On Mon 02-07-18 15:33:50, Kirill A. Shutemov wrote: [...] > I probably miss the explanation somewhere, but what's wrong with allowing > other thread to re-populate the VMA? We have discussed that earlier and it boils down to how is racy access to munmap supposed to behave. Right now we have either the original content or SEGV. If we allow to simply madvise_dontneed before real unmap we could get a new page as well. There might be (quite broken I would say) user space code that would simply corrupt data silently that way. -- Michal Hocko SUSE Labs
