Re: [RFC PATCH v2 0/8] mm: Hot page tracking and promotion infrastructure

[Gregory Price]

On Wed, Oct 22, 2025 at 10:09:50AM +0100, Jonathan Cameron wrote:
> 
> My gut feeling is the need to do dynamic NUMA nodes will not be driven
> but this but more by large scale fabrics (if that ever happens)
> and trade offs of host PA space vs QoS in the hardware.  Those
> trade offs might put memory with very different performance
> characteristics behind one window.
> 

I can't believe we live in a world where "We have to think about the
scenario where we actually need all 256 TB of 48-bit phys-addressing"
is not a tongue in cheek joke o_o

That's a paltry 2048 128GB DIMMs... and whatever monstrosity you have to
build to host it all but that's at least a fun engineering problem :V

Bring on the 128-bit CPUs!

What do we name those x86 registers though? Slap the E back on for ERAX?

> Meh. Let's suggest people burn host PA space for now.  If anyone hits
> that limit they can solve it (crosses fingers it's not my lot :)
> 

+1

~Gregory