Re: [Qemu-devel] [PATCH v2 00/12] Portable thread-pool/AIO, Win32 emulated AIO

[Paolo Bonzini <pbonzini@redhat.com>]

Il 25/10/2012 18:01, Stefan Hajnoczi ha scritto:
> On Tue, Aug 7, 2012 at 1:17 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> 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.  They are unlikely to have any users, since they
>> were broken until 1.0 and (unlike slirp) we never had any report.
>>
>> I tested this under Wine, with a RHEL virtual machine booting just as
>> glacially as before.  "info blockstats" does show a slightly higher
>> overhead, so I would like this to be tested on real Windows hosts.
>> 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
>> improvements to block/raw-posix.c (such as asynchronous discard
>> support) scheduled for 1.3.  The platform independent APIs introduced
>> by patches 4 and 5 are also useful for native AIO on Win32.
>>
>>
>> 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                        |  12 +-
>>  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                    | 297 ++++++++++++++-
>>  block/raw-win32.c                    | 187 +++++++---
>>  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                   | 679 -----------------------------------
>>  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 file modificati, 1323 inserzioni(+), 978 rimozioni(-)
>>  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
> 
> Ping, is there a v3?

No, but I rebased it on top of AioContext in my branch.  If you're
interested I can resubmit it.

Paolo