--- old/src/hotspot/share/runtime/synchronizer.hpp	2020-07-13 15:31:54.000000000 -0400
+++ new/src/hotspot/share/runtime/synchronizer.hpp	2020-07-13 15:31:53.000000000 -0400
@@ -42,14 +42,6 @@
 
 typedef PaddedEnd<ObjectMonitor, OM_CACHE_LINE_SIZE> PaddedObjectMonitor;
 
-struct DeflateMonitorCounters {
-  volatile int n_in_use;              // currently associated with objects
-  volatile int n_in_circulation;      // extant
-  volatile int n_scavenged;           // reclaimed (global and per-thread)
-  volatile int per_thread_scavenged;  // per-thread scavenge total
-           double per_thread_times;   // per-thread scavenge times
-};
-
 class ObjectSynchronizer : AllStatic {
   friend class VMStructs;
  public:
@@ -131,20 +123,11 @@
   // GC: we current use aggressive monitor deflation policy
   // Basically we deflate all monitors that are not busy.
   // An adaptive profile-based deflation policy could be used if needed
-  static void deflate_idle_monitors(DeflateMonitorCounters* counters);
   static void deflate_idle_monitors_using_JT();
   static void deflate_global_idle_monitors_using_JT();
   static void deflate_per_thread_idle_monitors_using_JT(JavaThread* target);
   static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread* target);
-  static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
-  static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
-  static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
-
-  // For a given monitor list: global or per-thread, deflate idle monitors
-  static int deflate_monitor_list(ObjectMonitor** list_p,
-                                  int* count_p,
-                                  ObjectMonitor** free_head_p,
-                                  ObjectMonitor** free_tail_p);
+
   // For a given in-use monitor list: global or per-thread, deflate idle
   // monitors using a JavaThread.
   static int deflate_monitor_list_using_JT(ObjectMonitor** list_p,
@@ -152,14 +135,10 @@
                                            ObjectMonitor** free_head_p,
                                            ObjectMonitor** free_tail_p,
                                            ObjectMonitor** saved_mid_in_use_p);
-  static bool deflate_monitor(ObjectMonitor* mid, oop obj,
-                              ObjectMonitor** free_head_p,
-                              ObjectMonitor** free_tail_p);
   static bool deflate_monitor_using_JT(ObjectMonitor* mid,
                                        ObjectMonitor** free_head_p,
                                        ObjectMonitor** free_tail_p);
   static bool is_async_deflation_needed();
-  static bool is_safepoint_deflation_needed();
   static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
   static jlong last_async_deflation_time_ns() { return _last_async_deflation_time_ns; }
   static bool request_deflate_idle_monitors();  // for whitebox test support and VM exit logging
@@ -191,7 +170,7 @@
   static int  log_monitor_list_counts(outputStream * out);
   static int  verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
 
-  static void do_safepoint_work(DeflateMonitorCounters* counters);
+  static void do_safepoint_work();
 
  private:
   friend class SynchronizerTest;