1 /*
   2  * Copyright (c) 2014, 2018, 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/oop.hpp"
  32 #include "oops/oopsHierarchy.hpp"
  33 #include "runtime/vm_operations.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   ClassLoaderStats() :
  85     _cld(0),
  86     _class_loader(0),
  87     _parent(0),
  88     _chunk_sz(0),
  89     _block_sz(0),
  90     _classes_count(0),
  91     _anon_block_sz(0),
  92     _anon_chunk_sz(0),
  93     _anon_classes_count(0) {
  94   }
  95 };
  96 
  97 
  98 class ClassLoaderStatsClosure : public CLDClosure {
  99 protected:
 100   static bool oop_equals(oop const& s1, oop const& s2) {
 101     return oopDesc::equals(s1, s2);
 102   }
 103 
 104   static unsigned oop_hash(oop const& s1) {
 105     unsigned hash = (unsigned)((uintptr_t)&s1);
 106     return hash ^ (hash >> LogMinObjAlignment);
 107   }
 108 
 109   typedef ResourceHashtable<oop, ClassLoaderStats*,
 110       ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable;
 111 
 112   outputStream* _out;
 113   StatsTable* _stats;
 114   uintx   _total_loaders;
 115   uintx   _total_classes;
 116   size_t  _total_chunk_sz;
 117   size_t  _total_block_sz;
 118 
 119 public:
 120   ClassLoaderStatsClosure(outputStream* out) :
 121     _out(out),
 122     _total_loaders(0),
 123     _total_block_sz(0),
 124     _total_chunk_sz(0),
 125     _total_classes(0),
 126     _stats(new StatsTable()) {
 127   }
 128 
 129   virtual void do_cld(ClassLoaderData* cld);
 130   virtual bool do_entry(oop const& key, ClassLoaderStats* const& cls);
 131   void print();
 132 
 133 private:
 134   void addEmptyParents(oop cl);
 135 };
 136 
 137 
 138 class ClassLoaderStatsVMOperation : public VM_Operation {
 139   outputStream* _out;
 140 
 141 public:
 142   ClassLoaderStatsVMOperation(outputStream* out) :
 143     _out(out) {
 144   }
 145 
 146   VMOp_Type type() const {
 147     return VMOp_ClassLoaderStatsOperation;
 148   }
 149 
 150   void doit();
 151 };
 152 
 153 #endif // SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP