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Wed, 13 May 2026 00:55:27 +0000 From: Aaron Tomlin To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, mst@redhat.com Cc: atomlin@atomlin.com, aacraid@microsemi.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com, liyihang9@h-partners.com, kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, shivasharan.srikanteshwara@broadcom.com, chandrakanth.patil@broadcom.com, sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com, suganath-prabu.subramani@broadcom.com, ranjan.kumar@broadcom.com, jinpu.wang@cloud.ionos.com, tglx@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, maz@kernel.org, ruanjinjie@huawei.com, bigeasy@linutronix.de, yphbchou0911@gmail.com, wagi@kernel.org, frederic@kernel.org, longman@redhat.com, chenridong@huawei.com, hare@suse.de, kch@nvidia.com, ming.lei@redhat.com, tom.leiming@gmail.com, steve@abita.co, sean@ashe.io, chjohnst@gmail.com, neelx@suse.com, mproche@gmail.com, nick.lange@gmail.com, marco.crivellari@suse.com, rishil1999@outlook.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v13 4/8] isolation: Introduce io_queue isolcpus type Date: Tue, 12 May 2026 20:55:05 -0400 Message-ID: <20260513005509.135966-5-atomlin@atomlin.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260513005509.135966-1-atomlin@atomlin.com> References: <20260513005509.135966-1-atomlin@atomlin.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BN0PR03CA0004.namprd03.prod.outlook.com (2603:10b6:408:e6::9) To CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:70::10) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB3523:EE_|CWLP123MB4226:EE_ X-MS-Office365-Filtering-Correlation-Id: 611b4106-9342-40b2-4847-08deb08a52b6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|7416014|3023799003|56012099003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?KJz3SpnUsuhKos2hP5f0Pp6zrDAU1Q9U2QZMCITG8kc93zE4Zw3AIDajL9cl?= =?us-ascii?Q?MAWCJTsNOY4ldDdUK90BxHJ8t8VjoUX1C0XXW5S999z5z0Q2a3irD/iGuZLs?= =?us-ascii?Q?JqgHBbf4fvtA8tFWf80NyltRbSpl4D2XfcemzbymK5SVGDoOK4Rz6esfW4KL?= =?us-ascii?Q?+ciI2Dm7xqhkiGP5GPjUizQKTx1t4aDZq4i3A98rGvyE2bSdYz8szAUWqFoQ?= =?us-ascii?Q?Fn0TIdiY4QRtfxOTXUoBM9sqXRLvCsX1Smph/8/t4pyZjYzYPjfkwYNDC8hs?= =?us-ascii?Q?C1p1Yk6Sq/LUmx1bCbI9uw4aYsqFSygYRdhzLDGnmyeVbIvdN92VpPmx5xSV?= =?us-ascii?Q?3UTmytFWbo0uPivbfg+9RQXO800rluXy81c7toStyvFroryucHXqq6qa/jDt?= =?us-ascii?Q?Jmv7VLBMP1C2klZuUB0nQuT3cNhEOWozxpObO9vJryaBZDqwcZImlA+sMIrc?= =?us-ascii?Q?Xu7epMeBXDZ7F5VDUD4wsv4EqHCQIGDNdoVKBKBk/iD4/V/9s5IjrlVls7IT?= =?us-ascii?Q?x1cLDAiyF8ZZOergdgjiY8NqZHSBEbMmDfO9U4EqVfixFlQOHorOAwL7V4lW?= =?us-ascii?Q?7Fx0q5UjQYsu06MBeZPMTVa8GX9KL//ktPCAMu+tlnKcJOdhpHEYogLxC7r7?= =?us-ascii?Q?xw5AcADfgAAnjRHQuOuZUWJukTxQWQaLQPrGtBWIFNg5XkDB1guDDMtbgvB6?= =?us-ascii?Q?mN4i2zMtMX33OtO6rBMoX4qOta9XtiytHyPETwofBuzCnchgp54jV1Fb8O6f?= =?us-ascii?Q?CKlB9ODFw1gkoWZwVzvrXKV2vpugCak/soGK9ZXf7SKAtkFzWc+1Q3jC9nWs?= =?us-ascii?Q?YfzVOtbsVvksqE6mDjNNf7Cn61pK5UvzW8s7jhWbAhTfxfrpsJAp78mB865J?= =?us-ascii?Q?pY0co4DFOV6BLuSualcZscjhYgrEr+LJv1bwG5PvsJ/di3SyyvZ5lngDsmqL?= =?us-ascii?Q?IFfrVviIdmCJvKr8MYZsG48/9eYzi+tdsOZ7d55lbv4gH8XJ7jTVE8+YERII?