Mercurial > hg > graal-compiler
annotate src/share/vm/gc_interface/collectedHeap.hpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 20 Sep 2010 14:38:38 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // A "CollectedHeap" is an implementation of a java heap for HotSpot. This | |
| 26 // is an abstract class: there may be many different kinds of heaps. This | |
| 27 // class defines the functions that a heap must implement, and contains | |
| 28 // infrastructure common to all heaps. | |
| 29 | |
| 30 class BarrierSet; | |
| 31 class ThreadClosure; | |
| 32 class AdaptiveSizePolicy; | |
| 33 class Thread; | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1166
diff
changeset
|
34 class CollectorPolicy; |
| 0 | 35 |
| 36 // | |
| 37 // CollectedHeap | |
| 38 // SharedHeap | |
| 39 // GenCollectedHeap | |
| 40 // G1CollectedHeap | |
| 41 // ParallelScavengeHeap | |
| 42 // | |
| 43 class CollectedHeap : public CHeapObj { | |
| 44 friend class VMStructs; | |
| 45 friend class IsGCActiveMark; // Block structured external access to _is_gc_active | |
|
542
9a25e0c45327
6792421: assert(_bitMap->isMarked(addr+size-1),inconsistent Printezis mark)
jmasa
parents:
517
diff
changeset
|
46 friend class constantPoolCacheKlass; // allocate() method inserts is_conc_safe |
| 0 | 47 |
| 48 #ifdef ASSERT | |
| 49 static int _fire_out_of_memory_count; | |
| 50 #endif | |
| 51 | |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
52 // Used for filler objects (static, but initialized in ctor). |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
53 static size_t _filler_array_max_size; |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
54 |
| 1166 | 55 // Used in support of ReduceInitialCardMarks; only consulted if COMPILER2 is being used |
| 56 bool _defer_initial_card_mark; | |
| 57 | |
| 0 | 58 protected: |
| 59 MemRegion _reserved; | |
| 60 BarrierSet* _barrier_set; | |
| 61 bool _is_gc_active; | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
62 int _n_par_threads; |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
63 |
| 0 | 64 unsigned int _total_collections; // ... started |
| 65 unsigned int _total_full_collections; // ... started | |
| 66 NOT_PRODUCT(volatile size_t _promotion_failure_alot_count;) | |
| 67 NOT_PRODUCT(volatile size_t _promotion_failure_alot_gc_number;) | |
| 68 | |
| 69 // Reason for current garbage collection. Should be set to | |
| 70 // a value reflecting no collection between collections. | |
| 71 GCCause::Cause _gc_cause; | |
| 72 GCCause::Cause _gc_lastcause; | |
| 73 PerfStringVariable* _perf_gc_cause; | |
| 74 PerfStringVariable* _perf_gc_lastcause; | |
| 75 | |
| 76 // Constructor | |
| 77 CollectedHeap(); | |
| 78 | |
| 1166 | 79 // Do common initializations that must follow instance construction, |
| 80 // for example, those needing virtual calls. | |
| 81 // This code could perhaps be moved into initialize() but would | |
| 82 // be slightly more awkward because we want the latter to be a | |
| 83 // pure virtual. | |
| 84 void pre_initialize(); | |
| 85 | |
| 0 | 86 // Create a new tlab |
| 87 virtual HeapWord* allocate_new_tlab(size_t size); | |
| 88 | |
| 89 // Accumulate statistics on all tlabs. | |
| 90 virtual void accumulate_statistics_all_tlabs(); | |
| 91 | |
| 92 // Reinitialize tlabs before resuming mutators. | |
| 93 virtual void resize_all_tlabs(); | |
| 94 | |
| 95 protected: | |
| 96 // Allocate from the current thread's TLAB, with broken-out slow path. | |
| 97 inline static HeapWord* allocate_from_tlab(Thread* thread, size_t size); | |
| 98 static HeapWord* allocate_from_tlab_slow(Thread* thread, size_t size); | |
| 99 | |
| 100 // Allocate an uninitialized block of the given size, or returns NULL if | |
| 101 // this is impossible. | |
| 102 inline static HeapWord* common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS); | |
| 103 | |
| 104 // Like allocate_init, but the block returned by a successful allocation | |
| 105 // is guaranteed initialized to zeros. | |
| 106 inline static HeapWord* common_mem_allocate_init(size_t size, bool is_noref, TRAPS); | |
| 107 | |
| 108 // Same as common_mem version, except memory is allocated in the permanent area | |
