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_VM_MEMORY_METASPACE_HPP
25 #define SHARE_VM_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 "utilities/exceptions.hpp"
32
33 // Metaspace
34 //
35 // Metaspaces are Arenas for the VM's metadata.
36 // They are allocated one per class loader object, and one for the null
37 // bootstrap class loader
38 // Eventually for bootstrap loader we'll have a read-only section and read-write
39 // to write for DumpSharedSpaces and read for UseSharedSpaces
40 //
41 // block X ---+ +-------------------+
42 // | | Virtualspace |
43 // | | |
44 // | | |
45 // | |-------------------|
46 // | || Chunk |
47 // | || |
48 // | ||---------- |
49 // +------>||| block 0 | |
50 // ||---------- |
51 // ||| block 1 | |
52 // ||---------- |
53 // || |
54 // |-------------------|
55 // | |
56 // | |
57 // +-------------------+
58 //
59
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 class Metaspace : public CHeapObj<mtClass> {
85 friend class VMStructs;
86 friend class SpaceManager;
87 friend class VM_CollectForMetadataAllocation;
88 friend class MetaspaceGC;
89 friend class MetaspaceAux;
90 friend class CollectorPolicy;
91
92 public:
93 enum MetadataType {
94 ClassType,
95 NonClassType,
96 MetadataTypeCount
97 };
98 enum MetaspaceType {
99 StandardMetaspaceType,
100 BootMetaspaceType,
101 ROMetaspaceType,
102 ReadWriteMetaspaceType,
103 AnonymousMetaspaceType,
104 ReflectionMetaspaceType
105 };
106
107 private:
108 static void verify_global_initialization();
109
110 void initialize(Mutex* lock, MetaspaceType type);
111
112 // Initialize the first chunk for a Metaspace. Used for
113 // special cases such as the boot class loader, reflection
114 // class loader and anonymous class loader.
115 void initialize_first_chunk(MetaspaceType type, MetadataType mdtype);
116 Metachunk* get_initialization_chunk(MetaspaceType type, MetadataType mdtype);
117
118 // Align up the word size to the allocation word size
119 static size_t align_word_size_up(size_t);
120
121 // Aligned size of the metaspace.
122 static size_t _compressed_class_space_size;
123
124 static size_t compressed_class_space_size() {
125 return _compressed_class_space_size;
126 }
127
128 static void set_compressed_class_space_size(size_t size) {
129 _compressed_class_space_size = size;
130 }
131
132 static size_t _first_chunk_word_size;
133 static size_t _first_class_chunk_word_size;
134
135 static size_t _commit_alignment;
136 static size_t _reserve_alignment;
137
138 SpaceManager* _vsm;
139 SpaceManager* vsm() const { return _vsm; }
140
141 SpaceManager* _class_vsm;
142 SpaceManager* class_vsm() const { return _class_vsm; }
143 SpaceManager* get_space_manager(MetadataType mdtype) {
144 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
145 return mdtype == ClassType ? class_vsm() : vsm();
146 }
147
148 // Allocate space for metadata of type mdtype. This is space
149 // within a Metachunk and is used by
150 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
151 MetaWord* allocate(size_t word_size, MetadataType mdtype);
152
153 MetaWord* expand_and_allocate(size_t size, MetadataType mdtype);
154
155 // Virtual Space lists for both classes and other metadata
156 static VirtualSpaceList* _space_list;
160 static ChunkManager* _chunk_manager_class;
161
162 static const MetaspaceTracer* _tracer;
163
164 public:
165 static VirtualSpaceList* space_list() { return _space_list; }
166 static VirtualSpaceList* class_space_list() { return _class_space_list; }
167 static VirtualSpaceList* get_space_list(MetadataType mdtype) {
168 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
169 return mdtype == ClassType ? class_space_list() : space_list();
170 }
171
172 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
173 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
174 static ChunkManager* get_chunk_manager(MetadataType mdtype) {
175 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
176 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
177 }
178
179 static const MetaspaceTracer* tracer() { return _tracer; }
180
181 private:
182 // These 2 methods are used by DumpSharedSpaces only, where only _vsm is used. So we will
183 // maintain a single list for now.
184 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
185 void record_deallocation(void* ptr, size_t word_size);
186
187 #ifdef _LP64
188 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
189
190 // Returns true if can use CDS with metaspace allocated as specified address.
