--- a/src/hotspot/share/logging/logOutput.hpp	Wed Feb 28 23:23:35 2018 -0800
+++ b/src/hotspot/share/logging/logOutput.hpp	Wed Feb 28 22:38:53 2018 +0100
@@ -32,6 +32,7 @@
 
 class LogDecorations;
 class LogMessageBuffer;
+class LogSelection;
 class LogTagSet;
 
 // The base class/interface for log outputs.
@@ -52,16 +53,18 @@
   char* _config_string;
   size_t _config_string_buffer_size;
 
+  // Adds the log selection to the config description (e.g. "tag1+tag2*=level").
+  void add_to_config_string(const LogSelection& selection);
+
  protected:
   LogDecorators _decorators;
 
-  // Clears any previous config description in preparation of reconfiguration.
-  void clear_config_string();
-  // Adds the tagset on the given level to the config description (e.g. "tag1+tag2=level").
-  void add_to_config_string(const LogTagSet* ts, LogLevelType level);
   // Replaces the current config description with the given string.
   void set_config_string(const char* string);
 
+  // Update the config string for this output to reflect its current configuration
+  void update_config_string(const size_t on_level[LogLevel::Count]);
+
  public:
   void set_decorators(const LogDecorators &decorators) {
     _decorators = decorators;