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 E4A5C3403E6 for ; Thu, 21 May 2026 21:55:19 +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=1779400521; cv=none; b=KhV1ku1b96yRTJfGLKNxuyQtA14NwwC1n0qi5K6mjcujLVdcJ6LkV2Sk4X+5ucz9Fnzj0woRPs2UGs2iokpBYBBpy2QeFHNq7mv4kGncksSqrYgH0SKfeLEDqkxqwVD6AkZDyN7EjARpx8gT5nd9oFsfVmn/bipDMEIxkIBf7to= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779400521; c=relaxed/simple; bh=UI4rYYYUAioU7uXshemogrZBMt1wgI3xMZO53bMyXm8=; h=Date:To:From:Subject:Message-Id; b=GEjBzK4Lv/TmLN5XECu0J8vO0Ay4VR40pTKxyYGmQeO1A7vAHhuex4QN07zZ/6Bq49CZg4MO+tVTsaajH/fgXyhrsN2RNuW92zKUMlu7hQqlnmoz+ME/chRv2VePS483ZK2OD3gnYFhOnnEe6msWenZfjj1qNCc0w7cUODVmk10= 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=YRwB6LkX; 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="YRwB6LkX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F5A21F000E9; Thu, 21 May 2026 21:55:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1779400519; bh=qXAoKBmuiPG9sbxKORsAuIJDriKj/+ukOt8mWs/WTq8=; h=Date:To:From:Subject; b=YRwB6LkXf3kH1aKyCzsT3Ep5DyFdUQqCnFINrAYzM7wgG9Rh1ofiqUIMqfZpiMF3L 5OoY7olrabRVPQkhtUrlUSOeGD1SzGNdCAaCL7INuDSqR5TSK5PJcrrS6j98HsRlq6 F+ZgaoP+tomOpput6cGQi54bQN1dOO6V7pRcz2Ik= Date: Thu, 21 May 2026 14:55:19 -0700 To: mm-commits@vger.kernel.org,sayalip@linux.ibm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test.patch added to mm-new branch Message-Id: <20260521215519.8F5A21F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: selftests/mm: size tmpfs according to PMD page size in split_huge_page_test has been added to the -mm mm-new branch. Its filename is selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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: Sayali Patil Subject: selftests/mm: size tmpfs according to PMD page size in split_huge_page_test Date: Thu, 21 May 2026 12:17:46 +0530 The split_file_backed_thp() test mounts a tmpfs with a fixed size of "4m". This works on systems with smaller PMD page sizes, but fails on configurations where the PMD huge page size is larger (e.g. 16MB). On such systems, the fixed 4MB tmpfs is insufficient to allocate even a single PMD-sized THP, causing the test to fail. Fix this by sizing the tmpfs dynamically based on the runtime pmd_pagesize, allocating space for two PMD-sized pages. Before patch: running ./split_huge_page_test /tmp/xfs_dir_YTrI5E -------------------------------------------------- TAP version 13 1..55 ok 1 Split zero filled huge pages successful ok 2 Split huge pages to order 0 successful ok 3 Split huge pages to order 2 successful ok 4 Split huge pages to order 3 successful ok 5 Split huge pages to order 4 successful ok 6 Split huge pages to order 5 successful ok 7 Split huge pages to order 6 successful ok 8 Split huge pages to order 7 successful ok 9 Split PTE-mapped huge pages successful Please enable pr_debug in split_huge_pages_in_file() for more info. Failed to write data to testing file: Success (0) Bail out! Error occurred Planned tests != run tests (55 != 9) Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0 [FAIL] After patch: running ./split_huge_page_test /tmp/xfs_dir_bMvj6o -------------------------------------------------- TAP version 13 1..55 ok 1 Split zero filled huge pages successful ok 2 Split huge pages to order 0 successful ok 3 Split huge pages to order 2 successful ok 4 Split huge pages to order 3 successful ok 5 Split huge pages to order 4 successful ok 6 Split huge pages to order 5 successful ok 7 Split huge pages