93
94 friend class MetaspaceShared;
95
96 public:
97 enum MetadataType {
98 ClassType,
99 NonClassType,
100 MetadataTypeCount
101 };
102 enum MetaspaceType {
103 ZeroMetaspaceType = 0,
104 StandardMetaspaceType = ZeroMetaspaceType,
105 BootMetaspaceType = StandardMetaspaceType + 1,
106 UnsafeAnonymousMetaspaceType = BootMetaspaceType + 1,
107 ReflectionMetaspaceType = UnsafeAnonymousMetaspaceType + 1,
108 MetaspaceTypeCount
109 };
110
111 private:
112
113 // Align up the word size to the allocation word size
114 static size_t align_word_size_up(size_t);
115
116 // Aligned size of the metaspace.
117 static size_t _compressed_class_space_size;
118
119 static size_t compressed_class_space_size() {
120 return _compressed_class_space_size;
121 }
122
123 static void set_compressed_class_space_size(size_t size) {
124 _compressed_class_space_size = size;
125 }
126
127 static size_t _first_chunk_word_size;
128 static size_t _first_class_chunk_word_size;
129
130 static size_t _commit_alignment;
131 static size_t _reserve_alignment;
132 DEBUG_ONLY(static bool _frozen;)
133
134 // Virtual Space lists for both classes and other metadata
135 static metaspace::VirtualSpaceList* _space_list;
136 static metaspace::VirtualSpaceList* _class_space_list;
137
138 static metaspace::ChunkManager* _chunk_manager_metadata;
139 static metaspace::ChunkManager* _chunk_manager_class;
140
141 static const MetaspaceTracer* _tracer;
142
143 static bool _initialized;
144
145 public:
146 static metaspace::VirtualSpaceList* space_list() { return _space_list; }
147 static metaspace::VirtualSpaceList* class_space_list() { return _class_space_list; }
148 static metaspace::VirtualSpaceList* get_space_list(MetadataType mdtype) {
149 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
150 return mdtype == ClassType ? class_space_list() : space_list();
151 }
152
153 static metaspace::ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
154 static metaspace::ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
155 static metaspace::ChunkManager* get_chunk_manager(MetadataType mdtype) {
156 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
157 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
158 }
159
160 // convenience function
161 static metaspace::ChunkManager* get_chunk_manager(bool is_class) {
162 return is_class ? chunk_manager_class() : chunk_manager_metadata();
163 }
164
165 static const MetaspaceTracer* tracer() { return _tracer; }
166 static void freeze() {
167 assert(DumpSharedSpaces, "sanity");
168 DEBUG_ONLY(_frozen = true;)
169 }
170 static void assert_not_frozen() {
171 assert(!_frozen, "sanity");
172 }
176
177 private:
178
179 #ifdef _LP64
180 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
181
182 // Returns true if can use CDS with metaspace allocated as specified address.
183 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
184
185 static void initialize_class_space(ReservedSpace rs);
186 #endif
187
188 public:
189
190 static void ergo_initialize();
191 static void global_initialize();
192 static void post_initialize();
193
194 static void verify_global_initialization();
195
196 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
197 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
198
199 static size_t reserve_alignment() { return _reserve_alignment; }
200 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
201 static size_t commit_alignment() { return _commit_alignment; }
202 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
203
204 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
205 MetaspaceObj::Type type, TRAPS);
206
207 static bool contains(const void* ptr);
208 static bool contains_non_shared(const void* ptr);
209
210 // Free empty virtualspaces
211 static void purge(MetadataType mdtype);
212 static void purge();
213
214 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
215 MetaspaceObj::Type type, MetadataType mdtype, TRAPS);
216
217 static const char* metadata_type_name(Metaspace::MetadataType mdtype);
218
219 static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
220
221 // Return TRUE only if UseCompressedClassPointers is True.
