From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C2B741C75F9 for ; Fri, 2 Oct 2026 00:37:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790901465; cv=none; b=Sdj2z/0/e32JlKI6LlchQ2Y3yc2rCSHbGBPPXTAJfh5mUuHK1S+QtWh9Tb/ksXpiqHthKTEZJqz1s7V0X/W7xFWHjw16gaYn+NBGH011MTWr1tBLI9/olV52eNSaHCPyiDtAeGzRayJHXgXTA0aoL+k+9mgEOYGcOGwQyTUICak= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790901465; c=relaxed/simple; bh=gRSSn58Jq4b78HUnyEreTifuZnoezaNbn/YHrScvP3g=; h=Date:To:From:Subject:Message-Id; b=mPGDRcHMWSRisXNeRTRZ/lgL2wqa/b4R45awV0NlO0gItsCCGxEOpqBkoEpALJrx69k+clHQTHiDsO0up9gaRyzkUx5knXoiVI79A2p4BwrcQU0COIbTZ1iLHIGqaU+WXOeYb9eNVbYMPPj1iKfftRDZc/5J0SPH6iHuXpq7fh0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=lJuPNnHz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="lJuPNnHz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47E951F000FF; Fri, 2 Oct 2026 00:37:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790901463; bh=GIq2e7u+LNdXI2HkkTbRgNfk3Q6Xf0cIAo0mYWmTt6w=; h=Date:To:From:Subject; b=lJuPNnHzj7OfesJss0y/xsZKcvombkacJhzo2pcqvempGJsBSdIkX+N4EtHw3yZ9B zWAQCCBEr9bv55TtQBxUiD4g8v9SSQybYNhe1g8BRL5gcN6O8MiiTBJ5kpeFJFJc4I h7JWN7Wjn01Qrr68rViO2WMucrgxcRgH4cn5qnhk= Date: Thu, 01 Oct 2026 17:37:42 -0700 To: mm-commits@vger.kernel.org,yeoreum.yun@arm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + kselftest-mm-integrate-huge-page-checks.patch added to mm-unstable branch Message-Id: <20261002003743.47E951F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: kselftest: mm: integrate huge page checks has been added to the -mm mm-unstable branch. Its filename is kselftest-mm-integrate-huge-page-checks.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kselftest-mm-integrate-huge-page-checks.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Yeoreum Yun Subject: kselftest: mm: integrate huge page checks Date: Thu, 01 Oct 2026 22:17:53 +0100 check_large_folios() only checks for large folios without distinguishing between anonymous and file-backed huge pages. To add huge page type checking, integrate the huge page checks into __check_huge() and __check_type(): 1. If hpage_size == pmd_pagesize, check PAGE_IS_HUGE instead of using check_large_folios(), since only the mapping type matters. This identifies PMD-mapped huge pages. 2. Otherwise, use check_large_folios() to detect large folios. This covers mTHP cases. 3. Check the folio flags according to the huge page type via __check_type() Link: https://lore.kernel.org/20261001-fix_split-v9-3-0f4ba8bbdbdf@arm.com Signed-off-by: Yeoreum Yun Signed-off-by: Andrew Morton Suggested-by: David Hildenbrand (Arm) Suggested-by: Zi Yan Cc: Lorenzo Stoakes Cc: Baolin Wang Cc: Liam R. Howlett Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lance Yang Cc: Usama Arif Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Shuah Khan Cc: Kevin Brodsky --- tools/testing/selftests/mm/vm_util.c | 90 +++++++++++++++---------- 1 file changed, 56 insertions(+), 34 deletions(-) --- a/tools/testing/selftests/mm/vm_util.c~kselftest-mm-integrate-huge-page-checks +++ a/tools/testing/selftests/mm/vm_util.c @@ -392,76 +392,98 @@ out: return ret; } -enum check_huge_type { - CHECK_HUGE_ANON, - CHECK_HUGE_FILE, +enum check_type { + CHECK_TYPE_ANON, + CHECK_TYPE_FILE, }; -static bool check_huge_type(uint64_t categories, enum check_huge_type type) +static bool __check_type(void *addr, size_t len, uint64_t page_size, + enum check_type type) { - const bool file = categories & PAGE_IS_FILE; + bool