Re: What to expect with the 2.6 VM

Martin J. Bligh
2003-07-02T17:52:42Z

--On Wednesday, July 02, 2003 19:47:00 +0200 Andrea Arcangeli <andrea@suse.de> wrote:

> On Wed, Jul 02, 2003 at 10:10:09AM -0700, Martin J. Bligh wrote:
>> Maybe I'm just taking this out of context, and it's twisting my brain,
>> but as far as I know, the nonlinear vma's *are* backed by pte_chains.
>> That was the whole problem with objrmap having to do conversions, etc.
>>
>> Am I just confused for some reason? I was pretty sure that was right ...
>
> you're right:
>
> int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
> unsigned long addr, struct page *page, pgprot_t prot)
> [..]
> flush_icache_page(vma, page);
> set_pte(pte, mk_pte(page, prot));
> pte_chain = page_add_rmap(page, pte, pte_chain);
> pte_unmap(pte);
> [..]
>
> (this make me understand better some of the arguments in the previous
> emails too ;)

OK, nice to know I haven't totally lost it ;-)

> So ether we declare 32bit archs obsolete in production with 2.6, or we
> drop rmap behind remap_file_pages.

Indeed - if we could memlock it, it'd be OK to drop that stuff. Would
make everything a lot simpler.

M.