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[2003:cb:c708:e100:4f41:ff29:a59f:8c7a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e9dd1957sm55356285e9.16.2025.01.10.07.37.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 07:37:10 -0800 (PST) Message-ID: <1a5c39e5-a138-4713-bfbb-54f62896a702@redhat.com> Date: Fri, 10 Jan 2025 16:37:09 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] selftests/mm: virtual_address_range: Unmap chunks after validation To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , Andrew Morton , Shuah Khan , Dev Jain , Thomas Gleixner Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250110-virtual_address_range-tests-v2-0-262a2bf3c3d0@linutronix.de> <20250110-virtual_address_range-tests-v2-2-262a2bf3c3d0@linutronix.de> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20250110-virtual_address_range-tests-v2-2-262a2bf3c3d0@linutronix.de> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: v7CidDFhIO7CfKaGC4KqiWLwJa9fRlWeYND_Trkq7Jc_1736523433 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: CB1191C000D X-Rspamd-Server: rspam12 X-Stat-Signature: s47wi775617a8afa17di48t9i1qby889 X-Rspam-User: X-HE-Tag: 1736523436-600902 X-HE-Meta: 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 ntUaPiBa LZknEp+c91opA6FH6y6ftj+Ua0KYZCZ3pWDin53TdZhk5GYY57EqV+ERlu3oEfLQLr5t7KoJseW70uT98pJrGF8txr8+rXAQx3fJhmCN7WgLMwjowlQJsE1CTuZ2InFGzNhIAlNFiAqEMLjMoWWFUgGQc/dZySb38G9XQY9dETM/4tPiYDK2Sat3GC6X/vzoxqc7eMCFCQjBBFEzUnb76NB2dKppDvXMAWBZvF88k9vJU19AGAGLVVTMC73RBtyRjBweCQ6zovlTjfFvjPW9kxmzM77tApUXDMVVegDEuBZ88IqhKYqcs1dtZH8jGQ9s1neTKP/7+n4OyvGaysggfoq9k1188bJyrNFuo+kKqMLzxNd2YgbiUoNIMqnDy3JLORa0hX2sUMaO5PrOHVnfStAzZ1Za98mKY7tdYAn4BVP48Fq1DnKWwwpGLjnmTQAtQY8QDmK7s3KGK2s/t6bIGTTIXuQ== 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 10.01.25 14:05, Thomas Weißschuh wrote: > For each accessed chunk a PTE is created. > More than 1GiB of PTEs is used in this way. > Remove each PTE after validating a chunk to reduce peak memory usage. > > It is important to only unmap memory that previously mmap()ed, > as unmapping other mappings like the stack, heap or executable mappings > will crash the process. > The mappings read from /proc/self/maps and the return values from mmap() > don't allow a simple correlation due to merging and no guaranteed order. > To correlate the pointers and mappings use prctl(PR_SET_VMA_ANON_NAME). > While it introduces a test dependency, other alternatives would > introduce runtime or development overhead. > > Fixes: 010409649885 ("selftests/mm: confirm VA exhaustion without reliance on correctness of mmap()") > Signed-off-by: Thomas Weißschuh > --- > tools/testing/selftests/mm/config | 1 + > tools/testing/selftests/mm/virtual_address_range.c | 26 ++++++++++++++++++++-- > 2 files changed, 25 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config > index 4309916f629e36498efb07eb606b2f0c49ee6211..a28baa536332f3fcfb1b83759b5fbb432ae80178 100644 > --- a/tools/testing/selftests/mm/config > +++ b/tools/testing/selftests/mm/config > @@ -7,3 +7,4 @@ CONFIG_TEST_HMM=m > CONFIG_GUP_TEST=y > CONFIG_TRANSPARENT_HUGEPAGE=y > CONFIG_MEM_SOFT_DIRTY=y > +CONFIG_ANON_VMA_NAME=y I'm afraid, nobody uses these :) People run these tests against arbitrary kernels (i.e., distro kernels). In addition to that, we should handle it like uffd-unit-tests.c and sense support for CONFIG_ANON_VMA_NAME in the current kernel. If not around skip the test, like uffd-unit-tests.c does. > diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c > index ea6ccf49ef4c552f26317c2a40b09bca1a677f8f..4fc1c21a5e218eaec4d059b75c31a21dd4e8a215 100644 > --- a/tools/testing/selftests/mm/virtual_address_range.c > +++ b/tools/testing/selftests/mm/virtual_address_range.c > @@ -10,6 +10,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -82,6 +83,17 @@ static void validate_addr(char *ptr, int high_addr) > ksft_exit_fail_msg("Bad address %lx\n", addr); > } > > +static void mark_addr(char *ptr) I would call this "mark_range" and pass the size (MAP_CHUNK_SIZE) as well. > +{ > + if (prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, ptr, MAP_CHUNK_SIZE, "virtual_address_range")) > + ksft_exit_fail_msg("prctl(PR_SET_VMA_ANON_NAME) failed: %s\n", strerror(errno)); > +} > + > +static int is_marked_addr(const char *vma_name) "is_marked_vma" / "is_marked_mapping" ? Because you are not passing an address ... Apart from that LGTM. -- Cheers, David / dhildenb