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 #ifndef SHARE_MEMORY_METASPACE_HPP
25 #define SHARE_MEMORY_METASPACE_HPP
26
27 #include "memory/allocation.hpp"
28 #include "memory/memRegion.hpp"
29 #include "memory/metaspaceChunkFreeListSummary.hpp"
30 #include "memory/virtualspace.hpp"
31 #include "memory/metaspace/metaspaceSizesSnapshot.hpp"
32 #include "utilities/exceptions.hpp"
33
34 // Metaspace
35 //
36 // Metaspaces are Arenas for the VM's metadata.
37 // They are allocated one per class loader object, and one for the null
38 // bootstrap class loader
39 //
40 // block X ---+ +-------------------+
41 // | | Virtualspace |
42 // | | |
43 // | | |
44 // | |-------------------|
45 // | || Chunk |
46 // | || |
47 // | ||---------- |
48 // +------>||| block 0 | |
49 // ||---------- |
50 // ||| block 1 | |
51 // ||---------- |
52 // || |
53 // |-------------------|
54 // | |
55 // | |
56 // +-------------------+
57 //
58
59 class ClassLoaderData;
60 class MetaspaceTracer;
61 class Mutex;
62 class outputStream;
63
64 class CollectedHeap;
65
66 namespace metaspace {
67 class ChunkManager;
68 class ClassLoaderMetaspaceStatistics;
69 class Metablock;
70 class Metachunk;
71 class PrintCLDMetaspaceInfoClosure;
72 class SpaceManager;
73 class VirtualSpaceList;
74 class VirtualSpaceNode;
75 }
76
77 // Metaspaces each have a SpaceManager and allocations
78 // are done by the SpaceManager. Allocations are done
79 // out of the current Metachunk. When the current Metachunk
80 // is exhausted, the SpaceManager gets a new one from
81 // the current VirtualSpace. When the VirtualSpace is exhausted
82 // the SpaceManager gets a new one. The SpaceManager
83 // also manages freelists of available Chunks.
84 //
85 // Currently the space manager maintains the list of
86 // virtual spaces and the list of chunks in use. Its
87 // allocate() method returns a block for use as a
88 // quantum of metadata.
89
90 // Namespace for important central static functions
91 // (auxiliary stuff goes into MetaspaceUtils)
92 class Metaspace : public AllStatic {
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 }
173 #ifdef _LP64
174 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
175 #endif
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 }
356 static size_t capacity_bytes() {
357 return capacity_words() * BytesPerWord;
358 }
359
360 static size_t used_words() {
361 return used_words(Metaspace::NonClassType) +
362 used_words(Metaspace::ClassType);
363 }
364 static size_t used_bytes(Metaspace::MetadataType mdtype) {
365 return used_words(mdtype) * BytesPerWord;
366 }
367 static size_t used_bytes() {
368 return used_words() * BytesPerWord;
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
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
|
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 #ifndef SHARE_MEMORY_METASPACE_HPP
25 #define SHARE_MEMORY_METASPACE_HPP
26
27 #include "memory/allocation.hpp"
28 #include "memory/metaspace/metaspaceEnums.hpp"
29 #include "memory/metaspaceChunkFreeListSummary.hpp"
30 #include "memory/virtualspace.hpp"
31 #include "utilities/exceptions.hpp"
32 #include "utilities/globalDefinitions.hpp"
33
34 // Metaspace
35 //
36 // Metaspaces are Arenas for the VM's metadata.
