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 C64C1D591A5 for ; Tue, 19 Nov 2024 16:25:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5A34A6B0098; Tue, 19 Nov 2024 11:25:41 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 552AB6B009E; Tue, 19 Nov 2024 11:25:41 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3CBC66B009F; Tue, 19 Nov 2024 11:25:41 -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 1F2816B0098 for ; Tue, 19 Nov 2024 11:25:41 -0500 (EST) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id C38EA1A0624 for ; Tue, 19 Nov 2024 16:25:40 +0000 (UTC) X-FDA: 82803366912.17.5E989E8 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf19.hostedemail.com (Postfix) with ESMTP id 234AD1A000C for ; Tue, 19 Nov 2024 16:24:34 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UrC36EdI; spf=pass (imf19.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 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=1732033357; 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=P+AkfYwNh3Vl39zkgnP+r7LIfANV0I766VFzfH39QZ0=; b=WiPtCYNL3/7FWIC0ygypEbaeaspXCxdEpGlhuewKX2kyXgIKeBw5a9oEgdztrdMMp/0thu 7ShGtNdqyAUd0LVNba8cFEPQuuMcVVZI+cC5Bh0SGBGxgDw2cbx8ismAohtS3ATYHokAP8 8TB4trJ2UjR3uutpbl+nS85kejJu/Qc= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UrC36EdI; spf=pass (imf19.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 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=1732033357; a=rsa-sha256; cv=none; b=fp+TDT6pIFHUgWe4OaFUMe/2TZ/8O1Z2IAaZmGKLRLuvQNrIWIQZEnNn1yP5tUmQmBzuly AhCXQlzrBZSCvjZX5THR8z4ojPfy+3UnCFV7jp9wXKdpf3QxY//+rig+AWzhCJXoHk/V3L pdlCVckbnI4pQPXEW3zBqBHia6Gajb0= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732033537; 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=P+AkfYwNh3Vl39zkgnP+r7LIfANV0I766VFzfH39QZ0=; b=UrC36EdI4Au928KYOb/SYoVnledtl0OGZqTLqpqCLFBnRXSxl6t65YD/AuCN2ELa4iro+d 1w+dm0o9/wf2J++T60tf8ZY5Vzri0jeos1jCLTDTq+JSlJs1oswgii8JJMaXIHuEf47W0+ lzyqdi0hj/ojkAYBRIgaaLRPzRlP9/U= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-448-Jd2LN3-BPMGrJYpOd8U7Tw-1; Tue, 19 Nov 2024 11:25:36 -0500 X-MC-Unique: Jd2LN3-BPMGrJYpOd8U7Tw-1 X-Mimecast-MFC-AGG-ID: Jd2LN3-BPMGrJYpOd8U7Tw Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-38231e6b4cbso2817416f8f.3 for ; Tue, 19 Nov 2024 08:25:36 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732033535; x=1732638335; 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=P+AkfYwNh3Vl39zkgnP+r7LIfANV0I766VFzfH39QZ0=; b=HEDK7lOE428uEKDJuzWncJ4F4TCQxAbYT+pt1W8ybfCFs4oDKYi69OTc/Wkqhi5DM9 Q5ToYZh1dnJpk4+sqzQcydv6wuzA0EV1BL6ULqTaydnj+1LaPWCFjuYdeFCevj/vyY3K aJyzGyzVN+yKDkb7SepT8p4wwxn8HnMZUYmTkuQcHU0thDS183ZOb4uFHGpCnYbiDxJ7 F76KQi7ARjPUQWNKTzChV+eLwHnj6praVn28xFPj+gRGmfD7XH4EXXSN6Z1IX0DGl2ew 9wMGojM/KNKUUhlmaS8jowrj2IW4+tXP7UXA3l7DWxWI2m5jb5w2nZu/G8b8DvlsnZ80 uYRQ== X-Forwarded-Encrypted: i=1; AJvYcCU7NYETbCPSRsVgUfxgkCgKEUT1qVAUqx5DPywO8T47TfK4z4zrYjb6VPkUHS4XYcwvgQbT3APIkQ==@kvack.org X-Gm-Message-State: AOJu0YzMwIiDBL+T9XSHGnANadbugsS47g81YP4of19Ld7W58DbmpPxw poFEFJUnskmhiPvEP/yMYnw62GB69mVkiquhj4lS4ePTiixO7/JEzRxwh19CBYEkzlVoHU+bFAx l+3Wlo02zS3E//dlRivwZVBAkqOqFnpKbIZYmfwLlDu0O2keT X-Received: by 2002:a5d:6dad:0:b0:382:4b9a:f506 with SMTP id ffacd0b85a97d-3824b9af736mr5282634f8f.36.1732033535263; Tue, 19 Nov 2024 08:25:35 -0800 (PST) X-Google-Smtp-Source: AGHT+IGPE4jBqw/WUv0UEB08s5MCg97nejnEDkSvYi5mqV0YHsob1jqWZHauBQ9Y1+EhNRMs7128zA== X-Received: by 2002:a5d:6dad:0:b0:382:4b9a:f506 with SMTP id ffacd0b85a97d-3824b9af736mr5282602f8f.36.1732033534894; Tue, 19 Nov 2024 08:25:34 -0800 (PST) Received: from ?IPV6:2003:cb:c74b:d000:3a9:de5c:9ae6:ccb3? (p200300cbc74bd00003a9de5c9ae6ccb3.dip0.t-ipconnect.de. [2003:cb:c74b:d000:3a9:de5c:9ae6:ccb3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3821adbeb88sm16227545f8f.62.2024.11.19.08.25.