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/vm_operations.hpp"
  33 #include "services/diagnosticCommand.hpp"
  34 #include "utilities/resourceHash.hpp"
  35 
  36 
  37 class ClassLoaderStatsDCmd : public DCmd {
  38 public:
  39   ClassLoaderStatsDCmd(outputStream* output, bool heap) :
  40     DCmd(output, heap) {
  41   }
  42 
  43   static const char* name() {
  44     return "VM.classloader_stats";
  45   }
  46 
  47   static const char* description() {
  48     return "Print statistics about all ClassLoaders.";
  49   }
  50 
  51   static const char* impact() {
  52     return "Low";
  53   }
  54 
  55   virtual void execute(DCmdSource source, TRAPS);
  56 
  57   static int num_arguments() {
  58     return 0;
  59   }
  60 
  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 
  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:
  99   static bool oop_equals(oop const& s1, oop const& s2) {
 100     return s1 == s2;
 101   }
 102 
 103   static unsigned oop_hash(oop const& s1) {
 104     unsigned hash = (unsigned)((uintptr_t)&s1);
 105     return hash ^ (hash >> LogMinObjAlignment);
 106   }
 107 
 108   typedef ResourceHashtable<oop, ClassLoaderStats*,
 109       ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable;
 110 
 111   outputStream* _out;
 112   StatsTable* _stats;
 113   uintx   _total_loaders;
 114   uintx   _total_classes;
 115   size_t  _total_chunk_sz;
 116   size_t  _total_block_sz;
 117 
 118 public:
 119   ClassLoaderStatsClosure(outputStream* out) :
 120     _out(out),
 121     _total_loaders(0),
 122     _total_block_sz(0),
 123     _total_chunk_sz(0),
 124     _total_classes(0),
 125     _stats(new StatsTable()) {
 126   }
 127 
 128   virtual void do_cld(ClassLoaderData* cld);
 129   virtual bool do_entry(oop const& key, ClassLoaderStats* const& cls);
 130   void print();
 131 
 132 private:
 133   void addEmptyParents(oop cl);
 134 };
 135 
 136 
 137 class ClassLoaderStatsVMOperation : public VM_Operation {
 138   outputStream* _out;
 139 
 140 public:
 141   ClassLoaderStatsVMOperation(outputStream* out) :
 142     _out(out) {
 143   }
 144 
 145   VMOp_Type type() const {
 146     return VMOp_ClassLoaderStatsOperation;
 147   }
 148 
 149   void doit();
 150 };
 151 
 152 #endif // SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP