163 lines
4.1 KiB
C++
163 lines
4.1 KiB
C++
/*
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* Copyright (c) 2014, 2020, 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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#ifndef SHARE_CLASSFILE_CLASSLOADERSTATS_HPP
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#define SHARE_CLASSFILE_CLASSLOADERSTATS_HPP
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#include "classfile/classLoaderData.hpp"
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#include "oops/klass.hpp"
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#include "oops/oop.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include "runtime/vmOperations.hpp"
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#include "services/diagnosticCommand.hpp"
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#include "utilities/resourceHash.hpp"
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class ClassLoaderStatsDCmd : public DCmd {
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public:
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ClassLoaderStatsDCmd(outputStream* output, bool heap) :
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DCmd(output, heap) {
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}
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static const char* name() {
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return "VM.classloader_stats";
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}
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static const char* description() {
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return "Print statistics about all ClassLoaders.";
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}
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static const char* impact() {
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return "Low";
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}
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virtual void execute(DCmdSource source, TRAPS);
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static int num_arguments() {
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return 0;
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}
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static const JavaPermission permission() {
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JavaPermission p = {"java.lang.management.ManagementPermission",
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"monitor", NULL};
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return p;
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}
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};
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class ClassLoaderStats : public ResourceObj {
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public:
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ClassLoaderData* _cld;
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oop _class_loader;
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oop _parent;
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size_t _chunk_sz;
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size_t _block_sz;
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uintx _classes_count;
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size_t _hidden_chunk_sz;
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size_t _hidden_block_sz;
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uintx _hidden_classes_count;
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ClassLoaderStats() :
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_cld(0),
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_class_loader(0),
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_parent(0),
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_chunk_sz(0),
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_block_sz(0),
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_classes_count(0),
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_hidden_chunk_sz(0),
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_hidden_block_sz(0),
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_hidden_classes_count(0) {
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}
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};
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class ClassLoaderStatsClosure : public CLDClosure {
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protected:
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static bool oop_equals(oop const& s1, oop const& s2) {
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return s1 == s2;
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}
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static unsigned oop_hash(oop const& s1) {
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// Robert Jenkins 1996 & Thomas Wang 1997
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// http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
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uintptr_t tmp = cast_from_oop<uintptr_t>(s1);
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unsigned hash = (unsigned)tmp;
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hash = ~hash + (hash << 15);
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hash = hash ^ (hash >> 12);
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hash = hash + (hash << 2);
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hash = hash ^ (hash >> 4);
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hash = hash * 2057;
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hash = hash ^ (hash >> 16);
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return hash;
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}
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typedef ResourceHashtable<oop, ClassLoaderStats,
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ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable;
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outputStream* _out;
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StatsTable* _stats;
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uintx _total_loaders;
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uintx _total_classes;
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size_t _total_chunk_sz;
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size_t _total_block_sz;
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public:
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ClassLoaderStatsClosure(outputStream* out) :
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_out(out),
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_stats(new StatsTable()),
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_total_loaders(0),
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_total_classes(0),
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_total_chunk_sz(0),
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_total_block_sz(0) {
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}
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virtual void do_cld(ClassLoaderData* cld);
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virtual bool do_entry(oop const& key, ClassLoaderStats const& cls);
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void print();
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private:
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void addEmptyParents(oop cl);
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};
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class ClassLoaderStatsVMOperation : public VM_Operation {
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outputStream* _out;
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public:
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ClassLoaderStatsVMOperation(outputStream* out) :
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_out(out) {
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}
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VMOp_Type type() const {
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return VMOp_ClassLoaderStatsOperation;
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}
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void doit();
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};
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#endif // SHARE_CLASSFILE_CLASSLOADERSTATS_HPP
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