1 /*
2 * Copyright (c) 2018, 2023, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2018, 2020 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoaderData.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "memory/metaspace.hpp"
31 #include "memory/metaspace/chunkHeaderPool.hpp"
32 #include "memory/metaspace/chunkManager.hpp"
33 #include "memory/metaspace/internalStats.hpp"
34 #include "memory/metaspace/metaspaceCommon.hpp"
35 #include "memory/metaspace/metaspaceReporter.hpp"
36 #include "memory/metaspace/metaspaceSettings.hpp"
37 #include "memory/metaspace/metaspaceStatistics.hpp"
38 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
39 #include "memory/metaspace/runningCounters.hpp"
40 #include "memory/metaspace/virtualSpaceList.hpp"
41 #include "memory/metaspaceUtils.hpp"
42 #include "oops/compressedKlass.hpp"
43 #include "runtime/os.hpp"
44
45 namespace metaspace {
46
47 static const char* describe_spacetype(Metaspace::MetaspaceType st) {
48 const char* s = nullptr;
49 switch (st) {
50 case Metaspace::StandardMetaspaceType: s = "Standard"; break;
51 case Metaspace::BootMetaspaceType: s = "Boot"; break;
52 case Metaspace::ClassMirrorHolderMetaspaceType: s = "ClassMirrorHolder"; break;
53 case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
54 default: ShouldNotReachHere();
55 }
56 return s;
57 }
58
59 static void print_vs(outputStream* out, size_t scale) {
60 const size_t reserved_nc = RunningCounters::reserved_words_nonclass();
61 const size_t committed_nc = RunningCounters::committed_words_nonclass();
62 const int num_nodes_nc = VirtualSpaceList::vslist_nonclass()->num_nodes();
63
64 if (Metaspace::using_class_space()) {
65 const size_t reserved_c = RunningCounters::reserved_words_class();
66 const size_t committed_c = RunningCounters::committed_words_class();
67 const int num_nodes_c = VirtualSpaceList::vslist_class()->num_nodes();
68
69 out->print(" Non-class space: ");
70 print_scaled_words(out, reserved_nc, scale, 7);
71 out->print(" reserved, ");
72 print_scaled_words_and_percentage(out, committed_nc, reserved_nc, scale, 7);
73 out->print(" committed, ");
74 out->print(" %d nodes.", num_nodes_nc);
75 out->cr();
76 out->print(" Class space: ");
77 print_scaled_words(out, reserved_c, scale, 7);
78 out->print(" reserved, ");
79 print_scaled_words_and_percentage(out, committed_c, reserved_c, scale, 7);
80 out->print(" committed, ");
81 out->print(" %d nodes.", num_nodes_c);
82 out->cr();
83 out->print(" Both: ");
84 print_scaled_words(out, reserved_c + reserved_nc, scale, 7);
85 out->print(" reserved, ");
86 print_scaled_words_and_percentage(out, committed_c + committed_nc, reserved_c + reserved_nc, scale, 7);
87 out->print(" committed. ");
88 out->cr();
89 } else {
90 print_scaled_words(out, reserved_nc, scale, 7);
91 out->print(" reserved, ");
92 print_scaled_words_and_percentage(out, committed_nc, reserved_nc, scale, 7);
93 out->print(" committed, ");
94 out->print(" %d nodes.", num_nodes_nc);
95 out->cr();
96 }
97 }
98
99 static void print_settings(outputStream* out, size_t scale) {
100 out->print("MaxMetaspaceSize: ");
101 if (MaxMetaspaceSize == max_uintx) {
102 out->print("unlimited");
103 } else {
104 print_human_readable_size(out, MaxMetaspaceSize, scale);
105 }
106 out->cr();
107 if (Metaspace::using_class_space()) {
108 out->print("CompressedClassSpaceSize: ");
109 print_human_readable_size(out, CompressedClassSpaceSize, scale);
110 } else {
111 out->print("No class space");
112 }
113 out->cr();
114 out->print("Initial GC threshold: ");
115 print_human_readable_size(out, MetaspaceSize, scale);
116 out->cr();
117 out->print("Current GC threshold: ");
118 print_human_readable_size(out, MetaspaceGC::capacity_until_GC(), scale);
119 out->cr();
120 out->print_cr("CDS: %s", (UseSharedSpaces ? "on" : (CDSConfig::is_dumping_static_archive() ? "dump" : "off")));
121 Settings::print_on(out);
122 #ifdef _LP64
123 CompressedKlassPointers::print_mode(out);
124 #endif
125 }
126
127 // This will print out a basic metaspace usage report but
128 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
129 void MetaspaceReporter::print_basic_report(outputStream* out, size_t scale) {
130 if (!Metaspace::initialized()) {
131 out->print_cr("Metaspace not yet initialized.");
132 return;
133 }
134 out->cr();
135 out->print_cr("Usage:");
136 if (Metaspace::using_class_space()) {
137 out->print(" Non-class: ");
138 }
139
140 // Note: since we want to purely rely on counters, without any locking or walking the CLDG,
141 // for Usage stats (statistics over in-use chunks) all we can print is the
142 // used words. We cannot print committed areas, or free/waste areas, of in-use chunks require
143 // walking.
144 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
145
146 print_scaled_words(out, used_nc, scale, 5);
147 out->print(" used.");
148 out->cr();
149 if (Metaspace::using_class_space()) {
150 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
151 out->print(" Class: ");
152 print_scaled_words(out, used_c, scale, 5);
153 out->print(" used.");
154 out->cr();
155 out->print(" Both: ");
156 const size_t used = used_nc + used_c;
157 print_scaled_words(out, used, scale, 5);
158 out->print(" used.");
159 out->cr();
160 }
161 out->cr();
162 out->print_cr("Virtual space:");
163 print_vs(out, scale);
164 out->cr();
165 out->print_cr("Chunk freelists:");
166 if (Metaspace::using_class_space()) {
167 out->print(" Non-Class: ");
168 }
169 print_scaled_words(out, ChunkManager::chunkmanager_nonclass()->total_word_size(), scale);
170 out->cr();
171 if (Metaspace::using_class_space()) {
172 out->print(" Class: ");
173 print_scaled_words(out, ChunkManager::chunkmanager_class()->total_word_size(), scale);
174 out->cr();
175 out->print(" Both: ");
176 print_scaled_words(out, ChunkManager::chunkmanager_nonclass()->total_word_size() +
177 ChunkManager::chunkmanager_class()->total_word_size(), scale);
178 out->cr();
179 }
180 out->cr();
181
182 // Print basic settings
183 print_settings(out, scale);
184 out->cr();
185 out->cr();
186 out->print_cr("Internal statistics:");
187 out->cr();
188 InternalStats::print_on(out);
189 out->cr();
190 }
191
192 void MetaspaceReporter::print_report(outputStream* out, size_t scale, int flags) {
193 if (!Metaspace::initialized()) {
194 out->print_cr("Metaspace not yet initialized.");
195 return;
196 }
197 const bool print_loaders = (flags & (int)Option::ShowLoaders) > 0;
198 const bool print_classes = (flags & (int)Option::ShowClasses) > 0;
199 const bool print_by_chunktype = (flags & (int)Option::BreakDownByChunkType) > 0;
200 const bool print_by_spacetype = (flags & (int)Option::BreakDownBySpaceType) > 0;
201
202 // Some report options require walking the class loader data graph.
203 metaspace::PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
204 if (print_loaders) {
205 out->cr();
206 out->print_cr("Usage per loader:");
207 out->cr();
208 }
209
210 ClassLoaderDataGraph::loaded_cld_do(&cl); // collect data and optionally print
211
212 // Print totals, broken up by space type.
213 if (print_by_spacetype) {
214 out->cr();
215 out->print_cr("Usage per space type:");
216 out->cr();
217 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
218 space_type < (int)Metaspace::MetaspaceTypeCount; space_type++)
219 {
220 uintx num_loaders = cl._num_loaders_by_spacetype[space_type];
221 uintx num_classes = cl._num_classes_by_spacetype[space_type];
222 out->print("%s - " UINTX_FORMAT " %s",
223 describe_spacetype((Metaspace::MetaspaceType)space_type),
224 num_loaders, loaders_plural(num_loaders));
225 if (num_classes > 0) {
226 out->print(", ");
227
228 print_number_of_classes(out, num_classes, cl._num_classes_shared_by_spacetype[space_type]);
229 out->print(":");
230 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
231 } else {
232 out->print(".");
233 out->cr();
234 }
235 out->cr();
236 }
237 }
238
239 // Print totals for in-use data:
240 out->cr();
241 {
242 uintx num_loaders = cl._num_loaders;
243 out->print("Total Usage - " UINTX_FORMAT " %s, ",
244 num_loaders, loaders_plural(num_loaders));
245 print_number_of_classes(out, cl._num_classes, cl._num_classes_shared);
246 out->print(":");
247 cl._stats_total.print_on(out, scale, print_by_chunktype);
248 out->cr();
249 }
250
251 /////////////////////////////////////////////////
252 // -- Print Virtual space.
253 out->cr();
254 out->print_cr("Virtual space:");
255
256 print_vs(out, scale);
257
258 // -- Print VirtualSpaceList details.
