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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 From nobody Mon Oct 6 11:55:36 2025 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C34A29E0F4 for ; 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Mon, 21 Jul 2025 17:34:11 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: "Liam R . Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] tools/testing/selftests: test MREMAP_DONTUNMAP on multiple VMA move Date: Mon, 21 Jul 2025 18:33:26 +0100 Message-ID: X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO2P265CA0157.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:9::25) 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: ff54dd4d-7d6a-4c50-5750-08ddc87cce39 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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a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=3iKSiHUcCLKKygD1IVYA:9 cc=ntf awl=host:13600 X-Proofpoint-GUID: Z9KBzHquXy0lrpDd2iEi4PpskuHartF7 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIxMDE1NSBTYWx0ZWRfX+QwlhXL5X+/3 dkOx1zubuXwLZIONzXOoI3gST6xq5FhjR0FLWXiB3wKYGafC2K8sH+FCJW85HSz1/VmhuKRpo/g w3E+KQxpOHuvRHuboXnEj1IEJOFqQ/XVTifQffaNgNs5UAxFNQL6rR91Ycj+VrHZ7cEUI4Ov0a4 mK4B9Q9CptLKJT07VABB8xz7xXAlrPqtAN62O2/EJ6wh0WoOx4eSyyOIT7aFM8zLqDSeLQsIqnb 11JJYx+OyzRKw3AkeUlEgosualE/tkTVRgUdBddAm9oUO/bBha0M8gEisuw4uoD1uQgdp60oYyk hmpekdCM/Z63YSaFZh9JjD13sQ5yrJ1j5m4XAtYBr8tS9xKUCNtekFw+6ZWzlKJuWcSegiVkJHV 4nqXeMtoTI8raxqcK2UZFTOKbWsr9d4eXAM5Kmu6SV60I5s3YDyzfh67NNw6YViRLoIYI5YQ X-Proofpoint-ORIG-GUID: Z9KBzHquXy0lrpDd2iEi4PpskuHartF7 Content-Type: text/plain; charset="utf-8" We support MREMAP_MAYMOVE | MREMAP_FIXED | MREMAP_DONTUNMAP for moving multiple VMAs via mremap(), so assert that the tests pass with both MREMAP_DONTUNMAP set and not set. Additionally, add success =3D false settings when mremap() fails. This is something that cannot realistically happen, so in no way impacted test outcome, but it is incorrect to indicate a test pass when something has failed. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/mremap_test.c | 29 ++++++++++++++++-------- 1 file changed, 19 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selft= ests/mm/mremap_test.c index 141a9032414e..d3b4772cd8c9 100644 --- a/tools/testing/selftests/mm/mremap_test.c +++ b/tools/testing/selftests/mm/mremap_test.c @@ -406,14 +406,19 @@ static bool is_multiple_vma_range_ok(unsigned int pat= tern_seed, } =20 static void mremap_move_multiple_vmas(unsigned int pattern_seed, - unsigned long page_size) + unsigned long page_size, + bool dont_unmap) { + int mremap_flags =3D MREMAP_FIXED | MREMAP_MAYMOVE; char *test_name =3D "mremap move multiple vmas"; const size_t size =3D 11 * page_size; bool success =3D true; char *ptr, *tgt_ptr; int i; =20 + 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) { @@ -467,8 +472,7 @@ static void mremap_move_multiple_vmas(unsigned int patt= ern_seed, } =20 /* First, just move the whole thing. */ - if (mremap(ptr, size, size, - MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr) =3D=3D MAP_FAILED) { + if (mremap(ptr, size, size, mremap_flags, tgt_ptr) =3D=3D MAP_FAILED) { perror("mremap"); success =3D false; goto out_unmap; @@ -480,9 +484,10 @@ static void mremap_move_multiple_vmas(unsigned int pat= tern_seed, } =20 /* Move next to itself. */ - if (mremap(tgt_ptr, size, size, - MREMAP_MAYMOVE | MREMAP_FIXED, &tgt_ptr[size]) =3D=3D MAP_FAILED) { + if (mremap(tgt_ptr, size, size, mremap_flags, + &tgt_ptr[size]) =3D=3D MAP_FAILED) { perror("mremap"); + success =3D false; goto out_unmap; } /* Check that the move is ok. */ @@ -500,8 +505,9 @@ static void mremap_move_multiple_vmas(unsigned int patt= ern_seed, } /* Move and overwrite. */ if (mremap(&tgt_ptr[size], size, size, - MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr) =3D=3D MAP_FAILED) { + mremap_flags, tgt_ptr) =3D=3D MAP_FAILED) { perror("mremap"); + success =3D false; goto out_unmap; } /* Check that the move is ok. */ @@ -518,9 +524,11 @@ static void mremap_move_multiple_vmas(unsigned int pat= tern_seed, =20 out: if (success) - ksft_test_result_pass("%s\n", test_name); + ksft_test_result_pass("%s%s\n", test_name, + dont_unmap ? " [dontunnmap]" : ""); else - ksft_test_result_fail("%s\n", test_name); + ksft_test_result_fail("%s%s\n", test_name, + dont_unmap ? 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Mon, 21 Jul 2025 17:34:15 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: "Liam R . Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] tools/testing/selftests: explicitly test split multi VMA mremap move Date: Mon, 21 Jul 2025 18:33:27 +0100 Message-ID: X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0514.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:272::21) 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: 95906a7a-8190-4470-6188-08ddc87cd075 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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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