migration: set dirty_pages_rate before autoconverge logic

Currently, a "period" in the RAM migration logic is at least a second
long and accounts for what happened since the last period (or the
beginning of the migration). The dirty_pages_rate counter is calculated
at the end this logic.

If the auto convergence capability is enabled from the start of the
migration, it won't be able to use this counter the first time around.
This calculates dirty_pages_rate as soon as a period is deemed over,
which allows for it to be used immediately.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

diff --git a/migration/ram.c b/migration/ram.c
index 36bf720c27e0e766670fb39462a9206a0a9b59ef..495ecbe49218be25748d77fda5f8deead1d6ca97 100644 (file)
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -694,6 +694,10 @@ static void migration_bitmap_sync(RAMState *rs)
 
     /* more than 1 second = 1000 millisecons */
     if (end_time > rs->time_last_bitmap_sync + 1000) {
+        /* calculate period counters */
+        rs->dirty_pages_rate = rs->num_dirty_pages_period * 1000
+            / (end_time - rs->time_last_bitmap_sync);
+
         if (migrate_auto_converge()) {
             /* The following detection logic can be refined later. For now:
                Check to see if the dirtied bytes is 50% more than the approx.
@@ -702,15 +706,14 @@ static void migration_bitmap_sync(RAMState *rs)
                throttling */
             bytes_xfer_now = ram_bytes_transferred();
 
-            if (rs->dirty_pages_rate &&
-               (rs->num_dirty_pages_period * TARGET_PAGE_SIZE >
+            if ((rs->num_dirty_pages_period * TARGET_PAGE_SIZE >
                    (bytes_xfer_now - rs->bytes_xfer_prev) / 2) &&
-               (rs->dirty_rate_high_cnt++ >= 2)) {
+                (rs->dirty_rate_high_cnt++ >= 2)) {
                     trace_migration_throttle();
                     rs->dirty_rate_high_cnt = 0;
                     mig_throttle_guest_down();
-             }
-             rs->bytes_xfer_prev = bytes_xfer_now;
+            }
+            rs->bytes_xfer_prev = bytes_xfer_now;
         }
 
         if (migrate_use_xbzrle()) {
@@ -723,8 +726,8 @@ static void migration_bitmap_sync(RAMState *rs)
             rs->iterations_prev = rs->iterations;
             rs->xbzrle_cache_miss_prev = rs->xbzrle_cache_miss;
         }
-        rs->dirty_pages_rate = rs->num_dirty_pages_period * 1000
-            / (end_time - rs->time_last_bitmap_sync);
+
+        /* reset period counters */
         rs->time_last_bitmap_sync = end_time;
         rs->num_dirty_pages_period = 0;
     }