[PATCH v2 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 | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 76d4fee..59ff0cf 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3018,6 +3018,18 @@ static void decompress_data_with_multi_threads(QEMUFile *f,
     qemu_mutex_unlock(&decomp_done_lock);
 }
 
+ /*
+  * 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_init_ram_state(void)
+{
+    ram_state_init(&ram_state);
+    ram_state->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
@@ -3061,7 +3073,7 @@ int colo_init_ram_cache(void)
         }
     }
 
-    ram_state_init(&ram_state);
+    colo_init_ram_state();
     return 0;
 }
 
-- 
1.8.3.1