[Qemu-devel] [PATCH 15/15] COLO: flush host dirty ram from cache

[zhanghailiang]

Don't need to flush all VM's ram from cache, only
flush the dirty pages since last checkpoint

Cc: Juan Quintela <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
Signed-off-by: Zhang Chen <address@hidden>
Signed-off-by: zhanghailiang <address@hidden>
---
 migration/ram.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 6227b94..e9ba740 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2702,6 +2702,7 @@ int colo_init_ram_cache(void)
     migration_bitmap_rcu = g_new0(struct BitmapRcu, 1);
     migration_bitmap_rcu->bmap = bitmap_new(ram_cache_pages);
     migration_dirty_pages = 0;
+    memory_global_dirty_log_start();
 
     return 0;
 
@@ -2750,6 +2751,15 @@ void colo_flush_ram_cache(void)
     void *src_host;
     ram_addr_t offset = 0;
 
+    memory_global_dirty_log_sync();
+    qemu_mutex_lock(&migration_bitmap_mutex);
+    rcu_read_lock();
+    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+        migration_bitmap_sync_range(block->offset, block->used_length);
+    }
+    rcu_read_unlock();
+    qemu_mutex_unlock(&migration_bitmap_mutex);
+
     trace_colo_flush_ram_cache_begin(migration_dirty_pages);
     rcu_read_lock();
     block = QLIST_FIRST_RCU(&ram_list.blocks);
-- 
1.8.3.1