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 991BBC5DF8C for ; Sun, 23 Aug 2026 07:02:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 619886B0095; Sun, 23 Aug 2026 03:02:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5CA2F6B009B; Sun, 23 Aug 2026 03:02:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4E1E36B009D; Sun, 23 Aug 2026 03:02:50 -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 284EE6B0095 for ; Sun, 23 Aug 2026 03:02:50 -0400 (EDT) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 8F5EB80295 for ; Sun, 23 Aug 2026 07:02:49 +0000 (UTC) X-FDA: 85131641658.17.002DA76 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf06.hostedemail.com (Postfix) with ESMTP id DF19A18000D for ; Sun, 23 Aug 2026 07:02:47 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=oFJQKJeu; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf06.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1787468568; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rrlgIqfpPIHSqK0RV/eGVXjNicOZIO8LbhcffvSifZU=; b=GrATCmr6z4tJAjoNlIyOUXQIU71pIrFuEddTcjDfpuXv99Wplmh1ONAmiiH2GbSDPHjpSY JzVmSczDwg+D8g0TeIRbv/Gg+DCIFkk3ZZnTG+dbsWhXAx3jVuC71VCCFO8a5eiNvVG+kC c+/DveXGWCdraProyBmIz3CFi1vJGNk= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=oFJQKJeu; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf06.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787468568; b=CnxB9S7ZnB37OYgIsQmpALdI8ohyZcUiOXc2gGEJnucD2jZc08nkOVv85C4ofXcJ8R2E8n i1q/4sFqBH7S4L5RCgGnS0nk8fZE8STC/C/dlFyY7uR6668hOqYxFJY8iuTckA5tvBo7wC En61SJzx8+O6oTsf1cK9U8hm+CI0CyE= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id E824E40E4F; Sun, 23 Aug 2026 07:02:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 494EA1F000E9; Sun, 23 Aug 2026 07:02:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787468566; bh=rrlgIqfpPIHSqK0RV/eGVXjNicOZIO8LbhcffvSifZU=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=oFJQKJeuMZncT+e8e6YlISEmXQB11x8W66x7n4X6TulTEx/Z/wSdBmu2qLZBRJdRj hyv9pUZkXZGvwchBnoquA4Y7L35ecs8ywXwbsHaxds0oalhGkNLv/249xUUE9zMQuo IjIbTp2qTGvB5RyopS41bYK1ZuYRwwGC1eHMND1csjVOtylehQWDtdSgz4TAzwa7+h s8alwQI4JXTl62GPqwXqaZjP1MQzSWgK32bkAq55xEd4hXId/GgDn4a5fV15qdAmHX BRD1RGczq74PXBAn+PSR8v6Pc3PTnQ5jSEL4AjkciyRkWpdTBuGZzJcb/G3q2XUIjI LsA+P1uDfWK+Q== Date: Sun, 23 Aug 2026 10:02:35 +0300 From: Mike Rapoport To: Eric Chanudet Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Tejun Heo , Johannes Weiner , Michal =?iso-8859-1?Q?Koutn=FD?= , Jonathan Corbet , Shuah Khan , Michal Hocko , 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 Subject: Re: [PATCH 00/11] mm/cma: charge cma allocation to memcg using per area counters Message-ID: References: <20260821-cma-memcg-regions-v1-0-d21b165b8440@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260821-cma-memcg-regions-v1-0-d21b165b8440@redhat.com> X-Rspamd-Queue-Id: DF19A18000D X-Stat-Signature: pj1uaggw1c69ybge6s9eyecytz3p8bnc X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1787468567-365321 X-HE-Meta: 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 Cx3E5oxw fnjCX5iC7+U8QRjYBwG5ZsthTNdnGLIij610ozc1i2lJSuMjSkLVJpSG+o8LVNQnGahkJqCBoBRQ+T1F7ApTDSD7jO+bsM2jFxIgkRYvmmxUHf+Oywwj+JfPIIFIyekPSrRIOMsAPNhnXwy+l8QvHe/FgdbeQUf8p85ZmNPR+yMp5xLfe4KquVLFWvka3BhWqXSZwlAzA6UOVPXwfJy/NCbhwYYrVfGeqhD6BjUatEQREhq0ohAmxoF7QFloPThg1zFxeV+/rBsPXxZZuOVJ0PEzPDCjfvmi3dJA2Ppn2Hxvxu60= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Eric, On Fri, Aug 21, 2026 at 02:56:52PM -0400, 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. > > Add a memory_cma_accounting cgroupfs option in preparation for the > following new behavior. Make it disabled by default since it will > account for CMA allocations in memcg which may affect existing systems. > > Provide CMA charge/uncharge functions to memcg that introduce a CMA area > specific counter per CMA area. Charges are issued to memcg and to a page > counter for the CMA area used. The allocation's folios are marked with > the cgroup via commit_charge() (once for large folios, per-page for > 0-order ones) so they can be later uncharged correctly. > > Add the new memcg calls into the cma allocator under __cma_alloc_frozen, > for both cma and hugetlb_cma allocations accounting. > > Finally register the per-area usage counters in the cgroupfs. Each CMA > area creates a memory.cma..{current,max} pair for reporting and > limitation for each area. > > Selftests and a vmtest script are added to this series for convenience. > The tests are simple accounting and limit enforcement verification using > the default reserved CMA area (cma=) and hugetlb_cma. > > Signed-off-by: Eric Chanudet > --- > Eric Chanudet (11): > mm/cma: drop const for struct page on release API > mm/cma: include linux/cma.h in cma.h > cgroup: add memory_cma_accounting mount option > memcg: add cma charge/uncharge functions for area counters > mm/cma: charge cma allocation to memcg per area counters > memcg: register per-area usage counters in cgroupfs > selftests: cgroup: add cma configs for cgroup selftest suite > selftests: cgroup: add memcg cma tests > selftests: cgroup: add a vmtest script for memcg > selftests: cgroup: add memcg hugetlb_cma tests > selftests: cgroup: amend vmtest-memcg to run the hugetlb cma tests CI found issues: https://github.com/linux-mm/linux-mm/actions/runs/32519133924 > Documentation/admin-guide/cgroup-v2.rst | 35 +++ > include/linux/cgroup-defs.h | 5 + > include/linux/cma.h | 4 +- > include/linux/memcontrol.h | 19 ++ > kernel/cgroup/cgroup.c | 15 +- > mm/cma.c | 14 +- > mm/cma.h | 6 + > mm/cma_debug.c | 1 - > mm/cma_sysfs.c | 1 - > mm/memcontrol.c | 205 ++++++++++++ > tools/testing/selftests/cgroup/.gitignore | 1 + > tools/testing/selftests/cgroup/Makefile | 2 + > tools/testing/selftests/cgroup/config | 5 + > tools/testing/selftests/cgroup/test_cma_memcg.c | 402 ++++++++++++++++++++++++ > tools/testing/selftests/cgroup/vmtest-memcg.sh | 197 ++++++++++++ > 15 files changed, 903 insertions(+), 9 deletions(-) > --- > base-commit: 98f21c54f99519329c18e2625b0ea6db14524d09 > change-id: 20260706-cma-memcg-regions-696cb5ef7998 > > Best regards, > -- > Eric Chanudet > -- Sincerely yours, Mike.