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 // Try to increase the _capacity_until_GC limit counter by v bytes.
136 // Returns true if it succeeded. It may fail if either another thread
137 // concurrently increased the limit or the new limit would be larger
138 // than MaxMetaspaceSize.
139 // On success, optionally returns new and old metaspace capacity in
140 // new_cap_until_GC and old_cap_until_GC respectively.
141 // On error, optionally sets can_retry to indicate whether if there is
142 // actually enough space remaining to satisfy the request.
143 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC, bool* can_retry) {
144 assert_is_aligned(v, Metaspace::commit_alignment());
145
146 size_t old_capacity_until_GC = _capacity_until_GC;
147 size_t new_value = old_capacity_until_GC + v;
148
149 if (new_value < old_capacity_until_GC) {
150 // The addition wrapped around, set new_value to aligned max value.
151 new_value = align_down(max_uintx, Metaspace::commit_alignment());
152 }
153
154 if (new_value > MaxMetaspaceSize) {
155 if (can_retry != NULL) {
156 *can_retry = false;
157 }
158 return false;
159 }
160
161 if (can_retry != NULL) {
162 *can_retry = true;
163 }
164 size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
165
166 if (old_capacity_until_GC != prev_value) {
167 return false;
168 }
169
170 if (new_cap_until_GC != NULL) {
171 *new_cap_until_GC = new_value;
172 }
173 if (old_cap_until_GC != NULL) {
174 *old_cap_until_GC = old_capacity_until_GC;
175 }
176 return true;
177 }
178
179 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
180 assert_is_aligned(v, Metaspace::commit_alignment());
181
182 return Atomic::sub(v, &_capacity_until_GC);
183 }
184
185 void MetaspaceGC::initialize() {
186 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
187 // we can't do a GC during initialization.
188 _capacity_until_GC = MaxMetaspaceSize;
189 }
190
191 void MetaspaceGC::post_initialize() {
192 // Reset the high-water mark once the VM initialization is done.
193 _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
194 }
195
196 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
197 // Check if the compressed class space is full.
198 if (is_class && Metaspace::using_class_space()) {
199 size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
200 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
201 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
202 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
203 return false;
204 }
205 }
206
207 // Check if the user has imposed a limit on the metaspace memory.
208 size_t committed_bytes = MetaspaceUtils::committed_bytes();
209 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
210 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
211 (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
212 return false;
213 }
214
215 return true;
216 }
217
218 size_t MetaspaceGC::allowed_expansion() {
219 size_t committed_bytes = MetaspaceUtils::committed_bytes();
220 size_t capacity_until_gc = capacity_until_GC();
221
222 assert(capacity_until_gc >= committed_bytes,
223 "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
224 capacity_until_gc, committed_bytes);
225
226 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
227 size_t left_until_GC = capacity_until_gc - committed_bytes;
228 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
229 log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
230 " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
231 left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
232
233 return left_to_commit / BytesPerWord;
234 }
235
236 void MetaspaceGC::compute_new_size() {
237 assert(_shrink_factor <= 100, "invalid shrink factor");
238 uint current_shrink_factor = _shrink_factor;
239 _shrink_factor = 0;
240
241 // Using committed_bytes() for used_after_gc is an overestimation, since the
242 // chunk free lists are included in committed_bytes() and the memory in an
243 // un-fragmented chunk free list is available for future allocations.
244 // However, if the chunk free lists becomes fragmented, then the memory may
245 // not be available for future allocations and the memory is therefore "in use".
246 // Including the chunk free lists in the definition of "in use" is therefore
247 // necessary. Not including the chunk free lists can cause capacity_until_GC to
248 // shrink below committed_bytes() and this has caused serious bugs in the past.
249 const size_t used_after_gc = MetaspaceUtils::committed_bytes();
250 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
251
252 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
253 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
254
255 const double min_tmp = used_after_gc / maximum_used_percentage;
256 size_t minimum_desired_capacity =
257 (size_t)MIN2(min_tmp, double(MaxMetaspaceSize));
258 // Don't shrink less than the initial generation size
259 minimum_desired_capacity = MAX2(minimum_desired_capacity,
260 MetaspaceSize);
261
262 log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
263 log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f",
264 minimum_free_percentage, maximum_used_percentage);
265 log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K);
266
267
268 size_t shrink_bytes = 0;
269 if (capacity_until_GC < minimum_desired_capacity) {
270 // If we have less capacity below the metaspace HWM, then
271 // increment the HWM.
272 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
273 expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
274 // Don't expand unless it's significant
275 if (expand_bytes >= MinMetaspaceExpansion) {
276 size_t new_capacity_until_GC = 0;
277 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
278 assert(succeeded, "Should always succesfully increment HWM when at safepoint");
279
280 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
281 new_capacity_until_GC,
282 MetaspaceGCThresholdUpdater::ComputeNewSize);
283 log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB",
284 minimum_desired_capacity / (double) K,
285 expand_bytes / (double) K,
286 MinMetaspaceExpansion / (double) K,
287 new_capacity_until_GC / (double) K);
288 }
289 return;
290 }
291
292 // No expansion, now see if we want to shrink
293 // We would never want to shrink more than this
294 assert(capacity_until_GC >= minimum_desired_capacity,
295 SIZE_FORMAT " >= " SIZE_FORMAT,
296 capacity_until_GC, minimum_desired_capacity);
297 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
298
299 // Should shrinking be considered?
