Re: [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Sat, 30 Aug 2025 20:35:44 -0400
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Hannes Reinecke <hare@xxxxxxx>, Yu Kuai <yukuai3@xxxxxxxxxx>
In-reply-to: <20250830021825.2859325-1-ming.lei@redhat.com> (Ming Lei's message of "Sat, 30 Aug 2025 10:18:18 +0800")
Organization: Oracle Corporation
References: <20250830021825.2859325-1-ming.lei@redhat.com>

Ming,

> Replace the spinlock in blk_mq_find_and_get_req() with an SRCU read
> lock around the tag iterators.
>
> Avoids scsi_host_busy() lockup during scsi host blocked in case of big
> cpu cores & deep queue depth.

Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>

-- 
Martin K. Petersen

References:
- [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators
  - From: Ming Lei

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