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. I 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. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index b7e2268dfc9a..601151678414 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -830,6 +830,8 @@ static bool hugepage_vma_check(struct vm_area_struct *vma) return false; if (is_vma_temporary_stack(vma)) return false; + if (vma_is_encrypted(vma)) + return false; return !(vma->vm_flags & VM_NO_KHUGEPAGED); } -- 2.16.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
