This patch series is part 2 in my EventNotifier/AIO improvements
for QEMU 1.2. It extends use of EventNotifier to the main loop
and AIO subsystems. A new API using EventNotifier is added to aio.c
and a new portable thread pool is introduced (based on code from
posix-aio-compat.c, mostly) that uses this API. raw-posix.c is
converted to use the new thread pool, and support for asynchronous
I/O is finally added to Win32 as well.
The network drivers (curl, libiscsi, nbd) have to be disabled
under Windows.
I tested this under Wine, with a RHEL virtual machine booting just as
glacially as before. However, "info blockstats" does show a slightly
higher overhead, so I would like this to be tested on real Windows hosts.
However, even if the result is negative, I would prefer to keep the early
parts (i.e. drop only the last patch) since they are a prerequisite for
more improvements to block/raw-posix.c (such as asynchronous discard
support).
Paolo Bonzini (12):
event_notifier: enable it to use pipes
event_notifier: add Win32 implementation
main-loop: use event notifiers
aio: provide platform-independent API
aio: add Win32 implementation
linux-aio: use event notifiers
qemu-thread: add QemuSemaphore
aio: add generic thread-pool facility
block: switch posix-aio-compat to threadpool
raw: merge posix-aio-compat.c into block/raw-posix.c
raw-posix: rename raw-posix-aio.h, hide unavailable prototypes
raw-win32: add emulated AIO support
Makefile.objs | 13 +-
aio.c => aio-posix.c | 9 +
aio-win32.c | 177 +++++++++
block/Makefile.objs | 6 +-
block/{raw-posix-aio.h => raw-aio.h} | 19 +-
block/raw-posix.c | 301 ++++++++++++++-
block/raw-win32.c | 189 +++++++---
event_notifier-posix.c | 118 ++++++
event_notifier-win32.c | 59 +++
event_notifier.c | 67 ----
event_notifier.h | 20 +-
linux-aio.c | 51 +--
main-loop.c | 106 +-----
oslib-posix.c | 31 --
posix-aio-compat.c | 681 ----------------------------------
qemu-aio.h | 19 +-
qemu-common.h | 1 -
qemu-thread-posix.c | 74 ++++
qemu-thread-posix.h | 5 +
qemu-thread-win32.c | 35 ++
qemu-thread-win32.h | 4 +
qemu-thread.h | 7 +
thread-pool.c | 279 ++++++++++++++
thread-pool.h | 34 ++
trace-events | 5 +
25 files changed, 1329 insertions(+), 981 deletions(-)
rename aio.c => aio-posix.c (92%)
create mode 100644 aio-win32.c
rename block/{raw-posix-aio.h => raw-aio.h} (62%)
create mode 100644 event_notifier-posix.c
create mode 100644 event_notifier-win32.c
delete mode 100644 event_notifier.c
delete mode 100644 posix-aio-compat.c
create mode 100644 thread-pool.c
create mode 100644 thread-pool.h
--
1.7.10.4
