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 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
136 assert_is_aligned(v, Metaspace::commit_alignment());
137
138 size_t old_capacity_until_GC = _capacity_until_GC;
139 size_t new_value = old_capacity_until_GC + v;
140
141 if (new_value < old_capacity_until_GC) {
142 // The addition wrapped around, set new_value to aligned max value.
143 new_value = align_down(max_uintx, Metaspace::commit_alignment());
144 }
145
146 size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
147
148 if (old_capacity_until_GC != prev_value) {
149 return false;
150 }
151
152 if (new_cap_until_GC != NULL) {
153 *new_cap_until_GC = new_value;
154 }
155 if (old_cap_until_GC != NULL) {
156 *old_cap_until_GC = old_capacity_until_GC;
157 }
158 return true;
159 }
160
161 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
162 assert_is_aligned(v, Metaspace::commit_alignment());
163
164 return Atomic::sub(v, &_capacity_until_GC);
165 }
166
167 void MetaspaceGC::initialize() {
168 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
169 // we can't do a GC during initialization.
170 _capacity_until_GC = MaxMetaspaceSize;
171 }
172
173 void MetaspaceGC::post_initialize() {
174 // Reset the high-water mark once the VM initialization is done.
175 _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
176 }
177
178 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
179 // Check if the compressed class space is full.
180 if (is_class && Metaspace::using_class_space()) {
181 size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
182 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
183 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
184 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
185 return false;
186 }
187 }
188
189 // Check if the user has imposed a limit on the metaspace memory.
190 size_t committed_bytes = MetaspaceUtils::committed_bytes();
191 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
192 log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
193 (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
194 return false;
195 }
196
197 return true;
198 }
199
200 size_t MetaspaceGC::allowed_expansion() {
201 size_t committed_bytes = MetaspaceUtils::committed_bytes();
202 size_t capacity_until_gc = capacity_until_GC();
203
204 assert(capacity_until_gc >= committed_bytes,
205 "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
206 capacity_until_gc, committed_bytes);
207
208 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
209 size_t left_until_GC = capacity_until_gc - committed_bytes;
210 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
211 log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
212 " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
213 left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
214
215 return left_to_commit / BytesPerWord;
216 }
217
218 void MetaspaceGC::compute_new_size() {
219 assert(_shrink_factor <= 100, "invalid shrink factor");
220 uint current_shrink_factor = _shrink_factor;
221 _shrink_factor = 0;
222
223 // Using committed_bytes() for used_after_gc is an overestimation, since the
224 // chunk free lists are included in committed_bytes() and the memory in an
225 // un-fragmented chunk free list is available for future allocations.
226 // However, if the chunk free lists becomes fragmented, then the memory may
227 // not be available for future allocations and the memory is therefore "in use".
228 // Including the chunk free lists in the definition of "in use" is therefore
229 // necessary. Not including the chunk free lists can cause capacity_until_GC to
230 // shrink below committed_bytes() and this has caused serious bugs in the past.
231 const size_t used_after_gc = MetaspaceUtils::committed_bytes();
232 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
233
234 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
235 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
236
237 const double min_tmp = used_after_gc / maximum_used_percentage;
238 size_t minimum_desired_capacity =
239 (size_t)MIN2(min_tmp, double(max_uintx));
240 // Don't shrink less than the initial generation size
241 minimum_desired_capacity = MAX2(minimum_desired_capacity,
242 MetaspaceSize);
243
244 log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
245 log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f",
246 minimum_free_percentage, maximum_used_percentage);
247 log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K);
248
249
250 size_t shrink_bytes = 0;
251 if (capacity_until_GC < minimum_desired_capacity) {
252 // If we have less capacity below the metaspace HWM, then
253 // increment the HWM.
254 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
255 expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
256 // Don't expand unless it's significant
257 if (expand_bytes >= MinMetaspaceExpansion) {
258 size_t new_capacity_until_GC = 0;
259 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
260 assert(succeeded, "Should always succesfully increment HWM when at safepoint");
261
262 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
263 new_capacity_until_GC,
264 MetaspaceGCThresholdUpdater::ComputeNewSize);
265 log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB",
266 minimum_desired_capacity / (double) K,
267 expand_bytes / (double) K,
268 MinMetaspaceExpansion / (double) K,
269 new_capacity_until_GC / (double) K);
270 }
271 return;
272 }
273
274 // No expansion, now see if we want to shrink
275 // We would never want to shrink more than this
276 assert(capacity_until_GC >= minimum_desired_capacity,
277 SIZE_FORMAT " >= " SIZE_FORMAT,
278 capacity_until_GC, minimum_desired_capacity);
279 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
280
281 // Should shrinking be considered?
282 if (MaxMetaspaceFreeRatio < 100) {
283 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
284 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
285 const double max_tmp = used_after_gc / minimum_used_percentage;
286 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
287 maximum_desired_capacity = MAX2(maximum_desired_capacity,
288 MetaspaceSize);
289 log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f",
290 maximum_free_percentage, minimum_used_percentage);
291 log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB",
292 minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
293
294 assert(minimum_desired_capacity <= maximum_desired_capacity,
295 "sanity check");
296
297 if (capacity_until_GC > maximum_desired_capacity) {
298 // Capacity too large, compute shrinking size
299 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
300 // We don't want shrink all the way back to initSize if people call
301 // System.gc(), because some programs do that between "phases" and then
302 // we'd just have to grow the heap up again for the next phase. So we
303 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
304 // on the third call, and 100% by the fourth call. But if we recompute
305 // size without shrinking, it goes back to 0%.
306 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
307
308 shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
309
310 assert(shrink_bytes <= max_shrink_bytes,
311 "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
312 shrink_bytes, max_shrink_bytes);
313 if (current_shrink_factor == 0) {
314 _shrink_factor = 10;
315 } else {
316 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
317 }
318 log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK",
319 MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
320 log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK",
321 shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
322 }
323 }
324
325 // Don't shrink unless it's significant
326 if (shrink_bytes >= MinMetaspaceExpansion &&
327 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
328 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
329 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
330 new_capacity_until_GC,
331 MetaspaceGCThresholdUpdater::ComputeNewSize);
332 }
333 }
334
335 // MetaspaceUtils
336 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
337 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
338 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
339
340 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
341 // output will be the accumulated values for all live metaspaces.