37 // They are allocated one per class loader object, and one for the null
38 // bootstrap class loader
39 //
40 // block X ---+ +-------------------+
41 // | | Virtualspace |
42 // | | |
43 // | | |
44 // | |-------------------|
45 // | || Chunk |
46 // | || |
47 // | ||---------- |
48 // +------>||| block 0 | |
49 // ||---------- |
50 // ||| block 1 | |
51 // ||---------- |
52 // || |
53 // |-------------------|
54 // | |
55 // | |
56 // +-------------------+
57 //
58
59 class ClassLoaderData;
60 class MetaspaceShared;
61 class MetaspaceTracer;
62 class outputStream;
63
64
65 namespace metaspace {
66 class MetaspaceSizesSnapshot;
67 }
68
69 ////////////////// Metaspace ///////////////////////
70
71 // Metaspaces each have a SpaceManager and allocations
72 // are done by the SpaceManager. Allocations are done
73 // out of the current Metachunk. When the current Metachunk
74 // is exhausted, the SpaceManager gets a new one from
75 // the current VirtualSpace. When the VirtualSpace is exhausted
76 // the SpaceManager gets a new one. The SpaceManager
77 // also manages freelists of available Chunks.
78 //
79 // Currently the space manager maintains the list of
80 // virtual spaces and the list of chunks in use. Its
81 // allocate() method returns a block for use as a
82 // quantum of metadata.
83
84 // Namespace for important central static functions
85 // (auxiliary stuff goes into MetaspaceUtils)
86 class Metaspace : public AllStatic {
87
88 friend class MetaspaceShared;
89
90 // Base and size of the compressed class space.
91 static MetaWord* _compressed_class_space_base;
92 static size_t _compressed_class_space_size;
93
94 static size_t _commit_alignment;
95 static size_t _reserve_alignment;
96 DEBUG_ONLY(static bool _frozen;)
97
98 static const MetaspaceTracer* _tracer;
99
100 static bool _initialized;
101
102 static MetaWord* compressed_class_space_base() { return _compressed_class_space_base; }
103 static size_t compressed_class_space_size() { return _compressed_class_space_size; }
104
105 public:
106
107 static const MetaspaceTracer* tracer() { return _tracer; }
108 static void freeze() {
109 assert(DumpSharedSpaces, "sanity");
110 DEBUG_ONLY(_frozen = true;)
111 }
112 static void assert_not_frozen() {
113 assert(!_frozen, "sanity");
114 }
115 #ifdef _LP64
116 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
117 #endif
118
119 private:
120
121 #ifdef _LP64
122 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
123
124 // Returns true if can use CDS with metaspace allocated as specified address.
125 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
126
127 static void initialize_class_space(ReservedSpace rs);
128 #endif
129
130 public:
131
132 static void ergo_initialize();
133 static void global_initialize();
134 static void post_initialize();
135
136 // The alignment at which Metaspace mappings are reserved.
137 static size_t reserve_alignment() { return _reserve_alignment; }
138 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
139
140 // The granularity at which Metaspace is committed and uncommitted.
141 static size_t commit_alignment() { return _commit_alignment; }
142 static size_t commit_words() { return _commit_alignment / BytesPerWord; }
143
144 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
145 MetaspaceObj::Type type, TRAPS);
146
147 static bool contains(const void* ptr);
148 static bool contains_non_shared(const void* ptr);
149
150 // Free empty virtualspaces
151 static void purge();
152
153 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
154 MetaspaceObj::Type type, metaspace::MetadataType mdtype, TRAPS);
155
156 static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
157
158 // Return TRUE only if UseCompressedClassPointers is True.
159 static bool using_class_space() {
160 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers);
161 }
162
163 static bool initialized() { return _initialized; }
164
165 };
166
167 ////////////////// MetaspaceGC ///////////////////////
168
169 // Metaspace are deallocated when their class loader are GC'ed.
170 // This class implements a policy for inducing GC's to recover
171 // Metaspaces.
172
173 class MetaspaceGCThresholdUpdater : public AllStatic {
174 public:
175 enum Type {
176 ComputeNewSize,
177 ExpandAndAllocate,
178 Last
179 };
180
181 static const char* to_string(MetaspaceGCThresholdUpdater::Type updater) {
182 switch (updater) {
183 case ComputeNewSize:
184 return "compute_new_size";
185 case ExpandAndAllocate:
186 return "expand_and_allocate";
187 default:
188 assert(false, "Got bad updater: %d", (int) updater);
189 return NULL;
190 };
191 }
192 };
193
194 class MetaspaceGC : public AllStatic {
195
196 // The current high-water-mark for inducing a GC.
