On Wed 31-05-17 15:39:22, Mike Rapoprt wrote: > > > On May 31, 2017 3:08:22 PM GMT+03:00, Michal Hocko <mho...@kernel.org> wrote: [...] > > From what Mike said a global disable THP for the whole process > >while the post-copy is in progress is a better solution anyway. > > For the CRIU usecase, disabling THP for a while and re-enabling > it back will do the trick, provided VMAs flags are not affected, > like in the patch you've sent. Moreover, we may even get away with > ioctl(UFFDIO_COPY) if it's overhead shows to be negligible. Still, > I believe that MADV_RESET_HUGEPAGE (or some better named) command has > the value on its own.
I would prefer if we could go the prctl if possible and add a new MADV_RESET_HUGEPAGE if there is really a usecase for it. -- Michal Hocko SUSE Labs
