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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97896E7716A for ; Sat, 14 Dec 2024 15:23:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 617EF6B007B; Sat, 14 Dec 2024 10:23:11 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5A0736B0083; Sat, 14 Dec 2024 10:23:11 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3F27E6B0085; Sat, 14 Dec 2024 10:23:11 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 1E2E66B007B for ; Sat, 14 Dec 2024 10:23:11 -0500 (EST) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 739021A2305 for ; Sat, 14 Dec 2024 15:23:10 +0000 (UTC) X-FDA: 82893932142.22.9BC7347 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf09.hostedemail.com (Postfix) with ESMTP id 76C4D14000B for ; Sat, 14 Dec 2024 15:22:49 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=PVxNFLLI; spf=pass (imf09.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1734189775; 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=WzJW0Dxa8i83uf13tdPe4mY1mNQ+O1FvKqm+giPK/c8=; b=1KNpf1/iObhS5hVFf5S+0lSvoyf1/QPT0vjrpRhyE6ljWyAV94FLjE1mnNnbjXtDmTmEZ5 ebmpREKGTfhC/hH51Z+boZJmLjzh0IdmmmtPXpQ2+7OtWv7k0eOsuriXAv+gQrSHW1XdGZ tIuuwQ5XbFv92BMnxlRo6kWMhU9kgbI= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=PVxNFLLI; spf=pass (imf09.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1734189775; a=rsa-sha256; cv=none; b=mSXGGqESJZEu0c/I58x067DrzdZ3pst2x7z0vIT+4gpZBeMn+Txo/U4pRZwviXoibAUx5J urWz5FG6Sr6VgWJ0Wpl8tA+Uncwxtkhc3BqTOEMSIUoYbh7yuMUGsEJQfQlCgDXgmxnJjK 4XkXZDvMIj/fkndTRXkVzHXDaMMBNfA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1734189787; h=from:from: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:autocrypt:autocrypt; bh=WzJW0Dxa8i83uf13tdPe4mY1mNQ+O1FvKqm+giPK/c8=; b=PVxNFLLIZ8ckeORn0BbM0TPZLvWvhCSoFEHpsg2oeJCM0mnZp+S5qC20NvJq8FSAruPqW6 /vny9JsamR3m0vJA07TTkks5E+LWM3GI9UuLrxwShP/FWK9DzJ4c2k/X5j+QJkzyFvrHQ2 COAysVGHZz9FZ8FQzIWcsl0tSnNyQ50= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-507-oeDDFxliPM-h4bIfX-oWEQ-1; Sat, 14 Dec 2024 10:23:04 -0500 X-MC-Unique: oeDDFxliPM-h4bIfX-oWEQ-1 X-Mimecast-MFC-AGG-ID: oeDDFxliPM-h4bIfX-oWEQ Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-4361b090d23so15462545e9.0 for ; Sat, 14 Dec 2024 07:23:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734189783; x=1734794583; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=WzJW0Dxa8i83uf13tdPe4mY1mNQ+O1FvKqm+giPK/c8=; b=OnbKdnu9ziz5eZtqDtjwwFv/ycVvo3lnweJpFq+3LCcqvULwvarluHeU+4mFFW32Rt Mupv8KZmQAZy+KBXIJm8//x3WzuWdEFVNhN1msjbR9VMvbjU5buPUZgCGq+jV3oTHG+F r1qSBacgcmYajnSLvQzzM21lDWW7XmRTxHLoAnhCuIvkaCj/Oc9sSWbtB1GOx1HqxPpu NGOho1Kxk23PTSB2NeWEuTlohsaP+3x6fmMlT5MsWCclsT718bxYUt+2TosKEMYJ2NAG x2x3Gx5UOjJUdHmOQX+u43gfR8R+lvdSo4lxxmtfUeC0Nkt4QQGSJczTtSobPMQqKeOs Vn2Q== X-Forwarded-Encrypted: i=1; AJvYcCVhs1gXa13NagBOkZJVTFx1OBPngePUOh4w1d+SZ0NDHqAl/HujWQX/Q4nvL4Y4eiS6oexLBX4RVw==@kvack.org X-Gm-Message-State: AOJu0Yz0pGCMErWfdtegyzuNin2GFLuEebuwUcicm+So8Nta3LvXc6ld 6qsV8T7hZ/YKIYMAr354EBrGSV1eL03AF8kscN5ekYaQ3e9C5kr+B9QgswUZKgR6AtZnFV+5fgK 7L+xEj4pSyAeb7WpzdUAUgmc7TurcrtX927FMwHUaNYUI5l15 X-Gm-Gg: ASbGncsR2LX77i3xCDcbe5eCIrwI1EOBWhwk6K+iw3cezTyXNIAvoehh32BLeFKIq/k mDMdQTalMVDVOKwXQgO6sijYKwnEiHc1zpNTp9d2+xDpi8+PKQgWTjRIgh5U0TM1gGPVj7d8H0l UddzNurusEKnzE4mWFmGn6PoWjeyN5gVXLK42Rv2yDHPuhXir5mBallvuOXXLUMjAlIurC8kq7p VUcDfDGMrOUhSMUwbFIX/roL/dxK346t3nnJ/PA0lJpbqyXpTNA4kwLBYyVb2/gce238AFCWoTo O0mIC9xWY3aKdAbBW935DyUQRhKpIg1TsPigk4G+uS8lotjbjUXydMSiVSN/TxBn6e3JRYjG0SS c9XzD4mEB X-Received: by 2002:a05:600c:1c07:b0:434:a968:89a3 with SMTP id 5b1f17b1804b1-4362aa2e544mr63037995e9.9.1734189783530; Sat, 14 Dec 2024 07:23:03 -0800 (PST) X-Google-Smtp-Source: AGHT+IFroEMk6tFJ9Cy5+aMYXPulXjntj5yFN5KYCR5CVhsKcoZETtTRpp5EY+z8zXmRnRx7Xb1Kzg== X-Received: by 2002:a05:600c:1c07:b0:434:a968:89a3 with SMTP id 5b1f17b1804b1-4362aa2e544mr63037545e9.9.1734189783051; Sat, 14 Dec 2024 07:23:03 -0800 (PST) Received: from ?IPV6:2003:cb:c711:6400:d1b9:21c5:b517:5f4e? (p200300cbc7116400d1b921c5b5175f4e.dip0.t-ipconnect.de. [2003:cb:c711:6400:d1b9:21c5:b517:5f4e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43625550518sm82347835e9.5.2024.12.14.07.22.