[PATCH v1 0/6] support dirtyrate at the granualrity of vcpu

[huangy81@chinatelecom.cn]

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

Since the Dirty Ring on QEMU part has been merged recently, how to use
this feature is under consideration.

In the scene of migration, it is valuable to provide a more accurante
interface to track dirty memory than existing one, so that the upper
layer application can make a wise decision, or whatever. More importantly,
dirtyrate info at the granualrity of vcpu could provide a possibility to
make migration convergent by imposing restriction on vcpu. With Dirty
Ring, we can calculate dirtyrate efficiently and cheaply.

The old interface implemented by sampling pages, it consumes cpu 
resource, and the larger guest memory size become, the more cpu resource
it consumes, namely, hard to scale. New interface has no such drawback.

Please review, thanks !

Best Regards !

Hyman Huang(黄勇) (6):
  KVM: add kvm_dirty_ring_enabled function
  KVM: introduce dirty_pages into CPUState
  migration/dirtyrate: add vcpu option for qmp calc-dirty-rate
  migration/dirtyrate: adjust struct DirtyRateStat
  migration/dirtyrate: check support of calculation for vcpu
  migration/dirtyrate: implement dirty-ring dirtyrate calculation

 accel/kvm/kvm-all.c    |  11 +++
 include/hw/core/cpu.h  |   2 +
 include/sysemu/kvm.h   |   1 +
 migration/dirtyrate.c  | 179 +++++++++++++++++++++++++++++++++++++----
 migration/dirtyrate.h  |  19 ++++-
 migration/trace-events |   1 +
 qapi/migration.json    |  28 ++++++-
 7 files changed, 222 insertions(+), 19 deletions(-)

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2.24.3