--- a/src/hotspot/share/runtime/arguments.cpp	Fri Feb 23 10:14:23 2018 -0800
+++ b/src/hotspot/share/runtime/arguments.cpp	Fri Feb 23 14:13:06 2018 -0500
@@ -530,6 +530,7 @@
   { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "PrintMallocFree",               JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "PrintMalloc",                   JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
+  { "ShowSafepointMsgs",             JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "FastTLABRefill",                JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },

--- a/src/hotspot/share/runtime/globals.hpp	Fri Feb 23 10:14:23 2018 -0800
+++ b/src/hotspot/share/runtime/globals.hpp	Fri Feb 23 14:13:06 2018 -0500
@@ -842,9 +842,6 @@
   product(bool, FailOverToOldVerifier, true,                                \
           "Fail over to old verifier when split verifier fails")            \
                                                                             \
-  develop(bool, ShowSafepointMsgs, false,                                   \
-          "Show message about safepoint synchronization")                   \
-                                                                            \
   product(bool, SafepointTimeout, false,                                    \
           "Time out and warn or fail after SafepointTimeoutDelay "          \
           "milliseconds if failed to reach safepoint")                      \

--- a/src/hotspot/share/runtime/safepoint.cpp	Fri Feb 23 10:14:23 2018 -0800
+++ b/src/hotspot/share/runtime/safepoint.cpp	Fri Feb 23 14:13:06 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -893,10 +893,6 @@
     assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization");
   }
 
-  if (ShowSafepointMsgs) {
-    tty->print("handle_polling_page_exception: ");
-  }
-
   if (PrintSafepointStatistics) {
     inc_page_trap_count();
   }
@@ -1098,9 +1094,6 @@
          "polling page exception on thread not running state: %u", uint(t));
 
   // Step 1: Find the nmethod from the return address
-  if (ShowSafepointMsgs && Verbose) {
-    tty->print_cr("Polling page exception at " INTPTR_FORMAT, p2i(thread()->saved_exception_pc()));
-  }
   address real_return_addr = thread()->saved_exception_pc();
 
   CodeBlob *cb = CodeCache::find_blob(real_return_addr);
@@ -1421,32 +1414,3 @@
                 INT64_FORMAT_W(5) " ms",
                 (int64_t)(_max_vmop_time / MICROUNITS));
 }
-
-// ------------------------------------------------------------------------------------------------
-// Non-product code
-
-#ifndef PRODUCT
-
-void SafepointSynchronize::print_state() {
-  if (_state == _not_synchronized) {
-    tty->print_cr("not synchronized");
-  } else if (_state == _synchronizing || _state == _synchronized) {
-    tty->print_cr("State: %s", (_state == _synchronizing) ? "synchronizing" :
-                  "synchronized");
-
-    for (JavaThreadIteratorWithHandle jtiwh; JavaThread *cur = jtiwh.next(); ) {
-       cur->safepoint_state()->print();
-    }
-  }
-}
-
-void SafepointSynchronize::safepoint_msg(const char* format, ...) {
-  if (ShowSafepointMsgs) {
-    va_list ap;
-    va_start(ap, format);
-    tty->vprint_cr(format, ap);
-    va_end(ap);
-  }
-}
-
-#endif // !PRODUCT

--- a/src/hotspot/share/runtime/safepoint.hpp	Fri Feb 23 10:14:23 2018 -0800
+++ b/src/hotspot/share/runtime/safepoint.hpp	Fri Feb 23 14:13:06 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -191,10 +191,6 @@
   static bool is_cleanup_needed();
   static void do_cleanup_tasks();
 
-  // Debugging
-  static void print_state()                                PRODUCT_RETURN;
-  static void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(1, 2) PRODUCT_RETURN;
-
   static void deferred_initialize_stat();
   static void print_stat_on_exit();
   inline static void inc_vmop_coalesced_count() { _coalesced_vmop_count++; }
@@ -258,15 +254,6 @@
   // Initialize
   static void create(JavaThread *thread);
   static void destroy(JavaThread *thread);
-
-  void safepoint_msg(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
-    if (ShowSafepointMsgs) {
-      va_list ap;
-      va_start(ap, format);
-      tty->vprint_cr(format, ap);
-      va_end(ap);
-    }
-  }
 };
 
 

--- a/src/hotspot/share/utilities/debug.cpp	Fri Feb 23 10:14:23 2018 -0800
+++ b/src/hotspot/share/utilities/debug.cpp	Fri Feb 23 14:13:06 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -503,12 +503,6 @@
   SystemDictionary::print();
 }
 
-
-extern "C" void safepoints() {
-  Command c("safepoints");
-  SafepointSynchronize::print_state();
-}
-
 #endif // !PRODUCT
 
 extern "C" void pss() { // print all stacks