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) {
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 return false;
148 }
149
150 size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
151
152 if (old_capacity_until_GC != prev_value) {
153 return false;
154 }
155
156 if (new_cap_until_GC != NULL) {
157 *new_cap_until_GC = new_value;
158 }
159 if (old_cap_until_GC != NULL) {
160 *old_cap_until_GC = old_capacity_until_GC;
161 }
162 return true;
163 }
164
165 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
166 assert_is_aligned(v, Metaspace::commit_alignment());
167
168 return Atomic::sub(v, &_capacity_until_GC);
169 }
170
171 void MetaspaceGC::initialize() {
172 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
173 // we can't do a GC during initialization.
174 _capacity_until_GC = MaxMetaspaceSize;
175 }
176
177 void MetaspaceGC::post_initialize() {
178 // Reset the high-water mark once the VM initialization is done.
179 _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
180 }
181
182 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
183 // Check if the compressed class space is full.
184 if (is_class && Metaspace::using_class_space()) {
185 size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
186 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
187 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
188 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
189 return false;
190 }
191 }
192
193 // Check if the user has imposed a limit on the metaspace memory.
194 size_t committed_bytes = MetaspaceUtils::committed_bytes();
195 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
196 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
197 (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
198 return false;
199 }
200
201 return true;
202 }
203
204 size_t MetaspaceGC::allowed_expansion() {
205 size_t committed_bytes = MetaspaceUtils::committed_bytes();
206 size_t capacity_until_gc = capacity_until_GC();
207
208 assert(capacity_until_gc >= committed_bytes,
209 "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
210 capacity_until_gc, committed_bytes);
211
212 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
213 size_t left_until_GC = capacity_until_gc - committed_bytes;
214 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
215 log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
216 " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
217 left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
218
219 return left_to_commit / BytesPerWord;
220 }
221
222 void MetaspaceGC::compute_new_size() {
223 assert(_shrink_factor <= 100, "invalid shrink factor");
224 uint current_shrink_factor = _shrink_factor;
225 _shrink_factor = 0;
226
227 // Using committed_bytes() for used_after_gc is an overestimation, since the
228 // chunk free lists are included in committed_bytes() and the memory in an
229 // un-fragmented chunk free list is available for future allocations.
230 // However, if the chunk free lists becomes fragmented, then the memory may
231 // not be available for future allocations and the memory is therefore "in use".
232 // Including the chunk free lists in the definition of "in use" is therefore
233 // necessary. Not including the chunk free lists can cause capacity_until_GC to
234 // shrink below committed_bytes() and this has caused serious bugs in the past.
235 const size_t used_after_gc = MetaspaceUtils::committed_bytes();
236 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
237
238 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
239 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
240
241 const double min_tmp = used_after_gc / maximum_used_percentage;
242 size_t minimum_desired_capacity =
243 (size_t)MIN2(min_tmp, double(MaxMetaspaceSize));
244 // Don't shrink less than the initial generation size
245 minimum_desired_capacity = MAX2(minimum_desired_capacity,
246 MetaspaceSize);
247
248 log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
249 log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f",
250 minimum_free_percentage, maximum_used_percentage);
251 log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K);
252
253
254 size_t shrink_bytes = 0;
255 if (capacity_until_GC < minimum_desired_capacity) {
256 // If we have less capacity below the metaspace HWM, then
257 // increment the HWM.
258 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
259 expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
260 // Don't expand unless it's significant
261 if (expand_bytes >= MinMetaspaceExpansion) {
262 size_t new_capacity_until_GC = 0;
263 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
264 assert(succeeded, "Should always succesfully increment HWM when at safepoint");
265
266 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
267 new_capacity_until_GC,
268 MetaspaceGCThresholdUpdater::ComputeNewSize);
269 log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB",
270 minimum_desired_capacity / (double) K,
271 expand_bytes / (double) K,
272 MinMetaspaceExpansion / (double) K,
273 new_capacity_until_GC / (double) K);
274 }
275 return;
276 }
277
278 // No expansion, now see if we want to shrink
279 // We would never want to shrink more than this
280 assert(capacity_until_GC >= minimum_desired_capacity,
281 SIZE_FORMAT " >= " SIZE_FORMAT,
282 capacity_until_GC, minimum_desired_capacity);
283 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
284
285 // Should shrinking be considered?
286 if (MaxMetaspaceFreeRatio < 100) {
287 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
288 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
289 const double max_tmp = used_after_gc / minimum_used_percentage;
290 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize));
291 maximum_desired_capacity = MAX2(maximum_desired_capacity,
292 MetaspaceSize);
293 log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f",
294 maximum_free_percentage, minimum_used_percentage);
295 log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB",
296 minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
297
298 assert(minimum_desired_capacity <= maximum_desired_capacity,
299 "sanity check");
300
301 if (capacity_until_GC > maximum_desired_capacity) {
302 // Capacity too large, compute shrinking size
303 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
304 // We don't want shrink all the way back to initSize if people call
305 // System.gc(), because some programs do that between "phases" and then
306 // we'd just have to grow the heap up again for the next phase. So we
307 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
308 // on the third call, and 100% by the fourth call. But if we recompute
309 // size without shrinking, it goes back to 0%.
