diff -r ae5b2f1dcf12 -r 2a241e764894 src/share/vm/runtime/safepoint.cpp
--- a/src/share/vm/runtime/safepoint.cpp	Wed Jun 08 21:48:38 2011 -0400
+++ b/src/share/vm/runtime/safepoint.cpp	Fri Jun 10 15:08:36 2011 -0700
@@ -511,6 +511,11 @@
 
   TraceTime t4("sweeping nmethods", TraceSafepointCleanupTime);
   NMethodSweeper::scan_stacks();
+
+  // rotate log files?
+  if (UseGCLogFileRotation) {
+    gclog_or_tty->rotate_log();
+  }
 }