1 /*
2 * Copyright (c) 2011, 2018, 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
27 #include "aot/aotLoader.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::AnonymousMetaspaceType: s = "Anonymous"; 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 chunk_manager->slow_verify();
444 return chunk_manager->free_chunks_total_words();
445 }
446
447 size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
448 return free_chunks_total_words(mdtype) * BytesPerWord;
449 }
450
451 size_t MetaspaceUtils::free_chunks_total_words() {
452 return free_chunks_total_words(Metaspace::ClassType) +
453 free_chunks_total_words(Metaspace::NonClassType);
454 }
455
456 size_t MetaspaceUtils::free_chunks_total_bytes() {
457 return free_chunks_total_words() * BytesPerWord;
458 }
459
460 bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) {
461 return Metaspace::get_chunk_manager(mdtype) != NULL;
462 }
463
464 MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
465 if (!has_chunk_free_list(mdtype)) {
466 return MetaspaceChunkFreeListSummary();
467 }
468
469 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
470 return cm->chunk_free_list_summary();
471 }
472
473 void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) {
474 log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)",
475 prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K);
476 }
477
478 void MetaspaceUtils::print_on(outputStream* out) {
479 Metaspace::MetadataType nct = Metaspace::NonClassType;
480
481 out->print_cr(" Metaspace "
482 "used " SIZE_FORMAT "K, "
483 "capacity " SIZE_FORMAT "K, "
484 "committed " SIZE_FORMAT "K, "
485 "reserved " SIZE_FORMAT "K",
486 used_bytes()/K,
487 capacity_bytes()/K,
488 committed_bytes()/K,
489 reserved_bytes()/K);
490
491 if (Metaspace::using_class_space()) {
492 Metaspace::MetadataType ct = Metaspace::ClassType;
493 out->print_cr(" class space "
494 "used " SIZE_FORMAT "K, "
495 "capacity " SIZE_FORMAT "K, "
496 "committed " SIZE_FORMAT "K, "
497 "reserved " SIZE_FORMAT "K",
498 used_bytes(ct)/K,
499 capacity_bytes(ct)/K,
500 committed_bytes(ct)/K,
501 reserved_bytes(ct)/K);
502 }
503 }
504
505
506 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
507 const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
508 const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
509 {
510 if (Metaspace::using_class_space()) {
511 out->print(" Non-class space: ");
512 }
513 print_scaled_words(out, reserved_nonclass_words, scale, 7);
514 out->print(" reserved, ");
515 print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
516 out->print_cr(" committed ");
517
518 if (Metaspace::using_class_space()) {
519 const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
520 const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
521 out->print(" Class space: ");
522 print_scaled_words(out, reserved_class_words, scale, 7);
523 out->print(" reserved, ");
524 print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
525 out->print_cr(" committed ");
526
527 const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
528 const size_t committed_words = committed_nonclass_words + committed_class_words;
529 out->print(" Both: ");
530 print_scaled_words(out, reserved_words, scale, 7);
531 out->print(" reserved, ");
532 print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
533 out->print_cr(" committed ");
534 }
535 }
536 }
537
538 static void print_basic_switches(outputStream* out, size_t scale) {
539 out->print("MaxMetaspaceSize: ");
540 if (MaxMetaspaceSize >= (max_uintx) - (2 * os::vm_page_size())) {
541 // aka "very big". Default is max_uintx, but due to rounding in arg parsing the real
542 // value is smaller.
543 out->print("unlimited");
544 } else {
545 print_human_readable_size(out, MaxMetaspaceSize, scale);
546 }
547 out->cr();
548 if (Metaspace::using_class_space()) {
549 out->print("CompressedClassSpaceSize: ");
550 print_human_readable_size(out, CompressedClassSpaceSize, scale);
551 }
552 out->cr();
553 }
554
555 // This will print out a basic metaspace usage report but
556 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
557 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
558
559 if (!Metaspace::initialized()) {
560 out->print_cr("Metaspace not yet initialized.");
561 return;
562 }
563
564 out->cr();
565 out->print_cr("Usage:");
566
567 if (Metaspace::using_class_space()) {
568 out->print(" Non-class: ");
569 }
570
571 // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
572 // MetaspaceUtils.
