src/hotspot/share/services/virtualMemoryTracker.cpp

rev 60811 : imported patch jep387-all.patch
rev 60812 : [mq]: diff1

@@ -665,14 +665,13 @@
 
   mss._reserved_in_bytes[type]   = MetaspaceUtils::reserved_bytes(type);
   mss._committed_in_bytes[type]  = MetaspaceUtils::committed_bytes(type);
   mss._used_in_bytes[type]       = MetaspaceUtils::used_bytes(type);
 
-  size_t free_in_bytes = 0;// TODO fix(MetaspaceUtils::capacity_bytes(type) - MetaspaceUtils::used_bytes(type))
-                     //  + MetaspaceUtils::free_chunks_total_bytes(type)
-                     //  + MetaspaceUtils::free_in_vs_bytes(type);
-  mss._free_in_bytes[type] = free_in_bytes;
+  // The answer to "what is free" in metaspace is complex and cannot be answered with a single number.
+  // Free as in available to all loaders? Free, pinned to one loader? For now, keep it simple.
+  mss._free_in_bytes[type] = mss._committed_in_bytes[type] - mss._used_in_bytes[type];
 }
 
 void MetaspaceSnapshot::snapshot(MetaspaceSnapshot& mss) {
   snapshot(Metaspace::ClassType, mss);
   if (Metaspace::using_class_space()) {