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[Qemu-devel] [PATCH v6 00/14] Add support for io_uring
From: |
Aarushi Mehta |
Subject: |
[Qemu-devel] [PATCH v6 00/14] Add support for io_uring |
Date: |
Fri, 19 Jul 2019 19:05:16 +0530 |
This patch series adds support for the newly developed io_uring Linux AIO
interface. Linux io_uring is faster than Linux's AIO asynchronous I/O code,
offers efficient buffered asynchronous I/O support, the ability to do I/O
without performing a system call via polled I/O, and other efficiency
enhancements.
Testing it requires a host kernel (5.1+) and the liburing library.
Use the option -drive aio=io_uring to enable it.
Benchmarks for the system at https://github.com/rooshm/benchmarks
io_uring has similar performance as libaio but supports cache=writeback.
Further performance enhancement will be implemented
There is currently an -EIO output when guests are booted from io_uring
disks for the second time with clean shutdowns that is being investigated.
v6:
- add slow path for short-read
- hooks up fsync
- enables qemu-iotests with aio options
- adds bdrv_parse_aio
v5:
- Adds completion polling
- Extends qemu-io
- Adds qemu-iotest
v4:
- Add error handling
- Add trace events
- Remove aio submission based code
Aarushi Mehta (14):
configure: permit use of io_uring
qapi/block-core: add option for io_uring
block/block: add BDRV flag for io_uring
block/io_uring: implements interfaces for io_uring
stubs: add stubs for io_uring interface
util/async: add aio interfaces for io_uring
blockdev: accept io_uring as option
block/file-posix.c: extend to use io_uring
block: add trace events for io_uring
block/io_uring: adds userspace completion polling
qemu-io: adds option to use aio engine
qemu-img: adds option to use aio engine
qemu-nbd: adds option for aio engines
tests/qemu-iotest: enable testing with qemu-io aio options
MAINTAINERS | 8 +
block.c | 22 ++
block/Makefile.objs | 3 +
block/file-posix.c | 99 ++++++--
block/io_uring.c | 439 +++++++++++++++++++++++++++++++++++
block/trace-events | 12 +
blockdev.c | 12 +-
configure | 27 +++
include/block/aio.h | 16 +-
include/block/block.h | 2 +
include/block/raw-aio.h | 12 +
qapi/block-core.json | 4 +-
qemu-img.c | 11 +-
qemu-io.c | 25 +-
qemu-nbd.c | 12 +-
stubs/Makefile.objs | 1 +
stubs/io_uring.c | 32 +++
tests/qemu-iotests/check | 14 +-
tests/qemu-iotests/common.rc | 10 +
util/async.c | 36 +++
20 files changed, 746 insertions(+), 51 deletions(-)
create mode 100644 block/io_uring.c
create mode 100644 stubs/io_uring.c
--
2.21.0
- [Qemu-devel] [PATCH v6 00/14] Add support for io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 00/14] Add support for io_uring,
Aarushi Mehta <=
- [Qemu-devel] [PATCH v6 01/14] configure: permit use of io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 02/14] qapi/block-core: add option for io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 03/14] block/block: add BDRV flag for io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 04/14] block/io_uring: implements interfaces for io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 05/14] stubs: add stubs for io_uring interface, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 06/14] util/async: add aio interfaces for io_uring, Aarushi Mehta, 2019/07/19
- [Qemu-devel] [PATCH v6 07/14] blockdev: accept io_uring as option, Aarushi Mehta, 2019/07/19