191 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
192
193 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
194
195 static void initialize_class_space(ReservedSpace rs);
196 #endif
197
198 class AllocRecord : public CHeapObj<mtClass> {
199 public:
200 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
201 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
202 AllocRecord *_next;
203 address _ptr;
204 MetaspaceObj::Type _type;
205 int _byte_size;
206 };
207
208 AllocRecord * _alloc_record_head;
209 AllocRecord * _alloc_record_tail;
210
211 size_t class_chunk_size(size_t word_size);
212
213 public:
214
215 Metaspace(Mutex* lock, MetaspaceType type);
216 ~Metaspace();
217
218 static void ergo_initialize();
219 static void global_initialize();
220 static void post_initialize();
221
222 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
223 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
224
225 static size_t reserve_alignment() { return _reserve_alignment; }
226 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
227 static size_t commit_alignment() { return _commit_alignment; }
228 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
229
230 char* bottom() const;
231 size_t used_words_slow(MetadataType mdtype) const;
232 size_t free_words_slow(MetadataType mdtype) const;
233 size_t capacity_words_slow(MetadataType mdtype) const;
234
235 size_t used_bytes_slow(MetadataType mdtype) const;
236 size_t capacity_bytes_slow(MetadataType mdtype) const;
237
238 size_t allocated_blocks_bytes() const;
239 size_t allocated_chunks_bytes() const;
240
241 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
242 bool read_only, MetaspaceObj::Type type, TRAPS);
243 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
244
245 static bool contains(const void* ptr);
246 static bool contains_non_shared(const void* ptr);
247
248 void dump(outputStream* const out) const;
249
250 // Free empty virtualspaces
251 static void purge(MetadataType mdtype);
252 static void purge();
253
254 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
255 MetaspaceObj::Type type, MetadataType mdtype, TRAPS);
256
257 static const char* metadata_type_name(Metaspace::MetadataType mdtype);
258
259 void print_on(outputStream* st) const;
260 // Debugging support
261 void verify();
262
263 static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
264
265 class AllocRecordClosure : public StackObj {
266 public:
267 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
268 };
269
270 void iterate(AllocRecordClosure *closure);
271
272 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
273 static bool using_class_space() {
274 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
275 }
276
277 static bool is_class_space_allocation(MetadataType mdType) {
278 return mdType == ClassType && using_class_space();
279 }
280
281 };
282
283 class MetaspaceAux : AllStatic {
284 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
285
286 // These methods iterate over the classloader data graph
287 // for the given Metaspace type. These are slow.
288 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
289 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
290 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
291 static size_t capacity_bytes_slow();
292
293 // Running sum of space in all Metachunks that has been
294 // allocated to a Metaspace. This is used instead of
|
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_VM_MEMORY_METASPACE_HPP
25 #define SHARE_VM_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 "utilities/exceptions.hpp"
32
33 // Metaspace
34 //
35 // Metaspaces are Arenas for the VM's metadata.
36 // They are allocated one per class loader object, and one for the null
37 // bootstrap class loader
38 //
39 // block X ---+ +-------------------+
40 // | | Virtualspace |
41 // | | |
42 // | | |
43 // | |-------------------|
44 // | || Chunk |
45 // | || |
46 // | ||---------- |
47 // +------>||| block 0 | |
48 // ||---------- |
49 // ||| block 1 | |
50 // ||---------- |
51 // || |
52 // |-------------------|
53 // | |
54 // | |
55 // +-------------------+
56 //
57
68
69 // Metaspaces each have a SpaceManager and allocations
70 // are done by the SpaceManager. Allocations are done
71 // out of the current Metachunk. When the current Metachunk
72 // is exhausted, the SpaceManager gets a new one from
73 // the current VirtualSpace. When the VirtualSpace is exhausted
74 // the SpaceManager gets a new one. The SpaceManager
75 // also manages freelists of available Chunks.
76 //
77 // Currently the space manager maintains the list of
78 // virtual spaces and the list of chunks in use. Its
79 // allocate() method returns a block for use as a
80 // quantum of metadata.
81
82 class Metaspace : public CHeapObj<mtClass> {
83 friend class VMStructs;
84 friend class SpaceManager;
85 friend class VM_CollectForMetadataAllocation;
86 friend class MetaspaceGC;
87 friend class MetaspaceAux;
88 friend class MetaspaceShared;
89 friend class CollectorPolicy;
90
91 public:
92 enum MetadataType {
93 ClassType,
94 NonClassType,
95 MetadataTypeCount
96 };
97 enum MetaspaceType {
98 StandardMetaspaceType,
99 BootMetaspaceType,
100 AnonymousMetaspaceType,
101 ReflectionMetaspaceType
102 };
103
104 private:
105 static void verify_global_initialization();
106
107 void initialize(Mutex* lock, MetaspaceType type);
108
109 // Initialize the first chunk for a Metaspace. Used for
110 // special cases such as the boot class loader, reflection
111 // class loader and anonymous class loader.
