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b=PB1h90kTQ8mw9ftt+Je/B0oATn04C39/MAJwFEl1bdSwsejISNIjj1BAkpOsdLhCQ IDn8YDBZzL8pNFMum53/tAqWJZXkeCm6hmWtVHRVDLScbQfQHenEUZiCOFlyhDoKJM 65DwL9frz4OrIwIcg7qR65T4EtxBE1rInRqwBiqGzzwrh1qqkw/MkhnJoH2thCptqx omJhxGd/d8Kdcbp2aaVL+w6oSPo5llQMp5f8YzQAFY2RbkchR0rHCsHG+ljHwWCjaI peWENJOAQSdTlckPQR6wFAx41E+qa0bRd9OwyQ5cTu5IoZLca3zz90r3julKwsRTwJ N9jit3OujNGmA== Message-ID: Date: Fri, 8 May 2026 22:15:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] selftests/mm: add zone->lock tracepoint verification test To: hawk@kernel.org, Andrew Morton , linux-mm@kvack.org Cc: Vlastimil Babka , Steven Rostedt , Suren Baghdasaryan , Michal Hocko , Zi Yan , Lorenzo Stoakes , Shuah Khan , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kernel-team@cloudflare.com References: <20260508162207.3315781-1-hawk@kernel.org> <20260508162207.3315781-2-hawk@kernel.org> 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: <20260508162207.3315781-2-hawk@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: EB2D1A0004 X-Stat-Signature: 9hx5cquz4559gunsi85swrrsdkkoxuof X-HE-Tag: 1778271352-597395 X-HE-Meta: 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 iAFm7gC5 ILXzrhshzJAT6AdqtSodXslyoB26kjUiV9F9qxhLK7HPNSWCWNfhcvLP3JwAVD+1mgCWRhAsNRXaTaJZRjrlcUnyPtL8kLUWMF1OhwIjlkFa8anCchvEx12alN7E46g0osQ17xBQ+fvtcxIF8mXEPG7eQRjRfHurc9MKvBrGcg6yzHZJA+Uwa6TJuPUJuB0olyPgwyvyPORyP0/g/ck0cuo7Nc71bo8FpNQJHFjcdxWIXa9QXR7fZvGVX1zNm/B1xHeGAzrIr5EpZrzRTuJLN3q+/dg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/8/26 18:22, hawk@kernel.org wrote: > From: Jesper Dangaard Brouer > > Add a selftest to verify the kmem:mm_zone_lock_contended, > kmem:mm_zone_locked, and kmem:mm_zone_lock_unlock tracepoints. > > The test has two components: > > zone_lock_contention.c - a workload that spawns threads doing rapid > page allocation and freeing to generate zone->lock contention. It > shrinks PCP lists via percpu_pagelist_high_fraction to force frequent > free_pcppages_bulk() and rmqueue_bulk() calls. > > test_zone_lock_tracepoints.sh - uses bpftrace to verify tracepoints > exist, have the expected fields, fire under load, and that wait_ns > is populated when contention occurs. > > Signed-off-by: Jesper Dangaard Brouer > --- > tools/testing/selftests/mm/Makefile | 2 + > .../mm/test_zone_lock_tracepoints.sh | 212 ++++++++++++++++++ > .../selftests/mm/zone_lock_contention.c | 166 ++++++++++++++ This really looks excessive and ... not really how we usually treat tracepoints? I don't know about others, but I don't think this is really what we want as a MM selftest. -- Cheers, David