+What users will do with marker interface:
+
+from userspace:
+enable/disable marker_name (act on any marker, reg by module or other)
+channel marker_name channel_name (act on any marker)
+
+Default: use serializer
+But.. module can override _default_ probe with a "register" operation.
+
+Use case
+Set channel
+Register by specific module (unregister default, register specific)
+activate.
+
+Serve as a proxy for probe registration.
+
+