310 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
311
312 shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
313
314 assert(shrink_bytes <= max_shrink_bytes,
315 "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
316 shrink_bytes, max_shrink_bytes);
317 if (current_shrink_factor == 0) {
318 _shrink_factor = 10;
319 } else {
320 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
321 }
322 log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK",
323 MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
324 log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK",
325 shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
326 }
327 }
328
329 // Don't shrink unless it's significant
330 if (shrink_bytes >= MinMetaspaceExpansion &&
331 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
332 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
333 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
334 new_capacity_until_GC,
335 MetaspaceGCThresholdUpdater::ComputeNewSize);
336 }
337 }
338
339 // MetaspaceUtils
340 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
341 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
342 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
343
344 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
345 // output will be the accumulated values for all live metaspaces.
346 // Note: method does not do any locking.
347 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
348 out->reset();
349 ClassLoaderDataGraphMetaspaceIterator iter;
350 while (iter.repeat()) {
351 ClassLoaderMetaspace* msp = iter.get_next();
352 if (msp != NULL) {
353 msp->add_to_statistics(out);
354 }
355 }
356 }
357
358 size_t MetaspaceUtils::free_in_vs_bytes(Metaspace::MetadataType mdtype) {
359 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
360 return list == NULL ? 0 : list->free_bytes();
361 }
362
363 size_t MetaspaceUtils::free_in_vs_bytes() {
364 return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType);
365 }
366
367 static void inc_stat_nonatomically(size_t* pstat, size_t words) {
368 assert_lock_strong(MetaspaceExpand_lock);
369 (*pstat) += words;
370 }
371
372 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
373 assert_lock_strong(MetaspaceExpand_lock);
374 const size_t size_now = *pstat;
375 assert(size_now >= words, "About to decrement counter below zero "
376 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
377 size_now, words);
378 *pstat = size_now - words;
379 }
380
381 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
382 Atomic::add(words, pstat);
383 }
384
385 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
386 const size_t size_now = *pstat;
387 assert(size_now >= words, "About to decrement counter below zero "
388 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
389 size_now, words);
390 Atomic::sub(words, pstat);
391 }
392
393 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
394 dec_stat_nonatomically(&_capacity_words[mdtype], words);
395 }
396 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
397 inc_stat_nonatomically(&_capacity_words[mdtype], words);
398 }
399 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
400 dec_stat_atomically(&_used_words[mdtype], words);
401 }
402 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
403 inc_stat_atomically(&_used_words[mdtype], words);
404 }
405 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
406 dec_stat_nonatomically(&_overhead_words[mdtype], words);
407 }
408 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
409 inc_stat_nonatomically(&_overhead_words[mdtype], words);
410 }
411
412 size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
413 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
414 return list == NULL ? 0 : list->reserved_bytes();
415 }
416
417 size_t MetaspaceUtils::committed_bytes(Metaspace::MetadataType mdtype) {
418 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
419 return list == NULL ? 0 : list->committed_bytes();
420 }
421
422 size_t MetaspaceUtils::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
423
424 size_t MetaspaceUtils::free_chunks_total_words(Metaspace::MetadataType mdtype) {
425 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
426 if (chunk_manager == NULL) {
427 return 0;
428 }
429 chunk_manager->slow_verify();
430 return chunk_manager->free_chunks_total_words();
431 }
432
433 size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
434 return free_chunks_total_words(mdtype) * BytesPerWord;
435 }
436
437 size_t MetaspaceUtils::free_chunks_total_words() {
438 return free_chunks_total_words(Metaspace::ClassType) +
439 free_chunks_total_words(Metaspace::NonClassType);
440 }
441
442 size_t MetaspaceUtils::free_chunks_total_bytes() {
443 return free_chunks_total_words() * BytesPerWord;
444 }
445
446 bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) {
447 return Metaspace::get_chunk_manager(mdtype) != NULL;
448 }
449
450 MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
451 if (!has_chunk_free_list(mdtype)) {
452 return MetaspaceChunkFreeListSummary();
453 }
454
455 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
456 return cm->chunk_free_list_summary();
457 }
458
459 void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) {
460 log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)",
461 prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K);
462 }
463
464 void MetaspaceUtils::print_on(outputStream* out) {
465 Metaspace::MetadataType nct = Metaspace::NonClassType;
466
467 out->print_cr(" Metaspace "
468 "used " SIZE_FORMAT "K, "
469 "capacity " SIZE_FORMAT "K, "
470 "committed " SIZE_FORMAT "K, "
471 "reserved " SIZE_FORMAT "K",
472 used_bytes()/K,
473 capacity_bytes()/K,
474 committed_bytes()/K,
475 reserved_bytes()/K);
476
477 if (Metaspace::using_class_space()) {
478 Metaspace::MetadataType ct = Metaspace::ClassType;
479 out->print_cr(" class space "
480 "used " SIZE_FORMAT "K, "
481 "capacity " SIZE_FORMAT "K, "
482 "committed " SIZE_FORMAT "K, "
483 "reserved " SIZE_FORMAT "K",
484 used_bytes(ct)/K,
485 capacity_bytes(ct)/K,
486 committed_bytes(ct)/K,
487 reserved_bytes(ct)/K);
488 }
489 }
490
491
492 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
493 const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
494 const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
495 {
496 if (Metaspace::using_class_space()) {
497 out->print(" Non-class space: ");
498 }
499 print_scaled_words(out, reserved_nonclass_words, scale, 7);
500 out->print(" reserved, ");
501 print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
502 out->print_cr(" committed ");
503
504 if (Metaspace::using_class_space()) {
505 const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
506 const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
507 out->print(" Class space: ");
508 print_scaled_words(out, reserved_class_words, scale, 7);
509 out->print(" reserved, ");
510 print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
511 out->print_cr(" committed ");
512
513 const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
514 const size_t committed_words = committed_nonclass_words + committed_class_words;
515 out->print(" Both: ");
516 print_scaled_words(out, reserved_words, scale, 7);
517 out->print(" reserved, ");
518 print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
519 out->print_cr(" committed ");
520 }
521 }
522 }
523
524 // This will print out a basic metaspace usage report but
525 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
526 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
527
528 out->cr();
529 out->print_cr("Usage:");
530
531 if (Metaspace::using_class_space()) {
532 out->print(" Non-class: ");
533 }
534
535 // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
536 // MetaspaceUtils.
537 const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
538 const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
539 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
540 const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
541
542 print_scaled_words(out, cap_nc, scale, 5);
543 out->print(" capacity, ");
544 print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
545 out->print(" used, ");
546 print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
547 out->print(" free+waste, ");
548 print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
549 out->print(" overhead. ");
550 out->cr();
551
552 if (Metaspace::using_class_space()) {
553 const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
554 const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
555 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
556 const size_t free_and_waste_c = cap_c - overhead_c - used_c;
557 out->print(" Class: ");
558 print_scaled_words(out, cap_c, scale, 5);
559 out->print(" capacity, ");
560 print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
561 out->print(" used, ");
562 print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
563 out->print(" free+waste, ");
564 print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
565 out->print(" overhead. ");
566 out->cr();
567
568 out->print(" Both: ");
569 const size_t cap = cap_nc + cap_c;
570
571 print_scaled_words(out, cap, scale, 5);
572 out->print(" capacity, ");
573 print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
574 out->print(" used, ");
575 print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
576 out->print(" free+waste, ");
577 print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
578 out->print(" overhead. ");
579 out->cr();
580 }
581
582 out->cr();
583 out->print_cr("Virtual space:");
584
585 print_vs(out, scale);
586
587 out->cr();
588 out->print_cr("Chunk freelists:");
589
590 if (Metaspace::using_class_space()) {
591 out->print(" Non-Class: ");
592 }
593 print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
594 out->cr();
595 if (Metaspace::using_class_space()) {
596 out->print(" Class: ");
597 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale);
598 out->cr();
599 out->print(" Both: ");
600 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words() +
601 Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
602 out->cr();
603 }
604 out->cr();
605
606 }
607
608 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
609
610 const bool print_loaders = (flags & rf_show_loaders) > 0;
611 const bool print_classes = (flags & rf_show_classes) > 0;
612 const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
613 const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
614
615 // Some report options require walking the class loader data graph.
616 PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
617 if (print_loaders) {
618 out->cr();
619 out->print_cr("Usage per loader:");
620 out->cr();
621 }
622
623 ClassLoaderDataGraph::loaded_cld_do(&cl); // collect data and optionally print
624
625 // Print totals, broken up by space type.
626 if (print_by_spacetype) {
627 out->cr();
628 out->print_cr("Usage per space type:");
629 out->cr();
630 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
631 space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
632 {
633 uintx num = cl._num_loaders_by_spacetype[space_type];
634 out->print("%s (" UINTX_FORMAT " loader%s)%c",
635 space_type_name((Metaspace::MetaspaceType)space_type),
636 num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.'));
637 if (num > 0) {
638 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
639 }
640 out->cr();
641 }
642 }
643
644 // Print totals for in-use data:
645 out->cr();
646 out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c",
647 cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.'));
648
649 cl._stats_total.print_on(out, scale, print_by_chunktype);
650
651 // -- Print Virtual space.
652 out->cr();
653 out->print_cr("Virtual space:");
654
655 print_vs(out, scale);
656
657 // -- Print VirtualSpaceList details.
658 if ((flags & rf_show_vslist) > 0) {
659 out->cr();
660 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
661
662 if (Metaspace::using_class_space()) {
663 out->print_cr(" Non-Class:");
664 }
665 Metaspace::space_list()->print_on(out, scale);
666 if (Metaspace::using_class_space()) {
667 out->print_cr(" Class:");
668 Metaspace::class_space_list()->print_on(out, scale);
669 }
670 }
671 out->cr();
672
673 // -- Print VirtualSpaceList map.
674 if ((flags & rf_show_vsmap) > 0) {
675 out->cr();
676 out->print_cr("Virtual space map:");
677
678 if (Metaspace::using_class_space()) {
679 out->print_cr(" Non-Class:");
680 }
681 Metaspace::space_list()->print_map(out);
682 if (Metaspace::using_class_space()) {
683 out->print_cr(" Class:");
684 Metaspace::class_space_list()->print_map(out);
685 }
686 }
687 out->cr();
688
689 // -- Print Freelists (ChunkManager) details
690 out->cr();
691 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
692
693 ChunkManagerStatistics non_class_cm_stat;
694 Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
695
696 if (Metaspace::using_class_space()) {
697 out->print_cr(" Non-Class:");
698 }
699 non_class_cm_stat.print_on(out, scale);
700
701 if (Metaspace::using_class_space()) {
702 ChunkManagerStatistics class_cm_stat;
703 Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
704 out->print_cr(" Class:");
705 class_cm_stat.print_on(out, scale);
706 }
707
708 // As a convenience, print a summary of common waste.
709 out->cr();
710 out->print("Waste ");
711 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
712 const size_t committed_words = committed_bytes() / BytesPerWord;
713
714 out->print("(percentages refer to total committed size ");
715 print_scaled_words(out, committed_words, scale);
716 out->print_cr("):");
717
718 // Print space committed but not yet used by any class loader
719 const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
720 out->print(" Committed unused: ");
721 print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
722 out->cr();
723
724 // Print waste for in-use chunks.
