migration: Make dirty_bytes_last_sync atomic

As we set its value, it needs to be operated with atomics.
We rename it from remaining to better reflect its meaning.

Statistics always return the real reamaining bytes.  This was used to
store how much pages where dirty on the previous generation, so we can
calculate the expected downtime as: dirty_bytes_last_sync /
current_bandwith.

If we use the actual remaining bytes, we would see a very small value
at the end of the iteration.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

---

I am open to use ram_bytes_remaining() in its only use and be more
"optimistic" about the downtime.

Don't use __nocheck() functions.
Use stat64_get() now that it exists.

migration/migration.c

@@ -2692,7 +2692,8 @@ static void migration_update_counters(MigrationState *s,
      */
     if (stat64_get(&ram_counters.dirty_pages_rate) &&
         transferred > 10000) {
-        s->expected_downtime = ram_counters.remaining / bandwidth;
+        s->expected_downtime =
+            stat64_get(&ram_counters.dirty_bytes_last_sync) / bandwidth;
     }
 
     qemu_file_reset_rate_limit(s->to_dst_file);

migration/ram.c

@@ -1224,7 +1224,7 @@ static void migration_bitmap_sync(RAMState *rs)
         RAMBLOCK_FOREACH_NOT_IGNORED(block) {
             ramblock_sync_dirty_bitmap(rs, block);
         }
-        ram_counters.remaining = ram_bytes_remaining();
+        stat64_set(&ram_counters.dirty_bytes_last_sync, ram_bytes_remaining());
     }
     qemu_mutex_unlock(&rs->bitmap_mutex);
 

migration/ram.h

@@ -41,6 +41,7 @@
  * one thread).
  */
 typedef struct {
+    Stat64 dirty_bytes_last_sync;
     Stat64 dirty_pages_rate;
     Stat64 dirty_sync_count;
     Stat64 dirty_sync_missed_zero_copy;
@@ -51,7 +52,6 @@ typedef struct {
     Stat64 postcopy_bytes;
     Stat64 postcopy_requests;
     Stat64 precopy_bytes;
-    int64_t remaining;
     Stat64 transferred;
 } RAMStats;