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 14 Dec 2024 07:23:01 -0800 (PST) Message-ID: <45555f72-e82a-4196-94af-22d05d6ac947@redhat.com> Date: Sat, 14 Dec 2024 16:22:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/25] fs/dax: Fix ZONE_DEVICE page reference counts To: Dan Williams , Alistair Popple , linux-mm@kvack.org Cc: lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com, akpm@linux-foundation.org, sfr@canb.auug.org.au References: <675ce1e5a3d68_fad0294d0@dwillia2-xfh.jf.intel.com.notmuch> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <675ce1e5a3d68_fad0294d0@dwillia2-xfh.jf.intel.com.notmuch> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: gTEV7ANmc9f-bweL6Jks1erbsweqoVlehOC2FKorpvY_1734189783 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 76C4D14000B X-Stat-Signature: bdjmpbkgd8qqdifj1uqf3dups47qd69g X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1734189769-802108 X-HE-Meta: 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 EqDXKWXr 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, 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 14.12.24 02:39, Dan Williams wrote: > [ add akpm and sfr for next steps ] > > Alistair Popple wrote: >> Main updates since v2: >> >> - Rename the DAX specific dax_insert_XXX functions to vmf_insert_XXX >> and have them pass the vmf struct. >> >> - Seperate out the device DAX changes. >> >> - Restore the page share mapping counting and associated warnings. >> >> - Rework truncate to require file-systems to have previously called >> dax_break_layout() to remove the address space mapping for a >> page. This found several bugs which are fixed by the first half of >> the series. The motivation for this was initially to allow the FS >> DAX page-cache mappings to hold a reference on the page. >> >> However that turned out to be a dead-end (see the comments on patch >> 21), but it found several bugs and I think overall it is an >> improvement so I have left it here. >> >> Device and FS DAX pages have always maintained their own page >> reference counts without following the normal rules for page reference >> counting. In particular pages are considered free when the refcount >> hits one rather than zero and refcounts are not added when mapping the >> page. >> >> Tracking this requires special PTE bits (PTE_DEVMAP) and a secondary >> mechanism for allowing GUP to hold references on the page (see >> get_dev_pagemap). However there doesn't seem to be any reason why FS >> DAX pages need their own reference counting scheme. >> >> By treating the refcounts on these pages the same way as normal pages >> we can remove a lot of special checks. In particular pXd_trans_huge() >> becomes the same as pXd_leaf(), although I haven't made that change >> here. It also frees up a valuable SW define PTE bit on architectures >> that have devmap PTE bits defined. >> >> It also almost certainly allows further clean-up of the devmap managed >> functions, but I have left that as a future improvment. It also >> enables support for compound ZONE_DEVICE pages which is one of my >> primary motivators for doing this work. > > So this is feeling ready for -next exposure, and ideally merged for v6.14. I > see the comments from John and Bjorn and that you were going to respin for > that, but if it's just those details things they can probably be handled > incrementally. > > Alistair, are you ready for this to hit -next? > > As for which tree... > > Andrew, we could take this through -mm, but my first instinct would be to try > to take it through nvdimm.git mainly to offload any conflict wrangling work and > small fixups which are likely to be an ongoing trickle. > > However, I am not going to put up much of a fight if others prefer this go > through -mm. > > Thoughts? I'm in the process of preparing v2 of [1] that will result in conflicts with this series in the rmap code (in particular [PATCH v3 14/25] huge_memory: Allow mappings of PUD sized pages). I'll be away for 2 weeks over Christmas, but I assume I'll manage to post v2 shortly. Which reminds me that I still have to take a closer look at some things in this series :) Especially also #14 regarding accounting. I wonder if we could split out the rmap changes in #14, and have that patch simply in two trees? No idea. [1] https://lore.kernel.org/all/20240829165627.2256514-1-david@redhat.com/T/#u -- Cheers, David / dhildenb