linux-kernel - Re: [PATCH v2 1/3] blk-mq: add blk_mq_num_possible

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Date: Fri, 28 Jun 2024 08:23:57 +0200
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <dwagner@...e.de>, Jens Axboe <axboe@...nel.dk>,
 Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
 Thomas Gleixner <tglx@...utronix.de>, Christoph Hellwig <hch@....de>
Cc: Frederic Weisbecker <fweisbecker@...e.com>, Mel Gorman <mgorman@...e.de>,
 Sridhar Balaraman <sbalaraman@...allelwireless.com>,
 "brookxu.cn" <brookxu.cn@...il.com>, Ming Lei <ming.lei@...hat.com>,
 linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
 linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] blk-mq: add blk_mq_num_possible_queues helper

On 6/27/24 16:10, Daniel Wagner wrote:
> Multi queue devices which use managed IRQs should only allocate queues
> for the housekeeping CPUs when isolcpus is set. This avoids that the
> isolated CPUs get disturbed with OS workload.
> 
> Add a helper which calculates the correct number of queues which should
> be used.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   block/blk-mq-cpumap.c  | 20 ++++++++++++++++++++
>   include/linux/blk-mq.h |  1 +
>   2 files changed, 21 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

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