342 // Note: method does not do any locking.
343 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
344 out->reset();
345 ClassLoaderDataGraphMetaspaceIterator iter;
346 while (iter.repeat()) {
347 ClassLoaderMetaspace* msp = iter.get_next();
348 if (msp != NULL) {
349 msp->add_to_statistics(out);
350 }
351 }
352 }
353
354 size_t MetaspaceUtils::free_in_vs_bytes(Metaspace::MetadataType mdtype) {
355 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
356 return list == NULL ? 0 : list->free_bytes();
357 }
358
359 size_t MetaspaceUtils::free_in_vs_bytes() {
360 return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType);
361 }
362
363 static void inc_stat_nonatomically(size_t* pstat, size_t words) {
364 assert_lock_strong(MetaspaceExpand_lock);
365 (*pstat) += words;
366 }
367
368 static void dec_stat_nonatomically(size_t* pstat, size_t words) {
369 assert_lock_strong(MetaspaceExpand_lock);
370 const size_t size_now = *pstat;
371 assert(size_now >= words, "About to decrement counter below zero "
372 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
373 size_now, words);
374 *pstat = size_now - words;
375 }
376
377 static void inc_stat_atomically(volatile size_t* pstat, size_t words) {
378 Atomic::add(words, pstat);
379 }
380
381 static void dec_stat_atomically(volatile size_t* pstat, size_t words) {
382 const size_t size_now = *pstat;
383 assert(size_now >= words, "About to decrement counter below zero "
384 "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".",
385 size_now, words);
386 Atomic::sub(words, pstat);
387 }
388
389 void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
390 dec_stat_nonatomically(&_capacity_words[mdtype], words);
391 }
392 void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
393 inc_stat_nonatomically(&_capacity_words[mdtype], words);
394 }
395 void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) {
396 dec_stat_atomically(&_used_words[mdtype], words);
397 }
398 void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) {
399 inc_stat_atomically(&_used_words[mdtype], words);
400 }
401 void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) {
402 dec_stat_nonatomically(&_overhead_words[mdtype], words);
403 }
404 void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) {
405 inc_stat_nonatomically(&_overhead_words[mdtype], words);
406 }
407
408 size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) {
409 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
410 return list == NULL ? 0 : list->reserved_bytes();
411 }
412
413 size_t MetaspaceUtils::committed_bytes(Metaspace::MetadataType mdtype) {
414 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
415 return list == NULL ? 0 : list->committed_bytes();
416 }
417
418 size_t MetaspaceUtils::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
419
420 size_t MetaspaceUtils::free_chunks_total_words(Metaspace::MetadataType mdtype) {
421 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
422 if (chunk_manager == NULL) {
423 return 0;
424 }
425 chunk_manager->slow_verify();
426 return chunk_manager->free_chunks_total_words();
427 }
428
429 size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
430 return free_chunks_total_words(mdtype) * BytesPerWord;
431 }
432
433 size_t MetaspaceUtils::free_chunks_total_words() {
434 return free_chunks_total_words(Metaspace::ClassType) +
435 free_chunks_total_words(Metaspace::NonClassType);
436 }
437
438 size_t MetaspaceUtils::free_chunks_total_bytes() {
439 return free_chunks_total_words() * BytesPerWord;
440 }
441
442 bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) {
443 return Metaspace::get_chunk_manager(mdtype) != NULL;
444 }
445
446 MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
447 if (!has_chunk_free_list(mdtype)) {
448 return MetaspaceChunkFreeListSummary();
449 }
450
451 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
452 return cm->chunk_free_list_summary();
453 }
454
455 void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) {
456 log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)",
457 prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K);
458 }
459
460 void MetaspaceUtils::print_on(outputStream* out) {
461 Metaspace::MetadataType nct = Metaspace::NonClassType;
462
463 out->print_cr(" Metaspace "
464 "used " SIZE_FORMAT "K, "
465 "capacity " SIZE_FORMAT "K, "
466 "committed " SIZE_FORMAT "K, "
467 "reserved " SIZE_FORMAT "K",
468 used_bytes()/K,
469 capacity_bytes()/K,
470 committed_bytes()/K,
471 reserved_bytes()/K);
472
473 if (Metaspace::using_class_space()) {
474 Metaspace::MetadataType ct = Metaspace::ClassType;
475 out->print_cr(" class space "
476 "used " SIZE_FORMAT "K, "
477 "capacity " SIZE_FORMAT "K, "
478 "committed " SIZE_FORMAT "K, "
479 "reserved " SIZE_FORMAT "K",
480 used_bytes(ct)/K,
481 capacity_bytes(ct)/K,
482 committed_bytes(ct)/K,
483 reserved_bytes(ct)/K);
484 }
485 }
486
487
488 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
489 const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
490 const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
491 {
492 if (Metaspace::using_class_space()) {
493 out->print(" Non-class space: ");
494 }
495 print_scaled_words(out, reserved_nonclass_words, scale, 7);
496 out->print(" reserved, ");
497 print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
498 out->print_cr(" committed ");
499
500 if (Metaspace::using_class_space()) {
501 const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
502 const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
503 out->print(" Class space: ");
504 print_scaled_words(out, reserved_class_words, scale, 7);
505 out->print(" reserved, ");
506 print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
507 out->print_cr(" committed ");
508
509 const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
510 const size_t committed_words = committed_nonclass_words + committed_class_words;
511 out->print(" Both: ");
512 print_scaled_words(out, reserved_words, scale, 7);
513 out->print(" reserved, ");
514 print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
515 out->print_cr(" committed ");
516 }
517 }
518 }
519
520 // This will print out a basic metaspace usage report but
521 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
522 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
523
524 out->cr();
525 out->print_cr("Usage:");
526
527 if (Metaspace::using_class_space()) {
528 out->print(" Non-class: ");
529 }
530
531 // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
532 // MetaspaceUtils.
