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Re: Moving mac68k to 8K pages?


On 2019/02/08 19:34, David Brownlee wrote:
On Fri, 8 Feb 2019 at 07:53, Martin Husemann <martin%duskware.de@localhost> wrote:

On Fri, Feb 08, 2019 at 04:40:29AM +0000, John Klos wrote:
Are there any good reasons to not switch mac68k to 8K pages, at very least
until someone gets around to rewriting the PMAP?

Haven't thought about it in detail but things to consider:
  - it wastes a bit of space on tiny memory machines
  - does it break binary comptability?

I would expect that the latter *should* be fine - based on history for
NetBSD/vax switching from 1k to 4k pages :)

How reasonable would it to make it a explicit kernel option for m68k -
defaulting to 8k, but settable to 4k specifically for low memory

PGSHIFT is not hardcoded into userland stuff unlike Linux ;-).
Binaries for mac68k (PGSHIFT = 12) work on amiga (PGSHIFT = 13),
and vice versa.


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