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: ClassLoaderStatsDCmd(outputStream * output,bool heap)40 ClassLoaderStatsDCmd(outputStream* output, bool heap) : 41 DCmd(output, heap) { 42 } 43 name()44 static const char* name() { 45 return "VM.classloader_stats"; 46 } 47 description()48 static const char* description() { 49 return "Print statistics about all ClassLoaders."; 50 } 51 impact()52 static const char* impact() { 53 return "Low"; 54 } 55 56 virtual void execute(DCmdSource source, TRAPS); 57 num_arguments()58 static int num_arguments() { 59 return 0; 60 } 61 permission()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 _hidden_chunk_sz; 81 size_t _hidden_block_sz; 82 uintx _hidden_classes_count; 83 ClassLoaderStats()84 ClassLoaderStats() : 85 _cld(0), 86 _class_loader(0), 87 _parent(0), 88 _chunk_sz(0), 89 _block_sz(0), 90 _classes_count(0), 91 _hidden_chunk_sz(0), 92 _hidden_block_sz(0), 93 _hidden_classes_count(0) { 94 } 95 }; 96 97 98 class ClassLoaderStatsClosure : public CLDClosure { 99 protected: oop_equals(oop const & s1,oop const & s2)100 static bool oop_equals(oop const& s1, oop const& s2) { 101 return s1 == s2; 102 } 103 oop_hash(oop const & s1)104 static unsigned oop_hash(oop const& s1) { 105 // Robert Jenkins 1996 & Thomas Wang 1997 106 // http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm 107 uintptr_t tmp = cast_from_oop<uintptr_t>(s1); 108 unsigned hash = (unsigned)tmp; 109 hash = ~hash + (hash << 15); 110 hash = hash ^ (hash >> 12); 111 hash = hash + (hash << 2); 112 hash = hash ^ (hash >> 4); 113 hash = hash * 2057; 114 hash = hash ^ (hash >> 16); 115 return hash; 116 } 117 118 typedef ResourceHashtable<oop, ClassLoaderStats, 119 ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable; 120 121 outputStream* _out; 122 StatsTable* _stats; 123 uintx _total_loaders; 124 uintx _total_classes; 125 size_t _total_chunk_sz; 126 size_t _total_block_sz; 127 128 public: ClassLoaderStatsClosure(outputStream * out)129 ClassLoaderStatsClosure(outputStream* out) : 130 _out(out), 131 _stats(new StatsTable()), 132 _total_loaders(0), 133 _total_classes(0), 134 _total_chunk_sz(0), 135 _total_block_sz(0) { 136 } 137 138 virtual void do_cld(ClassLoaderData* cld); 139 virtual bool do_entry(oop const& key, ClassLoaderStats const& cls); 140 void print(); 141 142 private: 143 void addEmptyParents(oop cl); 144 }; 145 146 147 class ClassLoaderStatsVMOperation : public VM_Operation { 148 outputStream* _out; 149 150 public: ClassLoaderStatsVMOperation(outputStream * out)151 ClassLoaderStatsVMOperation(outputStream* out) : 152 _out(out) { 153 } 154 type() const155 VMOp_Type type() const { 156 return VMOp_ClassLoaderStatsOperation; 157 } 158 159 void doit(); 160 }; 161 162 #endif // SHARE_CLASSFILE_CLASSLOADERSTATS_HPP 163