ret = false; + int pagemap_fd; + char *start = addr; + char *end = start + len; + uint64_t categories; + + pagemap_fd = open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd < 0) + ksft_exit_fail_perror("open pagemap"); - switch (type) { - case CHECK_HUGE_ANON: - return !file; - case CHECK_HUGE_FILE: - return file; + for (; start < end; start += page_size) { + categories = pagemap_scan_get_categories(pagemap_fd, start); + if ((categories & PAGE_IS_PRESENT) != PAGE_IS_PRESENT) + continue; + + if ((type == CHECK_TYPE_FILE) != !!(categories & PAGE_IS_FILE)) + goto out; } - return false; + ret = true; + +out: + close(pagemap_fd); + return ret; } -static bool __check_pmd_huge(void *addr, size_t len, int nr_hpages, - uint64_t hpage_size, enum check_huge_type type) +static bool __check_huge(void *addr, size_t len, int nr_hpages, + uint64_t hpage_size) { + bool ret = false; int pagemap_fd; int nr_pmd_mappings = 0; + uint64_t pmd_pagesize; uint64_t categories; char *start = addr; char *end = start + len; + pmd_pagesize = read_pmd_pagesize(); + if (!pmd_pagesize) + ksft_exit_fail_msg("reading PMD pagesize failed\n"); + pagemap_fd = open(PAGEMAP_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_perror("open pagemap"); + if (hpage_size != pmd_pagesize) { + ret = check_large_folios(addr, len, nr_hpages, hpage_size); + goto out; + } + for (; start < end; start += hpage_size) { categories = pagemap_scan_get_categories(pagemap_fd, start); - if (!(categories & PAGE_IS_HUGE)) - continue; - if (check_huge_type(categories, type)) + if (categories & PAGE_IS_HUGE) nr_pmd_mappings++; } - close(pagemap_fd); - return nr_hpages == nr_pmd_mappings; + if (nr_pmd_mappings != nr_hpages) + goto out; + + ret = true; + +out: + close(pagemap_fd); + return ret; } bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - uint64_t pmd_pagesize = read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + const uint64_t scan_mapping_size = (nr_hpages > 0) ? hpage_size : psize(); - if (hpage_size == pmd_pagesize) - return __check_pmd_huge(addr, len, nr_hpages, hpage_size, - CHECK_HUGE_ANON); + if (!__check_huge(addr, len, nr_hpages, hpage_size)) + return false; - return check_large_folios(addr, len, nr_hpages, hpage_size); + return __check_type(addr, len, scan_mapping_size, CHECK_TYPE_ANON); } bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - uint64_t pmd_pagesize = read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + const uint64_t scan_mapping_size = (nr_hpages > 0) ? hpage_size : psize(); - if (hpage_size == pmd_pagesize) - return __check_pmd_huge(addr, len, nr_hpages, hpage_size, - CHECK_HUGE_FILE); + if (!__check_huge(addr, len, nr_hpages, hpage_size)) + return false; - return check_large_folios(addr, len, nr_hpages, hpage_size); + return __check_type(addr, len, scan_mapping_size, CHECK_TYPE_FILE); } bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) _ Patches currently in -mm which might be from yeoreum.yun@arm.com are kselftest-mm-fix-potential-failure-for-merged-vma-in-guard-regions.patch kselftest-mm-remove-exclusion-of-building-soft-dirty-test-in-arm64.patch kselftest-mm-return-fail-when-child-test-result-is-fail-in-khugepaged.patch kselftest-mm-fix-intermittent-failure-khugepaged-test.patch kselftest-mm-prevent-random-failure-of-huge-page-split-for-khugepaged.patch kselftest-mm-replace-usage-of-proc-self-smaps-for-__check_pmd_huge.patch kselftest-mm-integrate-huge-page-checks.patch kselftest-mm-remove-check_huge_shmem.patch