Add periodic exec of one-shot commands

.reniced.yaml.example

@@ -4,8 +4,23 @@ daemon: true
 # PID file for daemon.
 pidfile: /var/run/reniced.pid
 
-# Delay among iterations.
-loop_delay: 5000
+# Delay between process list update task consecutive runs.
+process_list_update_period: 5000
+
+# Delay between kill consecutive tasks.
+process_kill_period: 5000
+
+# Delay between changing niceness consecutive tasks.
+process_nice_period: 5000
+
+# Delay between changing io niceness consecutive tasks (linux-only).
+process_ionice_period: 5000
+
+# Period of time between consecutive periodic_process list tasks hammering.
+periodic_process_invocation_period: 60000
+
+# Period of time between process exec() invocations.
+periodic_process_invocation_delay: 500
 
 # Whether to print debug messages to stdout.
 debug: true
@@ -15,7 +30,11 @@ max_workers: 3
 
 # Capacity of non-blocking tasks. All tasks that exceeding this capacity will block submission of new tasks until queue
 # has vacant place for new task.
-nb_capacity: 30
+nb_capacity: 3000
+
+# Time to time run these commands.
+periodic_process:
+    - ps xa
 
 kill:
   - sig: stop