Re: [Qemu-devel] [RFC][PATCH 0/9] Use coroutines in the block layer

[Stefan Hajnoczi <stefanha@gmail.com>]

On Fri, Jul 15, 2011 at 06:47:30PM +0200, Kevin Wolf wrote:
> Based on Stefan's latest coroutine patches. This series makes qcow and qcow2
> take advantage of the new coroutine infrastructure. Both formats used
> synchronous operations for accessing their metadata and blocked the guest CPU
> during that time. With coroutines, the I/O will happen asynchronously in the
> background and the CPU won't be blocked any more.
> 
> Kevin Wolf (9):
>   block: Add bdrv_co_readv/writev
>   block: Emulate AIO functions with bdrv_co_readv/writev
>   block: Add bdrv_co_readv/writev emulation
>   coroutines: Locks
>   qcow2: Use coroutines
>   qcow: Use coroutines
>   async: Remove AsyncContext
>   coroutines: Use one global bottom half for CoQueue
>   block: Use bdrv_co_* instead of synchronous versions in coroutines
> 
>  Makefile.objs         |    4 +-
>  async.c               |   98 ++-----------------
>  block.c               |  271 ++++++++++++++++++++++++++++++++++++++++++++++--
>  block.h               |    5 +
>  block/qcow.c          |  180 +++++++++++---------------------
>  block/qcow2-cluster.c |   26 ++---
>  block/qcow2.c         |  240 ++++++++++++++++----------------------------
>  block/qcow2.h         |    5 +-
>  block/qed-table.c     |   14 ---
>  block/qed.c           |    4 -
>  block_int.h           |    6 +
>  linux-aio.c           |   24 +----
>  posix-aio-compat.c    |   11 --
>  qemu-common.h         |    4 -
>  qemu-coroutine-int.h  |    1 +
>  qemu-coroutine-lock.c |  117 +++++++++++++++++++++
>  qemu-coroutine.h      |   62 +++++++++++
>  trace-events          |   11 ++
>  18 files changed, 636 insertions(+), 447 deletions(-)
>  create mode 100644 qemu-coroutine-lock.c
> 
> -- 
> 1.7.6

Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>