Re: Page Colouring (was: 2.6.0 Huge pages not working as expected)

[Rusty Russell]

On Mon, 29 Dec 2003 02:23:19 -0800
William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:

> The fact merely elevating PAGE_SIZE breaks numerous things makes me
> rather suspicious of claims that minimalistic patches can do likewise.

Can you give an example?

	One approach is to simply present a larger page size to userspace w/
getpagesize().  This does break ELF programs which have been laid out assuming
the old page size (presumably they try to mprotect the read-only sections).
On PPC, the ELF ABI already insists on a 64k boundary between such sections,
and maybe for others you could simply round appropriately and pray, or do
fine-grained protections (ie. on real pagesize) for that one case.

Rusty.
-- 
   there are those who do and those who hang on and you don't see too
   many doers quoting their contemporaries.  -- Larry McVoy
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