533 const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
534 const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
535 const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
536 const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
537
538 print_scaled_words(out, cap_nc, scale, 5);
539 out->print(" capacity, ");
540 print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
541 out->print(" used, ");
542 print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
543 out->print(" free+waste, ");
544 print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
545 out->print(" overhead. ");
546 out->cr();
547
548 if (Metaspace::using_class_space()) {
549 const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
550 const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
551 const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
552 const size_t free_and_waste_c = cap_c - overhead_c - used_c;
553 out->print(" Class: ");
554 print_scaled_words(out, cap_c, scale, 5);
555 out->print(" capacity, ");
556 print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
557 out->print(" used, ");
558 print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
559 out->print(" free+waste, ");
560 print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
561 out->print(" overhead. ");
562 out->cr();
563
564 out->print(" Both: ");
565 const size_t cap = cap_nc + cap_c;
566
567 print_scaled_words(out, cap, scale, 5);
568 out->print(" capacity, ");
569 print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
570 out->print(" used, ");
571 print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
572 out->print(" free+waste, ");
573 print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
574 out->print(" overhead. ");
575 out->cr();
576 }
577
578 out->cr();
579 out->print_cr("Virtual space:");
580
581 print_vs(out, scale);
582
583 out->cr();
584 out->print_cr("Chunk freelists:");
585
586 if (Metaspace::using_class_space()) {
587 out->print(" Non-Class: ");
588 }
589 print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
590 out->cr();
591 if (Metaspace::using_class_space()) {
592 out->print(" Class: ");
593 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale);
594 out->cr();
595 out->print(" Both: ");
596 print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words() +
597 Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale);
598 out->cr();
599 }
600 out->cr();
601
602 }
603
604 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
605
606 const bool print_loaders = (flags & rf_show_loaders) > 0;
607 const bool print_classes = (flags & rf_show_classes) > 0;
608 const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
609 const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
610
611 // Some report options require walking the class loader data graph.
612 PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
613 if (print_loaders) {
614 out->cr();
615 out->print_cr("Usage per loader:");
616 out->cr();
617 }
618
619 ClassLoaderDataGraph::cld_do(&cl); // collect data and optionally print
620
621 // Print totals, broken up by space type.
622 if (print_by_spacetype) {
623 out->cr();
624 out->print_cr("Usage per space type:");
625 out->cr();
626 for (int space_type = (int)Metaspace::ZeroMetaspaceType;
627 space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
628 {
629 uintx num = cl._num_loaders_by_spacetype[space_type];
630 out->print("%s (" UINTX_FORMAT " loader%s)%c",
631 space_type_name((Metaspace::MetaspaceType)space_type),
632 num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.'));
633 if (num > 0) {
634 cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
635 }
636 out->cr();
637 }
638 }
639
640 // Print totals for in-use data:
641 out->cr();
642 out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c",
643 cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.'));
644
645 cl._stats_total.print_on(out, scale, print_by_chunktype);
646
647 // -- Print Virtual space.
648 out->cr();
649 out->print_cr("Virtual space:");
650
651 print_vs(out, scale);
652
653 // -- Print VirtualSpaceList details.
654 if ((flags & rf_show_vslist) > 0) {
655 out->cr();
656 out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
657
658 if (Metaspace::using_class_space()) {
659 out->print_cr(" Non-Class:");
660 }
661 Metaspace::space_list()->print_on(out, scale);
662 if (Metaspace::using_class_space()) {
663 out->print_cr(" Class:");
664 Metaspace::class_space_list()->print_on(out, scale);
665 }
666 }
667 out->cr();
668
669 // -- Print VirtualSpaceList map.
670 if ((flags & rf_show_vsmap) > 0) {
671 out->cr();
672 out->print_cr("Virtual space map:");
673
674 if (Metaspace::using_class_space()) {
675 out->print_cr(" Non-Class:");
676 }
677 Metaspace::space_list()->print_map(out);
678 if (Metaspace::using_class_space()) {
679 out->print_cr(" Class:");
680 Metaspace::class_space_list()->print_map(out);
681 }
682 }
683 out->cr();
684
685 // -- Print Freelists (ChunkManager) details
686 out->cr();
687 out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
688
689 ChunkManagerStatistics non_class_cm_stat;
690 Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
691
692 if (Metaspace::using_class_space()) {
693 out->print_cr(" Non-Class:");
694 }
695 non_class_cm_stat.print_on(out, scale);
696
697 if (Metaspace::using_class_space()) {
698 ChunkManagerStatistics class_cm_stat;
699 Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
700 out->print_cr(" Class:");
701 class_cm_stat.print_on(out, scale);
702 }
703
704 // As a convenience, print a summary of common waste.
705 out->cr();
706 out->print("Waste ");
707 // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
708 const size_t committed_words = committed_bytes() / BytesPerWord;
709
710 out->print("(percentages refer to total committed size ");
711 print_scaled_words(out, committed_words, scale);
712 out->print_cr("):");
713
714 // Print space committed but not yet used by any class loader
715 const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
716 out->print(" Committed unused: ");
717 print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
718 out->cr();
719
720 // Print waste for in-use chunks.
721 UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
722 UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
723 UsedChunksStatistics ucs_all;
724 ucs_all.add(ucs_nonclass);
725 ucs_all.add(ucs_class);
726
727 out->print(" Waste in chunks in use: ");
728 print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
729 out->cr();
730 out->print(" Free in chunks in use: ");
731 print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
732 out->cr();
733 out->print(" Overhead in chunks in use: ");
734 print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
735 out->cr();
736
737 // Print waste in free chunks.
738 const size_t total_capacity_in_free_chunks =
739 Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
740 (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
741 out->print(" In free chunks: ");
742 print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
743 out->cr();
744
745 // Print waste in deallocated blocks.
