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[2003:d8:2f28:7800:30d7:645a:7306:e437]) by smtp.gmail.com with ESMTPSA id c12-20020a056000104c00b00333339e5f42sm1767916wrx.32.2023.12.01.12.47.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Dec 2023 12:47:09 -0800 (PST) Message-ID: Date: Fri, 1 Dec 2023 21:47:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 5/5] selftests/mm: add UFFDIO_MOVE ioctl test To: Ryan Roberts , Suren Baghdasaryan , akpm@linux-foundation.org Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, shuah@kernel.org, aarcange@redhat.com, lokeshgidra@google.com, peterx@redhat.com, hughd@google.com, mhocko@suse.com, axelrasmussen@google.com, rppt@kernel.org, willy@infradead.org, Liam.Howlett@oracle.com, jannh@google.com, zhangpeng362@huawei.com, bgeffon@google.com, kaleshsingh@google.com, ngeoffray@google.com, jdduke@google.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@android.com References: <20231121171643.3719880-1-surenb@google.com> <20231121171643.3719880-6-surenb@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 614rbphk8r7uxex5cx9sdq9y58jumn3b X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: A147DA0028 X-Rspam-User: X-HE-Tag: 1701463635-886992 X-HE-Meta: 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 kVgbx4Gb 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 01.12.23 10:29, Ryan Roberts wrote: > On 21/11/2023 17:16, Suren Baghdasaryan wrote: >> Add tests for new UFFDIO_MOVE ioctl which uses uffd to move source >> into destination buffer while checking the contents of both after >> the move. After the operation the content of the destination buffer >> should match the original source buffer's content while the source >> buffer should be zeroed. Separate tests are designed for PMD aligned and >> unaligned cases because they utilize different code paths in the kernel. >> >> Signed-off-by: Suren Baghdasaryan >> --- >> tools/testing/selftests/mm/uffd-common.c | 24 +++ >> tools/testing/selftests/mm/uffd-common.h | 1 + >> tools/testing/selftests/mm/uffd-unit-tests.c | 189 +++++++++++++++++++ >> 3 files changed, 214 insertions(+) >> >> diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c >> index fb3bbc77fd00..b0ac0ec2356d 100644 >> --- a/tools/testing/selftests/mm/uffd-common.c >> +++ b/tools/testing/selftests/mm/uffd-common.c >> @@ -631,6 +631,30 @@ int copy_page(int ufd, unsigned long offset, bool wp) >> return __copy_page(ufd, offset, false, wp); >> } >> >> +int move_page(int ufd, unsigned long offset, unsigned long len) >> +{ >> + struct uffdio_move uffdio_move; >> + >> + if (offset + len > nr_pages * page_size) >> + err("unexpected offset %lu and length %lu\n", offset, len); >> + uffdio_move.dst = (unsigned long) area_dst + offset; >> + uffdio_move.src = (unsigned long) area_src + offset; >> + uffdio_move.len = len; >> + uffdio_move.mode = UFFDIO_MOVE_MODE_ALLOW_SRC_HOLES; >> + uffdio_move.move = 0; >> + if (ioctl(ufd, UFFDIO_MOVE, &uffdio_move)) { >> + /* real retval in uffdio_move.move */ >> + if (uffdio_move.move != -EEXIST) >> + err("UFFDIO_MOVE error: %"PRId64, >> + (int64_t)uffdio_move.move); > > Hi Suren, > > FYI this error is triggering in mm-unstable (715b67adf4c8): > > Testing move-pmd on anon... ERROR: UFFDIO_MOVE error: -16 (errno=16, > @uffd-common.c:648) > > I'm running in a VM on Apple M2 (arm64). I haven't debugged any further, but > happy to go deeper if you can direct. Does it trigger reliably? Which pagesize is that kernel using? I can spot that uffd_move_pmd_test()/uffd_move_pmd_handle_fault() uses default_huge_page_size(), which reads the default hugetlb size. That, however, does not necessarily correspond to the THP size. That one can be obtained using read_pmd_pagesize() in vm_util.c I quickly scanned the code (still want to take a deeper look), but all PAE checks looked sane to me. I think the issue is folio split handling. I replied to the patch. -- Cheers, David / dhildenb