linux-kernel - Re: [PATCH v2 3/3] blk-ioprio: remove per-disk structure

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Message-ID: <38a63742-99de-47c2-a91d-ede30a4ccd8b@acm.org>
Date: Fri, 19 Jul 2024 09:26:27 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yu Kuai <yukuai1@...weicloud.com>, jack@...e.cz, hch@...radead.org,
 tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk
Cc: cgroups@...r.kernel.org, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, yukuai3@...wei.com, yi.zhang@...wei.com,
 yangerkun@...wei.com
Subject: Re: [PATCH v2 3/3] blk-ioprio: remove per-disk structure

On 7/18/24 7:34 PM, Yu Kuai wrote:
> ioprio works on the blk-cgroup level, all disks in the same cgroup
> are the same, and the struct ioprio_blkg doesn't have anything in it.
> Hence register the policy is enough, because cpd_alloc/free_fn will
> be handled for each blk-cgroup, and there is no need to activate the
> policy for disk. Hence remove blk_ioprio_init/exit and
> ioprio_alloc/free_pd.

Reviewed-by: Bart Van Assche <bvanassche@....org>