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Message-ID: <20231230025636.2477429-1-surenb@google.com> Date: Fri, 29 Dec 2023 18:56:36 -0800 From: Suren Baghdasaryan <surenb@...gle.com> To: akpm@...ux-foundation.org Cc: viro@...iv.linux.org.uk, brauner@...nel.org, shuah@...nel.org, aarcange@...hat.com, lokeshgidra@...gle.com, peterx@...hat.com, david@...hat.com, ryan.roberts@....com, hughd@...gle.com, mhocko@...e.com, axelrasmussen@...gle.com, rppt@...nel.org, willy@...radead.org, Liam.Howlett@...cle.com, jannh@...gle.com, zhangpeng362@...wei.com, bgeffon@...gle.com, kaleshsingh@...gle.com, ngeoffray@...gle.com, jdduke@...gle.com, surenb@...gle.com, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, kernel-team@...roid.com Subject: [PATCH 1/2] selftests/mm: add separate UFFDIO_MOVE test for PMD splitting 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@...gle.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
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