1 /*
2 * Copyright (c) 2011, 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 #include "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "gc/shared/collectedHeap.hpp"
29 #include "logging/log.hpp"
30 #include "logging/logStream.hpp"
31 #include "memory/filemap.hpp"
32 #include "memory/metaspace.hpp"
33 #include "memory/metaspace/chunkManager.hpp"
34 #include "memory/metaspace/metachunk.hpp"
35 #include "memory/metaspace/metaspaceCommon.hpp"
36 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
37 #include "memory/metaspace/spaceManager.hpp"
38 #include "memory/metaspace/virtualSpaceList.hpp"
39 #include "memory/metaspaceShared.hpp"
40 #include "memory/metaspaceTracer.hpp"
41 #include "memory/universe.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/orderAccess.hpp"
44 #include "services/memTracker.hpp"
45 #include "utilities/copy.hpp"
46 #include "utilities/debug.hpp"
47 #include "utilities/formatBuffer.hpp"
48 #include "utilities/globalDefinitions.hpp"
49
50
51 using namespace metaspace;
52
53 MetaWord* last_allocated = 0;
54
55 size_t Metaspace::_compressed_class_space_size;
56 const MetaspaceTracer* Metaspace::_tracer = NULL;
57
58 DEBUG_ONLY(bool Metaspace::_frozen = false;)
59
60 static const char* space_type_name(Metaspace::MetaspaceType t) {
61 const char* s = NULL;
62 switch (t) {
63 case Metaspace::StandardMetaspaceType: s = "Standard"; break;
64 case Metaspace::BootMetaspaceType: s = "Boot"; break;
65 case Metaspace::UnsafeAnonymousMetaspaceType: s = "UnsafeAnonymous"; break;
66 case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
67 default: ShouldNotReachHere();
68 }
69 return s;
70 }
71
72 volatile size_t MetaspaceGC::_capacity_until_GC = 0;
73 uint MetaspaceGC::_shrink_factor = 0;
74 bool MetaspaceGC::_should_concurrent_collect = false;
75
76 // BlockFreelist methods
77
78 // VirtualSpaceNode methods
79
80 // MetaspaceGC methods
81
82 // VM_CollectForMetadataAllocation is the vm operation used to GC.
83 // Within the VM operation after the GC the attempt to allocate the metadata
84 // should succeed. If the GC did not free enough space for the metaspace
85 // allocation, the HWM is increased so that another virtualspace will be
86 // allocated for the metadata. With perm gen the increase in the perm
87 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
88 // metaspace policy uses those as the small and large steps for the HWM.
89 //
90 // After the GC the compute_new_size() for MetaspaceGC is called to
91 // resize the capacity of the metaspaces. The current implementation
92 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
93 // to resize the Java heap by some GC's. New flags can be implemented
94 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
95 // free space is desirable in the metaspace capacity to decide how much
96 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
97 // free space is desirable in the metaspace capacity before decreasing
98 // the HWM.
99
100 // Calculate the amount to increase the high water mark (HWM).
101 // Increase by a minimum amount (MinMetaspaceExpansion) so that
102 // another expansion is not requested too soon. If that is not
103 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
104 // If that is still not enough, expand by the size of the allocation
105 // plus some.
106 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
107 size_t min_delta = MinMetaspaceExpansion;
108 size_t max_delta = MaxMetaspaceExpansion;
109 size_t delta = align_up(bytes, Metaspace::commit_alignment());
110
111 if (delta <= min_delta) {
112 delta = min_delta;
113 } else if (delta <= max_delta) {
114 // Don't want to hit the high water mark on the next
115 // allocation so make the delta greater than just enough
116 // for this allocation.
117 delta = max_delta;
118 } else {
119 // This allocation is large but the next ones are probably not
120 // so increase by the minimum.
121 delta = delta + min_delta;
122 }
123
124 assert_is_aligned(delta, Metaspace::commit_alignment());
125
126 return delta;
127 }
128
129 size_t MetaspaceGC::capacity_until_GC() {
130 size_t value = OrderAccess::load_acquire(&_capacity_until_GC);
131 assert(value >= MetaspaceSize, "Not initialized properly?");
132 return value;
133 }
134
135 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC, bool* can_retry) {
136 assert_is_aligned(v, Metaspace::commit_alignment());
137
138 size_t old_capacity_until_GC = _capacity_until_GC;
139 size_t new_value = old_capacity_until_GC + v;
140
141 if (new_value < old_capacity_until_GC) {
142 // The addition wrapped around, set new_value to aligned max value.
143 new_value = align_down(max_uintx, Metaspace::commit_alignment());
144 }
145
146 if (new_value > MaxMetaspaceSize) {
147 if (can_retry != NULL) {
148 *can_retry = false;
149 }
150 return false;
151 }
152
153 if (can_retry != NULL) {
154 *can_retry = true;
155 }
156 size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
157
158 if (old_capacity_until_GC != prev_value) {
159 return false;
160 }
161
162 if (new_cap_until_GC != NULL) {
163 *new_cap_until_GC = new_value;
164 }
165 if (old_cap_until_GC != NULL) {
166 *old_cap_until_GC = old_capacity_until_GC;
167 }
168 return true;
169 }
170
171 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
172 assert_is_aligned(v, Metaspace::commit_alignment());
173
174 return Atomic::sub(v, &_capacity_until_GC);
175 }
176
177 void MetaspaceGC::initialize() {
178 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
179 // we can't do a GC during initialization.
180 _capacity_until_GC = MaxMetaspaceSize;
181 }
182
183 void MetaspaceGC::post_initialize() {
184 // Reset the high-water mark once the VM initialization is done.
185 _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
186 }
187
188 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
189 // Check if the compressed class space is full.
190 if (is_class && Metaspace::using_class_space()) {
191 size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
192 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
193 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
194 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
195 return false;
196 }
197 }
198
199 // Check if the user has imposed a limit on the metaspace memory.
