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.
v5:
- Adds completion polling
- Extends qemu-io
- Adds qemu-iotest
v4:
- Add error handling
- Add trace events
- Remove aio submission based code
v3:
- Fix major errors in io_uring (sorry)
- Option now enumerates for CONFIG_LINUX_IO_URING
- pkg config support added
Aarushi Mehta (12):
configure: permit use of io_uring
qapi/block-core: add option for io_uring Only enumerates option for
devices that support it
block/block: add BDRV flag for io_uring
block/io_uring: implements interfaces for io_uring Aborts when sqe
fails to be set as sqes cannot be returned to the ring.
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 support for io_uring
qemu-iotests/087: checks for io_uring
MAINTAINERS | 8 +
block/Makefile.objs | 3 +
block/file-posix.c | 85 ++++++++--
block/io_uring.c | 339 +++++++++++++++++++++++++++++++++++++
block/trace-events | 8 +
blockdev.c | 4 +-
configure | 27 +++
include/block/aio.h | 16 +-
include/block/block.h | 1 +
include/block/raw-aio.h | 12 ++
qapi/block-core.json | 4 +-
qemu-io.c | 13 ++
stubs/Makefile.objs | 1 +
stubs/io_uring.c | 32 ++++
tests/qemu-iotests/087 | 26 +++
tests/qemu-iotests/087.out | 10 ++
util/async.c | 36 ++++
17 files changed, 606 insertions(+), 19 deletions(-)
create mode 100644 block/io_uring.c
create mode 100644 stubs/io_uring.c
--
2.17.1
