From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 71E4F60A2602 for ; Wed, 28 Oct 2026 13:59:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=ZcpNV/Cy Received: by kanga.kvack.org (Postfix) id 83EC26B05BC; Wed, 28 Oct 2026 09:59:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7EFB46B05BD; Wed, 28 Oct 2026 09:59:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 705926B05BE; Wed, 28 Oct 2026 09:59:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 408396B05BC for ; Wed, 28 Oct 2026 09:59:26 -0400 (EDT) Received: from smtpin15.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 4D84FA08B9 for ; Wed, 28 Oct 2026 13:59:25 +0000 (UTC) X-FDA: 85372192290.15.3702B52 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf30.hostedemail.com (Postfix) with ESMTP id 80CA38000E for ; Wed, 28 Oct 2026 13:59:23 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="ZcpNV/Cy"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf30.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1793195963; 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=lmwsrkba+SRG/AXiVVkwXIp5wUOzmuBRAc0XQagcnRk=; b=kY42mWs7Zto3G8PCabO19HRCXx38VyHOkMcMBxc3prR9bFzgf39w2vnCFadvr7Wl1m7fXT d96ct5+LyTdFHGekzHf6EdyVzxZjsN2uofnSTjy28NPFDmefqcLsTZ+ve/xkPnN/zb5Xum nJBFBaKuZFiRPu0iSdyWMyZ6dLKuQM8= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="ZcpNV/Cy"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf30.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793195963; b=o/smzJSyyomVy9qM7ZcUNTdH9Y24EuQMjhc4HUO04TMPQuCi9uoQK2Y6w/GpRfZ0Yn5Cnp NH+F75Q9l9L2QrcJvbxJRmp461V+z/lAgAoTClVJW3hQYKauv72C/bsYJCkKddA/lbl94h f8JkTmcDhlhf2w/z0XKWLNlMTCz/tvs= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id B8D7A6021D; Wed, 28 Oct 2026 13:59:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46E981F01825; Wed, 28 Oct 2026 13:59:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793195962; bh=lmwsrkba+SRG/AXiVVkwXIp5wUOzmuBRAc0XQagcnRk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=ZcpNV/CyxgZlHYTgc9hz+BHGNvVQTNr2Km24y1NtEAipKrQpWq/PnNnomtVHFa60H fq/dnQtzBNA1YFxuQWUpMKjxRjHD9TL76A4VWNOOD17bBj39UbNmg9IoGsdC8TNibD PzZRXmfWpzc0v4S8HCUxioxzz0nUTL723I738EfkJ/pwmVnZL6fJthMXe+IdRUM8sY 0VSypMLm4xLMThodRtiJupZVx4RrEYAMgTVMyOcxVO6P2TKUWAK91DXgn4+kT3k8kH SlTXh7e9aDUOI5e2xO+fmTOBmGkauVtXIU1nu/qAI16DPgVIp2HS6yRGNMGl8gcDRJ 7uIMThOzuVRBA== Message-ID: Date: Wed, 28 Oct 2026 14:59:11 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/4] mm: pass the number of PTEs to move_pte() To: Andreas Larsson , Imre Kaloz Cc: "David S. Miller" , "Matthew Wilcox (Oracle)" , "Mike Rapoport (IBM)" , Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pedro Falcato , Suren Baghdasaryan , Michal Hocko , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Magnus Lindholm References: <2bc50d2a6829b49ee909e5bb943244859661a40b.1792609488.git.kaloz@kernel.org> <409079fe-ab52-4389-9fe0-d7246eb27bad@kernel.org> <20261027212610.6798-1-kaloz@kernel.org> <20261028091631.8072-1-kaloz@kernel.org> <25f5cbed-9126-4870-a81e-65099155bc9d@kernel.org> <20261028101719.11918-1-kaloz@kernel.org> <4fba060e-c4f4-4d73-8efe-dbed0b5a7bc3@gaisler.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: <4fba060e-c4f4-4d73-8efe-dbed0b5a7bc3@gaisler.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 80CA38000E X-Stat-Signature: ou7ow5gahu3szsmtmdg1gcz9i3gj4zu8 X-Rspamd-Server: rspam04 X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1793195963-657178 X-HE-Meta: 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 T/QwVd4S 01Pof2S6pF4WFOcAcfsCaZzgCyTln+0G8DGa5N7xEBflIUe0UKtFmzq2pqd43ALG8p4KI7iYrxt0W6XEWUfOCVVNcfduAaytGltKcd76lCdbEbXQfLM2268lfHKZ08D0gYaC2QlYVpVh6V8IcfbQHvRjhR93bSrCsY+AjJ7xSa0QglKyV3lHfa48QkhHWOwBFpA5OOh0ayMSx733lUBknuiga/bcedOFNoYXj2fQ1XLTpBR/JUwUdNDagCKuFPqRJljNYqf8Iu5/kFF5NXy7gYFrfw6VJS3nLWyAkH5nt8r4WZuP8lP/2pRTzhA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/28/26 14:57, Andreas Larsson wrote: > On 2026-10-28 11:17, Imre Kaloz wrote: >>> The biggest problem all of us with supporting old hardware is the maintanance >>> cost. Not just core-mm, but also things like ad-hoc page table walkers you are >>> adding we (from core-mm) might have to touch at some point. >>> >>> If there is no good reason for the complexity, out it goes. >>> >>> Because otherwise people will push more and more for removing legacy support >>> completely, and that's not what you want, right? >> >> Definitely not. Fair point, I was only looking at it from the sparc >> side, and keeping these platforms cheap to carry matters more than a >> few percent on reclaim. B it is, then; it's below the scissors, on top >> of 1/4-3/4. Thanks for taking the time to go through this! >> >> Andreas, if David is happy with it, would you take it in place of 4/4? > I'm open to a solution like that, but it'll have to wait for the next > round as we are far too far into the merge window. Fully agreed. -- Cheers, David