725 UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
726 UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
727 UsedChunksStatistics ucs_all;
728 ucs_all.add(ucs_nonclass);
729 ucs_all.add(ucs_class);
730
731 out->print(" Waste in chunks in use: ");
732 print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
733 out->cr();
734 out->print(" Free in chunks in use: ");
735 print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
736 out->cr();
737 out->print(" Overhead in chunks in use: ");
738 print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
739 out->cr();
740
741 // Print waste in free chunks.
742 const size_t total_capacity_in_free_chunks =
743 Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
744 (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
745 out->print(" In free chunks: ");
746 print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
747 out->cr();
748
749 // Print waste in deallocated blocks.
750 const uintx free_blocks_num =
751 cl._stats_total.nonclass_sm_stats().free_blocks_num() +
752 cl._stats_total.class_sm_stats().free_blocks_num();
753 const size_t free_blocks_cap_words =
754 cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
755 cl._stats_total.class_sm_stats().free_blocks_cap_words();
756 out->print("Deallocated from chunks in use: ");
757 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
758 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
759 out->cr();
760
761 // Print total waste.
762 const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
763 + free_blocks_cap_words + unused_words_in_vs;
764 out->print(" -total-: ");
765 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
766 out->cr();
767
768 // Print internal statistics
769 #ifdef ASSERT
770 out->cr();
771 out->cr();
772 out->print_cr("Internal statistics:");
773 out->cr();
774 out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
775 out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
776 out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
777 out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
778 out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
779 out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
780 out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
781 out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
782 out->cr();
783 #endif
784
785 // Print some interesting settings
786 out->cr();
787 out->cr();
788 out->print("MaxMetaspaceSize: ");
789 print_human_readable_size(out, MaxMetaspaceSize, scale);
790 out->cr();
791 out->print("InitialBootClassLoaderMetaspaceSize: ");
792 print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
793 out->cr();
794
795 out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
796 out->cr();
797 if (Metaspace::using_class_space()) {
798 out->print("CompressedClassSpaceSize: ");
799 print_human_readable_size(out, CompressedClassSpaceSize, scale);
800 }
801
802 out->cr();
803 out->cr();
804
805 } // MetaspaceUtils::print_report()
806
807 // Prints an ASCII representation of the given space.
808 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
809 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
810 const bool for_class = mdtype == Metaspace::ClassType ? true : false;
811 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
812 if (vsl != NULL) {
813 if (for_class) {
814 if (!Metaspace::using_class_space()) {
815 out->print_cr("No Class Space.");
816 return;
817 }
818 out->print_raw("---- Metaspace Map (Class Space) ----");
819 } else {
820 out->print_raw("---- Metaspace Map (Non-Class Space) ----");
821 }
822 // Print legend:
823 out->cr();
824 out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
825 out->cr();
826 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
827 vsl->print_map(out);
828 out->cr();
829 }
830 }
831
832 void MetaspaceUtils::verify_free_chunks() {
833 Metaspace::chunk_manager_metadata()->verify();
834 if (Metaspace::using_class_space()) {
835 Metaspace::chunk_manager_class()->verify();
836 }
837 }
838
839 void MetaspaceUtils::verify_metrics() {
840 #ifdef ASSERT
841 // Please note: there are time windows where the internal counters are out of sync with
842 // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
843 // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
844 // not be counted when iterating the CLDG. So be careful when you call this method.
845 ClassLoaderMetaspaceStatistics total_stat;
846 collect_statistics(&total_stat);
847 UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
848 UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
849
850 bool mismatch = false;
851 for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
852 Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
853 UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
854 if (capacity_words(mdtype) != chunk_stat.cap() ||
855 used_words(mdtype) != chunk_stat.used() ||
856 overhead_words(mdtype) != chunk_stat.overhead()) {
857 mismatch = true;
858 tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
859 tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
860 capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
861 tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
862 chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
863 tty->flush();
864 }
865 }
866 assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
867 #endif
868 }
869
870 // Utils to check if a pointer or range is part of a committed metaspace region.
871 metaspace::VirtualSpaceNode* MetaspaceUtils::find_enclosing_virtual_space(const void* p) {
872 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
873 VirtualSpaceNode* vsn = Metaspace::space_list()->find_enclosing_space(p);
874 if (Metaspace::using_class_space() && vsn == NULL) {
875 vsn = Metaspace::class_space_list()->find_enclosing_space(p);
876 }
877 return vsn;
878 }
879
880 bool MetaspaceUtils::is_in_committed(const void* p) {
881 #if INCLUDE_CDS
882 if (UseSharedSpaces) {
883 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
884 if (FileMapInfo::current_info()->is_in_shared_region(p, idx)) {
885 return true;
886 }
887 }
888 }
889 #endif
890 return find_enclosing_virtual_space(p) != NULL;
891 }
892
893 bool MetaspaceUtils::is_range_in_committed(const void* from, const void* to) {
894 #if INCLUDE_CDS
895 if (UseSharedSpaces) {
896 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
897 if (FileMapInfo::current_info()->is_in_shared_region(from, idx)) {
898 return FileMapInfo::current_info()->is_in_shared_region(to, idx);
899 }
900 }
901 }
902 #endif
903 VirtualSpaceNode* vsn = find_enclosing_virtual_space(from);
904 return (vsn != NULL) && vsn->contains(to);
905 }
906
907
908 // Metaspace methods
909
910 size_t Metaspace::_first_chunk_word_size = 0;
911 size_t Metaspace::_first_class_chunk_word_size = 0;
912
913 size_t Metaspace::_commit_alignment = 0;
914 size_t Metaspace::_reserve_alignment = 0;
915
916 VirtualSpaceList* Metaspace::_space_list = NULL;
917 VirtualSpaceList* Metaspace::_class_space_list = NULL;
918
919 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
920 ChunkManager* Metaspace::_chunk_manager_class = NULL;
921
922 #define VIRTUALSPACEMULTIPLIER 2
923
924 #ifdef _LP64
925 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
926
927 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
928 assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
929 // Figure out the narrow_klass_base and the narrow_klass_shift. The
930 // narrow_klass_base is the lower of the metaspace base and the cds base
931 // (if cds is enabled). The narrow_klass_shift depends on the distance
932 // between the lower base and higher address.