200 size_t committed_bytes = MetaspaceUtils::committed_bytes();
201 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
202 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
203 (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
204 return false;
205 }
206
207 return true;
208 }
209
210 size_t MetaspaceGC::allowed_expansion() {
211 size_t committed_bytes = MetaspaceUtils::committed_bytes();
212 size_t capacity_until_gc = capacity_until_GC();
213
214 assert(capacity_until_gc >= committed_bytes,
215 "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
216 capacity_until_gc, committed_bytes);
217
218 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
219 size_t left_until_GC = capacity_until_gc - committed_bytes;
220 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
221 log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
222 " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
223 left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
224
225 return left_to_commit / BytesPerWord;
226 }
227
228 void MetaspaceGC::compute_new_size() {
229 assert(_shrink_factor <= 100, "invalid shrink factor");
230 uint current_shrink_factor = _shrink_factor;
231 _shrink_factor = 0;
232
233 // Using committed_bytes() for used_after_gc is an overestimation, since the
234 // chunk free lists are included in committed_bytes() and the memory in an
235 // un-fragmented chunk free list is available for future allocations.
236 // However, if the chunk free lists becomes fragmented, then the memory may
237 // not be available for future allocations and the memory is therefore "in use".
238 // Including the chunk free lists in the definition of "in use" is therefore
239 // necessary. Not including the chunk free lists can cause capacity_until_GC to
240 // shrink below committed_bytes() and this has caused serious bugs in the past.
241 const size_t used_after_gc = MetaspaceUtils::committed_bytes();
242 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
243
244 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
245 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
246
247 const double min_tmp = used_after_gc / maximum_used_percentage;
248 size_t minimum_desired_capacity =
249 (size_t)MIN2(min_tmp, double(MaxMetaspaceSize));
250 // Don't shrink less than the initial generation size
251 minimum_desired_capacity = MAX2(minimum_desired_capacity,
252 MetaspaceSize);
253
254 log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
255 log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f",
256 minimum_free_percentage, maximum_used_percentage);
257 log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K);
258
259
260 size_t shrink_bytes = 0;
261 if (capacity_until_GC < minimum_desired_capacity) {
262 // If we have less capacity below the metaspace HWM, then
263 // increment the HWM.
264 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
265 expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
266 // Don't expand unless it's significant
267 if (expand_bytes >= MinMetaspaceExpansion) {
268 size_t new_capacity_until_GC = 0;
269 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
270 assert(succeeded, "Should always succesfully increment HWM when at safepoint");
271
272 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
273 new_capacity_until_GC,
274 MetaspaceGCThresholdUpdater::ComputeNewSize);
275 log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB",
276 minimum_desired_capacity / (double) K,
277 expand_bytes / (double) K,
278 MinMetaspaceExpansion / (double) K,
279 new_capacity_until_GC / (double) K);
280 }
281 return;
282 }
283
284 // No expansion, now see if we want to shrink
285 // We would never want to shrink more than this
286 assert(capacity_until_GC >= minimum_desired_capacity,
287 SIZE_FORMAT " >= " SIZE_FORMAT,
288 capacity_until_GC, minimum_desired_capacity);
289 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
290
291 // Should shrinking be considered?
292 if (MaxMetaspaceFreeRatio < 100) {
293 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
294 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
295 const double max_tmp = used_after_gc / minimum_used_percentage;
296 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize));
297 maximum_desired_capacity = MAX2(maximum_desired_capacity,
298 MetaspaceSize);
299 log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f",
300 maximum_free_percentage, minimum_used_percentage);
301 log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB",
302 minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
303
304 assert(minimum_desired_capacity <= maximum_desired_capacity,
305 "sanity check");
306
307 if (capacity_until_GC > maximum_desired_capacity) {
308 // Capacity too large, compute shrinking size
309 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
310 // We don't want shrink all the way back to initSize if people call
311 // System.gc(), because some programs do that between "phases" and then
312 // we'd just have to grow the heap up again for the next phase. So we
313 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
314 // on the third call, and 100% by the fourth call. But if we recompute
315 // size without shrinking, it goes back to 0%.
316 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
317
318 shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
319
320 assert(shrink_bytes <= max_shrink_bytes,
321 "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
322 shrink_bytes, max_shrink_bytes);
323 if (current_shrink_factor == 0) {
324 _shrink_factor = 10;
325 } else {
326 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
327 }
328 log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK",
329 MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
330 log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK",
331 shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
332 }
333 }
334
335 // Don't shrink unless it's significant
336 if (shrink_bytes >= MinMetaspaceExpansion &&
337 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
338 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
339 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
340 new_capacity_until_GC,
341 MetaspaceGCThresholdUpdater::ComputeNewSize);
342 }
343 }
344
345 // MetaspaceUtils
346 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
347 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
348 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
349
350 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
351 // output will be the accumulated values for all live metaspaces.
352 // Note: method does not do any locking.
