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b=aSyXENQuJfnTxDjXr1pmvzNwf4pXpivIM0rTS/Pt/0wvNDJRv8dfY29qiUN0kAJll Nb0CVTedvjqG/VqpsXtDq65PM2Tn3FH7Z0Xgk0su1SLcH45twx6K3t/oC1eGmkMryj mwHV4vnRZWAuLT9Y/ljCVihqO3s5Jzk1VBL66A8A= Date: Fri, 11 Sep 2026 22:37:28 -0700 From: Andrew Morton To: David Rientjes Cc: "David Hildenbrand (Arm)" , Christoph Lameter , Vlastimil Babka , Mathieu Desnoyers , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sarthak Sharma Subject: Re: [patch v3] mm: test_vmstat: add synthetic benchmark for vm stats Message-Id: <20260911223728.dfceedb4135e0b758df0ddd6@linux-foundation.org> In-Reply-To: <014ef68b-6312-bcdc-f432-34c31476fe77@google.com> References: <014ef68b-6312-bcdc-f432-34c31476fe77@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: A35F580003 X-Stat-Signature: jeatg4ramiswjcmn684rz3nuy8ay1d9g X-HE-Tag: 1789191450-843599 X-HE-Meta: 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 SWd2/2ib qdtF8u51Z5zuck8qMckQxa+1kvaDaWIplPWNmYduuYVKRji8QQ7gvbEwLi4xTi1ro0UN4g1pleBu2/+1m6acIoZZWls93FqJi1adg9ukCzqvG+BaSjfCv2N9Q9AMcaI3Y3cLNlC6vgoF/5ip4aphp0CIYnbnhEgdUzPwENge7Dyehx6PIDigojTuV1vaI9mLS5DSx6rCh+L72W4gFez31KM4PokNo3Iq72ov2IqYbpd0lARYkYav6rBSxHw2oCCaHPMc8crjeU/Oa6JrXw4iN9TuSCbnJxrVheXxRwWGt6ce8vXExxL+btFFg+t0VbSSMJcfDWZPpBQthBFJzc1Adfnexm38U/n163FT17ravjskDFUPxzP/TiQ38KkMFSdqUIYRR Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 11 Sep 2026 18:08:14 -0700 (PDT) David Rientjes wrote: > 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 KUnit or doing modprobe vmstat_kunit directly. Can you please quote some typical kernel output in the changelog? That will help others to review the proposed change. Sashiko made what appear to be some good points: https://sashiko.dev/#/patchset/014ef68b-6312-bcdc-f432-34c31476fe77@google.com