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 74822C83F1B for ; Mon, 14 Jul 2025 15:14:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 03E718D0009; Mon, 14 Jul 2025 11:14:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 01B788D0001; Mon, 14 Jul 2025 11:14:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E6E548D0009; Mon, 14 Jul 2025 11:14:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id D6B1C8D0001 for ; Mon, 14 Jul 2025 11:14:27 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id A74BD12B70A for ; Mon, 14 Jul 2025 15:14:27 +0000 (UTC) X-FDA: 83663216574.29.8D97353 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf08.hostedemail.com (Postfix) with ESMTP id 42329160004 for ; Mon, 14 Jul 2025 15:14:25 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=RMDrgpK7; spf=pass (imf08.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1752506065; 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=IL/Ck2SyrSl8RfKZTlsk1NsUdU78NGwZg/0E+xPIuu8=; b=KbrDJBLxJCSbExLc92b4LFd9jKdbT9b1pROG4EK0ElqDpzV1DPUgZ7JbZkv4ZY1RAzoM27 rP7lOEH61wBEs2vOQH83pLtxym3KE8/j5dXHlmRxH5KEuGiElECZMjQsvVaEffrastYIlV 8s52JINA8OJ6m3NI3iwpn4J4H/bbnW8= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1752506065; a=rsa-sha256; cv=none; b=4NPfPHKWu2mp2Z+ALnWC76PLkZDn7EO5nO0PaUbfdzkKac0YFKaD1IiszPjJc5VQwczTfK IzF+3pGqpyd4AkpvnzasbYwnRzMGVf15eCn405B4E9045pARcs9eHnqJ5oEYw0o1BtTwta GO1GUCIODXkjTegfatrRjcIs8JZ3dns= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=RMDrgpK7; spf=pass (imf08.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752506064; 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; bh=IL/Ck2SyrSl8RfKZTlsk1NsUdU78NGwZg/0E+xPIuu8=; b=RMDrgpK7vg7gBQvPNDZWUF8vIbTC0tFd4GOX+WNXUJD+kLWWk5MAKr2RL9yGFihCXP1z3g FQU+q29tEVuix0UGrv85RBeNvH9gXgdXsvJrrnLfs/z+aqrSToBXbfD6ASYNnnZI0mUp0V +m8fjG8RDwcWc0dkQoAC/kUKe6B9NvI= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-582-CCvAFyvvOYW0IE076gQGqw-1; Mon, 14 Jul 2025 11:14:23 -0400 X-MC-Unique: CCvAFyvvOYW0IE076gQGqw-1 X-Mimecast-MFC-AGG-ID: CCvAFyvvOYW0IE076gQGqw_1752506062 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-455f7b86aeeso13742505e9.0 for ; Mon, 14 Jul 2025 08:14:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752506062; x=1753110862; h=content-transfer-encoding:in-reply-to:organization: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=IL/Ck2SyrSl8RfKZTlsk1NsUdU78NGwZg/0E+xPIuu8=; b=Ou3/R8uhxhkzK5lDVYWCbm4WP4EGy28ubr7kogm3BA9K9nPsLVW/bUw1xFJ+TfMZYI Z776qLPSkBUZQbQebdiYMdapE0Yn/GqH61lLhQcbFAVpMCAEBOIwp+MDj8X5fghvGP3v 7wMjh20mQbtyrwSOnMJ7NHwlB9E8sw3joigtwZKtguBs/O0f5Xn49d7TOw/p3tkWFwNQ JuZPCNormSl/7ViZt+UgR1/RabPD/W7YpdCY2beVbL4iTTQZLged3IYwTZnlNlsO7Ts+ RYgR2WINA0MXi/iCN2xOeEn/pSn5MfSaLF3Rk0BwqOzG7PSzxZBH7Gi+ntcHutdoHLHg s8gA== X-Forwarded-Encrypted: i=1; AJvYcCXDeg0XV60Ga2M6dCwVbGL3zZ1N9e1pCX0DFppxyjMRSiZA8iXxa0+ZaEvzQ6aOGPXmO9JzThsLWg==@kvack.org X-Gm-Message-State: AOJu0YzPRZsSMFlzHqBd2yOvkWhE4CQrVs1nHwE3E4/VBEI6cuQe1wSa G6r3Bb/Krq9yydxTVUp5nSwukk0Xj6WwYMG2tNhxjxQfVcyo7F6MA3Kx9nn4oWWGLF3yGS4Xk0i WU3/Q7R/HgL7bmnlvWE2r2MVB4h5Wj8BQzQsJGDLwze+kc1vjkFYZ X-Gm-Gg: ASbGnctbohvvNSiRB3wkTnQmDZAxnJSQFaFlyFToeNflakNmHTpUU+xEl7GYsenxgtd Xz1z9zj61FOHYBHHu/tFoqsLRCiMQI/Ji+KWLJBFEU2G+QEAe66MBH5KJBNObnyhsaF/pd03foc E9dNiqjHLK9w+Abra8uN6wLDHPdcvKBuZ/mJVmIGXBlpzydSdpQG70XjD+a7pqt3KKIJK2bMMwp F9pmpdqiJ+o6kktnTsnWSVS/UMZuiauBY4EurvoeGXi/WSMkhTtTU2UsLkBxVJbfeWk4TunrVLD