--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/classLoaderStats.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2014, 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classLoaderStats.hpp"
+#include "oops/oop.inline.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+
+class ClassStatsClosure : public KlassClosure {
+public:
+  int _num_classes;
+
+  ClassStatsClosure() :
+    _num_classes(0) {
+  }
+
+  virtual void do_klass(Klass* k) {
+    _num_classes++;
+  }
+};
+
+
+void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
+  oop cl = cld->class_loader();
+  ClassLoaderStats* cls;
+
+  // The hashtable key is the ClassLoader oop since we want to account
+  // for "real" classes and anonymous classes together
+  ClassLoaderStats** cls_ptr = _stats->get(cl);
+  if (cls_ptr == NULL) {
+    cls = new ClassLoaderStats();
+    _stats->put(cl, cls);
+    _total_loaders++;
+  } else {
+    cls = *cls_ptr;
+  }
+
+  if (!cld->is_anonymous()) {
+    cls->_cld = cld;
+  }
+
+  cls->_class_loader = cl;
+  if (cl != NULL) {
+    cls->_parent = java_lang_ClassLoader::parent(cl);
+    addEmptyParents(cls->_parent);
+  }
+
+  ClassStatsClosure csc;
+  cld->classes_do(&csc);
+  if(cld->is_anonymous()) {
+    cls->_anon_classes_count += csc._num_classes;
+  } else {
+    cls->_classes_count = csc._num_classes;
+  }
+  _total_classes += csc._num_classes;
+
+  Metaspace* ms = cld->metaspace_or_null();
+  if (ms != NULL) {
+    if(cld->is_anonymous()) {
+      cls->_anon_chunk_sz += ms->allocated_chunks_bytes();
+      cls->_anon_block_sz += ms->allocated_blocks_bytes();
+    } else {
+      cls->_chunk_sz = ms->allocated_chunks_bytes();
+      cls->_block_sz = ms->allocated_blocks_bytes();
+    }
+    _total_chunk_sz += ms->allocated_chunks_bytes();
+    _total_block_sz += ms->allocated_blocks_bytes();
+  }
+}
+
+
+// Handles the difference in pointer width on 32 and 64 bit platforms
+#ifdef _LP64
+  #define SPACE "%8s"
+#else
+  #define SPACE "%s"
+#endif
+
+
+bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
+  Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
+  Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
+
+  _out->print(INTPTR_FORMAT "  " INTPTR_FORMAT "  " INTPTR_FORMAT "  " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
+      p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
+      cls->_classes_count,
+      cls->_chunk_sz, cls->_block_sz);
+  if (class_loader_klass != NULL) {
+    _out->print("%s", class_loader_klass->external_name());
+  } else {
+    _out->print("<boot class loader>");
+  }
+  _out->cr();
+  if (cls->_anon_classes_count > 0) {
+    _out->print_cr(SPACE SPACE SPACE "                                    " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "   + unsafe anonymous classes",
+        "", "", "",
+        cls->_anon_classes_count,
+        cls->_anon_chunk_sz, cls->_anon_block_sz);
+  }
+  return true;
+}
+
+
+void ClassLoaderStatsClosure::print() {
+  _out->print_cr("ClassLoader" SPACE " Parent" SPACE "      CLD*" SPACE "       Classes   ChunkSz   BlockSz  Type", "", "", "");
+  _stats->iterate(this);
+  _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
+  _out->print(SPACE SPACE SPACE "                      ", "", "", "");
+  _out->print_cr(UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
+      _total_classes,
+      _total_chunk_sz,
+      _total_block_sz);
+  _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
+  _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
+}
+
+
+void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
+  while (cl != NULL && java_lang_ClassLoader::loader_data(cl) == NULL) {
+    // This classloader has not loaded any classes
+    ClassLoaderStats** cls_ptr = _stats->get(cl);
+    if (cls_ptr == NULL) {
+      // It does not exist in our table - add it
+      ClassLoaderStats* cls = new ClassLoaderStats();
+      cls->_class_loader = cl;
+      cls->_parent = java_lang_ClassLoader::parent(cl);
+      _stats->put(cl, cls);
+      _total_loaders++;
+    }
+
+    cl = java_lang_ClassLoader::parent(cl);
+  }
+}
+
+
+void ClassLoaderStatsVMOperation::doit() {
+  ClassLoaderStatsClosure clsc (_out);
+  ClassLoaderDataGraph::cld_do(&clsc);
+  clsc.print();
+}
+
+
+void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
+  ClassLoaderStatsVMOperation op(output());
+  VMThread::execute(&op);
+}