From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C0546C44511 for ; Thu, 16 Jul 2026 15:37:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8B5576B0137; Thu, 16 Jul 2026 11:37:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 83E996B013A; Thu, 16 Jul 2026 11:37:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6E01B6B013B; Thu, 16 Jul 2026 11:37:50 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 2E5656B0137 for ; Thu, 16 Jul 2026 11:37:50 -0400 (EDT) Received: from smtpin19.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 4E72D4010C for ; Thu, 16 Jul 2026 11:57:48 +0000 (UTC) X-FDA: 84994490616.19.916CE89 Received: from mail-pj1-f41.google.com (mail-pj1-f41.google.com [209.85.216.41]) by imf20.hostedemail.com (Postfix) with ESMTP id 6FCFE1C0009 for ; Thu, 16 Jul 2026 11:57:46 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20251104 header.b=HchRbsDx; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf20.hostedemail.com: domain of gaikwad.dcg@gmail.com designates 209.85.216.41 as permitted sender) smtp.mailfrom=gaikwad.dcg@gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1784203066; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=T7BZuoI307tBezRmKGV6QjCvxEl1tGf+05F5S3uKZHA=; b=I6YXKGT8wVhKvT+R/HVdYxht9QP+/znkcwHyNcQOb3QuydUw8OJu7cYVSUiJn+ctHxlaOA +iZmWKYeoX5z084Tl4jxZ5rpCOxGKoO/YmrDNNCOwlV0mAOkhr/07RGPK4sFSx5M3nmerU +AbX7OFt5RJUWVCD2vosqj7HKOVuqHw= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20251104 header.b=HchRbsDx; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf20.hostedemail.com: domain of gaikwad.dcg@gmail.com designates 209.85.216.41 as permitted sender) smtp.mailfrom=gaikwad.dcg@gmail.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1784203066; b=rIVjf6tvKA4JxBk1Xd+0qkrXUW9951I9jLTwr+zl/ETJUssW/m7KwP2JDmm2knIM6U40Yz UUmIJxjuWiWRGWxTxigskTF/1+5I1XEHF7uLQLRsovK4k6L/Vwj7YvtCDDIow2OQxUS8qI F+iwbAF5CsCc3q0G1UDMvi3izwg3vjA= Received: by mail-pj1-f41.google.com with SMTP id 98e67ed59e1d1-38de840f2f0so3353826a91.0 for ; Thu, 16 Jul 2026 04:57:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1784203065; x=1784807865; darn=kvack.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:sender:from:to:cc:subject:date :message-id:reply-to:content-type; bh=T7BZuoI307tBezRmKGV6QjCvxEl1tGf+05F5S3uKZHA=; b=HchRbsDx+0abYFhA+oFGDD0+zQYSsp9V9KapoUVAYdMKUI1gWf9aVL6FArtd95bGzE DvzBG2QVj8Y5uCnjCeFkw3PdIF25ZLg444T0uowRCyR5E/1Loggd06E4GfktU/gyKQkU ttSSuQ1wJX/+YnQy5uI+05jh43ji++yXew7+qvFv37tKKycOsaKfzeA9RbLiCw9Mxknj 4Ie+sniE+PnDYjnok7yF97IsBwk3hEQQiPyAjJYS9tYk9kTQAj/O4XQxXJTkj9g+m0+p inQ59oEkaBQ4idrhZxdhfAnOGn18hE/QdF4+v85xbc3/AFnMwGQ+FlUAd6zxCHAEKLEm wNYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784203065; x=1784807865; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:sender:x-gm-gg:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to:content-type; bh=T7BZuoI307tBezRmKGV6QjCvxEl1tGf+05F5S3uKZHA=; b=QpIdrDk/Rb+qxcOMYB5T8Hg9WUK7Jk/pH/noo0kArMBQB+LcyWm++UvRE9CyWvP++G 3AnlJH/1CkakMUT1aOEmGqWcFYHNT+ZH6LlaWmz1jLrq0j02DB8jKfi1lXWPIQzwlug7 P+SYqBUf7NHNxgoR+M1j8KO2pSKTM6C2SneB+fh9XTYta044HUFQxCQbH49VvpfwaWno x8u0sPU4gM+YdwP/2tmIvJK8r3e5VgvrPOt9Cx6iIjnE+GD7fV1yMxE5hpnbaF5+0gZB ozAj6SOnLiPR1jSImdq9WZwbQoZ9Ltkga0kfhnad7xRgvZ+2MBxXtTNuovy4D1DS0yvP XS/w== X-Forwarded-Encrypted: i=1; AHgh+RoxGDuZ8QcBewkkrCAizQUWJdp0BrJ7BiV43F1+MELKbRNYPtfKZW9yplAllsQISYJT98btlidBAQ==@kvack.org X-Gm-Message-State: AOJu0Yy4pGxVZDe0Jaoo0oSFVrU7lWZxBxCdYiHZQeWwVVrfoRChVOM3 