Messages in this thread |  | | | Date | Tue, 18 Dec 2001 10:37:30 -0800 | | From | Wayne Whitney <> | | Subject | Re: How to use >3G memory per process |
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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. > [2] What need to be done at compilation time? Any option for > compiler/linker?
No changes are required in the method of compiling the kernel. As for your application, no changes should be required, although I am not familiar with libhoard.
Note that this change increases the mmap() region of user space, but since you are speak of using malloc() and/or libhoard, that should be sufficient for your purposes. With __PAGE_OFFSET set to 0xE0000000, your program should have (3.5GB - 2 * Program Size - Stack Size) of usable address space. Cheers, Wayne
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