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Sun, 10 Nov 2024 06:49:08 +0000 (GMT) From: Donet Tom To: akpm@linux-foundation.org Cc: Usama.Anjum@collabora.com, donettom@linux.ibm.com, kernel@collabora.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, shuah@kernel.org Subject: [PATCH] selftests: hugetlb_dio: Fixup Check for initial conditions to skip in the start Date: Sun, 10 Nov 2024 00:49:03 -0600 Message-ID: <20241110064903.23626-1-donettom@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241109223436.3ddeaf1d60e1ade8f562d757@linux-foundation.org> References: <20241109223436.3ddeaf1d60e1ade8f562d757@linux-foundation.org> 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-ORIG-GUID: tCo3NsxOEUKn0qsJpazH5rZ1MBq6zfoW X-Proofpoint-GUID: tCo3NsxOEUKn0qsJpazH5rZ1MBq6zfoW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 mlxlogscore=689 lowpriorityscore=0 adultscore=0 mlxscore=0 impostorscore=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411100058 Content-Type: text/plain; charset="utf-8" This test verifies that a hugepage, used as a user buffer for DIO operations, is correctly freed upon unmapping. To test this, we read the count of free hugepages before and after the mmap, DIO, and munmap operations, then check if the free hugepage count is the same. Reading free hugepages before the test was removed by commit 0268d4579901 ('selftests: hugetlb_dio: check for initial conditions to skip at the start'), causing the test to always fail. This patch adds back reading the free hugepages before starting the test. With this patch, the tests are now passing. Test Results without this patch ./tools/testing/selftests/mm/hugetlb_dio TAP version 13 1..4 # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 1 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 2 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 3 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 4 : Huge pages not freed! # Totals: pass:0 fail:4 xfail:0 xpass:0 skip:0 error:0 Test results with this patch. ./tools/testing/selftests/mm/hugetlb_dio TAP version 13 1..4 # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 1 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 2 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 3 : Huge pages not freed! # No. Free pages before allocation : 0 # No. Free pages after munmap : 100 not ok 4 : Huge pages not freed! # Totals: pass:0 fail:4 xfail:0 xpass:0 skip:0 error:0 Fixes: 0268d4579901 ("selftests: hugetlb_dio: check for initial conditions = to skip in the start") Signed-off-by: Donet Tom --- tools/testing/selftests/mm/hugetlb_dio.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/mm/hugetlb_dio.c b/tools/testing/selft= ests/mm/hugetlb_dio.c index 60001c142ce9..432d5af15e66 100644 --- a/tools/testing/selftests/mm/hugetlb_dio.c +++ b/tools/testing/selftests/mm/hugetlb_dio.c @@ -44,6 +44,13 @@ void run_dio_using_hugetlb(unsigned int start_off, unsig= ned int end_off) if (fd < 0) ksft_exit_fail_perror("Error opening file\n"); =20 + /* Get the free huge pages before allocation */ + free_hpage_b =3D get_free_hugepages(); + if (free_hpage_b =3D=3D 0) { + close(fd); + ksft_exit_skip("No free hugepage, exiting!\n"); + } + /* Allocate a hugetlb page */ orig_buffer =3D mmap(NULL, h_pagesize, mmap_prot, mmap_flags, -1, 0); if (orig_buffer =3D=3D MAP_FAILED) { --=20 2.43.5