On Tue, Jul 02, 2024 at 02:02:50PM +0200, Christoph Hellwig wrote: > On Tue, Jul 02, 2024 at 10:15:56AM +0000, Pankaj Raghav (Samsung) wrote: > > Willy suggested we could use raw pages as we don't need the metadata > > from using a folio. [0] > > Ok, that feels weird but I'll defer to his opinion in that case. Let me see if I can make you feel less weird about it, since I think this is something that people should have a clear feeling about. In the Glorious Future, when we've separated pages and folios from each other, folios are conceptually memory that gets mapped to userspace. They have refcounts, mapcounts, a pointer to a file's mapping or an anon vma's anon_vma, an index within that object, an LRU list, a dirty flag, a lock bit, and so on. We don't need any of that here. We might choose to use a special memdesc for accounting purposes, but there's no need to allocate a folio for it. For now, leaving it as a plain allocation of pages seems like the smartest option, and we can revisit in the future.
