88 public:
89 enum MetadataType {ClassType = 0,
90 NonClassType = ClassType + 1,
91 MetadataTypeCount = ClassType + 2
92 };
93 enum MetaspaceType {
94 StandardMetaspaceType,
95 BootMetaspaceType,
96 ROMetaspaceType,
97 ReadWriteMetaspaceType,
98 AnonymousMetaspaceType,
99 ReflectionMetaspaceType
100 };
101
102 private:
103 void initialize(Mutex* lock, MetaspaceType type);
104
105 // Align up the word size to the allocation word size
106 static size_t align_word_size_up(size_t);
107
108 static size_t _first_chunk_word_size;
109 static size_t _first_class_chunk_word_size;
110
111 SpaceManager* _vsm;
112 SpaceManager* vsm() const { return _vsm; }
113
114 SpaceManager* _class_vsm;
115 SpaceManager* class_vsm() const { return _class_vsm; }
116
117 // Allocate space for metadata of type mdtype. This is space
118 // within a Metachunk and is used by
119 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
120 // which returns a Metablock.
121 MetaWord* allocate(size_t word_size, MetadataType mdtype);
122
123 // Virtual Space lists for both classes and other metadata
124 static VirtualSpaceList* _space_list;
125 static VirtualSpaceList* _class_space_list;
126
127 static VirtualSpaceList* space_list() { return _space_list; }
128 static VirtualSpaceList* class_space_list() { return _class_space_list; }
129
130 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
131 // maintain a single list for now.
132 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
133
134 class AllocRecord : public CHeapObj<mtClass> {
135 public:
136 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
137 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
138 AllocRecord *_next;
139 address _ptr;
140 MetaspaceObj::Type _type;
141 int _byte_size;
142 };
143
144 AllocRecord * _alloc_record_head;
145 AllocRecord * _alloc_record_tail;
146
147 public:
148
149 Metaspace(Mutex* lock, MetaspaceType type);
150 ~Metaspace();
151
152 // Initialize globals for Metaspace
153 static void global_initialize();
154 static void initialize_class_space(ReservedSpace rs);
155
156 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
157 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
158
159 char* bottom() const;
160 size_t used_words_slow(MetadataType mdtype) const;
161 size_t free_words(MetadataType mdtype) const;
162 size_t capacity_words_slow(MetadataType mdtype) const;
163 size_t waste_words(MetadataType mdtype) const;
164
165 size_t used_bytes_slow(MetadataType mdtype) const;
166 size_t capacity_bytes_slow(MetadataType mdtype) const;
167
168 static Metablock* allocate(ClassLoaderData* loader_data, size_t word_size,
169 bool read_only, MetaspaceObj::Type type, TRAPS);
170 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
171
172 MetaWord* expand_and_allocate(size_t size,
173 MetadataType mdtype);
174
175 static bool is_initialized() { return _class_space_list != NULL; }
176
177 static bool contains(const void *ptr);
178 void dump(outputStream* const out) const;
179
180 // Free empty virtualspaces
181 static void purge();
182
183 void print_on(outputStream* st) const;
184 // Debugging support
185 void verify();
186
187 class AllocRecordClosure : public StackObj {
188 public:
189 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
190 };
191
192 void iterate(AllocRecordClosure *closure);
193 };
194
195 class MetaspaceAux : AllStatic {
196 static size_t free_chunks_total(Metaspace::MetadataType mdtype);
197 static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
198
199 public:
200 // Statistics for class space and data space in metaspace.
201
202 // These methods iterate over the classloader data graph
203 // for the given Metaspace type. These are slow.
204 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
205 static size_t free_in_bytes(Metaspace::MetadataType mdtype);
206 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
207
208 // Iterates over the virtual space list.
209 static size_t reserved_in_bytes(Metaspace::MetadataType mdtype);
210
211 // Running sum of space in all Metachunks that has been
212 // allocated to a Metaspace. This is used instead of
226 // Decrement and increment _allocated_used_words
227 static void dec_used(Metaspace::MetadataType type, size_t words);
228 static void inc_used(Metaspace::MetadataType type, size_t words);
229
230 // Total of space allocated to metadata in all Metaspaces.
231 // This sums the space used in each Metachunk by
232 // iterating over the classloader data graph
233 static size_t used_bytes_slow() {
234 return used_bytes_slow(Metaspace::ClassType) +
235 used_bytes_slow(Metaspace::NonClassType);
236 }
237
238 // Used by MetaspaceCounters
239 static size_t free_chunks_total();
240 static size_t free_chunks_total_in_bytes();
241
242 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
243 return _allocated_capacity_words[mdtype];
244 }
245 static size_t allocated_capacity_words() {
246 return _allocated_capacity_words[Metaspace::ClassType] +
247 _allocated_capacity_words[Metaspace::NonClassType];
248 }
249 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
250 return allocated_capacity_words(mdtype) * BytesPerWord;
251 }
252 static size_t allocated_capacity_bytes() {
253 return allocated_capacity_words() * BytesPerWord;
254 }
255
256 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
257 return _allocated_used_words[mdtype];
258 }
259 static size_t allocated_used_words() {
260 return _allocated_used_words[Metaspace::ClassType] +
261 _allocated_used_words[Metaspace::NonClassType];
262 }
263 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
264 return allocated_used_words(mdtype) * BytesPerWord;
265 }
266 static size_t allocated_used_bytes() {
267 return allocated_used_words() * BytesPerWord;
268 }
269
270 static size_t free_bytes();
271
272 // Total capacity in all Metaspaces
273 static size_t capacity_bytes_slow() {
274 #ifdef PRODUCT
275 // Use allocated_capacity_bytes() in PRODUCT instead of this function.