573 const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
574 const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
575 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
576 const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
577
578 print_scaled_words(out, cap_nc, scale, 5);
579 out->print(" capacity, ");
580 print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
581 out->print(" used, ");
582 print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
583 out->print(" free+waste, ");
584 print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
585 out->print(" overhead. ");
586 out->cr();
587
588 if (Metaspace::using_class_space()) {
589 const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
590 const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
591 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
592 const size_t free_and_waste_c = cap_c - overhead_c - used_c;
593 out->print(" Class: ");
594 print_scaled_words(out, cap_c, scale, 5);
595 out->print(" capacity, ");
596 print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
597 out->print(" used, ");
598 print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
599 out->print(" free+waste, ");
600 print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
601 out->print(" overhead. ");
602 out->cr();
603
604 out->print(" Both: ");
605 const size_t cap = cap_nc + cap_c;
606
607 print_scaled_words(out, cap, scale, 5);
608 out->print(" capacity, ");
609 print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
610 out->print(" used, ");
611 print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
612 out->print(" free+waste, ");
613 print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
614 out->print(" overhead. ");
615 out->cr();
616 }
617
618 out->cr();
619 out->print_cr("Virtual space:");
620
621 print_vs(out, scale);
622
623 out->cr();
624 out->print_cr("Chunk freelists:");
625
626 if (Metaspace::using_class_space()) {
627 out->print(" Non-Class: ");
628 }
629 print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
630 out->cr();
631 if (Metaspace::using_class_space()) {
632 out->print(" Class: ");
633 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes(), scale);
634 out->cr();
635 out->print(" Both: ");
636 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes() +
637 Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
638 out->cr();
639 }
640
641 out->cr();
642
643 // Print basic settings
644 print_basic_switches(out, scale);
645
646 out->cr();
647
648 }
649
650 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
651
652 if (!Metaspace::initialized()) {
653 out->print_cr("Metaspace not yet initialized.");
654 return;
655 }
656
657 const bool print_loaders = (flags & rf_show_loaders) > 0;
658 const bool print_classes = (flags & rf_show_classes) > 0;
659 const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
660 const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
661
662 // Some report options require walking the class loader data graph.
663 PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
664 if (print_loaders) {
665 out->cr();
666 out->print_cr("Usage per loader:");
667 out->cr();
668 }
669
670 ClassLoaderDataGraph::cld_do(&cl); // collect data and optionally print
671
672 // Print totals, broken up by space type.
673 if (print_by_spacetype) {
674 out->cr();
675 out->print_cr("Usage per space type:");
676 out->cr();
677 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
678 space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
679 {
680 uintx num_loaders = cl._num_loaders_by_spacetype[space_type];
681 uintx num_classes = cl._num_classes_by_spacetype[space_type];
682 out->print("%s - " UINTX_FORMAT " %s",
683 space_type_name((Metaspace::MetaspaceType)space_type),
684 num_loaders, loaders_plural(num_loaders));
685 if (num_classes > 0) {
686 out->print(", ");
687 print_number_of_classes(out, num_classes, cl._num_classes_shared_by_spacetype[space_type]);
688 out->print(":");
689 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
690 } else {
691 out->print(".");
692 out->cr();
693 }
694 out->cr();
695 }
696 }
697
698 // Print totals for in-use data:
699 out->cr();
700 {
701 uintx num_loaders = cl._num_loaders;
702 out->print("Total Usage - " UINTX_FORMAT " %s, ",
703 num_loaders, loaders_plural(num_loaders));
704 print_number_of_classes(out, cl._num_classes, cl._num_classes_shared);
705 out->print(":");
706 cl._stats_total.print_on(out, scale, print_by_chunktype);
707 out->cr();
708 }
709
710 // -- Print Virtual space.
711 out->cr();
712 out->print_cr("Virtual space:");
713
714 print_vs(out, scale);
715
716 // -- Print VirtualSpaceList details.
717 if ((flags & rf_show_vslist) > 0) {
718 out->cr();
719 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
720
721 if (Metaspace::using_class_space()) {
722 out->print_cr(" Non-Class:");
723 }
724 Metaspace::space_list()->print_on(out, scale);
725 if (Metaspace::using_class_space()) {
726 out->print_cr(" Class:");
727 Metaspace::class_space_list()->print_on(out, scale);
728 }
729 }
730 out->cr();
731
732 // -- Print VirtualSpaceList map.
733 if ((flags & rf_show_vsmap) > 0) {
734 out->cr();
735 out->print_cr("Virtual space map:");
736
737 if (Metaspace::using_class_space()) {
738 out->print_cr(" Non-Class:");
739 }
740 Metaspace::space_list()->print_map(out);
741 if (Metaspace::using_class_space()) {
742 out->print_cr(" Class:");
743 Metaspace::class_space_list()->print_map(out);
744 }
745 }
746 out->cr();
747
748 // -- Print Freelists (ChunkManager) details
749 out->cr();
750 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
751
752 ChunkManagerStatistics non_class_cm_stat;
753 Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
754
755 if (Metaspace::using_class_space()) {
756 out->print_cr(" Non-Class:");
757 }
758 non_class_cm_stat.print_on(out, scale);
759
760 if (Metaspace::using_class_space()) {
761 ChunkManagerStatistics class_cm_stat;
762 Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
763 out->print_cr(" Class:");
764 class_cm_stat.print_on(out, scale);
765 }
766
767 // As a convenience, print a summary of common waste.
768 out->cr();
769 out->print("Waste ");
770 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
771 const size_t committed_words = committed_bytes() / BytesPerWord;
772
773 out->print("(percentages refer to total committed size ");
774 print_scaled_words(out, committed_words, scale);
775 out->print_cr("):");
776
777 // Print space committed but not yet used by any class loader
778 const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
779 out->print(" Committed unused: ");
780 print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
781 out->cr();
782
783 // Print waste for in-use chunks.
