diff -r 8afee153274a -r 035d2e036a9b src/share/vm/gc_implementation/g1/concurrentZFThread.cpp
--- a/src/share/vm/gc_implementation/g1/concurrentZFThread.cpp	Mon Oct 05 05:51:22 2009 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentZFThread.cpp	Fri Oct 02 16:12:07 2009 -0400
@@ -157,10 +157,14 @@
   }
 }
 
-void ConcurrentZFThread::print() {
-  gclog_or_tty->print("\"Concurrent ZF Thread\" ");
-  Thread::print();
-  gclog_or_tty->cr();
+void ConcurrentZFThread::print() const {
+  print_on(tty);
+}
+
+void ConcurrentZFThread::print_on(outputStream* st) const {
+  st->print("\"G1 Concurrent Zero-Fill Thread\" ");
+  Thread::print_on(st);
+  st->cr();
 }