[Qemu-devel] [RFC PATCH v2 0/6] linux-aio: Convert to coroutines

[Kevin Wolf <kwolf@redhat.com>]

This is my current branch for converting the linux-aio interface to
coroutines. I started this as a performance optimisation, but I think it
also makes it much easier to avoid the recursive coroutine reentrace
that Ming Lei has sent a relatively complex callback-based patch for.
See patch 3 for a quick attempt on fixing the same problem in a
coroutine-based linux-aio implementation.

Not ready to be merged mainly because of incomplete testing and
benchmarking.

v2:
- Added patches 4-6 for handling of -EAGAIN and partial submits so that
  Ming Lei has a comparison to all of his callback-based series


Kevin Wolf (6):
  qemu-img bench
  raw-posix: Convert Linux AIO submission to coroutines
  linux-aio: Don't reenter request coroutine recursively
  linux-aio: Support partial io_submits
  linux-aio: On -EAGAIN, wait for completions
  linux-aio: Queue requests instead of returning -EAGAIN

 block/linux-aio.c | 159 +++++++++++++++++++++++++++----------------------
 block/raw-aio.h   |   5 +-
 block/raw-posix.c |  62 +++++++++----------
 qemu-img-cmds.hx  |   6 ++
 qemu-img.c        | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 qemu-img.texi     |  10 ++++
 6 files changed, 309 insertions(+), 107 deletions(-)

-- 
1.8.3.1