linux-kernel - Re: [PATCH RFC v2 0/7] blk-iocost: support to build iocost as kernel module

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Date: Tue, 18 Jun 2024 00:12:39 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: axboe@...nel.dk, tj@...nel.org, gregkh@...uxfoundation.org,
	bvanassche@....org, hch@...radead.org, josef@...icpanda.com,
	lizefan.x@...edance.com, hannes@...xchg.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, yukuai3@...wei.com, yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: Re: [PATCH RFC v2 0/7] blk-iocost: support to build iocost as kernel
 module

On Tue, Jun 18, 2024 at 11:17:44AM +0800, Yu Kuai wrote:
> The motivation is that iocost is not used widely in our production, and
> some customers don't want to increase kernel size to enable iocost that
> they will never use, and it'll be painful to maintain a new downstream
> kernel. Hence it'll be beneficially to build iocost as kernel module:
> 
> - Kernel Size and Resource Usage, modules are loaded only when their
> specific functionality is required.
> 
> - Flexibility and Maintainability, allows for dynamic loading and unloading
> of modules at runtime without the need to recompile and restart the kernel,
> for example we can just replace blk-iocost.ko to fix iocost CVE in our
> production environment.

Given the amount of new exports and infrastructure it adds this still
feels like a bad tradeoff.