8277946: NMT: Remove VM.native_memory shutdown jcmd command option

Reviewed-by: mbaesken
Backport-of: abaa073bcbdb202658c8a97401ffb098d71e0f16

src/hotspot/share/services/nmtDCmd.cpp

@@ -50,8 +50,7 @@ NMTDCmd::NMTDCmd(outputStream* output,
             "comparison against previous baseline, which shows the memory " \
             "allocation activities at different callsites.",
             "BOOLEAN", false, "false"),
-  _shutdown("shutdown", "request runtime to shutdown itself and free the " \
-            "memory used by runtime.",
+  _shutdown("shutdown", "deprecated.",
             "BOOLEAN", false, "false"),
   _statistics("statistics", "print tracker statistics for tuning purpose.", \
             "BOOLEAN", false, "false"),
@@ -148,8 +147,7 @@ void NMTDCmd::execute(DCmdSource source, TRAPS) {
       output()->print_cr("No detail baseline for comparison");
     }
   } else if (_shutdown.value()) {
-    MemTracker::shutdown();
-    output()->print_cr("Native memory tracking has been turned off");
+    output()->print_cr("This option is deprecated and will be ignored.");
   } else if (_statistics.value()) {
     if (check_detail_tracking_level(output())) {
       MemTracker::tuning_statistics(output());

test/hotspot/jtreg/runtime/NMT/JcmdWithNMTDisabled.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2021, 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
@@ -72,7 +72,6 @@ public static void main(String args[]) throws Exception {
     jcmdCommand("summary.diff");
     jcmdCommand("detail.diff");
     jcmdCommand("scale=GB");
-    jcmdCommand("shutdown");
   }
 
   // Helper method for invoking different jcmd calls, all should fail with the same message saying NMT is not enabled