Received: by 2002:ab2:1347:0:b0:1f4:ac9d:b246 with SMTP id g7csp408761lqg; Thu, 11 Apr 2024 06:49:20 -0700 (PDT) X-Forwarded-Encrypted: i=3; AJvYcCX+OU7RnM378AdmDNoRnMCJjzkutM5az3enG3ZCJ7YTboOdrxAA5HbLkReYucV42JiwegZneE9D2o0fyxaSw6c4Wy9S5THtG1EY3vDvtA== X-Google-Smtp-Source: AGHT+IFKvilspuLqso9YmiMMxCb0CUyr8kZg3dqjfImHjXCmLUrXX97XxrqoiwdEIrD2+YNm6K+O X-Received: by 2002:a17:906:fb15:b0:a52:2cd6:c420 with SMTP id lz21-20020a170906fb1500b00a522cd6c420mr249367ejb.26.1712843360074; Thu, 11 Apr 2024 06:49:20 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1712843360; cv=pass; d=google.com; s=arc-20160816; b=TGyEYU3PnH0dI04TgmN8RcpSlWfSCO1tJdi7xHy1ZfopYAgqPCTZNdnWIbJxeMXxXw CjgiMca2cQf1NKTUWXgxe8itznko42jiw0e4tRA89KMtf6Uc/vvPIAetYFp0EPy0Gz5n KOsiG0k8wWj5OU2lS+wYCZ3ufw4eb13FFlTi9JsFSaLfIMItr66VNyuQS2Rz0/HezwUs fNwoVaMtEsvfzPCHWPrX6+VNDZQVA2jsps7LUlD2UD6qag4HAuqvtz7hjn20K7SefRDG fTBLodeodc+n1BMuRrT8VNMXqNfZyWTMMApuCutxMmp0SboHLLoTEw5SjGvVh/7c3jd4 5a/Q== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:list-unsubscribe:list-subscribe:list-id:precedence :date:message-id:dkim-signature; bh=F7Urs0rDzbqxItHnrZ7ae7xENmqnSenFgbOKlg0MdQ0=; fh=pLMALBMejACfrZIJ1nhrnfM4iGq8xvugU76ys0HdY4A=; b=ZKxFpdxvj+b0J/7sVSZAao9mfwWPt8VIGBafjDljpJUtBHvhLg96ofXG4/ZII/OmLa 1VM0KcrQqBU+gd2ifAE0GwS+itsXAFNXxFP7F1tsjR7vbdEFz+EBPodwLF3vObmsjPQ3 7FZVO0gdU/f8+w2yb48amlOZY4rlaJmfZ+Mw0c6QDKrQN1WxUkCOFsKWz48ce6Pn8dki VEIGi6bbC3kvjL39sXh2YKC3baUJmCQA8dT1TsGadIfz4UWREM8z485EwJF4aDfvTgEG 4UpuL+iMYE1cUynQND8TkaM5/p+gRNGmrKlYovtxwTjkCDs7ULqM0DFRV3DJvH72+izj 6TUA==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Qnr472qY; arc=pass (i=1 spf=pass spfdomain=redhat.com dkim=pass dkdomain=redhat.com dmarc=pass fromdomain=redhat.com); spf=pass (google.com: domain of linux-ext4+bounces-2033-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) smtp.mailfrom="linux-ext4+bounces-2033-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. [2604:1380:4601:e00::3]) by mx.google.com with ESMTPS id ov9-20020a170906fc0900b00a51c36021e2si783252ejb.200.2024.04.11.06.49.19 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Apr 2024 06:49:20 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-ext4+bounces-2033-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Qnr472qY; arc=pass (i=1 spf=pass spfdomain=redhat.com dkim=pass dkdomain=redhat.com dmarc=pass fromdomain=redhat.com); spf=pass (google.com: domain of linux-ext4+bounces-2033-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) smtp.mailfrom="linux-ext4+bounces-2033-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id A11F91F21C9A for ; Thu, 11 Apr 2024 13:49:19 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 22B1E14EC5E; Thu, 11 Apr 2024 13:46:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Qnr472qY" X-Original-To: linux-ext4@vger.kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 60AAC14E2C5 for ; Thu, 11 Apr 2024 13:46:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712843164; cv=none; b=qPUyW2DkakKl/D3pTayBRzB9jN9Xh9v7/GYad8elibjYm1kcS4cG77+h6ZsMFtNhc2Zf1IFVVRkTyQiNdVy+Aqv123KkJ7Ox5tEdCZR026ze+NYDr3wzu5QXJvwu0Q634U20Kj6tXyRD96BU5lVjdzMs3kREU/QlCH8++vfhZjc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712843164; c=relaxed/simple; bh=Cbd/JWEjqPlGu1by3uygBOshRGfgss8BPdmBpj3a8d0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Ji3uZ0d0d0eemxjMKN0i3sAKBB1eMag6rCdON4CaCVZ4VWJEol3Lgp3BjpbecH2wN3zKRbU/+K4VRvweljoWCALkYLRcuNSesgk4aNSyba2qszgpT6zBnIqnabiYzY/+PpI63k2i+YdbxF0zHPigZoPzYhKvUvbaRQmLzgwcS3c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Qnr472qY; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712843162; 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=F7Urs0rDzbqxItHnrZ7ae7xENmqnSenFgbOKlg0MdQ0=; b=Qnr472qY2PnQgPGhTQUtcmwNobkyuNTCWxDR/mAckKUjlVqYFGiKvcOSr5FwpbcVXlFrAL Lg1+UuOWZXqDIwPvgnHgRI+/z2EztkGE5ufYFTrdLbjRn0rkcfxiEojA/k5cYXA3xA3N7C LNahx/CUU8WqjCV9nyVgq0HeTX6DOX8= Received: from mail-lj1-f198.google.com (mail-lj1-f198.google.com [209.85.208.