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Howlett" , Suren Baghdasaryan , Matthew Wilcox , David Hildenbrand , Pedro Falcato , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 09/10] tools/testing/selftests: have CoW self test use MREMAP_RELOCATE_ANON Date: Tue, 22 Apr 2025 09:09:28 +0100 Message-ID: <1f22d7db2700bf8b920998a6acd2b1cd0f0ddf7b.1745307301.git.lorenzo.stoakes@oracle.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: LO4P123CA0567.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:33b::20) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|SA2PR10MB4587:EE_ X-MS-Office365-Filtering-Correlation-Id: f89c7dac-2d88-426a-b8c8-08dd81751723 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info: 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U2FsdGVkX187Rf/35G9awy7xWBbAKeMb1z4qnMYHDxHugWN6tLtjvl8cf2DWh10HuHtD0bipcB/UKk0RRbVwwhMRy/0vl5wdvZSntoYUWXJMpvYX5IaHhjnsZ3ctsxb9mQjcWsDBSJTPPJxJWe3RNcTA115RJE2IEAJLAAH5BABLOn1M53mdbBtdtgwBNFAHFs2jeERyUnXqE1597S7bsM5DybSqbhIV7tRNlSEYdMTRg3VIIqxmLWls3h7Q6A4ZQQgJt6LTb8Ort2GnL4q4pVC5MoAbvJAh0i3rdliUgfn1aCiWMIG+czdKo+JbKsmKmFSBTrE9CzeQ7Hh7ZogSYHn0FRhlG21BGTORFAbeVvckXALdeph1dlJfWFw6bWeuMMU58G8CmW+5V4gTMT4hbfFZ8frM4mkktVH+3npcIHjFL4KjUB/pqiFKQ4BX2VZ020eU3JHs3Dou/mm3fzrlN5wOueBAOh5ACyQmqAx1N26MkJ8oU6ni+OBOcr95GE/3oHQsI924WP4iydYaY4VBTy0tyZ0W1yR4eB5Y4aUBp08HD7ihHBKAXhMeCry7Q4N79gNRey7nUZpQWpFunE1hU/7ULQcUwnRAjngp3+srZqY9S6UPnxofMCdogN+5Oc12HKEqbjioAMYpQCzJgKct/iAiNBYEejSlmjUl4jS8v0HeuwOQLxrijpq0voKoyK87eeFoUkkc1TGU1mFY95jGimPnkSmcsTawBK9eDw5HfGUzmeZ8xtHnA/U3x2Ndw7DZzMoDrG/eP07D4pr8Pq4jz5TJJeBMcU8rn1g5YRrUR4M/wMH86+Q/II024hP4LP9qO/1B8HQ8RcSu7Z0NJ9kv2ww+VS9CrsqIKIPJuL7scp6NDLjbD2NRyFDo+QJJuVRwTqNhs8fqOGpjXg4NQMKpINbXELDij6+9a6eLxPC/tX5iarMY2zMiUDqTC0uR4gZbIg00uQ9yOwfnMwDTVt5 WkI1a9tD 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paths and asserts that this behaves correctly. Add an additional set of tests to explicitly do so. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/cow.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/mm/cow.c b/tools/testing/selftests/mm/cow.c index b6cfe0a4b7df..1770ebc3aa13 100644 --- a/tools/testing/selftests/mm/cow.c +++ b/tools/testing/selftests/mm/cow.c @@ -793,13 +793,14 @@ enum thp_run { THP_RUN_SINGLE_PTE, THP_RUN_SINGLE_PTE_SWAPOUT, THP_RUN_PARTIAL_MREMAP, + THP_RUN_PARTIAL_MREMAP_RELOCATE_ANON, THP_RUN_PARTIAL_SHARED, }; static void do_run_with_thp(test_fn fn, enum thp_run thp_run, size_t thpsize) { char *mem, *mmap_mem, *tmp, *mremap_mem = MAP_FAILED; - size_t size, mmap_size, mremap_size; + size_t size, mmap_size, mremap_size, mremap_flags; int ret; /* For alignment purposes, we need twice the thp size. */ @@ -869,6 +870,7 @@ static void do_run_with_thp(test_fn fn, enum thp_run thp_run, size_t thpsize) size = pagesize; break; case THP_RUN_PARTIAL_MREMAP: + case THP_RUN_PARTIAL_MREMAP_RELOCATE_ANON: /* * Remap half of the THP. We need some new memory location * for that. @@ -880,8 +882,13 @@ static void do_run_with_thp(test_fn fn, enum thp_run thp_run, size_t thpsize) ksft_test_result_fail("mmap() failed\n"); goto munmap; } - tmp = mremap(mem + mremap_size, mremap_size, mremap_size, - MREMAP_MAYMOVE | MREMAP_FIXED, mremap_mem); + + mremap_flags = MREMAP_MAYMOVE | MREMAP_FIXED; + if (thp_run == THP_RUN_PARTIAL_MREMAP_RELOCATE_ANON) + mremap_flags |= MREMAP_RELOCATE_ANON; + + tmp = sys_mremap(mem + mremap_size, mremap_size, mremap_size, + mremap_flags, mremap_mem); if (tmp != mremap_mem) { ksft_test_result_fail("mremap() failed\n"); goto munmap; @@ -988,6 +995,13 @@ static void run_with_partial_mremap_thp(test_fn fn, const char *desc, size_t siz do_run_with_thp(fn, THP_RUN_PARTIAL_MREMAP, size); } +static void run_with_partial_mremap_relocate_anon_thp(test_fn fn, const char *desc, size_t size) +{ + ksft_print_msg("[RUN] %s ... with partially mremap(MREMAP_RELOCATE_ANON)'ed THP (%zu kB)\n", + desc, size / 1024); + do_run_with_thp(fn, THP_RUN_PARTIAL_MREMAP_RELOCATE_ANON, size); +} + static void run_with_partial_shared_thp(test_fn fn, const char *desc, size_t size) { ksft_print_msg("[RUN] %s ... with partially shared THP (%zu kB)\n", @@ -1181,6 +1195,7 @@ static void run_anon_test_case(struct test_case const *test_case) run_with_single_pte_of_thp(test_case->fn, test_case->desc, size); run_with_single_pte_of_thp_swap(test_case->fn, test_case->desc, size); run_with_partial_mremap_thp(test_case->fn, test_case->desc, size); + run_with_partial_mremap_relocate_anon_thp(test_case->fn, test_case->desc, size); run_with_partial_shared_thp(test_case->fn, test_case->desc, size); thp_pop_settings(); @@ -1204,7 +1219,7 @@ static int tests_per_anon_test_case(void) { int tests = 2 + nr_hugetlbsizes; - tests += 6 * nr_thpsizes; + tests += 7 * nr_thpsizes; if (pmdsize) tests += 2; return tests; -- 2.49.0