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* [TECH TOPIC] io_uring: BPF controlled I/O
@ 2021-06-25 18:24 Pavel Begunkov
  2021-06-25 18:28 ` Pavel Begunkov
  0 siblings, 1 reply; 2+ messages in thread
From: Pavel Begunkov @ 2021-06-25 18:24 UTC (permalink / raw)
  To: ksummit

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

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2021-06-25 18:24 [TECH TOPIC] io_uring: BPF controlled I/O Pavel Begunkov
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