197 // When committed memory of all metaspaces reaches this value,
198 // a GC is induced and the value is increased. Size is in bytes.
199 static volatile size_t _capacity_until_GC;
200
201 // For a CMS collection, signal that a concurrent collection should
202 // be started.
203 static bool _should_concurrent_collect;
204
205 static uint _shrink_factor;
206
207 static size_t shrink_factor() { return _shrink_factor; }
208 void set_shrink_factor(uint v) { _shrink_factor = v; }
209
210 public:
211
212 static void initialize();
213 static void post_initialize();
214
220 static size_t dec_capacity_until_GC(size_t v);
221
222 static bool should_concurrent_collect() { return _should_concurrent_collect; }
223 static void set_should_concurrent_collect(bool v) {
224 _should_concurrent_collect = v;
225 }
226
227 // The amount to increase the high-water-mark (_capacity_until_GC)
228 static size_t delta_capacity_until_GC(size_t bytes);
229
230 // Tells if we have can expand metaspace without hitting set limits.
231 static bool can_expand(size_t words, bool is_class);
232
233 // Returns amount that we can expand without hitting a GC,
234 // measured in words.
235 static size_t allowed_expansion();
236
237 // Calculate the new high-water mark at which to induce
238 // a GC.
239 static void compute_new_size();
240 };
241
242
243
244
245 class MetaspaceUtils : AllStatic {
246 public:
247
248 // Committed space actually in use by Metadata
249 static size_t used_words();
250 static size_t used_words(metaspace::MetadataType mdtype);
251
252 // Space committed for Metaspace
253 static size_t committed_words();
254 static size_t committed_words(metaspace::MetadataType mdtype);
255
256 // Space reserved for Metaspace
257 static size_t reserved_words();
258 static size_t reserved_words(metaspace::MetadataType mdtype);
259
260 // _bytes() variants for convenience...
261 static size_t used_bytes() { return used_words() * BytesPerWord; }
262 static size_t used_bytes(metaspace::MetadataType mdtype) { return used_words(mdtype) * BytesPerWord; }
263 static size_t committed_bytes() { return committed_words() * BytesPerWord; }
264 static size_t committed_bytes(metaspace::MetadataType mdtype) { return committed_words(mdtype) * BytesPerWord; }
265 static size_t reserved_bytes() { return reserved_words() * BytesPerWord; }
266 static size_t reserved_bytes(metaspace::MetadataType mdtype) { return reserved_words(mdtype) * BytesPerWord; }
267
268 // Todo. Consolidate.
269 // Committed space in freelists
270 static size_t free_chunks_total_words(metaspace::MetadataType mdtype);
271
272 // Todo. Implement or Consolidate.
273 static MetaspaceChunkFreeListSummary chunk_free_list_summary(metaspace::MetadataType mdtype) {
274 return MetaspaceChunkFreeListSummary(0,0,0,0,0,0,0,0);
275 }
276
277 // Log change in used metadata.
278 static void print_metaspace_change(const metaspace::MetaspaceSizesSnapshot& pre_meta_values);
279
280 // Prints an ASCII representation of the given space.
281 static void print_metaspace_map(outputStream* out, metaspace::MetadataType mdtype);
282
283 // This will print out a basic metaspace usage report but
284 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
285 static void print_basic_report(outputStream* st, size_t scale = 0);
286
287 // Prints a report about the current metaspace state.
288 // Function will walk the CLDG and will lock the expand lock; if that is not
289 // convenient, use print_basic_report() instead.
290 static void print_full_report(outputStream* out, size_t scale = 0);
291
292 static void print_on(outputStream * out);
293
294 DEBUG_ONLY(static void verify(bool slow);)
295
296 };
297
298 #endif // SHARE_MEMORY_METASPACE_HPP
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