[Qemu-devel] [PULL 14/25] COLO: flush host dirty ram from cache

[Jason Wang]

From: zhanghailiang <zhang.zhanghaili...@huawei.com>

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

Signed-off-by: Li Zhijian <lizhij...@cn.fujitsu.com>
Signed-off-by: Zhang Chen <zhangc...@gmail.com>
Signed-off-by: Zhang Chen <chen.zh...@intel.com>
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
 migration/ram.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 4d0c5e5501..183df6f191 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3665,6 +3665,7 @@ int colo_init_ram_cache(void)
     }
     ram_state = g_new0(RAMState, 1);
     ram_state->migration_dirty_pages = 0;
+    memory_global_dirty_log_start();
 
     return 0;
 
@@ -3686,6 +3687,7 @@ void colo_release_ram_cache(void)
 {
     RAMBlock *block;
 
+    memory_global_dirty_log_stop();
     RAMBLOCK_FOREACH_MIGRATABLE(block) {
         g_free(block->bmap);
         block->bmap = NULL;
@@ -3936,6 +3938,13 @@ static void colo_flush_ram_cache(void)
     void *src_host;
     unsigned long offset = 0;
 
+    memory_global_dirty_log_sync();
+    rcu_read_lock();
+    RAMBLOCK_FOREACH_MIGRATABLE(block) {
+        migration_bitmap_sync_range(ram_state, block, 0, block->used_length);
+    }
+    rcu_read_unlock();
+
     trace_colo_flush_ram_cache_begin(ram_state->migration_dirty_pages);
     rcu_read_lock();
     block = QLIST_FIRST_RCU(&ram_list.blocks);
-- 
2.17.1