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 08792E77180 for ; Tue, 10 Dec 2024 20:12:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 883B06B016A; Tue, 10 Dec 2024 15:12:17 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 80C816B016C; Tue, 10 Dec 2024 15:12:17 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6383E6B0170; Tue, 10 Dec 2024 15:12:17 -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 3E2AB6B016A for ; Tue, 10 Dec 2024 15:12:17 -0500 (EST) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id B3786C0DAA for ; Tue, 10 Dec 2024 20:12:16 +0000 (UTC) X-FDA: 82880145768.05.F4D1CC6 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf10.hostedemail.com (Postfix) with ESMTP id 8B168C0018 for ; Tue, 10 Dec 2024 20:12:04 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=f+GO3kgp; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf10.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1733861523; a=rsa-sha256; cv=none; b=yexcgF3ncAhb4V9nrthS5MHpHDf9hsmMCoxWkZaKmrDiVn6mqFOm4qoE6iAxkv91AkdAFA D1CcMGv93X1bu5YpJUYMolN6eLgdM7UXe3uqJBs5yoVD44N3wtE55lctX56xs6dswsts2e DsBhF+bAWnOIwgGsV1SWeiywCGqlS0A= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=f+GO3kgp; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf10.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1733861523; 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=juGHJy98WZH6LpUInCfGRhQO53ofgyYN4j3qIV+zEL4=; b=AY3McrJC806bCkqV0k6wc7mIDkIGSpJGRwRRaNE1wo6I3w/5cGKR9SG8cUHc8+U5FeDM/w YvRVUbdsVFL2mt8zxnhdn+u8vR1zXbHzSliH5Y8CvckNP6/+Af3ITfUtugO/rF5kl1OgDe 6Bzy0ESNVrzuvu5K7HfnxEdIKCm1tXU= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1733861533; 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=juGHJy98WZH6LpUInCfGRhQO53ofgyYN4j3qIV+zEL4=; b=f+GO3kgpXubMaPWfYmOnIoHvHrQHZMXcL99+z7CuF+9dB0NsLsIZgUzY+xYAxKKLWpbPio mqYcF9y4E2VUqjIU1CdmHIpAVEN5iC1f98AkUbW5I4dEj39VMGRcp8Kv+n11ZzABQbStUU 7h3UVJHEY0W6p6+SLtThS0rEsFg20+w= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-56-cXlZzOL7MB6QVJn5mNFBKg-1; Tue, 10 Dec 2024 15:12:12 -0500 X-MC-Unique: cXlZzOL7MB6QVJn5mNFBKg-1 X-Mimecast-MFC-AGG-ID: cXlZzOL7MB6QVJn5mNFBKg Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-434edbbc3a7so25098065e9.3 for ; Tue, 10 Dec 2024 12:12:12 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733861531; x=1734466331; 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=juGHJy98WZH6LpUInCfGRhQO53ofgyYN4j3qIV+zEL4=; b=FTwYZES/qasgEUyNA3OVmesCAa0IuC77T01zK2n+gBtRlzzEfz+XVKkEIf4hfUPVnJ taoIkX1rL6a8Nx01fCzM9FzXH6G/LEG3OZb+AWQ2GtcfGc1woISRsBcYYnplkGutCR4l 2rl5MMZ/UW7zbJoxp6DYhwXzWBs2tAgMAxq61GgP9weqLcMx5QInYQU1UeW/hji5Up// DDdaz6KG0GyNCMsiV9ExHDEFMZCVfPvhQXrQX+5WRdRIfDrH2n40NF+mng2ItkMC5gG6 vhEqX3VW1obkKsNyTZkrAv43lU9Au4rDq1+iYNFZ24dei3znB4gKAJwsf3oKKIDQngyY GRew== X-Forwarded-Encrypted: i=1; AJvYcCVR5yBakzXSrx66dMr6uSiThh/Waqnt166sJhn57A8e1Mso5jJk6QczzUXl8blT+RCY6HywfV0PuA==@kvack.org X-Gm-Message-State: AOJu0YyYR154jt8x0JJh6jqSwLYhGr/swofDUCNo2HKbz9M/Lqv0vGfC faflBGaMIMkJ6ZD8RbJKKpCPJtFPb0UuUS+qvgHfSZP7wOjqECAvAm3E2kgflAX5qHb2RX9Uq0Z h1aSO4f2Lhi+yB1s9ndFQGtcPlJuT4iPVt6Oz+ZJVF5rqjAw5 X-Gm-Gg: ASbGnctcHgA+SkKCYUN84gVGhvF4MVVsDveX1tgGrUgpU9L4N1XvhwkOIVY/H96fb9p yMDMTvKu2A4PrB4rVXbul3P6EJ4iwMWrdoowHuc8iWRHXggQ9w4HjGnRjvnCLhlNTCgKQOJkPYx HYAdhrsedWJXp2kjYjljcCDjEj8vLLI84TlF+lp31b4tPZfpasbA5X8iS9N5RerwCJTLG1JJbde A1rtlnX3TGH6r8T2PSCHa1c004SjJQqMcFdJy6l/+95fJv9mI9lUUli658mLIaDRsfQhA1UfITR myJ3VP9YFO5Z6jdlsXHIHnMNHh7XQSbD8lYxV9cUno5zX4TILiuMpXS29rtD3E0XGwHBAjgG8gK Nx26R1w== X-Received: by 2002:a05:600c:5122:b0:434:a5bc:70fc with SMTP id 5b1f17b1804b1-4361c393889mr1225445e9.8.1733861531102; Tue, 10 Dec 2024 12:12:11 -0800 (PST) X-Google-Smtp-Source: AGHT+IHBXk0gQ+aT/mZKbFBNcqLPO6kHx7wUGVXlbh1qFlhCc8nVpAeKsJp4y+2W20lwaMMn0P35ig== X-Received: by 2002:a05:600c:5122:b0:434:a5bc:70fc with SMTP id 5b1f17b1804b1-4361c393889mr1225195e9.8.1733861530742; Tue, 10 Dec 2024 12:12:10 -0800 (PST) Received: from ?IPV6:2003:cb:c723:b800:9a60:4b46:49f9:87f3? (p200300cbc723b8009a604b4649f987f3.dip0.t-ipconnect.de. [2003:cb:c723:b800:9a60:4b46:49f9:87f3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434faeda409sm70709485e9.7.2024.12.10.12.12.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Dec 2024 12:12:09 -0800 (PST) Message-ID: Date: Tue, 10 Dec 2024 21:12:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RESEND v3 6/9] mm/truncate: use folio_split() for truncate operation. To: Zi Yan , linux-mm@kvack.org, "Kirill A . Shutemov" , "Matthew Wilcox (Oracle)" Cc: Ryan Roberts , Hugh Dickins , Yang Shi , Miaohe Lin , Kefeng Wang , Yu Zhao , John Hubbard , linux-kernel@vger.kernel.org References: <20241205001839.2582020-1-ziy@nvidia.com> <20241205001839.2582020-7-ziy@nvidia.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: <20241205001839.2582020-7-ziy@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: zFmgpd8RP_6ORj9Ij0qqSO8xLDdKpjMsY0yyPA7P2C0_1733861531 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8B168C0018 X-Stat-Signature: 4btwus5ziii46rg5mxb7dop78z9xddtr X-HE-Tag: 1733861524-377342 X-HE-Meta: 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 q80Af3mw ua0jx/d8WO2gA+PLsuxBoqrVgfIN69R9AmLI8SZR2/XAEHhSJBRyj7/l3CNEKkvDcR11eHT1hZkemXoDE2qzBQclH/pjhRb1odHqPtJldIVb1ECzyTWe65vhPHzkupBpAvRQbpCLPWAV0zhC7NZf/mR3Kw1Jhsyt1vbc9Bg7CtfD8Xi/77/Y5CRRccC4wD03ZhddAHPVq6cscBJoTUym3mMoJ82mYFDISMrjFB+8ULEtCzLzPg8hzOZ5szuwrV7UJgTnCeeNKKgBVcZ/raNIY5FBXjkgCeh+6BTHF5+TXt5kkPh4cMkEb9ADC/FUSfsiB6gXhu9mZi7PwzHPUy1aKI27Du1AtOUnRHAClXn7cETRWd+MjsljXQ//fEZI4oZH0Ao4M1DGe5SJ6qRnx2/QaVW6bkXSuTogi412yxN8sTsWIGP1FEY/246KhHdO2fMviflOn X-Bogosity: Ham, tests=bogofilter, spamicity=0.026449, 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 05.12.24 01:18, Zi Yan wrote: > Instead of splitting the large folio uniformly during truncation, use > buddy allocator like split at the start of truncation range to minimize > the number of resulting folios. > > For example, to truncate a order-4 folio > [0, 1, 2, 3, 4, 5, ..., 15] > between [3, 10] (inclusive), folio_split() splits the folio to > [0,1], [2], [3], [4..7], [8..15] and [3], [4..7] can be dropped and > [8..15] is kept with zeros in [8..10]. But isn't that making things worse that they are today? Imagine fallocate() on a shmem file where we won't be freeing memory? -- Cheers, David / dhildenb