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The userfaultfd stress test never tested private shmem, which I think was overlooked long due. Add it so it matches with uffd unit test and it'll cover all memory supported with the three memory types. Meanwhile, rename the memory types a bit. Considering shared mem is the major use case for both shmem / hugetlbfs, changing from: anon, hugetlb, hugetlb_shared, shmem To (with shmem-private added): anon, hugetlb, hugetlb-private, shmem, shmem-private Add the shmem-private to run_vmtests.sh too. Link: https://lkml.kernel.org/r/20230412164546.329355-1-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: David Hildenbrand <david@redhat.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Zach O'Keefe <zokeefe@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>