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[109.81.20.148]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483c3b770c2sm263183375e9.10.2026.03.02.00.56.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Mar 2026 00:56:39 -0800 (PST) Date: Mon, 2 Mar 2026 09:56:38 +0100 From: Michal Hocko To: Benjamin Lee McQueen Cc: akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/vmpressure: scale window size based on machine memory and CPU count Message-ID: References: <20260227221555.29969-1-mcq@disroot.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260227221555.29969-1-mcq@disroot.org> X-Rspam-User: X-Stat-Signature: i1pb4hi1jfe36skfdqbynedfmxnstzef X-Rspamd-Queue-Id: 09E6F100005 X-Rspamd-Server: rspam03 X-HE-Tag: 1772441801-347309 X-HE-Meta: U2FsdGVkX18mhJFSMJrUWVUEwS4/5cDwPUDNo7uk9COIdIC8unCtZ5UkXqisgz2nNh0pr3/JIi70gqTOF9429Gq5raDntBR/tTbxqXsssWIiWl8SRQ9K0r8hgtvpE9+5j/SB3S24aHpiQdOL0pDFP2kKwQ8PpnsOW6BiDz+1QjyZRpjIjIe9tV/kDdjVu7I8By5jEwOnvp/DKslD/9IoxPnGRTKGbuKkOXpRdkQ2E12k2iYAvcyUkaqRGdQLmwf0XD49A7tWJZH7uvwVnw2Daknglt7NdrJjaeh/XsQyldlcgGXqHTZdQhitp1pQV2yk6yZgWoi65Bx1IeT2EPZ2vorw0MY4/nmZ/AhdVzFWYK54im/J9tLr4Q60bchixBA5eaBSIpDdqJv9HESKM/8bAHqCrPa2uXkXiQTRaJskd0lCpD+2AGZMEtdQhVBxHA153VehitfmmTa0tbyi0HjGG4+Xv4hpV93pI/VhBsVz8sD2fM5WawgSFJCGQwzab9Mh9cv4nVCT9Ij0qGoXcbmUrMT1+uc0d7029isf3JnK4am8VmWMLeAvQdVlVVrfwvRrZFGuAL9YGcjINF7WqbrCn8jCgTfaFz+TsAWT7m6qmySQ7uWX897od7Z+jsO4y7qcLbLEFjTTqNj7yV1FNXjXjJCZcKlI9H4C/5304DDR+a0c/adTAGYReILm2Us5RoMeUlbImz3kYhNpmrF1MQ50oetWc9gxTio5Bm74VIq/eL7BYFa8dN9D7OcAn6hVBnNpSR9rlaJl+Yw/f0sSAfdVHfNxUtvBK++mDeAdxeCXQxIBkiSQ3Eav3ohPkGMnv4WGE7wtyiwnslHiS57ORP8fn2njzMpgDoRBK+jJTFVVuszER5fECQj3whmCaABdsLVMzG3cxfnbjwofFdJwd5JOVtWl211o2nVzOgiSgdRSDJGKaXEcNottxPRFkZGUlZVyfksoOxh13l+ILSTvtdp D0/lmU+3 lNJ3guR8D7pB8qas9fjoToRPBhN/+/WQNbt1qo00o13poZYsL+ScYJs/Hi9M1tUKSEOQgUbA7ritxEFXbkDZEqh/6rR0PpE567GgRvjL2DkrN1SdfFlnlOcbF+0oQl7PKOi1Ti1Yhh3DskaLAPs6Z+u8Q1K0UVzP4G4BDJO1R3us+FPqN6WA8Gv38gor/STf+aXIOOGs51Cw117cHO5c4N4yqIbT9Z/FJKIbXxPkzioS3tjnC7oT37QMSySGBsCQnVTa0r/VAbsIVl7LmHJ3qldWxm8mLI6g7pk+bZo0ylU7JjQc8Ino5vJbbxI0ce9ZF8BMPo4gBNlTPmUljKXX6TFclM1wfNokw+2xEe+sDtatsNeTCgHEp8ePEWAVr962lYf0W Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri 27-02-26 16:15:55, Benjamin Lee McQueen wrote: > on systems of different sizes, the fixed 512 page window may not > be suitable and cause excessive false positive memory pressure > notifications. Please be more specific about the issue you are trying to have fixed. The above is way too generic. How much memory the system has, what do you consider false positive and why. What is the workload. Etc... > or should window size be capped to avoid excessive notification > delays on very large systems? > > v2: better commit msg, also tried to fix the whitespace. Also please refrain from sending new versions in a quick succession and wait for more feedback to come. Last but not lease if this is a more of an idea rather than something aimed to be merged make the fact explicit by RFC prefix to PATCH. There is much more you can read about the process in Documentation/process/ Thanks -- Michal Hocko SUSE Labs