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Fri, 27 Mar 2026 17:28:59 -0700 (PDT) Received: from redhat.com ([209.132.188.88]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b242642956sm5490615ad.6.2026.03.27.17.28.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 17:28:57 -0700 (PDT) Date: Sat, 28 Mar 2026 08:28:55 +0800 From: Li Wang To: Andrew Morton Cc: rppt@kernel.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org, aubaker@redhat.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] selftests/mm: skip hugetlb_dio tests when DIO alignment is incompatible Message-ID: References: <20260327120305.58653-1-liwang@redhat.com> <20260327121350.858a127fa49ed6e1eb4a40a7@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260327121350.858a127fa49ed6e1eb4a40a7@linux-foundation.org> On Fri, Mar 27, 2026 at 12:13:50PM -0700, Andrew Morton wrote: > On Fri, 27 Mar 2026 20:03:05 +0800 Li Wang wrote: > > > hugetlb_dio test uses sub-page offsets (pagesize / 2) to verify that > > hugepages used as DIO user buffers are correctly unpinned at completion. > > > > However, on filesystems with a logical block size larger than half the > > page size (e.g., 4K-sector block devices), these unaligned DIO writes > > are rejected with -EINVAL, causing the test to fail unexpectedly. > > > > Add get_dio_alignment() to query the filesystem's required DIO alignment > > via statx(STATX_DIOALIGN) and pass it to run_dio_using_hugetlb(). Skip > > individual test cases whose write length is not a multiple of the > > alignment, so that aligned cases are still tested. > > > > === Reproduce Steps === > > > > # dd if=/dev/zero of=/tmp/test.img bs=1M count=512 > > # losetup --sector-size 4096 /dev/loop0 /tmp/test.img > > # mkfs.xfs /dev/loop0 > > # mkdir -p /mnt/dio_test > > # mount /dev/loop0 /mnt/dio_test > > > > // Modify test to open /mnt/dio_test and rebuild it: > > - fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT, 0664); > > + fd = open("/mnt/dio_test", O_TMPFILE | O_RDWR | O_DIRECT, 0664); > > > > # getconf PAGESIZE > > 4096 > > > > # echo 100 >/proc/sys/vm/nr_hugepages > > > > # ./hugetlb_dio > > TAP version 13 > > 1..4 > > # No. Free pages before allocation : 100 > > # No. Free pages after munmap : 100 > > ok 1 free huge pages from 0-12288 > > Bail out! Error writing to file > > : Invalid argument (22) > > # Planned tests != run tests (4 != 1) > > # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > > > > ... > > > > v2: > > - Pass dio_align as a parameter to run_dio_using_hugetlb() > > instead of generally page_size/2 alignment check. > > > > Whee, AI review has decided that pre glibc-2.36 is a problem (last time > it was pre-2.37). Ok, will handle this build issue with old glibc. > And it's forgotten the previous fs-doesnt-support-DIO issues. Did you > alter that? [Sorry, forgot to mention in change logs] Yes, I added O_DIRECT flag back to the first open(). Then it'd skip into a failure on filesystems that doesn't support O_DIRECT. Also, statx on FS doesn't support DIO will set stx_dio_offset_align to 0, which may led a division by zero issue, I added a zero check. } else if ((stx.stx_mask & STATX_DIOALIGN) && stx.stx_dio_offset_align) { > The get_dio_alignment-before-ksft_print_header thing seems legit. +1 And, before sending v3, I would leave this patch for more days to see if others comment. -- Regards, Li Wang