yUPyzQ5Fq8a3wSRENRv2V9/MLAp63MLiSDFsBHtijHUkpSEqcaFFHbeX18dLBsK7vypupMvzGqQ Z15BIQrJ8GyoqJeSvneW6r4eOdxsuPP3pJFu2YY/lr6vQ/HSIp7B8KOkXo4vzDmQf X-Received: by 2002:a05:600c:1d81:b0:456:e1f:4dc4 with SMTP id 5b1f17b1804b1-4560e1f51eemr70990885e9.15.1752506061789; Mon, 14 Jul 2025 08:14:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGzeIryiH9Na6kzU/3SE5xhZjoS6VBUV85ON/zm31LHc2kWCZ8sFNmZPXaLp/k7YSkbFaruoA== X-Received: by 2002:a05:600c:1d81:b0:456:e1f:4dc4 with SMTP id 5b1f17b1804b1-4560e1f51eemr70990415e9.15.1752506061269; Mon, 14 Jul 2025 08:14:21 -0700 (PDT) Received: from ?IPV6:2003:d8:2f38:ca00:ca3a:83da:653e:234? (p200300d82f38ca00ca3a83da653e0234.dip0.t-ipconnect.de. [2003:d8:2f38:ca00:ca3a:83da:653e:234]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b5e8e0d867sm12877795f8f.61.2025.07.14.08.14.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Jul 2025 08:14:20 -0700 (PDT) Message-ID: <345f7ae6-b2d6-44cd-b8b6-2bdd4b33e9d6@redhat.com> Date: Mon, 14 Jul 2025 17:14:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] mm/memory_hotplug: fix hwpoisoned large folio handling in do_migrate_range To: "Pankaj Raghav (Samsung)" Cc: Zi Yan , Matthew Wilcox , Luis Chamberlain , Jinjiang Tu , Oscar Salvador , akpm@linux-foundation.org, linmiaohe@huawei.com, mhocko@kernel.org, linux-mm@kvack.org, wangkefeng.wang@huawei.com References: <61325284-d1d6-a973-8aa7-c0f226db95fa@huawei.com> <7b2c054b-fc33-4127-aaa9-9edf6a63e142@redhat.com> <924d9d25-e53c-f159-6ec0-e1fd4e96d6e2@huawei.com> <4c5d4fd5-5582-11d8-9fee-24828ac1913d@huawei.com> <8c9719f0-c072-40bb-b7f6-6f2cc41a31dc@redhat.com> <1D589FE5-3515-4ED5-B12E-D5CE23BA5D13@nvidia.com> <641F5B0B-2B48-46FA-AC58-3A8A4BEB1448@nvidia.com> <3702f6b0-27a9-4ca1-adbd-fb1e2985b2d3@redhat.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: TYQx9peXtPr6c9x1I3kMnev9MS71hcWmjOwh_7ouoWc_1752506062 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: 42329160004 X-Stat-Signature: agqbddjdc8ywej6j5he5srxtozd73rqi X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1752506065-204934 X-HE-Meta: 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 3N1YQwgx 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 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 14.07.25 17:09, Pankaj Raghav (Samsung) wrote: >>>>> So we will need to take care of madvise cold or pageout case? >>>>> >>>>> Hi Matthew, Pankaj, and Luis, >>>>> >>>>> Is it possible to partially map a min-order folio in a fs with LBS? Based on my >>>> >>>> Typically, FSs match the min order with the blocksize of the filesystem. >>>> As a filesystem block is the smallest unit of data that the filesystem uses >>>> to store file data on the disk, we cannot partially map them. >>>> >>>> So if I understand your question correctly, the answer is no. >> >> I'm confused. Shouldn't this be trivially possible? >> > Hmm, maybe I misunderstood the question? > >> E.g., just mmap() a single page of such a file? Who would make that fail? >> > > My point was, even if you try to mmap a single page of a file, page > cache will read the whole block (that corresponds to min order folio). > > Technically we can mmap a single page of file, but FS will always read > and write **at least** in min folio order chunks. Okay, so it can be partially mapped into page tables :) What happens in the background (page cache management) is a different story -- Cheers, David / dhildenb