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 2AAF9C61DB9 for ; Tue, 25 Aug 2026 15:46:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0FB7E6B0095; Tue, 25 Aug 2026 11:46:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0ABD16B00A7; Tue, 25 Aug 2026 11:46:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EB78C6B00AF; Tue, 25 Aug 2026 11:46:09 -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 C0BE26B0095 for ; Tue, 25 Aug 2026 11:46:09 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 59724A3A40 for ; Tue, 25 Aug 2026 15:46:09 +0000 (UTC) X-FDA: 85140218058.22.04ECBA8 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf28.hostedemail.com (Postfix) with ESMTP id 82E35C0011 for ; Tue, 25 Aug 2026 15:46:07 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Ldb23ZRD; spf=pass (imf28.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; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787672767; b=4IKvv3mjagWSYuwziHPjHX94gTOz8lzlMlrXj2o3nVlKZKRXJlIVgFr4eJnzK3EzGEVS5i eqD+v5u7e8nniszViXk8C6PIIefshOv4dEguBNhhYOSz+msEBYClzio9+zgJom9WcvMVDT j01NMKQOJi5WhztJxmWTa9mzZOEnxFg= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Ldb23ZRD; spf=pass (imf28.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=1787672767; 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=4ZS6vls3JJvraikbo58pM3Byu1hOLRqYEyusdsObgZQ=; b=F2J3j/cxJtksHU66cvJk8kM6ODc7+g6Yt2vXLZrQMRcp6nDmMnhYmM2YN6vO4KFhYzf/Bw blkvl2BFXfZaMxw0Gni/7j13euPODIaT05VHMam1DFrzRkqUvWeaR+myyKphQEAS4Gu2kX rJ15msxqIRERjqm9rTWHhzaQUaW4B8Y= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 51898401FB; Tue, 25 Aug 2026 15:46:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F3B1A1F000E9; Tue, 25 Aug 2026 15:45:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787672766; bh=4ZS6vls3JJvraikbo58pM3Byu1hOLRqYEyusdsObgZQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Ldb23ZRDdCE+NR/qzf3ORdHVGJXRkcBRGijiRjYrlJNvjKXObnTdKWyPIZCDJcDzm RShkQ/flAw0okf21wCi8biSaT4GTCUqE++tZZdUD451vSrs0KdNOjPYxOI3YJWIPTC 35h6QTRoKf3TIV8/UIvPUfRxBLmVNatdJUMpTsys7wgU8bf06MDm4rlS8v2RLn4OkA 7m/Z/rWwqHQ7ST181CHP8FJPe9WZcGr50Zr21XKQXhc2OKsc8QknFx0H0hFZkhhlUh DDQawLEGXCDPQe1TVMTjgWHYpGCj9L7zK4OLLCM7TgypAYFxeRfD2T1/8Fjv4J4wTx l0Z6YCDKzDS/g== Message-ID: <5970a8d4-fe7c-4dde-bdc8-1c66bfb57f12@kernel.org> Date: Tue, 25 Aug 2026 17:45:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/11] mm/cma: charge cma allocation to memcg using per area counters To: Eric Chanudet , Michal Hocko Cc: Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Tejun Heo , Johannes Weiner , =?UTF-8?Q?Michal_Koutn=C3=BD?= , Jonathan Corbet , Shuah Khan , Roman Gushchin , Shakeel Butt , Muchun Song , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Maxime Ripard , Albert Esteve References: <20260821-cma-memcg-regions-v1-0-d21b165b8440@redhat.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 82E35C0011 X-Stat-Signature: 8ofwtakrgkydo1t9rz7ftnz6nbgzjz63 X-Rspam-User: X-HE-Tag: 1787672767-888603 X-HE-Meta: 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 lKoudPEX +bxjzYWnvzDTFTDk2HE0ErG4J7O5s5x5Axcgp5td+fKiLTOFRKV3M4rzB9j8s2c5xhqU+d1xevMm8Yn+1Vncqx+yNyAF7EEs8ZP9sBElCfVH8YzvCE1C6wvbCYTFCCx8vNCt6M0MpGW155c7R4oUtxxgqRSRrTvlNXR50QKIsD5phGXu2s4ALxTnR3xei9VfT0j+r8O7+ZU18eMtDlYtHsP5RxAHBGMkZPgjF/BWn1PmWMmVFNX0RY0At9otl6rvZnTge Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/25/26 16:47, Eric Chanudet wrote: > On Mon, Aug 24, 2026 at 10:58:18AM +0200, Michal Hocko wrote: >> On Fri 21-08-26 14:56:52, Eric Chanudet wrote: >>> CMA allocations are currently unaccounted for by cgroup memory >>> controllers. As system resources, they should fall under memcg, but CMA >>> areas partition the available space for different purposes and memcg >>> doesn't have a good representation for that. >> >> Which CMA usecases are covered by this work? It would be also great to >> spend more time describing usecases. > > We would like to offer some usage guaranties to userspace processes > ending up doing allocations in CMA. How does this e.g., relate to hugetlb allocating from CMA, to then charge to a hugetlb cgroup? I always thought of CMA being a low-level allocation mechanism with various different use cases, and actually the higher-level users should decide how to/what to charge instead. -- Cheers, David