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 #include "aot/aotLoader.hpp"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "gc/shared/collectedHeap.hpp"
29 #include "logging/log.hpp"
30 #include "logging/logStream.hpp"
31 #include "memory/filemap.hpp"
32 #include "memory/metaspace.hpp"
33 #include "memory/metaspace/chunkManager.hpp"
34 #include "memory/metaspace/metachunk.hpp"
35 #include "memory/metaspace/metaspaceCommon.hpp"
36 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
37 #include "memory/metaspace/spaceManager.hpp"
38 #include "memory/metaspace/virtualSpaceList.hpp"
39 #include "memory/metaspaceShared.hpp"
40 #include "memory/metaspaceTracer.hpp"
41 #include "memory/universe.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/orderAccess.hpp"
44 #include "services/memTracker.hpp"
45 #include "utilities/copy.hpp"
46 #include "utilities/debug.hpp"
47 #include "utilities/formatBuffer.hpp"
48 #include "utilities/globalDefinitions.hpp"
49
50
51 using namespace metaspace;
52
53 MetaWord* last_allocated = 0;
54
55 size_t Metaspace::_compressed_class_space_size;
56 const MetaspaceTracer* Metaspace::_tracer = NULL;
57
58 DEBUG_ONLY(bool Metaspace::_frozen = false;)
59
60 static const char* space_type_name(Metaspace::MetaspaceType t) {
61 const char* s = NULL;
62 switch (t) {
63 case Metaspace::StandardMetaspaceType: s = "Standard"; break;
64 case Metaspace::BootMetaspaceType: s = "Boot"; break;
65 case Metaspace::UnsafeAnonymousMetaspaceType: s = "UnsafeAnonymous"; break;
66 case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
67 default: ShouldNotReachHere();
68 }
69 return s;
70 }
71
72 volatile size_t MetaspaceGC::_capacity_until_GC = 0;
73 uint MetaspaceGC::_shrink_factor = 0;
74 bool MetaspaceGC::_should_concurrent_collect = false;
75
76 // BlockFreelist methods
77
78 // VirtualSpaceNode methods
79
80 // MetaspaceGC methods
81
82 // VM_CollectForMetadataAllocation is the vm operation used to GC.
83 // Within the VM operation after the GC the attempt to allocate the metadata
84 // should succeed. If the GC did not free enough space for the metaspace
85 // allocation, the HWM is increased so that another virtualspace will be
86 // allocated for the metadata. With perm gen the increase in the perm
87 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
88 // metaspace policy uses those as the small and large steps for the HWM.
89 //
90 // After the GC the compute_new_size() for MetaspaceGC is called to
91 // resize the capacity of the metaspaces. The current implementation
92 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
93 // to resize the Java heap by some GC's. New flags can be implemented
94 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
95 // free space is desirable in the metaspace capacity to decide how much
96 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
97 // free space is desirable in the metaspace capacity before decreasing
98 // the HWM.
99
100 // Calculate the amount to increase the high water mark (HWM).
101 // Increase by a minimum amount (MinMetaspaceExpansion) so that
102 // another expansion is not requested too soon. If that is not
103 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
104 // If that is still not enough, expand by the size of the allocation
105 // plus some.
106 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
107 size_t min_delta = MinMetaspaceExpansion;
108 size_t max_delta = MaxMetaspaceExpansion;
109 size_t delta = align_up(bytes, Metaspace::commit_alignment());
110
111 if (delta <= min_delta) {
112 delta = min_delta;
113 } else if (delta <= max_delta) {
114 // Don't want to hit the high water mark on the next
115 // allocation so make the delta greater than just enough
116 // for this allocation.
117 delta = max_delta;
118 } else {
119 // This allocation is large but the next ones are probably not
120 // so increase by the minimum.
121 delta = delta + min_delta;
122 }
123
124 assert_is_aligned(delta, Metaspace::commit_alignment());
125
126 return delta;
127 }
128
129 size_t MetaspaceGC::capacity_until_GC() {
130 size_t value = OrderAccess::load_acquire(&_capacity_until_GC);
131 assert(value >= MetaspaceSize, "Not initialized properly?");
132 return value;
133 }
134
135 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
136 assert_is_aligned(v, Metaspace::commit_alignment());
137
138 size_t old_capacity_until_GC = _capacity_until_GC;
139 size_t new_value = old_capacity_until_GC + v;
140
141 if (new_value < old_capacity_until_GC) {
142 // The addition wrapped around, set new_value to aligned max value.
