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[Qemu-devel] [PATCH v3 00/10] aio_context_acquire/release pushdown, part

From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH v3 00/10] aio_context_acquire/release pushdown, part 1
Date: Wed, 4 Jan 2017 14:26:15 +0100

This is the first step of pushing down the AioContext lock.  Bottom halves
are already protected by their own lock, use it also for walking_bh
and for the handlers list (including walking_handlers).  The (lock,
walking_foo) pair is wrapped into the QemuLockCnt primitive.


        fix missing unlock

        rebased on top of polling patches
        moved documentation to include/
        new patch "aio-posix: split aio_dispatch_handlers out of aio_dispatch"
        replaced atomic_read with atomic_mb_read in qemu_lockcnt_inc
        replaced futex* function and macro names with qemu_futex*
        removed atomic access to node->pfd.revents (because there is no
          concurrent aio_poll anymore after the BDRV_POLL_WHILE series)
        left "aio: push aio_context_acquire/release down to dispatching"
          to a later series

Paolo Bonzini (10):
  aio: rename bh_lock to list_lock
  qemu-thread: introduce QemuLockCnt
  aio: make ctx->list_lock a QemuLockCnt, subsuming ctx->walking_bh
  qemu-thread: optimize QemuLockCnt with futexes on Linux
  aio-posix: split aio_dispatch_handlers out of aio_dispatch
  aio: tweak walking in dispatch phase
  aio-posix: remove walking_handlers, protecting AioHandler list with
  aio-win32: remove walking_handlers, protecting AioHandler list with
  aio: document locking
  async: optimize aio_bh_poll

 aio-posix.c                 | 116 +++++++------
 aio-win32.c                 |  83 ++++++----
 async.c                     |  45 ++---
 docs/lockcnt.txt            | 277 +++++++++++++++++++++++++++++++
 docs/multiple-iothreads.txt |  13 +-
 include/block/aio.h         |  38 ++---
 include/qemu/futex.h        |  36 ++++
 include/qemu/thread.h       | 111 +++++++++++++
 util/Makefile.objs          |   1 +
 util/lockcnt.c              | 395 ++++++++++++++++++++++++++++++++++++++++++++
 util/qemu-thread-posix.c    |  35 +---
 util/qemu-thread-win32.c    |   2 +-
 util/trace-events           |  10 ++
 13 files changed, 1003 insertions(+), 159 deletions(-)
 create mode 100644 docs/lockcnt.txt
 create mode 100644 include/qemu/futex.h
 create mode 100644 util/lockcnt.c


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