diff -r eee5798e1b28 -r dc471edac21e src/share/vm/runtime/safepoint.cpp
--- a/src/share/vm/runtime/safepoint.cpp	Mon Oct 28 13:29:09 2019 +0800
+++ b/src/share/vm/runtime/safepoint.cpp	Thu Oct 31 19:36:58 2019 +0100
@@ -537,6 +537,7 @@
 
   // rotate log files?
   if (UseGCLogFileRotation) {
+    TraceTime t8("rotating gc logs", TraceSafepointCleanupTime);
     gclog_or_tty->rotate_log(false);
   }