276 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
277 #endif
278 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
279 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
280 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity,
281 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT
283 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
284 allocated_capacity_bytes(), class_capacity + non_class_capacity,
285 class_capacity, non_class_capacity));
286
287 return class_capacity + non_class_capacity;
288 }
289
290 // Total space reserved in all Metaspaces
291 static size_t reserved_in_bytes() {
292 return reserved_in_bytes(Metaspace::ClassType) +
293 reserved_in_bytes(Metaspace::NonClassType);
294 }
295
296 static size_t min_chunk_size();
297
298 // Print change in used metadata.
299 static void print_metaspace_change(size_t prev_metadata_used);
300 static void print_on(outputStream * out);
301 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
302
303 static void print_waste(outputStream* out);
304 static void dump(outputStream* out);
305 static void verify_free_chunks();
306 // Checks that the values returned by allocated_capacity_bytes() and
307 // capacity_bytes_slow() are the same.
308 static void verify_capacity();
309 static void verify_used();
310 static void verify_metrics();
311 };
312
313 // Metaspace are deallocated when their class loader are GC'ed.
314 // This class implements a policy for inducing GC's to recover
315 // Metaspaces.
316
317 class MetaspaceGC : AllStatic {
318
319 // The current high-water-mark for inducing a GC. When
320 // the capacity of all space in the virtual lists reaches this value,
321 // a GC is induced and the value is increased. This should be changed
322 // to the space actually used for allocations to avoid affects of
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88 public:
89 enum MetadataType {ClassType = 0,
90 NonClassType = ClassType + 1,
91 MetadataTypeCount = ClassType + 2
92 };
93 enum MetaspaceType {
94 StandardMetaspaceType,
95 BootMetaspaceType,
96 ROMetaspaceType,
97 ReadWriteMetaspaceType,
98 AnonymousMetaspaceType,
99 ReflectionMetaspaceType
100 };
101
102 private:
103 void initialize(Mutex* lock, MetaspaceType type);
104
105 // Align up the word size to the allocation word size
106 static size_t align_word_size_up(size_t);
107
108 // Aligned size of the metaspace.
109 static size_t _class_metaspace_size;
110
111 static size_t class_metaspace_size() {
112 return _class_metaspace_size;
113 }
114 static void set_class_metaspace_size(size_t metaspace_size) {
115 _class_metaspace_size = metaspace_size;
116 }
117
118 static size_t _first_chunk_word_size;
119 static size_t _first_class_chunk_word_size;
120
121 SpaceManager* _vsm;
122 SpaceManager* vsm() const { return _vsm; }
123
124 SpaceManager* _class_vsm;
125 SpaceManager* class_vsm() const { return _class_vsm; }
126
127 // Allocate space for metadata of type mdtype. This is space
128 // within a Metachunk and is used by
129 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
130 // which returns a Metablock.
131 MetaWord* allocate(size_t word_size, MetadataType mdtype);
132
133 // Virtual Space lists for both classes and other metadata
134 static VirtualSpaceList* _space_list;
135 static VirtualSpaceList* _class_space_list;
136
137 static VirtualSpaceList* space_list() { return _space_list; }
138 static VirtualSpaceList* class_space_list() { return _class_space_list; }
139
140 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
141 // maintain a single list for now.
142 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
143
144 #ifdef _LP64
145 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
146
147 // Returns true if can use CDS with metaspace allocated as specified address.
148 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
149
150 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
151
152 static void initialize_class_space(ReservedSpace rs);
153 #endif
154
155 class AllocRecord : public CHeapObj<mtClass> {
156 public:
157 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
158 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
159 AllocRecord *_next;
160 address _ptr;
161 MetaspaceObj::Type _type;
162 int _byte_size;
163 };
164
165 AllocRecord * _alloc_record_head;
166 AllocRecord * _alloc_record_tail;
167
168 public:
169
170 Metaspace(Mutex* lock, MetaspaceType type);
171 ~Metaspace();
172
173 // Initialize globals for Metaspace
174 static void global_initialize();
175
176 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
177 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
178
179 char* bottom() const;
180 size_t used_words_slow(MetadataType mdtype) const;
181 size_t free_words(MetadataType mdtype) const;
182 size_t capacity_words_slow(MetadataType mdtype) const;
183 size_t waste_words(MetadataType mdtype) const;
184
185 size_t used_bytes_slow(MetadataType mdtype) const;
186 size_t capacity_bytes_slow(MetadataType mdtype) const;
187
188 static Metablock* allocate(ClassLoaderData* loader_data, size_t word_size,
189 bool read_only, MetaspaceObj::Type type, TRAPS);
190 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
191
192 MetaWord* expand_and_allocate(size_t size,
193 MetadataType mdtype);
194
195 static bool contains(const void *ptr);
196 void dump(outputStream* const out) const;
197
198 // Free empty virtualspaces
199 static void purge();
200
201 void print_on(outputStream* st) const;
202 // Debugging support
203 void verify();
204
205 class AllocRecordClosure : public StackObj {
206 public:
207 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
208 };
209
210 void iterate(AllocRecordClosure *closure);
211
212 // Return TRUE only if UseCompressedKlassPointers is True and DumpSharedSpaces is False.
