjectRe: [patch] x86: enable GBPAGES option by default
Oops, messed up Andi's email...

On Wed, Oct 22, 2008 at 12:33:16PM +0200, Nick Piggin wrote:
> DIRECT_GBPAGES was under DEBUG_KERNEL && EXPERIMENTAL and disabled by default.
> Turn it on by default and put it under EMBEDDED.
>
> Signed-off-by: Nick Piggin <npiggin@suse.de>
> ---
> Index: linux-2.6/arch/x86/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig
> +++ linux-2.6/arch/x86/Kconfig
> @@ -946,6 +946,15 @@ config X86_PAE
> config ARCH_PHYS_ADDR_T_64BIT
> def_bool X86_64 || X86_PAE
>
> +config DIRECT_GBPAGES
> + bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
> + default y
> + depends on X86_64
> + help
> + Allow the kernel linear mapping to use 1GB pages on CPUs that
> + support it. This can improve the kernel's performance a tiny bit by
> + reducing TLB pressure. If in doubt, say "Y".
> +
> # Common NUMA Features
> config NUMA
> bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
> Index: linux-2.6/arch/x86/Kconfig.debug
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig.debug
> +++ linux-2.6/arch/x86/Kconfig.debug
> @@ -114,18 +114,6 @@ config DEBUG_RODATA
> data. This is recommended so that we can catch kernel bugs sooner.
> If in doubt, say "Y".
>
> -config DIRECT_GBPAGES
> - bool "Enable gbpages-mapped kernel pagetables"
> - depends on DEBUG_KERNEL && EXPERIMENTAL && X86_64
> - help
> - Enable gigabyte pages support (if the CPU supports it). This can
> - improve the kernel's performance a tiny bit by reducing TLB
> - pressure.
> -
> - This is experimental code.
> -
> - If in doubt, say "N".
> -
> config DEBUG_RODATA_TEST
> bool "Testcase for the DEBUG_RODATA feature"
> depends on DEBUG_RODATA


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