30.4.4.8 The ps_setup_enable_background_threads() Procedure
 
 
 
          Enables Performance Schema instrumentation for all background
          threads. Produces a result set indicating how many background
          threads were enabled. Already enabled threads do not count.
mysql> CALL sys.ps_setup_enable_background_threads();
+-------------------------------+
| summary                       |
+-------------------------------+
| Enabled 24 background threads |
+-------------------------------+