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a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=GuY5gsdr9MwsYxRlPWUA:9 X-Proofpoint-GUID: SUIj37OWzoiD5esOy6-25CVXPZWYZ2pa X-Proofpoint-ORIG-GUID: SUIj37OWzoiD5esOy6-25CVXPZWYZ2pa X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIxMDE1NSBTYWx0ZWRfX5v5poYsFAGyP ze4aP/bkg+XHWBXgV76eWhVeOUi5oCN/mjfYcnGB0+ChAU/vWwRPUCPAaq6+lq+kKLhFyWZFo1A c9PCrn0udR1ztPvi7P1jYwYKFm4PGidZYmkKYC0SPIHEAva6wD2I2kBH2yyOfJOc6N7lzp6uIfk hRmAdmI7uRrHjwnbcC9c27yYHwzPyxJFu0z2/8RW6siNwlpLWzEhXUSNx6BmZzGm0daztooCgBS Z+ra2W3FV2/tZDDTWeiqZ0zmK9nPiKFQlqgSTGnqcL+E2UDmy7oaxv+r6ZFElwrif/h/uH1XGsW oDrLFnPgt4ym2dguPcqexGDZSa+JHk968f0ZsR4yfcx4jQY0NDJ2HFs2+YK5fJu2VtE2ogHc96o wjIBe2xoS08utKhGpScoypJrofhXymCj7C8tjwAXyoHUvliqFXFb41jnMT6IH8XqQ+vnu1r5 Content-Type: text/plain; charset="utf-8" Check that moving a range of VMAs where we are offset into the first and last VMAs works correctly. This results in the VMAs being split at these points at which we are offset into VMAs. We explicitly test both the ordinary MREMAP_FIXED multi VMA move case and the MREMAP_DONTUNMAP multi VMA move case. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/mremap_test.c | 127 ++++++++++++++++++++++- 1 file changed, 126 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selft= ests/mm/mremap_test.c index d3b4772cd8c9..fccf9e797a0c 100644 --- a/tools/testing/selftests/mm/mremap_test.c +++ b/tools/testing/selftests/mm/mremap_test.c @@ -610,6 +610,129 @@ static void mremap_shrink_multiple_vmas(unsigned long= page_size, inplace ? " [inplace]" : ""); } =20 +static void mremap_move_multiple_vmas_split(unsigned int pattern_seed, + unsigned long page_size, + bool dont_unmap) +{ + char *test_name =3D "mremap move multiple vmas split"; + int mremap_flags =3D MREMAP_FIXED | MREMAP_MAYMOVE; + const size_t size =3D 10 * page_size; + bool success =3D true; + char *ptr, *tgt_ptr; + int i; + + if (dont_unmap) + mremap_flags |=3D MREMAP_DONTUNMAP; + + ptr =3D mmap(NULL, size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON, -1, 0); + if (ptr =3D=3D MAP_FAILED) { + perror("mmap"); + success =3D false; + goto out; + } + + tgt_ptr =3D mmap(NULL, size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON, -1, 0); + if (tgt_ptr =3D=3D MAP_FAILED) { + perror("mmap"); + success =3D false; + goto out; + } + if (munmap(tgt_ptr, size)) { + perror("munmap"); + success =3D false; + goto out_unmap; + } + + /* + * Unmap so we end up with: + * + * 0 1 2 3 4 5 6 7 8 9 10 offset in buffer + * |**********| |*******| + * |**********| |*******| + * 0 1 2 3 4 5 6 7 8 9 pattern offset + */ + if (munmap(&ptr[5 * page_size], page_size)) { + perror("munmap"); + success =3D false; + goto out_unmap; + } + + /* Set up random patterns. */ + srand(pattern_seed); + for (i =3D 0; i < 10; i++) { + int j; + char *buf =3D &ptr[i * page_size]; + + if (i =3D=3D 5) + continue; + + for (j =3D 0; j < page_size; j++) + buf[j] =3D rand(); + } + + /* + * Move the below: + * + * <-------------> + * 0 1 2 3 4 5 6 7 8 9 10 offset in buffer + * |**********| |*******| + * |**********| |*******| + * 0 1 2 3 4 5 6 7 8 9 pattern offset + * + * Into: + * + * 0 1 2 3 4 5 6 7 offset in buffer + * |*****| |*****| + * |*****| |*****| + * 2 3 4 5 6 7 pattern offset + */ + if (mremap(&ptr[2 * page_size], size - 3 * page_size, size - 3 * page_siz= e, + mremap_flags, tgt_ptr) =3D=3D MAP_FAILED) { + perror("mremap"); + success =3D false; + goto out_unmap; + } + + /* Offset into random pattern. */ + srand(pattern_seed); + for (i =3D 0; i < 2 * page_size; i++) + rand(); + + /* Check pattern. */ + for (i =3D 0; i < 7; i++) { + int j; + char *buf =3D &tgt_ptr[i * page_size]; + + if (i =3D=3D 3) + continue; + + for (j =3D 0; j < page_size; j++) { + char chr =3D rand(); + + if (chr !=3D buf[j]) { + ksft_print_msg("page %d offset %d corrupted, expected %d got %d\n", + i, j, chr, buf[j]); + goto out_unmap; + } + } + } + +out_unmap: + if (munmap(tgt_ptr, size)) + perror("munmap tgt"); + if (munmap(ptr, size)) + perror("munmap src"); +out: + if (success) + ksft_test_result_pass("%s%s\n", test_name, + dont_unmap ? " [dontunnmap]" : ""); + else + ksft_test_result_fail("%s%s\n", test_name, + dont_unmap ? " [dontunnmap]" : ""); +} + /* Returns the time taken for the remap on success else returns -1. */ static long long remap_region(struct config c, unsigned int threshold_mb, char *rand_addr) @@ -951,7 +1074,7 @@ int main(int argc, char **argv) char *rand_addr; size_t rand_size; int num_expand_tests =3D 2; - int num_misc_tests =3D 6; + int num_misc_tests =3D 8; struct test test_cases[MAX_TEST] =3D {}; struct test perf_test_cases[MAX_PERF_TEST]; int page_size; @@ -1082,6 +1205,8 @@ int main(int argc, char **argv) mremap_shrink_multiple_vmas(page_size, /* inplace=3D */false); mremap_move_multiple_vmas(pattern_seed, page_size, /* dontunmap=3D */ fal= se); mremap_move_multiple_vmas(pattern_seed, page_size, /* dontunmap=3D */ tru= e); + mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap=3D = */ false); + mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap=3D = */ true); =20 if (run_perf_tests) { ksft_print_msg("\n%s\n", --=20 2.50.1