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ram: Use memory_region_test_and_clear_dirty 

This avoids having to do two walks over the dirty bitmap, once reading
the dirty bits, and anthoer cleaning them.

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2012-10-17 20:27:15 +02:00
parent 6c279db8ee
commit ece7931817
1 changed files with 3 additions and 4 deletions
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7
arch_init.c
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@ -390,13 +390,12 @@ static void migration_bitmap_sync(void)
QTAILQ_FOREACH(block, &ram_list.blocks, next) { QTAILQ_FOREACH(block, &ram_list.blocks, next) {
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) { for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE, if (memory_region_test_and_clear_dirty(block->mr,
DIRTY_MEMORY_MIGRATION)) { addr, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
migration_bitmap_set_dirty(block->mr, addr); migration_bitmap_set_dirty(block->mr, addr);
} }
} }
memory_region_reset_dirty(block->mr, 0, block->length,
DIRTY_MEMORY_MIGRATION);
} }
trace_migration_bitmap_sync_end(migration_dirty_pages trace_migration_bitmap_sync_end(migration_dirty_pages
- num_dirty_pages_init); - num_dirty_pages_init);