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Mon, 6 Apr 2026 09:20:01 +0000 (GMT) From: Sayali Patil To: Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Miaohe Lin , Venkat Rao Bagalkote , Sayali Patil Subject: [PATCH v4 06/15] selftests/mm: size tmpfs according to PMD page size in split_huge_page_test Date: Mon, 6 Apr 2026 14:49:25 +0530 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=Bp+QAIX5 c=1 sm=1 tr=0 ts=69d37acb cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=Ikd4Dj_1AAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=2DqBuDyFdJ_AORcY0zkA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA2MDA5MCBTYWx0ZWRfX2nir+uOPUP7V eZy2CrCAuQTPd0ZX4DHbX9TeMZGTzN19LAkyMfPR65NLBAUX3M4lZxj8QnNFSQnBavANHHy0sR6 rA2GOJj0UwXfz8KTYpcCAap76u19I6lfy9D0I/p18ffEB1VD6ZRJVoB0jo6EyGB80Gz/4QcwzW+ hZO+VcU0itWGVa+KCdx/sTjdnPkFHtjeg5/VNhIbVqNHe+SGNno8L+m8Ikr1PmLjkoZuagqR/sO whfNL4oSEZV1DmH6pjn9DIhIhqUc+RALTDoAff1kQwx3WfD2jOyJkMR3kvOPPC3HF5SYk+aYTM0 F2VoA3YJISHLdoaEY06QPw08Enu1t5cTAT7kZBH0jzvKe4+V8dMySsk000zOS9V10BadD4dJOPS GiKxdOniY1hnrayo/gQ8lp2dJPVyGw9S4K+QN5qJgsXKhSca9kj4KaXUWqqryhrH7ZNz+Sf+913 RTEn368WkY5OgjBNHsw== X-Proofpoint-GUID: CX7u1yjqQVtEQ4iW6KqbqUiUpJyD0NDv X-Proofpoint-ORIG-GUID: 7FUqPZYTnCHDzchU8xb7T7f_019zCoNA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-06_02,2026-04-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 suspectscore=0 adultscore=0 impostorscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604060090 Content-Type: text/plain; charset="utf-8" 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 !=3D run tests (55 !=3D 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 Fixes: fbe37501b252 ("mm: huge_memory: debugfs for file-backed THP split") Reviewed-by: Zi Yan Reviewed-by: David Hildenbrand (Arm) Tested-by: Venkat Rao Bagalkote Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/split_huge_page_test.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/test= ing/selftests/mm/split_huge_page_test.c index e0167111bdd1..57e8a1c9647a 100644 --- a/tools/testing/selftests/mm/split_huge_page_test.c +++ b/tools/testing/selftests/mm/split_huge_page_test.c @@ -484,6 +484,8 @@ static void split_file_backed_thp(int order) char tmpfs_template[] =3D "/tmp/thp_split_XXXXXX"; const char *tmpfs_loc =3D mkdtemp(tmpfs_template); char testfile[INPUT_MAX]; + unsigned long size =3D 2 * pmd_pagesize; + char opts[64]; ssize_t num_written, num_read; char *file_buf1, *file_buf2; uint64_t pgoff_start =3D 0, pgoff_end =3D 1024; @@ -503,7 +505,8 @@ static void split_file_backed_thp(int order) file_buf1[i] =3D (char)i; memset(file_buf2, 0, pmd_pagesize); =20 - status =3D mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=3Dalways,size=3D4m= "); + snprintf(opts, sizeof(opts), "huge=3Dalways,size=3D%lu", size); + status =3D mount("tmpfs", tmpfs_loc, "tmpfs", 0, opts); =20 if (status) ksft_exit_fail_msg("Unable to create a tmpfs for testing\n"); --=20 2.52.0