222 static bool using_class_space() {
223 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers);
224 }
225
226 static bool is_class_space_allocation(MetadataType mdType) {
227 return mdType == ClassType && using_class_space();
228 }
229
230 static bool initialized() { return _initialized; }
231
232 };
233
234 // Manages the metaspace portion belonging to a class loader
235 class ClassLoaderMetaspace : public CHeapObj<mtClass> {
236 friend class CollectedHeap; // For expand_and_allocate()
237 friend class ZCollectedHeap; // For expand_and_allocate()
238 friend class ShenandoahHeap; // For expand_and_allocate()
239 friend class Metaspace;
240 friend class MetaspaceUtils;
241 friend class metaspace::PrintCLDMetaspaceInfoClosure;
242 friend class VM_CollectForMetadataAllocation; // For expand_and_allocate()
243
244 private:
245
246 void initialize(Mutex* lock, Metaspace::MetaspaceType type);
247
248 // Initialize the first chunk for a Metaspace. Used for
249 // special cases such as the boot class loader, reflection
250 // class loader and anonymous class loader.
251 void initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype);
252 metaspace::Metachunk* get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype);
253
254 const Metaspace::MetaspaceType _space_type;
255 Mutex* const _lock;
256 metaspace::SpaceManager* _vsm;
257 metaspace::SpaceManager* _class_vsm;
258
259 metaspace::SpaceManager* vsm() const { return _vsm; }
260 metaspace::SpaceManager* class_vsm() const { return _class_vsm; }
261 metaspace::SpaceManager* get_space_manager(Metaspace::MetadataType mdtype) {
262 assert(mdtype != Metaspace::MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
263 return mdtype == Metaspace::ClassType ? class_vsm() : vsm();
264 }
265
266 Mutex* lock() const { return _lock; }
267
268 MetaWord* expand_and_allocate(size_t size, Metaspace::MetadataType mdtype);
269
270 size_t class_chunk_size(size_t word_size);
271
272 // Adds to the given statistic object. Must be locked with CLD metaspace lock.
273 void add_to_statistics_locked(metaspace::ClassLoaderMetaspaceStatistics* out) const;
274
275 Metaspace::MetaspaceType space_type() const { return _space_type; }
276
277 public:
278
279 ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type);
280 ~ClassLoaderMetaspace();
281
282 // Allocate space for metadata of type mdtype. This is space
283 // within a Metachunk and is used by
284 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
285 MetaWord* allocate(size_t word_size, Metaspace::MetadataType mdtype);
286
287 size_t allocated_blocks_bytes() const;
288 size_t allocated_chunks_bytes() const;
289
290 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
291
292 void print_on(outputStream* st) const;
293 // Debugging support
294 void verify();
295
296 // Adds to the given statistic object. Will lock with CLD metaspace lock.
297 void add_to_statistics(metaspace::ClassLoaderMetaspaceStatistics* out) const;
298
299 }; // ClassLoaderMetaspace
300
301 class MetaspaceUtils : AllStatic {
302
303 // Spacemanager updates running counters.
304 friend class metaspace::SpaceManager;
305
306 // Special access for error reporting (checks without locks).
307 friend class oopDesc;
308 friend class Klass;
309
310 // Running counters for statistics concerning in-use chunks.
311 // Note: capacity = used + free + waste + overhead. Note that we do not
312 // count free and waste. Their sum can be deduces from the three other values.
313 // For more details, one should call print_report() from within a safe point.
314 static size_t _capacity_words [Metaspace:: MetadataTypeCount];
315 static size_t _overhead_words [Metaspace:: MetadataTypeCount];
316 static volatile size_t _used_words [Metaspace:: MetadataTypeCount];
317
318 // Atomically decrement or increment in-use statistic counters
319 static void dec_capacity(Metaspace::MetadataType mdtype, size_t words);
320 static void inc_capacity(Metaspace::MetadataType mdtype, size_t words);
321 static void dec_used(Metaspace::MetadataType mdtype, size_t words);
322 static void inc_used(Metaspace::MetadataType mdtype, size_t words);
323 static void dec_overhead(Metaspace::MetadataType mdtype, size_t words);
324 static void inc_overhead(Metaspace::MetadataType mdtype, size_t words);
325
326
327 // Getters for the in-use counters.
328 static size_t capacity_words(Metaspace::MetadataType mdtype) { return _capacity_words[mdtype]; }
329 static size_t used_words(Metaspace::MetadataType mdtype) { return _used_words[mdtype]; }
330 static size_t overhead_words(Metaspace::MetadataType mdtype) { return _overhead_words[mdtype]; }
331
332 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
333
334 // Helper for print_xx_report.
335 static void print_vs(outputStream* out, size_t scale);
336
337 public:
338
339 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
340 // output will be the accumulated values for all live metaspaces.
341 // Note: method does not do any locking.
342 static void collect_statistics(metaspace::ClassLoaderMetaspaceStatistics* out);
343
344 // Used by MetaspaceCounters
345 static size_t free_chunks_total_words();
346 static size_t free_chunks_total_bytes();
347 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
348
349 static size_t capacity_words() {
350 return capacity_words(Metaspace::NonClassType) +
351 capacity_words(Metaspace::ClassType);
352 }
353 static size_t capacity_bytes(Metaspace::MetadataType mdtype) {
354 return capacity_words(mdtype) * BytesPerWord;
355 }
369 }
370
371 // Space committed but yet unclaimed by any class loader.
372 static size_t free_in_vs_bytes();
373 static size_t free_in_vs_bytes(Metaspace::MetadataType mdtype);
374
375 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
376 static size_t reserved_bytes() {
377 return reserved_bytes(Metaspace::ClassType) +
378 reserved_bytes(Metaspace::NonClassType);
379 }
380
381 static size_t committed_bytes(Metaspace::MetadataType mdtype);
382 static size_t committed_bytes() {
383 return committed_bytes(Metaspace::ClassType) +
384 committed_bytes(Metaspace::NonClassType);
385 }
386
387 static size_t min_chunk_size_words();
388
389 // Flags for print_report().
390 enum ReportFlag {
391 // Show usage by class loader.
392 rf_show_loaders = (1 << 0),
393 // Breaks report down by chunk type (small, medium, ...).
394 rf_break_down_by_chunktype = (1 << 1),
395 // Breaks report down by space type (anonymous, reflection, ...).
396 rf_break_down_by_spacetype = (1 << 2),
397 // Print details about the underlying virtual spaces.
398 rf_show_vslist = (1 << 3),
399 // Print metaspace map.
400 rf_show_vsmap = (1 << 4),
401 // If show_loaders: show loaded classes for each loader.
402 rf_show_classes = (1 << 5)
403 };
404
405 // This will print out a basic metaspace usage report but
406 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
407 static void print_basic_report(outputStream* st, size_t scale);
408
409 // Prints a report about the current metaspace state.
410 // Optional parts can be enabled via flags.
411 // Function will walk the CLDG and will lock the expand lock; if that is not
412 // convenient, use print_basic_report() instead.
413 static void print_report(outputStream* out, size_t scale = 0, int flags = 0);
414
415 static bool has_chunk_free_list(Metaspace::MetadataType mdtype);
416 static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);
417
418 // Log change in used metadata.
419 static void print_metaspace_change(const metaspace::MetaspaceSizesSnapshot& pre_meta_values);
420 static void print_on(outputStream * out);
421
422 // Prints an ASCII representation of the given space.
423 static void print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype);
424
425 static void dump(outputStream* out);
426 static void verify_free_chunks();
427 // Check internal counters (capacity, used).
428 static void verify_metrics();
429 };
430
431 // Metaspace are deallocated when their class loader are GC'ed.
432 // This class implements a policy for inducing GC's to recover
433 // Metaspaces.
434
435 class MetaspaceGC : AllStatic {
436
437 // The current high-water-mark for inducing a GC.
438 // When committed memory of all metaspaces reaches this value,
439 // a GC is induced and the value is increased. Size is in bytes.
440 static volatile size_t _capacity_until_GC;
441
442 // For a CMS collection, signal that a concurrent collection should
443 // be started.
444 static bool _should_concurrent_collect;
445
446 static uint _shrink_factor;
447
448 static size_t shrink_factor() { return _shrink_factor; }
449 void set_shrink_factor(uint v) { _shrink_factor = v; }
450
451 public:
452
453 static void initialize();
454 static void post_initialize();
455
456 static size_t capacity_until_GC();
457 static bool inc_capacity_until_GC(size_t v,
458 size_t* new_cap_until_GC = NULL,
459 size_t* old_cap_until_GC = NULL,
460 bool* can_retry = NULL);
461 static size_t dec_capacity_until_GC(size_t v);
462
463 static bool should_concurrent_collect() { return _should_concurrent_collect; }
464 static void set_should_concurrent_collect(bool v) {
465 _should_concurrent_collect = v;
466 }
467
468 // The amount to increase the high-water-mark (_capacity_until_GC)
469 static size_t delta_capacity_until_GC(size_t bytes);
470
471 // Tells if we have can expand metaspace without hitting set limits.