746 const uintx free_blocks_num =
747 cl._stats_total.nonclass_sm_stats().free_blocks_num() +
748 cl._stats_total.class_sm_stats().free_blocks_num();
749 const size_t free_blocks_cap_words =
750 cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
751 cl._stats_total.class_sm_stats().free_blocks_cap_words();
752 out->print("Deallocated from chunks in use: ");
753 print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
754 out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
755 out->cr();
756
757 // Print total waste.
758 const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
759 + free_blocks_cap_words + unused_words_in_vs;
760 out->print(" -total-: ");
761 print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
762 out->cr();
763
764 // Print internal statistics
765 #ifdef ASSERT
766 out->cr();
767 out->cr();
768 out->print_cr("Internal statistics:");
769 out->cr();
770 out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
771 out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
772 out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
773 out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
774 out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
775 out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
776 out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
777 out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
778 out->cr();
779 #endif
780
781 // Print some interesting settings
782 out->cr();
783 out->cr();
784 out->print("MaxMetaspaceSize: ");
785 print_human_readable_size(out, MaxMetaspaceSize, scale);
786 out->cr();
787 out->print("InitialBootClassLoaderMetaspaceSize: ");
788 print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
789 out->cr();
790
791 out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false");
792 out->cr();
793 if (Metaspace::using_class_space()) {
794 out->print("CompressedClassSpaceSize: ");
795 print_human_readable_size(out, CompressedClassSpaceSize, scale);
796 }
797
798 out->cr();
799 out->cr();
800
801 } // MetaspaceUtils::print_report()
802
803 // Prints an ASCII representation of the given space.
804 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
805 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
806 const bool for_class = mdtype == Metaspace::ClassType ? true : false;
807 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
808 if (vsl != NULL) {
809 if (for_class) {
810 if (!Metaspace::using_class_space()) {
811 out->print_cr("No Class Space.");
812 return;
813 }
814 out->print_raw("---- Metaspace Map (Class Space) ----");
815 } else {
816 out->print_raw("---- Metaspace Map (Non-Class Space) ----");
817 }
818 // Print legend:
819 out->cr();
820 out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
821 out->cr();
822 VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
823 vsl->print_map(out);
824 out->cr();
825 }
826 }
827
828 void MetaspaceUtils::verify_free_chunks() {
829 Metaspace::chunk_manager_metadata()->verify();
830 if (Metaspace::using_class_space()) {
831 Metaspace::chunk_manager_class()->verify();
832 }
833 }
834
835 void MetaspaceUtils::verify_metrics() {
836 #ifdef ASSERT
837 // Please note: there are time windows where the internal counters are out of sync with
838 // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk -
839 // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will
840 // not be counted when iterating the CLDG. So be careful when you call this method.
841 ClassLoaderMetaspaceStatistics total_stat;
842 collect_statistics(&total_stat);
843 UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals();
844 UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals();
845
846 bool mismatch = false;
847 for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) {
848 Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
849 UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
850 if (capacity_words(mdtype) != chunk_stat.cap() ||
851 used_words(mdtype) != chunk_stat.used() ||
852 overhead_words(mdtype) != chunk_stat.overhead()) {
853 mismatch = true;
854 tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
855 tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
856 capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
857 tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
858 chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
859 tty->flush();
860 }
861 }
862 assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
863 #endif
864 }
865
866
867 // Metaspace methods
868
869 size_t Metaspace::_first_chunk_word_size = 0;
870 size_t Metaspace::_first_class_chunk_word_size = 0;
871
872 size_t Metaspace::_commit_alignment = 0;
873 size_t Metaspace::_reserve_alignment = 0;
874
875 VirtualSpaceList* Metaspace::_space_list = NULL;
876 VirtualSpaceList* Metaspace::_class_space_list = NULL;
877
878 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
879 ChunkManager* Metaspace::_chunk_manager_class = NULL;
880
881 #define VIRTUALSPACEMULTIPLIER 2
882
883 #ifdef _LP64
884 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
885
886 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
887 assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
888 // Figure out the narrow_klass_base and the narrow_klass_shift. The
889 // narrow_klass_base is the lower of the metaspace base and the cds base
890 // (if cds is enabled). The narrow_klass_shift depends on the distance
891 // between the lower base and higher address.
892 address lower_base;
893 address higher_address;
894 #if INCLUDE_CDS
895 if (UseSharedSpaces) {
896 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
897 (address)(metaspace_base + compressed_class_space_size()));
898 lower_base = MIN2(metaspace_base, cds_base);
899 } else
900 #endif
901 {
902 higher_address = metaspace_base + compressed_class_space_size();
903 lower_base = metaspace_base;
904
905 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
906 // If compressed class space fits in lower 32G, we don't need a base.
907 if (higher_address <= (address)klass_encoding_max) {
908 lower_base = 0; // Effectively lower base is zero.
909 }
910 }
911
912 Universe::set_narrow_klass_base(lower_base);
913
914 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
915 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
916 // how dump time narrow_klass_shift is set. Although, CDS can work
917 // with zero-shift mode also, to be consistent with AOT it uses
918 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
919 // can be used at same time as AOT code.
920 if (!UseSharedSpaces
921 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
922 Universe::set_narrow_klass_shift(0);
923 } else {
924 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
925 }
926 AOTLoader::set_narrow_klass_shift();
927 }
928
929 #if INCLUDE_CDS
930 // Return TRUE if the specified metaspace_base and cds_base are close enough
931 // to work with compressed klass pointers.
932 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
933 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
934 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
935 address lower_base = MIN2((address)metaspace_base, cds_base);
936 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
937 (address)(metaspace_base + compressed_class_space_size()));
938 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
939 }
940 #endif
941
942 // Try to allocate the metaspace at the requested addr.
943 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
944 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
945 assert(using_class_space(), "called improperly");
946 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
947 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
948 "Metaspace size is too big");
949 assert_is_aligned(requested_addr, _reserve_alignment);
950 assert_is_aligned(cds_base, _reserve_alignment);
951 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
952
953 // Don't use large pages for the class space.
