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