[Qemu-block] [PATCH RFC for-2.6 0/3] block: Add meta dirty bitmap for migration/persistence

[Fam Zheng]

Vladimir,

This is what I propose to implement meta bitmap. It's implemented in the
HBitmap level to be more efficient, and the interface slightly varies too.

I'd like to use these operations to make dirty bitmap persistence more
efficient too: unchanged dirty bits don't need to be flushed to disk. So I'm
posting this as a separate series for a common base for both sides.

Posting as RFC as 2.6 dev phase is just starting, we can still tweak the
interface and/or implementation to fit the need.

Fam Zheng (3):
  HBitmap: Introduce "meta" bitmap to track bit changes
  tests: Add test code for meta bitmap
  block: Support meta dirty bitmap

 block.c                | 46 ++++++++++++++++++++++++++++++-
 block/mirror.c         |  3 +-
 blockdev.c             |  3 +-
 include/block/block.h  | 11 ++++++++
 include/qemu/hbitmap.h |  7 +++++
 migration/block.c      |  2 +-
 tests/test-hbitmap.c   | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++
 util/hbitmap.c         | 22 +++++++++++++++
 8 files changed, 164 insertions(+), 4 deletions(-)

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2.4.3