954 bool large_pages = false;
955
956 #if !(defined(AARCH64) || defined(AIX))
957 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
958 _reserve_alignment,
959 large_pages,
960 requested_addr);
961 #else // AARCH64
962 ReservedSpace metaspace_rs;
963
964 // Our compressed klass pointers may fit nicely into the lower 32
965 // bits.
966 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
967 metaspace_rs = ReservedSpace(compressed_class_space_size(),
968 _reserve_alignment,
969 large_pages,
970 requested_addr);
971 }
972
973 if (! metaspace_rs.is_reserved()) {
974 // Aarch64: Try to align metaspace so that we can decode a compressed
975 // klass with a single MOVK instruction. We can do this iff the
976 // compressed class base is a multiple of 4G.
977 // Aix: Search for a place where we can find memory. If we need to load
978 // the base, 4G alignment is helpful, too.
979 size_t increment = AARCH64_ONLY(4*)G;
980 for (char *a = align_up(requested_addr, increment);
981 a < (char*)(1024*G);
982 a += increment) {
983 if (a == (char *)(32*G)) {
984 // Go faster from here on. Zero-based is no longer possible.
985 increment = 4*G;
986 }
987
988 #if INCLUDE_CDS
989 if (UseSharedSpaces
990 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
991 // We failed to find an aligned base that will reach. Fall
992 // back to using our requested addr.
993 metaspace_rs = ReservedSpace(compressed_class_space_size(),
994 _reserve_alignment,
995 large_pages,
996 requested_addr);
997 break;
998 }
999 #endif
1000
1001 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1002 _reserve_alignment,
1003 large_pages,
1004 a);
1005 if (metaspace_rs.is_reserved())
1006 break;
1007 }
1008 }
1009
1010 #endif // AARCH64
1011
1012 if (!metaspace_rs.is_reserved()) {
1013 #if INCLUDE_CDS
1014 if (UseSharedSpaces) {
1015 size_t increment = align_up(1*G, _reserve_alignment);
1016
1017 // Keep trying to allocate the metaspace, increasing the requested_addr
1018 // by 1GB each time, until we reach an address that will no longer allow
1019 // use of CDS with compressed klass pointers.
1020 char *addr = requested_addr;
1021 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1022 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1023 addr = addr + increment;
1024 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1025 _reserve_alignment, large_pages, addr);
1026 }
1027 }
1028 #endif
1029 // If no successful allocation then try to allocate the space anywhere. If
1030 // that fails then OOM doom. At this point we cannot try allocating the
1031 // metaspace as if UseCompressedClassPointers is off because too much
1032 // initialization has happened that depends on UseCompressedClassPointers.
1033 // So, UseCompressedClassPointers cannot be turned off at this point.
1034 if (!metaspace_rs.is_reserved()) {
1035 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1036 _reserve_alignment, large_pages);
1037 if (!metaspace_rs.is_reserved()) {
1038 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1039 compressed_class_space_size()));
1040 }
1041 }
1042 }
1043
1044 // If we got here then the metaspace got allocated.
1045 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1046
1047 #if INCLUDE_CDS
1048 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1049 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1050 FileMapInfo::stop_sharing_and_unmap(
1051 "Could not allocate metaspace at a compatible address");
1052 }
1053 #endif
1054 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1055 UseSharedSpaces ? (address)cds_base : 0);
1056
1057 initialize_class_space(metaspace_rs);
1058
1059 LogTarget(Trace, gc, metaspace) lt;
1060 if (lt.is_enabled()) {
1061 ResourceMark rm;
1062 LogStream ls(lt);
1063 print_compressed_class_space(&ls, requested_addr);
1064 }
1065 }
1066
1067 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1068 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1069 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1070 if (_class_space_list != NULL) {
1071 address base = (address)_class_space_list->current_virtual_space()->bottom();
1072 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1073 compressed_class_space_size(), p2i(base));
1074 if (requested_addr != 0) {
1075 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1076 }
1077 st->cr();
1078 }
1079 }
1080
1081 // For UseCompressedClassPointers the class space is reserved above the top of
1082 // the Java heap. The argument passed in is at the base of the compressed space.
1083 void Metaspace::initialize_class_space(ReservedSpace rs) {
1084 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1085 assert(rs.size() >= CompressedClassSpaceSize,
1086 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1087 assert(using_class_space(), "Must be using class space");
1088 _class_space_list = new VirtualSpaceList(rs);
1089 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1090
1091 if (!_class_space_list->initialization_succeeded()) {
1092 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1093 }
1094 }
1095
1096 #endif
1097
1098 void Metaspace::ergo_initialize() {
1099 if (DumpSharedSpaces) {
1100 // Using large pages when dumping the shared archive is currently not implemented.
1101 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1102 }
1103
1104 size_t page_size = os::vm_page_size();
1105 if (UseLargePages && UseLargePagesInMetaspace) {
1106 page_size = os::large_page_size();
1107 }
1108
1109 _commit_alignment = page_size;
1110 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1111
1112 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1113 // override if MaxMetaspaceSize was set on the command line or not.
1114 // This information is needed later to conform to the specification of the
1115 // java.lang.management.MemoryUsage API.
1116 //
1117 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1118 // globals.hpp to the aligned value, but this is not possible, since the
1119 // alignment depends on other flags being parsed.
1120 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1121
1122 if (MetaspaceSize > MaxMetaspaceSize) {
1123 MetaspaceSize = MaxMetaspaceSize;
1124 }
1125
1126 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1127
1128 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1129
1130 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1131 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1132
1133 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1134
1135 // Initial virtual space size will be calculated at global_initialize()
1136 size_t min_metaspace_sz =
1137 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1138 if (UseCompressedClassPointers) {
1139 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1140 if (min_metaspace_sz >= MaxMetaspaceSize) {
1141 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1142 } else {
1143 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1144 MaxMetaspaceSize - min_metaspace_sz);
1145 }
1146 }
1147 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1148 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1149 min_metaspace_sz);
1150 }
1151
1152 set_compressed_class_space_size(CompressedClassSpaceSize);
1153 }
1154
1155 void Metaspace::global_initialize() {
1156 MetaspaceGC::initialize();
1157
1158 #if INCLUDE_CDS
1159 if (DumpSharedSpaces) {
1160 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1161 } else if (UseSharedSpaces) {
1162 // If any of the archived space fails to map, UseSharedSpaces
1163 // is reset to false. Fall through to the
1164 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1165 // metaspace.
1166 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1167 }
1168
1169 if (!DumpSharedSpaces && !UseSharedSpaces)
1170 #endif // INCLUDE_CDS
1171 {
1172 #ifdef _LP64
1173 if (using_class_space()) {
1174 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1175 allocate_metaspace_compressed_klass_ptrs(base, 0);
1176 }
1177 #endif // _LP64
1178 }
1179
1180 // Initialize these before initializing the VirtualSpaceList
1181 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1182 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1183 // Make the first class chunk bigger than a medium chunk so it's not put
1184 // on the medium chunk list. The next chunk will be small and progress
1185 // from there. This size calculated by -version.
1186 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1187 (CompressedClassSpaceSize/BytesPerWord)*2);
1188 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1189 // Arbitrarily set the initial virtual space to a multiple
1190 // of the boot class loader size.
1191 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1192 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1193
1194 // Initialize the list of virtual spaces.
1195 _space_list = new VirtualSpaceList(word_size);
1196 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1197
1198 if (!_space_list->initialization_succeeded()) {
1199 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1200 }
1201
1202 _tracer = new MetaspaceTracer();
1203 }
1204
1205 void Metaspace::post_initialize() {
1206 MetaspaceGC::post_initialize();
1207 }
1208
1209 void Metaspace::verify_global_initialization() {
1210 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1211 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1212
1213 if (using_class_space()) {
1214 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1215 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1216 }
1217 }
1218
1219 size_t Metaspace::align_word_size_up(size_t word_size) {
1220 size_t byte_size = word_size * wordSize;
1221 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1222 }
1223
1224 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1225 MetaspaceObj::Type type, TRAPS) {
1226 assert(!_frozen, "sanity");
1227 if (HAS_PENDING_EXCEPTION) {
1228 assert(false, "Should not allocate with exception pending");
1229 return NULL; // caller does a CHECK_NULL too
1230 }
1231
1232 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1233 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1234
1235 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1236
1237 // Try to allocate metadata.
1238 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1239
1240 if (result == NULL) {
1241 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1242
1243 // Allocation failed.
1244 if (is_init_completed() && !(DumpSharedSpaces && THREAD->is_VM_thread())) {
1245 // Only start a GC if the bootstrapping has completed.
1246 // Also, we cannot GC if we are at the end of the CDS dumping stage which runs inside
1247 // the VM thread.
1248
1249 // Try to clean out some memory and retry.
1250 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1251 }
1252 }
1253
1254 if (result == NULL) {
1255 if (DumpSharedSpaces) {
1256 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1257 // We should abort to avoid generating a potentially bad archive.
1258 tty->print_cr("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1259 MetaspaceObj::type_name(type), word_size * BytesPerWord);
1260 tty->print_cr("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize);
1261 vm_exit(1);
1262 }
1263 report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL);
1264 }
1265
1266 // Zero initialize.
1267 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1268
1269 return result;
1270 }
1271
1272 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1273 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1274
1275 // If result is still null, we are out of memory.
1276 Log(gc, metaspace, freelist, oom) log;
1277 if (log.is_info()) {
1278 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1279 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1280 ResourceMark rm;
1281 if (log.is_debug()) {
1282 if (loader_data->metaspace_or_null() != NULL) {
1283 LogStream ls(log.debug());
1284 loader_data->print_value_on(&ls);
1285 }
1286 }
1287 LogStream ls(log.info());
1288 // In case of an OOM, log out a short but still useful report.
1289 MetaspaceUtils::print_basic_report(&ls, 0);
1290 }
1291
1292 bool out_of_compressed_class_space = false;
1293 if (is_class_space_allocation(mdtype)) {
1294 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1295 out_of_compressed_class_space =
1296 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1297 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1298 CompressedClassSpaceSize;
1299 }
1300
1301 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1302 const char* space_string = out_of_compressed_class_space ?
1303 "Compressed class space" : "Metaspace";
1304
1305 report_java_out_of_memory(space_string);
1306
1307 if (JvmtiExport::should_post_resource_exhausted()) {
1308 JvmtiExport::post_resource_exhausted(
1309 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1310 space_string);
1311 }
1312
1313 if (!is_init_completed()) {
1314 vm_exit_during_initialization("OutOfMemoryError", space_string);
1315 }
1316
1317 if (out_of_compressed_class_space) {
1318 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1319 } else {
1320 THROW_OOP(Universe::out_of_memory_error_metaspace());
1321 }
1322 }
1323
1324 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1325 switch (mdtype) {
1326 case Metaspace::ClassType: return "Class";
1327 case Metaspace::NonClassType: return "Metadata";
1328 default:
1329 assert(false, "Got bad mdtype: %d", (int) mdtype);
1330 return NULL;
1331 }
1332 }
1333
1334 void Metaspace::purge(MetadataType mdtype) {
1335 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1336 }
1337
1338 void Metaspace::purge() {
1339 MutexLockerEx cl(MetaspaceExpand_lock,
1340 Mutex::_no_safepoint_check_flag);
1341 purge(NonClassType);
1342 if (using_class_space()) {
1343 purge(ClassType);
1344 }
1345 }
1346
1347 bool Metaspace::contains(const void* ptr) {
1348 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1349 return true;
1350 }
1351 return contains_non_shared(ptr);
1352 }
1353
1354 bool Metaspace::contains_non_shared(const void* ptr) {
1355 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1356 return true;
1357 }
1358
1359 return get_space_list(NonClassType)->contains(ptr);
1360 }
1361
1362 // ClassLoaderMetaspace
1363
1364 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1365 : _lock(lock)
1366 , _space_type(type)
1367 , _vsm(NULL)
1368 , _class_vsm(NULL)
1369 {
1370 initialize(lock, type);
1371 }
1372
1373 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1374 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1375 delete _vsm;
1376 if (Metaspace::using_class_space()) {
1377 delete _class_vsm;
1378 }
1379 }
1380
1381 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1382 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1383 if (chunk != NULL) {
1384 // Add to this manager's list of chunks in use and make it the current_chunk().
