From: Aaron Tomlin <atomlin@atomlin•com>
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, 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 v12 09/13] isolation: Introduce io_queue isolcpus type
Date: Wed, 22 Apr 2026 14:52:11 -0400 [thread overview]
Message-ID: <20260422185215.100929-10-atomlin@atomlin.com> (raw)
In-Reply-To: <20260422185215.100929-1-atomlin@atomlin.com>
From: Daniel Wagner <wagi@kernel•org>
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 <wagi@kernel•org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle•com>
Reviewed-by: Hannes Reinecke <hare@suse•de>
Signed-off-by: Aaron Tomlin <atomlin@atomlin•com>
---
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
next prev parent reply other threads:[~2026-04-22 18:53 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-22 18:52 [PATCH v12 00/13] blk: honor isolcpus configuration Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 01/13] scsi: aacraid: use block layer helpers to calculate num of queues Aaron Tomlin
2026-05-05 18:42 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 02/13] lib/group_cpus: remove dead !SMP code Aaron Tomlin
2026-04-27 15:21 ` Sebastian Andrzej Siewior
2026-04-29 23:32 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 03/13] lib/group_cpus: Add group_mask_cpus_evenly() Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 04/13] genirq/affinity: Add cpumask to struct irq_affinity Aaron Tomlin
2026-05-05 20:40 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 05/13] blk-mq: add blk_mq_{online|possible}_queue_affinity Aaron Tomlin
2026-04-27 15:34 ` Sebastian Andrzej Siewior
2026-04-28 12:53 ` Daniel Wagner
2026-04-29 7:15 ` Hannes Reinecke
2026-05-05 20:55 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 06/13] nvme-pci: use block layer helpers to constrain queue affinity Aaron Tomlin
2026-05-05 19:47 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 07/13] scsi: Use " Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 08/13] virtio: blk/scsi: use " Aaron Tomlin
2026-04-22 18:52 ` Aaron Tomlin [this message]
2026-04-22 18:52 ` [PATCH v12 10/13] blk-mq: use hk cpus only when isolcpus=io_queue is enabled Aaron Tomlin
2026-05-02 21:25 ` Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 11/13] blk-mq: prevent offlining hk CPUs with associated online isolated CPUs Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 12/13] genirq/affinity: Restrict managed IRQ affinity to housekeeping CPUs Aaron Tomlin
2026-04-22 18:52 ` [PATCH v12 13/13] docs: add io_queue flag to isolcpus Aaron Tomlin
2026-04-27 10:55 ` [PATCH v12 00/13] blk: honor isolcpus configuration Florian Bezdeka
2026-04-28 13:08 ` Daniel Wagner
2026-04-29 21:01 ` Florian Bezdeka
2026-04-30 12:09 ` Daniel Wagner
2026-04-30 15:45 ` Jan Kiszka
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