300 if (MaxMetaspaceFreeRatio < 100) {
301 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
302 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
303 const double max_tmp = used_after_gc / minimum_used_percentage;
304 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize));
305 maximum_desired_capacity = MAX2(maximum_desired_capacity,
306 MetaspaceSize);
307 log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f",
308 maximum_free_percentage, minimum_used_percentage);
309 log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB",
310 minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
311
312 assert(minimum_desired_capacity <= maximum_desired_capacity,
313 "sanity check");
314
315 if (capacity_until_GC > maximum_desired_capacity) {
316 // Capacity too large, compute shrinking size
317 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
318 // We don't want shrink all the way back to initSize if people call
319 // System.gc(), because some programs do that between "phases" and then
320 // we'd just have to grow the heap up again for the next phase. So we
321 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
322 // on the third call, and 100% by the fourth call. But if we recompute
323 // size without shrinking, it goes back to 0%.
324 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
325
326 shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
327
328 assert(shrink_bytes <= max_shrink_bytes,
329 "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
330 shrink_bytes, max_shrink_bytes);
331 if (current_shrink_factor == 0) {
332 _shrink_factor = 10;
333 } else {
334 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
335 }
336 log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK",
337 MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
338 log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK",
339 shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
340 }
341 }
342
343 // Don't shrink unless it's significant
344 if (shrink_bytes >= MinMetaspaceExpansion &&
345 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
346 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
347 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
348 new_capacity_until_GC,
349 MetaspaceGCThresholdUpdater::ComputeNewSize);
350 }
351 }
352
353 // MetaspaceUtils
354 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
355 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
356 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
357
358 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
359 // output will be the accumulated values for all live metaspaces.
360 // Note: method does not do any locking.
361 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
362 out->reset();
363 ClassLoaderDataGraphMetaspaceIterator iter;
364 while (iter.repeat()) {
365 ClassLoaderMetaspace* msp = iter.get_next();
366 if (msp != NULL) {
367 msp->add_to_statistics(out);
368 }
369 }
370 }
371
372 size_t MetaspaceUtils::free_in_vs_bytes(Metaspace::MetadataType mdtype) {
373 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
374 return list == NULL ? 0 : list->free_bytes();
375 }
376
377 size_t MetaspaceUtils::free_in_vs_bytes() {
378 return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType);
379 }
380
381 static void inc_stat_nonatomically(size_t* pstat, size_t words) {
382 assert_lock_strong(MetaspaceExpand_lock);
383 (*pstat) += words;
384 }
385
386 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
387 assert_lock_strong(MetaspaceExpand_lock);
388 const size_t size_now = *pstat;
389 assert(size_now >= words, "About to decrement counter below zero "
390 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
391 size_now, words);
392 *pstat = size_now - words;
393 }
394
395 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
396 Atomic::add(words, pstat);
397 }
398
399 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
400 const size_t size_now = *pstat;
401 assert(size_now >= words, "About to decrement counter below zero "
402 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
403 size_now, words);
404 Atomic::sub(words, pstat);
405 }
406
407 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
408 dec_stat_nonatomically(&_capacity_words[mdtype], words);
409 }
410 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
411 inc_stat_nonatomically(&_capacity_words[mdtype], words);
412 }
413 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
414 dec_stat_atomically(&_used_words[mdtype], words);
415 }
416 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
417 inc_stat_atomically(&_used_words[mdtype], words);
418 }
419 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
420 dec_stat_nonatomically(&_overhead_words[mdtype], words);
421 }
422 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
423 inc_stat_nonatomically(&_overhead_words[mdtype], words);
424 }
425
426 size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
427 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
428 return list == NULL ? 0 : list->reserved_bytes();
429 }
430
431 size_t MetaspaceUtils::committed_bytes(Metaspace::MetadataType mdtype) {
432 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
433 return list == NULL ? 0 : list->committed_bytes();
434 }
435
436 size_t MetaspaceUtils::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
437
438 size_t MetaspaceUtils::free_chunks_total_words(Metaspace::MetadataType mdtype) {
439 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
440 if (chunk_manager == NULL) {
441 return 0;
442 }
443 return chunk_manager->free_chunks_total_words();
444 }
445
446 size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
447 return free_chunks_total_words(mdtype) * BytesPerWord;
448 }
449
450 size_t MetaspaceUtils::free_chunks_total_words() {
451 return free_chunks_total_words(Metaspace::ClassType) +
452 free_chunks_total_words(Metaspace::NonClassType);
453 }
454
455 size_t MetaspaceUtils::free_chunks_total_bytes() {
456 return free_chunks_total_words() * BytesPerWord;
457 }
458
459 bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) {
460 return Metaspace::get_chunk_manager(mdtype) != NULL;
461 }
462
463 MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
464 if (!has_chunk_free_list(mdtype)) {
465 return MetaspaceChunkFreeListSummary();
466 }
467
468 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
469 return cm->chunk_free_list_summary();
470 }
471
472 void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) {
473 log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)",
474 prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K);
475 }
476
477 void MetaspaceUtils::print_on(outputStream* out) {
478 Metaspace::MetadataType nct = Metaspace::NonClassType;
479
480 out->print_cr(" Metaspace "
481 "used " SIZE_FORMAT "K, "
482 "capacity " SIZE_FORMAT "K, "
483 "committed " SIZE_FORMAT "K, "
484 "reserved " SIZE_FORMAT "K",
485 used_bytes()/K,
486 capacity_bytes()/K,
487 committed_bytes()/K,
488 reserved_bytes()/K);
489
490 if (Metaspace::using_class_space()) {
491 Metaspace::MetadataType ct = Metaspace::ClassType;
492 out->print_cr(" class space "
493 "used " SIZE_FORMAT "K, "
494 "capacity " SIZE_FORMAT "K, "
495 "committed " SIZE_FORMAT "K, "
496 "reserved " SIZE_FORMAT "K",
497 used_bytes(ct)/K,
498 capacity_bytes(ct)/K,
499 committed_bytes(ct)/K,
500 reserved_bytes(ct)/K);
501 }
502 }
503
504
505 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
506 const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
507 const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
508 {
509 if (Metaspace::using_class_space()) {
510 out->print(" Non-class space: ");
511 }
512 print_scaled_words(out, reserved_nonclass_words, scale, 7);
513 out->print(" reserved, ");
514 print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
515 out->print_cr(" committed ");
516
517 if (Metaspace::using_class_space()) {
518 const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
519 const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
520 out->print(" Class space: ");
521 print_scaled_words(out, reserved_class_words, scale, 7);
522 out->print(" reserved, ");
523 print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
524 out->print_cr(" committed ");
525
526 const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
527 const size_t committed_words = committed_nonclass_words + committed_class_words;
528 out->print(" Both: ");
529 print_scaled_words(out, reserved_words, scale, 7);
530 out->print(" reserved, ");
531 print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
532 out->print_cr(" committed ");
533 }
534 }
535 }
536
537 // This will print out a basic metaspace usage report but
538 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
539 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
540
541 out->cr();
542 out->print_cr("Usage:");
543
544 if (Metaspace::using_class_space()) {
545 out->print(" Non-class: ");
546 }
547
548 // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
549 // MetaspaceUtils.
