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 11CD4EA4FA5 for ; Mon, 23 Feb 2026 11:04:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3B0AE6B0088; Mon, 23 Feb 2026 06:04:21 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 388536B0089; Mon, 23 Feb 2026 06:04:21 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 26A2B6B008A; Mon, 23 Feb 2026 06:04:21 -0500 (EST) 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 154076B0088 for ; Mon, 23 Feb 2026 06:04:21 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id BEFB51B6A36 for ; Mon, 23 Feb 2026 11:04:20 +0000 (UTC) X-FDA: 84475437480.12.EF479DE Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf04.hostedemail.com (Postfix) with ESMTP id EC6D040008 for ; Mon, 23 Feb 2026 11:04:18 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qnnC2bua; spf=pass (imf04.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=1771844659; 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=iHDN7EtcnbRkj581NosQCPvwrcxan8TZLSppIVbz1TU=; b=DceBtzGk1iqjiJhu93ZPq4fwR29s/QDfZYG8zcVRm/QNInm1a8MCJbD+WQHN15pPInUwiP v0fQjMRAKxu3HtqVw01JSqkvJuUHoVy3hCWwLPC7uwFCsvEipZjard+AIB3eDI5UB/9sTm ChmOLx6/khsiqvBkDzReggPeIzLKXNg= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qnnC2bua; spf=pass (imf04.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-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771844659; a=rsa-sha256; cv=none; b=slZj7sM6kb78cwpEImdt0SIIbWqo3yUXNU84k9zWSZSk+hBE9M0esJBVXvr3uJsRmdn0Qv 3EpjMOlfbZTEIFgGJdXDb5hS5KnrRg9nuH5JePZkY5JRxKRdNcqlV1Dpx5+Dy+zE6/vAdV DXOf/YHe/BIaGDCumDZopeFO3u1VLDc= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B7503444D2; Mon, 23 Feb 2026 11:04:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14365C116D0; Mon, 23 Feb 2026 11:04:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771844657; bh=FZFBzPGnCrTrHRLYhwz+nC6ayAg7fWR/PZthCgu0blc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qnnC2buaIz1PDJpLSfkIu4EawSFF3eyeGDuHOV1ld9q2Fxw8PCPVzVVPa1RDvuY4o xLRanYMyaEqK4anXJBnA6KP6JJOnLHFi2u+Jhar1VOU/kAgpNAv/Rmc+Bi0yhlfuav WxzXe4+nuSZ/3jd7OSgRcG3992pm9pjEoHhYTCzpJSRCEeLxhB8Kv+SahGfXr8bzGR cDapua6G+oFcrXLfyK/sTE9gm9hpsEgUOHzjfQa/W/aAzY4th4zgN7joUYP64KQJON MFWIXRvODDLv7sPInJl5vKQnNB0/5uAEwudpQdZKCdc3Dmqr0m6jlJZK+8uP00yN5Y 2PrW7yc20TeBg== Message-ID: <32ed82dd-62c3-4a5c-8bae-9465afd7e75f@kernel.org> Date: Mon, 23 Feb 2026 12:04:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86 To: Kalesh Singh Cc: Kiryl Shutsemau , 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> 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-Stat-Signature: b4shxdzdzg1boq4yqfusf5jxh4qs8i7a X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: EC6D040008 X-HE-Tag: 1771844658-516182 X-HE-Meta: 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 cph9ASsr 7+qtz4FlnvSbUuEQBR46Az5eYuBnsglQFO10Qi8t9GsmUoBBYu/FwSvPblLw66o8Lj6IEGPnz1nOX/WqIyhdDnAXJ8N9KIeeI4vdKmbM7wNpITfDIfFz1FBbjFMBwZMZ1y8/BVWg7XMqj+I+6Kk9xSlnJnx+aUKuezNgLKykrJ/YXe+N0aAyQLLv1t9CXWHTm5icLl60OnU53FOfDUhVBuG32sogDtZtbcSzDlKwnGEm8/nAYI377d/cyQTTplF1+w3F/nJrhRA5P3b3BEUBlhFk1oSl9xy6mwEgJuuMP0Bfv07IlnqJYcEhwxw== 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 2/20/26 20:33, Kalesh Singh wrote: > On Fri, Feb 20, 2026 at 8:30 AM David Hildenbrand (Arm) > wrote: >> >> On 2/20/26 13:07, Kiryl Shutsemau wrote: >>> >>> Well, it will drastically limit the adoption. We have too much legacy >>> stuff on x86. >> >> I'd assume that many applications nowadays can deal with differing page >> sizes (thanks to some other architectures paving the way). >> >> But yes, some real legacy stuff, or stuff that ever only cared about >> intel still hardcodes pagesize=4k. > > 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. -- Cheers, David