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 C0D33C5DF66 for ; Mon, 17 Aug 2026 18:17:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 57B076B088E; Mon, 17 Aug 2026 14:17:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 52C1D6B0892; Mon, 17 Aug 2026 14:17:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3F3C56B0894; Mon, 17 Aug 2026 14:17:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 0769F6B088E for ; Mon, 17 Aug 2026 14:17:57 -0400 (EDT) Received: from smtpin25.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id DAFC4A33B4 for ; Mon, 17 Aug 2026 18:17:55 +0000 (UTC) X-FDA: 85111570110.25.E1FAF29 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf26.hostedemail.com (Postfix) with ESMTP id 215BE140005 for ; Mon, 17 Aug 2026 18:17:53 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=A87kljH6; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf26.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1786990674; 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=Lox5beP3DWjOeR55v0A2q5EwAzNvW2GMNuP3wFJiXQY=; b=zOYMX62Qbtud5lLTU4KHUVBwq8fO2j+V7d2ACtRpYrPXWorsunxdbVkeTzWb3xbcGDRmSS cDxkqMxg23rgydJKMj5o/tzYpB5v7052gnfIBzWycBmVzxPtWSoyxHRVGqcBTd8URO3sCg xrPSM/Ic9E7+7rOqAIZX2Pp9I0iSSUo= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=A87kljH6; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf26.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1786990674; b=IRaHjqh6LTCz6/Jj4l9bzwTyKKsS+eJpso8FPZg348yoWg1MfYvT1Zxsr9CtWfN2GxfGot pl33Jwd9JSGTx1yK9ZOo0hVUD3lFvyrHxUB1OgJtXqODG9RdXNoWAvqGwj8VteCC3krSxq OpCe35F/i8TEHlFPDCOJ5Op+SYAUaFo= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 28CDB43A0A; Mon, 17 Aug 2026 18:17:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 170771F000E9; Mon, 17 Aug 2026 18:17:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786990673; bh=Lox5beP3DWjOeR55v0A2q5EwAzNvW2GMNuP3wFJiXQY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=A87kljH6QMe1mfh+7tKpGwq/QvZDIPvgAdindrhBg5loAuQSdi4lJBo/TJEm8/rCD Hq9TK538xQfBYmvp+U4qA+iLRQsNk3U8jCmAGKDw4668yAX1hddzQPiEyFv9dx/qOu Kx+9FHDm7gLxQ5BHJbme0EZKN3G9iT6obOWoVZ2axosUzXy5TVbznsLJ6Y7DL8QGcS 2Ig1pfPDWN1ZQqLzOxaYT4aStDZIex2Vz2QaV/aStvDrUoh9tPfndeUQhRoAn9Um83 RTnvJV6cxo/gRIHAfRibgz2V10L9BO0qCAOa5ZoL3oA+i0xVcaag0tFXzxNvNmKmEg tY3UV22I8wDCw== Message-ID: <85302865-4181-43d4-9c38-eb6ac57e3aa7@kernel.org> Date: Mon, 17 Aug 2026 20:17:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/9] lib/folio_pool: Direct-Map Large Folio Pool & Scratchpad bump allocators To: jim.cromie@gmail.com, Andrew Morton , Pablo Neira Ayuso , Florian Westphal , Phil Sutter , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Danilo Krummrich , Matthew Brost , Boris Brezillon , Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , John Fastabend , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Alice Ryhl , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Boqun Feng , Matthew Wilcox , Zi Yan Cc: netfilter-devel@vger.kernel.org, bpf@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, coreteam@netfilter.org, netdev@vger.kernel.org References: <20260817-folio-pool-v1-v1-0-0c1d230aa3af@gmail.com> 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: <20260817-folio-pool-v1-v1-0-0c1d230aa3af@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 215BE140005 X-Rspamd-Server: rspam07 X-Stat-Signature: ihcheq547dsqcr7y8dd3ozdba8xu17d3 X-HE-Tag: 1786990673-636894 X-HE-Meta: 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 QN/eWNw8 YB7wvpl/GUmngkZM60VuAdK3cuyCLZ69esph0Ylsih+Putgs+VCuDfwp6midDvRBt3IFIceBJI9lnK74NCSCon9QldFmMXOiY7gL/Ky4Ta5esqn/WOZeWN2dkxVTNZytMW/w4r5121WQyKlukx0b9RlCzyzaELdD+GHFAWuIrAG4MfRaNGZ89adBFeQyVPKlM+ImCX067tFkDOzlihdjuzqE52VpVB7YtSotuvvpf9C6HpnPXn1eLhKnhcU61//uI7njS96Bgv0Fi6nwF6JKencVJLu3kURyDGqo1spqs4uqyFJOQEGFtD7flmUBd+5yWGY0+uqCKfQCierc9KxF+1pE6SsPmK7/jKmaEcvTx61AuluyQoWYKrzEOnm92TNM6ScRo Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/17/26 19:22, Jim Cromie via B4 Relay wrote: > Introduce two light-weight bump allocators backed directly by compound > folio pages from the buddy allocator (skipping SLUB metadata overhead): We are running into a bit of a naming problem here: folios are really supposed to describe things that we will map to user space, whereby we have to track mapping/index/mapcount etc. That's really just anon + pagecache memory. Right now that naming difference doesn't matter, because each compound page really is a folio. But once we start decoupling folios from the rest (memdescs), we really only expect anon+pagecache to resemble "folios". There will be other compound page types (similar to slab pages), and things like page_folio() will fail for them (like slab pages). And we are actually working on making page_folio() fail earlier for anything that didn't go through page_rmappable_folio() as part of the (folio) allocation. So, does what you do here fit the definition of folios, or is it really just some kind of compound pages? -- Cheers, David