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SubjectRe: How to use >3G memory per process
Date
Followup to:  <200112181837.fBIIbUF02685@adsl-209-76-109-63.dsl.snfc21.pacbell.net>
By author: Wayne Whitney <whitney@math.berkeley.edu>
In newsgroup: linux.dev.kernel
>
> In mailing-lists.linux-kernel, you wrote:
>
> > [1] What need to be done for the kernel to support 3.5G or more user
> > address space per process?
>
> On ia32, change the value of __PAGE_OFFSET (where kernel space starts)
> in include/asm-i386/page.h. The size of kernel space must be a power
> of 2, so you can change __PAGE_OFFSET from its default of 0xC0000000
> to either 0xE0000000 (reasonable) or 0xF0000000 (overboard ?).
> You must also change the unlabeled value near the top of
> arch/i386/vmlinux.lds to match the value of __PAGE_OFFSET.
>

Note that this does break the (old) initrd protocol. Compile your
kernel monolithic.

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
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