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ram: Introduce migration_bitmap_test_and_reset_dirty() 

It just test if the dirty bit is set, and clears it.

Signed-off-by: Juan Quintela <quintela@redhat.com>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
This commit is contained in:
Juan Quintela 2012-07-20 10:36:12 +02:00
parent e44d26c8f3
commit 69268cde14
1 changed files with 14 additions and 5 deletions
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19
arch_init.c
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@ -331,6 +331,19 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
static RAMBlock *last_block;
static ram_addr_t last_offset;
static inline bool migration_bitmap_test_and_reset_dirty(MemoryRegion *mr,
ram_addr_t offset)
{
bool ret = memory_region_get_dirty(mr, offset, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
if (ret) {
memory_region_reset_dirty(mr, offset, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
}
return ret;
}
static inline void migration_bitmap_set_dirty(MemoryRegion *mr, int length)
{
ram_addr_t addr;
@ -364,14 +377,10 @@ static int ram_save_block(QEMUFile *f, bool last_stage)
do {
mr = block->mr;
if (memory_region_get_dirty(mr, offset, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
if (migration_bitmap_test_and_reset_dirty(mr, offset)) {
uint8_t *p;
int cont = (block == last_block) ? RAM_SAVE_FLAG_CONTINUE : 0;
memory_region_reset_dirty(mr, offset, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
p = memory_region_get_ram_ptr(mr) + offset;
if (is_dup_page(p)) {