to order 6 successful ok 8 Split huge pages to order 7 successful ok 9 Split PTE-mapped huge pages successful Please enable pr_debug in split_huge_pages_in_file() for more info. Please check dmesg for more information ok 10 File-backed THP split to order 0 test done Please enable pr_debug in split_huge_pages_in_file() for more info. Please check dmesg for more information ok 11 File-backed THP split to order 1 test done Please enable pr_debug in split_huge_pages_in_file() for more info. Please check dmesg for more information ok 12 File-backed THP split to order 2 test done ... ok 55 Split PMD-mapped pagecache folio to order 7 at in-folio offset 128 passed Totals: pass:55 fail:0 xfail:0 xpass:0 skip:0 error:0 [PASS] ok 1 split_huge_page_test /tmp/xfs_dir_bMvj6o Link: https://lore.kernel.org/33e1bc10753fe82d1217613d8cd496020778cf2b.1779296493.git.sayalip@linux.ibm.com Fixes: fbe37501b252 ("mm: huge_memory: debugfs for file-backed THP split") Signed-off-by: Sayali Patil Reviewed-by: Zi Yan Reviewed-by: David Hildenbrand (Arm) Tested-by: Venkat Rao Bagalkote Cc: Dev Jain Cc: Liam Howlett Cc: Miaohe Lin Cc: Michal Hocko Cc: Oscar Salvador Cc: "Ritesh Harjani (IBM)" Cc: Shuah Khan Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/split_huge_page_test.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/tools/testing/selftests/mm/split_huge_page_test.c~selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test +++ a/tools/testing/selftests/mm/split_huge_page_test.c @@ -472,6 +472,8 @@ static void split_file_backed_thp(int or char tmpfs_template[] = "/tmp/thp_split_XXXXXX"; const char *tmpfs_loc = mkdtemp(tmpfs_template); char testfile[INPUT_MAX]; + unsigned long size = 2 * pmd_pagesize; + char opts[64]; ssize_t num_written, num_read; char *file_buf1, *file_buf2; uint64_t pgoff_start = 0, pgoff_end = 1024; @@ -491,7 +493,8 @@ static void split_file_backed_thp(int or file_buf1[i] = (char)i; memset(file_buf2, 0, pmd_pagesize); - status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=always,size=4m"); + snprintf(opts, sizeof(opts), "huge=always,size=%lu", size); + status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, opts); if (status) ksft_exit_fail_msg("Unable to create a tmpfs for testing\n"); _ Patches currently in -mm which might be from sayalip@linux.ibm.com are selftests-mm-restore-default-nr_hugepages-value-via-exit-trap-in-charge_reserved_hugetlbsh.patch selftests-mm-fix-hugetlb-pathname-construction-in-charge_reserved_hugetlbsh.patch selftests-mm-restore-default-nr_hugepages-value-via-exit-trap-in-hugetlb_reparenting_testsh.patch selftests-mm-fix-hugetlb-pathname-construction-in-hugetlb_reparenting_testsh.patch selftests-mm-fix-cgroup-task-placement-and-drop-memorycurrent-checks-in-hugetlb_reparenting_testsh.patch selftests-mm-size-tmpfs-according-to-pmd-page-size-in-split_huge_page_test.patch selftests-mm-free-dynamically-allocated-pmd-sized-buffers-in-split_huge_page_test.patch selftest-mm-register-existing-mapping-with-userfaultfd-in-hugetlb-mremap.patch selftests-mm-ensure-destination-is-hugetlb-backed-in-hugetlb-mremap.patch selftests-mm-skip-uffd-wp-mremap-if-uffd-write-protect-is-unsupported.patch selftests-mm-skip-uffd-stress-test-when-nr_pages_per_cpu-is-zero.patch selftests-mm-skip-uffd-stress-test-when-nr_pages_per_cpu-is-zero-fix.patch selftests-mm-move-hwpoison-setup-into-run_test-and-silence-modprobe-output-for-memory-failure-category.patch selftests-mm-clarify-alternate-unmapping-in-compaction_test.patch