--- a/src/hotspot/share/gc/g1/concurrentMarkThread.hpp	Tue Oct 10 14:05:04 2017 +0200
+++ b/src/hotspot/share/gc/g1/concurrentMarkThread.hpp	Thu Oct 26 21:30:48 2017 -0700
@@ -55,7 +55,9 @@
   ConcurrentGCPhaseManager::Stack _phase_manager_stack;
 
   void sleepBeforeNextCycle();
+  // Delay marking to meet MMU.
   void delay_to_keep_mmu(G1Policy* g1_policy, bool remark);
+  double mmu_sleep_time(G1Policy* g1_policy, bool remark);
 
   void run_service();
   void stop_service();