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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82AA9C04A6A for ; Fri, 28 Jul 2023 16:14:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229752AbjG1QOZ (ORCPT ); Fri, 28 Jul 2023 12:14:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229645AbjG1QOS (ORCPT ); Fri, 28 Jul 2023 12:14:18 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FEFA3C31 for ; Fri, 28 Jul 2023 09:13:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1690560812; 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=1Dyh7+qatvQDKM5qDRHq8YkO5TCQeLww3uN1vYmzEUU=; b=EzFo3gQj5XQ/9hIaortrhTD4LYBvIArNQeuoEUMjFSmK9OVj9+r5R7l037EK/2lLnNq90Z iCl5HGQAazJ5SxihMyCGgtE/1fNg8e8aP6nCISlzVK2BY7YZYcv/jQY5OtVem140TIuwGZ xjSysc4LiYaO9KBdfIkJceHnTkWpOxw= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-588-tzAWck8KP82uJsXsCItvpA-1; Fri, 28 Jul 2023 12:13:31 -0400 X-MC-Unique: tzAWck8KP82uJsXsCItvpA-1 Received: by mail-ej1-f72.google.com with SMTP id a640c23a62f3a-94a355cf318so136858366b.2 for ; Fri, 28 Jul 2023 09:13:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690560809; x=1691165609; h=content-transfer-encoding:in-reply-to: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=1Dyh7+qatvQDKM5qDRHq8YkO5TCQeLww3uN1vYmzEUU=; b=d7aF48MGEZv7cLOlA72cmb9sT0Td/It4ECBPUb/+zps/ach76FcxjD/VOU4LnKvmQc y9qSb/Xcdtg22g/ADGXgVZ/F2fwNvGUBUkclxnhEM9w7yg+ayUSX8m4X8VldL0nCw7yj 4UfOTrWKGEBOso88VGvqtIyisgyZ8zJfbNvfoS2V+wQHyOtRw1oOJhkaIFDcYDGokjEl SnWQNbG4HMaWe6U6VEJ9eqCgNrax7sqvVHpS29bWeTa6Me6wg+nOvVpzty7qfh94ui/O ExR+qq6K4ZhHE9h7R9epcUAELm2/pcbT9FGHIsOG10N+EvOhodWzRckkV2YL8+jG5mQf CASg== X-Gm-Message-State: ABy/qLYD9sDOFsciJWjxLlkXSM/VvFOp/nJ3qgSPBUTVaWLcc5Jl/Xig vXjtHmoRfoIj0C36DItgLsCmU2NZGeIoMwpwO7Zvn4IV34JFjE/cFlUmzd7A90TLySUveMnu2DS ZWZ+HCl13PB86Q890SUBQVP54 X-Received: by 2002:a17:906:5354:b0:99b:efd3:3dcc with SMTP id j20-20020a170906535400b0099befd33dccmr1357355ejo.62.1690560809631; Fri, 28 Jul 2023 09:13:29 -0700 (PDT) X-Google-Smtp-Source: APBJJlHd2sX/AyGtIAscRR2p4pTksaGOsuCTBRQ37WpaEGChaEB1fcJtjozFJjrwhV4jFSHGD+pttg== X-Received: by 2002:a17:906:5354:b0:99b:efd3:3dcc with SMTP id j20-20020a170906535400b0099befd33dccmr1357325ejo.62.1690560809219; Fri, 28 Jul 2023 09:13:29 -0700 (PDT) Received: from ?IPV6:2001:b07:6468:f312:9af8:e5f5:7516:fa89? ([2001:b07:6468:f312:9af8:e5f5:7516:fa89]) by smtp.googlemail.com with ESMTPSA id gy26-20020a170906f25a00b00993470682e5sm2197928ejb.32.2023.07.28.09.13.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Jul 2023 09:13:28 -0700 (PDT) Message-ID: <6da710cf-2bc0-bb6e-26f1-fba14ca767db@redhat.com> Date: Fri, 28 Jul 2023 18:13:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [RFC PATCH v11 10/29] mm: Add AS_UNMOVABLE to mark mapping as completely unmovable Content-Language: en-US To: Vlastimil Babka , Matthew Wilcox , "Kirill A . Shutemov" Cc: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata References: <20230718234512.1690985-1-seanjc@google.com> <20230718234512.1690985-11-seanjc@google.com> <20230725102403.xywjqlhyqkrzjok6@box.shutemov.name> <692b09f7-70d9-1119-7fe2-3e7396ec259d@suse.cz> From: Paolo Bonzini In-Reply-To: <692b09f7-70d9-1119-7fe2-3e7396ec259d@suse.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/28/23 18:02, Vlastimil Babka wrote: >> There's even a comment to that effect later on in the function: > Hmm, well spotted. But it wouldn't be so great if we now had to lock every > inspected page (and not just dirty pages), just to check the AS_ bit. > > But I wonder if this is leftover from previous versions. Are the guest pages > even PageLRU currently? (and should they be, given how they can't be swapped > out or anything?) If not, isolate_migratepages_block will skip them anyway. No, they're not (migration or even swap-out is not excluded for the future, but for now it's left for future work. Paolo