Re: broken VM in 2.4.10-pre9

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

> On September 20, 2001 12:04 am, Alan Cox wrote:
> > Reverse mappings make linear aging easier to do but are not critical (we
> > can walk all physical pages via the page map array).
>
> But you can't pick up the referenced bit that way, so no up aging, only
> down.

#1 If you really wanted to you could update a referenced bit in the page
struct in the fault handling path.

#2 If a page is referenced multiple times by different processes is the
behaviour of multiple upward aging actually wrong.

Alan

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