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 D4A86CA5FA2 for ; Mon, 28 Sep 2026 12:44:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C21336B0088; Mon, 28 Sep 2026 08:44:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BD1836B008A; Mon, 28 Sep 2026 08:44:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AC0676B008C; Mon, 28 Sep 2026 08:44:46 -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 7FFD66B0088 for ; Mon, 28 Sep 2026 08:44:46 -0400 (EDT) Received: from smtpin05.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 1608DC01BE for ; Mon, 28 Sep 2026 12:44:46 +0000 (UTC) X-FDA: 85263140172.05.E5CEE07 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf19.hostedemail.com (Postfix) with ESMTP id 3B2051A000B for ; Mon, 28 Sep 2026 12:44:44 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=SzG5j3GA; spf=pass (imf19.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=1790599484; 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=JZo2AMqW6bb34y5z594VrLXKq20u+UKoMHD5xT8vo4s=; b=u+jv3Inr2Vd2Pa3Rogt9ATwmIs77xVrfFs7LC7iR15YWYevi5rU543se5CMhmCbUHqTl50 kJuy5+KaUbeDRmmRF1k+kBt/HxIZ1mTkszMwmngWUYtKRp78YCy/npJf8lJ4cXTLG0LHGU Cw85uylw4V4OYCoFLacwV7o/1z2qr3s= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=SzG5j3GA; spf=pass (imf19.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=1790599484; b=rF1kXXeQD4PmlcYJ8T58rrQCfM2Tci29kZdSjRQD1lzZL2V3WElVVJOAGC5AE1BQTbjvNl cx2qUuBuke2I2otiCFg5exbF+4hAD6J2+Oiek4iGTQ0K3cvHLy8uX8XPCs3ZZId8RX6wNA xSVspXopIbJXzftRPb68eq6aAJ4jTdg= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 5897E43FEB; Mon, 28 Sep 2026 12:44:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7CAF71F000FF; Mon, 28 Sep 2026 12:44:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790599483; bh=JZo2AMqW6bb34y5z594VrLXKq20u+UKoMHD5xT8vo4s=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=SzG5j3GAsaLpl1Ye6fKOp9yIOCabQQBJFvzTvELAV3SaTU+j4D4qIExCiYuzY2I+u hp5nXm+u8GUW/jN7ksy2K0fk+UUAZL/u+MbwYjid9ntbZFN8TIk4zajHZNf+ADaGmJ 45/Kz6LZvU89GpqMaAyk0eWOZSGK4df07O5AQ5jPEVMLRhlG3bYJYCuWdBv+nT9YIN m6RE2n1e1xi+8QZYxVjL3DWvLY2gpqLH8Ig0RkdcnQu2Eq/jM2JiQs3Sg3Sl2U0J81 0zOcvnH8W74eJy8nCWPRCCGNK1sC9aOjVQ1i1R3l7X3/aQ7caz86/gTEgVfMiJ6K8i 6Ws7iqKGL9Mmw== Message-ID: <607759bf-59f2-4ad6-b95b-e780ed2acba3@kernel.org> Date: Mon, 28 Sep 2026 14:44:34 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/6] mm: Unify device DAX and HugeTLB vmemmap population paths To: Muchun Song , Madhavan Srinivasan , Mike Rapoport , Andrew Morton Cc: Michael Ellerman , Nicholas Piggin , Christophe Leroy , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Qi Zheng , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev References: <20260924075259.2013039-1-songmuchun@bytedance.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: <20260924075259.2013039-1-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3B2051A000B X-Stat-Signature: fxd6jod4figwrtjwxs3unr9oyniocrd9 X-Rspam-User: X-HE-Tag: 1790599484-564989 X-HE-Meta: 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 2EkpNQ3w iwFfryOgMg55g1VkqQR1df1iYVOnRNAy4PC+8yZ4EEd/EcRDoJcHSOJnn/84HnaUnrVitSlNTq98+mrUmlmxQCGFyCNmVpF56Rbn1y1YhQIImtehoEGJaJl1x6Ucd9zB/Yg8273B5bDib4r4BljJ8WBl4VSmLuww/cZ8vqIDgZTCQDs+wkQ4iw4iXN6xTbKCUEOMfRSAyfzcTZtHC9UvlhhE5vdZYITbcgUEc2EAbGrwrZRwhEomjVoUxhIgohwtIgzPK2VVmq/2jDeeZUNE2McqKXuF1MkNzmoigDmXwhvwzWanRmUGor45Z2Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/24/26 09:52, Muchun Song wrote: > This series is split out from the earlier, larger series "mm: Generalize > HVO for HugeTLB and device DAX" [1]. While the parent series generalizes > vmemmap optimization across HugeTLB and device DAX, this subset addresses > a single, self-contained step: unifying their vmemmap population paths. > > After the preceding Device DAX conversion, both HugeTLB and Device DAX > describe optimized vmemmap mappings through memory-section metadata and > use per-zone shared tail vmemmap pages. The generic code, however, still > carries a Device DAX-specific population flag and compound-page population > path, along with arguments and helpers needed only by that path. > > This series first removes VMEMMAP_POPULATE_DAX and moves selection and > reference handling for the shared tail page into the common vmemmap > population path. It then removes the generic Device DAX-specific > compound-page population path and routes section vmemmap population > through vmemmap_populate(). The powerpc radix path continues to use its > architecture-specific compound-page population implementation for > optimizable sections. > > The remaining patches remove the unused ptpfn argument, open-code > vmemmap_populate_address() now that no caller needs its returned PTE, and > add a warning for inconsistent zone initialization of shared tail vmemmap > pages. > > This is the fourth smaller step toward the broader HVO generalization. > After this series, HugeTLB and Device DAX use the same population model > instead of parallel generic paths, while powerpc keeps its > architecture-specific implementation. > > [1] https://lore.kernel.org/all/20260513130542.35604-1-songmuchun@bytedance.com/ How does this series relate to https://lore.kernel.org/r/20260927025441.741633-1-songmuchun@bytedance.com ? -- Cheers, David