On Fri, Feb 07, 2025 at 03:57:45AM -0500, Gregory Price wrote: > On Fri, Feb 07, 2025 at 04:20:24PM +0900, Byungchul Park wrote: > > My thoughts here are that memory tiering is the wrong tool for the > problem you are trying to solve. > > Maybe there's a world in which we propose a ZONE_MEMDESC which is > exclusively used for `struct page` for a node. > > At least then you could design CXL capacities *around* that. > Dumb question time Is this maybe not an entirely horrible idea? Even at 16-byte page structs we use 4GB-per-1TB of capacity. Maybe a memory device providing additional capacity SHOULD be made (given the option?) to service its own struct pages - but maintain some control over hot-plug-ability? At least it could tear down all the ZONE_MOVABLE regions and finally release the MEMDESC region when finished. Seems too obvious to have not been proposed already. :shrug: ~Gregory