784 UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
785 UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
786 UsedChunksStatistics ucs_all;
787 ucs_all.add(ucs_nonclass);
788 ucs_all.add(ucs_class);
789
790 out->print(" Waste in chunks in use: ");
791 print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
792 out->cr();
793 out->print(" Free in chunks in use: ");
794 print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
795 out->cr();
796 out->print(" Overhead in chunks in use: ");
797 print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
798 out->cr();
799
800 // Print waste in free chunks.
801 const size_t total_capacity_in_free_chunks =
802 Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
803 (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
804 out->print(" In free chunks: ");
805 print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
806 out->cr();
807
808 // Print waste in deallocated blocks.
809 const uintx free_blocks_num =
810 cl._stats_total.nonclass_sm_stats().free_blocks_num() +
811 cl._stats_total.class_sm_stats().free_blocks_num();
812 const size_t free_blocks_cap_words =
813 cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
814 cl._stats_total.class_sm_stats().free_blocks_cap_words();
815 out->print("Deallocated from chunks in use: ");
816 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
817 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
818 out->cr();
819
820 // Print total waste.
821 const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
822 + free_blocks_cap_words + unused_words_in_vs;
823 out->print(" -total-: ");
824 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
825 out->cr();
826
827 // Print internal statistics
828 #ifdef ASSERT
829 out->cr();
830 out->cr();
831 out->print_cr("Internal statistics:");
832 out->cr();
833 out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
834 out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
835 out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
836 out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
837 out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
838 out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
839 out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
840 out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
841 out->cr();
842 #endif
843
844 // Print some interesting settings
845 out->cr();
846 out->cr();
847 print_basic_switches(out, scale);
848
849 out->cr();
850 out->print("InitialBootClassLoaderMetaspaceSize: ");
851 print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
852
853 out->cr();
854 out->cr();
855
856 } // MetaspaceUtils::print_report()
857
858 // Prints an ASCII representation of the given space.
859 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
860 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
861 const bool for_class = mdtype == Metaspace::ClassType ? true : false;
862 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
863 if (vsl != NULL) {
864 if (for_class) {
865 if (!Metaspace::using_class_space()) {
866 out->print_cr("No Class Space.");
867 return;
868 }
869 out->print_raw("---- Metaspace Map (Class Space) ----");
870 } else {
871 out->print_raw("---- Metaspace Map (Non-Class Space) ----");
872 }
873 // Print legend:
874 out->cr();
875 out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
876 out->cr();
877 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
878 vsl->print_map(out);
879 out->cr();
880 }
881 }
882
883 void MetaspaceUtils::verify_free_chunks() {
884 Metaspace::chunk_manager_metadata()->verify();
885 if (Metaspace::using_class_space()) {
886 Metaspace::chunk_manager_class()->verify();
887 }
888 }
889
890 void MetaspaceUtils::verify_metrics() {
891 #ifdef ASSERT
892 // Please note: there are time windows where the internal counters are out of sync with
893 // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
894 // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
895 // not be counted when iterating the CLDG. So be careful when you call this method.
896 ClassLoaderMetaspaceStatistics total_stat;
897 collect_statistics(&total_stat);
898 UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
899 UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
900
901 bool mismatch = false;
902 for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
903 Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
904 UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
905 if (capacity_words(mdtype) != chunk_stat.cap() ||
906 used_words(mdtype) != chunk_stat.used() ||
907 overhead_words(mdtype) != chunk_stat.overhead()) {
908 mismatch = true;
909 tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
910 tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
911 capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
912 tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
913 chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
914 tty->flush();
915 }
916 }
917 assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
918 #endif
919 }
920
921 // Utils to check if a pointer or range is part of a committed metaspace region.
922 metaspace::VirtualSpaceNode* MetaspaceUtils::find_enclosing_virtual_space(const void* p) {
923 VirtualSpaceNode* vsn = Metaspace::space_list()->find_enclosing_space(p);
924 if (Metaspace::using_class_space() && vsn == NULL) {
925 vsn = Metaspace::class_space_list()->find_enclosing_space(p);
926 }
927 return vsn;
928 }
929
930 bool MetaspaceUtils::is_in_committed(const void* p) {
931 #if INCLUDE_CDS
932 if (UseSharedSpaces) {
933 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
934 if (FileMapInfo::current_info()->is_in_shared_region(p, idx)) {
935 return true;
936 }
937 }
938 }
939 #endif
940 return find_enclosing_virtual_space(p) != NULL;
941 }
942
943 bool MetaspaceUtils::is_range_in_committed(const void* from, const void* to) {
944 #if INCLUDE_CDS
945 if (UseSharedSpaces) {
946 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
947 if (FileMapInfo::current_info()->is_in_shared_region(from, idx)) {
948 return FileMapInfo::current_info()->is_in_shared_region(to, idx);
949 }
950 }
951 }
952 #endif
953 VirtualSpaceNode* vsn = find_enclosing_virtual_space(from);
954 return (vsn != NULL) && vsn->contains(to);
955 }
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(address metaspace_base, 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;
986 address higher_address;
987 #if INCLUDE_CDS
988 if (UseSharedSpaces) {
989 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
990 (address)(metaspace_base + compressed_class_space_size()));
991 lower_base = MIN2(metaspace_base, cds_base);
992 } else
993 #endif
994 {
995 higher_address = metaspace_base + compressed_class_space_size();
996 lower_base = metaspace_base;
997
998 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
999 // If compressed class space fits in lower 32G, we don't need a base.