= =?us-ascii?Q?c5hunqveSPEMy+lHUNKEgxWGsZQxAgZEOa0cQlRejAiRZQqpILJUz3geJcsj?= =?us-ascii?Q?suKd3aB1ld4v1wHjowI9ONK1PH6kWL/IJ4DoWMrJgnfXZj4UQxmSg/hItaO8?= =?us-ascii?Q?jgMQVRLYa8N5YgSQFWuvT15CuuQnjiW0l+PaUQe1dsg38WC7X36n05ss9mym?= =?us-ascii?Q?rhlJkQZEuFfPsJPEQIlwZ0gSCWKbAoEs9hQN6nvBYnlx8OXz89/HZpSytsTj?= =?us-ascii?Q?lDrEInQVovej1kdccN3TNCK+6QB8t+NFDaMX+iHN12yVewDcOt00J/EQrdRE?= =?us-ascii?Q?cOgv2yP0KShTg+0a16kH+zIQ3ZBddxJhAu9BqiDqTc34zOB9hULX1Bb4tLwE?= =?us-ascii?Q?N6brrR9QLffpgw7oqbHwJJQshuKvvpNadLjdC9wOvILob0YALjSzanGSOVaf?= =?us-ascii?Q?JhzszFvADEvhv3Mmghc0iQMGB4tg+Yd40DPATonharp1imc6f0WGrQoS8lTs?= =?us-ascii?Q?fpOJIlruEZb+33FOeBNVsqqliEAGEgVdsDO3EuR0JHj9O/lu1X9xppuV3/2O?= =?us-ascii?Q?eTIq+Z5p6hLhCTqtetU8IhTnVZTUMl9FWznjKAClLNnZt7uPNwqjuHHPYpn3?= =?us-ascii?Q?lGEAzVnSDZbtfQL6UYQc4oigCmVk3zmakuWRifJs2BArxGPwSpmBhnaKReVq?= =?us-ascii?Q?MuDi3nlKn0e0aoS0bHi/VjCE1Lo/GkhJTtnzjbUDJS+XXT1xuGPk4HXqob0e?= =?us-ascii?Q?ANYcBzCfXw=3D=3D?= X-OriginatorOrg: atomlin.com X-MS-Exchange-CrossTenant-Network-Message-Id: 611b4106-9342-40b2-4847-08deb08a52b6 X-MS-Exchange-CrossTenant-AuthSource: CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 May 2026 00:55:27.3803 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: e6a32402-7d7b-4830-9a2b-76945bbbcb57 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 7vZEwbqyMFcJoKGVeNnBDOTRaZgPADjoBRbOiHXC78C9H4EMpGQx/+C8QV6kCzSSR4HnZYmyGTKuK0OWG9r0fg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CWLP123MB4226 From: Daniel Wagner Multiqueue drivers spread I/O queues across all CPUs for optimal performance. However, these drivers are not aware of CPU isolation requirements and will distribute queues without considering the isolcpus configuration. Introduce a new isolcpus mask that allows users to define which CPUs should have I/O queues assigned. This is similar to managed_irq, but intended for drivers that do not use the managed IRQ infrastructure Signed-off-by: Daniel Wagner Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke Signed-off-by: Aaron Tomlin --- include/linux/sched/isolation.h | 1 + kernel/sched/isolation.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index cf0fd03dd7a2..30cb9a44365e 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -18,6 +18,7 @@ enum hk_type { HK_TYPE_MANAGED_IRQ, /* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */ HK_TYPE_KERNEL_NOISE, + HK_TYPE_IO_QUEUE, HK_TYPE_MAX, /* diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index ef152d401fe2..3406e3024fd4 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -16,6 +16,7 @@ enum hk_flags { HK_FLAG_DOMAIN = BIT(HK_TYPE_DOMAIN), HK_FLAG_MANAGED_IRQ = BIT(HK_TYPE_MANAGED_IRQ), HK_FLAG_KERNEL_NOISE = BIT(HK_TYPE_KERNEL_NOISE), + HK_FLAG_IO_QUEUE = BIT(HK_TYPE_IO_QUEUE), }; DEFINE_STATIC_KEY_FALSE(housekeeping_overridden); @@ -340,6 +341,12 @@ static int __init housekeeping_isolcpus_setup(char *str) continue; } + if (!strncmp(str, "io_queue,", 9)) { + str += 9; + flags |= HK_FLAG_IO_QUEUE; + continue; + } + /* * Skip unknown sub-parameter and validate that it is not * containing an invalid character. -- 2.51.0