linux-kernel - Re: [PATCH v4 0/5] Fix I/O priority lost in device-mapper

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Date:   Tue, 12 Dec 2023 20:45:30 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Hongyu Jin <hongyu.jin.cn@...il.com>
Cc:     agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com,
        axboe@...nel.dk, zhiguo.niu@...soc.com, ke.wang@...soc.com,
        yibin.ding@...soc.com, hongyu.jin@...soc.com,
        linux-kernel@...r.kernel.org, dm-devel@...ts.linux.dev,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v4 0/5] Fix I/O priority lost in device-mapper

On Tue, Dec 12, 2023 at 07:11:45PM +0800, Hongyu Jin wrote:
> From: Hongyu Jin <hongyu.jin@...soc.com>
> 
> A high-priority task obtains data from the dm-verity device using the
> RT IO priority, during the verification, the IO reading FEC and hash
> by kworker loses the RT priority and is blocked by the low-priority IO.
> dm-crypt has the same problem in the process of writing data.
> 
> This is because io_context and blkcg are missing.
> 
> Move bio_set_ioprio() into submit_bio():
> 1. Only call bio_set_ioprio() once to set the priority of original bio,
>    the bio that cloned and splited from original bio will auto inherit
>    the priority of original bio in clone process.
> 
> 2. Make the IO priority of the original bio to be passed to dm,
>    and the dm target inherits the IO priority as needed.
> 

What commit does this patch series apply to?

- Eric