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Thu, 16 Apr 2026 19:30:22 +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, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, megaraidlinux.pdl@broadcom.com, mpi3mr-linuxdrv.pdl@broadcom.com, MPT-FusionLinux.pdl@broadcom.com Subject: [PATCH v11 09/13] isolation: Introduce io_queue isolcpus type Date: Thu, 16 Apr 2026 15:29:38 -0400 Message-ID: <20260416192942.1243421-10-atomlin@atomlin.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260416192942.1243421-1-atomlin@atomlin.com> References: <20260416192942.1243421-1-atomlin@atomlin.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1P223CA0002.NAMP223.PROD.OUTLOOK.COM (2603:10b6:208:2c4::7) To CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:70::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB3523:EE_|CWXP123MB4039:EE_ X-MS-Office365-Filtering-Correlation-Id: 0c6ee339-2904-491a-1e0b-08de9bee99c5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|56012099003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?CsIRpKTBYiHYuSdKI6Rvs1W14HgUpgYGQuJM/uAMvdXzwPVoMic7j+FlMdIY?= =?us-ascii?Q?HO+5PHgSabwMJsv1r4drxpO4hxWAOO4G9+OSnyF9puAtwKb7LnAfp78guxp1?= =?us-ascii?Q?4a2sxbYTnG74gFo0BLxHhHzJkgYEIE6rnU9MLWeDAmJ2ih8EoIY6Md7OXi9T?= =?us-ascii?Q?sVrWY+X7D7FEP1qp8iLcbquN7QYIIzJVcC8ecOJa4KAwBDLhBSiuwcm8Ej5C?= =?us-ascii?Q?hL3ECOsBIgsgQo3BZtb4Kp1IKfF30GLfc3XXEYj9324Zjj75Dyixq6LTKnue?= =?us-ascii?Q?XAhdXZXvFnK8nwycmrWN/2ep9hEVQDbMSxmB7UXeCSANim1MQs54I3qpOMGW?= =?us-ascii?Q?D/YjzcPKZi67LMZH1ICnmXTzgQj0smswSrxSvhtj4fonuXhwdpWAmfIRx1NC?= =?us-ascii?Q?Wy82LcE3p9te3D5oVxb29uwnH2dCt77MQtylUTjZVbNnKBSEXqxD4jM1FZ/f?= =?us-ascii?Q?7BOfBLNZsDcE/fCXd3Ofw9lUdQY95C4ewFD5Sah4pbeDIoMStlMOo96tXeUP?= =?us-ascii?Q?qXhd+Aj5CEWIx8vsebxbpSBRH+FLpV8uO6/HGjd+TkfXFWHA73v3JD6QUOYB?= =?us-ascii?Q?XksPnMPf/lgX3cr10mZyo9HbVpv542HLd3pYFG4jgp/Icbr/4yfvtZjNQpip?= =?us-ascii?Q?gnlhtggIjV8W3wsgISWGCl69PSZsDwy7UT6ds6fRxMZ5zXyZVcwmZTfgpRdH?= =?us-ascii?Q?NMa+VoYRidinCZz+zH95CwXdSOvmd4kLiLq8XnclfK/iZi8+giGIsst2PeOl?= =?us-ascii?Q?JayrfFP1RntAEM9hTQ5RZlSrkSt3jICMil7dYvUaYpnhWR5rFu+ur4JfiIdz?= =?us-ascii?Q?p73g9JRHnrZ4l2A6qShMoyI8oKtgFfhvCbV6qPuc6u2YA5cwUdT27byvWS49?= =?us-ascii?Q?WhfnfEIjXY3jruE+Xcdqlb/G414EQaG6z1OQ/F9DAH5+gas4vTyKuUjfp8+b?= =?us-ascii?Q?WPSe5PPvrxRosdHzdm5gAVVHe+ywL5H0Q0gtnyQk2zZq1ZcUH8XVWP4JIrSK?= =?us-ascii?Q?cDvuCEuIg75MgItTqIpnHYeGFfPbJyHN+bwflYVhnAuzh/7sx03yaPzZZDbs?= =?us-ascii?Q?ksRUQXuCTbJYizzSb6+PnLypZjKMAGzNGEsDaKbPLtfD/sLqqIGcEvJQOCcl?= =?us-ascii?Q?23pKnzcpGjZZSvtVmQEAo8Rudg2/cnlve/1Cda38MUezvq85hJUcEhHJYwD+?= =?us-ascii?Q?QnwHW06V7lallWkNoDubhlChoZEdf7hSYs5TFQeDBENj3rE7CFiaBbHgbU0k?= =?us-ascii?Q?4tVBTHr3bsXEeGyDQLXcWjyFuBS2UMzN1moU9KoB9cqlLgdwp7pLzKHgRA9G?= =?us-ascii?Q?nbC1oekkTGW3AmYzFmGttB3Fs09+wlv1ifZV0Ovq9lfZ384CyL6UPBrCdZMx?= =?us-ascii?Q?KQJ9ICSfiqEb0qkB3YM5ETEl+bL+ZKU0lzqUforQMkU4WZGN4Vlu9qoW8wk1?= =?us-ascii?Q?SVBRJlShYQ2UEl45YsagOH7TTNaF0bbJcLgsQpFKuPPFHIvnbpSX0Wk6fXkc?= =?us-ascii?Q?MjJ3kDZl3YWjPj6w/yu/I8faQKmwOWpoIhMXc0rQOhWoDn4ONBcul8EjgYyQ?= =?us-ascii?Q?N1K9reZWbNHt3xGDrGpe18NdaAaXXZxz7dejUoubbH039bab537oDzPQL4LN?= =?us-ascii?Q?CMxSJ07LVNxV+eMQSw9C+u2RFY0TiUMMQPKXTAD5rGRFDBycrwInKK0xXoRA?= =?us-ascii?Q?iY9HopiPMBZHb4CtYmsnVhMo8Hruiq4TQGSlHwBpEBP0sabKPo0aiORPk4pr?= =?us-ascii?Q?RBSpL8JAXA=3D=3D?= X-OriginatorOrg: atomlin.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0c6ee339-2904-491a-1e0b-08de9bee99c5 X-MS-Exchange-CrossTenant-AuthSource: CWLP123MB3523.GBRP123.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Apr 2026 19:30:21.9063 (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: wKE0zfYQsnejZ96odTD4FhIFXvu0RpAXlEi52p1BkAZlr44IrYZ+Vm89i07GvfYCmLgVYxXm/ivvVU+eq59sdw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CWXP123MB4039 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 dc3975ff1b2e..7b266fc2a405 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