353 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
354 out->reset();
355 ClassLoaderDataGraphMetaspaceIterator iter;
356 while (iter.repeat()) {
357 ClassLoaderMetaspace* msp = iter.get_next();
358 if (msp != NULL) {
359 msp->add_to_statistics(out);
360 }
361 }
362 }
363
364 size_t MetaspaceUtils::free_in_vs_bytes(Metaspace::MetadataType mdtype) {
365 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
366 return list == NULL ? 0 : list->free_bytes();
367 }
368
369 size_t MetaspaceUtils::free_in_vs_bytes() {
370 return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType);
371 }
372
373 static void inc_stat_nonatomically(size_t* pstat, size_t words) {
374 assert_lock_strong(MetaspaceExpand_lock);
375 (*pstat) += words;
376 }
377
378 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
379 assert_lock_strong(MetaspaceExpand_lock);
380 const size_t size_now = *pstat;
381 assert(size_now >= words, "About to decrement counter below zero "
382 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
383 size_now, words);
384 *pstat = size_now - words;
385 }
386
387 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
388 Atomic::add(words, pstat);
389 }
390
391 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
392 const size_t size_now = *pstat;
393 assert(size_now >= words, "About to decrement counter below zero "
394 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
395 size_now, words);
396 Atomic::sub(words, pstat);
397 }
398
399 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
400 dec_stat_nonatomically(&_capacity_words[mdtype], words);
401 }
402 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
403 inc_stat_nonatomically(&_capacity_words[mdtype], words);
404 }
405 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
406 dec_stat_atomically(&_used_words[mdtype], words);
407 }
408 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
409 inc_stat_atomically(&_used_words[mdtype], words);
410 }
411 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
412 dec_stat_nonatomically(&_overhead_words[mdtype], words);
413 }
414 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
415 inc_stat_nonatomically(&_overhead_words[mdtype], words);
416 }
417
418 size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
419 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
420 return list == NULL ? 0 : list->reserved_bytes();
421 }
422
423 size_t MetaspaceUtils::committed_bytes(Metaspace::MetadataType mdtype) {
424 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
425 return list == NULL ? 0 : list->committed_bytes();
426 }
427
428 size_t MetaspaceUtils::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
429
430 size_t MetaspaceUtils::free_chunks_total_words(Metaspace::MetadataType mdtype) {
431 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
432 if (chunk_manager == NULL) {
433 return 0;
434 }
435 chunk_manager->slow_verify();
436 return chunk_manager->free_chunks_total_words();
437 }
438
439 size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
440 return free_chunks_total_words(mdtype) * BytesPerWord;
441 }
442
443 size_t MetaspaceUtils::free_chunks_total_words() {
444 return free_chunks_total_words(Metaspace::ClassType) +
445 free_chunks_total_words(Metaspace::NonClassType);
446 }
447
448 size_t MetaspaceUtils::free_chunks_total_bytes() {
449 return free_chunks_total_words() * BytesPerWord;
450 }
451
452 bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) {
453 return Metaspace::get_chunk_manager(mdtype) != NULL;
454 }
455
456 MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
457 if (!has_chunk_free_list(mdtype)) {
458 return MetaspaceChunkFreeListSummary();
459 }
460
461 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
462 return cm->chunk_free_list_summary();
463 }
464
465 void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) {
466 log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)",
467 prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K);
468 }
469
470 void MetaspaceUtils::print_on(outputStream* out) {
471 Metaspace::MetadataType nct = Metaspace::NonClassType;
472
473 out->print_cr(" Metaspace "
474 "used " SIZE_FORMAT "K, "
475 "capacity " SIZE_FORMAT "K, "
476 "committed " SIZE_FORMAT "K, "
477 "reserved " SIZE_FORMAT "K",
478 used_bytes()/K,
479 capacity_bytes()/K,
480 committed_bytes()/K,
481 reserved_bytes()/K);
482
483 if (Metaspace::using_class_space()) {
484 Metaspace::MetadataType ct = Metaspace::ClassType;
485 out->print_cr(" class space "
486 "used " SIZE_FORMAT "K, "
487 "capacity " SIZE_FORMAT "K, "
488 "committed " SIZE_FORMAT "K, "
489 "reserved " SIZE_FORMAT "K",
490 used_bytes(ct)/K,
491 capacity_bytes(ct)/K,
492 committed_bytes(ct)/K,
493 reserved_bytes(ct)/K);
494 }
495 }
496
497
498 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
499 const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
500 const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
501 {
502 if (Metaspace::using_class_space()) {
503 out->print(" Non-class space: ");
504 }
505 print_scaled_words(out, reserved_nonclass_words, scale, 7);
506 out->print(" reserved, ");
507 print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
508 out->print_cr(" committed ");
509
510 if (Metaspace::using_class_space()) {
511 const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
512 const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
513 out->print(" Class space: ");
514 print_scaled_words(out, reserved_class_words, scale, 7);
515 out->print(" reserved, ");
516 print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
517 out->print_cr(" committed ");
518
519 const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
520 const size_t committed_words = committed_nonclass_words + committed_class_words;
521 out->print(" Both: ");
522 print_scaled_words(out, reserved_words, scale, 7);
523 out->print(" reserved, ");
524 print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
525 out->print_cr(" committed ");
526 }
527 }
528 }
529
530 // This will print out a basic metaspace usage report but
531 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
532 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
533
534 out->cr();
535 out->print_cr("Usage:");
536
537 if (Metaspace::using_class_space()) {
538 out->print(" Non-class: ");
539 }
540
541 // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
542 // MetaspaceUtils.
543 const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
544 const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
545 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
546 const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
547
548 print_scaled_words(out, cap_nc, scale, 5);
549 out->print(" capacity, ");
550 print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
551 out->print(" used, ");
552 print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
553 out->print(" free+waste, ");
554 print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
555 out->print(" overhead. ");
556 out->cr();
557
558 if (Metaspace::using_class_space()) {
559 const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
560 const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
561 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
562 const size_t free_and_waste_c = cap_c - overhead_c - used_c;
563 out->print(" Class: ");
564 print_scaled_words(out, cap_c, scale, 5);
565 out->print(" capacity, ");
566 print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
567 out->print(" used, ");
568 print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
569 out->print(" free+waste, ");
570 print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
571 out->print(" overhead. ");
572 out->cr();
573
574 out->print(" Both: ");
575 const size_t cap = cap_nc + cap_c;
576
577 print_scaled_words(out, cap, scale, 5);
578 out->print(" capacity, ");
579 print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
580 out->print(" used, ");
581 print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
582 out->print(" free+waste, ");
583 print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
584 out->print(" overhead. ");
585 out->cr();
586 }
587
588 out->cr();
589 out->print_cr("Virtual space:");
590
591 print_vs(out, scale);
592
593 out->cr();
594 out->print_cr("Chunk freelists:");
595
596 if (Metaspace::using_class_space()) {
597 out->print(" Non-Class: ");
598 }
599 print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
600 out->cr();
601 if (Metaspace::using_class_space()) {
602 out->print(" Class: ");
603 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale);
604 out->cr();
605 out->print(" Both: ");
606 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words() +
607 Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
608 out->cr();
609 }
610 out->cr();
611
612 }
613
614 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
615
616 const bool print_loaders = (flags & rf_show_loaders) > 0;
617 const bool print_classes = (flags & rf_show_classes) > 0;
618 const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
619 const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
620
621 // Some report options require walking the class loader data graph.
622 PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
623 if (print_loaders) {
624 out->cr();
625 out->print_cr("Usage per loader:");
626 out->cr();
627 }
628
629 ClassLoaderDataGraph::loaded_cld_do(&cl); // collect data and optionally print
630
631 // Print totals, broken up by space type.
632 if (print_by_spacetype) {
633 out->cr();
634 out->print_cr("Usage per space type:");
635 out->cr();
636 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
637 space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
638 {
639 uintx num = cl._num_loaders_by_spacetype[space_type];
640 out->print("%s (" UINTX_FORMAT " loader%s)%c",
641 space_type_name((Metaspace::MetaspaceType)space_type),
642 num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.'));
643 if (num > 0) {
644 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
645 }
646 out->cr();
647 }
648 }
649
650 // Print totals for in-use data:
651 out->cr();
652 out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c",
653 cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.'));
654
655 cl._stats_total.print_on(out, scale, print_by_chunktype);
656
657 // -- Print Virtual space.
658 out->cr();
659 out->print_cr("Virtual space:");
660
661 print_vs(out, scale);
662
663 // -- Print VirtualSpaceList details.
664 if ((flags & rf_show_vslist) > 0) {
665 out->cr();
666 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
667
668 if (Metaspace::using_class_space()) {
669 out->print_cr(" Non-Class:");
670 }
671 Metaspace::space_list()->print_on(out, scale);
672 if (Metaspace::using_class_space()) {
673 out->print_cr(" Class:");
674 Metaspace::class_space_list()->print_on(out, scale);
675 }
676 }
677 out->cr();
678
679 // -- Print VirtualSpaceList map.
680 if ((flags & rf_show_vsmap) > 0) {
681 out->cr();
682 out->print_cr("Virtual space map:");
683
684 if (Metaspace::using_class_space()) {
685 out->print_cr(" Non-Class:");
686 }
687 Metaspace::space_list()->print_map(out);
688 if (Metaspace::using_class_space()) {
689 out->print_cr(" Class:");
690 Metaspace::class_space_list()->print_map(out);
691 }
692 }
693 out->cr();
694
695 // -- Print Freelists (ChunkManager) details
696 out->cr();
697 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
698
699 ChunkManagerStatistics non_class_cm_stat;
700 Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
701
702 if (Metaspace::using_class_space()) {
703 out->print_cr(" Non-Class:");
704 }
705 non_class_cm_stat.print_on(out, scale);
706
707 if (Metaspace::using_class_space()) {
708 ChunkManagerStatistics class_cm_stat;
709 Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
710 out->print_cr(" Class:");
711 class_cm_stat.print_on(out, scale);
712 }
713
714 // As a convenience, print a summary of common waste.
715 out->cr();
716 out->print("Waste ");
717 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
718 const size_t committed_words = committed_bytes() / BytesPerWord;
719
720 out->print("(percentages refer to total committed size ");
721 print_scaled_words(out, committed_words, scale);
722 out->print_cr("):");
723
724 // Print space committed but not yet used by any class loader
725 const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
726 out->print(" Committed unused: ");
727 print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
728 out->cr();
729
730 // Print waste for in-use chunks.
731 UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
732 UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
733 UsedChunksStatistics ucs_all;
734 ucs_all.add(ucs_nonclass);
735 ucs_all.add(ucs_class);
736
737 out->print(" Waste in chunks in use: ");
738 print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
739 out->cr();
740 out->print(" Free in chunks in use: ");
741 print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
742 out->cr();
743 out->print(" Overhead in chunks in use: ");
744 print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
745 out->cr();
746
747 // Print waste in free chunks.
748 const size_t total_capacity_in_free_chunks =
749 Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
750 (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
751 out->print(" In free chunks: ");
752 print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
753 out->cr();
754
755 // Print waste in deallocated blocks.
756 const uintx free_blocks_num =
757 cl._stats_total.nonclass_sm_stats().free_blocks_num() +
758 cl._stats_total.class_sm_stats().free_blocks_num();
759 const size_t free_blocks_cap_words =
760 cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
761 cl._stats_total.class_sm_stats().free_blocks_cap_words();
762 out->print("Deallocated from chunks in use: ");
763 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
764 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
765 out->cr();
766
767 // Print total waste.
768 const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
769 + free_blocks_cap_words + unused_words_in_vs;
770 out->print(" -total-: ");
771 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
772 out->cr();
773
774 // Print internal statistics
775 #ifdef ASSERT
776 out->cr();
777 out->cr();
778 out->print_cr("Internal statistics:");
779 out->cr();
780 out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
781 out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
782 out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
783 out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
784 out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
785 out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
786 out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
787 out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
788 out->cr();
789 #endif
790
791 // Print some interesting settings
792 out->cr();
793 out->cr();
794 out->print("MaxMetaspaceSize: ");
795 print_human_readable_size(out, MaxMetaspaceSize, scale);
796 out->cr();
797 out->print("InitialBootClassLoaderMetaspaceSize: ");
798 print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
799 out->cr();
800
801 out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
802 out->cr();
803 if (Metaspace::using_class_space()) {
804 out->print("CompressedClassSpaceSize: ");
805 print_human_readable_size(out, CompressedClassSpaceSize, scale);
806 }
807
808 out->cr();
809 out->cr();
810
811 } // MetaspaceUtils::print_report()
812
813 // Prints an ASCII representation of the given space.