MA+5bDmxhLwq2h2TcufrauI4wk6by8uaXrbtQGnpISICCkZzqo0vLExM X-Gm-Gg: AfdE7cnA7yXzrtrvvr6uA2vjvggxDk4cU5R5+b4WL61/CLIJ3WL5ZjsfCqyfRuLPuBK nsl3TnfeAPvJJ11sX8POTdy1BL7rXH2oMgDxnPmaTh4DB63x2TGdv0X8n7HICVo5NkDCg+TrqBN igayZxRwIyhKkC+CI0HY1+ZGSm7hxvB/45x3y9uCxMo+/1mYpEppN0J3Im/gXU6TNUu66HR1KCl Gnq1FCA7X8xgy5NXRO+cI4XP+tuIxk+JFghILazx1EDcna82W2/pQS1B6ZtGfvWy0TdL07GfyHg P0csK4q5Sbvr6BWDQDMoK+o/t4fDjlFy1a3bFs+AlrEuElZW27EDIPYa553jG/dbGq1WOqmHuWm Z4ahQLkzSP1bKS4jf3uQlI+X6GlAdbI00ocW4I2zjjkkGQKa4xX3o58wpoZzIxyRP4p/RVBHZrs X2Ajr21K+LMLX1obNSW31LOYKl/Ac/lh6J6TmmRGCl X-Received: by 2002:a17:90b:2f8b:b0:382:3dcc:1487 with SMTP id 98e67ed59e1d1-38dc7b3f5demr19684631a91.25.1784203065127; Thu, 16 Jul 2026 04:57:45 -0700 (PDT) Received: from localhost.localdomain ([2406:7400:90:2db1:9c31:f107:8086:4204]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3140e6ebe98sm10920690eec.26.2026.07.16.04.57.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2026 04:57:44 -0700 (PDT) From: deepakroag To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] feat: scale vmpressure window with machine size Date: Thu, 16 Jul 2026 17:27:30 +0530 Message-ID: <20260716115734.80909-2-gaikwad.dcg@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260716115734.80909-1-gaikwad.dcg@gmail.com> References: <20260716115734.80909-1-gaikwad.dcg@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: ejdtu6r4xnsq1seoicz6fbrd7jsqydpp X-Rspamd-Queue-Id: 6FCFE1C0009 X-Rspamd-Server: rspam01 X-Rspam-User: X-HE-Tag: 1784203066-728921 X-HE-Meta: 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 wKvtrnxP FaYJPror1OJem4IWxVosv0EMUzBXVlsSMCk6+joTrtwUbZwX5cpvMKFHsNP2PE3cso693nKYlrFq00zkUnlyPrP35Ee7kPC9Nqp48O54VV/kYcjDW+7tLZItINetTjry0vTjMPhoGQ+5be/fAADYc5/Vr+TydY934O72Ax/IGTddTIHaeUG2vsrypUVZvz4pgOPWv8G2TC7HpbDbDW9DGESZsW4HHJSvNCz25M+GTYesFiU/Ey3exlfQMG0HojzoyeflH3Xxlmm990aE+TBIHd4mEbvr95tdpaGKY5iqFiwgELP1mcU65aZv4j8NEUmdDUjy0QJIv4joGuLtwE5I6d/WlGdTXlCSelJva36GnVXzMuUCP797xHjTQ0RJyZxVvDADo1vlM/aDCgJEU5JxLjlTMIN1KOgv+p7SbG4bhj+4c64c5DHp1Vy0UMF0xTWlXz1fw1Rvlu5GbH40= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Replace the fixed 512-page vmpressure window with a boot-time value derived from total memory and CPU count, clamped between 128 and 2048 pages. Signed-off-by: deepakroag --- mm/vmpressure.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/mm/vmpressure.c b/mm/vmpressure.c index f053554e5..8925d4ad3 100644 --- a/mm/vmpressure.c +++ b/mm/vmpressure.c @@ -33,9 +33,29 @@ * SWAP_CLUSTER_MAX, it makes sense to use it for the window size as well. * * TODO: Make the window size depend on machine size, as we do for vmstat - * thresholds. Currently we set it to 512 pages (2MB for 4KB pages). + * thresholds. Scales with CPU count and total memory at boot. */ -static const unsigned long vmpressure_win = SWAP_CLUSTER_MAX * 16; +static unsigned long vmpressure_win; + +static unsigned long __init vmpressure_window_size(void) +{ + unsigned long win; + int mem; + + mem = totalram_pages() >> (27 - PAGE_SHIFT); + win = SWAP_CLUSTER_MAX * (unsigned long)fls(num_online_cpus()) * + (1 + fls(mem)); + win = max(win, SWAP_CLUSTER_MAX * 4UL); + win = min(win, SWAP_CLUSTER_MAX * 64UL); + return win; +} + +static int __init vmpressure_win_init(void) +{ + vmpressure_win = vmpressure_window_size(); + return 0; +} +core_initcall(vmpressure_win_init); /* * These thresholds are used when we account memory pressure through -- Deepak Rao Gaikwad