933 address lower_base;
934 address higher_address;
935 #if INCLUDE_CDS
936 if (UseSharedSpaces) {
937 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
938 (address)(metaspace_base + compressed_class_space_size()));
939 lower_base = MIN2(metaspace_base, cds_base);
940 } else
941 #endif
942 {
943 higher_address = metaspace_base + compressed_class_space_size();
944 lower_base = metaspace_base;
945
946 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
947 // If compressed class space fits in lower 32G, we don't need a base.
948 if (higher_address <= (address)klass_encoding_max) {
949 lower_base = 0; // Effectively lower base is zero.
950 }
951 }
952
953 Universe::set_narrow_klass_base(lower_base);
954
955 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
956 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
957 // how dump time narrow_klass_shift is set. Although, CDS can work
958 // with zero-shift mode also, to be consistent with AOT it uses
959 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
960 // can be used at same time as AOT code.
961 if (!UseSharedSpaces
962 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
963 Universe::set_narrow_klass_shift(0);
964 } else {
965 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
966 }
967 AOTLoader::set_narrow_klass_shift();
968 }
969
970 #if INCLUDE_CDS
971 // Return TRUE if the specified metaspace_base and cds_base are close enough
972 // to work with compressed klass pointers.
973 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
974 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
975 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
976 address lower_base = MIN2((address)metaspace_base, cds_base);
977 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
978 (address)(metaspace_base + compressed_class_space_size()));
979 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
980 }
981 #endif
982
983 // Try to allocate the metaspace at the requested addr.
984 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
985 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
986 assert(using_class_space(), "called improperly");
987 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
988 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
989 "Metaspace size is too big");
990 assert_is_aligned(requested_addr, _reserve_alignment);
991 assert_is_aligned(cds_base, _reserve_alignment);
992 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
993
994 // Don't use large pages for the class space.
995 bool large_pages = false;
996
997 #if !(defined(AARCH64) || defined(AIX))
998 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
999 _reserve_alignment,
1000 large_pages,
1001 requested_addr);
1002 #else // AARCH64
1003 ReservedSpace metaspace_rs;
1004
1005 // Our compressed klass pointers may fit nicely into the lower 32
1006 // bits.
1007 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
1008 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1009 _reserve_alignment,
1010 large_pages,
1011 requested_addr);
1012 }
1013
1014 if (! metaspace_rs.is_reserved()) {
1015 // Aarch64: Try to align metaspace so that we can decode a compressed
1016 // klass with a single MOVK instruction. We can do this iff the
1017 // compressed class base is a multiple of 4G.
1018 // Aix: Search for a place where we can find memory. If we need to load
1019 // the base, 4G alignment is helpful, too.
1020 size_t increment = AARCH64_ONLY(4*)G;
1021 for (char *a = align_up(requested_addr, increment);
1022 a < (char*)(1024*G);
1023 a += increment) {
1024 if (a == (char *)(32*G)) {
1025 // Go faster from here on. Zero-based is no longer possible.
1026 increment = 4*G;
1027 }
1028
1029 #if INCLUDE_CDS
1030 if (UseSharedSpaces
1031 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
1032 // We failed to find an aligned base that will reach. Fall
1033 // back to using our requested addr.
1034 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1035 _reserve_alignment,
1036 large_pages,
1037 requested_addr);
1038 break;
1039 }
1040 #endif
1041
1042 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1043 _reserve_alignment,
1044 large_pages,
1045 a);
1046 if (metaspace_rs.is_reserved())
1047 break;
1048 }
1049 }
1050
1051 #endif // AARCH64
1052
1053 if (!metaspace_rs.is_reserved()) {
1054 #if INCLUDE_CDS
1055 if (UseSharedSpaces) {
1056 size_t increment = align_up(1*G, _reserve_alignment);
1057
1058 // Keep trying to allocate the metaspace, increasing the requested_addr
1059 // by 1GB each time, until we reach an address that will no longer allow
1060 // use of CDS with compressed klass pointers.
1061 char *addr = requested_addr;
1062 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1063 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1064 addr = addr + increment;
1065 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1066 _reserve_alignment, large_pages, addr);
1067 }
1068 }
1069 #endif
1070 // If no successful allocation then try to allocate the space anywhere. If
1071 // that fails then OOM doom. At this point we cannot try allocating the
1072 // metaspace as if UseCompressedClassPointers is off because too much
1073 // initialization has happened that depends on UseCompressedClassPointers.
1074 // So, UseCompressedClassPointers cannot be turned off at this point.
1075 if (!metaspace_rs.is_reserved()) {
1076 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1077 _reserve_alignment, large_pages);
1078 if (!metaspace_rs.is_reserved()) {
1079 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1080 compressed_class_space_size()));
1081 }
1082 }
1083 }
1084
1085 // If we got here then the metaspace got allocated.