| 109 // If there is no permanent area, revert to common_mem_allocate_noinit | |
| 110 inline static HeapWord* common_permanent_mem_allocate_noinit(size_t size, TRAPS); | |
| 111 | |
| 112 // Same as common_mem version, except memory is allocated in the permanent area | |
| 113 // If there is no permanent area, revert to common_mem_allocate_init | |
| 114 inline static HeapWord* common_permanent_mem_allocate_init(size_t size, TRAPS); | |
| 115 | |
| 116 // Helper functions for (VM) allocation. | |
| 117 inline static void post_allocation_setup_common(KlassHandle klass, | |
| 118 HeapWord* obj, size_t size); | |
| 119 inline static void post_allocation_setup_no_klass_install(KlassHandle klass, | |
| 120 HeapWord* objPtr, | |
| 121 size_t size); | |
| 122 | |
| 123 inline static void post_allocation_setup_obj(KlassHandle klass, | |
| 124 HeapWord* obj, size_t size); | |
| 125 | |
| 126 inline static void post_allocation_setup_array(KlassHandle klass, | |
| 127 HeapWord* obj, size_t size, | |
| 128 int length); | |
| 129 | |
| 130 // Clears an allocated object. | |
| 131 inline static void init_obj(HeapWord* obj, size_t size); | |
| 132 | |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
133 // Filler object utilities. |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
134 static inline size_t filler_array_hdr_size(); |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
135 static inline size_t filler_array_min_size(); |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
136 static inline size_t filler_array_max_size(); |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
137 |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
138 DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);) |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
139 DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words, bool zap = true);) |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
140 |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
141 // Fill with a single array; caller must ensure filler_array_min_size() <= |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
142 // words <= filler_array_max_size(). |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
143 static inline void fill_with_array(HeapWord* start, size_t words, bool zap = true); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
144 |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
145 // Fill with a single object (either an int array or a java.lang.Object). |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
146 static inline void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
147 |
| 0 | 148 // Verification functions |
| 149 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 150 PRODUCT_RETURN; | |
| 151 virtual void check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
| 152 PRODUCT_RETURN; | |
|
542
9a25e0c45327
6792421: assert(_bitMap->isMarked(addr+size-1),inconsistent Printezis mark)
jmasa
parents:
517
diff
changeset
|
153 debug_only(static void check_for_valid_allocation_state();) |
| 0 | 154 |
| 155 public: | |
| 156 enum Name { | |
| 157 Abstract, | |
| 158 SharedHeap, | |
| 159 GenCollectedHeap, | |
| 160 ParallelScavengeHeap, | |
| 161 G1CollectedHeap | |
| 162 }; | |
| 163 | |
| 164 virtual CollectedHeap::Name kind() const { return CollectedHeap::Abstract; } | |
| 165 | |
| 166 /** | |
| 167 * Returns JNI error code JNI_ENOMEM if memory could not be allocated, | |
| 168 * and JNI_OK on success. | |
| 169 */ | |
| 170 virtual jint initialize() = 0; | |
| 171 | |
| 172 // In many heaps, there will be a need to perform some initialization activities | |
| 173 // after the Universe is fully formed, but before general heap allocation is allowed. | |
| 174 // This is the correct place to place such initialization methods. | |
| 175 virtual void post_initialize() = 0; | |
| 176 | |
| 177 MemRegion reserved_region() const { return _reserved; } | |
|
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
178 address base() const { return (address)reserved_region().start(); } |
| 0 | 179 |
| 180 // Future cleanup here. The following functions should specify bytes or | |
