src/hotspot/share/classfile/classLoaderStats.cpp
author coleenp
Fri, 28 Sep 2018 16:07:39 -0400
changeset 51959 db0c3952de52
parent 51698 74dde8b66b7f
child 52586 74109912c738
permissions -rw-r--r--
8209645: Split ClassLoaderData and ClassLoaderDataGraph into separate files Reviewed-by: iklam, stuefe
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/*
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 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/classLoaderDataGraph.hpp"
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#include "classfile/classLoaderStats.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/globalDefinitions.hpp"
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class ClassStatsClosure : public KlassClosure {
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public:
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  int _num_classes;
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  ClassStatsClosure() :
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    _num_classes(0) {
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  }
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  virtual void do_klass(Klass* k) {
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    _num_classes++;
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  }
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};
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void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
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  oop cl = cld->class_loader();
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  ClassLoaderStats* cls;
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  // The hashtable key is the ClassLoader oop since we want to account
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  // for "real" classes and anonymous classes together
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  ClassLoaderStats** cls_ptr = _stats->get(cl);
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  if (cls_ptr == NULL) {
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    cls = new ClassLoaderStats();
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    _stats->put(cl, cls);
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    _total_loaders++;
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  } else {
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    cls = *cls_ptr;
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  }
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  if (!cld->is_unsafe_anonymous()) {
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    cls->_cld = cld;
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  }
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  cls->_class_loader = cl;
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  if (cl != NULL) {
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    cls->_parent = java_lang_ClassLoader::parent(cl);
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    addEmptyParents(cls->_parent);
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  }
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  ClassStatsClosure csc;
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  cld->classes_do(&csc);
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  if(cld->is_unsafe_anonymous()) {
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    cls->_anon_classes_count += csc._num_classes;
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  } else {
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    cls->_classes_count = csc._num_classes;
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  }
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  _total_classes += csc._num_classes;
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  ClassLoaderMetaspace* ms = cld->metaspace_or_null();
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  if (ms != NULL) {
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    if(cld->is_unsafe_anonymous()) {
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      cls->_anon_chunk_sz += ms->allocated_chunks_bytes();
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      cls->_anon_block_sz += ms->allocated_blocks_bytes();
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    } else {
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      cls->_chunk_sz = ms->allocated_chunks_bytes();
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      cls->_block_sz = ms->allocated_blocks_bytes();
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    }
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    _total_chunk_sz += ms->allocated_chunks_bytes();
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    _total_block_sz += ms->allocated_blocks_bytes();
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  }
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}
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// Handles the difference in pointer width on 32 and 64 bit platforms
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#ifdef _LP64
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  #define SPACE "%8s"
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#else
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  #define SPACE "%s"
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#endif
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bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
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  Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
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  Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
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  _out->print(INTPTR_FORMAT "  " INTPTR_FORMAT "  " INTPTR_FORMAT "  " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
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      p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
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      cls->_classes_count,
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      cls->_chunk_sz, cls->_block_sz);
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  if (class_loader_klass != NULL) {
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    _out->print("%s", class_loader_klass->external_name());
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  } else {
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    _out->print("<boot class loader>");
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  }
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  _out->cr();
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  if (cls->_anon_classes_count > 0) {
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    _out->print_cr(SPACE SPACE SPACE "                                    " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "   + unsafe anonymous classes",
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        "", "", "",
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        cls->_anon_classes_count,
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        cls->_anon_chunk_sz, cls->_anon_block_sz);
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  }
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  return true;
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}
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void ClassLoaderStatsClosure::print() {
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  _out->print_cr("ClassLoader" SPACE " Parent" SPACE "      CLD*" SPACE "       Classes   ChunkSz   BlockSz  Type", "", "", "");
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  _stats->iterate(this);
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  _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
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  _out->print(SPACE SPACE SPACE "                      ", "", "", "");
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  _out->print_cr(UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",
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      _total_classes,
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      _total_chunk_sz,
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      _total_block_sz);
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  _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
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  _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
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}
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void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
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  while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {
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    // This classloader has not loaded any classes
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    ClassLoaderStats** cls_ptr = _stats->get(cl);
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    if (cls_ptr == NULL) {
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      // It does not exist in our table - add it
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      ClassLoaderStats* cls = new ClassLoaderStats();
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      cls->_class_loader = cl;
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      cls->_parent = java_lang_ClassLoader::parent(cl);
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      _stats->put(cl, cls);
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      _total_loaders++;
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    }
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    cl = java_lang_ClassLoader::parent(cl);
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  }
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}
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void ClassLoaderStatsVMOperation::doit() {
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  ClassLoaderStatsClosure clsc (_out);
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  ClassLoaderDataGraph::cld_do(&clsc);
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  clsc.print();
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}
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void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
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  ClassLoaderStatsVMOperation op(output());
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  VMThread::execute(&op);
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}