From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Hannes Reinecke <hare@suse.de>,
Yu Kuai <yukuai3@huawei.com>
Subject: Re: [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators
Date: Sat, 30 Aug 2025 20:35:44 -0400 [thread overview]
Message-ID: <yq1v7m4gwfi.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <20250830021825.2859325-1-ming.lei@redhat.com> (Ming Lei's message of "Sat, 30 Aug 2025 10:18:18 +0800")
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@oracle.com>
--
Martin K. Petersen
next prev parent reply other threads:[~2025-08-31 0:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-30 2:18 [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators Ming Lei
2025-08-30 2:18 ` [PATCH V2 1/5] blk-mq: Move flush queue allocation into blk_mq_init_hctx() Ming Lei
2025-08-30 2:18 ` [PATCH V2 2/5] blk-mq: Pass tag_set to blk_mq_free_rq_map/tags Ming Lei
2025-08-30 2:18 ` [PATCH V2 3/5] blk-mq: Defer freeing of tags page_list to SRCU callback Ming Lei
2025-08-30 2:18 ` [PATCH V2 4/5] blk-mq: Defer freeing flush queue " Ming Lei
2025-08-30 2:18 ` [PATCH V2 5/5] blk-mq: Replace tags->lock with SRCU for tag iterators Ming Lei
2025-10-03 17:17 ` [PATCH V2 5/5] blk-mq: Replace tags->lock with SRCU for tag iterators - Rockchip UFS regression Sebastian Reichel
2025-10-03 17:17 ` Sebastian Reichel
2025-10-04 14:42 ` Ming Lei
2025-10-04 14:42 ` Ming Lei
2025-10-06 18:02 ` Bart Van Assche
2025-10-06 18:02 ` Bart Van Assche
2025-10-06 23:03 ` Jens Axboe
2025-10-06 23:03 ` Jens Axboe
2025-08-31 0:35 ` Martin K. Petersen [this message]
2025-09-08 1:28 ` [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators Ming Lei
2025-09-08 14:07 ` Jens Axboe
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