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

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On 6/12/24 10:54 PM, Greg KH wrote:
On Thu, Jun 13, 2024 at 09:49:30AM +0800, Yu Kuai wrote:
From: Yu Kuai <yukuai3@xxxxxxxxxx>

Yu Kuai (7):
   kernfs: export pr_cont_kernfs_path()
   cgroup: export cgroup_parse_float
   block: export some API
   blk-iocost: factor out helpers to handle params from ioc_qos_write()
   blk-iocost: parse params before initializing iocost
   blk-iocost: support to free iocost
   blk-iocost: support to build iocost as kernel module

No where do you say _why_ building this as a module is a good idea.

Why do this at all?

With CONFIG_BLK_CGROUP_IOCOST=y (as in the Android kernel), the
blk-iocost kernel module causes a (small) runtime overhead, even if it
is not being used.

Thanks,

Bart.





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