1 /* 2 * Copyright (c) 2014, 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_VM_CLASSFILE_CLASSLOADERSTATS_HPP 26 #define SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP 27 28 29 #include "classfile/classLoaderData.hpp" 30 #include "oops/klass.hpp" 31 #include "oops/oopsHierarchy.hpp" 32 #include "runtime/vmOperations.hpp" 33 #include "services/diagnosticCommand.hpp" 34 #include "utilities/resourceHash.hpp" 35 36 37 class ClassLoaderStatsDCmd : public DCmd { 38 public: ClassLoaderStatsDCmd(outputStream * output,bool heap)39 ClassLoaderStatsDCmd(outputStream* output, bool heap) : 40 DCmd(output, heap) { 41 } 42 name()43 static const char* name() { 44 return "VM.classloader_stats"; 45 } 46 description()47 static const char* description() { 48 return "Print statistics about all ClassLoaders."; 49 } 50 impact()51 static const char* impact() { 52 return "Low"; 53 } 54 55 virtual void execute(DCmdSource source, TRAPS); 56 num_arguments()57 static int num_arguments() { 58 return 0; 59 } 60 permission()61 static const JavaPermission permission() { 62 JavaPermission p = {"java.lang.management.ManagementPermission", 63 "monitor", NULL}; 64 return p; 65 } 66 }; 67 68 69 class ClassLoaderStats : public ResourceObj { 70 public: 71 ClassLoaderData* _cld; 72 oop _class_loader; 73 oop _parent; 74 75 size_t _chunk_sz; 76 size_t _block_sz; 77 uintx _classes_count; 78 79 size_t _anon_chunk_sz; 80 size_t _anon_block_sz; 81 uintx _anon_classes_count; 82 ClassLoaderStats()83 ClassLoaderStats() : 84 _cld(0), 85 _class_loader(0), 86 _parent(0), 87 _chunk_sz(0), 88 _block_sz(0), 89 _classes_count(0), 90 _anon_block_sz(0), 91 _anon_chunk_sz(0), 92 _anon_classes_count(0) { 93 } 94 }; 95 96 97 class ClassLoaderStatsClosure : public CLDClosure { 98 protected: oop_equals(oop const & s1,oop const & s2)99 static bool oop_equals(oop const& s1, oop const& s2) { 100 return s1 == s2; 101 } 102 oop_hash(oop const & s1)103 static unsigned oop_hash(oop const& s1) { 104 // Robert Jenkins 1996 & Thomas Wang 1997 105 // http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm 106 uintptr_t tmp = cast_from_oop<uintptr_t>(s1); 107 unsigned hash = (unsigned)tmp; 108 hash = ~hash + (hash << 15); 109 hash = hash ^ (hash >> 12); 110 hash = hash + (hash << 2); 111 hash = hash ^ (hash >> 4); 112 hash = hash * 2057; 113 hash = hash ^ (hash >> 16); 114 return hash; 115 } 116 117 typedef ResourceHashtable<oop, ClassLoaderStats*, 118 ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable; 119 120 outputStream* _out; 121 StatsTable* _stats; 122 uintx _total_loaders; 123 uintx _total_classes; 124 size_t _total_chunk_sz; 125 size_t _total_block_sz; 126 127 public: ClassLoaderStatsClosure(outputStream * out)128 ClassLoaderStatsClosure(outputStream* out) : 129 _out(out), 130 _total_loaders(0), 131 _total_block_sz(0), 132 _total_chunk_sz(0), 133 _total_classes(0), 134 _stats(new StatsTable()) { 135 } 136 137 virtual void do_cld(ClassLoaderData* cld); 138 virtual bool do_entry(oop const& key, ClassLoaderStats* const& cls); 139 void print(); 140 141 private: 142 void addEmptyParents(oop cl); 143 }; 144 145 146 class ClassLoaderStatsVMOperation : public VM_Operation { 147 outputStream* _out; 148 149 public: ClassLoaderStatsVMOperation(outputStream * out)150 ClassLoaderStatsVMOperation(outputStream* out) : 151 _out(out) { 152 } 153 type() const154 VMOp_Type type() const { 155 return VMOp_ClassLoaderStatsOperation; 156 } 157 158 void doit(); 159 }; 160 161 #endif // SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP 162