472 static bool can_expand(size_t words, bool is_class);
473
474 // Returns amount that we can expand without hitting a GC,
475 // measured in words.
476 static size_t allowed_expansion();
477
478 // Calculate the new high-water mark at which to induce
479 // a GC.
480 static void compute_new_size();
481 };
482
483 #endif // SHARE_MEMORY_METASPACE_HPP
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93
94 friend class MetaspaceShared;
95
96 public:
97 enum MetadataType {
98 ClassType,
99 NonClassType,
100 MetadataTypeCount
101 };
102 enum MetaspaceType {
103 ZeroMetaspaceType = 0,
104 StandardMetaspaceType = ZeroMetaspaceType,
105 BootMetaspaceType = StandardMetaspaceType + 1,
106 UnsafeAnonymousMetaspaceType = BootMetaspaceType + 1,
107 ReflectionMetaspaceType = UnsafeAnonymousMetaspaceType + 1,
108 MetaspaceTypeCount
109 };
110
111 private:
112
113 // Aligned size of the metaspace.
114 static size_t _compressed_class_space_size;
115
116 static size_t compressed_class_space_size() { return _compressed_class_space_size; }
117 static void set_compressed_class_space_size(size_t size) { _compressed_class_space_size = size; }
118
119 static size_t _commit_alignment;
120 static size_t _reserve_alignment;
121 DEBUG_ONLY(static bool _frozen;)
122
123 // Virtual Space lists for both classes and other metadata
124 static metaspace::VirtualSpaceList* _space_list;
125 static metaspace::VirtualSpaceList* _class_space_list;
126
127 static metaspace::ChunkManager* _chunk_manager_metadata;
128 static metaspace::ChunkManager* _chunk_manager_class;
129
130 static const MetaspaceTracer* _tracer;
131
132 static bool _initialized;
133
134 static metaspace::VirtualSpaceList* space_list() { return _space_list; }
135 static metaspace::VirtualSpaceList* class_space_list() { return _class_space_list; }
136
137 static metaspace::VirtualSpaceList* get_space_list(MetadataType mdtype) {
138 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
139 return mdtype == ClassType ? class_space_list() : space_list();
140 }
141
142 public:
143
144
145 static metaspace::ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
146 static metaspace::ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
147 static metaspace::ChunkManager* get_chunk_manager(MetadataType mdtype) {
148 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
149 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
150 }
151
152 // convenience function
153 static metaspace::ChunkManager* get_chunk_manager(bool is_class) {
154 return is_class ? chunk_manager_class() : chunk_manager_metadata();
155 }
156
157 static const MetaspaceTracer* tracer() { return _tracer; }
158 static void freeze() {
159 assert(DumpSharedSpaces, "sanity");
160 DEBUG_ONLY(_frozen = true;)
161 }
162 static void assert_not_frozen() {
163 assert(!_frozen, "sanity");
164 }
168
169 private:
170
171 #ifdef _LP64
172 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
173
174 // Returns true if can use CDS with metaspace allocated as specified address.
175 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
176
177 static void initialize_class_space(ReservedSpace rs);
178 #endif
179
180 public:
181
182 static void ergo_initialize();
183 static void global_initialize();
184 static void post_initialize();
185
186 static void verify_global_initialization();
187
188 // The alignment at which Metaspace mappings are reserved.
189 static size_t reserve_alignment() { return _reserve_alignment; }
190 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
191
192 // The granularity at which Metaspace is committed and uncommitted.
193 static size_t commit_alignment() { return _commit_alignment; }
194 static size_t commit_words() { return _commit_alignment / BytesPerWord; }
195
196 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
197 MetaspaceObj::Type type, TRAPS);
198
199 static bool contains(const void* ptr);
200 static bool contains_non_shared(const void* ptr);
201
202 // Free empty virtualspaces
203 static void purge(MetadataType mdtype);
204
205 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
206 MetaspaceObj::Type type, MetadataType mdtype, TRAPS);
207
208 static const char* metadata_type_name(Metaspace::MetadataType mdtype);
209
210 static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
211
212 // Return TRUE only if UseCompressedClassPointers is True.
