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Thu, 3 Jul 2025 14:30:54 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id ABE3E58059; Thu, 3 Jul 2025 14:30:53 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2A05358043; Thu, 3 Jul 2025 14:30:48 +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 14:30:47 +0000 (GMT) Message-ID: <3a99961c-6eda-434a-8721-58eaf8b989db@linux.ibm.com> Date: Thu, 3 Jul 2025 20:00:46 +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 Cc: David Hildenbrand , Aboorva Devarajan , akpm@linux-foundation.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, 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> <0e099baa-0a36-4ffd-821f-a7a4856fd52f@linux.ibm.com> <788EBC0F-67CB-4EE2-883F-A55CD394EE21@nvidia.com> Content-Language: en-US From: Donet Tom In-Reply-To: <788EBC0F-67CB-4EE2-883F-A55CD394EE21@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; >>>> +} >>> I think this can simply be >>> >>> return 32 - __builtin_clz(pages - 1); >>> >>> That mimics what get_order() in the kernel does for BITS_PER_LONG == 32 >>> >>> or simpler >>> >>> return 31 - __builtin_clz(pages); >>> >>> E.g., if pages=512, you get 31-22=9 >> >> Sure David, We will  change it. >> >> >>>> + >>>>   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); >>>> + ksft_set_plan(1+(max_order-1)+1+max_order+max_order+(max_order-1)*4+2); >>> Wow. Can we simplify that in any sane way? >> >> It is counting test by test. Let me try to simplify it and send the next version. > Yeah, I did that (ksft_set_plan(1+8+1+9+9+8*4+2);) to count different tests > separately and in the same order as the following tests, so that I could > get ksft_set_plan number right when adding or removing tests. Maybe it is > fine to just sum them up now. Sure. Thank you > > Best Regards, > Yan, Zi >