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-201-OFPWVcyVNZCdTW10mj5URQ-1; Thu, 11 Apr 2024 09:46:00 -0400 X-MC-Unique: OFPWVcyVNZCdTW10mj5URQ-1 Received: by mail-lj1-f198.google.com with SMTP id 38308e7fff4ca-2d86a38bb94so58527591fa.0 for ; Thu, 11 Apr 2024 06:46:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712843159; x=1713447959; 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=F7Urs0rDzbqxItHnrZ7ae7xENmqnSenFgbOKlg0MdQ0=; b=OBTkj7ARYe+Vpooj50TZF2afz5RiVZeNNkThl/LJpA1PPnan6DjlXVSo/wak1tt/UG +atjR16zfgKMavAJPLuXU+6HtVjnMkuyacj9S0JUsnKL5TSka8hh+RCSmL+B9HmXky/4 oHT23wuzpf2jzzwtnLNi8HRZk3GDTgJWXWuN3RipSlFsaUC/k56L5oSfV4Bo+bSGusAo m6nj68QP11BSQPotv+c9FqDvf3iHKz7td9cLMtY3/QxOFg5EMX65zXPEr/S+n56gPcbe USLLMJOxK9ch9u6UJqk0fZGJlYvwYNQ6uylk9xFCXoILdMkc//wAz4AtQAfEBD62y7qN I6hg== X-Forwarded-Encrypted: i=1; AJvYcCUQy9YvSAr/r/zCqKu4VJKyU1iz7d6BVtxSxE8rpHvB1rRgFiUNnorXZPXNl+tq1m8b0AVPu2rcNF848C6BgfyLFX1L2tK9FSjD6g== X-Gm-Message-State: AOJu0YzuxIjdiBaB11kGRGi63nw/4S+jlSJV3LAy8zH+tnjPrzZc8/M/ EDGdogpzrWlOYPvtBEWiXALQ2w7NlcempdyozQr/V7Luqsr8h+BY+g2OB96dKQykqbog5/iVV/m +TwZv52mhlt0PaFQC7JboaipAda9TIAmK1T41hXQeiNb6Us6Tg2gxmaFyLtk= X-Received: by 2002:a2e:bb8f:0:b0:2d8:60a4:cfa with SMTP id y15-20020a2ebb8f000000b002d860a40cfamr3198622lje.41.1712843159357; Thu, 11 Apr 2024 06:45:59 -0700 (PDT) X-Received: by 2002:a2e:bb8f:0:b0:2d8:60a4:cfa with SMTP id y15-20020a2ebb8f000000b002d860a40cfamr3198599lje.41.1712843158943; Thu, 11 Apr 2024 06:45:58 -0700 (PDT) Received: from ?IPV6:2003:cb:c724:4300:430f:1c83:1abc:1d66? (p200300cbc7244300430f1c831abc1d66.dip0.t-ipconnect.de. [2003:cb:c724:4300:430f:1c83:1abc:1d66]) by smtp.gmail.com with ESMTPSA id jh4-20020a05600ca08400b004147db8a91asm5427425wmb.40.2024.04.11.06.45.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Apr 2024 06:45:58 -0700 (PDT) Message-ID: Date: Thu, 11 Apr 2024 15:45:57 +0200 Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 09/10] mm/khugepage.c: Warn if trying to scan devmap pmd To: Alistair Popple , linux-mm@kvack.org Cc: david@fromorbit.com, dan.j.williams@intel.com, jhubbard@nvidia.com, rcampbell@nvidia.com, willy@infradead.org, jgg@nvidia.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, djwong@kernel.org, hch@lst.de, ruansy.fnst@fujitsu.com, nvdimm@lists.linux.dev, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, jglisse@redhat.com References: <68427031c58645ba4b751022bf032ffd6b247427.1712796818.git-series.apopple@nvidia.com> From: David Hildenbrand Content-Language: en-US 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: <68427031c58645ba4b751022bf032ffd6b247427.1712796818.git-series.apopple@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11.04.24 02:57, Alistair Popple wrote: > The only user of devmap PTEs is FS DAX, and khugepaged should not be > scanning these VMAs. This is checked by calling > hugepage_vma_check. Therefore khugepaged should never encounter a > devmap PTE. Warn if this occurs. > > Signed-off-by: Alistair Popple > > --- > > Note this is a transitory patch to test the above assumption both at > runtime and during review. I will likely remove it as the whole thing > gets deleted when pXX_devmap is removed. Yes, doesn't make sense for this patch to exist if it would go upstream along with the next patch that removes that completely. -- Cheers, David / dhildenb