--- old/src/hotspot/share/gc/z/zDirector.cpp	2018-03-06 16:38:51.195364645 +0100
+++ new/src/hotspot/share/gc/z/zDirector.cpp	2018-03-06 16:38:51.037357866 +0100
@@ -124,7 +124,7 @@
 
   // Calculate max duration of a GC cycle. The duration of GC is a moving
   // average, we add ~3.3 sigma to account for the GC duration variance.
-  const AbsSeq& duration_of_gc = ZStatCycle::duration();
+  const AbsSeq& duration_of_gc = ZStatCycle::normalized_duration();
   const double max_duration_of_gc = duration_of_gc.davg() + (duration_of_gc.dsd() * one_in_1000);
 
   // Calculate time until GC given the time until OOM and max duration of GC.
@@ -167,7 +167,7 @@
 
   const double assumed_throughput_drop_during_gc = 0.50; // 50%
   const double acceptable_throughput_drop = 0.01;        // 1%
-  const AbsSeq& duration_of_gc = ZStatCycle::duration();
+  const AbsSeq& duration_of_gc = ZStatCycle::normalized_duration();
   const double max_duration_of_gc = duration_of_gc.davg() + (duration_of_gc.dsd() * one_in_1000);
   const double acceptable_gc_interval = max_duration_of_gc * ((assumed_throughput_drop_during_gc / acceptable_throughput_drop) - 1.0);
   const double time_until_gc = acceptable_gc_interval - time_since_last_gc;