--- old/src/share/vm/logging/logFileOutput.cpp	2016-06-30 18:25:09.700257959 +0900
+++ new/src/share/vm/logging/logFileOutput.cpp	2016-06-30 18:25:09.546243825 +0900
@@ -428,3 +428,13 @@
   result[result_len] = '\0';
   return result;
 }
+
+void LogFileOutput::describe(outputStream *out, size_t index) {
+  LogOutput::describe(out, index);
+  out->print(" ");
+
+  out->print("filecount=%u,filesize=" SIZE_FORMAT "%s", _file_count,
+             byte_size_in_proper_unit(_rotate_size),
+             proper_unit_for_byte_size(_rotate_size));
+}
+