1000 if (higher_address <= (address)klass_encoding_max) {
1001 lower_base = 0; // Effectively lower base is zero.
1002 }
1003 }
1004
1005 Universe::set_narrow_klass_base(lower_base);
1006
1007 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
1008 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
1009 // how dump time narrow_klass_shift is set. Although, CDS can work
1010 // with zero-shift mode also, to be consistent with AOT it uses
1011 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
1012 // can be used at same time as AOT code.
1013 if (!UseSharedSpaces
1014 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
1015 Universe::set_narrow_klass_shift(0);
1016 } else {
1017 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
1018 }
1019 AOTLoader::set_narrow_klass_shift();
1020 }
1021
1022 #if INCLUDE_CDS
1023 // Return TRUE if the specified metaspace_base and cds_base are close enough
1024 // to work with compressed klass pointers.
1025 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
1026 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
1027 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
1028 address lower_base = MIN2((address)metaspace_base, cds_base);
1029 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
1030 (address)(metaspace_base + compressed_class_space_size()));
1031 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
1032 }
1033 #endif
1034
1035 // Try to allocate the metaspace at the requested addr.
1036 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
1037 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
1038 assert(using_class_space(), "called improperly");
1039 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
1040 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
1041 "Metaspace size is too big");
1042 assert_is_aligned(requested_addr, _reserve_alignment);
1043 assert_is_aligned(cds_base, _reserve_alignment);
1044 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
1045
1046 // Don't use large pages for the class space.
1047 bool large_pages = false;
1048
1049 #if !(defined(AARCH64) || defined(PPC64))
1050 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
1051 _reserve_alignment,
1052 large_pages,
1053 requested_addr);
1054 #else // AARCH64 || PPC64
1055
1056 ReservedSpace metaspace_rs;
1057
1058 // Our compressed klass pointers may fit nicely into the lower 32
1059 // bits.
1060 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
1061 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1062 _reserve_alignment,
1063 large_pages,
1064 requested_addr);
1065 }
1066
1067 if (! metaspace_rs.is_reserved()) {
1068 // Aarch64: Try to align metaspace so that we can decode a compressed
1069 // klass with a single MOVK instruction. We can do this iff the
1070 // compressed class base is a multiple of 4G.
1071 // Aix: Search for a place where we can find memory. If we need to load
1072 // the base, 4G alignment is helpful, too.
1073 // PPC64: smaller heaps up to 2g will be mapped just below 4g. Then the
1074 // attempt to place the compressed class space just after the heap fails on
1075 // Linux 4.1.42 and higher because the launcher is loaded at 4g
1076 // (ELF_ET_DYN_BASE). In that case we reach here and search the address space
1077 // below 32g to get a zerobased CCS. For simplicity we reuse the search
1078 // strategy for AARCH64.
1079
1080 size_t increment = AARCH64_ONLY(4*)G;
1081 for (char *a = align_up(requested_addr, increment);
1082 a < (char*)(1024*G);
1083 a += increment) {
1084 if (a == (char *)(32*G)) {
1085 // Go faster from here on. Zero-based is no longer possible.
1086 increment = 4*G;
1087 }
1088
1089 #if INCLUDE_CDS
1090 if (UseSharedSpaces
1091 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
1092 // We failed to find an aligned base that will reach. Fall
1093 // back to using our requested addr.
1094 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1095 _reserve_alignment,
1096 large_pages,
1097 requested_addr);
1098 break;
1099 }
1100 #endif
1101
1102 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1103 _reserve_alignment,
1104 large_pages,
1105 a);
1106 if (metaspace_rs.is_reserved())
1107 break;
1108 }
1109 }
1110
1111 #endif // AARCH64
1112
1113 if (!metaspace_rs.is_reserved()) {
1114 #if INCLUDE_CDS
1115 if (UseSharedSpaces) {
1116 size_t increment = align_up(1*G, _reserve_alignment);
1117
1118 // Keep trying to allocate the metaspace, increasing the requested_addr
1119 // by 1GB each time, until we reach an address that will no longer allow
1120 // use of CDS with compressed klass pointers.
1121 char *addr = requested_addr;
1122 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1123 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1124 addr = addr + increment;
1125 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1126 _reserve_alignment, large_pages, addr);
1127 }
1128 }
1129 #endif
1130 // If no successful allocation then try to allocate the space anywhere. If
1131 // that fails then OOM doom. At this point we cannot try allocating the
1132 // metaspace as if UseCompressedClassPointers is off because too much
1133 // initialization has happened that depends on UseCompressedClassPointers.