550 const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
551 const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
552 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
553 const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
554
555 print_scaled_words(out, cap_nc, scale, 5);
556 out->print(" capacity, ");
557 print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
558 out->print(" used, ");
559 print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
560 out->print(" free+waste, ");
561 print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
562 out->print(" overhead. ");
563 out->cr();
564
565 if (Metaspace::using_class_space()) {
566 const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
567 const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
568 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
569 const size_t free_and_waste_c = cap_c - overhead_c - used_c;
570 out->print(" Class: ");
571 print_scaled_words(out, cap_c, scale, 5);
572 out->print(" capacity, ");
573 print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
574 out->print(" used, ");
575 print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
576 out->print(" free+waste, ");
577 print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
578 out->print(" overhead. ");
579 out->cr();
580
581 out->print(" Both: ");
582 const size_t cap = cap_nc + cap_c;
583
584 print_scaled_words(out, cap, scale, 5);
585 out->print(" capacity, ");
586 print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
587 out->print(" used, ");
588 print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
589 out->print(" free+waste, ");
590 print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
591 out->print(" overhead. ");
592 out->cr();
593 }
594
595 out->cr();
596 out->print_cr("Virtual space:");
597
598 print_vs(out, scale);
599
600 out->cr();
601 out->print_cr("Chunk freelists:");
602
603 if (Metaspace::using_class_space()) {
604 out->print(" Non-Class: ");
605 }
606 print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
607 out->cr();
608 if (Metaspace::using_class_space()) {
609 out->print(" Class: ");
610 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes(), scale);
611 out->cr();
612 out->print(" Both: ");
613 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes() +
614 Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
615 out->cr();
616 }
617 out->cr();
618
619 }
620
621 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
622
623 const bool print_loaders = (flags & rf_show_loaders) > 0;
624 const bool print_classes = (flags & rf_show_classes) > 0;
625 const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
626 const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
627
628 // Some report options require walking the class loader data graph.
629 PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
630 if (print_loaders) {
631 out->cr();
632 out->print_cr("Usage per loader:");
633 out->cr();
634 }
635
636 ClassLoaderDataGraph::loaded_cld_do(&cl); // collect data and optionally print
637
638 // Print totals, broken up by space type.
639 if (print_by_spacetype) {
640 out->cr();
641 out->print_cr("Usage per space type:");
642 out->cr();
643 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
644 space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
645 {
646 uintx num = cl._num_loaders_by_spacetype[space_type];
647 out->print("%s (" UINTX_FORMAT " loader%s)%c",
648 space_type_name((Metaspace::MetaspaceType)space_type),
649 num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.'));
650 if (num > 0) {
651 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
652 }
653 out->cr();
654 }
655 }
656
657 // Print totals for in-use data:
658 out->cr();
659 out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c",
660 cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.'));
661
662 cl._stats_total.print_on(out, scale, print_by_chunktype);
663
664 // -- Print Virtual space.
665 out->cr();
666 out->print_cr("Virtual space:");
667
668 print_vs(out, scale);
669
670 // -- Print VirtualSpaceList details.
671 if ((flags & rf_show_vslist) > 0) {
672 out->cr();
673 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
674
675 if (Metaspace::using_class_space()) {
676 out->print_cr(" Non-Class:");
677 }
678 Metaspace::space_list()->print_on(out, scale);
679 if (Metaspace::using_class_space()) {
680 out->print_cr(" Class:");
681 Metaspace::class_space_list()->print_on(out, scale);
682 }
683 }
684 out->cr();
685
686 // -- Print VirtualSpaceList map.
687 if ((flags & rf_show_vsmap) > 0) {
688 out->cr();
689 out->print_cr("Virtual space map:");
690
691 if (Metaspace::using_class_space()) {
692 out->print_cr(" Non-Class:");
693 }
694 Metaspace::space_list()->print_map(out);
695 if (Metaspace::using_class_space()) {
696 out->print_cr(" Class:");
697 Metaspace::class_space_list()->print_map(out);
698 }
699 }
700 out->cr();
701
702 // -- Print Freelists (ChunkManager) details
703 out->cr();
704 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
705
706 ChunkManagerStatistics non_class_cm_stat;
707 Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
708
709 if (Metaspace::using_class_space()) {
710 out->print_cr(" Non-Class:");
711 }
712 non_class_cm_stat.print_on(out, scale);
713
714 if (Metaspace::using_class_space()) {
715 ChunkManagerStatistics class_cm_stat;
716 Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
717 out->print_cr(" Class:");
718 class_cm_stat.print_on(out, scale);
719 }
720
721 // As a convenience, print a summary of common waste.
