There's 2 different memory models - the NT mode we use currently
is contiguous, the PTX mode is discontiguous. I don't think it's
as simple as a 512Mb fixed size hole, though I'd have to look it
up to be sure.
>> At the moment I use the contig memory model (so we only use discontig for
>> NUMA support) but I may need to change that in the future.
> I wasn't thinking at numa-q, but regardless numa-Q fits perfectly into
> the current discontigmem-numa model too as far I can see.
As Dan already mentioned, we need CONFIG_NONLINEAR to spread
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