1086 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1087
1088 #if INCLUDE_CDS
1089 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1090 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1091 FileMapInfo::stop_sharing_and_unmap(
1092 "Could not allocate metaspace at a compatible address");
1093 }
1094 #endif
1095 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1096 UseSharedSpaces ? (address)cds_base : 0);
1097
1098 initialize_class_space(metaspace_rs);
1099
1100 LogTarget(Trace, gc, metaspace) lt;
1101 if (lt.is_enabled()) {
1102 ResourceMark rm;
1103 LogStream ls(lt);
1104 print_compressed_class_space(&ls, requested_addr);
1105 }
1106 }
1107
1108 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1109 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1110 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1111 if (_class_space_list != NULL) {
1112 address base = (address)_class_space_list->current_virtual_space()->bottom();
1113 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1114 compressed_class_space_size(), p2i(base));
1115 if (requested_addr != 0) {
1116 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1117 }
1118 st->cr();
1119 }
1120 }
1121
1122 // For UseCompressedClassPointers the class space is reserved above the top of
1123 // the Java heap. The argument passed in is at the base of the compressed space.
1124 void Metaspace::initialize_class_space(ReservedSpace rs) {
1125 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1126 assert(rs.size() >= CompressedClassSpaceSize,
1127 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1128 assert(using_class_space(), "Must be using class space");
1129 _class_space_list = new VirtualSpaceList(rs);
1130 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1131
1132 if (!_class_space_list->initialization_succeeded()) {
1133 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1134 }
1135 }
1136
1137 #endif
1138
1139 void Metaspace::ergo_initialize() {
1140 if (DumpSharedSpaces) {
1141 // Using large pages when dumping the shared archive is currently not implemented.
1142 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1143 }
1144
1145 size_t page_size = os::vm_page_size();
1146 if (UseLargePages && UseLargePagesInMetaspace) {
1147 page_size = os::large_page_size();
1148 }
1149
1150 _commit_alignment = page_size;
1151 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1152
1153 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1154 // override if MaxMetaspaceSize was set on the command line or not.
1155 // This information is needed later to conform to the specification of the
1156 // java.lang.management.MemoryUsage API.
1157 //
1158 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1159 // globals.hpp to the aligned value, but this is not possible, since the
1160 // alignment depends on other flags being parsed.
1161 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1162
1163 if (MetaspaceSize > MaxMetaspaceSize) {
1164 MetaspaceSize = MaxMetaspaceSize;
1165 }
1166
1167 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1168
1169 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1170
1171 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1172 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1173
1174 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1175
1176 // Initial virtual space size will be calculated at global_initialize()
1177 size_t min_metaspace_sz =
1178 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1179 if (UseCompressedClassPointers) {
1180 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1181 if (min_metaspace_sz >= MaxMetaspaceSize) {
1182 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1183 } else {
1184 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1185 MaxMetaspaceSize - min_metaspace_sz);
1186 }
1187 }
1188 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1189 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1190 min_metaspace_sz);
1191 }
1192
1193 set_compressed_class_space_size(CompressedClassSpaceSize);
1194 }
1195
1196 void Metaspace::global_initialize() {
1197 MetaspaceGC::initialize();
1198
1199 #if INCLUDE_CDS
1200 if (DumpSharedSpaces) {
1201 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1202 } else if (UseSharedSpaces) {
1203 // If any of the archived space fails to map, UseSharedSpaces
1204 // is reset to false. Fall through to the
1205 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1206 // metaspace.
1207 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1208 }
1209
1210 if (!DumpSharedSpaces && !UseSharedSpaces)
1211 #endif // INCLUDE_CDS
1212 {
1213 #ifdef _LP64
1214 if (using_class_space()) {
1215 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1216 allocate_metaspace_compressed_klass_ptrs(base, 0);
1217 }
1218 #endif // _LP64
1219 }
1220
1221 // Initialize these before initializing the VirtualSpaceList
1222 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1223 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1224 // Make the first class chunk bigger than a medium chunk so it's not put
1225 // on the medium chunk list. The next chunk will be small and progress
1226 // from there. This size calculated by -version.
1227 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1228 (CompressedClassSpaceSize/BytesPerWord)*2);
1229 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1230 // Arbitrarily set the initial virtual space to a multiple
1231 // of the boot class loader size.
1232 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1233 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1234
1235 // Initialize the list of virtual spaces.
1236 _space_list = new VirtualSpaceList(word_size);
1237 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1238
1239 if (!_space_list->initialization_succeeded()) {
1240 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1241 }
1242
1243 _tracer = new MetaspaceTracer();
1244 }
1245
1246 void Metaspace::post_initialize() {
1247 MetaspaceGC::post_initialize();
1248 }
1249
1250 void Metaspace::verify_global_initialization() {
1251 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1252 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1253
1254 if (using_class_space()) {
1255 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1256 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1257 }
1258 }
1259
1260 size_t Metaspace::align_word_size_up(size_t word_size) {
1261 size_t byte_size = word_size * wordSize;
1262 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1263 }
1264
1265 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1266 MetaspaceObj::Type type, TRAPS) {
1267 assert(!_frozen, "sanity");
1268 assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
1269
1270 if (HAS_PENDING_EXCEPTION) {
1271 assert(false, "Should not allocate with exception pending");
1272 return NULL; // caller does a CHECK_NULL too
1273 }
1274
1275 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1276 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1277
1278 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1279
1280 // Try to allocate metadata.