722 out->cr();
723 out->print("Waste ");
724 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
725 const size_t committed_words = committed_bytes() / BytesPerWord;
726
727 out->print("(percentages refer to total committed size ");
728 print_scaled_words(out, committed_words, scale);
729 out->print_cr("):");
730
731 // Print space committed but not yet used by any class loader
732 const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
733 out->print(" Committed unused: ");
734 print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
735 out->cr();
736
737 // Print waste for in-use chunks.
738 UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
739 UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
740 UsedChunksStatistics ucs_all;
741 ucs_all.add(ucs_nonclass);
742 ucs_all.add(ucs_class);
743
744 out->print(" Waste in chunks in use: ");
745 print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
746 out->cr();
747 out->print(" Free in chunks in use: ");
748 print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
749 out->cr();
750 out->print(" Overhead in chunks in use: ");
751 print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
752 out->cr();
753
754 // Print waste in free chunks.
755 const size_t total_capacity_in_free_chunks =
756 Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
757 (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
758 out->print(" In free chunks: ");
759 print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
760 out->cr();
761
762 // Print waste in deallocated blocks.
763 const uintx free_blocks_num =
764 cl._stats_total.nonclass_sm_stats().free_blocks_num() +
765 cl._stats_total.class_sm_stats().free_blocks_num();
766 const size_t free_blocks_cap_words =
767 cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
768 cl._stats_total.class_sm_stats().free_blocks_cap_words();
769 out->print("Deallocated from chunks in use: ");
770 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
771 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
772 out->cr();
773
774 // Print total waste.
775 const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
776 + free_blocks_cap_words + unused_words_in_vs;
777 out->print(" -total-: ");
778 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
779 out->cr();
780
781 // Print internal statistics
782 #ifdef ASSERT
783 out->cr();
784 out->cr();
785 out->print_cr("Internal statistics:");
786 out->cr();
787 out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
788 out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
789 out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
790 out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
791 out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
792 out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
793 out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
794 out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
795 out->print_cr("Number of chunks added to freelist: " UINTX_FORMAT ".",
796 g_internal_statistics.num_chunks_added_to_freelist);
797 out->print_cr("Number of chunks removed from freelist: " UINTX_FORMAT ".",
798 g_internal_statistics.num_chunks_removed_from_freelist);
799 out->print_cr("Number of chunk merges: " UINTX_FORMAT ", split-ups: " UINTX_FORMAT ".",
800 g_internal_statistics.num_chunk_merges, g_internal_statistics.num_chunk_splits);
801
802 out->cr();
803 #endif
804
805 // Print some interesting settings
806 out->cr();
807 out->cr();
808 out->print("MaxMetaspaceSize: ");
809 print_human_readable_size(out, MaxMetaspaceSize, scale);
810 out->cr();
811 out->print("InitialBootClassLoaderMetaspaceSize: ");
812 print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
813 out->cr();
814
815 out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
816 out->cr();
817 if (Metaspace::using_class_space()) {
818 out->print("CompressedClassSpaceSize: ");
819 print_human_readable_size(out, CompressedClassSpaceSize, scale);
820 }
821
822 out->cr();
823 out->cr();
824
825 } // MetaspaceUtils::print_report()
826
827 // Prints an ASCII representation of the given space.
828 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
829 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
830 const bool for_class = mdtype == Metaspace::ClassType ? true : false;
831 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
832 if (vsl != NULL) {
833 if (for_class) {
834 if (!Metaspace::using_class_space()) {
835 out->print_cr("No Class Space.");
836 return;
837 }
838 out->print_raw("---- Metaspace Map (Class Space) ----");
839 } else {
840 out->print_raw("---- Metaspace Map (Non-Class Space) ----");
841 }
842 // Print legend:
843 out->cr();
844 out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
845 out->cr();
846 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
847 vsl->print_map(out);
848 out->cr();
849 }
850 }
851
852 void MetaspaceUtils::verify_free_chunks() {
853 #ifdef ASSERT
854 Metaspace::chunk_manager_metadata()->verify(false);
855 if (Metaspace::using_class_space()) {
856 Metaspace::chunk_manager_class()->verify(false);
857 }
858 #endif
859 }
860
861 void MetaspaceUtils::verify_metrics() {
862 #ifdef ASSERT
863 // Please note: there are time windows where the internal counters are out of sync with
864 // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
865 // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
866 // not be counted when iterating the CLDG. So be careful when you call this method.
867 ClassLoaderMetaspaceStatistics total_stat;
868 collect_statistics(&total_stat);
869 UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
870 UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
871
872 bool mismatch = false;
873 for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
874 Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
875 UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
876 if (capacity_words(mdtype) != chunk_stat.cap() ||
877 used_words(mdtype) != chunk_stat.used() ||
878 overhead_words(mdtype) != chunk_stat.overhead()) {
879 mismatch = true;
880 tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
881 tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
882 capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
883 tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
884 chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
885 tty->flush();
886 }
887 }
888 assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
889 #endif
890 }
891
892 // Utils to check if a pointer or range is part of a committed metaspace region.
