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It does so by: >> 1. getting the pfn of the vaddr; >> 2. checking kpageflags of the pfn; >> >> if order is greater than 0: >> 3. checking kpageflags of the head pfn; >> 4. checking kpageflags of all tail pfns. >> >> pmd_order is added to split_huge_page_test.c and replaces max_order. >> >> Signed-off-by: Zi Yan >> --- >> .../selftests/mm/split_huge_page_test.c | 67 +++++++++++++------= >> tools/testing/selftests/mm/vm_util.c | 2 +- >> tools/testing/selftests/mm/vm_util.h | 1 + >> 3 files changed, 48 insertions(+), 22 deletions(-) >> >> diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools= /testing/selftests/mm/split_huge_page_test.c >> index 63ac82f0b9e0..3aaf783f339f 100644 >> --- a/tools/testing/selftests/mm/split_huge_page_test.c >> +++ b/tools/testing/selftests/mm/split_huge_page_test.c >> @@ -25,6 +25,7 @@ >> uint64_t pagesize; >> unsigned int pageshift; >> uint64_t pmd_pagesize; >> +unsigned int pmd_order; >> >> #define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages" >> #define SMAP_PATH "/proc/self/smaps" >> @@ -36,23 +37,48 @@ uint64_t pmd_pagesize; >> >> #define GET_ORDER(nr_pages) (31 - __builtin_clz(nr_pages)) >> >> -int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_fi= le) >> +int is_backed_by_folio(char *vaddr, int order, int pagemap_fd, int kp= ageflags_fd) >> { >> - uint64_t paddr; >> - uint64_t page_flags; >> + unsigned long pfn_head; >> + uint64_t pfn_flags; >> + unsigned long pfn; >> + unsigned long i; >> >> - if (pagemap_file) { >> - pread(pagemap_file, &paddr, sizeof(paddr), >> - ((long)vaddr >> pageshift) * sizeof(paddr)); >> + if (!pagemap_fd || !kpageflags_fd) >> + return 0; > > The same in patch 2. Will fix it. > >> >> - if (kpageflags_file) { >> - pread(kpageflags_file, &page_flags, sizeof(page_flags), >> - PAGEMAP_PFN(paddr) * sizeof(page_flags)); >> + pfn =3D pagemap_get_pfn(pagemap_fd, vaddr); >> >> - return !!(page_flags & KPF_THP); >> - } >> + if (pfn =3D=3D -1UL) >> + return 0; >> + >> + if (get_pfn_flags(pfn, kpageflags_fd, &pfn_flags)) >> + return 0; >> + >> + if (!order) { >> + if (pfn_flags & (KPF_THP | KPF_COMPOUND_HEAD | KPF_COMPOUND_TAIL)) >> + return 0; >> + return 1; >> } >> - return 0; >> + >> + if (!(pfn_flags & KPF_THP)) >> + return 0; >> + >> + pfn_head =3D pfn & ~((1 << order) - 1); >> + >> + if (get_pfn_flags(pfn_head, kpageflags_fd, &pfn_flags)) >> + return 0; >> + >> + if (!(pfn_flags & (KPF_THP | KPF_COMPOUND_HEAD))) >> + return 0; >> + >> + for (i =3D 1; i < (1UL << order) - 1; i++) { > > Do we miss the last tail? Yes, will fix it. > >> + if (get_pfn_flags(pfn_head + i, kpageflags_fd, &pfn_flags)) >> + return 0; >> + if (!(pfn_flags & (KPF_THP | KPF_COMPOUND_TAIL))) >> + return 0; >> + } > > If this folio is larger than order, would it still return 1? Yes, but it should be good enough for current use. Will add a comment abo= ut it. Thanks for the review. Best Regards, Yan, Zi