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[109.81.80.79]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47f85c67339sm3865344f8f.31.2026.07.22.01.07.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jul 2026 01:07:54 -0700 (PDT) Date: Wed, 22 Jul 2026 10:07:53 +0200 From: Michal Hocko To: deepakraog Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] mm: vmpressure: scale sampling window with machine size Message-ID: References: <20260715143646.15828-1-gaikwad.dcg@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260715143646.15828-1-gaikwad.dcg@gmail.com> X-Rspamd-Queue-Id: 72C0480003 X-Stat-Signature: fb9m844odhzhxgxeruz488gmci7ow63h X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1784707676-46360 X-HE-Meta: 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 LA7fi/Jv z96CjsbvQW2P+1xlrvOuB6ZJoOEM554GTrzLaZtFDyfVfZdZqPkRA1kJL7AZKczYnqApNP2qy2ziJ39VUCuNH6rDAxlyUNL9M+FP98QuxAWQV+BNr5p9d4us8J+IHFdfQPeD+ZWpQKkwlLX8r+UkkOU5w11x+X0508mDdU2XBzNmpaHch2tqz7ZQXHhU9LDhlONaBoyGK0LJgNfrzgjXB2//tkmMTAJqmdDXVh2JpqWCzA38whIArQqJHOniuYSbfEzGqXycwVTKVHx1uoVQvNnhIHIxJ+b1+zl3o83DCZpl96dMclGeOj2ljHDkKlhCekoSMwIXhF5fxRcRPiCnyAW7O+zLlccuwbXJcGpBoyp1h4xSape0IIHRbP+B5ffdggxbejGlTbIPfigVGLvWb/Z8gQPzlEZ4+NPiRUc7+1pfrUGYXwLXsbIEbMQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed 15-07-26 20:06:41, deepakraog wrote: > The vmpressure window size was fixed at 512 pages (SWAP_CLUSTER_MAX * 16). > Scale it at boot from total memory and CPU count using the same fls-based > formula as vmstat per-zone thresholds, clamped between 128 and 2048 pages. This is not giving us any rationale why this is needed or desirable. -- Michal Hocko SUSE Labs