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 Nov 2024 08:25:33 -0800 (PST) Message-ID: <1cc67acb-8b29-44fa-9528-c9bde5fab9a9@redhat.com> Date: Tue, 19 Nov 2024 17:25:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH mm-unstable v2 1/3] mm/contig_alloc: support __GFP_COMP To: Zi Yan Cc: Yu Zhao , Andrew Morton , Muchun Song , "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240814035451.773331-1-yuzhao@google.com> <20240814035451.773331-2-yuzhao@google.com> <402ff3e5-4fca-4452-97ba-5b1ec4a6eeb1@redhat.com> <00721702-78FF-4690-8EAA-31C367FA9FC0@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: <00721702-78FF-4690-8EAA-31C367FA9FC0@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: A0EbR8ajkJhBH0Ojg_XqNxxfwAfxpGcNNhbyRgcMkHk_1732033535 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: rspam09 X-Rspamd-Queue-Id: 234AD1A000C X-Stat-Signature: o5os1ktja8ujc87483wnh5jxqygaiyys X-Rspam-User: X-HE-Tag: 1732033474-86295 X-HE-Meta: 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 ADoWMi6n vMBSjK/eDCmv120E7VbuozK3QNyq9HmrX4Gbvf5R/VG/aSIzK6Fj87+jQJ/AlAM0UXE8zRDKqMrjmGf9ev1nr1h3iGgyuK0ZdAj40ZBGE4xfIyqzynl+mJ2lXHS6Ku5UztLlJ75AlQFyVgtyXOmaH0hjGCBxRqvgVKYrYl5F8XGB9SbXDIjmBnKXXJ3RQ0E+ih0WTCr+Tu/SFzrSlYuJ3V8k7HVuN2iJKKQvNKLA0uNrXREulAAh8Sxw9QbUMJvvusBtmBK+wMRABTr3oGWErRUrQp1EYLTI98jWMN/XaGYKMWNihpVk0NcltBvv3qASXQHI3CDmgXDHbvsm/Zv9JSGo4U6zsBu3TGeYZry/BrOrubsoZ24lb2GUCHEwcAZpLLbhF3Z/HUfoOutLYFGn+bq00Wp2LyyLkBX10lA3n8CpUWv8fX6mAf839HEAMO2iqc5KP X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 19.11.24 17:12, Zi Yan wrote: > On 19 Nov 2024, at 10:29, David Hildenbrand wrote: > >>> +/* Split a multi-block free page into its individual pageblocks. */ >>> +static void split_large_buddy(struct zone *zone, struct page *page, >>> + unsigned long pfn, int order, fpi_t fpi) >>> +{ >>> + unsigned long end = pfn + (1 << order); >>> + >>> + VM_WARN_ON_ONCE(!IS_ALIGNED(pfn, 1 << order)); >>> + /* Caller removed page from freelist, buddy info cleared! */ >>> + VM_WARN_ON_ONCE(PageBuddy(page)); >>> + >>> + if (order > pageblock_order) >>> + order = pageblock_order; >>> + >>> + while (pfn != end) { >>> + int mt = get_pfnblock_migratetype(page, pfn); >>> + >>> + __free_one_page(page, pfn, zone, order, mt, fpi); >>> + pfn += 1 << order; >>> + page = pfn_to_page(pfn); >>> + } >>> +} >> >> Hi, >> >> stumbling over this while digging through the code .... >> >>> + >>> static void free_one_page(struct zone *zone, struct page *page, >>> unsigned long pfn, unsigned int order, >>> fpi_t fpi_flags) >>> { >>> unsigned long flags; >>> - int migratetype; >>> spin_lock_irqsave(&zone->lock, flags); >>> - migratetype = get_pfnblock_migratetype(page, pfn); >>> - __free_one_page(page, pfn, zone, order, migratetype, fpi_flags); >> >> This change is rather undesired: >> >> via __free_pages_core()->__free_pages_ok() we can easily end up here with order=MAX_PAGE_ORDER. > > Do you have a concrete example? PMD THP on x86_64 is pageblock_order. > We do not have PMD level mTHP yet. Any other possible source? Memory init during boot. See deferred_free_pages() and __free_pages_memory()->memblock_free_pages(). So this is used for exposing most memory during boot to the buddy in MAX_PAGE_ORDER granularity. The other is memory hotplug via generic_online_pages(). -- Cheers, David / dhildenb