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 4wGnHckq 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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 3 Jul 2025, at 4:58, Donet Tom wrote: > On 7/3/25 1:52 PM, David Hildenbrand wrote: >> On 03.07.25 08:06, 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 onl= y >>> 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 fa= il. >>> >>> In this patch, we calculate the huge page order based on the system's b= ase >>> page size. With this change, the tests now run successfully on both 64K= B >>> and 4KB page size systems. >>> >>> Fixes: fa6c02315f745 ("mm: huge_memory: a new debugfs interface for spl= itting THP tests") >>> Signed-off-by: Donet Tom >>> Signed-off-by: Aboorva Devarajan >>> --- >>> =C2=A0 .../selftests/mm/split_huge_page_test.c=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 | 23 ++++++++++++++----- >>> =C2=A0 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, >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } >>> =C2=A0 } >>> =C2=A0 +static unsigned int get_order(unsigned int pages) >>> +{ >>> +=C2=A0=C2=A0=C2=A0 unsigned int order =3D 0; >>> + >>> +=C2=A0=C2=A0=C2=A0 while ((1U << order) < pages) >>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 order++; >>> +=C2=A0=C2=A0=C2=A0 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 =3D=3D= 32 >> >> or simpler >> >> return 31 - __builtin_clz(pages); >> >> E.g., if pages=3D512, you get 31-22=3D9 > > > Sure David, We will=C2=A0 change it. > > >> >>> + >>> =C2=A0 int main(int argc, char **argv) >>> =C2=A0 { >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int i; >>> @@ -523,6 +532,7 @@ int main(int argc, char **argv) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 const char *fs_loc; >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bool created_tmp; >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int offset; >>> +=C2=A0=C2=A0=C2=A0 unsigned int max_order; >>> =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ksft_print_header(); >>> =C2=A0 @@ -534,32 +544,33 @@ int main(int argc, char **argv) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (argc > 1) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 optional_xfs_pat= h =3D argv[1]; >>> =C2=A0 -=C2=A0=C2=A0=C2=A0 ksft_set_plan(1+8+1+9+9+8*4+2); >>> - >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pagesize =3D getpagesize(); >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pageshift =3D ffs(pagesize) - 1; >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pmd_pagesize =3D read_pmd_pagesize(); >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (!pmd_pagesize) >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ksft_exit_fail_m= sg("Reading PMD pagesize failed\n"); >>> =C2=A0 +=C2=A0=C2=A0=C2=A0 max_order =3D get_order(pmd_pagesize/pagesiz= e); >>> + 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. Best Regards, Yan, Zi