Sorry, I screwed up when sending it out. It's not [1/2], it's supposed to be a stand-alone patch. IOW, don't expect a [2/2] followup :)

On Fri, Dec 29, 2023 at 6:56 PM Suren Baghdasaryan surenb@google.com wrote:

Add a test for UFFDIO_MOVE ioctl operating on a hugepage which has to be split because destination is marked with MADV_NOHUGEPAGE. With this we cover all 3 cases: normal page move, hugepage move, hugepage splitting before move.

Signed-off-by: Suren Baghdasaryan surenb@google.com

Patch applies over mm-unstable.

tools/testing/selftests/mm/uffd-unit-tests.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index d8091523c2df..cce90a10515a 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -1199,6 +1199,16 @@ static void uffd_move_test(uffd_test_args_t *targs)

static void uffd_move_pmd_test(uffd_test_args_t *targs) {

•   if (madvise(area_dst, nr_pages * page_size, MADV_HUGEPAGE))
  

•           err("madvise(MADV_HUGEPAGE) failure");
  

•   uffd_move_test_common(targs, read_pmd_pagesize(),
  

•                         uffd_move_pmd_handle_fault);
  

+}

+static void uffd_move_pmd_split_test(uffd_test_args_t *targs) +{

•   if (madvise(area_dst, nr_pages * page_size, MADV_NOHUGEPAGE))
  

•           err("madvise(MADV_NOHUGEPAGE) failure");
    uffd_move_test_common(targs, read_pmd_pagesize(),
                          uffd_move_pmd_handle_fault);
  

} @@ -1330,6 +1340,13 @@ uffd_test_case_t uffd_tests[] = { .uffd_feature_required = UFFD_FEATURE_MOVE, .test_case_ops = &uffd_move_test_pmd_case_ops, },

•   {
  

•           .name = "move-pmd-split",
  

•           .uffd_fn = uffd_move_pmd_split_test,
  

•           .mem_targets = MEM_ANON,
  

•           .uffd_feature_required = UFFD_FEATURE_MOVE,
  

•           .test_case_ops = &uffd_move_test_pmd_case_ops,
  

•   },
    {
            .name = "wp-fork",
            .uffd_fn = uffd_wp_fork_test,
  

-- 2.34.1