| 181 // heapwords as part of their signature. | |
| 182 virtual size_t capacity() const = 0; | |
| 183 virtual size_t used() const = 0; | |
| 184 | |
| 185 // Return "true" if the part of the heap that allocates Java | |
| 186 // objects has reached the maximal committed limit that it can | |
| 187 // reach, without a garbage collection. | |
| 188 virtual bool is_maximal_no_gc() const = 0; | |
| 189 | |
| 190 virtual size_t permanent_capacity() const = 0; | |
| 191 virtual size_t permanent_used() const = 0; | |
| 192 | |
| 193 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of | |
| 194 // memory that the vm could make available for storing 'normal' java objects. | |
| 195 // This is based on the reserved address space, but should not include space | |
| 196 // that the vm uses internally for bookkeeping or temporary storage (e.g., | |
| 197 // perm gen space or, in the case of the young gen, one of the survivor | |
| 198 // spaces). | |
| 199 virtual size_t max_capacity() const = 0; | |
| 200 | |
| 201 // Returns "TRUE" if "p" points into the reserved area of the heap. | |
| 202 bool is_in_reserved(const void* p) const { | |
| 203 return _reserved.contains(p); | |
| 204 } | |
| 205 | |
| 206 bool is_in_reserved_or_null(const void* p) const { | |
| 207 return p == NULL || is_in_reserved(p); | |
| 208 } | |
| 209 | |
| 210 // Returns "TRUE" if "p" points to the head of an allocated object in the | |
| 211 // heap. Since this method can be expensive in general, we restrict its | |
| 212 // use to assertion checking only. | |
| 213 virtual bool is_in(const void* p) const = 0; | |
| 214 | |
| 215 bool is_in_or_null(const void* p) const { | |
| 216 return p == NULL || is_in(p); | |
| 217 } | |
| 218 | |
| 219 // Let's define some terms: a "closed" subset of a heap is one that | |
| 220 // | |
| 221 // 1) contains all currently-allocated objects, and | |
| 222 // | |
| 223 // 2) is closed under reference: no object in the closed subset | |
| 224 // references one outside the closed subset. | |
| 225 // | |
| 226 // Membership in a heap's closed subset is useful for assertions. | |
| 227 // Clearly, the entire heap is a closed subset, so the default | |
| 228 // implementation is to use "is_in_reserved". But this may not be too | |
| 229 // liberal to perform useful checking. Also, the "is_in" predicate | |
| 230 // defines a closed subset, but may be too expensive, since "is_in" | |
| 231 // verifies that its argument points to an object head. The | |
| 232 // "closed_subset" method allows a heap to define an intermediate | |
| 233 // predicate, allowing more precise checking than "is_in_reserved" at | |
| 234 // lower cost than "is_in." | |
| 235 | |
| 236 // One important case is a heap composed of disjoint contiguous spaces, | |
| 237 // such as the Garbage-First collector. Such heaps have a convenient | |
| 238 // closed subset consisting of the allocated portions of those | |
| 239 // contiguous spaces. | |
| 240 | |
| 241 // Return "TRUE" iff the given pointer points into the heap's defined | |
| 242 // closed subset (which defaults to the entire heap). | |
| 243 virtual bool is_in_closed_subset(const void* p) const { | |
| 244 return is_in_reserved(p); | |
| 245 } | |
| 246 | |
| 247 bool is_in_closed_subset_or_null(const void* p) const { | |
| 248 return p == NULL || is_in_closed_subset(p); | |
| 249 } | |
| 250 | |
| 941 | 251 // XXX is_permanent() and is_in_permanent() should be better named |
| 252 // to distinguish one from the other. | |
| 253 | |
| 0 | 254 // Returns "TRUE" if "p" is allocated as "permanent" data. |
| 255 // If the heap does not use "permanent" data, returns the same | |
| 256 // value is_in_reserved() would return. | |
| 257 // NOTE: this actually returns true if "p" is in reserved space | |
| 258 // for the space not that it is actually allocated (i.e. in committed | |
| 259 // space). If you need the more conservative answer use is_permanent(). | |
| 260 virtual bool is_in_permanent(const void *p) const = 0; | |
| 261 | |
| 941 | 262 bool is_in_permanent_or_null(const void *p) const { |
| 263 return p == NULL || is_in_permanent(p); | |
