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Howlett" , "Vlastimil Babka" , Mike Rapoport , "Suren Baghdasaryan" , Michal Hocko , "Shakeel Butt" , , , Subject: Re: [RFC PATCH] mm: use precise current RSS for high-water accounting Date: Thu, 23 Jul 2026 09:21:27 -0700 Message-ID: <20260723162133.877125-1-nirmoyd@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: <20260723134158.1473841-1-nirmoyd@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF00021F6F:EE_|BY5PR12MB4066:EE_ X-MS-Office365-Filtering-Correlation-Id: 5e131106-37e0-4436-31ff-08dee8d68d75 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|82310400026|376014|7416014|1800799024|13003099007|10067099003|4143699003|11063799006|56012099006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(23010399003)(82310400026)(376014)(7416014)(1800799024)(13003099007)(10067099003)(4143699003)(11063799006)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: kcg++CDdsz0ZG1a7xsyeY8eNrm0R0WseK8qNJPFB2LHmRZ2RZ7lbriVgYAvuYkagB1jjXXW60ctYNKLGFVzIwnTBX4uV/t2lDCsotNluij4fPDozOqRgVOv9uFodNrTEgpVvhUj+kt+nzWQfPFBYg6wXYTjVGcwSEjbJfzCT3kHKcXD8Hdqyvjpmw1bLmX/mJ2f0iBwzDTXVZsNg7IluKfMdpAplAg4YP7PAPlvFE7N3tXUPxzGfd/6yViYP5P6rRJZtZ7r14Sl/GZTN6gSLzrmtqD4XSQVcxqeBQSANKXv7t93Dp7XlCS05BpBh5SjSOWPbPVikZGBJ8r5Lsx3XtNkrIBZlYcfOChmowpW7QbymCtVgetld9HLiDhhYc5HMcUZYrhUpm9zwsH1dG5aXFFXw2wPVXBIfPSlHppkqFqCD/aYEI5d8XF4YAr7Ztd5p X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 16:22:12.5222 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5e131106-37e0-4436-31ff-08dee8d68d75 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00021F6F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4066 Hi Mathieu,=0D =0D On 2026-07-23 09:47, Mathieu Desnoyers wrote:=0D > Did you compare this with my hierarchical percpu counters series ?=0D >=0D > https://lore.kernel.org/lkml/20260707131544.75906-1-mathieu.desnoyers@eff= icios.com/=0D >=0D > I've sent it to Andrew two weeks ago but have not heard back from him=0D > though. My series attack the same issue you are trying to solve without=0D > increasing overhead when reading those counters.=0D =0D I tested the v20 series on a dual-socket system with 352 CPUs and=0D 64 KiB pages.=0D =0D On the v7.2-rc4 test kernel without the series, getrusage03 failed=0D 10/10:=0D =0D TFAIL: child.children =3D 270336, expected 307200=0D =0D With v20, it also failed 10/10:=0D =0D TFAIL: initial.children =3D 0, expected 102400=0D TFAIL: child.children =3D 262144, expected 307200=0D =0D In v20, get_mm_hiwater_rss() still calls get_mm_rss(), which uses an=0D approximate counter read. The series did not help this test.=0D =0D Let me know if you want to me to try out something else.=0D =0D Thanks,=0D Nirmoy=0D