Features/IOUring: Difference between revisions

Latest revision as of 18:17, 23 May 2019

io_uring is a Linux API for asynchronous I/O. It is designed for higher performance than the older Linux AIO API that QEMU supports.

Aarushi Mehta is implementing io_uring support in QEMU as part of the Outreachy internship program.

Code

Aarushi's git repo: https://github.com/rooshm/qemu/tree/io_uring

Plan

Task/Week	1	2	3	4	5	6	7	8	9	10	11	12
1 - Extend block/file-posix.c to use io_uring.	x	x	x
2 - Add polling mode support for completions.				x	x	x
3 - Add support to register file descriptors.						x
4 - Add polling mode support for submissions.						x	x
5 - Add support to register memory buffers.							x	x
6 - Add a fast path when QEMU block layer features are not in use .									x	x	x
7 - Complete reporting of all benchmarking with io_uring.												x

Status

Early development. Not yet ready for testing.

How to use it

io_uring is an alternative AIO engine in QEMU. Instead of specifying -drive aio=threads or -drive aio=native, use -drive aio=io_uring.

Details

Aarushi Mehta <mehta.aaru20@gmail.com> ("roosh" on IRC)
Mentors: Julia Suvorova <jusual@mail.ru> ("jusual" on IRC), Stefan Hajnoczi <stefanha@redhat.com> ("stefanha" on IRC)

@@ Line 3: / Line 3: @@
 Aarushi Mehta is implementing io_uring support in QEMU as part of the Outreachy internship program.
-=Code=
+==Code==
-* Aarushi's git repo: https://github.com/weatherwaxed/qemu/tree/mirroraio
+* Aarushi's git repo: https://github.com/rooshm/qemu/tree/io_uring
-=Status=
+==Plan==
+{|class="wikitable" style="font-size: small; text-align: center; table-layout: fixed;"
+! Task/Week
+! 1
+! 2
+! 3
+! 4
+! 5
+! 6
+! 7
+! 8
+! 9
+! 10
+! 11
+! 12
+|-
+| '''1 - Extend block/file-posix.c to use io_uring.'''
+| x
+| x
+| x
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|-
+| '''2 -  Add polling mode support for completions.'''
+|
+|
+|
+| x
+| x
+| x
+|
+|
+|
+|
+|
+|
+|-
+| '''3 - Add support to register file descriptors.'''
+|
+|
+|
+|
+|
+| x
+|
+|
+|
+|
+|
+|
+|-
+| '''4 - Add polling mode support for submissions.'''
+|
+|
+|
+|
+|
+| x
+| x
+|
+|
+|
+|
+|
+|-
+| '''5 - Add support to register memory buffers.'''
+|
+|
+|
+|
+|
+|
+| x
+| x
+|
+|
+|
+|
+|-
+| '''6 - Add  a fast path when QEMU block layer features are not in use .'''
+|
+|
+|
+|
+|
+|
+|
+|
+| x
+| x
+| x
+|
+|-
+| '''7 - Complete reporting of all benchmarking with io_uring.'''
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+| x
+|-
+|}
+==Status==
 Early development.  Not yet ready for testing.
-=How to use it=
+==How to use it==
 io_uring is an alternative AIO engine in QEMU.  Instead of specifying <code>-drive aio=threads</code> or <code>-drive aio=native</code>, use <code>-drive aio=io_uring</code>.
+==Details==
+* Aarushi Mehta <mehta.aaru20@gmail.com> ("roosh" on IRC)
+* Mentors: Julia Suvorova <jusual@mail.ru> ("jusual" on IRC), Stefan Hajnoczi <stefanha@redhat.com> ("stefanha" on IRC)
 [[Category:GSoC Project]]