Re: [PATCH v4 3/9] blk-mq: add number of queue calc helper

Hannes Reinecke
2025-01-10T09:23:25Z

On 12/17/24 19:29, Daniel Wagner wrote:
> Multiqueue devices should only allocate queues for the housekeeping CPUs
> when isolcpus=managed_irq is set. This avoids that the isolated CPUs get
> disturbed with OS workload.
>
> Add two variants of helpers which calculates the correct number of
> queues which should be used. The need for two variants is necessary
> because some drivers calculate their max number of queues based on the
> possible CPU mask, others based on the online CPU mask.
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Daniel Wagner <wagi@kernel.org>
> ---
> block/blk-mq-cpumap.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/blk-mq.h | 2 ++
> 2 files changed, 47 insertions(+)
>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
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