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 1B44EFB44C4 for ; Fri, 24 Apr 2026 07:28:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 825D86B008A; Fri, 24 Apr 2026 03:28:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7D6696B008C; Fri, 24 Apr 2026 03:28:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6C6246B0092; Fri, 24 Apr 2026 03:28:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 5CF3D6B008A for ; Fri, 24 Apr 2026 03:28:53 -0400 (EDT) Received: from smtpin06.hostedemail.com (lb01b-stub [10.200.18.250]) by unirelay03.hostedemail.com (Postfix) with ESMTP id BE203A0769 for ; Fri, 24 Apr 2026 07:28:52 +0000 (UTC) X-FDA: 84692622504.06.ACE57D4 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf17.hostedemail.com (Postfix) with ESMTP id E654E40007 for ; Fri, 24 Apr 2026 07:28:50 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=s3cWFCHb; spf=pass (imf17.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-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1777015731; 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=9J5YHddFzzYnJDgh4WXjnm+KmA+EDV2qWWdAasFJsys=; b=ok3x5Oz36sy2l7jWuE/gH3082Z5bDUpvRbgNqrCFBFo6WfLOHm0fdJrUf0AftjAdCNQdTk srFqCOlca5Ebstah2CaREjk2KoquzslYN5+FEEF87EIggEn03CDrtVHo6Vu3xM3fzXtxlx dl55W3ga50zeNY266aWFBTfHMzBItXg= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777015731; a=rsa-sha256; cv=none; b=igCUCOftmsHwG4XOiDavIUBg9Dea4dIKG+6Huxx31NCAQurCa/UaZbRluZ8RGi40RBWn82 vUSAwtd5mNJ+vpPhfepszrcmvoQeg8NcYGGWld1ZWtpjzNdVYRH9416EMvPn7YKg1o5/tb rjM3+0jncKubGyDKqcKJlXSGVoTnIZ4= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=s3cWFCHb; spf=pass (imf17.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 (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B0AA540A66; Fri, 24 Apr 2026 07:28:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 449D1C19425; Fri, 24 Apr 2026 07:28:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777015729; bh=D5WTkAG67DCeRIXXL7QTaoWz4jtq3LR9v34sTXeVWX8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=s3cWFCHbvARap4MiTOiZhdctXelw9CweptCYFnW+h/atSINq5YTY3xRoxZwJKlbTM A6tmoD4Qb+0YU4vYTzSFsqwfLtKy1AQIF19Zgt+4qLLHblg4j/MdJrY4OyBkQmzgl+ C/HUcHHz725Z4v7OIdL1eSqmQ9VtLWoMWOj44AgdQj85j+Hi2gGiWtkkkJx9Cnz3uM Go8Jk7fc+gcSdR53WBvrvLND0M9EA0NYDystm2T0ulfYZttqGKi8MgXFa4Ce6AQPeX 2+piW6vCAARfbJ3PWJ8j4iXltKDT3qy+JFzCWsvynZX/7r16t8jYNrc1qaGxQxe9sy kMBAp8IQ2hOww== Message-ID: <016cc5e5-044c-46c6-a668-200f90a64d85@kernel.org> Date: Fri, 24 Apr 2026 09:28:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v3 01/19] mm: thread user_addr through page allocator for cache-friendly zeroing To: Gregory Price Cc: "Michael S. Tsirkin" , linux-kernel@vger.kernel.org, Andrew Morton , Vlastimil Babka , Brendan Jackman , Michal Hocko , Suren Baghdasaryan , Jason Wang , Andrea Arcangeli , linux-mm@kvack.org, virtualization@lists.linux.dev, Johannes Weiner , Zi Yan , Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport , "Matthew Wilcox (Oracle)" , Muchun Song , Oscar Salvador , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Ying Huang , Alistair Popple , Hugh Dickins , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , linux-fsdevel@vger.kernel.org References: <9dd9deabd42801f3c344326991d1431c3d8db39d.1776808210.git.mst@redhat.com> <20260422171315-mutt-send-email-mst@kernel.org> <20260423074433-mutt-send-email-mst@kernel.org> <88b0765f-7cfc-4e44-83d2-c01a1755c842@kernel.org> 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-Stat-Signature: ftxdnsth58mkanxzq7yoe718ts4dn48k X-Rspam-User: X-Rspamd-Queue-Id: E654E40007 X-Rspamd-Server: rspam05 X-HE-Tag: 1777015730-794547 X-HE-Meta: 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 XAknavgP RMa9VBswDOaxJvpesgIAMfx59EzYg/CY+WQEazTolrddCKTepvxHeAk6oU4tDOVZ6q+MtNmKM3AtDLTu3HQIVviJZ0EMOmLd4HEdP3tpSKGUWhQx6moSeLF+5aNiu5IveIkSYlVrrOUOTIIROJURQEq9sjpXBv7qfdCcGQSL5VIFKoUAU+fx6woc1R9Mc3pIXf4iwXnheYuNuUSn03mO8+og+R/XtgsNsKIG9JbT63sjc3+RdmrRXEgXv2cxg4Ko4ZbHzVNqb1a55i2erU1V8vdGJUsrTW1O39vwcEplfMgA/K98wtSQyt2f6yPSTp7QvQiLd0TGq2IQm2tf8hNKH+QvZa/sxVQWnGKHJ5GQyGDuFPGeS/L2W1hLUCczDNfcnhYk0 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/23/26 16:57, Gregory Price wrote: > On Thu, Apr 23, 2026 at 04:13:50PM +0200, David Hildenbrand (Arm) wrote: >> On 4/23/26 15:42, Gregory Price wrote: >> >> Maybe we could forward the vma+addr here and call a vma_alloc_froze_folio() if >> we have a VMA+addr to have a clean interface. >> >> But really, that hugetlb code is rather messy. I'd vote for leaving hugetlb >> alone on a v1, and focusing on non-hugetlb first. >> > > If we're ok increasing the buddy surface this way, then I'd vote for > only updating the exact interfaces that MST needs to update for his use > case in a base set of patches, and then have each additional updated > location (or logical set of locations) updated in follow-ups. > > My initial go around with this - the patch was hard to read at best. > > But I also think we should also seriously consider not increasing the > surface of the buddy. Exactly, that's why I am saying that vma_alloc_folio() is the only external interface people should be using with a user address. all other _noprof helpers are supposed to be internal. For hugetlb, we might need another interface for frozen folios later, which is why I suggest to defer that. -- Cheers, David