814 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
815 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
816 const bool for_class = mdtype == Metaspace::ClassType ? true : false;
817 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
818 if (vsl != NULL) {
819 if (for_class) {
820 if (!Metaspace::using_class_space()) {
821 out->print_cr("No Class Space.");
822 return;
823 }
824 out->print_raw("---- Metaspace Map (Class Space) ----");
825 } else {
826 out->print_raw("---- Metaspace Map (Non-Class Space) ----");
827 }
828 // Print legend:
829 out->cr();
830 out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
831 out->cr();
832 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
833 vsl->print_map(out);
834 out->cr();
835 }
836 }
837
838 void MetaspaceUtils::verify_free_chunks() {
839 Metaspace::chunk_manager_metadata()->verify();
840 if (Metaspace::using_class_space()) {
841 Metaspace::chunk_manager_class()->verify();
842 }
843 }
844
845 void MetaspaceUtils::verify_metrics() {
846 #ifdef ASSERT
847 // Please note: there are time windows where the internal counters are out of sync with
848 // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
849 // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
850 // not be counted when iterating the CLDG. So be careful when you call this method.
851 ClassLoaderMetaspaceStatistics total_stat;
852 collect_statistics(&total_stat);
853 UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
854 UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
855
856 bool mismatch = false;
857 for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
858 Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
859 UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
860 if (capacity_words(mdtype) != chunk_stat.cap() ||
861 used_words(mdtype) != chunk_stat.used() ||
862 overhead_words(mdtype) != chunk_stat.overhead()) {
863 mismatch = true;
864 tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
865 tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
866 capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
867 tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
868 chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
869 tty->flush();
870 }
871 }
872 assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
873 #endif
874 }
875
876 // Utils to check if a pointer or range is part of a committed metaspace region.
877 metaspace::VirtualSpaceNode* MetaspaceUtils::find_enclosing_virtual_space(const void* p) {
878 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
879 VirtualSpaceNode* vsn = Metaspace::space_list()->find_enclosing_space(p);
880 if (Metaspace::using_class_space() && vsn == NULL) {
881 vsn = Metaspace::class_space_list()->find_enclosing_space(p);
882 }
883 return vsn;
884 }
885
886 bool MetaspaceUtils::is_range_in_committed(const void* from, const void* to) {
887 #if INCLUDE_CDS
888 if (UseSharedSpaces) {
889 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
890 if (FileMapInfo::current_info()->is_in_shared_region(from, idx)) {
891 return FileMapInfo::current_info()->is_in_shared_region(to, idx);
892 }
893 }
894 }
895 #endif
896 VirtualSpaceNode* vsn = find_enclosing_virtual_space(from);
897 return (vsn != NULL) && vsn->contains(to);
898 }
899
900
901 // Metaspace methods
902
903 size_t Metaspace::_first_chunk_word_size = 0;
904 size_t Metaspace::_first_class_chunk_word_size = 0;
905
906 size_t Metaspace::_commit_alignment = 0;
907 size_t Metaspace::_reserve_alignment = 0;
908
909 VirtualSpaceList* Metaspace::_space_list = NULL;
910 VirtualSpaceList* Metaspace::_class_space_list = NULL;
911
912 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
913 ChunkManager* Metaspace::_chunk_manager_class = NULL;
914
915 #define VIRTUALSPACEMULTIPLIER 2
916
917 #ifdef _LP64
918 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
919
920 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
921 assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
922 // Figure out the narrow_klass_base and the narrow_klass_shift. The
923 // narrow_klass_base is the lower of the metaspace base and the cds base
924 // (if cds is enabled). The narrow_klass_shift depends on the distance
925 // between the lower base and higher address.
926 address lower_base;
927 address higher_address;
928 #if INCLUDE_CDS
929 if (UseSharedSpaces) {
930 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
931 (address)(metaspace_base + compressed_class_space_size()));
932 lower_base = MIN2(metaspace_base, cds_base);
933 } else
934 #endif
935 {
936 higher_address = metaspace_base + compressed_class_space_size();
937 lower_base = metaspace_base;
938
939 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
940 // If compressed class space fits in lower 32G, we don't need a base.
941 if (higher_address <= (address)klass_encoding_max) {
942 lower_base = 0; // Effectively lower base is zero.
943 }
944 }
945
946 Universe::set_narrow_klass_base(lower_base);
947
948 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
949 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
950 // how dump time narrow_klass_shift is set. Although, CDS can work
951 // with zero-shift mode also, to be consistent with AOT it uses
952 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
953 // can be used at same time as AOT code.
954 if (!UseSharedSpaces
955 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
956 Universe::set_narrow_klass_shift(0);
957 } else {
958 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
959 }
960 AOTLoader::set_narrow_klass_shift();
961 }
962
963 #if INCLUDE_CDS
964 // Return TRUE if the specified metaspace_base and cds_base are close enough
965 // to work with compressed klass pointers.
966 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
967 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
968 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
969 address lower_base = MIN2((address)metaspace_base, cds_base);
970 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
971 (address)(metaspace_base + compressed_class_space_size()));
972 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
973 }
974 #endif
975
976 // Try to allocate the metaspace at the requested addr.
977 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
978 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
979 assert(using_class_space(), "called improperly");
980 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
981 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
982 "Metaspace size is too big");
983 assert_is_aligned(requested_addr, _reserve_alignment);
984 assert_is_aligned(cds_base, _reserve_alignment);
985 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
986
987 // Don't use large pages for the class space.
988 bool large_pages = false;
989
990 #if !(defined(AARCH64) || defined(AIX))
991 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
992 _reserve_alignment,
993 large_pages,
994 requested_addr);
995 #else // AARCH64
996 ReservedSpace metaspace_rs;
997
998 // Our compressed klass pointers may fit nicely into the lower 32
999 // bits.
1000 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
1001 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1002 _reserve_alignment,
1003 large_pages,
1004 requested_addr);
1005 }
1006
1007 if (! metaspace_rs.is_reserved()) {
1008 // Aarch64: Try to align metaspace so that we can decode a compressed
1009 // klass with a single MOVK instruction. We can do this iff the
1010 // compressed class base is a multiple of 4G.
1011 // Aix: Search for a place where we can find memory. If we need to load
1012 // the base, 4G alignment is helpful, too.
1013 size_t increment = AARCH64_ONLY(4*)G;
1014 for (char *a = align_up(requested_addr, increment);
1015 a < (char*)(1024*G);
1016 a += increment) {
1017 if (a == (char *)(32*G)) {
1018 // Go faster from here on. Zero-based is no longer possible.
1019 increment = 4*G;
1020 }
1021
1022 #if INCLUDE_CDS
1023 if (UseSharedSpaces
1024 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
1025 // We failed to find an aligned base that will reach. Fall
1026 // back to using our requested addr.
1027 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1028 _reserve_alignment,
1029 large_pages,
1030 requested_addr);
1031 break;
1032 }
1033 #endif
1034
1035 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1036 _reserve_alignment,
1037 large_pages,
1038 a);
1039 if (metaspace_rs.is_reserved())
1040 break;
1041 }
1042 }
1043
1044 #endif // AARCH64
1045
1046 if (!metaspace_rs.is_reserved()) {
1047 #if INCLUDE_CDS
1048 if (UseSharedSpaces) {
1049 size_t increment = align_up(1*G, _reserve_alignment);
1050
1051 // Keep trying to allocate the metaspace, increasing the requested_addr
1052 // by 1GB each time, until we reach an address that will no longer allow
1053 // use of CDS with compressed klass pointers.
1054 char *addr = requested_addr;
1055 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1056 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1057 addr = addr + increment;
1058 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1059 _reserve_alignment, large_pages, addr);
1060 }
1061 }
1062 #endif
1063 // If no successful allocation then try to allocate the space anywhere. If
1064 // that fails then OOM doom. At this point we cannot try allocating the
1065 // metaspace as if UseCompressedClassPointers is off because too much
1066 // initialization has happened that depends on UseCompressedClassPointers.
1067 // So, UseCompressedClassPointers cannot be turned off at this point.
1068 if (!metaspace_rs.is_reserved()) {
1069 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1070 _reserve_alignment, large_pages);
1071 if (!metaspace_rs.is_reserved()) {
1072 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1073 compressed_class_space_size()));
1074 }
1075 }
1076 }
1077
1078 // If we got here then the metaspace got allocated.
1079 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1080
1081 #if INCLUDE_CDS
1082 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1083 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1084 FileMapInfo::stop_sharing_and_unmap(
1085 "Could not allocate metaspace at a compatible address");
1086 }
1087 #endif
1088 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1089 UseSharedSpaces ? (address)cds_base : 0);
1090
1091 initialize_class_space(metaspace_rs);
1092
1093 LogTarget(Trace, gc, metaspace) lt;
1094 if (lt.is_enabled()) {
1095 ResourceMark rm;
1096 LogStream ls(lt);
1097 print_compressed_class_space(&ls, requested_addr);
1098 }
1099 }
1100
1101 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1102 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1103 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1104 if (_class_space_list != NULL) {
1105 address base = (address)_class_space_list->current_virtual_space()->bottom();
1106 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1107 compressed_class_space_size(), p2i(base));
1108 if (requested_addr != 0) {
1109 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1110 }
1111 st->cr();
1112 }
1113 }
1114
1115 // For UseCompressedClassPointers the class space is reserved above the top of
1116 // the Java heap. The argument passed in is at the base of the compressed space.
1117 void Metaspace::initialize_class_space(ReservedSpace rs) {
1118 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1119 assert(rs.size() >= CompressedClassSpaceSize,
1120 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1121 assert(using_class_space(), "Must be using class space");
1122 _class_space_list = new VirtualSpaceList(rs);
1123 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1124
1125 if (!_class_space_list->initialization_succeeded()) {
1126 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1127 }
1128 }
1129
1130 #endif
1131
1132 void Metaspace::ergo_initialize() {
1133 if (DumpSharedSpaces) {
1134 // Using large pages when dumping the shared archive is currently not implemented.
1135 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1136 }
1137
1138 size_t page_size = os::vm_page_size();
1139 if (UseLargePages && UseLargePagesInMetaspace) {
1140 page_size = os::large_page_size();
1141 }
1142
1143 _commit_alignment = page_size;
1144 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1145
1146 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1147 // override if MaxMetaspaceSize was set on the command line or not.
1148 // This information is needed later to conform to the specification of the
1149 // java.lang.management.MemoryUsage API.
1150 //
1151 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1152 // globals.hpp to the aligned value, but this is not possible, since the
1153 // alignment depends on other flags being parsed.
1154 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1155
1156 if (MetaspaceSize > MaxMetaspaceSize) {
1157 MetaspaceSize = MaxMetaspaceSize;
1158 }
1159
1160 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1161
1162 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1163
1164 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1165 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1166
1167 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1168
1169 // Initial virtual space size will be calculated at global_initialize()
1170 size_t min_metaspace_sz =
1171 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1172 if (UseCompressedClassPointers) {
1173 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1174 if (min_metaspace_sz >= MaxMetaspaceSize) {
1175 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1176 } else {
1177 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1178 MaxMetaspaceSize - min_metaspace_sz);
1179 }
1180 }
1181 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1182 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1183 min_metaspace_sz);
1184 }
1185
1186 set_compressed_class_space_size(CompressedClassSpaceSize);
1187 }
1188
1189 void Metaspace::global_initialize() {
1190 MetaspaceGC::initialize();
1191
1192 #if INCLUDE_CDS
1193 if (DumpSharedSpaces) {
1194 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1195 } else if (UseSharedSpaces) {
1196 // If any of the archived space fails to map, UseSharedSpaces
1197 // is reset to false. Fall through to the
1198 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1199 // metaspace.
1200 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1201 }
1202
1203 if (!DumpSharedSpaces && !UseSharedSpaces)
1204 #endif // INCLUDE_CDS
1205 {
1206 #ifdef _LP64
1207 if (using_class_space()) {
1208 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1209 allocate_metaspace_compressed_klass_ptrs(base, 0);
1210 }
1211 #endif // _LP64
1212 }
1213
1214 // Initialize these before initializing the VirtualSpaceList
1215 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1216 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1217 // Make the first class chunk bigger than a medium chunk so it's not put
1218 // on the medium chunk list. The next chunk will be small and progress
1219 // from there. This size calculated by -version.
1220 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1221 (CompressedClassSpaceSize/BytesPerWord)*2);
1222 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1223 // Arbitrarily set the initial virtual space to a multiple
1224 // of the boot class loader size.
1225 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1226 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1227
1228 // Initialize the list of virtual spaces.
1229 _space_list = new VirtualSpaceList(word_size);
1230 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1231
1232 if (!_space_list->initialization_succeeded()) {
1233 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1234 }
1235
1236 _tracer = new MetaspaceTracer();
1237 }
1238
1239 void Metaspace::post_initialize() {
1240 MetaspaceGC::post_initialize();
1241 }
1242
1243 void Metaspace::verify_global_initialization() {
1244 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1245 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1246
1247 if (using_class_space()) {
1248 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1249 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1250 }
1251 }
1252
1253 size_t Metaspace::align_word_size_up(size_t word_size) {
1254 size_t byte_size = word_size * wordSize;
1255 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1256 }
1257
1258 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1259 MetaspaceObj::Type type, TRAPS) {
1260 assert(!_frozen, "sanity");
1261 assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
1262
1263 if (HAS_PENDING_EXCEPTION) {
1264 assert(false, "Should not allocate with exception pending");
1265 return NULL; // caller does a CHECK_NULL too
1266 }
1267
1268 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1269 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1270
1271 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1272
1273 // Try to allocate metadata.
1274 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1275
1276 if (result == NULL) {
1277 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1278
1279 // Allocation failed.
1280 if (is_init_completed()) {
1281 // Only start a GC if the bootstrapping has completed.
1282 // Try to clean out some heap memory and retry. This can prevent premature
1283 // expansion of the metaspace.
1284 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1285 }
1286 }
1287
1288 if (result == NULL) {
1289 if (DumpSharedSpaces) {
1290 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1291 // We should abort to avoid generating a potentially bad archive.
1292 vm_exit_during_cds_dumping(err_msg("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1293 MetaspaceObj::type_name(type), word_size * BytesPerWord),
1294 err_msg("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize));
1295 }
1296 report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
1297 assert(HAS_PENDING_EXCEPTION, "sanity");
1298 return NULL;
1299 }
1300
1301 // Zero initialize.
1302 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1303
1304 return result;
1305 }
1306
1307 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1308 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1309
1310 // If result is still null, we are out of memory.
1311 Log(gc, metaspace, freelist, oom) log;
1312 if (log.is_info()) {
1313 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1314 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1315 ResourceMark rm;
1316 if (log.is_debug()) {
1317 if (loader_data->metaspace_or_null() != NULL) {
1318 LogStream ls(log.debug());
1319 loader_data->print_value_on(&ls);
1320 }
1321 }
1322 LogStream ls(log.info());
1323 // In case of an OOM, log out a short but still useful report.
1324 MetaspaceUtils::print_basic_report(&ls, 0);
1325 }
1326
1327 bool out_of_compressed_class_space = false;
1328 if (is_class_space_allocation(mdtype)) {
1329 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1330 out_of_compressed_class_space =
1331 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1332 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1333 CompressedClassSpaceSize;
1334 }
1335
1336 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1337 const char* space_string = out_of_compressed_class_space ?
1338 "Compressed class space" : "Metaspace";
1339
1340 report_java_out_of_memory(space_string);
1341
1342 if (JvmtiExport::should_post_resource_exhausted()) {
1343 JvmtiExport::post_resource_exhausted(
1344 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1345 space_string);
1346 }
1347
1348 if (!is_init_completed()) {
1349 vm_exit_during_initialization("OutOfMemoryError", space_string);
1350 }
1351
1352 if (out_of_compressed_class_space) {
1353 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1354 } else {
1355 THROW_OOP(Universe::out_of_memory_error_metaspace());
1356 }
1357 }
1358
1359 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1360 switch (mdtype) {
1361 case Metaspace::ClassType: return "Class";
1362 case Metaspace::NonClassType: return "Metadata";
1363 default:
1364 assert(false, "Got bad mdtype: %d", (int) mdtype);
1365 return NULL;
1366 }
1367 }
1368
1369 void Metaspace::purge(MetadataType mdtype) {
1370 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1371 }
1372
1373 void Metaspace::purge() {
1374 MutexLockerEx cl(MetaspaceExpand_lock,
1375 Mutex::_no_safepoint_check_flag);
1376 purge(NonClassType);
1377 if (using_class_space()) {
1378 purge(ClassType);
1379 }
1380 }
1381
1382 bool Metaspace::contains(const void* ptr) {
1383 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1384 return true;
1385 }
1386 return contains_non_shared(ptr);
1387 }
1388
1389 bool Metaspace::contains_non_shared(const void* ptr) {
1390 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1391 return true;
1392 }
1393
1394 return get_space_list(NonClassType)->contains(ptr);
1395 }
1396
1397 // ClassLoaderMetaspace
1398
1399 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1400 : _space_type(type)
1401 , _lock(lock)
1402 , _vsm(NULL)
1403 , _class_vsm(NULL)
1404 {
1405 initialize(lock, type);
1406 }
1407
1408 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1409 Metaspace::assert_not_frozen();
1410 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1411 delete _vsm;
1412 if (Metaspace::using_class_space()) {
1413 delete _class_vsm;
1414 }
1415 }
1416
1417 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1418 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1419 if (chunk != NULL) {
1420 // Add to this manager's list of chunks in use and make it the current_chunk().
1421 get_space_manager(mdtype)->add_chunk(chunk, true);
1422 }
1423 }
1424
1425 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1426 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1427
1428 // Get a chunk from the chunk freelist
1429 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1430
1431 if (chunk == NULL) {
1432 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1433 get_space_manager(mdtype)->medium_chunk_bunch());
1434 }
1435
1436 return chunk;
1437 }
1438
1439 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1440 Metaspace::verify_global_initialization();
1441
1442 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1443
1444 // Allocate SpaceManager for metadata objects.
1445 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1446
1447 if (Metaspace::using_class_space()) {
1448 // Allocate SpaceManager for classes.