213 static bool using_class_space() {
214 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers);
215 }
216
217 static bool is_class_space_allocation(MetadataType mdType) {
218 return mdType == ClassType && using_class_space();
219 }
220
221 static bool initialized() { return _initialized; }
222
223 };
224
225 class MetaspaceUtils : AllStatic {
226
227 // Spacemanager updates running counters.
228 friend class metaspace::SpaceManager;
229
230 // Special access for error reporting (checks without locks).
231 friend class oopDesc;
232 friend class Klass;
233
234 // Running counters for statistics concerning in-use chunks.
235 // Note: capacity = used + free + waste + overhead. Note that we do not
236 // count free and waste. Their sum can be deduces from the three other values.
237 // For more details, one should call print_report() from within a safe point.
238 static size_t _capacity_words [Metaspace:: MetadataTypeCount];
239 static size_t _overhead_words [Metaspace:: MetadataTypeCount];
240 static volatile size_t _used_words [Metaspace:: MetadataTypeCount];
241
242 // Atomically decrement or increment in-use statistic counters
243 static void dec_capacity(Metaspace::MetadataType mdtype, size_t words);
244 static void inc_capacity(Metaspace::MetadataType mdtype, size_t words);
245 static void dec_used(Metaspace::MetadataType mdtype, size_t words);
246 static void inc_used(Metaspace::MetadataType mdtype, size_t words);
247 static void dec_overhead(Metaspace::MetadataType mdtype, size_t words);
248 static void inc_overhead(Metaspace::MetadataType mdtype, size_t words);
249
250
251 // Getters for the in-use counters.
252 static size_t capacity_words(Metaspace::MetadataType mdtype) { return _capacity_words[mdtype]; }
253 static size_t used_words(Metaspace::MetadataType mdtype) { return _used_words[mdtype]; }
254 static size_t overhead_words(Metaspace::MetadataType mdtype) { return _overhead_words[mdtype]; }
255
256 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
257
258
259 public:
260
261 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
262 // output will be the accumulated values for all live metaspaces.
263 // Note: method does not do any locking.
264 static void collect_statistics(metaspace::ClassLoaderMetaspaceStatistics* out);
265
266 // Used by MetaspaceCounters
267 static size_t free_chunks_total_words();
268 static size_t free_chunks_total_bytes();
269 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
270
271 static size_t capacity_words() {
272 return capacity_words(Metaspace::NonClassType) +
273 capacity_words(Metaspace::ClassType);
274 }
275 static size_t capacity_bytes(Metaspace::MetadataType mdtype) {
276 return capacity_words(mdtype) * BytesPerWord;
277 }
291 }
292
293 // Space committed but yet unclaimed by any class loader.
294 static size_t free_in_vs_bytes();
295 static size_t free_in_vs_bytes(Metaspace::MetadataType mdtype);
296
297 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
298 static size_t reserved_bytes() {
299 return reserved_bytes(Metaspace::ClassType) +
300 reserved_bytes(Metaspace::NonClassType);
301 }
302
303 static size_t committed_bytes(Metaspace::MetadataType mdtype);
304 static size_t committed_bytes() {
305 return committed_bytes(Metaspace::ClassType) +
306 committed_bytes(Metaspace::NonClassType);
307 }
308
309 static size_t min_chunk_size_words();
310
311 static bool has_chunk_free_list(Metaspace::MetadataType mdtype);
312 static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);
313
314 // Log change in used metadata.
315 static void print_metaspace_change(const metaspace::MetaspaceSizesSnapshot& pre_meta_values);
316 static void print_on(outputStream * out);
317
318 // Prints an ASCII representation of the given space.
319 static void print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype);
320
321 static void dump(outputStream* out);
322 static void verify_free_chunks();
323 // Check internal counters (capacity, used).
324 static void verify_metrics();
325 };
326
327 #endif // SHARE_MEMORY_METASPACE_HPP
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