we will use this dirty bitmap together with VM's cache RAM dirty bitmap
to decide which page in cache should be flushed into VM's RAM.
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
---
arch_init.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch_init.c b/arch_init.c
index 9adf007..693d00e 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -1750,6 +1750,7 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
int create_and_init_ram_cache(void)
{
RAMBlock *block;
+ int64_t ram_cache_pages = last_ram_offset() >> TARGET_PAGE_BITS;
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
@@ -1761,6 +1762,15 @@ int create_and_init_ram_cache(void)
}
rcu_read_unlock();
ram_cache_enable = true;
+ /*
+ * Start dirty log for slave VM, we will use this dirty bitmap together with
+ * VM's cache RAM dirty bitmap to decide which page in cache should be
+ * flushed into VM's RAM.
+ */
+ migration_bitmap = bitmap_new(ram_cache_pages);
+ migration_dirty_pages = 0;
+ memory_global_dirty_log_start();
+
return 0;
out_locked:
@@ -1781,6 +1791,12 @@ void release_ram_cache(void)
ram_cache_enable = false;
+ if (migration_bitmap) {
+ memory_global_dirty_log_stop();
+ g_free(migration_bitmap);
+ migration_bitmap = NULL;
+ }
+
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (block->host_cache) {
--
1.7.12.4