1281 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1282
1283 if (result == NULL) {
1284 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1285
1286 // Allocation failed.
1287 if (is_init_completed()) {
1288 // Only start a GC if the bootstrapping has completed.
1289 // Try to clean out some heap memory and retry. This can prevent premature
1290 // expansion of the metaspace.
1291 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1292 }
1293 }
1294
1295 if (result == NULL) {
1296 if (DumpSharedSpaces) {
1297 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1298 // We should abort to avoid generating a potentially bad archive.
1299 vm_exit_during_cds_dumping(err_msg("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1300 MetaspaceObj::type_name(type), word_size * BytesPerWord),
1301 err_msg("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize));
1302 }
1303 report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
1304 assert(HAS_PENDING_EXCEPTION, "sanity");
1305 return NULL;
1306 }
1307
1308 // Zero initialize.
1309 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1310
1311 return result;
1312 }
1313
1314 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1315 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1316
1317 // If result is still null, we are out of memory.
1318 Log(gc, metaspace, freelist, oom) log;
1319 if (log.is_info()) {
1320 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1321 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1322 ResourceMark rm;
1323 if (log.is_debug()) {
1324 if (loader_data->metaspace_or_null() != NULL) {
1325 LogStream ls(log.debug());
1326 loader_data->print_value_on(&ls);
1327 }
1328 }
1329 LogStream ls(log.info());
1330 // In case of an OOM, log out a short but still useful report.
1331 MetaspaceUtils::print_basic_report(&ls, 0);
1332 }
1333
1334 bool out_of_compressed_class_space = false;
1335 if (is_class_space_allocation(mdtype)) {
1336 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1337 out_of_compressed_class_space =
1338 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1339 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1340 CompressedClassSpaceSize;
1341 }
1342
1343 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1344 const char* space_string = out_of_compressed_class_space ?
1345 "Compressed class space" : "Metaspace";
1346
1347 report_java_out_of_memory(space_string);
1348
1349 if (JvmtiExport::should_post_resource_exhausted()) {
1350 JvmtiExport::post_resource_exhausted(
1351 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1352 space_string);
1353 }
1354
1355 if (!is_init_completed()) {
1356 vm_exit_during_initialization("OutOfMemoryError", space_string);
1357 }
1358
1359 if (out_of_compressed_class_space) {
1360 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1361 } else {
1362 THROW_OOP(Universe::out_of_memory_error_metaspace());
1363 }
1364 }
1365
1366 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1367 switch (mdtype) {
1368 case Metaspace::ClassType: return "Class";
1369 case Metaspace::NonClassType: return "Metadata";
1370 default:
1371 assert(false, "Got bad mdtype: %d", (int) mdtype);
1372 return NULL;
1373 }
1374 }
1375
1376 void Metaspace::purge(MetadataType mdtype) {
1377 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1378 }
1379
1380 void Metaspace::purge() {
1381 MutexLockerEx cl(MetaspaceExpand_lock,
1382 Mutex::_no_safepoint_check_flag);
1383 purge(NonClassType);
1384 if (using_class_space()) {
1385 purge(ClassType);
1386 }
1387 }
1388
1389 bool Metaspace::contains(const void* ptr) {
1390 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1391 return true;
1392 }
1393 return contains_non_shared(ptr);
1394 }
1395
1396 bool Metaspace::contains_non_shared(const void* ptr) {
1397 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1398 return true;
1399 }
1400
1401 return get_space_list(NonClassType)->contains(ptr);
1402 }
1403
1404 // ClassLoaderMetaspace
1405
1406 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1407 : _space_type(type)
1408 , _lock(lock)
1409 , _vsm(NULL)
1410 , _class_vsm(NULL)
1411 {
1412 initialize(lock, type);
1413 }
1414
1415 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1416 Metaspace::assert_not_frozen();
1417 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1418 delete _vsm;
1419 if (Metaspace::using_class_space()) {
1420 delete _class_vsm;
1421 }
1422 }
1423
1424 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1425 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1426 if (chunk != NULL) {
1427 // Add to this manager's list of chunks in use and make it the current_chunk().
1428 get_space_manager(mdtype)->add_chunk(chunk, true);
1429 }
1430 }
1431
1432 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1433 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1434
1435 // Get a chunk from the chunk freelist
1436 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1437
1438 if (chunk == NULL) {
1439 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1440 get_space_manager(mdtype)->medium_chunk_bunch());
1441 }
1442
1443 return chunk;
1444 }
1445
1446 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1447 Metaspace::verify_global_initialization();
1448
1449 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1450
1451 // Allocate SpaceManager for metadata objects.
1452 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1453
1454 if (Metaspace::using_class_space()) {
1455 // Allocate SpaceManager for classes.
1456 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1457 }
1458
1459 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1460
1461 // Allocate chunk for metadata objects
1462 initialize_first_chunk(type, Metaspace::NonClassType);
1463
1464 // Allocate chunk for class metadata objects
1465 if (Metaspace::using_class_space()) {
1466 initialize_first_chunk(type, Metaspace::ClassType);
1467 }
1468 }
1469
1470 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1471 Metaspace::assert_not_frozen();
1472
1473 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1474
1475 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1476 if (Metaspace::is_class_space_allocation(mdtype)) {
1477 return class_vsm()->allocate(word_size);
1478 } else {
1479 return vsm()->allocate(word_size);
1480 }
1481 }
1482
1483 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1484 Metaspace::assert_not_frozen();
1485 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1486 assert(delta_bytes > 0, "Must be");
1487
1488 size_t before = 0;
1489 size_t after = 0;
1490 MetaWord* res;
1491 bool incremented;
1492
1493 // Each thread increments the HWM at most once. Even if the thread fails to increment
1494 // the HWM, an allocation is still attempted. This is because another thread must then
1495 // have incremented the HWM and therefore the allocation might still succeed.
