[Qemu-devel] [PATCH v7 0/8] Block Throttle Group Support

[Alberto Garcia <berto@igalia.com>]

V7:
- Make block_set_io_throttle() keep a device in the same group if the
  parameter is omitted, and rewrite the code a bit to make it clearer
  and slightly more efficient.

- Update the documentation of block_set_io_throttle() to explain in
  detail how it works.

- Improve the iotest 093 to test scenarios with several devices in the
  same group.

- Update version number to 2.4 in the 'Since:' fields.


V6: https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg06036.html
- Use qemu_init_main_loop() in the throttling tests to make sure that
  all BDS have an AioContext attached.


V5: https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg05990.html
- Fixed and expanded the tests. There's a new one that checks that
  configuration changes affect the whole throttling group.

- Refactored the code a bit: new function schedule_next_request()

- any_timer_armed is now reset in throttle_group_config(), it was
  causing qemu-iotest 093 to fail.

- Documentation improvements


V4: https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg05558.html
- All functions from the ThrottleGroup API now receive a BlockDriverState.

- The creation/destruction of ThrottleTimers is now handled internally.

- bdrv_io_limits_enable() no longer accepts NULL as a valid group name.

- No member of a group can access someone else's throttled_reqs queues
  anymore.

- No member of a group can access someone else's timers unless they
  have queued requests.

- After a timer is fired make sure that there was actually a request
  in the queue, and schedule a new one otherwise.

- Protect bdrv_swap() by locking the throttling group.

- throttle_group_co_io_limits_intercept() is now marked as a coroutine
  function.

- Documentation updates.

Regards,

Berto

Alberto Garcia (7):
  throttle: Add throttle group infrastructure
  throttle: Add throttle group infrastructure tests
  throttle: Add throttle group support
  throttle: acquire the ThrottleGroup lock in bdrv_swap()
  throttle: add the name of the ThrottleGroup to BlockDeviceInfo
  throttle: Update throttle infrastructure copyright
  qemu-iotests: expand test 093 to support group throttling

Benoît Canet (1):
  throttle: Extract timers from ThrottleState into a separate structure

 block.c                         | 101 ++++-----
 block/Makefile.objs             |   1 +
 block/qapi.c                    |   8 +-
 block/throttle-groups.c         | 489 ++++++++++++++++++++++++++++++++++++++++
 blockdev.c                      |  38 +++-
 hmp.c                           |  10 +-
 include/block/block.h           |   3 +-
 include/block/block_int.h       |   7 +-
 include/block/throttle-groups.h |  46 ++++
 include/qemu/throttle.h         |  46 ++--
 qapi/block-core.json            |  29 ++-
 qemu-options.hx                 |   1 +
 qmp-commands.hx                 |   3 +-
 tests/qemu-iotests/093          |  93 +++++---
 tests/test-throttle.c           | 161 +++++++++----
 util/throttle.c                 |  81 ++++---
 16 files changed, 919 insertions(+), 198 deletions(-)
 create mode 100644 block/throttle-groups.c
 create mode 100644 include/block/throttle-groups.h

-- 
2.1.4