1134 // So, UseCompressedClassPointers cannot be turned off at this point.
1135 if (!metaspace_rs.is_reserved()) {
1136 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1137 _reserve_alignment, large_pages);
1138 if (!metaspace_rs.is_reserved()) {
1139 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1140 compressed_class_space_size()));
1141 }
1142 }
1143 }
1144
1145 // If we got here then the metaspace got allocated.
1146 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1147
1148 #if INCLUDE_CDS
1149 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1150 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1151 FileMapInfo::stop_sharing_and_unmap(
1152 "Could not allocate metaspace at a compatible address");
1153 }
1154 #endif
1155 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1156 UseSharedSpaces ? (address)cds_base : 0);
1157
1158 initialize_class_space(metaspace_rs);
1159
1160 LogTarget(Trace, gc, metaspace) lt;
1161 if (lt.is_enabled()) {
1162 ResourceMark rm;
1163 LogStream ls(lt);
1164 print_compressed_class_space(&ls, requested_addr);
1165 }
1166 }
1167
1168 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1169 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1170 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1171 if (_class_space_list != NULL) {
1172 address base = (address)_class_space_list->current_virtual_space()->bottom();
1173 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1174 compressed_class_space_size(), p2i(base));
1175 if (requested_addr != 0) {
1176 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1177 }
1178 st->cr();
1179 }
1180 }
1181
1182 // For UseCompressedClassPointers the class space is reserved above the top of
1183 // the Java heap. The argument passed in is at the base of the compressed space.
1184 void Metaspace::initialize_class_space(ReservedSpace rs) {
1185 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1186 assert(rs.size() >= CompressedClassSpaceSize,
1187 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1188 assert(using_class_space(), "Must be using class space");
1189 _class_space_list = new VirtualSpaceList(rs);
1190 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1191
1192 if (!_class_space_list->initialization_succeeded()) {
1193 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1194 }
1195 }
1196
1197 #endif
1198
1199 void Metaspace::ergo_initialize() {
1200 if (DumpSharedSpaces) {
1201 // Using large pages when dumping the shared archive is currently not implemented.
1202 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1203 }
1204
1205 size_t page_size = os::vm_page_size();
1206 if (UseLargePages && UseLargePagesInMetaspace) {
1207 page_size = os::large_page_size();
1208 }
1209
1210 _commit_alignment = page_size;
1211 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1212
1213 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1214 // override if MaxMetaspaceSize was set on the command line or not.
1215 // This information is needed later to conform to the specification of the
1216 // java.lang.management.MemoryUsage API.
1217 //
1218 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1219 // globals.hpp to the aligned value, but this is not possible, since the
1220 // alignment depends on other flags being parsed.
1221 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1222
1223 if (MetaspaceSize > MaxMetaspaceSize) {
1224 MetaspaceSize = MaxMetaspaceSize;
1225 }
1226
1227 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1228
1229 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1230
1231 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1232 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1233
1234 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1235
1236 // Initial virtual space size will be calculated at global_initialize()
1237 size_t min_metaspace_sz =
1238 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1239 if (UseCompressedClassPointers) {
1240 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1241 if (min_metaspace_sz >= MaxMetaspaceSize) {
1242 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1243 } else {
1244 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1245 MaxMetaspaceSize - min_metaspace_sz);
1246 }
1247 }
1248 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1249 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1250 min_metaspace_sz);
1251 }
1252
1253 set_compressed_class_space_size(CompressedClassSpaceSize);
1254 }
1255
1256 void Metaspace::global_initialize() {
1257 MetaspaceGC::initialize();
1258
1259 #if INCLUDE_CDS
1260 if (DumpSharedSpaces) {
1261 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1262 } else if (UseSharedSpaces) {
1263 // If any of the archived space fails to map, UseSharedSpaces
1264 // is reset to false. Fall through to the
1265 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1266 // metaspace.
1267 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1268 }
1269
1270 if (!DumpSharedSpaces && !UseSharedSpaces)
1271 #endif // INCLUDE_CDS
1272 {
1273 #ifdef _LP64
1274 if (using_class_space()) {
1275 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1276 allocate_metaspace_compressed_klass_ptrs(base, 0);
1277 }
1278 #endif // _LP64
1279 }
1280
1281 // Initialize these before initializing the VirtualSpaceList
1282 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1283 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1284 // Make the first class chunk bigger than a medium chunk so it's not put
1285 // on the medium chunk list. The next chunk will be small and progress
1286 // from there. This size calculated by -version.
1287 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1288 (CompressedClassSpaceSize/BytesPerWord)*2);
1289 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1290 // Arbitrarily set the initial virtual space to a multiple
1291 // of the boot class loader size.
1292 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1293 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1294
1295 // Initialize the list of virtual spaces.