1496 do {
1497 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
1498 if (!incremented && SafepointSynchronize::is_at_safepoint()) {
1499 // Cannot expand metaspace more.
1500 return NULL;
1501 }
1502 res = allocate(word_size, mdtype);
1503 } while (!incremented && res == NULL);
1504
1505 if (incremented) {
1506 Metaspace::tracer()->report_gc_threshold(before, after,
1507 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1508 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1509 }
1510
1511 return res;
1512 }
1513
1514 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1515 return (vsm()->used_words() +
1516 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1517 }
1518
1519 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1520 return (vsm()->capacity_words() +
1521 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1522 }
1523
1524 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1525 Metaspace::assert_not_frozen();
1526 assert(!SafepointSynchronize::is_at_safepoint()
1527 || Thread::current()->is_VM_thread(), "should be the VM thread");
1528
1529 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1530
1531 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1532
1533 if (is_class && Metaspace::using_class_space()) {
1534 class_vsm()->deallocate(ptr, word_size);
1535 } else {
1536 vsm()->deallocate(ptr, word_size);
1537 }
1538 }
1539
1540 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1541 assert(Metaspace::using_class_space(), "Has to use class space");
1542 return class_vsm()->calc_chunk_size(word_size);
1543 }
1544
1545 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1546 // Print both class virtual space counts and metaspace.
1547 if (Verbose) {
1548 vsm()->print_on(out);
1549 if (Metaspace::using_class_space()) {
1550 class_vsm()->print_on(out);
1551 }
1552 }
1553 }
1554
1555 void ClassLoaderMetaspace::verify() {
1556 vsm()->verify();
1557 if (Metaspace::using_class_space()) {
1558 class_vsm()->verify();
1559 }
1560 }
1561
1562 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1563 assert_lock_strong(lock());
1564 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1565 if (Metaspace::using_class_space()) {
1566 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1567 }
1568 }
1569
1570 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1571 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1572 add_to_statistics_locked(out);
1573 }
1574
1575 /////////////// Unit tests ///////////////
1576
1577 #ifndef PRODUCT
1578
1579 class TestMetaspaceUtilsTest : AllStatic {
1580 public:
1581 static void test_reserved() {
1582 size_t reserved = MetaspaceUtils::reserved_bytes();
1583
1584 assert(reserved > 0, "assert");
1585
1586 size_t committed = MetaspaceUtils::committed_bytes();
1587 assert(committed <= reserved, "assert");
1588
1589 size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType);
1590 assert(reserved_metadata > 0, "assert");
1591 assert(reserved_metadata <= reserved, "assert");
1592
1593 if (UseCompressedClassPointers) {
1594 size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType);
1595 assert(reserved_class > 0, "assert");
1596 assert(reserved_class < reserved, "assert");
1597 }
1598 }
1599
1600 static void test_committed() {
1601 size_t committed = MetaspaceUtils::committed_bytes();
1602
1603 assert(committed > 0, "assert");
1604
1605 size_t reserved = MetaspaceUtils::reserved_bytes();
1606 assert(committed <= reserved, "assert");
1607
1608 size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType);
1609 assert(committed_metadata > 0, "assert");
1610 assert(committed_metadata <= committed, "assert");
1611
1612 if (UseCompressedClassPointers) {
1613 size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
1614 assert(committed_class > 0, "assert");
1615 assert(committed_class < committed, "assert");
1616 }
1617 }
1618
1619 static void test_virtual_space_list_large_chunk() {
1620 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
1621 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1622 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
1623 // vm_allocation_granularity aligned on Windows.
1624 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
1625 large_size += (os::vm_page_size()/BytesPerWord);
1626 vs_list->get_new_chunk(large_size, 0);
1627 }
1628
1629 static void test() {
1630 test_reserved();
1631 test_committed();
1632 test_virtual_space_list_large_chunk();
1633 }
1634 };
1635
1636 void TestMetaspaceUtils_test() {
1637 TestMetaspaceUtilsTest::test();
1638 }
1639
1640 #endif // !PRODUCT
1641
1642 struct chunkmanager_statistics_t {
1643 int num_specialized_chunks;
1644 int num_small_chunks;
1645 int num_medium_chunks;
1646 int num_humongous_chunks;
1647 };
1648
1649 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1650 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1651 ChunkManagerStatistics stat;
1652 chunk_manager->collect_statistics(&stat);
1653 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1654 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1655 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1656 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1657 }
1658
1659 struct chunk_geometry_t {
1660 size_t specialized_chunk_word_size;
1661 size_t small_chunk_word_size;
1662 size_t medium_chunk_word_size;
1663 };
1664
1665 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1666 if (mdType == Metaspace::NonClassType) {
1667 out->specialized_chunk_word_size = SpecializedChunk;
1668 out->small_chunk_word_size = SmallChunk;
1669 out->medium_chunk_word_size = MediumChunk;
1670 } else {
1671 out->specialized_chunk_word_size = ClassSpecializedChunk;
1672 out->small_chunk_word_size = ClassSmallChunk;
1673 out->medium_chunk_word_size = ClassMediumChunk;
1674 }
1675 }