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(-)
