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b=o1GqSZMPrLBpAUuJqza5bmDUQOVrBe3F6G2X89Q+yFPp6HbKLgeegbzCQMYLF8520 HTrLyJ1UYcreRqV8EClqLPD+9cfzx/nWsT0/8i324e0c267AXaxKAmdh3uFk+70knL 4cb/AkERs8BbCeRxozLoV84DS6jgXQ/32HbrNGyG8eoDAx3g/QlCzxLrxY22CbVE3l dnYW8BDqZ61K2ort8T2c1Z/luTvGXoItq8BHs+vJdnQBN4xZVSTPuZj4qFV6pCNpAr BhgwMwQlSP3jDokl3tJEdZZ3oYxd5Aru3ZaR7VIQHBY6/4Afi+kbIOOCNzQjzDvAlD Hv+PPrP+ihZGA== Message-ID: <8a06e724-7def-4c61-b340-ef1b3cd8100b@kernel.org> Date: Thu, 19 Feb 2026 10:07:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm: skip migration tests if NUMA is unavailable To: AnishMulay , akpm@linux-foundation.org, shuah@kernel.org Cc: lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260218163941.13499-1-anishm7030@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260218163941.13499-1-anishm7030@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspam-User: X-Rspamd-Queue-Id: 3224710000E X-Stat-Signature: sm5ipt8gxsffpbt9kebce97ihg7o91xs X-HE-Tag: 1771492050-995278 X-HE-Meta: U2FsdGVkX1+tFTLjTlRgWlGks36H3bKs9T8eKi2Br9Swt6cjJGGgaOkyuXKZ2zfjmI3fGiH5gRZKbQKyCyHiNnPBqW/EgzKeHkYo5BlAUBh0pwA4gHXMUMbDqhv6+VDok/53Bfbu/cD7tmKWCvASE0h2sYOmzmGyXqYHxPFYgL0z/+iTuzQYc2bvwm/LhxYm5pl0UVrgEf5ZYng+vbF39p3lgPhY/93nbIhJ4+hdMrsPpSSzxKIb5wFuE9Zl86mkIxGvpcoHAiU0tJt57F/aJlQc1Xis1afsSWtOUBZ2rF+UwAYbWNEUC05Cxi0HrL/xY525lzp61vfHvQljsKDBUM5qpvlRtuNQ6wkCxKeWy+HjagI6Bpgdl06mEdk+mEY4V2bvZW55QyesJVhdJia2WtjYYhZsFiIXyTV8rNw/L8/eKjN2oJ40va/YVNiDx2KG9Wxa0IGrFmQY6hWVhmF5kOCF8Hxtmq8KW+eKSccKgYtXqPOysKBlEiM3IQjeyNB2FCxDa4uUNPQEmwi1T786GHfQemZZyHqfofZaWsbLYwzEEPsL1z/Z7mXUJtLgAWTDpCN/W4nrKNnFn75FBok2dyp+ygq1Sz9o47yuyJROM17RA/9MegPX6Cc7SgtmAFz4XTYey9ZwGVXU0xBCqdPMFhOwh3esCrdjkTVu/D13pDvEI3ONBlNEpPUOwfnttU2C5rRp2ayXl0X54PCKTHS/5u/wHMx7t4K2zAfKh5gADdVdcJDSi4ki9PFNyozljJO2mvX8Q5XUzbAYwbPCMQujACimvXjsF7avcPGW2BnbCLXgBnkE/lAA5X6Pb4j+6Ksjjvoaobg6zI7z3TeOgSo3eoRyaYGaSL4Gag5kKAOrksncpCMiBdFDt9zOu7FwIESmqZoH8Dv2fl5LtBeief9sdqBLaRLYbVc37EWPtbT8RsCqqfBbmGhlaP+FlOs4wWLGLwElQ433gK1ffPL+Nv7 NrnBftmw rPPfh9zZC1TsprezH6nhJgz69bp1nKVk5aM0RDkYK0yRFvWtTwVeixwIT3V+1ufdj5ikC0HR2bXmU1cKfHePb9XaKW2fScnUJ5nSS3E088cR+Zg81NldiGV11PDEUCCeHR+fxKWQmp/ycHkjJmW/zIgA3VmF8O98L9mapCNi+sb1ZObZbxtjiCinR5Cea4yHtAIAjne7rQmv1hbKVGGeiVLj3RFgujW9XgRl5iq5mf5c9HZmmqqBSB4mYZK8hBX8572oqXg4Zc5EllL8S1Wx5lhalkQ== 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 2/18/26 17:39, AnishMulay wrote: > Currently, the migration test asserts that numa_available() returns 0. > On systems where NUMA is not available (returning -1), such as certain > ARM64 configurations or single-node systems, this assertion fails and > crashes the test. Single-node system (my notebook) $ ./migration TAP version 13 1..6 # Starting 6 tests from 1 test cases. # RUN migration.private_anon ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon ok 1 migration.private_anon # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon ok 2 migration.shared_anon # SKIP Not enough threads or NUMA nodes available # RUN migration.private_anon_thp ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon_thp ok 3 migration.private_anon_thp # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon_thp ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon_thp ok 4 migration.shared_anon_thp # SKIP Not enough threads or NUMA nodes available # RUN migration.private_anon_htlb ... # SKIP Not enough threads or NUMA nodes available # OK migration.private_anon_htlb ok 5 migration.private_anon_htlb # SKIP Not enough threads or NUMA nodes available # RUN migration.shared_anon_htlb ... # SKIP Not enough threads or NUMA nodes available # OK migration.shared_anon_htlb ok 6 migration.shared_anon_htlb # SKIP Not enough threads or NUMA nodes available # PASSED: 6 / 6 tests passed. # 6 skipped test(s) detected. Consider enabling relevant config options to improve coverage. # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:6 error:0 What numa_available() really checks is if the kernel supports NUMA by trying get_mempolicy(). If that fails with ENOSYS or EPERM. That should mostly (cases we care about) be the case if the kernel is compiled without CONFIG_NUMA. So a better description here would be "On kernels without CONFIG_NUMA, this assertion ..." Given that tools/testing/selftests/mm/config does not include CONFIG_NUMA, I think we want to add here Fixes: 0c2d08728470b ("mm: add selftests for migration entries") Acked-by: David Hildenbrand (Arm) -- Cheers, David