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 B36C7C43458 for ; Wed, 1 Jul 2026 08:54:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 887BE6B00AB; Wed, 1 Jul 2026 04:54:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 85E1B6B00AC; Wed, 1 Jul 2026 04:54:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 776966B00B2; Wed, 1 Jul 2026 04:54:32 -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 4B6366B00AB for ; Wed, 1 Jul 2026 04:54:32 -0400 (EDT) Received: from smtpin26.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id CC13C1A024C for ; Wed, 1 Jul 2026 08:54:31 +0000 (UTC) X-FDA: 84939596742.26.210D87E Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf06.hostedemail.com (Postfix) with ESMTP id 13752180002 for ; Wed, 1 Jul 2026 08:54:29 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="hP8v8/0N"; spf=pass (imf06.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1782896070; b=ReYd8oNM/QoxqbsaJ+DurhLxaqGcvzi5dG7qr+PVXC9HseQ0CNXxnMyfZiGw5MwppnuAE6 NLL9t57klj/BP++vcGK1hcAIr1W0dtm35SWPoRtBs2m80C/Wo4FpuGy5aEnwwLLfqoZfpL Qad8FTozOXBT2QXpcZ2RN2IVtCg1qws= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1782896070; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=uYVQIlwEfjilOow910BIkxI5FyBqsmJxN4ghTULpcag=; b=W9niyXHcr2GRDapOvrTVhaRG06t+xYoXtaZCgUQHOeLQiRGk5/wcs33nxrrvDDbMoVBesJ jja0L8pNj/jLBqRGHAdsx3DOPVckOVzqpzrtUfTvJTwWthtxHg6/4sg5NMbLeYJtbQPjBV Rudpu7b/VjRpgYTYrxwRjwAeuZX2J8g= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="hP8v8/0N"; spf=pass (imf06.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 585B4423D7; Wed, 1 Jul 2026 08:54:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6616D1F000E9; Wed, 1 Jul 2026 08:54:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782896069; bh=uYVQIlwEfjilOow910BIkxI5FyBqsmJxN4ghTULpcag=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=hP8v8/0NFELNx7n3MBOKIe3+wR3FZECmPHN8OMzS1Z+7PI8CDHPZL6/DAhC3d2j6k JQncU2m57nDJqNLglA78EdNPuFYWTar8iTUMi1ygT9xB5JyakzTKKv1DiDbGUiuNJj TSVTh1SV41ASts259mfQ+khhbYPuD0qudHIsklGoKVSR7q0CFNx95n2LKg0HcDMAkZ uJy3l11M9gc2fwF4OcYkwrZX0KKTX8r6JdTq7DFSeXaN5A+x4jT6iZqwzNtv0qVxkm D6EfuAbTbOUZr/K2zrR7jALND7Fgi0Us5MO5gQTPsFI+6PAbkzt6lg3Yogsfl3QECC 7zGoT0Hq1i1kA== Message-ID: <3fb5ee48-259c-4c25-a749-1e6b2aa10ae2@kernel.org> Date: Wed, 1 Jul 2026 10:54:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] mm/compaction: stop recording free page order in page->private To: Zi Yan , Baolin Wang , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Lorenzo Stoakes , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Mike Rapoport Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260628-keep-subpage-private-zero-at-free-v1-0-f4ce3930d10f@nvidia.com> <20260628-keep-subpage-private-zero-at-free-v1-1-f4ce3930d10f@nvidia.com> <4154c23d-faac-4d84-990e-a9a0aec5ed46@linux.alibaba.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 13752180002 X-Stat-Signature: ax1ft5xhpd7d8pb1kw95tdpxsc3nej5j X-HE-Tag: 1782896069-309788 X-HE-Meta: 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 hqIQfpBe PVN+3zXlo9N2RLovJHePKYM5FjrP+FvMxyoQsLdT4HVwzTsARZPBi/0e9NlA9BaRWRDgZlzTG9BMzK2NpRlkTmvUfWugTAVJzFVeHixpAq/ryheZaYxZZYNGHEeh7yNlc2RJdREMiFOeE7uJqIuZ22LpLMgJ3/UP4ldNguygqNea5So9HnJ/h/xh75dWuTSwJa7L7e6ykI++IZ4RqLze4hef11wLolG/c6p9E+hBH024dKDJthnky8ezmzraT/sdxY4f+4FcAFVdiMSnFB816TS+GcUO5fVTaaBalME8sOPPE0MVfK5EEiAbvfZJXA2o5yZjDO+gnby/76ZVjVn9DX41twirYbCkfWo+Xvz7WxWIxnmZbVk4lo6eGQA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/30/26 03:37, Zi Yan wrote: > On Mon Jun 29, 2026 at 9:32 PM EDT, Baolin Wang wrote: >> >> >> On 6/29/26 10:56 AM, Zi Yan wrote: >>> Commit 733aea0b3a7bb ("mm/compaction: add support for >0 order folio >>> memory compaction.") stores isolated free pages in an array indexed by free >>> page orders, it is no longer needed to store the order in each page's >>> ->private field. And there is no code using the stored order. Stop doing >>> that. >>> >>> It also prepares for an upcoming change that ensures subpage->private is >> >> I noticed that people tend to avoid using the term "subpage" now, though >> I understand what you mean by it here. :) >> >> [1] https://lore.kernel.org/all/20260623125723.2503832-1-dev.jain@arm.com/ > > Thanks. I was confused which to use subpage or tail page. Now I know > tail page is the way to go. Agreed, and agreed that the large comment is not required here. Reviewed-by: David Hildenbrand (Arm) -- Cheers, David