143 new_value = align_down(max_uintx, Metaspace::commit_alignment());
144 }
145
146 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 // Utils to check if a pointer or range is part of a committed metaspace region.
867 metaspace::VirtualSpaceNode* MetaspaceUtils::find_enclosing_virtual_space(const void* p) {
868 VirtualSpaceNode* vsn = Metaspace::space_list()->find_enclosing_space(p);
869 if (Metaspace::using_class_space() && vsn == NULL) {
870 vsn = Metaspace::class_space_list()->find_enclosing_space(p);
871 }
872 return vsn;
873 }
874
875 bool MetaspaceUtils::is_in_committed(const void* p) {
876 #if INCLUDE_CDS
877 if (UseSharedSpaces) {
878 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
879 if (FileMapInfo::current_info()->is_in_shared_region(p, idx)) {
880 return true;
881 }
882 }
883 }
884 #endif
885 return find_enclosing_virtual_space(p) != NULL;
886 }
887
888 bool MetaspaceUtils::is_range_in_committed(const void* from, const void* to) {
889 #if INCLUDE_CDS
890 if (UseSharedSpaces) {
891 for (int idx = MetaspaceShared::ro; idx <= MetaspaceShared::mc; idx++) {
892 if (FileMapInfo::current_info()->is_in_shared_region(from, idx)) {
893 return FileMapInfo::current_info()->is_in_shared_region(to, idx);
894 }
895 }
896 }
897 #endif
898 VirtualSpaceNode* vsn = find_enclosing_virtual_space(from);
899 return (vsn != NULL) && vsn->contains(to);
900 }
901
902
903 // Metaspace methods
904
905 size_t Metaspace::_first_chunk_word_size = 0;
906 size_t Metaspace::_first_class_chunk_word_size = 0;
907
908 size_t Metaspace::_commit_alignment = 0;
909 size_t Metaspace::_reserve_alignment = 0;
910
911 VirtualSpaceList* Metaspace::_space_list = NULL;
912 VirtualSpaceList* Metaspace::_class_space_list = NULL;
913
914 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
915 ChunkManager* Metaspace::_chunk_manager_class = NULL;
916
917 #define VIRTUALSPACEMULTIPLIER 2
918
919 #ifdef _LP64
920 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
921
922 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
923 assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
924 // Figure out the narrow_klass_base and the narrow_klass_shift. The
925 // narrow_klass_base is the lower of the metaspace base and the cds base
926 // (if cds is enabled). The narrow_klass_shift depends on the distance
927 // between the lower base and higher address.
928 address lower_base;
929 address higher_address;
930 #if INCLUDE_CDS
931 if (UseSharedSpaces) {
932 higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
933 (address)(metaspace_base + compressed_class_space_size()));
934 lower_base = MIN2(metaspace_base, cds_base);
935 } else
936 #endif
937 {
938 higher_address = metaspace_base + compressed_class_space_size();
939 lower_base = metaspace_base;
940
941 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
942 // If compressed class space fits in lower 32G, we don't need a base.
943 if (higher_address <= (address)klass_encoding_max) {
944 lower_base = 0; // Effectively lower base is zero.
945 }
946 }
947
948 Universe::set_narrow_klass_base(lower_base);
949
950 // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
951 // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for
952 // how dump time narrow_klass_shift is set. Although, CDS can work
953 // with zero-shift mode also, to be consistent with AOT it uses
954 // LogKlassAlignmentInBytes for klass shift so archived java heap objects
955 // can be used at same time as AOT code.
956 if (!UseSharedSpaces
957 && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
958 Universe::set_narrow_klass_shift(0);
959 } else {
960 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
961 }
962 AOTLoader::set_narrow_klass_shift();
963 }
964
965 #if INCLUDE_CDS
966 // Return TRUE if the specified metaspace_base and cds_base are close enough
967 // to work with compressed klass pointers.
968 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
969 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
970 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
971 address lower_base = MIN2((address)metaspace_base, cds_base);
972 address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()),
973 (address)(metaspace_base + compressed_class_space_size()));
974 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
975 }
976 #endif
977
978 // Try to allocate the metaspace at the requested addr.
