8260571: Add PrintMetaspaceStatistics to print metaspace statistics upon VM exit

Reviewed-by: clanger
Backport-of: ddd2951

Author: tstuefe

src/hotspot/share/runtime/globals.hpp

@@ -1824,6 +1824,9 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
           "class pointers are used")                                        \
           range(1*M, 3*G)                                                   \
                                                                             \
+  diagnostic(bool, PrintMetaspaceStatisticsAtExit, false,                   \
+          "Print metaspace statistics upon VM exit.")                       \
+                                                                            \
   manageable(uintx, MinHeapFreeRatio, 40,                                   \
           "The minimum percentage of heap free after GC to avoid expansion."\
           " For most GCs this applies to the old generation. In G1 and"     \

src/hotspot/share/runtime/java.cpp

@@ -380,6 +380,10 @@ void print_statistics() {
     MemTracker::final_report(tty);
   }
 
+  if (PrintMetaspaceStatisticsAtExit) {
+    MetaspaceUtils::print_basic_report(tty, 0);
+  }
+
   ThreadsSMRSupport::log_statistics();
 }
 
@@ -423,6 +427,10 @@ void print_statistics() {
     MemTracker::final_report(tty);
   }
 
+  if (PrintMetaspaceStatisticsAtExit) {
+    MetaspaceUtils::print_basic_report(tty, 0);
+  }
+
   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
     Method::print_touched_methods(tty);
   }