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

[Stefan Hajnoczi <stefanha@redhat.com>]

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