linux-kernel - Re: [PATCH v3] block: flush all throttled bios when deleting the cgroup

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Message-ID: <ZsTNLor7XoJ9dOVx@slm.duckdns.org>
Date: Tue, 20 Aug 2024 07:06:54 -1000
From: Tejun Heo <tj@...nel.org>
To: Li Lingfeng <lilingfeng@...weicloud.com>
Cc: josef@...icpanda.com, hch@....de, mkoutny@...e.com, axboe@...nel.dk,
	cgroups@...r.kernel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, yukuai1@...weicloud.com,
	houtao1@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
	yukuai3@...wei.com, lilingfeng3@...wei.com
Subject: Re: [PATCH v3] block: flush all throttled bios when deleting the
 cgroup

On Sat, Aug 17, 2024 at 03:11:08PM +0800, Li Lingfeng wrote:
> From: Li Lingfeng <lilingfeng3@...wei.com>
> 
> When a process migrates to another cgroup and the original cgroup is deleted,
> the restrictions of throttled bios cannot be removed. If the restrictions
> are set too low, it will take a long time to complete these bios.
> 
> Refer to the process of deleting a disk to remove the restrictions and
> issue bios when deleting the cgroup.
> 
> This makes difference on the behavior of throttled bios:
> Before: the limit of the throttled bios can't be changed and the bios will
> complete under this limit;
> Now: the limit will be canceled and the throttled bios will be flushed
> immediately.
> 
> References:
> [1] https://lore.kernel.org/r/20220318130144.1066064-4-ming.lei@redhat.com
> [2] https://lore.kernel.org/all/da861d63-58c6-3ca0-2535-9089993e9e28@huaweicloud.com/
> 
> Signed-off-by: Li Lingfeng <lilingfeng3@...wei.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun