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 xsFUW30F 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In order to do so, we have to account for the fact the pagemap interface checks soft dirty PTEs and additionally that newly merged VMAs are marked VM_SOFTDIRTY. To account for this we use unfaulted anon VMAs, mapping one VMA in and clearing soft-dirty, then another separate from the first which will be marked soft-dirty which we then mremap() into place. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/soft-dirty.c | 51 ++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selftests/mm/soft-dirty.c index 4ee4db3750c1..bb29edb1e2a3 100644 --- a/tools/testing/selftests/mm/soft-dirty.c +++ b/tools/testing/selftests/mm/soft-dirty.c @@ -184,6 +184,54 @@ static void test_mprotect(int pagemap_fd, int pagesize, bool anon) close(test_fd); } +static void test_merge(int pagemap_fd, int pagesize) +{ + char *reserved, *map, *map2; + + /* Reserve space. */ + reserved = mmap(NULL, 4 * pagesize, PROT_NONE, + MAP_ANON | MAP_PRIVATE, -1, 0); + if (reserved == MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + munmap(reserved, 4 * pagesize); + + /* Map a page. */ + map = mmap(&reserved[pagesize], pagesize, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map == MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* This will clear VM_SOFTDIRTY too. */ + clear_softdirty(); + + /* + * Now place a new mapping which will be marked VM_SOFTDIRTY. Away from + * map. + */ + map2 = mmap(&reserved[3 * pagesize], pagesize, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (map2 == MAP_FAILED) + ksft_exit_fail_msg("mmap failed\n"); + + /* + * Now remap it immediately adjacent to map, if the merge correctly + * propagates VM_SOFTDIRTY, we should then observe the VMA as a whole + * being marked soft-dirty. + */ + map2 = mremap(map2, pagesize, pagesize, MREMAP_FIXED | MREMAP_MAYMOVE, + &reserved[2 * pagesize]); + if (map2 == MAP_FAILED) + ksft_exit_fail_msg("mremap failed\n"); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1, + "Test %s-anon soft-dirty after merge 1st pg\n", + __func__); + ksft_test_result(pagemap_is_softdirty(pagemap_fd, map2) == 1, + "Test %s-anon soft-dirty after merge 2nd pg\n", + __func__); + + munmap(map, 2 * pagesize); +} + static void test_mprotect_anon(int pagemap_fd, int pagesize) { test_mprotect(pagemap_fd, pagesize, true); @@ -204,7 +252,7 @@ int main(int argc, char **argv) if (!softdirty_supported()) ksft_exit_skip("soft-dirty is not support\n"); - ksft_set_plan(15); + ksft_set_plan(17); pagemap_fd = open(PAGEMAP_FILE_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_msg("Failed to open %s\n", PAGEMAP_FILE_PATH); @@ -216,6 +264,7 @@ int main(int argc, char **argv) test_hugepage(pagemap_fd, pagesize); test_mprotect_anon(pagemap_fd, pagesize); test_mprotect_file(pagemap_fd, pagesize); + test_merge(pagemap_fd, pagesize); close(pagemap_fd); -- 2.51.0