1 /*
2 * Copyright (c) 2014, 2019, 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:
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_chunk_sz(0),
92 _anon_block_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 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 _stats(new StatsTable()),
123 _total_loaders(0),
124 _total_classes(0),
125 _total_chunk_sz(0),
126 _total_block_sz(0) {
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_CLASSFILE_CLASSLOADERSTATS_HPP