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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nikolay Aleksandrov Subject: Re: [RFC PATCH net-next] net: bridge: Move long delayed work on system_dfl_long_wq Message-ID: <20260510155438.GA122361@shredder> References: <20260507134815.295588-1-marco.crivellari@suse.com> Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260507134815.295588-1-marco.crivellari@suse.com> X-ClientProxiedBy: FR4P281CA0062.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:ce::19) To SA3PR12MB7901.namprd12.prod.outlook.com (2603:10b6:806:306::12) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA3PR12MB7901:EE_|IA0PR12MB7774:EE_ X-MS-Office365-Filtering-Correlation-Id: de5a4598-c994-42d8-ac3d-08deaeac763b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|56012099003|22082099003|18002099003; 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This workqueue should be used when long works are > expected and it is a per-cpu workqueue. > > The function(s) end up calling __queue_delayed_work(), which set a global > timer that could fire anywhere, enqueuing the work where the timer fired. > > Unbound works could benefit from scheduler task placement, to optimize > performance and power consumption. Long work shouldn't stick to a single > CPU. > > Recently, a new unbound workqueue specific for long running work has > been added: > >     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") > > Since the workqueue work doesn't rely on per-cpu variables, there is no > obvious reason that justify the use of a per-cpu workqueue. So change > system_long_wq with system_dfl_long_wq so that the work may benefit from > scheduler task placement. > > Signed-off-by: Marco Crivellari Reviewed-by: Ido Schimmel