Re: [TECH TOPIC] io_uring: BPF controlled I/O

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

On 6/25/21 7:24 PM, Pavel Begunkov wrote:

Please ignore this:

My apologies, looks I screwed it and misread instructions.
Please
ignore this submission.

> io_uring is an asynchronous I/O API crafted for efficiency, where one of
> the reasons for using shared rings is to reduce context switching. It got
> lots of of features since introduction, and pushing it further we want
> to give away some of the control over submitting and controlling I/O to
> BPF, minimising the number of context switches even more.
> 
> - It should keep the number of system calls to a minimum.
> - Help to lower overhead on scheduling user processes to CPUs
>   when they have not much to do and will go to sleep briefly.
> - Be an alternative to submission queue polling for latency
>   reduction not taking as much CPU time at the same moment.
> 
> We'll go over the current design [1] and decisions, issues and plans,
> and hopefully it will engage a discussion and give impetus to curious
> minds to try it out and share ideas on how to tailor the API to fit
> their use cases.
> 
> [1] https://lore.kernel.org/io-uring/a83f147b-ea9d-e693-a2e9-c6ce16659749@gmail.com/T/#m31d0a2ac6e2213f912a200f5e8d88bd74f81406b
> 

-- 
Pavel Begunkov