--- old/src/share/vm/logging/logTag.hpp	2015-09-15 11:20:10.778623606 +0200
+++ new/src/share/vm/logging/logTag.hpp	2015-09-15 11:20:10.694623604 +0200
@@ -23,17 +23,15 @@
  */
 #ifndef SHARE_VM_LOGGING_LOGTAG_HPP
 #define SHARE_VM_LOGGING_LOGTAG_HPP
+
+#include "memory/allocation.hpp"
 #include "utilities/globalDefinitions.hpp"
 
 // List of available logging tags. New tags should be added here.
 // (The tags 'all', 'disable' and 'help' are special tags that can
 // not be used in log calls, and should not be listed below.)
 #define LOG_TAG_LIST \
-  LOG_TAG(gc) \
-  LOG_TAG(rt) \
-  LOG_TAG(svc) \
-  LOG_TAG(logging) \
-  LOG_TAG(comp)
+  LOG_TAG(logging)
 
 #define PREFIX_LOG_TAG(T) (LogTag::T)
 
@@ -46,8 +44,16 @@
 #define EXPAND_VARARGS(x) x
 #define LOG_TAGS(...) EXPAND_VARARGS(LOG_TAGS_EXPANDED(__VA_ARGS__, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG, __NO_TAG))
 
-class LogTag {
+// Log tags are used to classify log messages.
+// Each log message can be assigned between 1 to LogTag::MaxTags number of tags.
+// Specifying multiple tags for a log message means that only outputs configured
+// for those exact tags, or a subset of the tags with a wildcard, will see the logging.
+// Multiple tags should be comma separated, e.g. log_error(tag1, tag2)("msg").
+class LogTag : public AllStatic {
  public:
+  // The maximum number of tags that a single log message can have.
+  // E.g. there might be hundreds of different tags available,
+  // but a specific log message can only be tagged with up to MaxTags of those.
   static const size_t MaxTags = 5;
 
   enum type {
@@ -70,4 +76,4 @@
 
 typedef LogTag::type LogTagType;
 
-#endif
+#endif // SHARE_VM_LOGGING_LOGTAG_HPP