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 1E906E7BDA1 for ; Mon, 16 Feb 2026 11:34:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 771436B0005; Mon, 16 Feb 2026 06:34:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 71EE86B0088; Mon, 16 Feb 2026 06:34:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 62ABC6B0089; Mon, 16 Feb 2026 06:34:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 50E216B0005 for ; Mon, 16 Feb 2026 06:34:42 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 27558BDEE6 for ; Mon, 16 Feb 2026 11:34:42 +0000 (UTC) X-FDA: 84450112404.23.9D29356 Received: from flow-b4-smtp.messagingengine.com (flow-b4-smtp.messagingengine.com [202.12.124.139]) by imf04.hostedemail.com (Postfix) with ESMTP id 1330440015 for ; Mon, 16 Feb 2026 11:34:39 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=shutemov.name header.s=fm1 header.b="I O+f4JR"; dkim=pass header.d=messagingengine.com header.s=fm3 header.b=rvjtXAI7; spf=pass (imf04.hostedemail.com: domain of kirill@shutemov.name designates 202.12.124.139 as permitted sender) smtp.mailfrom=kirill@shutemov.name; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771241680; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Z/44F5g7jPHoL3CaGxYN0FVETrlse7APjvGYt7mfjgQ=; b=Io6Bx3KZcWFdlMAtWIjYlD7P8ls97UahQJS8kfZB7Qu3CbkLjeh4NAJy9tcatqryRL0HAP R+VPUDRQdSvm4oL7B3RDP11VIdDpnxUe3z8iSOo2u5PrK83hUoskLXYNiDRuU0EPV2TLJk /5gqjsq5Ah92litPD2mmTOsm/m+CjGc= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=shutemov.name header.s=fm1 header.b="I O+f4JR"; dkim=pass header.d=messagingengine.com header.s=fm3 header.b=rvjtXAI7; spf=pass (imf04.hostedemail.com: domain of kirill@shutemov.name designates 202.12.124.139 as permitted sender) smtp.mailfrom=kirill@shutemov.name; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771241680; a=rsa-sha256; cv=none; b=hLguWr6iK59eCGf4FUOiG4Slh5Jh39uqD0nTyhnjAKucwLCg3HuIyOFGQtoVTZo0PHf/yZ rsRgVWtBul3xpDBtYV2jhgHnGLagK4iYjSbqvy+F4zHjJw9YKkF/BMFIp+YG3Ggh7Zw2TL wYiIAu5OZXE9JHnls44/Dzo07eMaTnw= Received: from phl-compute-05.internal (phl-compute-05.internal [10.202.2.45]) by mailflow.stl.internal (Postfix) with ESMTP id 814A61300D47; Mon, 16 Feb 2026 06:34:38 -0500 (EST) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-05.internal (MEProxy); Mon, 16 Feb 2026 06:34:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov.name; h=cc:cc:content-type:content-type:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=fm1; t=1771241678; x= 1771248878; bh=Z/44F5g7jPHoL3CaGxYN0FVETrlse7APjvGYt7mfjgQ=; b=I O+f4JRfJq8NTsHdTvzrCpZfpB8D42zJfi5Bz9lRt3Swa+2LQjMIWEAPNabX9P/sq D60bAm9dssTXXmLmZVLzadJDx+3rNzDPUPXE3qFvxJsbwb8f/ClYpbsS68xtsPm0 0fVsvEqhiSPjVSu19eky8EcRDKjCPe3QFXSkMHoPOWPHYJlcB/mURQXGsE3IKZCb uok+Yw2PG9m8GRIBoUdhGk0ivPMGcljH/yMQNrVq0DRw8idU2395Q3VBOa0pZ1fn 0uO5xmbHm8/zn+NQK0WvDBBHYsx4i5wr0Tw4HhRihMKTwnedWFO4YsW4WQBHKyQ5 hxcnVezTcAqjJ0LF2mPXA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:content-type:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:subject:subject:to :to:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm3; t= 1771241678; x=1771248878; bh=Z/44F5g7jPHoL3CaGxYN0FVETrlse7APjvG