On Tue, Jul 23, 2024 at 11:36:51PM +0200, David Hildenbrand wrote: > I wonder if we could just let relevant users do the PAT handling manually: > I'm also not sure how many remap_pfn_range users end up triggering VM_PAT > code although they don't really have to (just because they happen to cover a > full VMA)? > > One nasty thing is fork(), I was wondering if relevant users really rely on > that or if we could force these VMAs to simply not get copied during fork. > During fork() we have to "duplicate" the reservation ... I admit I barely understand what x86 uses this PAT stuff for - allowing WC mappings is part of it? If yes, then RDMA would expect WC PFN MAP VMAs to copy their WCness during fork.. Jason
