> These should be all __cpuinit.
>
> In general SRAT has a hotplug memory bit so it's possible
> to predict how much memory there will be in advance. Since
> the overhead of the kernel page tables should be very
> low I would prefer if you just used instead.
How much overhead would there be?
> (i.e. instead of extending the kernel mapping preallocate
> the direct mapping and just clear the P bits)
On my box the SRAT for hot-add areas exposed are from the end
installed memory to way out in outerspace.
SRAT: hot plug zone found 280000000 - 2300000000
I can't hot add that sort of range on my box but the bios didn't want
to limit or is planing for really really big dimms.
I wouldn't want to waste resource for areas that will never be added.
Thanks,
Keith
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