From: Daniel Wagner <wagi@monom.org>
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,
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nick.lange@gmail.com, marco.crivellari@suse.com,
rishil1999@outlook.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v13 5/8] blk-mq: use hk cpus only when isolcpus=io_queue is enabled
Date: Wed, 13 May 2026 11:42:46 +0200 [thread overview]
Message-ID: <3af2cd18-1221-4ff6-aa7f-6dab74460eab@nitrogen.local> (raw)
In-Reply-To: <20260513005509.135966-6-atomlin@atomlin.com>
On Tue, May 12, 2026 at 08:55:06PM -0400, Aaron Tomlin wrote:
> +static void blk_mq_map_fallback(struct blk_mq_queue_map *qmap)
> +{
> + unsigned int cpu;
> +
> + /*
> + * Map all CPUs to the first hctx of this specific map to ensure
> + * at least one online CPU is serving it, respecting the map's
> + * boundaries so secondary maps do not route into the default map.
> + */
> + for_each_possible_cpu(cpu)
> + qmap->mq_map[cpu] = qmap->queue_offset;
> +}
I think this should also check if the CPU is online. The fallback should
ensure the system will boot.
next prev parent reply other threads:[~2026-05-16 17:33 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-13 0:55 [PATCH v13 0/8] blk: honor isolcpus configuration Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 1/8] scsi: aacraid: use block layer helpers to calculate num of queues Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 2/8] lib/group_cpus: remove dead !SMP code Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 3/8] lib/group_cpus: Add group_mask_cpus_evenly() Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 4/8] isolation: Introduce io_queue isolcpus type Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 5/8] blk-mq: use hk cpus only when isolcpus=io_queue is enabled Aaron Tomlin
2026-05-13 9:42 ` Daniel Wagner [this message]
2026-05-13 23:30 ` Aaron Tomlin
2026-05-14 10:42 ` Daniel Wagner
2026-05-19 2:50 ` Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 6/8] blk-mq: prevent offlining hk CPUs with associated online isolated CPUs Aaron Tomlin
2026-05-19 0:51 ` Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 7/8] genirq/affinity: Restrict managed IRQ affinity to housekeeping CPUs Aaron Tomlin
2026-05-13 0:55 ` [PATCH v13 8/8] docs: add io_queue flag to isolcpus Aaron Tomlin
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