893 metaspace::VirtualSpaceNode* MetaspaceUtils::find_enclosing_virtual_space(const void* p) {
894 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
895 VirtualSpaceNode* vsn = Metaspace::space_list()->find_enclosing_space(p);
896 if (Metaspace::using_class_space() && vsn == NULL) {
897 vsn = Metaspace::class_space_list()->find_enclosing_space(p);
898 }
899 return vsn;
900 }
901
902 bool MetaspaceUtils::is_range_in_committed(const void* from, const void* to) {
903 #if INCLUDE_CDS
904 if (UseSharedSpaces) {
905 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
906 if (FileMapInfo::current_info()->is_in_shared_region(from, idx)) {
907 return FileMapInfo::current_info()->is_in_shared_region(to, idx);
908 }
909 }
910 }
911 #endif
912 VirtualSpaceNode* vsn = find_enclosing_virtual_space(from);
913 return (vsn != NULL) && vsn->contains(to);
914 }
915
916
917 // Metaspace methods
918
919 size_t Metaspace::_first_chunk_word_size = 0;
920 size_t Metaspace::_first_class_chunk_word_size = 0;
921
922 size_t Metaspace::_commit_alignment = 0;
923 size_t Metaspace::_reserve_alignment = 0;
924
925 VirtualSpaceList* Metaspace::_space_list = NULL;
926 VirtualSpaceList* Metaspace::_class_space_list = NULL;
927
928 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
929 ChunkManager* Metaspace::_chunk_manager_class = NULL;
930
931 #define VIRTUALSPACEMULTIPLIER 2
932
933 #ifdef _LP64
934 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
935
936 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
937 assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
938 // Figure out the narrow_klass_base and the narrow_klass_shift. The
939 // narrow_klass_base is the lower of the metaspace base and the cds base
940 // (if cds is enabled). The narrow_klass_shift depends on the distance
941 // between the lower base and higher address.
942 address lower_base;
943 address higher_address;
944 #if INCLUDE_CDS
945 if (UseSharedSpaces) {
946 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
947 (address)(metaspace_base + compressed_class_space_size()));
948 lower_base = MIN2(metaspace_base, cds_base);
949 } else
950 #endif
951 {
952 higher_address = metaspace_base + compressed_class_space_size();
953 lower_base = metaspace_base;
954
955 // Using oopDesc::_metadata high bits so LogKlassAlignmentInBytes shift is no longer possible
956 uint64_t klass_encoding_max = UnscaledClassSpaceMax;
957 // If compressed class space fits in lower 32G, we don't need a base.
958 if (higher_address <= (address)klass_encoding_max) {
959 lower_base = 0; // Effectively lower base is zero.
960 }
961 }
962
963 Universe::set_narrow_klass_base(lower_base);
964
965 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
966 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
967 // how dump time narrow_klass_shift is set. Although, CDS can work
968 // with zero-shift mode also, to be consistent with AOT it uses
969 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
970 // can be used at same time as AOT code.
971 if (!UseSharedSpaces
972 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
973 Universe::set_narrow_klass_shift(0);
974 } else {
975 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
976 }
977 AOTLoader::set_narrow_klass_shift();
978 }
979
980 #if INCLUDE_CDS
981 // Return TRUE if the specified metaspace_base and cds_base are close enough
982 // to work with compressed klass pointers.
983 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
984 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
985 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
986 address lower_base = MIN2((address)metaspace_base, cds_base);
987 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
988 (address)(metaspace_base + compressed_class_space_size()));
989 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
990 }
991 #endif
992
993 // Try to allocate the metaspace at the requested addr.
994 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
995 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
996 assert(using_class_space(), "called improperly");
997 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
998 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
999 "Metaspace size is too big");
1000 assert_is_aligned(requested_addr, _reserve_alignment);
1001 assert_is_aligned(cds_base, _reserve_alignment);
1002 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
1003
1004 // Don't use large pages for the class space.
1005 bool large_pages = false;
1006
1007 #if !(defined(AARCH64) || defined(AIX))
1008 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
1009 _reserve_alignment,
1010 large_pages,
1011 requested_addr);
1012 #else // AARCH64
1013 ReservedSpace metaspace_rs;
1014
1015 // Our compressed klass pointers may fit nicely into the lower 32
1016 // bits.
1017 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
1018 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1019 _reserve_alignment,
1020 large_pages,
1021 requested_addr);
1022 }
1023
1024 if (! metaspace_rs.is_reserved()) {
1025 // Aarch64: Try to align metaspace so that we can decode a compressed
1026 // klass with a single MOVK instruction. We can do this iff the
1027 // compressed class base is a multiple of 4G.
1028 // Aix: Search for a place where we can find memory. If we need to load
1029 // the base, 4G alignment is helpful, too.
1030 size_t increment = AARCH64_ONLY(4*)G;
1031 for (char *a = align_up(requested_addr, increment);
1032 a < (char*)(1024*G);
1033 a += increment) {
1034 if (a == (char *)(32*G)) {
1035 // Go faster from here on. Zero-based is no longer possible.
1036 increment = 4*G;
1037 }
1038
1039 #if INCLUDE_CDS
1040 if (UseSharedSpaces
1041 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
1042 // We failed to find an aligned base that will reach. Fall
1043 // back to using our requested addr.
1044 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1045 _reserve_alignment,
1046 large_pages,
1047 requested_addr);
1048 break;
1049 }
1050 #endif
1051
1052 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1053 _reserve_alignment,
1054 large_pages,
1055 a);
1056 if (metaspace_rs.is_reserved())
1057 break;
1058 }
1059 }
1060
1061 #endif // AARCH64
1062
1063 if (!metaspace_rs.is_reserved()) {
1064 #if INCLUDE_CDS
1065 if (UseSharedSpaces) {
1066 size_t increment = align_up(1*G, _reserve_alignment);
1067
1068 // Keep trying to allocate the metaspace, increasing the requested_addr
1069 // by 1GB each time, until we reach an address that will no longer allow
1070 // use of CDS with compressed klass pointers.
