1 /*
2 * Copyright (c) 2014, 2020, 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 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.inline.hpp"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "classfile/classLoaderStats.hpp"
29 #include "memory/metaspace.hpp"
30 #include "oops/objArrayKlass.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "utilities/globalDefinitions.hpp"
33
34
35 class ClassStatsClosure : public KlassClosure {
36 public:
37 int _num_classes;
38
39 ClassStatsClosure() :
40 _num_classes(0) {
41 }
42
43 virtual void do_klass(Klass* k) {
44 _num_classes++;
45 }
46 };
47
48 void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
49 oop cl = cld->class_loader();
50
51 // The hashtable key is the ClassLoader oop since we want to account
52 // for "real" classes and anonymous classes together
53 bool added = false;
54 ClassLoaderStats* cls = _stats->put_if_absent(cl, &added);
55 if (added) {
56 cls->_class_loader = cl;
57 _total_loaders++;
58 }
59 assert(cls->_class_loader == cl, "Sanity");
60
61 if (!cld->has_class_mirror_holder()) {
62 cls->_cld = cld;
63 }
64
65 if (cl != NULL) {
66 cls->_parent = java_lang_ClassLoader::parent(cl);
67 addEmptyParents(cls->_parent);
68 }
69
70 ClassStatsClosure csc;
71 cld->classes_do(&csc);
72 bool is_hidden = false;
73 if(cld->has_class_mirror_holder()) {
74 // If cld has a class holder then it must be either hidden or unsafe anonymous.
75 // Either way, count it as a hidden class.
76 cls->_hidden_classes_count += csc._num_classes;
77 } else {
78 cls->_classes_count = csc._num_classes;
79 }
80 _total_classes += csc._num_classes;
81
82 ClassLoaderMetaspace* ms = cld->metaspace_or_null();
83 if (ms != NULL) {
84 size_t used_bytes, capacity_bytes;
85 ms->calculate_jfr_stats(&used_bytes, &capacity_bytes);
86 if(cld->has_class_mirror_holder()) {
87 cls->_hidden_chunk_sz += capacity_bytes;
88 cls->_hidden_block_sz += used_bytes;
89 } else {
90 cls->_chunk_sz = capacity_bytes;
91 cls->_block_sz = used_bytes;
92 }
93 _total_chunk_sz += capacity_bytes;
94 _total_block_sz += used_bytes;
95 }
96 }
97
98
99 // Handles the difference in pointer width on 32 and 64 bit platforms
100 #ifdef _LP64
101 #define SPACE "%8s"
102 #else
103 #define SPACE "%s"
104 #endif
105
106
107 bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats const& cls) {
108 Klass* class_loader_klass = (cls._class_loader == NULL ? NULL : cls._class_loader->klass());
109 Klass* parent_klass = (cls._parent == NULL ? NULL : cls._parent->klass());
110
111 _out->print(INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
112 p2i(class_loader_klass), p2i(parent_klass), p2i(cls._cld),
113 cls._classes_count,
114 cls._chunk_sz, cls._block_sz);
115 if (class_loader_klass != NULL) {
116 _out->print("%s", class_loader_klass->external_name());
117 } else {
118 _out->print("<boot class loader>");
119 }
120 _out->cr();
121 if (cls._hidden_classes_count > 0) {
122 _out->print_cr(SPACE SPACE SPACE " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " + hidden classes",
123 "", "", "",
124 cls._hidden_classes_count,
125 cls._hidden_chunk_sz, cls._hidden_block_sz);
126 }
127 return true;
128 }
129
130
131 void ClassLoaderStatsClosure::print() {
132 _out->print_cr("ClassLoader" SPACE " Parent" SPACE " CLD*" SPACE " Classes ChunkSz BlockSz Type", "", "", "");
133 _stats->iterate(this);
134 _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
135 _out->print(SPACE SPACE SPACE " ", "", "", "");
136 _out->print_cr(UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
137 _total_classes,
138 _total_chunk_sz,
139 _total_block_sz);
140 _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
141 _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
142 }
143
144
145 void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
146 while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {
147 // This classloader has not loaded any classes
148 bool added = false;
149 ClassLoaderStats* cls = _stats->put_if_absent(cl, &added);
150 if (added) {
151 cls->_class_loader = cl;
152 cls->_parent = java_lang_ClassLoader::parent(cl);
153 _total_loaders++;
154 }
155 assert(cls->_class_loader == cl, "Sanity");
156
157 cl = java_lang_ClassLoader::parent(cl);
158 }
159 }
160
161
162 void ClassLoaderStatsVMOperation::doit() {
163 ClassLoaderStatsClosure clsc (_out);
164 ClassLoaderDataGraph::loaded_cld_do(&clsc);
165 clsc.print();
166 }
167
168
169 void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
170 ClassLoaderStatsVMOperation op(output());
171 VMThread::execute(&op);
172 }