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