[PATCH 2/3] Reduce the time of checkpoint for COLO

[leirao <lei.rao@intel.com>]

we should set ram_bulk_stage to false after ram_state_init,
otherwise the bitmap will be unused in migration_bitmap_find_dirty.
all pages in ram cache will be flushed to the ram of secondary guest
for each checkpoint.

Signed-off-by: leirao <lei.rao@intel.com>
---
 migration/ram.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 76d4fee..6a2b6c1 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3019,6 +3019,17 @@ static void decompress_data_with_multi_threads(QEMUFile *f,
 }
 
 /*
+ * we must set ram_bulk_stage to fasle, otherwise in
+ * migation_bitmap_find_dirty the bitmap will be unused and
+ * all the pages in ram cache wil be flushed to the ram of
+ * secondary VM.
+ */
+static void colo_set_ram_state(RAMState *rsp)
+{
+    rsp->ram_bulk_stage = false;
+}
+
+/*
  * colo cache: this is for secondary VM, we cache the whole
  * memory of the secondary VM, it is need to hold the global lock
  * to call this helper.
@@ -3062,6 +3073,7 @@ int colo_init_ram_cache(void)
     }
 
     ram_state_init(&ram_state);
+    colo_set_ram_state(ram_state);
     return 0;
 }
 
-- 
1.8.3.1