--- old/src/hotspot/share/utilities/hashtable.inline.hpp	2019-09-26 22:30:01.730307209 +0800
+++ new/src/hotspot/share/utilities/hashtable.inline.hpp	2019-09-26 22:30:01.580301985 +0800
@@ -43,6 +43,7 @@
   for (int index = 0; index < _table_size; index++) {
     _buckets[index].clear();
   }
+  _stats_rate = TableRateStatistics();
 }
 
 
@@ -52,6 +53,7 @@
   // Called on startup, no locking needed
   initialize(table_size, entry_size, number_of_entries);
   _buckets = buckets;
+  _stats_rate = TableRateStatistics();
 }
 
 
@@ -93,6 +95,11 @@
 
 template <MEMFLAGS F> inline void BasicHashtable<F>::set_entry(int index, BasicHashtableEntry<F>* entry) {
   _buckets[index].set_entry(entry);
+  if (entry != NULL) {
+    JFR_ONLY(_stats_rate.add();)
+  } else {
+    JFR_ONLY(_stats_rate.remove();)
+  }
 }
 
 
@@ -100,12 +107,14 @@
   entry->set_next(bucket(index));
   _buckets[index].set_entry(entry);
   ++_number_of_entries;
+  JFR_ONLY(_stats_rate.add();)
 }
 
 template <MEMFLAGS F> inline void BasicHashtable<F>::free_entry(BasicHashtableEntry<F>* entry) {
   entry->set_next(_free_list);
   _free_list = entry;
   --_number_of_entries;
+  JFR_ONLY(_stats_rate.remove();)
 }
 
 #endif // SHARE_VM_UTILITIES_HASHTABLE_INLINE_HPP