1296 _space_list = new VirtualSpaceList(word_size);
1297 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1298
1299 if (!_space_list->initialization_succeeded()) {
1300 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1301 }
1302
1303 _tracer = new MetaspaceTracer();
1304
1305 _initialized = true;
1306
1307 }
1308
1309 void Metaspace::post_initialize() {
1310 MetaspaceGC::post_initialize();
1311 }
1312
1313 void Metaspace::verify_global_initialization() {
1314 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1315 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1316
1317 if (using_class_space()) {
1318 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1319 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1320 }
1321 }
1322
1323 size_t Metaspace::align_word_size_up(size_t word_size) {
1324 size_t byte_size = word_size * wordSize;
1325 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1326 }
1327
1328 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1329 MetaspaceObj::Type type, TRAPS) {
1330 assert(!_frozen, "sanity");
1331 assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
1332
1333 if (HAS_PENDING_EXCEPTION) {
1334 assert(false, "Should not allocate with exception pending");
1335 return NULL; // caller does a CHECK_NULL too
1336 }
1337
1338 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1339 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1340
1341 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1342
1343 // Try to allocate metadata.
1344 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1345
1346 if (result == NULL) {
1347 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1348
1349 // Allocation failed.
1350 if (is_init_completed()) {
1351 // Only start a GC if the bootstrapping has completed.
1352 // Try to clean out some heap memory and retry. This can prevent premature
1353 // expansion of the metaspace.
1354 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1355 }
1356 }
1357
1358 if (result == NULL) {
1359 if (DumpSharedSpaces) {
1360 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1361 // We should abort to avoid generating a potentially bad archive.
1362 tty->print_cr("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1363 MetaspaceObj::type_name(type), word_size * BytesPerWord);
1364 tty->print_cr("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize);
1365 vm_exit(1);
1366 }
1367 report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
1368 assert(HAS_PENDING_EXCEPTION, "sanity");
1369 return NULL;
1370 }
1371
1372 // Zero initialize.
1373 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1374
1375 return result;
1376 }
1377
1378 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1379 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1380
1381 // If result is still null, we are out of memory.
1382 Log(gc, metaspace, freelist, oom) log;
1383 if (log.is_info()) {
1384 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1385 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1386 ResourceMark rm;
1387 if (log.is_debug()) {
1388 if (loader_data->metaspace_or_null() != NULL) {
1389 LogStream ls(log.debug());
1390 loader_data->print_value_on(&ls);
1391 }
1392 }
1393 LogStream ls(log.info());
1394 // In case of an OOM, log out a short but still useful report.
1395 MetaspaceUtils::print_basic_report(&ls, 0);
1396 }
1397
1398 bool out_of_compressed_class_space = false;
1399 if (is_class_space_allocation(mdtype)) {
1400 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1401 out_of_compressed_class_space =
1402 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1403 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1404 CompressedClassSpaceSize;
1405 }
1406
1407 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1408 const char* space_string = out_of_compressed_class_space ?
1409 "Compressed class space" : "Metaspace";
1410
1411 report_java_out_of_memory(space_string);
1412
1413 if (JvmtiExport::should_post_resource_exhausted()) {
1414 JvmtiExport::post_resource_exhausted(
1415 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1416 space_string);
1417 }
1418
1419 if (!is_init_completed()) {
1420 vm_exit_during_initialization("OutOfMemoryError", space_string);
1421 }
1422
1423 if (out_of_compressed_class_space) {
1424 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1425 } else {
1426 THROW_OOP(Universe::out_of_memory_error_metaspace());
1427 }
1428 }
1429
1430 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1431 switch (mdtype) {
1432 case Metaspace::ClassType: return "Class";
1433 case Metaspace::NonClassType: return "Metadata";
1434 default:
1435 assert(false, "Got bad mdtype: %d", (int) mdtype);
1436 return NULL;
1437 }
1438 }
1439
1440 void Metaspace::purge(MetadataType mdtype) {
1441 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1442 }
1443
1444 void Metaspace::purge() {
1445 MutexLockerEx cl(MetaspaceExpand_lock,
1446 Mutex::_no_safepoint_check_flag);
1447 purge(NonClassType);
1448 if (using_class_space()) {
1449 purge(ClassType);
1450 }
1451 }
1452
1453 bool Metaspace::contains(const void* ptr) {
1454 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1455 return true;
1456 }
1457 return contains_non_shared(ptr);
1458 }
1459
1460 bool Metaspace::contains_non_shared(const void* ptr) {
1461 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1462 return true;
1463 }
1464
1465 return get_space_list(NonClassType)->contains(ptr);
1466 }
1467
1468 // ClassLoaderMetaspace
1469
1470 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1471 : _lock(lock)
1472 , _space_type(type)
1473 , _vsm(NULL)
1474 , _class_vsm(NULL)
1475 {
1476 initialize(lock, type);
1477 }
1478
1479 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1480 Metaspace::assert_not_frozen();
1481 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1482 delete _vsm;
1483 if (Metaspace::using_class_space()) {
1484 delete _class_vsm;
1485 }
1486 }
1487
1488 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1489 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1490 if (chunk != NULL) {
1491 // Add to this manager's list of chunks in use and make it the current_chunk().
