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b=03JWdFRtvhR6VDV6l0PUGA1DVunpqddI6VSWXI7dNneFUwRvZ3V6Dx7U6aGRkK3M7 PLcfwDkv+py26b0n8Lj5Y0GA2w1/IcEx6iHOlg7lrm7IlsnrZ1AEovAIcVX0coIofm Wj8rKpOXWwJABIA1jG+/4VHCfqVr+8y0MsMXWmI8= Date: Mon, 31 Aug 2026 10:09:44 -0700 From: Andrew Morton To: "Lorenzo Stoakes (ARM)" Cc: Taha Sezer , david@kernel.org, vbabka@kernel.org, mhocko@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: vmpressure: scale window size based on machine memory Message-Id: <20260831100944.ccb2a8fe3b036ff7a258820a@linux-foundation.org> In-Reply-To: References: <20260831130316.448-1-tahasezer.is@gmail.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: rspam04 X-Rspamd-Queue-Id: A17F6180003 X-Stat-Signature: n1hb88zy9py1e5cxxqwtm91ynxzijw9a X-HE-Tag: 1788196186-84490 X-HE-Meta: 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 WN7Y++y6 VVewBt3geo5h5BHcnY3z0zzjG5OiVouYrBsG5u21vv8lxjvpqaiYWp+I0Lxq80Q8IF/wmeUSv0QlXTP96PpoPhK48iO4sFIP2h13Bkfsbb6F3OXyfemnIcQ7X9MU6Iq+MvJGHjJicye3+JzgprqQ3cfK2hVDWNLgDB3Tg4II6rieB4IzgfqxzoUrtDdhrwNDmwq/4xYOEI9Em60vxaY0PD4GD2Tu6at3yM/haSkNCCWSdV8FWGgs/ts7MpoFmew2u+RO6Tl1fKhlblO8H5Zn6uSxj6qRrVQZU6JjQUn7Lv91/c/1EaOBA6fbTS7140QAe0Bi3U4+LoqwJwIN9twnVBbZvrN+yp+DFIDFHTyiC49jz3x6YKMO621d4w396rIWTuwmudj3UeRynBHF1QpIocc6bH5HvByLTxGx9o+rnM3ROyfrfTFs61ws7qQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 31 Aug 2026 14:27:32 +0100 "Lorenzo Stoakes (ARM)" wrote: > I do have to ask if you're using an LLM here? If so, it isn't a very good one ;) I asked Gemini to write a reproducer for the Sashiko report (https://sashiko.dev/#/patchset/20260831130316.448-1-tahasezer.is@gmail.com) and Gemini told me : You spotted a severe mathematical regression in that commit. Your : analysis is entirely correct: the patch actually shrinks the : vmpressure window size for almost every machine on Earth (up to 8 TB : of RAM), doing the exact opposite of its stated goal. : [much more]