Re: [Qemu-devel] [PATCH 0/2] coroutine: dataplane support

[Stefan Hajnoczi]

On Fri, May 17, 2013 at 03:51:24PM +0200, Stefan Hajnoczi wrote:
> There is ongoing work to enable multiple event loop threads.  This will allow
> QEMU itself to take advantage of SMP and reduce Big QEMU Lock (BQL) 
> contention.
> This series is one step in that effort.
> 
> These patches make coroutines safe in a multi-event loop/multi-threaded world.
> I have successfully tested them running qcow2 in a dataplane thread (further
> patches are required which I'll be sending soon).
> 
> Patch 1 protects the global coroutine freelist with a lock :).
> 
> Patch 2 drops the CoQueue dependency on AioContext.  This allows CoMutex and
> CoRwlock to operate in a dataplane thread whereas previously we always
> scheduled coroutines in the QEMU iothread.
> 
> Stefan Hajnoczi (2):
>   coroutine: protect global pool with a mutex
>   coroutine: stop using AioContext in CoQueue
> 
>  include/block/coroutine_int.h |  4 ++++
>  qemu-coroutine-lock.c         | 56 
> ++++++++++++++++---------------------------
>  qemu-coroutine.c              | 23 ++++++++++++++++--
>  trace-events                  |  2 +-
>  4 files changed, 47 insertions(+), 38 deletions(-)
> 
> -- 
> 1.8.1.4
> 
> 

Applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan