On Wed, Jun 13, 2018 at 05:50:24PM +0000, Dave Hansen wrote: > On 06/12/2018 07:39 AM, Kirill A. Shutemov wrote: > > Pages for encrypted VMAs have to be allocated in a special way: > > we would need to propagate down not only desired NUMA node but also > > whether the page is encrypted. > > > > It complicates not-so-trivial routine of huge page allocation in > > khugepaged even more. It also puts more pressure on page allocator: > > we cannot re-use pages allocated for encrypted VMA to collapse > > page in unencrypted one or vice versa. > > > > I think for now it worth skipping encrypted VMAs. We can return > > to this topic later. > > You're asking for this to be included, but without a major piece of THP > support. Is THP support unimportant for this feature? > > Are we really asking the x86 maintainers to merge this feature with this > restriction in place? I gave it more thought after your comment and I think I see a way to get khugepaged work with memory encryption. Let me check it tomorrow. -- Kirill A. Shutemov