979 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
980 assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class.");
981 assert(using_class_space(), "called improperly");
982 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
983 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
984 "Metaspace size is too big");
985 assert_is_aligned(requested_addr, _reserve_alignment);
986 assert_is_aligned(cds_base, _reserve_alignment);
987 assert_is_aligned(compressed_class_space_size(), _reserve_alignment);
988
989 // Don't use large pages for the class space.
990 bool large_pages = false;
991
992 #if !(defined(AARCH64) || defined(AIX))
993 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
994 _reserve_alignment,
995 large_pages,
996 requested_addr);
997 #else // AARCH64
998 ReservedSpace metaspace_rs;
999
1000 // Our compressed klass pointers may fit nicely into the lower 32
1001 // bits.
1002 if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
1003 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1004 _reserve_alignment,
1005 large_pages,
1006 requested_addr);
1007 }
1008
1009 if (! metaspace_rs.is_reserved()) {
1010 // Aarch64: Try to align metaspace so that we can decode a compressed
1011 // klass with a single MOVK instruction. We can do this iff the
1012 // compressed class base is a multiple of 4G.
1013 // Aix: Search for a place where we can find memory. If we need to load
1014 // the base, 4G alignment is helpful, too.
1015 size_t increment = AARCH64_ONLY(4*)G;
1016 for (char *a = align_up(requested_addr, increment);
1017 a < (char*)(1024*G);
1018 a += increment) {
1019 if (a == (char *)(32*G)) {
1020 // Go faster from here on. Zero-based is no longer possible.
1021 increment = 4*G;
1022 }
1023
1024 #if INCLUDE_CDS
1025 if (UseSharedSpaces
1026 && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
1027 // We failed to find an aligned base that will reach. Fall
1028 // back to using our requested addr.
1029 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1030 _reserve_alignment,
1031 large_pages,
1032 requested_addr);
1033 break;
1034 }
1035 #endif
1036
1037 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1038 _reserve_alignment,
1039 large_pages,
1040 a);
1041 if (metaspace_rs.is_reserved())
1042 break;
1043 }
1044 }
1045
1046 #endif // AARCH64
1047
1048 if (!metaspace_rs.is_reserved()) {
1049 #if INCLUDE_CDS
1050 if (UseSharedSpaces) {
1051 size_t increment = align_up(1*G, _reserve_alignment);
1052
1053 // Keep trying to allocate the metaspace, increasing the requested_addr
1054 // by 1GB each time, until we reach an address that will no longer allow
1055 // use of CDS with compressed klass pointers.
1056 char *addr = requested_addr;
1057 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
1058 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
1059 addr = addr + increment;
1060 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1061 _reserve_alignment, large_pages, addr);
1062 }
1063 }
1064 #endif
1065 // If no successful allocation then try to allocate the space anywhere. If
1066 // that fails then OOM doom. At this point we cannot try allocating the
1067 // metaspace as if UseCompressedClassPointers is off because too much
1068 // initialization has happened that depends on UseCompressedClassPointers.
1069 // So, UseCompressedClassPointers cannot be turned off at this point.
1070 if (!metaspace_rs.is_reserved()) {
1071 metaspace_rs = ReservedSpace(compressed_class_space_size(),
1072 _reserve_alignment, large_pages);
1073 if (!metaspace_rs.is_reserved()) {
1074 vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
1075 compressed_class_space_size()));
1076 }
1077 }
1078 }
1079
1080 // If we got here then the metaspace got allocated.
1081 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
1082
1083 #if INCLUDE_CDS
1084 // Verify that we can use shared spaces. Otherwise, turn off CDS.
1085 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
1086 FileMapInfo::stop_sharing_and_unmap(
1087 "Could not allocate metaspace at a compatible address");
1088 }
1089 #endif
1090 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
1091 UseSharedSpaces ? (address)cds_base : 0);
1092
1093 initialize_class_space(metaspace_rs);
1094
1095 LogTarget(Trace, gc, metaspace) lt;
1096 if (lt.is_enabled()) {
1097 ResourceMark rm;
1098 LogStream ls(lt);
1099 print_compressed_class_space(&ls, requested_addr);
1100 }
1101 }
1102
1103 void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
1104 st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1105 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
1106 if (_class_space_list != NULL) {
1107 address base = (address)_class_space_list->current_virtual_space()->bottom();
1108 st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1109 compressed_class_space_size(), p2i(base));
1110 if (requested_addr != 0) {
1111 st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1112 }
1113 st->cr();
1114 }
1115 }
1116
1117 // For UseCompressedClassPointers the class space is reserved above the top of
1118 // the Java heap. The argument passed in is at the base of the compressed space.
