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Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] tools/testing/selftests: add mremap() shrink test for multiple VMAs Date: Mon, 21 Jul 2025 18:33:25 +0100 Message-ID: X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0133.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:193::12) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|PH0PR10MB4518:EE_ X-MS-Office365-Filtering-Correlation-Id: 3f046ffe-ff97-478a-0351-08ddc87ccc04 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: 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L/tLOLOb9xehT5fjyZRcWehtcBLASuio4k4CjJ+IcRZf7xDyDdbG6vJOvV7S7PoSWWRPhtsm3Zt LFICTLoIr/P48I1B0YkVFksIB5xXUH0Ea/yUlRaGuJV5cf85ReNP3XAqDkWoO/kLygVLHeTxRk1 181RTw0EgQOdrP/i93xBtAEqDlDbESfpFWXpalouKlW18iCwR1x0XU5rt8DOcBIpIApetqOA6zg gxggFZCi1nXrMYQWJcs6StiIHP5VwzQ5/4+EMugs0a5UEVu2ctYegFZMFe0uoHX5rj02nvIV X-Proofpoint-GUID: oWaAnXYEdkmmRXnzI-ctAerCbUX-t875 X-Authority-Analysis: v=2.4 cv=IsYecK/g c=1 sm=1 tr=0 ts=687e7a15 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=w3ZyRhC76O03mK4guMEA:9 X-Proofpoint-ORIG-GUID: oWaAnXYEdkmmRXnzI-ctAerCbUX-t875 Content-Type: text/plain; charset="utf-8" There is a an apparently little-known feature of mremap() whereby, in stark contrast to other modes (other than the recently introduced capacity to move multiple VMAs), the input source range span multiple VMAs with gaps between. This is, when shrinking a VMA, whether moving it or not, and the shrink would reduce the range to a single VMA - this is permitted, as the shrink is actioned by an unmap. This patch adds tests to assert that this behaves as expected. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/mremap_test.c | 83 +++++++++++++++++++++++- 1 file changed, 82 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selft= ests/mm/mremap_test.c index 0a49be11e614..141a9032414e 100644 --- a/tools/testing/selftests/mm/mremap_test.c +++ b/tools/testing/selftests/mm/mremap_test.c @@ -523,6 +523,85 @@ static void mremap_move_multiple_vmas(unsigned int pat= tern_seed, ksft_test_result_fail("%s\n", test_name); } =20 +static void mremap_shrink_multiple_vmas(unsigned long page_size, + bool inplace) +{ + char *test_name =3D "mremap shrink multiple vmas"; + const size_t size =3D 10 * page_size; + bool success =3D true; + char *ptr, *tgt_ptr; + void *res; + int i; + + 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 2 4 6 8 10 offset in buffer + * |*| |*| |*| |*| |*| |*| + * |*| |*| |*| |*| |*| |*| + */ + for (i =3D 1; i < 10; i +=3D 2) { + if (munmap(&ptr[i * page_size], page_size)) { + perror("munmap"); + success =3D false; + goto out_unmap; + } + } + + /* + * Shrink in-place across multiple VMAs and gaps so we end up with: + * + * 0 + * |*| + * |*| + */ + if (inplace) + res =3D mremap(ptr, size, page_size, 0); + else + res =3D mremap(ptr, size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED, + tgt_ptr); + + if (res =3D=3D MAP_FAILED) { + perror("mremap"); + success =3D false; + 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, + inplace ? " [inplace]" : ""); + else + ksft_test_result_fail("%s%s\n", test_name, + inplace ? " [inplace]" : ""); +} + /* 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) @@ -864,7 +943,7 @@ int main(int argc, char **argv) char *rand_addr; size_t rand_size; int num_expand_tests =3D 2; - int num_misc_tests =3D 3; + int num_misc_tests =3D 5; struct test test_cases[MAX_TEST] =3D {}; struct test perf_test_cases[MAX_PERF_TEST]; int page_size; @@ -992,6 +1071,8 @@ int main(int argc, char **argv) mremap_move_within_range(pattern_seed, rand_addr); mremap_move_1mb_from_start(pattern_seed, rand_addr); mremap_move_multiple_vmas(pattern_seed, page_size); + mremap_shrink_multiple_vmas(page_size, /* inplace=3D */true); + mremap_shrink_multiple_vmas(page_size, /* inplace=3D */false); =20 if (run_perf_tests) { ksft_print_msg("\n%s\n", --=20 2.50.1