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From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org
Cc: 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: Mon, 8 Sep 2025 09:28:59 +0800	[thread overview]
Message-ID: <aL4xW_wRG2MZFA3U@fedora> (raw)
In-Reply-To: <20250830021825.2859325-1-ming.lei@redhat.com>

On Sat, Aug 30, 2025 at 10:18:18AM +0800, Ming Lei wrote:
> Hello Jens,
> 
> 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.
> 
> Also the big tags lock isn't needed when reading disk sysfs attribute
> 'inflight' any more.
> 
> Take the following approach:
> 
> - clearing rq reference in tags->rqs[] and deferring freeing scheduler requests
> in SRCU callback
> 
> - replace tags->lock with srcu read lock in tags iterator.
> 
> V2:
> 	- rebase on for-6.18/block
> 	- add review tags

Hello Jens,

Ping...

Thanks,
Ming


  parent reply	other threads:[~2025-09-08  1:29 UTC|newest]

Thread overview: 13+ 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
2025-10-04 14:42     ` Ming Lei
2025-10-06 18:02       ` Bart Van Assche
2025-10-06 23:03         ` Jens Axboe
2025-08-31  0:35 ` [PATCH V2 0/5] blk-mq: Replace tags->lock with SRCU for tag iterators Martin K. Petersen
2025-09-08  1:28 ` Ming Lei [this message]
2025-09-08 14:07 ` Jens Axboe

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