1492 get_space_manager(mdtype)->add_chunk(chunk, true);
1493 }
1494 }
1495
1496 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1497 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1498
1499 // Get a chunk from the chunk freelist
1500 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1501
1502 if (chunk == NULL) {
1503 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1504 get_space_manager(mdtype)->medium_chunk_bunch());
1505 }
1506
1507 return chunk;
1508 }
1509
1510 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1511 Metaspace::verify_global_initialization();
1512
1513 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1514
1515 // Allocate SpaceManager for metadata objects.
1516 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1517
1518 if (Metaspace::using_class_space()) {
1519 // Allocate SpaceManager for classes.
1520 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1521 }
1522
1523 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1524
1525 // Allocate chunk for metadata objects
1526 initialize_first_chunk(type, Metaspace::NonClassType);
1527
1528 // Allocate chunk for class metadata objects
1529 if (Metaspace::using_class_space()) {
1530 initialize_first_chunk(type, Metaspace::ClassType);
1531 }
1532 }
1533
1534 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1535 Metaspace::assert_not_frozen();
1536
1537 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1538
1539 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1540 if (Metaspace::is_class_space_allocation(mdtype)) {
1541 return class_vsm()->allocate(word_size);
1542 } else {
1543 return vsm()->allocate(word_size);
1544 }
1545 }
1546
1547 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1548 Metaspace::assert_not_frozen();
1549 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1550 assert(delta_bytes > 0, "Must be");
1551
1552 size_t before = 0;
1553 size_t after = 0;
1554 bool can_retry = true;
1555 MetaWord* res;
1556 bool incremented;
1557
1558 // Each thread increments the HWM at most once. Even if the thread fails to increment
1559 // the HWM, an allocation is still attempted. This is because another thread must then
1560 // have incremented the HWM and therefore the allocation might still succeed.
1561 do {
1562 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before, &can_retry);
1563 res = allocate(word_size, mdtype);
1564 } while (!incremented && res == NULL && can_retry);
1565
1566 if (incremented) {
1567 Metaspace::tracer()->report_gc_threshold(before, after,
1568 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1569 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1570 }
1571
1572 return res;
1573 }
1574
1575 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1576 return (vsm()->used_words() +
1577 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1578 }
1579
1580 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1581 return (vsm()->capacity_words() +
1582 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1583 }
1584
1585 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1586 Metaspace::assert_not_frozen();
1587 assert(!SafepointSynchronize::is_at_safepoint()
1588 || Thread::current()->is_VM_thread(), "should be the VM thread");
1589
1590 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1591
1592 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1593
1594 if (is_class && Metaspace::using_class_space()) {
1595 class_vsm()->deallocate(ptr, word_size);
1596 } else {
1597 vsm()->deallocate(ptr, word_size);
1598 }
1599 }
1600
1601 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1602 assert(Metaspace::using_class_space(), "Has to use class space");
1603 return class_vsm()->calc_chunk_size(word_size);
1604 }
1605
1606 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1607 // Print both class virtual space counts and metaspace.
1608 if (Verbose) {
1609 vsm()->print_on(out);
1610 if (Metaspace::using_class_space()) {
1611 class_vsm()->print_on(out);
1612 }
1613 }
1614 }
1615
1616 void ClassLoaderMetaspace::verify() {
1617 vsm()->verify();
1618 if (Metaspace::using_class_space()) {
1619 class_vsm()->verify();
1620 }
1621 }
1622
1623 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1624 assert_lock_strong(lock());
1625 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1626 if (Metaspace::using_class_space()) {
1627 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1628 }
1629 }
1630
1631 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1632 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1633 add_to_statistics_locked(out);
1634 }
1635
1636 /////////////// Unit tests ///////////////
1637
1638 #ifndef PRODUCT
1639
1640 class TestVirtualSpaceNodeTest {
1641 static void chunk_up(size_t words_left, size_t& num_medium_chunks,
1642 size_t& num_small_chunks,
1643 size_t& num_specialized_chunks) {
1644 num_medium_chunks = words_left / MediumChunk;
1645 words_left = words_left % MediumChunk;
1646
1647 num_small_chunks = words_left / SmallChunk;
1648 words_left = words_left % SmallChunk;
1649 // how many specialized chunks can we get?