1071 char *addr = requested_addr;
1072 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1073 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1074 addr = addr + increment;
1075 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1076 _reserve_alignment, large_pages, addr);
1077 }
1078 }
1079 #endif
1080 // If no successful allocation then try to allocate the space anywhere. If
1081 // that fails then OOM doom. At this point we cannot try allocating the
1082 // metaspace as if UseCompressedClassPointers is off because too much
1083 // initialization has happened that depends on UseCompressedClassPointers.
1084 // So, UseCompressedClassPointers cannot be turned off at this point.
1085 if (!metaspace_rs.is_reserved()) {
1086 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1087 _reserve_alignment, large_pages);
1088 if (!metaspace_rs.is_reserved()) {
1089 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1090 compressed_class_space_size()));
1091 }
1092 }
1093 }
1094
1095 // If we got here then the metaspace got allocated.
1096 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1097
1098 #if INCLUDE_CDS
1099 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1100 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1101 FileMapInfo::stop_sharing_and_unmap(
1102 "Could not allocate metaspace at a compatible address");
1103 }
1104 #endif
1105 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1106 UseSharedSpaces ? (address)cds_base : 0);
1107
1108 initialize_class_space(metaspace_rs);
1109
1110 LogTarget(Trace, gc, metaspace) lt;
1111 if (lt.is_enabled()) {
1112 ResourceMark rm;
1113 LogStream ls(lt);
1114 print_compressed_class_space(&ls, requested_addr);
1115 }
1116 }
1117
1118 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1119 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1120 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1121 if (_class_space_list != NULL) {
1122 address base = (address)_class_space_list->current_virtual_space()->bottom();
1123 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1124 compressed_class_space_size(), p2i(base));
1125 if (requested_addr != 0) {
1126 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1127 }
1128 st->cr();
1129 }
1130 }
1131
1132 // For UseCompressedClassPointers the class space is reserved above the top of
1133 // the Java heap. The argument passed in is at the base of the compressed space.
1134 void Metaspace::initialize_class_space(ReservedSpace rs) {
1135 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1136 assert(rs.size() >= CompressedClassSpaceSize,
1137 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1138 assert(using_class_space(), "Must be using class space");
1139 _class_space_list = new VirtualSpaceList(rs);
1140 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1141
1142 if (!_class_space_list->initialization_succeeded()) {
1143 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1144 }
1145 }
1146
1147 #endif
1148
1149 void Metaspace::ergo_initialize() {
1150 if (DumpSharedSpaces) {
1151 // Using large pages when dumping the shared archive is currently not implemented.
1152 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1153 }
1154
1155 size_t page_size = os::vm_page_size();
1156 if (UseLargePages && UseLargePagesInMetaspace) {
1157 page_size = os::large_page_size();
1158 }
1159
1160 _commit_alignment = page_size;
1161 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1162
1163 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1164 // override if MaxMetaspaceSize was set on the command line or not.
1165 // This information is needed later to conform to the specification of the
1166 // java.lang.management.MemoryUsage API.
1167 //
1168 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1169 // globals.hpp to the aligned value, but this is not possible, since the
1170 // alignment depends on other flags being parsed.
1171 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1172
1173 if (MetaspaceSize > MaxMetaspaceSize) {
1174 MetaspaceSize = MaxMetaspaceSize;
1175 }
1176
1177 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1178
1179 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1180
1181 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1182 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1183
1184 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1185
1186 // Initial virtual space size will be calculated at global_initialize()
1187 size_t min_metaspace_sz =
1188 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1189 if (UseCompressedClassPointers) {
1190 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1191 if (min_metaspace_sz >= MaxMetaspaceSize) {
1192 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1193 } else {
1194 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1195 MaxMetaspaceSize - min_metaspace_sz);
1196 }
1197 }
1198 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1199 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1200 min_metaspace_sz);
1201 }
1202
1203 set_compressed_class_space_size(CompressedClassSpaceSize);
1204 }
1205
1206 void Metaspace::global_initialize() {
1207 MetaspaceGC::initialize();
1208
1209 #if INCLUDE_CDS
1210 if (DumpSharedSpaces) {
1211 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1212 } else if (UseSharedSpaces) {
1213 // If any of the archived space fails to map, UseSharedSpaces
1214 // is reset to false. Fall through to the
1215 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1216 // metaspace.
1217 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1218 }
1219
1220 if (!DumpSharedSpaces && !UseSharedSpaces)
1221 #endif // INCLUDE_CDS
1222 {
1223 #ifdef _LP64
1224 if (using_class_space()) {
1225 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1226 allocate_metaspace_compressed_klass_ptrs(base, 0);
1227 }
1228 #endif // _LP64
1229 }
1230
1231 // Initialize these before initializing the VirtualSpaceList
1232 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1233 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1234 // Make the first class chunk bigger than a medium chunk so it's not put
1235 // on the medium chunk list. The next chunk will be small and progress
1236 // from there. This size calculated by -version.
1237 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1238 (CompressedClassSpaceSize/BytesPerWord)*2);
1239 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1240 // Arbitrarily set the initial virtual space to a multiple
1241 // of the boot class loader size.
1242 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1243 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1244
1245 // Initialize the list of virtual spaces.
1246 _space_list = new VirtualSpaceList(word_size);
1247 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1248
1249 if (!_space_list->initialization_succeeded()) {
1250 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1251 }
1252
1253 _tracer = new MetaspaceTracer();
1254 }
1255
1256 void Metaspace::post_initialize() {
1257 MetaspaceGC::post_initialize();
1258 }
1259
1260 void Metaspace::verify_global_initialization() {
1261 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1262 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1263
1264 if (using_class_space()) {
1265 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1266 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1267 }
1268 }
1269
1270 size_t Metaspace::align_word_size_up(size_t word_size) {
1271 size_t byte_size = word_size * wordSize;
1272 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1273 }
1274
1275 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1276 MetaspaceObj::Type type, TRAPS) {
1277 assert(!_frozen, "sanity");
1278 assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
1279
1280 if (HAS_PENDING_EXCEPTION) {
1281 assert(false, "Should not allocate with exception pending");
1282 return NULL; // caller does a CHECK_NULL too
1283 }
1284
1285 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1286 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1287
1288 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1289
1290 // Try to allocate metadata.
