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

[Hannes Reinecke]

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@xxxxxx>
> Signed-off-by: Daniel Wagner <wagi@xxxxxxxxxx>
> ---
>   block/blk-mq-cpumap.c  | 45 +++++++++++++++++++++++++++++++++++++++++++++
>   include/linux/blk-mq.h |  2 ++
>   2 files changed, 47 insertions(+)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@xxxxxxx                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich