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Tue, 19 Aug 2025 07:57:32 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CA9AB20043; Tue, 19 Aug 2025 07:57:31 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E141420040; Tue, 19 Aug 2025 07:57:21 +0000 (GMT) Received: from aboo.ibm.com (unknown [9.150.8.232]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 19 Aug 2025 07:57:21 +0000 (GMT) Message-ID: <588d7bc1af412052da01ada1e316dc3452e35435.camel@linux.ibm.com> Subject: Re: [PATCH v4 4/7] mm/selftests: Fix split_huge_page_test failure on systems with 64KB page size From: Aboorva Devarajan To: Wei Yang , akpm@linux-foundation.org Cc: Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, david@redhat.com, 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 Date: Tue, 19 Aug 2025 13:27:19 +0530 In-Reply-To: <20250816143129.u2rdwpwvfhsdptvx@master> References: <20250816040113.760010-1-aboorvad@linux.ibm.com> <20250816040113.760010-5-aboorvad@linux.ibm.com> <20250816143129.u2rdwpwvfhsdptvx@master> 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. > >=20 > > 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. > >=20 > > Fixes: fa6c02315f745 ("mm: huge_memory: a new debugfs interface for > > splitting THP tests") > > Co-developed-by: Aboorva Devarajan > > Signed-off-by: Aboorva Devarajan > > Reviewed-by: Dev Jain > > Reviewed-by: Zi Yan > > Signed-off-by: Donet Tom >=20 > Reviewed-by: Wei Yang >=20 > Nit below: >=20 > > --- > > tools/testing/selftests/mm/cow.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 5 ----- > > .../selftests/mm/split_huge_page_test.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 | 22 ++++++++++++---- > > --- > > tools/testing/selftests/mm/uffd-wp-mremap.c=C2=A0=C2=A0 |=C2=A0 5 ----- > > tools/testing/selftests/mm/vm_util.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 |=C2=A0 5 +++++ > > 4 files changed, 19 insertions(+), 18 deletions(-) > >=20 > > diff --git a/tools/testing/selftests/mm/cow.c > > b/tools/testing/selftests/mm/cow.c > > index 90ee5779662f..e742d9313798 100644 > > --- a/tools/testing/selftests/mm/cow.c > > +++ b/tools/testing/selftests/mm/cow.c > > @@ -41,11 +41,6 @@ static size_t hugetlbsizes[10]; > > static int gup_fd; > > static bool has_huge_zeropage; > >=20 > > -static int sz2ord(size_t size) > > -{ > > - return __builtin_ctzll(size / pagesize); > > -} > > - > > static int detect_thp_sizes(size_t sizes[], int max) > > { > > int count =3D 0; > > diff --git a/tools/testing/selftests/mm/split_huge_page_test.c > > b/tools/testing/selftests/mm/split_huge_page_test.c > > index eadbeb820d71..7cbeaebc9d71 100644 > > --- a/tools/testing/selftests/mm/split_huge_page_test.c > > +++ b/tools/testing/selftests/mm/split_huge_page_test.c > > @@ -523,6 +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; > >=20 > > ksft_print_header(); > >=20 > > @@ -534,35 +537,38 @@ int main(int argc, char **argv) > > if (argc > 1) > > optional_xfs_path =3D argv[1]; > >=20 > > - ksft_set_plan(1+8+1+9+9+8*4+2); > > - > > pagesize =3D getpagesize(); > > pageshift =3D ffs(pagesize) - 1; > > pmd_pagesize =3D read_pmd_pagesize(); > > if (!pmd_pagesize) > > ksft_exit_fail_msg("Reading PMD pagesize > > failed\n"); > >=20 > > + nr_pages =3D pmd_pagesize / pagesize; > > + max_order =3D=C2=A0 sz2ord(pmd_pagesize); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^ > =C2=A0=C2=A0=C2=A0 extra space here Hi Wei, Thanks for the review. I=E2=80=99ve sent a fixup patch for this: https://lore.kernel.org/all/20250819041239.167537-1-aboorvad@linux.ibm.com/ Andrew,=C2=A0 Could you please apply the above fixup patch? Regards, Aboorva >=20 > > + tests =3D 2 + (max_order - 1) + (2 * max_order) + (max_order > > - 1) * 4 + 2; > > + ksft_set_plan(tests); > > + > > fd_size =3D 2 * pmd_pagesize; > >=20 > > split_pmd_zero_pages(); > >=20