1291 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1292
1293 if (result == NULL) {
1294 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1295
1296 // Allocation failed.
1297 if (is_init_completed()) {
1298 // Only start a GC if the bootstrapping has completed.
1299 // Try to clean out some heap memory and retry. This can prevent premature
1300 // expansion of the metaspace.
1301 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1302 }
1303 }
1304
1305 if (result == NULL) {
1306 if (DumpSharedSpaces) {
1307 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1308 // We should abort to avoid generating a potentially bad archive.
1309 vm_exit_during_cds_dumping(err_msg("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1310 MetaspaceObj::type_name(type), word_size * BytesPerWord),
1311 err_msg("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize));
1312 }
1313 report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
1314 assert(HAS_PENDING_EXCEPTION, "sanity");
1315 return NULL;
1316 }
1317
1318 // Zero initialize.
1319 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1320
1321 return result;
1322 }
1323
1324 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1325 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1326
1327 // If result is still null, we are out of memory.
1328 Log(gc, metaspace, freelist, oom) log;
1329 if (log.is_info()) {
1330 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1331 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1332 ResourceMark rm;
1333 if (log.is_debug()) {
1334 if (loader_data->metaspace_or_null() != NULL) {
1335 LogStream ls(log.debug());
1336 loader_data->print_value_on(&ls);
1337 }
1338 }
1339 LogStream ls(log.info());
1340 // In case of an OOM, log out a short but still useful report.
1341 MetaspaceUtils::print_basic_report(&ls, 0);
1342 }
1343
1344 bool out_of_compressed_class_space = false;
1345 if (is_class_space_allocation(mdtype)) {
1346 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1347 out_of_compressed_class_space =
1348 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1349 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1350 CompressedClassSpaceSize;
1351 }
1352
1353 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1354 const char* space_string = out_of_compressed_class_space ?
1355 "Compressed class space" : "Metaspace";
1356
1357 report_java_out_of_memory(space_string);
1358
1359 if (JvmtiExport::should_post_resource_exhausted()) {
1360 JvmtiExport::post_resource_exhausted(
1361 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1362 space_string);
1363 }
1364
1365 if (!is_init_completed()) {
1366 vm_exit_during_initialization("OutOfMemoryError", space_string);
1367 }
1368
1369 if (out_of_compressed_class_space) {
1370 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1371 } else {
1372 THROW_OOP(Universe::out_of_memory_error_metaspace());
1373 }
1374 }
1375
1376 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1377 switch (mdtype) {
1378 case Metaspace::ClassType: return "Class";
1379 case Metaspace::NonClassType: return "Metadata";
1380 default:
1381 assert(false, "Got bad mdtype: %d", (int) mdtype);
1382 return NULL;
1383 }
1384 }
1385
1386 void Metaspace::purge(MetadataType mdtype) {
1387 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1388 }
1389
1390 void Metaspace::purge() {
1391 MutexLockerEx cl(MetaspaceExpand_lock,
1392 Mutex::_no_safepoint_check_flag);
1393 purge(NonClassType);
1394 if (using_class_space()) {
1395 purge(ClassType);
1396 }
1397 }
1398
1399 bool Metaspace::contains(const void* ptr) {
1400 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1401 return true;
1402 }
1403 return contains_non_shared(ptr);
1404 }
1405
1406 bool Metaspace::contains_non_shared(const void* ptr) {
1407 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1408 return true;
1409 }
1410
1411 return get_space_list(NonClassType)->contains(ptr);
1412 }
1413
1414 // ClassLoaderMetaspace
1415
1416 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1417 : _space_type(type)
1418 , _lock(lock)
1419 , _vsm(NULL)
1420 , _class_vsm(NULL)
1421 {
1422 initialize(lock, type);
1423 }
1424
1425 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1426 Metaspace::assert_not_frozen();
1427 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1428 delete _vsm;
1429 if (Metaspace::using_class_space()) {
1430 delete _class_vsm;
1431 }
1432 }
1433
1434 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1435 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1436 if (chunk != NULL) {
1437 // Add to this manager's list of chunks in use and make it the current_chunk().
1438 get_space_manager(mdtype)->add_chunk(chunk, true);
1439 }
1440 }
1441
1442 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1443 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1444
1445 // Get a chunk from the chunk freelist
1446 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1447
1448 if (chunk == NULL) {
1449 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1450 get_space_manager(mdtype)->medium_chunk_bunch());
1451 }
1452
1453 return chunk;
1454 }
1455
1456 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1457 Metaspace::verify_global_initialization();
1458
1459 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1460
1461 // Allocate SpaceManager for metadata objects.
1462 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1463
1464 if (Metaspace::using_class_space()) {
1465 // Allocate SpaceManager for classes.
