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 4CCAEEA4FAE for ; Mon, 23 Feb 2026 11:27:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B0E806B0088; Mon, 23 Feb 2026 06:27:44 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id AB8056B0089; Mon, 23 Feb 2026 06:27:44 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9A7286B008A; Mon, 23 Feb 2026 06:27:44 -0500 (EST) 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 878496B0088 for ; Mon, 23 Feb 2026 06:27:44 -0500 (EST) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id D79D8C2E48 for ; Mon, 23 Feb 2026 11:27:43 +0000 (UTC) X-FDA: 84475496406.04.E35658A Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf30.hostedemail.com (Postfix) with ESMTP id 024648000D for ; Mon, 23 Feb 2026 11:27:41 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WxomJKx5; spf=pass (imf30.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771846062; 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=rjdW17GJScJnMJuXkzBJzMqfXGV5x8IXtFVhpJFR8pc=; b=YAD+y6KYT12yntBmSzl0X+5VxXwp1lYG+GDdVvcDaqbW+wpcPH7vfORhXzGMDITf4WEYVC ZbYqLjrd0KWl4jfOzzE+AW2NZjhtjBTnPqVnjKZW8YSbAiwnV778HiMQdZvuTklih0JunB 9X6O87pwNiMtjhNE9Od319W/+jy8kG8= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771846062; a=rsa-sha256; cv=none; b=dXZHL7hiBu+l+U7RlrJOh7qtRu3c2TsuLB19zxFs85wipbxBsLa91IK8Qiw7j3qnPf2AfC SRtD4uFN/nCILUJz4CZdzSwkfMLXf/tNErB0mhpEZ1OFd/miE14+K6swG21wzQFaxoV0VJ UB/R3VqkGqnVSTgr8+u4iyORF+831NQ= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WxomJKx5; spf=pass (imf30.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id E29AA444B1; Mon, 23 Feb 2026 11:27:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9EF1C116C6; Mon, 23 Feb 2026 11:27:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771846060; bh=IgbWkQ4+Vmc2cDQbjDQKwhY3CckSl6nKs7C1cc1tLS4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=WxomJKx5GCBhAw6iv03KC7KELLRBQjZZ4iTcKmVM7F0U0FBjpdevI4tb30MZEcRwh OEe4feh//Jb6Z0HyNAulHjENW6/E7B98CStPLQi5HJbO51xGJrntHK512lDFeGlVTj hW4ebQQ/RKN6sdh5/Q1blFYy/keK5GPVhDHpFgrR8Vcq7VomhUeQVVpdVRKZ9PWF52 7s+3RqbmSb1XwgnNDEWXwB6207/RwtDO7HKRzMCMG9c8nBIks8OhxlUDRKrTXtraJm AicG6oOFhmD8TiW/M35/bTQgqcU6D2UC1nlGmqtcbzYqp5Tp4SpHX1g6sOqulRJi4h GYlm/KyAa9MYg== Message-ID: <06684dc4-3902-4452-824a-ee2064314d24@kernel.org> Date: Mon, 23 Feb 2026 12:27:33 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86 To: Kiryl Shutsemau Cc: Kalesh Singh , lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport , Matthew Wilcox , Johannes Weiner , Usama Arif References: <915aafb3-d1ff-4ae9-8751-f78e333a1f5f@kernel.org> <17c5708d-3859-49a5-814e-bc3564bc3ac6@kernel.org> <32ed82dd-62c3-4a5c-8bae-9465afd7e75f@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 024648000D X-Stat-Signature: awxht3rbcbigm85e4u4aoj5u3s3baq83 X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1771846061-704558 X-HE-Meta: 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 kADk6Y7K DPBJCE0a12Qf2ay+toMe7MmKH4NeqbJDTtPqxDvVP17CAH3BcYUFXHgCmFa65ju/beJ7HBK82x/lCA3oAkdSUurBXwqm5z4yiCLim8qI60Hihlww9RZ1UbEM/5i18Q8geJLkwptF1mYpvkBcC77sh87KlHbV6lnGXR8p4yFsZj5xaGZUDIiSUllUvX4rfOkuEJ3VQfwlYPdK7lVZZx2+s5AgE3+kG6aEWC2Y1cS6oUeGTqwq20lFP0BGKvpkMH2AJY4ORzHMq/Q1FKUI= 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 2/23/26 12:13, Kiryl Shutsemau wrote: > On Mon, Feb 23, 2026 at 12:04:10PM +0100, David Hildenbrand (Arm) wrote: >> On 2/20/26 20:33, Kalesh Singh wrote: >>> On Fri, Feb 20, 2026 at 8:30 AM David Hildenbrand (Arm) >>> wrote: >>> >>> I think most issues will stem from linkers setting the default ELF >>> segment alignment (max-page-size) for x86 to 4096. So those ELFs will >>> not load correctly or at all on the larger emulated granularity. >> >> Right, I assume that they will have to be thought about that, and possibly, >> some binaries/libraries recompiled. > > I think backward compatibility is important and I believe we can get > there without ABI break. And optimize from there. > > BTW, x86-64 SysV ABI allows for 64k page size: > > Systems are permitted to use any power-of-two page size between > 4KB and 64KB, inclusive. > > But it doesn't work in practice. Even in well controlled environments you would run in a hyperscaler? -- Cheers, David