1385 get_space_manager(mdtype)->add_chunk(chunk, true);
1386 }
1387 }
1388
1389 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1390 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1391
1392 // Get a chunk from the chunk freelist
1393 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1394
1395 if (chunk == NULL) {
1396 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1397 get_space_manager(mdtype)->medium_chunk_bunch());
1398 }
1399
1400 return chunk;
1401 }
1402
1403 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1404 Metaspace::verify_global_initialization();
1405
1406 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1407
1408 // Allocate SpaceManager for metadata objects.
1409 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1410
1411 if (Metaspace::using_class_space()) {
1412 // Allocate SpaceManager for classes.
1413 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1414 }
1415
1416 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1417
1418 // Allocate chunk for metadata objects
1419 initialize_first_chunk(type, Metaspace::NonClassType);
1420
1421 // Allocate chunk for class metadata objects
1422 if (Metaspace::using_class_space()) {
1423 initialize_first_chunk(type, Metaspace::ClassType);
1424 }
1425 }
1426
1427 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1428 Metaspace::assert_not_frozen();
1429
1430 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1431
1432 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1433 if (Metaspace::is_class_space_allocation(mdtype)) {
1434 return class_vsm()->allocate(word_size);
1435 } else {
1436 return vsm()->allocate(word_size);
1437 }
1438 }
1439
1440 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1441 Metaspace::assert_not_frozen();
1442 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1443 assert(delta_bytes > 0, "Must be");
1444
1445 size_t before = 0;
1446 size_t after = 0;
1447 MetaWord* res;
1448 bool incremented;
1449
1450 // Each thread increments the HWM at most once. Even if the thread fails to increment
1451 // the HWM, an allocation is still attempted. This is because another thread must then
1452 // have incremented the HWM and therefore the allocation might still succeed.
1453 do {
1454 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
1455 res = allocate(word_size, mdtype);
1456 } while (!incremented && res == NULL);
1457
1458 if (incremented) {
1459 Metaspace::tracer()->report_gc_threshold(before, after,
1460 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1461 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1462 }
1463
1464 return res;
1465 }
1466
1467 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1468 return (vsm()->used_words() +
1469 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1470 }
1471
1472 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1473 return (vsm()->capacity_words() +
1474 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1475 }
1476
1477 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1478 Metaspace::assert_not_frozen();
1479 assert(!SafepointSynchronize::is_at_safepoint()
1480 || Thread::current()->is_VM_thread(), "should be the VM thread");
1481
1482 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1483
1484 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1485
1486 if (is_class && Metaspace::using_class_space()) {
1487 class_vsm()->deallocate(ptr, word_size);
1488 } else {
1489 vsm()->deallocate(ptr, word_size);
1490 }
1491 }
1492
1493 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1494 assert(Metaspace::using_class_space(), "Has to use class space");
1495 return class_vsm()->calc_chunk_size(word_size);
1496 }
1497
1498 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1499 // Print both class virtual space counts and metaspace.
1500 if (Verbose) {
1501 vsm()->print_on(out);
1502 if (Metaspace::using_class_space()) {
1503 class_vsm()->print_on(out);
1504 }
1505 }
1506 }
1507
1508 void ClassLoaderMetaspace::verify() {
1509 vsm()->verify();
1510 if (Metaspace::using_class_space()) {
1511 class_vsm()->verify();
1512 }
1513 }
1514
1515 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1516 assert_lock_strong(lock());
1517 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1518 if (Metaspace::using_class_space()) {
1519 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1520 }
1521 }
1522
1523 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1524 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1525 add_to_statistics_locked(out);
1526 }
1527
1528 /////////////// Unit tests ///////////////
1529
1530 #ifndef PRODUCT
1531
1532 class TestMetaspaceUtilsTest : AllStatic {
1533 public:
1534 static void test_reserved() {
1535 size_t reserved = MetaspaceUtils::reserved_bytes();
1536
1537 assert(reserved > 0, "assert");
1538
1539 size_t committed = MetaspaceUtils::committed_bytes();
1540 assert(committed <= reserved, "assert");
1541
1542 size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType);
1543 assert(reserved_metadata > 0, "assert");
1544 assert(reserved_metadata <= reserved, "assert");
1545
1546 if (UseCompressedClassPointers) {
1547 size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType);
1548 assert(reserved_class > 0, "assert");
1549 assert(reserved_class < reserved, "assert");
1550 }
1551 }
1552
1553 static void test_committed() {
1554 size_t committed = MetaspaceUtils::committed_bytes();
1555
1556 assert(committed > 0, "assert");
1557
1558 size_t reserved = MetaspaceUtils::reserved_bytes();
1559 assert(committed <= reserved, "assert");
1560
1561 size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType);
1562 assert(committed_metadata > 0, "assert");
1563 assert(committed_metadata <= committed, "assert");
1564
1565 if (UseCompressedClassPointers) {
1566 size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
1567 assert(committed_class > 0, "assert");
1568 assert(committed_class < committed, "assert");
1569 }
1570 }
1571
1572 static void test_virtual_space_list_large_chunk() {
1573 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
1574 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1575 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
1576 // vm_allocation_granularity aligned on Windows.