1466 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1467 }
1468
1469 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1470
1471 // Allocate chunk for metadata objects
1472 initialize_first_chunk(type, Metaspace::NonClassType);
1473
1474 // Allocate chunk for class metadata objects
1475 if (Metaspace::using_class_space()) {
1476 initialize_first_chunk(type, Metaspace::ClassType);
1477 }
1478 }
1479
1480 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1481 Metaspace::assert_not_frozen();
1482
1483 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1484
1485 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1486 if (Metaspace::is_class_space_allocation(mdtype)) {
1487 return class_vsm()->allocate(word_size);
1488 } else {
1489 return vsm()->allocate(word_size);
1490 }
1491 }
1492
1493 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1494 Metaspace::assert_not_frozen();
1495 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1496 assert(delta_bytes > 0, "Must be");
1497
1498 size_t before = 0;
1499 size_t after = 0;
1500 bool can_retry = true;
1501 MetaWord* res;
1502 bool incremented;
1503
1504 // Each thread increments the HWM at most once. Even if the thread fails to increment
1505 // the HWM, an allocation is still attempted. This is because another thread must then
1506 // have incremented the HWM and therefore the allocation might still succeed.
1507 do {
1508 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before, &can_retry);
1509 res = allocate(word_size, mdtype);
1510 } while (!incremented && res == NULL && can_retry);
1511
1512 if (incremented) {
1513 Metaspace::tracer()->report_gc_threshold(before, after,
1514 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1515 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1516 }
1517
1518 return res;
1519 }
1520
1521 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1522 return (vsm()->used_words() +
1523 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1524 }
1525
1526 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1527 return (vsm()->capacity_words() +
1528 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1529 }
1530
1531 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1532 Metaspace::assert_not_frozen();
1533 assert(!SafepointSynchronize::is_at_safepoint()
1534 || Thread::current()->is_VM_thread(), "should be the VM thread");
1535
1536 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1537
1538 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1539
1540 if (is_class && Metaspace::using_class_space()) {
1541 class_vsm()->deallocate(ptr, word_size);
1542 } else {
1543 vsm()->deallocate(ptr, word_size);
1544 }
1545 }
1546
1547 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1548 assert(Metaspace::using_class_space(), "Has to use class space");
1549 return class_vsm()->calc_chunk_size(word_size);
1550 }
1551
1552 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1553 // Print both class virtual space counts and metaspace.
1554 if (Verbose) {
1555 vsm()->print_on(out);
1556 if (Metaspace::using_class_space()) {
1557 class_vsm()->print_on(out);
1558 }
1559 }
1560 }
1561
1562 void ClassLoaderMetaspace::verify() {
1563 vsm()->verify();
1564 if (Metaspace::using_class_space()) {
1565 class_vsm()->verify();
1566 }
1567 }
1568
1569 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1570 assert_lock_strong(lock());
1571 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1572 if (Metaspace::using_class_space()) {
1573 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1574 }
1575 }
1576
1577 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1578 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1579 add_to_statistics_locked(out);
1580 }
1581
1582 /////////////// Unit tests ///////////////
1583
1584 #ifndef PRODUCT
1585
1586 class TestMetaspaceUtilsTest : AllStatic {
1587 public:
1588 static void test_reserved() {
1589 size_t reserved = MetaspaceUtils::reserved_bytes();
1590
1591 assert(reserved > 0, "assert");
1592
1593 size_t committed = MetaspaceUtils::committed_bytes();
1594 assert(committed <= reserved, "assert");
1595
1596 size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType);
1597 assert(reserved_metadata > 0, "assert");
1598 assert(reserved_metadata <= reserved, "assert");
1599
1600 if (UseCompressedClassPointers) {
1601 size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType);
1602 assert(reserved_class > 0, "assert");
1603 assert(reserved_class < reserved, "assert");
1604 }
1605 }
1606
1607 static void test_committed() {
1608 size_t committed = MetaspaceUtils::committed_bytes();
1609
1610 assert(committed > 0, "assert");
1611
1612 size_t reserved = MetaspaceUtils::reserved_bytes();
1613 assert(committed <= reserved, "assert");
1614
1615 size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType);
1616 assert(committed_metadata > 0, "assert");
1617 assert(committed_metadata <= committed, "assert");
1618
1619 if (UseCompressedClassPointers) {
1620 size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
1621 assert(committed_class > 0, "assert");
1622 assert(committed_class < committed, "assert");
1623 }
1624 }
1625
1626 static void test_virtual_space_list_large_chunk() {
1627 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
1628 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1629 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
1630 // vm_allocation_granularity aligned on Windows.
1631 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
1632 large_size += (os::vm_page_size()/BytesPerWord);
1633 vs_list->get_new_chunk(large_size, 0);
1634 }
1635
1636 static void test() {
1637 test_reserved();
1638 test_committed();
1639 test_virtual_space_list_large_chunk();
1640 }
1641 };
1642
1643 void TestMetaspaceUtils_test() {
1644 TestMetaspaceUtilsTest::test();
1645 }
1646
1647 #endif // !PRODUCT
1648
1649 struct chunkmanager_statistics_t {
1650 int num_specialized_chunks;
1651 int num_small_chunks;
1652 int num_medium_chunks;
1653 int num_humongous_chunks;
1654 };
1655
1656 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1657 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1658 ChunkManagerStatistics stat;
1659 chunk_manager->collect_statistics(&stat);
1660 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1661 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1662 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1663 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1664 }
1665
1666 struct chunk_geometry_t {
1667 size_t specialized_chunk_word_size;
1668 size_t small_chunk_word_size;
1669 size_t medium_chunk_word_size;
1670 };
1671
1672 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1673 if (mdType == Metaspace::NonClassType) {
1674 out->specialized_chunk_word_size = SpecializedChunk;
1675 out->small_chunk_word_size = SmallChunk;
1676 out->medium_chunk_word_size = MediumChunk;
1677 } else {
1678 out->specialized_chunk_word_size = ClassSpecializedChunk;
1679 out->small_chunk_word_size = ClassSmallChunk;
1680 out->medium_chunk_word_size = ClassMediumChunk;
1681 }
1682 }