[Qemu-devel] [PATCH v4 0/4] Introduce bit-based phys_ram_dirty, and bit-based dirty page checker.

[Yoshiaki Tamura]

The dirty and non-dirty pages are checked one by one.  When most of the memory
is not dirty, checking the dirty and non-dirty pages by multiple page size
should be much faster than checking them one by one.  We introduced bit-based
phys_ram_dirty for VGA, CODE, MIGRATION, MASTER, and
cpu_physical_memory_get_dirty_range() for this purpose.
                                                                                
Changes from v3 to v4 are:

- Merged {1,2,3}/6 to compile correctly.
- Fix setting bits after phys_ram_dirty allocation.
- renamed DIRTY_FLAG and DIRTY_IDX converter function.

Changes from v2 to v3 are:

- Change FLAGS value to (1,2,4,8), and add IDX (0,1,2,3)
- Use ffs to convert FLAGS to IDX.
- Add a helper function which takes IDX.
- Change the behavior of MASTER as a buffer.
- Change dirty bitmap access to a loop.
- Add brace after if ()

Yoshiaki Tamura (4):
  Modify DIRTY_FLAG value and introduce DIRTY_IDX to use as indexes of
    bit-based phys_ram_dirty.
  Introduce cpu_physical_memory_get_dirty_range().
  Use cpu_physical_memory_set_dirty_range() to update phys_ram_dirty.
  Use cpu_physical_memory_get_dirty_range() to check multiple dirty
    pages.

 arch_init.c   |   54 ++++++++++++++---------
 bswap.h       |    2 +
 cpu-all.h     |  131 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 exec.c        |   82 +++++++++++++++++++++++++++++++++--
 kvm-all.c     |   33 +++++++--------
 qemu-common.h |    3 +
 6 files changed, 242 insertions(+), 63 deletions(-)