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 88B0DC4167B for ; Mon, 11 Dec 2023 16:35:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 079A36B0121; Mon, 11 Dec 2023 11:35:51 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 027BB6B0150; Mon, 11 Dec 2023 11:35:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E0B5B6B0176; Mon, 11 Dec 2023 11:35:50 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id CA6F76B010D for ; Mon, 11 Dec 2023 11:35:50 -0500 (EST) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 70859140833 for ; Mon, 11 Dec 2023 16:35:50 +0000 (UTC) X-FDA: 81555088860.02.E88A716 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf12.hostedemail.com (Postfix) with ESMTP id 3211140023 for ; Mon, 11 Dec 2023 16:35:48 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=WdyiiIjU; spf=pass (imf12.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=1702312548; a=rsa-sha256; cv=none; b=ISL59aw8cc3Tl/fSykZ8QYKYu+krJAWhGjFI6SLgXKsbTk5Jwd5CBu8SYyUIM2ZFHvhzkl zQtdLiJMK+7ZT1GZ2aRmE3B4MauUeC3iaBkOI0CG0atukbuNHO1d0JAYmtWSCbxGdHSLEF vax3Kif503maF7zsmfcuAzOBDSRc5XM= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=WdyiiIjU; spf=pass (imf12.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=1702312548; 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=CJNLvfM2+sDAhtWtWSLZKEEHZZTVIXo/koGlz70aoJA=; b=vQh/YmPOXFstc3Qmswo1Q1ZoFaEv6fLh97kBUfjQ3Dx+3FrzfXTe7CYaMWWPzZHGy0oPO0 itZvVRywVM//tTTZu0XBpOiibizjLg7akHLF23gDk1tqnPcHmYcvZIR4pY9D3edWDSXLzG vuby4J4ZF5fyWPP3czawww1m7cen/Js= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1702312547; 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=CJNLvfM2+sDAhtWtWSLZKEEHZZTVIXo/koGlz70aoJA=; b=WdyiiIjUC/6NiLW9uyhp9dRL4N+KcB8wBqwsX1bkgmqiAMYrr4Dc9cDb6mi1UjalCv+yXw EQ9Uv9hHDazVt88c4rxyxEeIPUG9NiUS/C36n/QLRbffvbEz3xuMSQ6zga8zdftPNUtJJz hW4VKTnoilfDY6XftI8w/7snaLT7oz8= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-533-gB8Ap3lFNIK5vmxQxNZxzA-1; Mon, 11 Dec 2023 11:35:45 -0500 X-MC-Unique: gB8Ap3lFNIK5vmxQxNZxzA-1 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-33340d20b90so4095084f8f.2 for ; Mon, 11 Dec 2023 08:35:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702312545; x=1702917345; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :references:cc:to:content-language:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=CJNLvfM2+sDAhtWtWSLZKEEHZZTVIXo/koGlz70aoJA=; b=sZH816tXAbpiAKvFuZNLo/DclBuJwhzi6ZA/Ra7nXkUuIAEbynU3NQMGHEuJWcey3Y fIEEHoRugpZfODI56kO/AbUD3zvxxrOzqEcVZlKO8KpgFDLyCkAiRIVzvhD3BQ9Dx0Ge R8xbxIQ/Baa64P75iyDh3703Gz/Hk0vTTurgr6zmMjgmEWKpdGpP+8DBCKEz5tgLUR3F CdlyPr0MnZ4QhvL8RsqVt9hUPMtZTjLImOczx3LIl/aM3G5oTIUCnGiM8M3/mn0hZjC1 aL0oOS0UUgdKjDhhIy6eM5cWYj5UNTm6tfMc4IoxZ4dKosI93KC1gpXQTJeE1Uew5aHL StgA== X-Gm-Message-State: AOJu0Yxo387vkQIDpEs16N8vBvjIC2bqjBisA9wJiVQVdz8o8lTVcT2p T0Q/BOKvgP6SP6h9CF9kCQbQAyTlAw3pSwJEs6SYeiHm5d/uJMLJyH6naXZny0FUFEIjrYm32R3 0xf29pZtT+GU= X-Received: by 2002:a05:600c:1ca7:b0:40c:3548:1ee9 with SMTP id k39-20020a05600c1ca700b0040c35481ee9mr2210704wms.164.1702312544768; Mon, 11 Dec 2023 08:35:44 -0800 (PST) X-Google-Smtp-Source: AGHT+IGSu8LMQMyz10AqPy+OD7tQjIn+2fu2jth+qRBYVSNjxt4c31O/ASrWWAwBdpX3Jke3U8VNPQ== X-Received: by 2002:a05:600c:1ca7:b0:40c:3548:1ee9 with SMTP id k39-20020a05600c1ca700b0040c35481ee9mr2210695wms.164.1702312544417; Mon, 11 Dec 2023 08:35:44 -0800 (PST) Received: from ?IPV6:2003:cb:c742:ae00:6e5f:7195:98f6:3ed1? (p200300cbc742ae006e5f719598f63ed1.dip0.t-ipconnect.de. [2003:cb:c742:ae00:6e5f:7195:98f6:3ed1]) by smtp.gmail.com with ESMTPSA id m27-20020a05600c3b1b00b0040b38292253sm15751231wms.30.2023.12.11.08.35.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Dec 2023 08:35:44 -0800 (PST) Message-ID: Date: Mon, 11 Dec 2023 17:35:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 02/39] mm/rmap: introduce and use hugetlb_remove_rmap() To: Matthew Wilcox Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Hugh Dickins , Ryan Roberts , Yin Fengwei , Mike Kravetz , Muchun Song , Peter Xu References: <20231211155652.131054-1-david@redhat.com> <20231211155652.131054-3-david@redhat.com> 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: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 3211140023 X-Stat-Signature: 8cf687t5ded76d1qfz3t7saeesh7fmpx X-Rspam-User: X-HE-Tag: 1702312548-445447 X-HE-Meta: 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 uVBZ/SRk 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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 11.12.23 17:33, Matthew Wilcox wrote: > On Mon, Dec 11, 2023 at 04:56:15PM +0100, David Hildenbrand wrote: >> hugetlb rmap handling differs quite a lot from "ordinary" rmap code. >> For example, hugetlb currently only supports entire mappings, and treats >> any mapping as mapped using a single "logical PTE". Let's move it out >> of the way so we can overhaul our "ordinary" rmap. >> implementation/interface. >> >> Let's introduce and use hugetlb_remove_rmap() and remove the hugetlb >> code from page_remove_rmap(). This effectively removes one check on the >> small-folio path as well. >> >> Note: all possible candidates that need care are page_remove_rmap() that >> pass compound=true. >> >> Reviewed-by: Yin Fengwei >> Signed-off-by: David Hildenbrand > > Reviewed-by: Matthew Wilcox (Oracle) > >> +++ b/mm/rmap.c >> @@ -1482,13 +1482,6 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma, >> >> VM_BUG_ON_PAGE(compound && !PageHead(page), page); >> >> - /* Hugetlb pages are not counted in NR_*MAPPED */ >> - if (unlikely(folio_test_hugetlb(folio))) { >> - /* hugetlb pages are always mapped with pmds */ >> - atomic_dec(&folio->_entire_mapcount); >> - return; >> - } > > Maybe add > VM_BUG_ON_FOLIO(folio_test_hugetlb(folio), folio); > A bulk-add that in patch #6. Thanks! -- Cheers, David / dhildenb