linux-kernel - Re: [PATCH] blk-ioprio: Introduce promote-to-rt policy

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Date:   Tue, 14 Feb 2023 09:52:36 +0100
From:   Jan Kara <jack@...e.cz>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Hou Tao <houtao@...weicloud.com>, Jan Kara <jack@...e.cz>,
        linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        cgroups@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, houtao1@...wei.com
Subject: Re: [PATCH] blk-ioprio: Introduce promote-to-rt policy

On Mon 13-02-23 09:10:26, Bart Van Assche wrote:
> On 2/13/23 04:51, Hou Tao wrote:
> > Should I keep "none-to-rt" and make it work just like "promote-to-rt" or should
> > I just remove "none-to-rt" and add "promote-to-rt" ? I think the latter will be
> > more appropriate.
> 
> Removing none-to-rt would break existing systems that use this policy. I
> prefer the former solution.

Agreed. I also think that keeping none-to-rt as an alias for promote-to-rt
allows for a smoother transition. However I'm all for documenting that
none-to-rt is deprecated and works as promote-to-rt.

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR