[TUHS] /dev/drum

Ian Zimmerman itz at very.loosely.org
Thu Apr 26 00:33:05 AEST 2018

On 2018-04-25 08:18, Ronald Natalie wrote:

> The fun argument is what is Virtual Memory.  Typically, people align
> that with paging but you can stretch the definition to cover paging.
> This was a point of contention in the early VAX Unix days as the ATT
> (System III, even V?) didn’t support paging on the VAX where as BSD
> did.  Our comment was that “It ain’t VIRTUAL memory if it isn’t all
> there” as opposed to virtual addressing.

What about overlays?  Virtual or not?

The main difference may be where the code lives which brings non-present
address space back into directly addressable state: in the kernel (and
where: in an interrupt handler or higher up) or in userspace.

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