Thu, 21 Nov 2013 19:00:57 -0800
8028767: PPC64: (part 121): smaller shared changes needed to build C2
Summary: smaller shared changes required to build the C2 compiler on PPC64.
Reviewed-by: kvn
1 /*
2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 */
24 #ifndef SHARE_VM_MEMORY_METASPACE_HPP
25 #define SHARE_VM_MEMORY_METASPACE_HPP
27 #include "memory/allocation.hpp"
28 #include "memory/memRegion.hpp"
29 #include "runtime/virtualspace.hpp"
30 #include "utilities/exceptions.hpp"
32 // Metaspace
33 //
34 // Metaspaces are Arenas for the VM's metadata.
35 // They are allocated one per class loader object, and one for the null
36 // bootstrap class loader
37 // Eventually for bootstrap loader we'll have a read-only section and read-write
38 // to write for DumpSharedSpaces and read for UseSharedSpaces
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 //
59 class ChunkManager;
60 class ClassLoaderData;
61 class Metablock;
62 class Metachunk;
63 class MetaWord;
64 class Mutex;
65 class outputStream;
66 class SpaceManager;
67 class VirtualSpaceList;
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.
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;
89 public:
90 enum MetadataType {
91 ClassType,
92 NonClassType,
93 MetadataTypeCount
94 };
95 enum MetaspaceType {
96 StandardMetaspaceType,
97 BootMetaspaceType,
98 ROMetaspaceType,
99 ReadWriteMetaspaceType,
100 AnonymousMetaspaceType,
101 ReflectionMetaspaceType
102 };
104 private:
105 void initialize(Mutex* lock, MetaspaceType type);
107 // Get the first chunk for a Metaspace. Used for
108 // special cases such as the boot class loader, reflection
109 // class loader and anonymous class loader.
110 Metachunk* get_initialization_chunk(MetadataType mdtype,
111 size_t chunk_word_size,
112 size_t chunk_bunch);
114 // Align up the word size to the allocation word size
115 static size_t align_word_size_up(size_t);
117 // Aligned size of the metaspace.
118 static size_t _compressed_class_space_size;
120 public:
121 static size_t compressed_class_space_size() {
122 return _compressed_class_space_size;
123 }
125 private:
126 static void set_compressed_class_space_size(size_t size) {
127 _compressed_class_space_size = size;
128 }
130 static size_t _first_chunk_word_size;
131 static size_t _first_class_chunk_word_size;
133 static size_t _commit_alignment;
134 static size_t _reserve_alignment;
136 SpaceManager* _vsm;
137 SpaceManager* vsm() const { return _vsm; }
139 SpaceManager* _class_vsm;
140 SpaceManager* class_vsm() const { return _class_vsm; }
142 // Allocate space for metadata of type mdtype. This is space
143 // within a Metachunk and is used by
144 // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
145 MetaWord* allocate(size_t word_size, MetadataType mdtype);
147 // Virtual Space lists for both classes and other metadata
148 static VirtualSpaceList* _space_list;
149 static VirtualSpaceList* _class_space_list;
151 static ChunkManager* _chunk_manager_metadata;
152 static ChunkManager* _chunk_manager_class;
154 public:
155 static VirtualSpaceList* space_list() { return _space_list; }
156 static VirtualSpaceList* class_space_list() { return _class_space_list; }
157 static VirtualSpaceList* get_space_list(MetadataType mdtype) {
158 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
159 return mdtype == ClassType ? class_space_list() : space_list();
160 }
162 static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
163 static ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
164 static ChunkManager* get_chunk_manager(MetadataType mdtype) {
165 assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
166 return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
167 }
169 private:
170 // This is used by DumpSharedSpaces only, where only _vsm is used. So we will
171 // maintain a single list for now.
172 void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
174 #ifdef _LP64
175 static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
177 // Returns true if can use CDS with metaspace allocated as specified address.
178 static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
180 static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
182 static void initialize_class_space(ReservedSpace rs);
183 #endif
185 class AllocRecord : public CHeapObj<mtClass> {
186 public:
187 AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
188 : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
189 AllocRecord *_next;
190 address _ptr;
191 MetaspaceObj::Type _type;
192 int _byte_size;
193 };
195 AllocRecord * _alloc_record_head;
196 AllocRecord * _alloc_record_tail;
198 size_t class_chunk_size(size_t word_size);
200 public:
202 Metaspace(Mutex* lock, MetaspaceType type);
203 ~Metaspace();
205 static void ergo_initialize();
206 static void global_initialize();
208 static size_t first_chunk_word_size() { return _first_chunk_word_size; }
209 static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
211 static size_t reserve_alignment() { return _reserve_alignment; }
212 static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
213 static size_t commit_alignment() { return _commit_alignment; }
214 static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
216 char* bottom() const;
217 size_t used_words_slow(MetadataType mdtype) const;
218 size_t free_words_slow(MetadataType mdtype) const;
219 size_t capacity_words_slow(MetadataType mdtype) const;
221 size_t used_bytes_slow(MetadataType mdtype) const;
222 size_t capacity_bytes_slow(MetadataType mdtype) const;
224 static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
225 bool read_only, MetaspaceObj::Type type, TRAPS);
226 void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
228 MetaWord* expand_and_allocate(size_t size,
229 MetadataType mdtype);
231 static bool contains(const void *ptr);
232 void dump(outputStream* const out) const;
234 // Free empty virtualspaces
235 static void purge(MetadataType mdtype);
236 static void purge();
238 static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
239 MetadataType mdtype, TRAPS);
241 void print_on(outputStream* st) const;
242 // Debugging support
243 void verify();
245 class AllocRecordClosure : public StackObj {
246 public:
247 virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
248 };
250 void iterate(AllocRecordClosure *closure);
252 // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
253 static bool using_class_space() {
254 return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
255 }
257 static bool is_class_space_allocation(MetadataType mdType) {
258 return mdType == ClassType && using_class_space();
259 }
261 };
263 class MetaspaceAux : AllStatic {
264 static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
266 // These methods iterate over the classloader data graph
267 // for the given Metaspace type. These are slow.