1577 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
1578 large_size += (os::vm_page_size()/BytesPerWord);
1579 vs_list->get_new_chunk(large_size, 0);
1580 }
1581
1582 static void test() {
1583 test_reserved();
1584 test_committed();
1585 test_virtual_space_list_large_chunk();
1586 }
1587 };
1588
1589 void TestMetaspaceUtils_test() {
1590 TestMetaspaceUtilsTest::test();
1591 }
1592
1593 class TestVirtualSpaceNodeTest {
1594 static void chunk_up(size_t words_left, size_t& num_medium_chunks,
1595 size_t& num_small_chunks,
1596 size_t& num_specialized_chunks) {
1597 num_medium_chunks = words_left / MediumChunk;
1598 words_left = words_left % MediumChunk;
1599
1600 num_small_chunks = words_left / SmallChunk;
1601 words_left = words_left % SmallChunk;
1602 // how many specialized chunks can we get?
1603 num_specialized_chunks = words_left / SpecializedChunk;
1604 assert(words_left % SpecializedChunk == 0, "should be nothing left");
1605 }
1606
1607 public:
1608 static void test() {
1609 MutexLockerEx ml(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1610 const size_t vsn_test_size_words = MediumChunk * 4;
1611 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
1612
1613 // The chunk sizes must be multiples of eachother, or this will fail
1614 STATIC_ASSERT(MediumChunk % SmallChunk == 0);
1615 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
1616
1617 { // No committed memory in VSN
1618 ChunkManager cm(false);
1619 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1620 vsn.initialize();
1621 vsn.retire(&cm);
1622 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
1623 }
1624
1625 { // All of VSN is committed, half is used by chunks
1626 ChunkManager cm(false);
1627 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1628 vsn.initialize();
1629 vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
1630 vsn.get_chunk_vs(MediumChunk);
1631 vsn.get_chunk_vs(MediumChunk);
1632 vsn.retire(&cm);
1633 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
1634 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
1635 }
1636
1637 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
1638 // This doesn't work for systems with vm_page_size >= 16K.
1639 if (page_chunks < MediumChunk) {
1640 // 4 pages of VSN is committed, some is used by chunks
1641 ChunkManager cm(false);
1642 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1643
1644 vsn.initialize();
1645 vsn.expand_by(page_chunks, page_chunks);
1646 vsn.get_chunk_vs(SmallChunk);
1647 vsn.get_chunk_vs(SpecializedChunk);
1648 vsn.retire(&cm);
1649
1650 // committed - used = words left to retire
1651 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
1652
1653 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1654 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1655
1656 assert(num_medium_chunks == 0, "should not get any medium chunks");
1657 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1658 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1659 }
1660
1661 { // Half of VSN is committed, a humongous chunk is used
1662 ChunkManager cm(false);
1663 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1664 vsn.initialize();
1665 vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
1666 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
1667 vsn.retire(&cm);
1668
1669 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
1670 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1671 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1672
1673 assert(num_medium_chunks == 0, "should not get any medium chunks");
1674 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1675 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1676 }
1677
1678 }
1679
1680 #define assert_is_available_positive(word_size) \
1681 assert(vsn.is_available(word_size), \
1682 #word_size ": " PTR_FORMAT " bytes were not available in " \
1683 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1684 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1685
1686 #define assert_is_available_negative(word_size) \
1687 assert(!vsn.is_available(word_size), \
1688 #word_size ": " PTR_FORMAT " bytes should not be available in " \
1689 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1690 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1691
1692 static void test_is_available_positive() {
1693 // Reserve some memory.
1694 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1695 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1696
1697 // Commit some memory.
1698 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1699 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1700 assert(expanded, "Failed to commit");
1701
1702 // Check that is_available accepts the committed size.
1703 assert_is_available_positive(commit_word_size);
1704
1705 // Check that is_available accepts half the committed size.
1706 size_t expand_word_size = commit_word_size / 2;
1707 assert_is_available_positive(expand_word_size);
1708 }
1709
1710 static void test_is_available_negative() {
1711 // Reserve some memory.
1712 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1713 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1714
1715 // Commit some memory.
1716 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1717 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1718 assert(expanded, "Failed to commit");
1719
1720 // Check that is_available doesn't accept a too large size.
1721 size_t two_times_commit_word_size = commit_word_size * 2;
1722 assert_is_available_negative(two_times_commit_word_size);
1723 }
1724
1725 static void test_is_available_overflow() {
1726 // Reserve some memory.
1727 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1728 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1729
1730 // Commit some memory.
1731 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1732 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1733 assert(expanded, "Failed to commit");
1734
1735 // Calculate a size that will overflow the virtual space size.
1736 void* virtual_space_max = (void*)(uintptr_t)-1;
1737 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
1738 size_t overflow_size = bottom_to_max + BytesPerWord;
1739 size_t overflow_word_size = overflow_size / BytesPerWord;
1740
1741 // Check that is_available can handle the overflow.
1742 assert_is_available_negative(overflow_word_size);
1743 }
1744
1745 static void test_is_available() {
1746 TestVirtualSpaceNodeTest::test_is_available_positive();
1747 TestVirtualSpaceNodeTest::test_is_available_negative();
1748 TestVirtualSpaceNodeTest::test_is_available_overflow();
1749 }
1750 };
1751
1752 #endif // !PRODUCT
1753
1754 struct chunkmanager_statistics_t {
1755 int num_specialized_chunks;
1756 int num_small_chunks;
1757 int num_medium_chunks;
1758 int num_humongous_chunks;
1759 };
1760
1761 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1762 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1763 ChunkManagerStatistics stat;
1764 chunk_manager->collect_statistics(&stat);
1765 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1766 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1767 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1768 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1769 }
1770
1771 struct chunk_geometry_t {
1772 size_t specialized_chunk_word_size;
1773 size_t small_chunk_word_size;
1774 size_t medium_chunk_word_size;
1775 };
1776
1777 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1778 if (mdType == Metaspace::NonClassType) {
1779 out->specialized_chunk_word_size = SpecializedChunk;
1780 out->small_chunk_word_size = SmallChunk;
1781 out->medium_chunk_word_size = MediumChunk;
1782 } else {
1783 out->specialized_chunk_word_size = ClassSpecializedChunk;
1784 out->small_chunk_word_size = ClassSmallChunk;
1785 out->medium_chunk_word_size = ClassMediumChunk;
1786 }
1787 }