Re: [patch] remap-file-pages-2.5.63-A0

Linus Torvalds (
Mon, 3 Mar 2003 08:50:34 -0800 (PST)

On Mon, 3 Mar 2003, Ingo Molnar wrote:
> the attached patch, against BK-curr, is a preparation to make
> remap_file_pages() usable on swappable vmas as well. When 'swapping out'
> shared-named mappings the page offset is written into the pte.
> it takes one bit from the swap-type bits, otherwise it does not change the
> pte layout - so it should be easy to adapt any other architecture to this
> change as well. (this patch does not introduce the protection-bits-in-pte
> approach used in my previous patch.)

One question: Why?

What's wrong with just using the value we use now (0), and just
calculating the page from the vma/offset information? Why hide the offset
in the page tables, when there is no need for it?


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