James, On Fri, Oct 21, 2022 at 04:36:50PM +0000, James Houghton wrote: > + bool use_hgm = uffd_ctx_has_hgm(&dst_vma->vm_userfaultfd_ctx) && > + mode == MCOPY_ATOMIC_CONTINUE; Do you think in your new version use_hgm can work even for MISSING by default? I had a feeling that the major components are ready for that anyway. Then no matter how HGM is enabled (assuming it'll switch to MADV, or even one can just register with MISSING+MINOR and enable the uffd HGM feature), an existing MISSING only app can easily switch to HGM support if it's on huge pages. Thanks, -- Peter Xu
