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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 11560CA101F for ; Fri, 12 Sep 2025 13:02:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4F72F8E0003; Fri, 12 Sep 2025 09:02:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4CEB98E0002; Fri, 12 Sep 2025 09:02:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3BD458E0003; Fri, 12 Sep 2025 09:02:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 2E28F8E0002 for ; Fri, 12 Sep 2025 09:02:27 -0400 (EDT) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id D5B341A07DE for ; Fri, 12 Sep 2025 13:02:26 +0000 (UTC) X-FDA: 83880611892.24.935F704 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf28.hostedemail.com (Postfix) with ESMTP id 63353C0022 for ; Fri, 12 Sep 2025 13:02:24 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=bx9WnM4q; spf=pass (imf28.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 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=1757682144; 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=T6pmjetwrY6Pjkps/LwmTPHSQvgSA/RNS+9TNChzIHs=; b=GVn+0iiSJnCN16nnuci3PGbjINWIJGHcqEX2frQQGd2sVHK1rq23EcZn4/fNUyKd4Ap0Sm Ped6u4b5J+Lksbe2ePbTpcGsVLBv4xY7kyocaT/+4FEyVrNlcD21P7I/bpLW6cSm/2//7D +w8pdjouU9MkycfdEjqIEVkhESQL62E= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=bx9WnM4q; spf=pass (imf28.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757682144; a=rsa-sha256; cv=none; b=WH81XRjFm6YNGoONDfAvS7pKVaP603ObnYcuxlEADIps3Tzd3RqtY8hdWzZoJyzRTIbwJO uYsK+8uD8j0/Ezoul6BlCYFuAMWuzI38sEwRoOyhjBuyEBbdgqUSetoFs/wNvnzAfTB+31 OGBjPtsMIl/UT6xJU4UCgyOMUZX86X0= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1757682143; 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=T6pmjetwrY6Pjkps/LwmTPHSQvgSA/RNS+9TNChzIHs=; b=bx9WnM4qpQxSWGnfOAs9nwWX+8d4sokUVaUi2kJs57ZluJJDsArI49rciCFQ5q7O48gcmR KeE81MPapXf/bKVQpDv/+RoQDmsFvxTorPbCWEMmHK2ZWoXEMsaVUhIL3b2reHEYQybKK5 pIPow8SKs0g7HMXG49cLlTF8Vp6LDDc= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-457-44XmG_8AObmdl6UXb1sOMA-1; Fri, 12 Sep 2025 09:02:20 -0400 X-MC-Unique: 44XmG_8AObmdl6UXb1sOMA-1 X-Mimecast-MFC-AGG-ID: 44XmG_8AObmdl6UXb1sOMA_1757682139 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-45dde353979so10851835e9.3 for ; Fri, 12 Sep 2025 06:02:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757682139; x=1758286939; h=content-transfer-encoding:in-reply-to: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=T6pmjetwrY6Pjkps/LwmTPHSQvgSA/RNS+9TNChzIHs=; b=D2FpanEaAxkm1oaVl+jsnOEfoEslUtjd3HFErXCOMeIYrucpeBYDW6JfCIYWRWWV5K DWl7Zk/zLMAwth8n8SBu9XgAkbdRM80HRJspvjPlvFRo2CHeRJrDjnOF7vSBuxhGGgsA ypxz1DoWYV5KiCPpbxHAGxgZP0Bsobl9pagZizCyUTm1RW4qsbJgEBUAqZ3VUVx07fPE A1ZpZZuxnJ9MXnHOWPayxqqgDMVUAG2w4FZ+1gtaHIN6fu3hs7IWOpAYE36EhQUUJV4w 5zkq2sTrm4bSkwH7yWgClWW9fTmyvYBG7ICj+jrpWW80s42r20VmSqyeUl1c9q17S6iN mKiw== X-Forwarded-Encrypted: i=1; AJvYcCU0gxjsMnzlZnhpCciVuHAq6ZIVuVtk/HnXUtRcFMDXaos+ifxbkUbW8kvY1sVB5oRrCmD2pkd4/Q==@kvack.org X-Gm-Message-State: AOJu0YxGMFRPpkk+I15MXDhcdTYjHDWBPVryHm98TVIJdIXWTcFUMLwr D0HAcEchhXDGuntAzPahIMTBnYi5dmMlg4HbdXuFpmX56839RcAUeYRg1FK3FXnsbSodxTGhmcm Aarq1QL55HicNnaQayeH8Kh85oNnfK16BcZVWb+y6RcSyzCk1qtFQ X-Gm-Gg: ASbGncssOmtTzFUX5KJbhVw+GB1479MjzFRP+XzmSDIa/CPXcngS/8UU9Wup2TMvnjl vK8EB0cXsau8suYodq6cGHUF3IR2qW4SPBD8QjxaRm0GWB7PulgUJ52+O2PZdx0OuddKakSTtPg bZmBxllMbKT+Zu9vFXueNyWziFieJ28LHw5LuF4EW9rZmClC80QsoMVq2SPCDfjrkGiMzGm6yh+ RJ7ZX48CBPm5A+ug3YpGBB4a9yPcHPo7ZLrld1UFRCpeXOkOd6sgYs/fcAooMuVS38RAp7Toyee bmNeLIDCsx3O8BxwmwOogMrOFJWoU2Lf/hUd10LPYmxHCyn8Gnov+kzZPeyKezNWqgvW8w== X-Received: by 2002:a7b:c8cd:0:b0:459:e466:1bec with SMTP id 5b1f17b1804b1-45f211cb997mr19987415e9.2.1757682139257; Fri, 12 Sep 2025 06:02:19 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE8835/Sw5cx2XNXD41yV+ksXCYwqrt5aGn88DM3+Lr7h6frt33fSGmBjo6KK3fA6Iu30zVDA== X-Received: by 2002:a7b:c8cd:0:b0:459:e466:1bec with SMTP id 5b1f17b1804b1-45f211cb997mr19986575e9.2.1757682137932; Fri, 12 Sep 2025 06:02:17 -0700 (PDT) Received: from [192.168.3.141] (p4ff1f73f.dip0.t-ipconnect.de. [79.241.247.63]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e7607d7c0dsm6591328f8f.47.2025.09.12.06.02.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Sep 2025 06:02:17 -0700 (PDT) Message-ID: Date: Fri, 12 Sep 2025 15:02:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] mm: introduce local state for lazy_mmu sections To: Alexander Gordeev Cc: Kevin Brodsky , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, Mark Rutland References: <9de08024-adfc-421b-8799-62653468cf63@arm.com> <4b4971fd-0445-4d86-8f3a-6ba3d68d15b7@arm.com> <4aa28016-5678-4c66-8104-8dcc3fa2f5ce@redhat.com> <15d01c8b-5475-442e-9df5-ca37b0d5dc04@arm.com> <7953a735-6129-4d22-be65-ce736630d539@redhat.com> <781a6450-1c0b-4603-91cf-49f16cd78c28@arm.com> <9ed5441f-cc03-472a-adc6-b9d3ad525664-agordeev@linux.ibm.com> <74d1f275-23c3-4fd8-b665-503c7fc87df0@redhat.com> <248b4623-8755-4323-8a44-be4af30e4856-agordeev@linux.ibm.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <248b4623-8755-4323-8a44-be4af30e4856-agordeev@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: f58PKkF9gMuxlTBvcOopCZZ7ACp7Y-Ww-ycP77YLzRU_1757682139 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: rspam02 X-Rspamd-Queue-Id: 63353C0022 X-Stat-Signature: zstkmzmbeuueftira3sf9meobj8dfyto X-HE-Tag: 1757682144-420107 X-HE-Meta: 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 qsMMpPC3 6EUOUgyWa1d24e+k/GIYfkwJbcaWzdPuKfpYAnBwD4ynRmB19gYDr3SFfiwgLW85sJFOXk23Lfp4ZrL7u13tiATr34sX1amDlQ3WQkfmWad/iB/0QcThe1rStryzLTZUXhjYUan069oSgx68r5tRXA5EBzfJXjUbVgVesU1Bq2d0wyknHAlwj2tCtiGvDExInM0jhpITNQX7RCqUWzWGG8sER57FXEavYjV5HJdDq/9QbO8F+fJXI+aNwfhXFIzn4buBauH+gLEOP6yAwfHv3bB3bxx+bkqYAFGNGn52Eegvs5gTO8t26yxmssZWm1A4WMfgeXoRk/utQ71QcS6/5lHG7rOUQ3UqMvFZMxQsqtK8NjzLR83QKAgbIUW5MVMUtst3UO0vuIVEqftUGYeQwQtz5GJs0Kht9gjlMu8+CmztrZB3H7TzQ8ACWIw== 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 12.09.25 14:56, Alexander Gordeev wrote: > On Fri, Sep 12, 2025 at 02:40:55PM +0200, David Hildenbrand wrote: >> It would just be passing more context down to the architecture, right? > > Yes. Namely this one would be arch-defined and arch_enter_lazy_mmu_mode() > by default. > How would that work with nesting? I feel like there is a fundamental problem with nesting with what you describe but I might be wrong. -- Cheers David / dhildenb