259 if ((flags & (int)Option::ShowVSList) > 0) {
260 out->cr();
261 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
262
263 if (Metaspace::using_class_space()) {
264 out->print_cr(" Non-Class:");
265 }
266 VirtualSpaceList::vslist_nonclass()->print_on(out);
267 out->cr();
268 if (Metaspace::using_class_space()) {
269 out->print_cr(" Class:");
270 VirtualSpaceList::vslist_class()->print_on(out);
271 out->cr();
272 }
273 }
274 out->cr();
275
276 //////////// Freelists (ChunkManager) section ///////////////////////////
277
278 out->cr();
279 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
280
281 ChunkManagerStats non_class_cm_stat;
282 ChunkManagerStats class_cm_stat;
283 ChunkManagerStats total_cm_stat;
284
285 ChunkManager::chunkmanager_nonclass()->add_to_statistics(&non_class_cm_stat);
286 if (Metaspace::using_class_space()) {
287 ChunkManager::chunkmanager_nonclass()->add_to_statistics(&non_class_cm_stat);
288 ChunkManager::chunkmanager_class()->add_to_statistics(&class_cm_stat);
289 total_cm_stat.add(non_class_cm_stat);
290 total_cm_stat.add(class_cm_stat);
291
292 out->print_cr(" Non-Class:");
293 non_class_cm_stat.print_on(out, scale);
294 out->cr();
295 out->print_cr(" Class:");
296 class_cm_stat.print_on(out, scale);
297 out->cr();
298 out->print_cr(" Both:");
299 total_cm_stat.print_on(out, scale);
300 out->cr();
301 } else {
302 ChunkManager::chunkmanager_nonclass()->add_to_statistics(&non_class_cm_stat);
303 non_class_cm_stat.print_on(out, scale);
304 out->cr();
305 }
306
307 // -- Print Chunkmanager details.
308 if ((flags & (int)Option::ShowChunkFreeList) > 0) {
309 out->cr();
310 out->print_cr("Chunk freelist details:");
311 if (Metaspace::using_class_space()) {
312 out->print_cr(" Non-Class:");
313 }
314 ChunkManager::chunkmanager_nonclass()->print_on(out);
315 out->cr();
316 if (Metaspace::using_class_space()) {
317 out->print_cr(" Class:");
318 ChunkManager::chunkmanager_class()->print_on(out);
319 out->cr();
320 }
321 }
322 out->cr();
323
324
325 //////////// Waste section ///////////////////////////
326 // As a convenience, print a summary of common waste.
327 out->cr();
328 out->print("Waste (unused committed space):");
329 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
330 const size_t committed_words = RunningCounters::committed_words();
331
332 out->print(" (percentages refer to total committed size ");
333 print_scaled_words(out, committed_words, scale);
334 out->print_cr("):");
335
336 // Print waste for in-use chunks.
337 InUseChunkStats ucs_nonclass = cl._stats_total._arena_stats_nonclass.totals();
338 InUseChunkStats ucs_class = cl._stats_total._arena_stats_class.totals();
339 const size_t waste_in_chunks_in_use = ucs_nonclass._waste_words + ucs_class._waste_words;
340 const size_t free_in_chunks_in_use = ucs_nonclass._free_words + ucs_class._free_words;
341
342 out->print(" Waste in chunks in use: ");
343 print_scaled_words_and_percentage(out, waste_in_chunks_in_use, committed_words, scale, 6);
344 out->cr();
345 out->print(" Free in chunks in use: ");
346 print_scaled_words_and_percentage(out, free_in_chunks_in_use, committed_words, scale, 6);
347 out->cr();
348
349 // Print waste in free chunks.
350 const size_t committed_in_free_chunks = total_cm_stat.total_committed_word_size();
351 out->print(" In free chunks: ");
352 print_scaled_words_and_percentage(out, committed_in_free_chunks, committed_words, scale, 6);
353 out->cr();
354
355 // Print waste in deallocated blocks.
356 const uintx free_blocks_num =
357 cl._stats_total._arena_stats_nonclass._free_blocks_num +
358 cl._stats_total._arena_stats_class._free_blocks_num;
359 const size_t free_blocks_cap_words =
360 cl._stats_total._arena_stats_nonclass._free_blocks_word_size +
361 cl._stats_total._arena_stats_class._free_blocks_word_size;
362 out->print("Deallocated from chunks in use: ");
363 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
364 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
365 out->cr();
366
367 // Print total waste.
368 const size_t total_waste =
369 waste_in_chunks_in_use +
370 free_in_chunks_in_use +
371 committed_in_free_chunks +
372 free_blocks_cap_words;
373 out->print(" -total-: ");
374 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
375 out->cr();
376
377 // Also print chunk header pool size.
378 out->cr();
379 out->print("chunk header pool: %u items, ", ChunkHeaderPool::pool()->used());
380 print_scaled_words(out, ChunkHeaderPool::pool()->memory_footprint_words(), scale);
381 out->print(".");
382 out->cr();
383
384 // Print internal statistics
385 out->cr();
386 out->print_cr("Internal statistics:");
387 out->cr();
388 InternalStats::print_on(out);
389 out->cr();
390
391 // Print some interesting settings
392 out->cr();
393 out->print_cr("Settings:");
394 print_settings(out, scale);
395
396 out->cr();
397 out->cr();
398
399 DEBUG_ONLY(MetaspaceUtils::verify();)
400 } // MetaspaceUtils::print_report()
401
402 } // namespace metaspace
403