Yt7mfjgQ=; b=rvjtXAI75i+J4WNsGFBYenrpr07UW7dVws1Unk/4buJ93hJpRxf htIWpbKV5+JcfCNX/9oy6mT1KbWmOKntALKMEs5dSMJVryqzje/Ge2qu95Sug6mj lwhzPNVH0pl5y4xpZqSbRvVyFp35zMJUcchevgrJm8fPV0hHmFzJFTlPDO3Ly1FT A8MntdTIxPVfl6VkuxavY4nkhHX8xH7RYCQG/wMHndq920PL8cT3eUeAZA8JiSmc veGay6ys0lg2wFFwhEAFuENq+lVUGzdWozt32CG8IVBnJlA8XrVMm9/HgxfCPeev mt9s2ZQQUFF3ZTKgfHrxLQhG2JTXSCu3EKg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgddvudeijeeiucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhepfffhvfevuffkfhggtggujgesthdtredttddtvdenucfhrhhomhepmfhirhihlhcu ufhhuhhtshgvmhgruhcuoehkihhrihhllhesshhhuhhtvghmohhvrdhnrghmvgeqnecugg ftrfgrthhtvghrnhepfeetheejudeujeeikeetudelvdevkeefuddtkedvtdehtdetieeu ieetjeeugedtnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrh homhepkhhirhhilhhlsehshhhuthgvmhhovhdrnhgrmhgvpdhnsggprhgtphhtthhopedv vddpmhhouggvpehsmhhtphhouhhtpdhrtghpthhtohephhgrohifvghntghhrghovddvse hgmhgrihhlrdgtohhmpdhrtghpthhtoheprghkphhmsehlihhnuhigqdhfohhunhgurght ihhonhdrohhrghdprhgtphhtthhopegurghvihgusehkvghrnhgvlhdrohhrghdprhgtph htthhopehlohhrvghniihordhsthhorghkvghssehorhgrtghlvgdrtghomhdprhgtphht thhopehlihgrmhdrhhhofihlvghtthesohhrrggtlhgvrdgtohhmpdhrtghpthhtohepvh gsrggskhgrsehsuhhsvgdrtgiipdhrtghpthhtoheprhhpphhtsehkvghrnhgvlhdrohhr ghdprhgtphhtthhopehsuhhrvghnsgesghhoohhglhgvrdgtohhmpdhrtghpthhtohepmh hhohgtkhhosehsuhhsvgdrtghomh X-ME-Proxy: Feedback-ID: ie3994620:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 16 Feb 2026 06:34:35 -0500 (EST) Date: Mon, 16 Feb 2026 11:34:30 +0000 From: Kiryl Shutsemau To: Wenchao Hao Cc: 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: Re: [PATCH] mm: Add AnonZero accounting for zero-filled anonymous pages Message-ID: References: <20260214084514.2842745-1-haowenchao22@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260214084514.2842745-1-haowenchao22@gmail.com> X-Stat-Signature: 3ysewoc76y6mw4iztffsqy4ex9u1fb8o X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1330440015 X-HE-Tag: 1771241679-424009 X-HE-Meta: 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 TOB0M1S2 ZTiNJYCWlj9Kr18g/Tp5fznXjBKR3dRH1RXjL/xirTa80H1ZbDcmketdhC72KeJnQlOijVdGuGron7HYJI32lFCKgPsYexUEaaUOj536bQPDwCgGHZPscR5/jI3bv0xbWF01n0Z9n3znK5Nrhoh7BRZ2kJllB3j7CurijEuPhQwDCoP32TVuYR3yBNIUYmbJHnVw2+q9F2VV5GBU48ddN0PlItzq/WdkKBh2Y5GmrSwavp7XNRxBJyPucAbre1w4rpy5oDnsEyRXNVMsMyLV0t+kKLjADoQvLA84YSxxC7lGM7v+kGfzRHATfKwACcuR240RFB8CFSEGD+9bRK1o6nnocAeZ8+9MYJXy+lG7YssUGDxEBdhUU7OM8BGli7UTmLElNLW6Qv85ji3fT33Ld6Z+sQxsAKcyn2zDvLQ2+yapymzjOvgSRG184kdGbVVYCPUhG X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, Feb 14, 2026 at 04:45:14PM +0800, Wenchao Hao wrote: > Add kernel command line option "count_zero_page" to track anonymous pages > have been allocated and mapped to userspace but zero-filled. > > This feature is mainly used to debug large folio mechanism, which > pre-allocates and map more pages than actually needed, leading to memory > waste from unaccessed pages. > > Export the result in /proc/pid/smaps as "AnonZero" field. I expect it to slowdown /proc/pid/smaps read substantially. I don't think this line in smaps worth it. -- Kiryl Shutsemau / Kirill A. Shutemov