112 void initialize_first_chunk(MetaspaceType type, MetadataType mdtype);
113 Metachunk* get_initialization_chunk(MetaspaceType type, MetadataType mdtype);
114
115 // Align up the word size to the allocation word size
116 static size_t align_word_size_up(size_t);
117
118 // Aligned size of the metaspace.
119 static size_t _compressed_class_space_size;
120
121 static size_t compressed_class_space_size() {
122 return _compressed_class_space_size;
123 }
124
125 static void set_compressed_class_space_size(size_t size) {
126 _compressed_class_space_size = size;
127 }
128
129 static size_t _first_chunk_word_size;
130 static size_t _first_class_chunk_word_size;
131
132 static size_t _commit_alignment;
133 static size_t _reserve_alignment;
134 DEBUG_ONLY(static bool _frozen;)
135
136 SpaceManager* _vsm;
137 SpaceManager* vsm() const { return _vsm; }
138
139 SpaceManager* _class_vsm;
140 SpaceManager* class_vsm() const { return _class_vsm; }
141 SpaceManager* get_space_manager(MetadataType mdtype) {
142 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
143 return mdtype == ClassType ? class_vsm() : vsm();
144 }
145
146 // Allocate space for metadata of type mdtype. This is space
147 // within a Metachunk and is used by
148 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
149 MetaWord* allocate(size_t word_size, MetadataType mdtype);
150
151 MetaWord* expand_and_allocate(size_t size, MetadataType mdtype);
152
153 // Virtual Space lists for both classes and other metadata
154 static VirtualSpaceList* _space_list;
158 static ChunkManager* _chunk_manager_class;
159
160 static const MetaspaceTracer* _tracer;
161
162 public:
163 static VirtualSpaceList* space_list() { return _space_list; }
164 static VirtualSpaceList* class_space_list() { return _class_space_list; }
165 static VirtualSpaceList* get_space_list(MetadataType mdtype) {
166 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
167 return mdtype == ClassType ? class_space_list() : space_list();
168 }
169
170 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
171 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
172 static ChunkManager* get_chunk_manager(MetadataType mdtype) {
173 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
174 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
175 }
176
177 static const MetaspaceTracer* tracer() { return _tracer; }
178 static void freeze() {
179 assert(DumpSharedSpaces, "sanity");
180 DEBUG_ONLY(_frozen = true;)
181 }
182 private:
183
184 #ifdef _LP64
185 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
186
187 // Returns true if can use CDS with metaspace allocated as specified address.
188 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
189
190 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
191
192 static void initialize_class_space(ReservedSpace rs);
193 #endif
194 size_t class_chunk_size(size_t word_size);
195
196 public:
197
198 Metaspace(Mutex* lock, MetaspaceType type);
199 ~Metaspace();
200
201 static void ergo_initialize();
202 static void global_initialize();
203 static void post_initialize();
204
205 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
206 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
207
208 static size_t reserve_alignment() { return _reserve_alignment; }
209 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
210 static size_t commit_alignment() { return _commit_alignment; }
211 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
212
213 size_t used_words_slow(MetadataType mdtype) const;
214 size_t free_words_slow(MetadataType mdtype) const;
215 size_t capacity_words_slow(MetadataType mdtype) const;
216
217 size_t used_bytes_slow(MetadataType mdtype) const;
218 size_t capacity_bytes_slow(MetadataType mdtype) const;
219
220 size_t allocated_blocks_bytes() const;
221 size_t allocated_chunks_bytes() const;
222
223 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
224 MetaspaceObj::Type type, TRAPS);
225 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
226
227 static bool contains(const void* ptr);
228 static bool contains_non_shared(const void* ptr);
229
230 void dump(outputStream* const out) const;
231
232 // Free empty virtualspaces
233 static void purge(MetadataType mdtype);
234 static void purge();
235
236 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
237 MetaspaceObj::Type type, MetadataType mdtype, TRAPS);
238
239 static const char* metadata_type_name(Metaspace::MetadataType mdtype);
240
241 void print_on(outputStream* st) const;
242 // Debugging support
243 void verify();
244
245 static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
246
247 // Return TRUE only if UseCompressedClassPointers is True.
248 static bool using_class_space() {
249 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers);
250 }
251
252 static bool is_class_space_allocation(MetadataType mdType) {
253 return mdType == ClassType && using_class_space();
254 }
255
256 };
257
258 class MetaspaceAux : AllStatic {
259 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
260
261 // These methods iterate over the classloader data graph
262 // for the given Metaspace type. These are slow.
263 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
264 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
265 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
266 static size_t capacity_bytes_slow();
267
268 // Running sum of space in all Metachunks that has been
269 // allocated to a Metaspace. This is used instead of
|