--- old/src/hotspot/share/gc/shared/adaptiveSizePolicy.cpp	2018-12-12 17:24:02.061929616 +0800
+++ new/src/hotspot/share/gc/shared/adaptiveSizePolicy.cpp	2018-12-12 17:24:01.853931642 +0800
@@ -53,8 +53,6 @@
     _gc_pause_goal_sec(gc_pause_goal_sec),
     _young_gen_change_for_minor_throughput(0),
     _old_gen_change_for_major_throughput(0) {
-  assert(AdaptiveSizePolicyGCTimeLimitThreshold > 0,
-    "No opportunity to clear SoftReferences before GC overhead limit");
   _avg_minor_pause    =
     new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding);
   _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
@@ -273,7 +271,7 @@
   set_decide_at_full_gc(0);
 }
 
-class AdaptiveSizePolicyTimeOverheadTester: public OverheadTester {
+class AdaptiveSizePolicyTimeOverheadTester: public GCOverheadTester {
   double _gc_cost;
 
  public:
@@ -289,7 +287,7 @@
   }
 };
 
-class AdaptiveSizePolicySpaceOverheadTester: public OverheadTester {
+class AdaptiveSizePolicySpaceOverheadTester: public GCOverheadTester {
   size_t _eden_live;
   size_t _max_old_gen_size;
   size_t _max_eden_size;
@@ -359,7 +357,6 @@
     return free_in_old_gen < (size_t)mem_free_old_limit &&
            free_in_eden < (size_t)mem_free_eden_limit;
   }
-
 };
 
 void AdaptiveSizePolicy::check_gc_overhead_limit(