mfbaustx <[email protected]> wrote:
> >>> No. Your code may be only partially paged into RAM.
> >>> The same can happen for any mmaped data.
> That's what I thought I read. But then my question is: with
> on-demand paging, is it possible to have two processes partially
> paged?
Why shouldn't they be? The whole idea is having just /parts/ (hopefully the
ones in active use) in memory.
> Surely, it MUST be the case that any processes with
> overlapping logical address spaces must be paged coherently.
I don't know what this is supposed to mean...
> So,
> while on-demand "paging-in" allows for partial paging of a process,
> is it the case that, on a context switch, the user-space PTE's are
> completely erased (so that you get page-faults and can then on-demand
> page them in...)?
Each process has its own page tables, they don't get in each others
hair. And the page tables precisely manage making several processes get
access to the /same/ logical addresses, but at /different/ physical
addresses.
--
Dr. Horst H. von Brand User #22616 counter.li.org
Departamento de Informatica Fono: +56 32 2654431
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Casilla 110-V, Valparaiso, Chile Fax: +56 32 2797513
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