1650 num_specialized_chunks = words_left / SpecializedChunk;
1651 assert(words_left % SpecializedChunk == 0, "should be nothing left");
1652 }
1653
1654 public:
1655 static void test() {
1656 MutexLockerEx ml(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1657 const size_t vsn_test_size_words = MediumChunk * 4;
1658 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
1659
1660 // The chunk sizes must be multiples of eachother, or this will fail
1661 STATIC_ASSERT(MediumChunk % SmallChunk == 0);
1662 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
1663
1664 { // No committed memory in VSN
1665 ChunkManager cm(false);
1666 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1667 vsn.initialize();
1668 vsn.retire(&cm);
1669 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
1670 }
1671
1672 { // All of VSN is committed, half is used by chunks
1673 ChunkManager cm(false);
1674 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1675 vsn.initialize();
1676 vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
1677 vsn.get_chunk_vs(MediumChunk);
1678 vsn.get_chunk_vs(MediumChunk);
1679 vsn.retire(&cm);
1680 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
1681 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
1682 }
1683
1684 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
1685 // This doesn't work for systems with vm_page_size >= 16K.
1686 if (page_chunks < MediumChunk) {
1687 // 4 pages of VSN is committed, some is used by chunks
1688 ChunkManager cm(false);
1689 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1690
1691 vsn.initialize();
1692 vsn.expand_by(page_chunks, page_chunks);
1693 vsn.get_chunk_vs(SmallChunk);
1694 vsn.get_chunk_vs(SpecializedChunk);
1695 vsn.retire(&cm);
1696
1697 // committed - used = words left to retire
1698 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
1699
1700 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1701 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1702
1703 assert(num_medium_chunks == 0, "should not get any medium chunks");
1704 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1705 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1706 }
1707
1708 { // Half of VSN is committed, a humongous chunk is used
1709 ChunkManager cm(false);
1710 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1711 vsn.initialize();
1712 vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
1713 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
1714 vsn.retire(&cm);
1715
1716 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
1717 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1718 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1719
1720 assert(num_medium_chunks == 0, "should not get any medium chunks");
1721 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1722 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1723 }
1724
1725 }
1726
1727 #define assert_is_available_positive(word_size) \
1728 assert(vsn.is_available(word_size), \
1729 #word_size ": " PTR_FORMAT " bytes were not available in " \
1730 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1731 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1732
1733 #define assert_is_available_negative(word_size) \
1734 assert(!vsn.is_available(word_size), \
1735 #word_size ": " PTR_FORMAT " bytes should not be available in " \
1736 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1737 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1738
1739 static void test_is_available_positive() {
1740 // Reserve some memory.
1741 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1742 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1743
1744 // Commit some memory.
1745 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1746 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1747 assert(expanded, "Failed to commit");
1748
1749 // Check that is_available accepts the committed size.
1750 assert_is_available_positive(commit_word_size);
1751
1752 // Check that is_available accepts half the committed size.
1753 size_t expand_word_size = commit_word_size / 2;
1754 assert_is_available_positive(expand_word_size);
1755 }
1756
1757 static void test_is_available_negative() {
1758 // Reserve some memory.
1759 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1760 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1761
1762 // Commit some memory.
1763 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1764 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1765 assert(expanded, "Failed to commit");
1766
1767 // Check that is_available doesn't accept a too large size.
1768 size_t two_times_commit_word_size = commit_word_size * 2;
1769 assert_is_available_negative(two_times_commit_word_size);
1770 }
1771
1772 static void test_is_available_overflow() {
1773 // Reserve some memory.
1774 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1775 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1776
1777 // Commit some memory.
1778 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1779 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1780 assert(expanded, "Failed to commit");
1781
1782 // Calculate a size that will overflow the virtual space size.
1783 void* virtual_space_max = (void*)(uintptr_t)-1;
1784 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
1785 size_t overflow_size = bottom_to_max + BytesPerWord;
1786 size_t overflow_word_size = overflow_size / BytesPerWord;
1787
1788 // Check that is_available can handle the overflow.
1789 assert_is_available_negative(overflow_word_size);
1790 }
1791
1792 static void test_is_available() {
1793 TestVirtualSpaceNodeTest::test_is_available_positive();
1794 TestVirtualSpaceNodeTest::test_is_available_negative();
1795 TestVirtualSpaceNodeTest::test_is_available_overflow();
1796 }
1797 };
1798
1799 #endif // !PRODUCT
1800
1801 struct chunkmanager_statistics_t {
1802 int num_specialized_chunks;
1803 int num_small_chunks;
1804 int num_medium_chunks;
1805 int num_humongous_chunks;
1806 };
1807
1808 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1809 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1810 ChunkManagerStatistics stat;
1811 chunk_manager->collect_statistics(&stat);
1812 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1813 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1814 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1815 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1816 }
1817
1818 struct chunk_geometry_t {
1819 size_t specialized_chunk_word_size;
1820 size_t small_chunk_word_size;
1821 size_t medium_chunk_word_size;
1822 };
1823
1824 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1825 if (mdType == Metaspace::NonClassType) {
1826 out->specialized_chunk_word_size = SpecializedChunk;
1827 out->small_chunk_word_size = SmallChunk;
1828 out->medium_chunk_word_size = MediumChunk;
1829 } else {
1830 out->specialized_chunk_word_size = ClassSpecializedChunk;
1831 out->small_chunk_word_size = ClassSmallChunk;
1832 out->medium_chunk_word_size = ClassMediumChunk;
1833 }
1834 }