1119 void Metaspace::initialize_class_space(ReservedSpace rs) {
1120 // The reserved space size may be bigger because of alignment, esp with UseLargePages
1121 assert(rs.size() >= CompressedClassSpaceSize,
1122 SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1123 assert(using_class_space(), "Must be using class space");
1124 _class_space_list = new VirtualSpaceList(rs);
1125 _chunk_manager_class = new ChunkManager(true/*is_class*/);
1126
1127 if (!_class_space_list->initialization_succeeded()) {
1128 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1129 }
1130 }
1131
1132 #endif
1133
1134 void Metaspace::ergo_initialize() {
1135 if (DumpSharedSpaces) {
1136 // Using large pages when dumping the shared archive is currently not implemented.
1137 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
1138 }
1139
1140 size_t page_size = os::vm_page_size();
1141 if (UseLargePages && UseLargePagesInMetaspace) {
1142 page_size = os::large_page_size();
1143 }
1144
1145 _commit_alignment = page_size;
1146 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
1147
1148 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1149 // override if MaxMetaspaceSize was set on the command line or not.
1150 // This information is needed later to conform to the specification of the
1151 // java.lang.management.MemoryUsage API.
1152 //
1153 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1154 // globals.hpp to the aligned value, but this is not possible, since the
1155 // alignment depends on other flags being parsed.
1156 MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1157
1158 if (MetaspaceSize > MaxMetaspaceSize) {
1159 MetaspaceSize = MaxMetaspaceSize;
1160 }
1161
1162 MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1163
1164 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1165
1166 MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);
1167 MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
1168
1169 CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
1170
1171 // Initial virtual space size will be calculated at global_initialize()
1172 size_t min_metaspace_sz =
1173 VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1174 if (UseCompressedClassPointers) {
1175 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
1176 if (min_metaspace_sz >= MaxMetaspaceSize) {
1177 vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1178 } else {
1179 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize,
1180 MaxMetaspaceSize - min_metaspace_sz);
1181 }
1182 }
1183 } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1184 FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize,
1185 min_metaspace_sz);
1186 }
1187
1188 set_compressed_class_space_size(CompressedClassSpaceSize);
1189 }
1190
1191 void Metaspace::global_initialize() {
1192 MetaspaceGC::initialize();
1193
1194 #if INCLUDE_CDS
1195 if (DumpSharedSpaces) {
1196 MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1197 } else if (UseSharedSpaces) {
1198 // If any of the archived space fails to map, UseSharedSpaces
1199 // is reset to false. Fall through to the
1200 // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1201 // metaspace.
1202 MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1203 }
1204
1205 if (!DumpSharedSpaces && !UseSharedSpaces)
1206 #endif // INCLUDE_CDS
1207 {
1208 #ifdef _LP64
1209 if (using_class_space()) {
1210 char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1211 allocate_metaspace_compressed_klass_ptrs(base, 0);
1212 }
1213 #endif // _LP64
1214 }
1215
1216 // Initialize these before initializing the VirtualSpaceList
1217 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1218 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1219 // Make the first class chunk bigger than a medium chunk so it's not put
1220 // on the medium chunk list. The next chunk will be small and progress
1221 // from there. This size calculated by -version.
1222 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1223 (CompressedClassSpaceSize/BytesPerWord)*2);
1224 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1225 // Arbitrarily set the initial virtual space to a multiple
1226 // of the boot class loader size.
1227 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1228 word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1229
1230 // Initialize the list of virtual spaces.
