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[2003:d8:2f0e:2c00:d6bb:8859:fbbc:b8a9]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c3bf956sm16049440f8f.24.2025.08.04.07.33.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 Aug 2025 07:33:53 -0700 (PDT) Message-ID: <65660d5f-a856-4244-8a81-1359a03f16be@redhat.com> Date: Mon, 4 Aug 2025 16:33:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/7] mm/selftests: Fix split_huge_page_test failure on systems with 64KB page size To: Wei Yang , Aboorva Devarajan Cc: akpm@linux-foundation.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, donettom@linux.ibm.com, ritesh.list@gmail.com References: <20250729053403.1071807-1-aboorvad@linux.ibm.com> <20250729053403.1071807-5-aboorvad@linux.ibm.com> <20250804090410.of5xwrlker665bdp@master> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 292D6100006 X-Stat-Signature: cohmo91zdyu9anjkxj4ntxnorewb5epf X-HE-Tag: 1754318040-625327 X-HE-Meta: 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 YCmWiMyQ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 04.08.25 11:04, Wei Yang wrote: > On Tue, Jul 29, 2025 at 11:04:00AM +0530, Aboorva Devarajan wrote: >> From: Donet Tom >> >> The split_huge_page_test fails on systems with a 64KB base page size. >> This is because the order of a 2MB huge page is different: >> >> On 64KB systems, the order is 5. >> >> On 4KB systems, it's 9. >> >> The test currently assumes a maximum huge page order of 9, which is only >> valid for 4KB base page systems. On systems with 64KB pages, attempting >> to split huge pages beyond their actual order (5) causes the test to fail. >> >> In this patch, we calculate the huge page order based on the system's base >> page size. With this change, the tests now run successfully on both 64KB >> and 4KB page size systems. >> >> Fixes: fa6c02315f745 ("mm: huge_memory: a new debugfs interface for splitting THP tests") >> Reviewed-by: Dev Jain >> Reviewed-by: Zi Yan >> Co-developed-by: Aboorva Devarajan >> Signed-off-by: Aboorva Devarajan >> Signed-off-by: Donet Tom >> --- >> .../selftests/mm/split_huge_page_test.c | 23 ++++++++++++------- >> 1 file changed, 15 insertions(+), 8 deletions(-) >> >> diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c >> index 05de1fc0005b..718daceb5282 100644 >> --- a/tools/testing/selftests/mm/split_huge_page_test.c >> +++ b/tools/testing/selftests/mm/split_huge_page_test.c >> @@ -36,6 +36,7 @@ uint64_t pmd_pagesize; >> >> #define PFN_MASK ((1UL<<55)-1) >> #define KPF_THP (1UL<<22) >> +#define GET_ORDER(nr_pages) (31 - __builtin_clz(nr_pages)) >> >> int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file) >> { >> @@ -522,6 +523,9 @@ int main(int argc, char **argv) >> const char *fs_loc; >> bool created_tmp; >> int offset; >> + unsigned int max_order; >> + unsigned int nr_pages; >> + unsigned int tests; >> >> ksft_print_header(); >> >> @@ -533,35 +537,38 @@ int main(int argc, char **argv) >> if (argc > 1) >> optional_xfs_path = argv[1]; >> >> - ksft_set_plan(1+8+1+9+9+8*4+2); >> - >> pagesize = getpagesize(); >> pageshift = ffs(pagesize) - 1; >> pmd_pagesize = read_pmd_pagesize(); >> if (!pmd_pagesize) >> ksft_exit_fail_msg("Reading PMD pagesize failed\n"); >> >> + nr_pages = pmd_pagesize / pagesize; >> + max_order = GET_ORDER(nr_pages); > > There is a sz2ord() in cow.c and uffd-wp-mremap.c. > > Maybe we can factor it into vm_util.h and use it here. That sounds reasonable to me. -- Cheers, David / dhildenb