Re: [PATCH 1/1] io_uring: delay sqarray static branch disablement

[Pavel Begunkov <asml.silence@gmail.com>]

On 2/15/26 21:48, Jens Axboe wrote:
> On 2/15/26 2:29 PM, Pavel Begunkov wrote:
>> io_key_has_sqarray static branch can be easily switched
>> on/off by the user. Prevent abuse and defer for a bit when it's
>> disabled.
> 
> Can we get something in here for the reason for why the change
> is being made? The commit message really doesn't explain any
> of this.

It appeared to be pretty self-explanatory, I can expand, but in
short you can spam with

while (1) {
	create_ring_with_sq_array();
	kill_ring();
}

and each iteration it'll be patching kernel code, and that
can be very disruptive for the entire system depending on arch
and how removal is synchronized.

-- 
Pavel Begunkov