213 static bool using_class_space() {
214 return NOT_LP64(false) LP64_ONLY(UseCompressedKlassPointers && !DumpSharedSpaces);
215 }
216
217 };
218
219 class MetaspaceAux : AllStatic {
220 static size_t free_chunks_total(Metaspace::MetadataType mdtype);
221 static size_t free_chunks_total_in_bytes(Metaspace::MetadataType mdtype);
222
223 public:
224 // Statistics for class space and data space in metaspace.
225
226 // These methods iterate over the classloader data graph
227 // for the given Metaspace type. These are slow.
228 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
229 static size_t free_in_bytes(Metaspace::MetadataType mdtype);
230 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
231
232 // Iterates over the virtual space list.
233 static size_t reserved_in_bytes(Metaspace::MetadataType mdtype);
234
235 // Running sum of space in all Metachunks that has been
236 // allocated to a Metaspace. This is used instead of
250 // Decrement and increment _allocated_used_words
251 static void dec_used(Metaspace::MetadataType type, size_t words);
252 static void inc_used(Metaspace::MetadataType type, size_t words);
253
254 // Total of space allocated to metadata in all Metaspaces.
255 // This sums the space used in each Metachunk by
256 // iterating over the classloader data graph
257 static size_t used_bytes_slow() {
258 return used_bytes_slow(Metaspace::ClassType) +
259 used_bytes_slow(Metaspace::NonClassType);
260 }
261
262 // Used by MetaspaceCounters
263 static size_t free_chunks_total();
264 static size_t free_chunks_total_in_bytes();
265
266 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
267 return _allocated_capacity_words[mdtype];
268 }
269 static size_t allocated_capacity_words() {
270 return _allocated_capacity_words[Metaspace::NonClassType] +
271 (Metaspace::using_class_space() ?
272 _allocated_capacity_words[Metaspace::ClassType] : 0);
273 }
274 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
275 return allocated_capacity_words(mdtype) * BytesPerWord;
276 }
277 static size_t allocated_capacity_bytes() {
278 return allocated_capacity_words() * BytesPerWord;
279 }
280
281 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
282 return _allocated_used_words[mdtype];
283 }
284 static size_t allocated_used_words() {
285 return _allocated_used_words[Metaspace::NonClassType] +
286 (Metaspace::using_class_space() ?
287 _allocated_used_words[Metaspace::ClassType] : 0);
288 }
289 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
290 return allocated_used_words(mdtype) * BytesPerWord;
291 }
292 static size_t allocated_used_bytes() {
293 return allocated_used_words() * BytesPerWord;
294 }
295
296 static size_t free_bytes();
297
298 // Total capacity in all Metaspaces
299 static size_t capacity_bytes_slow() {
300 #ifdef PRODUCT
301 // Use allocated_capacity_bytes() in PRODUCT instead of this function.
302 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
303 #endif
304 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
305 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
306 assert(allocated_capacity_bytes() == class_capacity + non_class_capacity,
307 err_msg("bad accounting: allocated_capacity_bytes() " SIZE_FORMAT
309 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
310 allocated_capacity_bytes(), class_capacity + non_class_capacity,
311 class_capacity, non_class_capacity));
312
313 return class_capacity + non_class_capacity;
314 }
315
316 // Total space reserved in all Metaspaces
317 static size_t reserved_in_bytes() {
318 return reserved_in_bytes(Metaspace::ClassType) +
319 reserved_in_bytes(Metaspace::NonClassType);
320 }
321
322 static size_t min_chunk_size();
323
324 // Print change in used metadata.
325 static void print_metaspace_change(size_t prev_metadata_used);
326 static void print_on(outputStream * out);
327 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
328
329 static void print_class_waste(outputStream* out);
330 static void print_waste(outputStream* out);
331 static void dump(outputStream* out);
332 static void verify_free_chunks();
333 // Checks that the values returned by allocated_capacity_bytes() and
334 // capacity_bytes_slow() are the same.
335 static void verify_capacity();
336 static void verify_used();
337 static void verify_metrics();
338 };
339
340 // Metaspace are deallocated when their class loader are GC'ed.
341 // This class implements a policy for inducing GC's to recover
342 // Metaspaces.
343
344 class MetaspaceGC : AllStatic {
345
346 // The current high-water-mark for inducing a GC. When
347 // the capacity of all space in the virtual lists reaches this value,
348 // a GC is induced and the value is increased. This should be changed
349 // to the space actually used for allocations to avoid affects of
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