1231 _space_list = new VirtualSpaceList(word_size);
1232 _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1233
1234 if (!_space_list->initialization_succeeded()) {
1235 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1236 }
1237
1238 _tracer = new MetaspaceTracer();
1239 }
1240
1241 void Metaspace::post_initialize() {
1242 MetaspaceGC::post_initialize();
1243 }
1244
1245 void Metaspace::verify_global_initialization() {
1246 assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1247 assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1248
1249 if (using_class_space()) {
1250 assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1251 assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1252 }
1253 }
1254
1255 size_t Metaspace::align_word_size_up(size_t word_size) {
1256 size_t byte_size = word_size * wordSize;
1257 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1258 }
1259
1260 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1261 MetaspaceObj::Type type, TRAPS) {
1262 assert(!_frozen, "sanity");
1263 if (HAS_PENDING_EXCEPTION) {
1264 assert(false, "Should not allocate with exception pending");
1265 return NULL; // caller does a CHECK_NULL too
1266 }
1267
1268 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1269 "ClassLoaderData::the_null_class_loader_data() should have been used.");
1270
1271 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1272
1273 // Try to allocate metadata.
1274 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1275
1276 if (result == NULL) {
1277 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
1278
1279 // Allocation failed.
1280 if (is_init_completed() && !(DumpSharedSpaces && THREAD->is_VM_thread())) {
1281 // Only start a GC if the bootstrapping has completed.
1282 // Also, we cannot GC if we are at the end of the CDS dumping stage which runs inside
1283 // the VM thread.
1284
1285 // Try to clean out some memory and retry.
1286 result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
1287 }
1288 }
1289
1290 if (result == NULL) {
1291 if (DumpSharedSpaces) {
1292 // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM.
1293 // We should abort to avoid generating a potentially bad archive.
1294 vm_exit_during_cds_dumping(err_msg("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.",
1295 MetaspaceObj::type_name(type), word_size * BytesPerWord),
1296 err_msg("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize));
1297 }
1298 report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
1299 assert(HAS_PENDING_EXCEPTION, "sanity");
1300 return NULL;
1301 }
1302
1303 // Zero initialize.
1304 Copy::fill_to_words((HeapWord*)result, word_size, 0);
1305
1306 return result;
1307 }
1308
1309 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
1310 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
1311
1312 // If result is still null, we are out of memory.
1313 Log(gc, metaspace, freelist, oom) log;
1314 if (log.is_info()) {
1315 log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
1316 is_class_space_allocation(mdtype) ? "class" : "data", word_size);
1317 ResourceMark rm;
1318 if (log.is_debug()) {
1319 if (loader_data->metaspace_or_null() != NULL) {
1320 LogStream ls(log.debug());
1321 loader_data->print_value_on(&ls);
1322 }
1323 }
1324 LogStream ls(log.info());
1325 // In case of an OOM, log out a short but still useful report.
1326 MetaspaceUtils::print_basic_report(&ls, 0);
1327 }
1328
1329 bool out_of_compressed_class_space = false;
1330 if (is_class_space_allocation(mdtype)) {
1331 ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
1332 out_of_compressed_class_space =
1333 MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
1334 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
1335 CompressedClassSpaceSize;
1336 }
1337
1338 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
1339 const char* space_string = out_of_compressed_class_space ?
1340 "Compressed class space" : "Metaspace";
1341
1342 report_java_out_of_memory(space_string);
1343
1344 if (JvmtiExport::should_post_resource_exhausted()) {
1345 JvmtiExport::post_resource_exhausted(
1346 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
1347 space_string);
1348 }
1349
1350 if (!is_init_completed()) {
1351 vm_exit_during_initialization("OutOfMemoryError", space_string);
1352 }
1353
1354 if (out_of_compressed_class_space) {
1355 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
1356 } else {
1357 THROW_OOP(Universe::out_of_memory_error_metaspace());
1358 }
1359 }
1360
1361 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
1362 switch (mdtype) {
1363 case Metaspace::ClassType: return "Class";
1364 case Metaspace::NonClassType: return "Metadata";
1365 default:
1366 assert(false, "Got bad mdtype: %d", (int) mdtype);
1367 return NULL;
1368 }
1369 }
1370
1371 void Metaspace::purge(MetadataType mdtype) {
1372 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
1373 }
1374
1375 void Metaspace::purge() {
1376 MutexLockerEx cl(MetaspaceExpand_lock,
1377 Mutex::_no_safepoint_check_flag);
1378 purge(NonClassType);
1379 if (using_class_space()) {
1380 purge(ClassType);
1381 }
1382 }
1383
1384 bool Metaspace::contains(const void* ptr) {
1385 if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1386 return true;
1387 }
1388 return contains_non_shared(ptr);
1389 }
1390
1391 bool Metaspace::contains_non_shared(const void* ptr) {
1392 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1393 return true;
1394 }
1395
1396 return get_space_list(NonClassType)->contains(ptr);
1397 }
1398
1399 // ClassLoaderMetaspace
1400
1401 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1402 : _space_type(type)
1403 , _lock(lock)
1404 , _vsm(NULL)
1405 , _class_vsm(NULL)
1406 {
1407 initialize(lock, type);
1408 }
1409
1410 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1411 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1412 delete _vsm;
1413 if (Metaspace::using_class_space()) {
1414 delete _class_vsm;
1415 }
1416 }
1417
1418 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1419 Metachunk* chunk = get_initialization_chunk(type, mdtype);
1420 if (chunk != NULL) {
1421 // Add to this manager's list of chunks in use and make it the current_chunk().
