aio-posix: integrate fdmon into glib event loop

[PATCH 0/4] aio-posix: integrate fdmon into glib event loop

Stefan Hajnoczi posted 4 patches 10 months, 2 weeks ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20250326183340.1010531-1-stefanha@redhat.com

Maintainers: Stefan Hajnoczi <stefanha@redhat.com>, Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Stefan Weil <sw@weilnetz.de>

meson.build                       |  2 +-
include/block/aio.h               | 39 ++++++++++++--
util/aio-posix.h                  |  5 ++
tests/unit/test-aio.c             |  7 ++-
tests/unit/test-nested-aio-poll.c | 13 ++---
util/aio-posix.c                  | 81 ++++++----------------------
util/aio-win32.c                  |  4 --
util/async.c                      |  1 -
util/fdmon-epoll.c                | 52 ++++++++++++++++--
util/fdmon-io_uring.c             | 78 ++++++++++++++++++++++-----
util/fdmon-poll.c                 | 88 ++++++++++++++++++++++++++++++-
11 files changed, 268 insertions(+), 102 deletions(-)

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[PATCH 0/4] aio-posix: integrate fdmon into glib event loop

Posted by Stefan Hajnoczi 10 months, 2 weeks ago

This series hooks the epoll and io_uring file descriptor monitoring
implementations up to the glib event loop so that even the main loop thread can
use them. Until now the main loop thread was stuck using ppoll(2) because the
glib event loop semantics weren't supported by fdmon-epoll.c and
fdmon-io_uring.c.

The motivation for doing this is to make io_uring available in every QEMU
thread on Linux hosts. This will make it easier to add features that use
io_uring in the future. I am preparing a follow-up series that unifies
block/io_uring.c and util/fdmon-io_uring.c so that AioContext has only one
io_uring context instead of two.

Expect performance results in the coming days comparing as ppoll(2) vs epoll(7)
vs io_uring(7).

Stefan Hajnoczi (4):
  aio-posix: fix polling mode with fdmon-io_uring
  tests/unit: skip test-nested-aio-poll with io_uring
  aio-posix: integrate fdmon into glib event loop
  aio: remove aio_context_use_g_source()

 meson.build                       |  2 +-
 include/block/aio.h               | 39 ++++++++++++--
 util/aio-posix.h                  |  5 ++
 tests/unit/test-aio.c             |  7 ++-
 tests/unit/test-nested-aio-poll.c | 13 ++---
 util/aio-posix.c                  | 81 ++++++----------------------
 util/aio-win32.c                  |  4 --
 util/async.c                      |  1 -
 util/fdmon-epoll.c                | 52 ++++++++++++++++--
 util/fdmon-io_uring.c             | 78 ++++++++++++++++++++++-----
 util/fdmon-poll.c                 | 88 ++++++++++++++++++++++++++++++-
 11 files changed, 268 insertions(+), 102 deletions(-)

-- 
2.49.0