From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Aaron Tomlin <atomlin@atomlin.com>
Cc: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me,
mst@redhat.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, yphbchou0911@gmail.com,
wagi@kernel.org, frederic@kernel.org, longman@redhat.com,
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ming.lei@redhat.com, steve@abita.co, sean@ashe.io,
chjohnst@gmail.com, neelx@suse.com, mproche@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: Re: [PATCH v9 09/13] isolation: Introduce io_queue isolcpus type
Date: Wed, 1 Apr 2026 14:49:47 +0200 [thread overview]
Message-ID: <20260401124947.-d4D5Cr-@linutronix.de> (raw)
In-Reply-To: <20260330221047.630206-10-atomlin@atomlin.com>
On 2026-03-30 18:10:43 [-0400], Aaron Tomlin wrote:
> 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
I set down and documented the behaviour of managed_irq at
https://lore.kernel.org/all/20260401110232.ET5RxZfl@linutronix.de/
Could we please clarify whether we want to keep it and this
additionally or if managed_irq could be used instead. This adds another
bit. If networking folks jump in on managed_irqs, would they need to
duplicate this with their net sub flag?
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Aaron Tomlin <atomlin@atomlin.com>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>
Sebastian
next prev parent reply other threads:[~2026-04-01 12:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-30 22:10 [PATCH v9 00/13] blk: honor isolcpus configuration Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 01/13] scsi: aacraid: use block layer helpers to calculate num of queues Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 02/13] lib/group_cpus: remove dead !SMP code Aaron Tomlin
2026-04-01 12:29 ` Sebastian Andrzej Siewior
2026-04-01 19:31 ` Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 03/13] lib/group_cpus: Add group_mask_cpus_evenly() Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 04/13] genirq/affinity: Add cpumask to struct irq_affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 05/13] blk-mq: add blk_mq_{online|possible}_queue_affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 06/13] nvme-pci: use block layer helpers to constrain queue affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 07/13] scsi: Use " Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 08/13] virtio: blk/scsi: use " Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 09/13] isolation: Introduce io_queue isolcpus type Aaron Tomlin
2026-04-01 12:49 ` Sebastian Andrzej Siewior [this message]
2026-04-01 19:05 ` Waiman Long
2026-04-02 7:58 ` Sebastian Andrzej Siewior
2026-04-03 1:54 ` Waiman Long
2026-04-01 20:58 ` Aaron Tomlin
2026-04-02 9:09 ` Sebastian Andrzej Siewior
2026-04-03 0:50 ` Aaron Tomlin
2026-04-03 1:20 ` Ming Lei
2026-03-30 22:10 ` [PATCH v9 10/13] blk-mq: use hk cpus only when isolcpus=io_queue is enabled Aaron Tomlin
2026-03-31 23:05 ` Keith Busch
2026-04-01 17:16 ` Aaron Tomlin
2026-04-03 1:43 ` Ming Lei
2026-03-30 22:10 ` [PATCH v9 11/13] blk-mq: prevent offlining hk CPUs with associated online isolated CPUs Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 12/13] genirq/affinity: Restrict managed IRQ affinity to housekeeping CPUs Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 13/13] docs: add io_queue flag to isolcpus Aaron Tomlin
2026-03-31 1:01 ` [PATCH v9 00/13] blk: honor isolcpus configuration Ming Lei
2026-03-31 13:38 ` Aaron Tomlin
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