1449 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1450 }
1451
1452 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1453
1454 // Allocate chunk for metadata objects
1455 initialize_first_chunk(type, Metaspace::NonClassType);
1456
1457 // Allocate chunk for class metadata objects
1458 if (Metaspace::using_class_space()) {
1459 initialize_first_chunk(type, Metaspace::ClassType);
1460 }
1461 }
1462
1463 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1464 Metaspace::assert_not_frozen();
1465
1466 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1467
1468 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1469 if (Metaspace::is_class_space_allocation(mdtype)) {
1470 return class_vsm()->allocate(word_size);
1471 } else {
1472 return vsm()->allocate(word_size);
1473 }
1474 }
1475
1476 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1477 Metaspace::assert_not_frozen();
1478 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1479 assert(delta_bytes > 0, "Must be");
1480
1481 size_t before = 0;
1482 size_t after = 0;
1483 bool can_retry = true;
1484 MetaWord* res;
1485 bool incremented;
1486
1487 // Each thread increments the HWM at most once. Even if the thread fails to increment
1488 // the HWM, an allocation is still attempted. This is because another thread must then
1489 // have incremented the HWM and therefore the allocation might still succeed.
1490 do {
1491 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before, &can_retry);
1492 res = allocate(word_size, mdtype);
1493 } while (!incremented && res == NULL && can_retry);
1494
1495 if (incremented) {
1496 Metaspace::tracer()->report_gc_threshold(before, after,
1497 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1498 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1499 }
1500
1501 return res;
1502 }
1503
1504 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1505 return (vsm()->used_words() +
1506 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1507 }
1508
1509 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1510 return (vsm()->capacity_words() +
1511 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1512 }
1513
1514 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1515 Metaspace::assert_not_frozen();
1516 assert(!SafepointSynchronize::is_at_safepoint()
1517 || Thread::current()->is_VM_thread(), "should be the VM thread");
1518
1519 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1520
1521 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1522
1523 if (is_class && Metaspace::using_class_space()) {
1524 class_vsm()->deallocate(ptr, word_size);
1525 } else {
1526 vsm()->deallocate(ptr, word_size);
1527 }
1528 }
1529
1530 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1531 assert(Metaspace::using_class_space(), "Has to use class space");
1532 return class_vsm()->calc_chunk_size(word_size);
1533 }
1534
1535 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1536 // Print both class virtual space counts and metaspace.
1537 if (Verbose) {
1538 vsm()->print_on(out);
1539 if (Metaspace::using_class_space()) {
1540 class_vsm()->print_on(out);
1541 }
1542 }
1543 }
1544
1545 void ClassLoaderMetaspace::verify() {
1546 vsm()->verify();
1547 if (Metaspace::using_class_space()) {
1548 class_vsm()->verify();
1549 }
1550 }
1551
1552 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1553 assert_lock_strong(lock());
1554 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1555 if (Metaspace::using_class_space()) {
1556 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1557 }
1558 }
1559
1560 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1561 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1562 add_to_statistics_locked(out);
1563 }
1564
1565 /////////////// Unit tests ///////////////
1566
1567 #ifndef PRODUCT
1568
1569 class TestMetaspaceUtilsTest : AllStatic {
1570 public:
1571 static void test_reserved() {
1572 size_t reserved = MetaspaceUtils::reserved_bytes();
1573
1574 assert(reserved > 0, "assert");
1575
1576 size_t committed = MetaspaceUtils::committed_bytes();
1577 assert(committed <= reserved, "assert");
1578
1579 size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType);
1580 assert(reserved_metadata > 0, "assert");
1581 assert(reserved_metadata <= reserved, "assert");
1582
1583 if (UseCompressedClassPointers) {
1584 size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType);
1585 assert(reserved_class > 0, "assert");
1586 assert(reserved_class < reserved, "assert");
1587 }
1588 }
1589
1590 static void test_committed() {
1591 size_t committed = MetaspaceUtils::committed_bytes();
1592
1593 assert(committed > 0, "assert");
1594
1595 size_t reserved = MetaspaceUtils::reserved_bytes();
1596 assert(committed <= reserved, "assert");
1597
1598 size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType);
1599 assert(committed_metadata > 0, "assert");
1600 assert(committed_metadata <= committed, "assert");
1601
1602 if (UseCompressedClassPointers) {
1603 size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
1604 assert(committed_class > 0, "assert");
1605 assert(committed_class < committed, "assert");
1606 }
1607 }
1608
1609 static void test_virtual_space_list_large_chunk() {
1610 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
1611 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1612 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
1613 // vm_allocation_granularity aligned on Windows.
1614 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
1615 large_size += (os::vm_page_size()/BytesPerWord);
1616 vs_list->get_new_chunk(large_size, 0);
1617 }
1618
1619 static void test() {
1620 test_reserved();
1621 test_committed();
1622 test_virtual_space_list_large_chunk();
1623 }
1624 };
1625
1626 void TestMetaspaceUtils_test() {
1627 TestMetaspaceUtilsTest::test();
1628 }
1629
1630 #endif // !PRODUCT
1631
1632 struct chunkmanager_statistics_t {
1633 int num_specialized_chunks;
1634 int num_small_chunks;
1635 int num_medium_chunks;
1636 int num_humongous_chunks;
1637 };
1638
1639 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1640 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1641 ChunkManagerStatistics stat;
1642 chunk_manager->collect_statistics(&stat);
1643 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1644 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1645 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1646 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1647 }
1648
1649 struct chunk_geometry_t {
1650 size_t specialized_chunk_word_size;
1651 size_t small_chunk_word_size;
1652 size_t medium_chunk_word_size;
1653 };
1654
1655 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1656 if (mdType == Metaspace::NonClassType) {
1657 out->specialized_chunk_word_size = SpecializedChunk;
1658 out->small_chunk_word_size = SmallChunk;
1659 out->medium_chunk_word_size = MediumChunk;
1660 } else {
1661 out->specialized_chunk_word_size = ClassSpecializedChunk;
1662 out->small_chunk_word_size = ClassSmallChunk;
1663 out->medium_chunk_word_size = ClassMediumChunk;
1664 }
1665 }