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Thu, 3 Jul 2025 14:52:31 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EC4BD5805D; Thu, 3 Jul 2025 14:52:30 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AB7CC5805E; Thu, 3 Jul 2025 14:52:25 +0000 (GMT) Received: from [9.109.245.113] (unknown [9.109.245.113]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 3 Jul 2025 14:52:25 +0000 (GMT) Message-ID: <5bc95d56-0b2e-404a-9740-cd68facf7f55@linux.ibm.com> Date: Thu, 3 Jul 2025 20:22:24 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/7] mm/selftests: Fix split_huge_page_test failure on systems with 64KB page size To: Zi Yan , Aboorva Devarajan Cc: akpm@linux-foundation.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, david@redhat.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, ritesh.list@gmail.com References: <20250703060656.54345-1-aboorvad@linux.ibm.com> <20250703060656.54345-5-aboorvad@linux.ibm.com> <9440CBF1-AE4E-4C9F-ABC6-EBCB74316CF8@nvidia.com> Content-Language: en-US From: Donet Tom In-Reply-To: <9440CBF1-AE4E-4C9F-ABC6-EBCB74316CF8@nvidia.com> Content-Type: text/plain; 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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") >> Signed-off-by: Donet Tom >> Signed-off-by: Aboorva Devarajan >> --- >> .../selftests/mm/split_huge_page_test.c | 23 ++++++++++++++----- >> 1 file changed, 17 insertions(+), 6 deletions(-) >> >> diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c >> index aa7400ed0e99..38296a758330 100644 >> --- a/tools/testing/selftests/mm/split_huge_page_test.c >> +++ b/tools/testing/selftests/mm/split_huge_page_test.c >> @@ -514,6 +514,15 @@ void split_thp_in_pagecache_to_order_at(size_t fd_size, const char *fs_loc, >> } >> } >> >> +static unsigned int get_order(unsigned int pages) >> +{ >> + unsigned int order = 0; >> + >> + while ((1U << order) < pages) >> + order++; >> + return order; >> +} >> + >> int main(int argc, char **argv) >> { >> int i; >> @@ -523,6 +532,7 @@ int main(int argc, char **argv) >> const char *fs_loc; >> bool created_tmp; >> int offset; >> + unsigned int max_order; >> >> ksft_print_header(); >> >> @@ -534,32 +544,33 @@ 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"); >> >> + max_order = get_order(pmd_pagesize/pagesize); > pmd_pagesize/pagesize is reused below, a tmp variable would be good. Thank you. I will add it in next version. > >> + ksft_set_plan(1+(max_order-1)+1+max_order+max_order+(max_order-1)*4+2); >> + >> fd_size = 2 * pmd_pagesize; >> >> split_pmd_zero_pages(); >> >> - for (i = 0; i < 9; i++) >> + for (i = 0; i < max_order; i++) >> if (i != 1) >> split_pmd_thp_to_order(i); >> >> split_pte_mapped_thp(); >> - for (i = 0; i < 9; i++) >> + for (i = 0; i < max_order; i++) >> split_file_backed_thp(i); >> >> created_tmp = prepare_thp_fs(optional_xfs_path, fs_loc_template, >> &fs_loc); >> - for (i = 8; i >= 0; i--) >> + for (i = (max_order-1); i >= 0; i--) >> split_thp_in_pagecache_to_order_at(fd_size, fs_loc, i, -1); >> >> - for (i = 0; i < 9; i++) >> + for (i = 0; i < max_order; i++) >> for (offset = 0; >> offset < pmd_pagesize / pagesize; >> offset += MAX(pmd_pagesize / pagesize / 4, 1 << i)) > With the change to get_order() proposed by David and ksft_set_plan() > simplification, Reviewed-by: Zi Yan > > Best Regards, > Yan, Zi