[Qemu-devel] [PATCH 00/12] Portable thread-pool/AIO, Win32 emulated AIO

[Paolo Bonzini]

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