migration: Create multifd_bytes ram_counter

This will include how many bytes they are sent through multifd.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

hmp.c

@@ -234,6 +234,8 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
                        info->ram->dirty_sync_count);
         monitor_printf(mon, "page size: %" PRIu64 " kbytes\n",
                        info->ram->page_size >> 10);
+        monitor_printf(mon, "multifd bytes: %" PRIu64 " kbytes\n",
+                       info->ram->multifd_bytes >> 10);
 
         if (info->ram->dirty_pages_rate) {
             monitor_printf(mon, "dirty pages rate: %" PRIu64 " pages\n",

migration/migration.c

@@ -708,6 +708,7 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
     info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
     info->ram->postcopy_requests = ram_counters.postcopy_requests;
     info->ram->page_size = qemu_target_page_size();
+    info->ram->multifd_bytes = ram_counters.multifd_bytes;
 
     if (migrate_use_xbzrle()) {
         info->has_xbzrle_cache = true;

qapi/migration.json

@@ -39,6 +39,8 @@
 # @page-size: The number of bytes per page for the various page-based
 #        statistics (since 2.10)
 #
+# @multifd-bytes: The number of bytes sent through multifd (since 3.0)
+#
 # Since: 0.14.0
 ##
 { 'struct': 'MigrationStats',
@@ -46,7 +48,8 @@
            'duplicate': 'int', 'skipped': 'int', 'normal': 'int',
            'normal-bytes': 'int', 'dirty-pages-rate' : 'int',
            'mbps' : 'number', 'dirty-sync-count' : 'int',
-           'postcopy-requests' : 'int', 'page-size' : 'int' } }
+           'postcopy-requests' : 'int', 'page-size' : 'int',
+           'multifd-bytes' : 'uint64' } }
 
 ##
 # @XBZRLECacheStats: