1 /* 2 * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_CLASSFILE_CLASSLOADERSTATS_HPP 26 #define SHARE_CLASSFILE_CLASSLOADERSTATS_HPP 27 28 29 #include "classfile/classLoaderData.hpp" 30 #include "oops/klass.hpp" 31 #include "oops/oop.hpp" 32 #include "oops/oopsHierarchy.hpp" 33 #include "runtime/vmOperations.hpp" 34 #include "services/diagnosticCommand.hpp" 35 #include "utilities/resourceHash.hpp" 36 37 38 class ClassLoaderStatsDCmd : public DCmd { 39 public: 40 ClassLoaderStatsDCmd(outputStream* output, bool heap) : 41 DCmd(output, heap) { 42 } 43 44 static const char* name() { 45 return "VM.classloader_stats"; 46 } 47 48 static const char* description() { 49 return "Print statistics about all ClassLoaders."; 50 } 51 52 static const char* impact() { 53 return "Low"; 54 } 55 56 virtual void execute(DCmdSource source, TRAPS); 57 58 static int num_arguments() { 59 return 0; 60 } 61 62 static const JavaPermission permission() { 63 JavaPermission p = {"java.lang.management.ManagementPermission", 64 "monitor", NULL}; 65 return p; 66 } 67 }; 68 69 70 class ClassLoaderStats : public ResourceObj { 71 public: 72 ClassLoaderData* _cld; 73 oop _class_loader; 74 oop _parent; 75 76 size_t _chunk_sz; 77 size_t _block_sz; 78 uintx _classes_count; 79 80 size_t _anon_chunk_sz; 81 size_t _anon_block_sz; 82 uintx _anon_classes_count; 83 84 size_t _hidden_chunk_sz; 85 size_t _hidden_block_sz; 86 uintx _hidden_classes_count; 87 88 ClassLoaderStats() : 89 _cld(0), 90 _class_loader(0), 91 _parent(0), 92 _chunk_sz(0), 93 _block_sz(0), 94 _classes_count(0), 95 _anon_chunk_sz(0), 96 _anon_block_sz(0), 97 _anon_classes_count(0), 98 _hidden_chunk_sz(0), 99 _hidden_block_sz(0), 100 _hidden_classes_count(0) { 101 } 102 }; 103 104 105 class ClassLoaderStatsClosure : public CLDClosure { 106 protected: 107 static bool oop_equals(oop const& s1, oop const& s2) { 108 return s1 == s2; 109 } 110 111 static unsigned oop_hash(oop const& s1) { 112 unsigned hash = (unsigned)((uintptr_t)&s1); 113 return hash ^ (hash >> LogMinObjAlignment); 114 } 115 116 typedef ResourceHashtable<oop, ClassLoaderStats*, 117 ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable; 118 119 outputStream* _out; 120 StatsTable* _stats; 121 uintx _total_loaders; 122 uintx _total_classes; 123 size_t _total_chunk_sz; 124 size_t _total_block_sz; 125 126 public: 127 ClassLoaderStatsClosure(outputStream* out) : 128 _out(out), 129 _stats(new StatsTable()), 130 _total_loaders(0), 131 _total_classes(0), 132 _total_chunk_sz(0), 133 _total_block_sz(0) { 134 } 135 136 virtual void do_cld(ClassLoaderData* cld); 137 virtual bool do_entry(oop const& key, ClassLoaderStats* const& cls); 138 void print(); 139 140 private: 141 void addEmptyParents(oop cl); 142 }; 143 144 145 class ClassLoaderStatsVMOperation : public VM_Operation { 146 outputStream* _out; 147 148 public: 149 ClassLoaderStatsVMOperation(outputStream* out) : 150 _out(out) { 151 } 152 153 VMOp_Type type() const { 154 return VMOp_ClassLoaderStatsOperation; 155 } 156 157 void doit(); 158 }; 159 160 #endif // SHARE_CLASSFILE_CLASSLOADERSTATS_HPP