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Date: Fri, 15 Nov 2002 10:33:49 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] swsuspend and CONFIG_DISCONTIGMEM=y
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At some point in the past, I wrote:
>> I'm not entirely sure either. Mostly I suspect that the deep arch
>> issues will be the tough ones, but things like this I can handle. =)

On Fri, Nov 15, 2002 at 07:09:25PM +0100, Pavel Machek wrote:
> Well, I'd really hate to do 64GB support for swsusp for i386. It would
> mean wider pointers in on-disk format and probably would not be
> exactly nice.
> 								Pavel

i386 is actually a poor cpu for numerical workloads due to the
design of its FPU, so the interest will likely be low there, but...

It looks like the struct pbe is storing a physical address in an
unsigned long; using page frame numbers instead of raw physical
addresses should at least catch 36-bit i386 and a substantial fraction
of PPC highmem (40-bit, so not all) with very little effort. A good
chunk of the VM's arch support address calculation API (if not all)
has been converted to pfn-based calculations already, so we're already
in very good shape, aside from a one-shot format change.


Bill
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