268 static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
269 static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
270 static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
271 static size_t capacity_bytes_slow();
273 // Running sum of space in all Metachunks that has been
274 // allocated to a Metaspace. This is used instead of
275 // iterating over all the classloaders. One for each
276 // type of Metadata
277 static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];
278 // Running sum of space in all Metachunks that have
279 // are being used for metadata. One for each
280 // type of Metadata.
281 static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];
283 public:
284 // Decrement and increment _allocated_capacity_words
285 static void dec_capacity(Metaspace::MetadataType type, size_t words);
286 static void inc_capacity(Metaspace::MetadataType type, size_t words);
288 // Decrement and increment _allocated_used_words
289 static void dec_used(Metaspace::MetadataType type, size_t words);
290 static void inc_used(Metaspace::MetadataType type, size_t words);
292 // Total of space allocated to metadata in all Metaspaces.
293 // This sums the space used in each Metachunk by
294 // iterating over the classloader data graph
295 static size_t used_bytes_slow() {
296 return used_bytes_slow(Metaspace::ClassType) +
297 used_bytes_slow(Metaspace::NonClassType);
298 }
300 // Used by MetaspaceCounters
301 static size_t free_chunks_total_words();
302 static size_t free_chunks_total_bytes();
303 static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
305 static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {
306 return _allocated_capacity_words[mdtype];
307 }
308 static size_t allocated_capacity_words() {
309 return allocated_capacity_words(Metaspace::NonClassType) +
310 allocated_capacity_words(Metaspace::ClassType);
311 }
312 static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {
313 return allocated_capacity_words(mdtype) * BytesPerWord;
314 }
315 static size_t allocated_capacity_bytes() {
316 return allocated_capacity_words() * BytesPerWord;
317 }
319 static size_t allocated_used_words(Metaspace::MetadataType mdtype) {
320 return _allocated_used_words[mdtype];
321 }
322 static size_t allocated_used_words() {
323 return allocated_used_words(Metaspace::NonClassType) +
324 allocated_used_words(Metaspace::ClassType);
325 }
326 static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {
327 return allocated_used_words(mdtype) * BytesPerWord;
328 }
329 static size_t allocated_used_bytes() {
330 return allocated_used_words() * BytesPerWord;
331 }
333 static size_t free_bytes();
334 static size_t free_bytes(Metaspace::MetadataType mdtype);
336 static size_t reserved_bytes(Metaspace::MetadataType mdtype);
337 static size_t reserved_bytes() {
338 return reserved_bytes(Metaspace::ClassType) +
339 reserved_bytes(Metaspace::NonClassType);
340 }
342 static size_t committed_bytes(Metaspace::MetadataType mdtype);
343 static size_t committed_bytes() {
344 return committed_bytes(Metaspace::ClassType) +
345 committed_bytes(Metaspace::NonClassType);
346 }
348 static size_t min_chunk_size_words();
349 static size_t min_chunk_size_bytes() {
350 return min_chunk_size_words() * BytesPerWord;
351 }
353 // Print change in used metadata.
354 static void print_metaspace_change(size_t prev_metadata_used);
355 static void print_on(outputStream * out);
356 static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
358 static void print_class_waste(outputStream* out);
359 static void print_waste(outputStream* out);
360 static void dump(outputStream* out);
361 static void verify_free_chunks();
362 // Checks that the values returned by allocated_capacity_bytes() and
363 // capacity_bytes_slow() are the same.
364 static void verify_capacity();
365 static void verify_used();
366 static void verify_metrics();
367 };
369 // Metaspace are deallocated when their class loader are GC'ed.
370 // This class implements a policy for inducing GC's to recover
371 // Metaspaces.
373 class MetaspaceGC : AllStatic {
375 // The current high-water-mark for inducing a GC.
376 // When committed memory of all metaspaces reaches this value,
377 // a GC is induced and the value is increased. Size is in bytes.
378 static volatile intptr_t _capacity_until_GC;
380 // For a CMS collection, signal that a concurrent collection should
381 // be started.
382 static bool _should_concurrent_collect;
384 static uint _shrink_factor;
386 static size_t shrink_factor() { return _shrink_factor; }
387 void set_shrink_factor(uint v) { _shrink_factor = v; }
389 public:
391 static void initialize() { _capacity_until_GC = MetaspaceSize; }
393 static size_t capacity_until_GC();
394 static size_t inc_capacity_until_GC(size_t v);
395 static size_t dec_capacity_until_GC(size_t v);
397 static bool should_concurrent_collect() { return _should_concurrent_collect; }
398 static void set_should_concurrent_collect(bool v) {
399 _should_concurrent_collect = v;
400 }
402 // The amount to increase the high-water-mark (_capacity_until_GC)
403 static size_t delta_capacity_until_GC(size_t bytes);
405 // Tells if we have can expand metaspace without hitting set limits.
406 static bool can_expand(size_t words, bool is_class);
408 // Returns amount that we can expand without hitting a GC,
409 // measured in words.
410 static size_t allowed_expansion();
412 // Calculate the new high-water mark at which to induce
413 // a GC.
414 static void compute_new_size();
415 };
417 #endif // SHARE_VM_MEMORY_METASPACE_HPP