This series moves the event loop thread out of dataplane code. It makes
-iothread id=foo a separate concept. This makes it possible to bind several
devices to the same iothread.
Syntax:
qemu -iothread id=iothread0 \
-device virtio-blk-pci,iothread=iothread0,x-data-plane=on,...
For backwards-compatibility the iothread= parameter can be omitted. A
per-device IOThread will be created behind the scenes (just like the old 1:1
threading model).
This series includes the aio_context_acquire/release API which makes it easy to
synchronize access to AioContext across threads.
The IOThread object is really a stand-in for Michael Roth's QContext. They
both have the same purpose but I needed something to develop against while
QContext is unfinished. In order to make progress I'd like to agree on the
user-visible API that IOThread/QContext presents. That way QContext can be
implemented step-by-step without holding up dataplane.
Finally, the -iothread command-line option will soon be replaced with -object.
I am following Igor's work in the area and will try to help get that code in.
Stefan Hajnoczi (7):
rfifolock: add recursive FIFO lock
aio: add aio_context_acquire() and aio_context_release()
iothread: add I/O thread object
iothread: command-line option
qdev: add get_pointer_and_free() for temporary strings
iothread: add "iothread" qdev property type
dataplane: replace internal thread with IOThread
Makefile.objs | 1 +
async.c | 18 +++++
hw/block/dataplane/virtio-blk.c | 91 ++++++++++++-----------
hw/core/qdev-properties-system.c | 65 +++++++++++++++++
include/block/aio.h | 18 +++++
include/hw/qdev-properties.h | 3 +
include/hw/virtio/virtio-blk.h | 8 ++-
include/qemu/rfifolock.h | 54 ++++++++++++++
include/sysemu/iothread.h | 32 +++++++++
include/sysemu/sysemu.h | 1 +
iothread.c | 152 +++++++++++++++++++++++++++++++++++++++
qemu-options.hx | 8 +++
tests/Makefile | 2 +
tests/test-aio.c | 58 +++++++++++++++
tests/test-rfifolock.c | 90 +++++++++++++++++++++++
util/Makefile.objs | 1 +
util/rfifolock.c | 78 ++++++++++++++++++++
vl.c | 12 ++++
18 files changed, 647 insertions(+), 45 deletions(-)
create mode 100644 include/qemu/rfifolock.h
create mode 100644 include/sysemu/iothread.h
create mode 100644 iothread.c
create mode 100644 tests/test-rfifolock.c
create mode 100644 util/rfifolock.c
--
1.8.4.2
