[Qemu-devel] [PATCH 0/3] throttle: use AioContext for dataplane support

[Stefan Hajnoczi <stefanha@redhat.com>]

This series applies on top of my "dataplane: use QEMU block layer" series.

Now that the dataplane code path is using the QEMU block layer we should make
I/O throttling limits safe to use.  When the block_set_io_throttle monitor
command is executed, the BlockDriverState's AioContext must be acquired in
order to prevent race conditions with the IOThread that is processing requests
from the guest.

The new block layer AioContext detach/attach mechanism needs to be extended to
move the throttling timer to a new AioContext.  This makes throttling work
across bdrv_set_aio_context() calls.

The result of this series is that I/O throttling works with dataplane and
limits may be changed at runtime using the monitor.

Stefan Hajnoczi (3):
  throttle: add throttle_detach/attach_aio_context()
  throttle: add detach/attach test case
  blockdev: acquire AioContext in block_set_io_throttle

 block.c                 |  7 +++++++
 blockdev.c              |  6 ++++++
 include/qemu/throttle.h | 10 ++++++++++
 tests/test-throttle.c   | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
 util/throttle.c         | 27 +++++++++++++++++++++++----
 5 files changed, 90 insertions(+), 9 deletions(-)

-- 
1.9.0