1422 get_space_manager(mdtype)->add_chunk(chunk, true);
1423 }
1424 }
1425
1426 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1427 size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1428
1429 // Get a chunk from the chunk freelist
1430 Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1431
1432 if (chunk == NULL) {
1433 chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1434 get_space_manager(mdtype)->medium_chunk_bunch());
1435 }
1436
1437 return chunk;
1438 }
1439
1440 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1441 Metaspace::verify_global_initialization();
1442
1443 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1444
1445 // Allocate SpaceManager for metadata objects.
1446 _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1447
1448 if (Metaspace::using_class_space()) {
1449 // Allocate SpaceManager for classes.
1450 _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1451 }
1452
1453 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1454
1455 // Allocate chunk for metadata objects
1456 initialize_first_chunk(type, Metaspace::NonClassType);
1457
1458 // Allocate chunk for class metadata objects
1459 if (Metaspace::using_class_space()) {
1460 initialize_first_chunk(type, Metaspace::ClassType);
1461 }
1462 }
1463
1464 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1465 Metaspace::assert_not_frozen();
1466
1467 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1468
1469 // Don't use class_vsm() unless UseCompressedClassPointers is true.
1470 if (Metaspace::is_class_space_allocation(mdtype)) {
1471 return class_vsm()->allocate(word_size);
1472 } else {
1473 return vsm()->allocate(word_size);
1474 }
1475 }
1476
1477 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1478 Metaspace::assert_not_frozen();
1479 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1480 assert(delta_bytes > 0, "Must be");
1481
1482 size_t before = 0;
1483 size_t after = 0;
1484 MetaWord* res;
1485 bool incremented;
1486
1487 // Each thread increments the HWM at most once. Even if the thread fails to increment
1488 // the HWM, an allocation is still attempted. This is because another thread must then
1489 // have incremented the HWM and therefore the allocation might still succeed.
1490 do {
1491 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
1492 res = allocate(word_size, mdtype);
1493 } while (!incremented && res == NULL);
1494
1495 if (incremented) {
1496 Metaspace::tracer()->report_gc_threshold(before, after,
1497 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1498 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1499 }
1500
1501 return res;
1502 }
1503
1504 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1505 return (vsm()->used_words() +
1506 (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1507 }
1508
1509 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1510 return (vsm()->capacity_words() +
1511 (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1512 }
1513
1514 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1515 Metaspace::assert_not_frozen();
1516 assert(!SafepointSynchronize::is_at_safepoint()
1517 || Thread::current()->is_VM_thread(), "should be the VM thread");
1518
1519 DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1520
1521 MutexLockerEx ml(vsm()->lock()->owned_by_self() ? NULL : vsm()->lock(),
1522 Mutex::_no_safepoint_check_flag);
1523
1524 if (is_class && Metaspace::using_class_space()) {
1525 class_vsm()->deallocate(ptr, word_size);
1526 } else {
1527 vsm()->deallocate(ptr, word_size);
1528 }
1529 }
1530
1531 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1532 assert(Metaspace::using_class_space(), "Has to use class space");
1533 return class_vsm()->calc_chunk_size(word_size);
1534 }
1535
1536 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1537 // Print both class virtual space counts and metaspace.
