To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

How to transfigure the Wikipedia

Would you like Wikipedia to always look as professional and up-to-date? We have created a browser extension. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology.

Try it — you can delete it anytime.

Install in 5 seconds
4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Languages
Recent
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
Great Wikipedia has got greater.
.
Leo
Newton
Brights
Milds

io_uring

From Wikipedia, the free encyclopedia

io_uring (previously known as aioring) is a Linux kernel system call interface for storage device asynchronous I/O operations addressing performance issues with similar interfaces provided by functions like read()/write() or aio_read()/aio_write() etc. for operations on data accessed by file descriptors.[1][2]: 2 

Development is ongoing, worked on primarily by Jens Axboe at Meta.[1]

YouTube Encyclopedic

  • 1/3
    Views:
    432
    2 572
    14 235
  • Демо-занятие курса «Программист С»
  • The Fastest SQL Database Ever
  • Is Linux Better Than Windows

Transcription

Interface

It works by creating two circular buffers, called "queue rings", for storage of submission and completion of I/O requests, respectively. For storage devices, these are called the submission queue (SQ) and completion queue (CQ).[3] Keeping these buffers shared between the kernel and application helps to boost the I/O performance by eliminating the need to issue extra and expensive system calls to copy these buffers between the two.[1][3][4] According to the io_uring design paper, the SQ buffer is writable only by consumer applications, and the CQ buffer is writable only by the kernel.[1]: 3 

eBPF can be combined with io_uring.[5]

History

The Linux kernel has supported asynchronous I/O since version 2.5, but it was seen as difficult to use and inefficient.[6] This older API only supported certain niche use cases,[7] notably it only enables asynchronous operation when using the O_DIRECT flag and while accessing already allocated files. This prevents utilizing the page cache, while also exposing the application to complex O_DIRECT semantics. Linux AIO also does not support sockets, so it cannot be used to multiplex network and disk I/O.[8]

The io_uring kernel interface was adopted in Linux kernel version 5.1 to resolve the deficiencies of Linux AIO.[1][4][9] The liburing library provides an API to interact with the kernel interface easily from userspace.[1][1]: 12 

Security

io_uring has been noted for exposing a significant attack surface and structural difficulties integrating it with the Linux security subsystem.[10]

In June 2023, Google's security team reported that 60% of Linux kernel exploits submitted to their bug bounty program in 2022 were exploits of io_uring vulnerabilities. As a result, io_uring was disabled for apps in Android, and disabled entirely in ChromeOS as well as Google servers.[11] Docker also consequently disabled io_uring from their default seccomp profile.[12]

References

  1. ^ a b c d e f g "Linux Kernel Getting io_uring To Deliver Fast & Efficient I/O - Phoronix". Phoronix. Retrieved 2021-03-14.
  2. ^ Axboe, Jens (October 15, 2019). "Efficient IO with io_uring" (PDF).
  3. ^ a b "Getting Hands-on with io_uring using Go". developers.mattermost.com. Retrieved 2021-11-20.
  4. ^ a b "The rapid growth of io_uring [LWN.net]". lwn.net. Retrieved 2021-11-20.
  5. ^ "BPF meets io_uring [LWN.net]". LWN.net. Retrieved 2023-04-17.
  6. ^ Corbet, Jonathan. "Ringing in a new asynchronous I/O API". LWN.net. Retrieved 2021-03-14.
  7. ^ "What's new with io_uring" (PDF). Retrieved 2022-06-01.
  8. ^ "Linux Asynchronous I/O". 2014-04-21. Archived from the original on 2015-04-06. Retrieved 2023-06-16. Blocking during io_submit on ext4, on buffered operations, network access, pipes, etc. Some operations are not well-represented by the AIO interface. With completely unsupported operations like buffered reads, operations on a socket or pipes, the entire operation will be performed during the io_submit syscall, with the completion available immediately for access with io_getevents. AIO access to a file on a filesystem like ext4 is partially supported: if a metadata read is required to look up the data block (ie if the metadata is not already in memory), then the io_submit call will block on the metadata read. Certain types of file-enlarging writes are completely unsupported and block for the entire duration of the operation.
  9. ^ "Faster IO through io_uring | Kernel Recipes 2019". Retrieved 2021-03-14.
  10. ^ Corbet, Jonathan (2022-07-28). "Security requirements for new kernel features". LWN.net. Retrieved 2023-06-16.
  11. ^ Koczka, Tamás. "Learnings from kCTF VRP's 42 Linux kernel exploits submissions". Google Online Security Blog. Google. Retrieved 14 June 2023.
  12. ^ "seccomp: block io_uring_* syscalls in default profile by akerouanton · Pull Request #46762 · moby/moby". GitHub. Retrieved 2023-11-02.

External links

This page was last edited on 23 November 2023, at 12:00
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.
Contact WIKI 2
Introduction
Terms of Service
Privacy Policy