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b=DDgMmp3bPTCKqKWHXJGkt6fiCN0NUJy6HkHGTlhL13P6vcB7QZWAOj/UOeJvm1ct3 1EQebYe4v54l9LpByU5ciXP61GO+kVlEYaJXEGZWbOz8oieribmiPe8541HNszyUaH 5QPJjJklIxmTHE9lZ7yLaUan4VmtzRsXkY6DlApG2NAzbW0xvmADr8tPY1ojbuGhTe 3LolNcZZrUW7ob2hYnnPg8eYwy6M4ZHPnDQVhpiMhBP2zSA/9SBnt1NDYSc8PedKka K5gl+jiYYta9J4IHHE3bDHXdznLrEFiK2Yv1QuMwc1yyooW2/4Kfftt0XOPpvyzC73 P0ICSNLO9RVqA== Message-ID: <42703e8b-cec3-496b-9c76-4dfc35ad469f@kernel.org> Date: Thu, 10 Sep 2026 11:40:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch v2] lib: test_vmstat: add synthetic benchmark for vm stats To: David Rientjes , Andrew Morton , Christoph Lameter Cc: Vlastimil Babka , Mathieu Desnoyers , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sarthak Sharma References: <94068447-f9c5-ba84-73be-bf492277b9b3@google.com> <6136773e-b134-070e-36fe-2951aa25b5fe@google.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: <6136773e-b134-070e-36fe-2951aa25b5fe@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 7A619180004 X-Stat-Signature: 6cmqbhfntzripa81t4zr5pzjkrokiuzk X-HE-Tag: 1789033235-932808 X-HE-Meta: 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 /yghSDdl QRi7peB0Ktx0yJVxRz1vPeDnx4XM9G9JqzwPhc46YjTfqmg3VDOCXuj0/0zqcDG0OhCkr32J1qk4Hw2HkFgWOKNpIVi7mrXV7C03wsJr7PoBFvo0EcqT6DpnSthPUnYkKEJsYoG0VTnvkQFXeYZ+IDzrADX8RAmO3I3Wc748oHdL0DXyiJgMVujuO+HYd5fuVv8Sg0tQhb/niUbuSZChEmzwsoZ/9PoUPo7ItERkOO2sTBN5OR93wrfl0GUyc0ITTpoyr1b8EWJIUa7JaxLrAXSkPJA1YAGhDVij/Fji2wljYINBUO5U3u81bIny1W8X57CqXF6/kui46Toj60xbvQ1BIcnSV1m9HfQArsqo2TOUEJ1nFeEK3KFmOcwNsX1qnLaMQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/22/26 01:52, David Rientjes wrote: > On Fri, 7 Aug 2026, David Rientjes wrote: > >> On Sun, 2 Aug 2026, David Rientjes wrote: >> >>> From: Christoph Lameter >>> >>> Add a synthetic benchmark that can be used to measure performance of VM >>> statistics. This is used to analyze any improvements or regressions in >>> functions that are frequently used in hot code paths. >>> >>> The test is run by inserting the module: modprobe test_vmstat >>> The module insertion will always fail so that it is automatically >>> unloaded; the results are in the kernel log. >>> >>> Signed-off-by: Christoph Lameter >>> Signed-off-by: David Rientjes >>> --- >>> v2: >>> - added bash wrapper to ksft per David >>> - integrated into ksft >>> - added MAINTAINERS entry per David >>> - fixed alloc_page() error code per Usama >>> >>> Adding single test for now to solicit feedback before updating the other >>> two. >>> >> >> Any feedback for this one? If this one looks good then I can also apply >> the same treatment for test_pagealloc and test_slab. >> > > Andrew, David, any thoughts on whether this one is acceptable for merge? > If this looks structually correct and is staged for inclusion, then I'll > do the same treatment to the other two proposed tests as well. Please send new revisions next time not as reply to previous revisions, makes it easier to miss them ;) I still dislike placing them in lib/ but as discussed, we can handle that separately (CCing Sarthak). As replied to v1, is there any chance we could convert some of that to kunit? -- Cheers, David