1538 if (Verbose) {
1539 vsm()->print_on(out);
1540 if (Metaspace::using_class_space()) {
1541 class_vsm()->print_on(out);
1542 }
1543 }
1544 }
1545
1546 void ClassLoaderMetaspace::verify() {
1547 vsm()->verify();
1548 if (Metaspace::using_class_space()) {
1549 class_vsm()->verify();
1550 }
1551 }
1552
1553 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1554 assert_lock_strong(lock());
1555 vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1556 if (Metaspace::using_class_space()) {
1557 class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1558 }
1559 }
1560
1561 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1562 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1563 add_to_statistics_locked(out);
1564 }
1565
1566 /////////////// Unit tests ///////////////
1567
1568 #ifndef PRODUCT
1569
1570 class TestMetaspaceUtilsTest : AllStatic {
1571 public:
1572 static void test_reserved() {
1573 size_t reserved = MetaspaceUtils::reserved_bytes();
1574
1575 assert(reserved > 0, "assert");
1576
1577 size_t committed = MetaspaceUtils::committed_bytes();
1578 assert(committed <= reserved, "assert");
1579
1580 size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType);
1581 assert(reserved_metadata > 0, "assert");
1582 assert(reserved_metadata <= reserved, "assert");
1583
1584 if (UseCompressedClassPointers) {
1585 size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType);
1586 assert(reserved_class > 0, "assert");
1587 assert(reserved_class < reserved, "assert");
1588 }
1589 }
1590
1591 static void test_committed() {
1592 size_t committed = MetaspaceUtils::committed_bytes();
1593
1594 assert(committed > 0, "assert");
1595
1596 size_t reserved = MetaspaceUtils::reserved_bytes();
1597 assert(committed <= reserved, "assert");
1598
1599 size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType);
1600 assert(committed_metadata > 0, "assert");
1601 assert(committed_metadata <= committed, "assert");
1602
1603 if (UseCompressedClassPointers) {
1604 size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
1605 assert(committed_class > 0, "assert");
1606 assert(committed_class < committed, "assert");
1607 }
1608 }
1609
1610 static void test_virtual_space_list_large_chunk() {
1611 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
1612 MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1613 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
1614 // vm_allocation_granularity aligned on Windows.
1615 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
1616 large_size += (os::vm_page_size()/BytesPerWord);
1617 vs_list->get_new_chunk(large_size, 0);
1618 }
1619
1620 static void test() {
1621 test_reserved();
1622 test_committed();
1623 test_virtual_space_list_large_chunk();
1624 }
1625 };
1626
1627 void TestMetaspaceUtils_test() {
1628 TestMetaspaceUtilsTest::test();
1629 }
1630
1631 class TestVirtualSpaceNodeTest {
1632 static void chunk_up(size_t words_left, size_t& num_medium_chunks,
1633 size_t& num_small_chunks,
1634 size_t& num_specialized_chunks) {
1635 num_medium_chunks = words_left / MediumChunk;
1636 words_left = words_left % MediumChunk;
1637
1638 num_small_chunks = words_left / SmallChunk;
1639 words_left = words_left % SmallChunk;
1640 // how many specialized chunks can we get?
1641 num_specialized_chunks = words_left / SpecializedChunk;
1642 assert(words_left % SpecializedChunk == 0, "should be nothing left");
1643 }
1644
1645 public:
1646 static void test() {
1647 MutexLockerEx ml(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1648 const size_t vsn_test_size_words = MediumChunk * 4;
1649 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
1650
1651 // The chunk sizes must be multiples of eachother, or this will fail
1652 STATIC_ASSERT(MediumChunk % SmallChunk == 0);
1653 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
1654
1655 { // No committed memory in VSN
1656 ChunkManager cm(false);
1657 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1658 vsn.initialize();
1659 vsn.retire(&cm);
1660 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
1661 }
1662
1663 { // All of VSN is committed, half is used by chunks
1664 ChunkManager cm(false);
1665 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1666 vsn.initialize();
1667 vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
1668 vsn.get_chunk_vs(MediumChunk);
1669 vsn.get_chunk_vs(MediumChunk);
1670 vsn.retire(&cm);
1671 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
1672 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
1673 }
1674
1675 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
1676 // This doesn't work for systems with vm_page_size >= 16K.
