From: Jens Axboe <axboe@kernel.dk>
To: Naohiro Aota <naohiro.aota@wdc.com>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@lst.de>,
Niklas Cassel <Niklas.Cassel@wdc.com>
Subject: Re: [PATCH v2] block: schedule queue restart after BLK_STS_ZONE_RESOURCE
Date: Tue, 26 Oct 2021 16:00:56 -0600 [thread overview]
Message-ID: <163528565626.259196.4840508461738349119.b4-ty@kernel.dk> (raw)
In-Reply-To: <20211026165127.4151055-1-naohiro.aota@wdc.com>
On Wed, 27 Oct 2021 01:51:27 +0900, Naohiro Aota wrote:
> When dispatching a zone append write request to a SCSI zoned block device,
> if the target zone of the request is already locked, the device driver will
> return BLK_STS_ZONE_RESOURCE and the request will be pushed back to the
> hctx dipatch queue. The queue will be marked as RESTART in
> dd_finish_request() and restarted in __blk_mq_free_request(). However, this
> restart applies to the hctx of the completed request. If the requeued
> request is on a different hctx, dispatch will no be retried until another
> request is submitted or the next periodic queue run triggers, leading to up
> to 30 seconds latency for the requeued request.
>
> [...]
Applied, thanks!
[1/1] block: schedule queue restart after BLK_STS_ZONE_RESOURCE
commit: 9586e67b911c95ba158fcc247b230e9c2d718623
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2021-10-26 22:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 16:51 [PATCH v2] block: schedule queue restart after BLK_STS_ZONE_RESOURCE Naohiro Aota
2021-10-26 22:00 ` Jens Axboe [this message]
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