7188594: Print statistic collected by NMT with VM flag

Summary: Print out statistics of collected NMT data if it is on at VM exits
Reviewed-by: kvn, coleenp, twisti

src/share/vm/runtime/arguments.cpp

@@ -1978,6 +1978,12 @@ bool Arguments::check_vm_args_consistency() {
   status = status && verify_min_value(ClassMetaspaceSize, 1*M,
                                       "ClassMetaspaceSize");
 
+  // check native memory tracking flags
+  if (PrintNMTStatistics && MemTracker::tracking_level() == MemTracker::NMT_off) {
+    warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
+    PrintNMTStatistics = false;
+  }
+
   return status;
 }
 

src/share/vm/runtime/globals.hpp

@@ -863,6 +863,9 @@ class CommandLineFlags {
   product(ccstr, NativeMemoryTracking, "off",                               \
           "Native memory tracking options")                                 \
                                                                             \
+  diagnostic(bool, PrintNMTStatistics, false,                               \
+          "Print native memory tracking summary data if it is on")          \
+                                                                            \
   diagnostic(bool, LogCompilation, false,                                   \
           "Log compilation activity in detail to hotspot.log or LogFile")   \
                                                                             \

src/share/vm/runtime/java.cpp

@@ -56,6 +56,8 @@
 #include "runtime/task.hpp"
 #include "runtime/timer.hpp"
 #include "runtime/vm_operations.hpp"
+#include "services/memReporter.hpp"
+#include "services/memTracker.hpp"
 #include "trace/tracing.hpp"
 #include "trace/traceEventTypes.hpp"
 #include "utilities/dtrace.hpp"
@@ -359,6 +361,15 @@ void print_statistics() {
   }
 #endif // COMPILER2
 #endif // ENABLE_ZAP_DEAD_LOCALS
+  // Native memory tracking data
+  if (PrintNMTStatistics) {
+    if (MemTracker::is_on()) {
+      BaselineTTYOutputer outputer(tty);
+      MemTracker::print_memory_usage(outputer, K, false);
+    } else {
+      tty->print_cr(MemTracker::reason());
+    }
+  }
 }
 
 #else // PRODUCT MODE STATISTICS
@@ -376,6 +387,16 @@ void print_statistics() {
   if (PrintBiasedLockingStatistics) {
     BiasedLocking::print_counters();
   }
+
+  // Native memory tracking data
+  if (PrintNMTStatistics) {
+    if (MemTracker::is_on()) {
+      BaselineTTYOutputer outputer(tty);
+      MemTracker::print_memory_usage(outputer, K, false);
+    } else {
+      tty->print_cr(MemTracker::reason());
+    }
+  }
 }
 
 #endif

src/share/vm/services/memTracker.hpp

@@ -85,7 +85,7 @@ class MemTracker : AllStatic {
     NMT_shutdown                         // shutdown
   };
 
-
+ public:
   // native memory tracking level
   enum NMTLevel {
     NMT_off,              // native memory tracking is off
@@ -93,7 +93,6 @@ class MemTracker : AllStatic {
     NMT_detail            // track callsite also
   };
 
- public:
    enum ShutdownReason {
      NMT_shutdown_none,     // no shutdown requested
      NMT_shutdown_user,     // user requested shutdown
@@ -117,6 +116,10 @@ class MemTracker : AllStatic {
       _state >= NMT_bootstrapping_single_thread);
   }
 
+  static inline enum NMTLevel tracking_level() {
+    return _tracking_level;
+  }
+
   // user readable reason for shutting down NMT
   static const char* reason() {
     switch(_reason) {