1677 if (page_chunks < MediumChunk) {
1678 // 4 pages of VSN is committed, some is used by chunks
1679 ChunkManager cm(false);
1680 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1681
1682 vsn.initialize();
1683 vsn.expand_by(page_chunks, page_chunks);
1684 vsn.get_chunk_vs(SmallChunk);
1685 vsn.get_chunk_vs(SpecializedChunk);
1686 vsn.retire(&cm);
1687
1688 // committed - used = words left to retire
1689 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
1690
1691 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1692 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1693
1694 assert(num_medium_chunks == 0, "should not get any medium chunks");
1695 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1696 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1697 }
1698
1699 { // Half of VSN is committed, a humongous chunk is used
1700 ChunkManager cm(false);
1701 VirtualSpaceNode vsn(false, vsn_test_size_bytes);
1702 vsn.initialize();
1703 vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
1704 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
1705 vsn.retire(&cm);
1706
1707 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
1708 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
1709 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
1710
1711 assert(num_medium_chunks == 0, "should not get any medium chunks");
1712 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
1713 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
1714 }
1715
1716 }
1717
1718 #define assert_is_available_positive(word_size) \
1719 assert(vsn.is_available(word_size), \
1720 #word_size ": " PTR_FORMAT " bytes were not available in " \
1721 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1722 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1723
1724 #define assert_is_available_negative(word_size) \
1725 assert(!vsn.is_available(word_size), \
1726 #word_size ": " PTR_FORMAT " bytes should not be available in " \
1727 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
1728 (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end()));
1729
1730 static void test_is_available_positive() {
1731 // Reserve some memory.
1732 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1733 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1734
1735 // Commit some memory.
1736 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1737 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1738 assert(expanded, "Failed to commit");
1739
1740 // Check that is_available accepts the committed size.
1741 assert_is_available_positive(commit_word_size);
1742
1743 // Check that is_available accepts half the committed size.
1744 size_t expand_word_size = commit_word_size / 2;
1745 assert_is_available_positive(expand_word_size);
1746 }
1747
1748 static void test_is_available_negative() {
1749 // Reserve some memory.
1750 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1751 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1752
1753 // Commit some memory.
1754 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1755 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1756 assert(expanded, "Failed to commit");
1757
1758 // Check that is_available doesn't accept a too large size.
1759 size_t two_times_commit_word_size = commit_word_size * 2;
1760 assert_is_available_negative(two_times_commit_word_size);
1761 }
1762
1763 static void test_is_available_overflow() {
1764 // Reserve some memory.
1765 VirtualSpaceNode vsn(false, os::vm_allocation_granularity());
1766 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
1767
1768 // Commit some memory.
1769 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
1770 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
1771 assert(expanded, "Failed to commit");
1772
1773 // Calculate a size that will overflow the virtual space size.
1774 void* virtual_space_max = (void*)(uintptr_t)-1;
1775 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
1776 size_t overflow_size = bottom_to_max + BytesPerWord;
1777 size_t overflow_word_size = overflow_size / BytesPerWord;
1778
1779 // Check that is_available can handle the overflow.
1780 assert_is_available_negative(overflow_word_size);
1781 }
1782
1783 static void test_is_available() {
1784 TestVirtualSpaceNodeTest::test_is_available_positive();
1785 TestVirtualSpaceNodeTest::test_is_available_negative();
1786 TestVirtualSpaceNodeTest::test_is_available_overflow();
1787 }
1788 };
1789
1790 #endif // !PRODUCT
1791
1792 struct chunkmanager_statistics_t {
1793 int num_specialized_chunks;
1794 int num_small_chunks;
1795 int num_medium_chunks;
1796 int num_humongous_chunks;
1797 };
1798
1799 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1800 ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1801 ChunkManagerStatistics stat;
1802 chunk_manager->collect_statistics(&stat);
1803 out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1804 out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1805 out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1806 out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1807 }
1808
1809 struct chunk_geometry_t {
1810 size_t specialized_chunk_word_size;
1811 size_t small_chunk_word_size;
1812 size_t medium_chunk_word_size;
1813 };
1814
1815 extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) {
1816 if (mdType == Metaspace::NonClassType) {
1817 out->specialized_chunk_word_size = SpecializedChunk;
1818 out->small_chunk_word_size = SmallChunk;
1819 out->medium_chunk_word_size = MediumChunk;
1820 } else {
1821 out->specialized_chunk_word_size = ClassSpecializedChunk;
1822 out->small_chunk_word_size = ClassSmallChunk;
1823 out->medium_chunk_word_size = ClassMediumChunk;
1824 }
1825 }