[PATCH v2] Introduce dirty ring live migration test for guestperf

[huangy81@chinatelecom.cn]

From: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>

v2:
- rebase on master
- fix style problems and make qemu test passes

Ping

Please review. Thanks,

Regards
Yong

v1:
- original version sent by accident, send the right patch

Dirtylimit implementation has been reviewed in the past few months, if
things go well, it will be merged in the near future, which is the first
step to implement a new live migration feature. For more details refer to: 
https://lore.kernel.org/qemu-devel/cover.1646247968.git.huangy81@chinatelecom.cn/

The second step is to implement the "dirtylimit" capability of live
migration basing on the implementation in first step, and the main
logic is almost done, refer to: 
https://github.com/newfriday/qemu/commits/migration_dirtylimit_v1

Since "dirtylimit" capability of live migration is basing on dirty
ring, so if we want compare live migration used "dirtylimit" capability 
with other capabilities such as "auto-converge" in performance, set
dirty ring size when start vm using guestperf tool is an convenient way.

So let's introduce dirty ring size for guestperf tool. 

Hyman Huang (1):
  tests/migration: Introduce dirty-ring-size option into guestperf

 tests/migration/guestperf/engine.py   | 6 +++++-
 tests/migration/guestperf/hardware.py | 8 ++++++--
 tests/migration/guestperf/shell.py    | 7 ++++++-
 3 files changed, 17 insertions(+), 4 deletions(-)

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1.8.3.1