Re: [PATCH ] VMSPLIT config options (with default config fixed)

From: "Jeff V. Merkey" <jmerkey@wolfmountaingroup.com>
To: Mark Lord <lkml@rtr.ca>
Cc: Jens Axboe <axboe@suse.de>, Linus Torvalds <torvalds@osdl.org>,
	Byron Stanoszek <gandalf@winds.org>, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH ]  VMSPLIT config options (with default config fixed)
Date: Tue, 10 Jan 2006 10:37:11 -0700	[thread overview]
Message-ID: <43C3F0C7.4080608@wolfmountaingroup.com> (raw)
In-Reply-To: <43C40803.2000106@rtr.ca>

Mark Lord wrote:

Looks good. I'll try this one.

Jeff

> Okay, fixed the ordering of the "default" lines
> so that the Kconfig actually works correctly.
>
> Best for Andrew to soak this one in -mm.
>
> Signed-off-by: Mark Lord <mlord@pobox.com>
>
> diff -u --recursive --new-file --exclude='.*' 
> linux-2.6.15/arch/i386/Kconfig linux/arch/i386/Kconfig
> --- linux-2.6.15/arch/i386/Kconfig 2006-01-02 22:21:10.000000000 -0500
> +++ linux/arch/i386/Kconfig 2006-01-10 12:02:40.000000000 -0500
> @@ -448,6 +448,43 @@
>
> endchoice
>
> +choice
> + depends on EXPERIMENTAL && !X86_PAE
> + prompt "Memory split"
> + default VMSPLIT_3G
> + help
> + Select the desired split between kernel and user memory.
> +
> + If the address range available to the kernel is less than the
> + physical memory installed, the remaining memory will be available
> + as "high memory". Accessing high memory is a little more costly
> + than low memory, as it needs to be mapped into the kernel first.
> + Note that increasing the kernel address space limits the range
> + available to user programs, making the address space there
> + tighter. Selecting anything other than the default 3G/1G split
> + will also likely make your kernel incompatible with binary-only
> + kernel modules.
> +
> + If you are not absolutely sure what you are doing, leave this
> + option alone!
> +
> + config VMSPLIT_3G
> + bool "3G/1G user/kernel split"
> + config VMSPLIT_3G_OPT
> + bool "3G/1G user/kernel split (for full 1G low memory)"
> + config VMSPLIT_2G
> + bool "2G/2G user/kernel split"
> + config VMSPLIT_1G
> + bool "1G/3G user/kernel split"
> +endchoice
> +
> +config PAGE_OFFSET
> + hex
> + default 0xB0000000 if VMSPLIT_3G_OPT
> + default 0x78000000 if VMSPLIT_2G
> + default 0x40000000 if VMSPLIT_1G
> + default 0xC0000000
> +
> config HIGHMEM
> bool
> depends on HIGHMEM64G || HIGHMEM4G
> diff -u --recursive --new-file --exclude='.*' 
> linux-2.6.15/include/asm-i386/page.h linux/include/asm-i386/page.h
> --- linux-2.6.15/include/asm-i386/page.h 2006-01-02 22:21:10.000000000 
> -0500
> +++ linux/include/asm-i386/page.h 2006-01-10 12:04:56.000000000 -0500
> @@ -110,10 +110,10 @@
> #endif /* __ASSEMBLY__ */
>
> #ifdef __ASSEMBLY__
> -#define __PAGE_OFFSET (0xC0000000)
> +#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
> #define __PHYSICAL_START CONFIG_PHYSICAL_START
> #else
> -#define __PAGE_OFFSET (0xC0000000UL)
> +#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
> #define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
> #endif
> #define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
> -
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