| 264 } | |
| 265 | |
| 0 | 266 // Returns "TRUE" if "p" is in the committed area of "permanent" data. |
| 267 // If the heap does not use "permanent" data, returns the same | |
| 268 // value is_in() would return. | |
| 269 virtual bool is_permanent(const void *p) const = 0; | |
| 270 | |
| 941 | 271 bool is_permanent_or_null(const void *p) const { |
| 272 return p == NULL || is_permanent(p); | |
| 0 | 273 } |
| 274 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
275 // An object is scavengable if its location may move during a scavenge. |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
276 // (A scavenge is a GC which is not a full GC.) |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
277 // Currently, this just means it is not perm (and not null). |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
278 // This could change if we rethink what's in perm-gen. |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
279 bool is_scavengable(const void *p) const { |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
280 return !is_in_permanent_or_null(p); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
281 } |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
845
diff
changeset
|
282 |
| 0 | 283 // Returns "TRUE" if "p" is a method oop in the |
| 284 // current heap, with high probability. This predicate | |
| 285 // is not stable, in general. | |
| 286 bool is_valid_method(oop p) const; | |
| 287 | |
| 288 void set_gc_cause(GCCause::Cause v) { | |
| 289 if (UsePerfData) { | |
| 290 _gc_lastcause = _gc_cause; | |
| 291 _perf_gc_lastcause->set_value(GCCause::to_string(_gc_lastcause)); | |
| 292 _perf_gc_cause->set_value(GCCause::to_string(v)); | |
| 293 } | |
| 294 _gc_cause = v; | |
| 295 } | |
| 296 GCCause::Cause gc_cause() { return _gc_cause; } | |
| 297 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
298 // Number of threads currently working on GC tasks. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
299 int n_par_threads() { return _n_par_threads; } |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
300 |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
301 // May be overridden to set additional parallelism. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
302 virtual void set_par_threads(int t) { _n_par_threads = t; }; |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
303 |
| 0 | 304 // Preload classes into the shared portion of the heap, and then dump |
| 305 // that data to a file so that it can be loaded directly by another | |
| 306 // VM (then terminate). | |
| 307 virtual void preload_and_dump(TRAPS) { ShouldNotReachHere(); } | |
| 308 | |
| 309 // General obj/array allocation facilities. | |
| 310 inline static oop obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 311 inline static oop array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
| 312 inline static oop large_typearray_allocate(KlassHandle klass, int size, int length, TRAPS); | |
| 313 | |
| 314 // Special obj/array allocation facilities. | |
| 315 // Some heaps may want to manage "permanent" data uniquely. These default | |
| 316 // to the general routines if the heap does not support such handling. | |
| 317 inline static oop permanent_obj_allocate(KlassHandle klass, int size, TRAPS); | |
| 318 // permanent_obj_allocate_no_klass_install() does not do the installation of | |
| 319 // the klass pointer in the newly created object (as permanent_obj_allocate() | |
| 320 // above does). This allows for a delay in the installation of the klass | |
| 321 // pointer that is needed during the create of klassKlass's. The | |
| 322 // method post_allocation_install_obj_klass() is used to install the | |
| 323 // klass pointer. | |
| 324 inline static oop permanent_obj_allocate_no_klass_install(KlassHandle klass, | |
| 325 int size, | |
| 326 TRAPS); | |
| 327 inline static void post_allocation_install_obj_klass(KlassHandle klass, | |
| 328 oop obj, | |
| 329 int size); | |
| 330 inline static oop permanent_array_allocate(KlassHandle klass, int size, int length, TRAPS); | |
| 331 | |
| 332 // Raw memory allocation facilities | |
| 333 // The obj and array allocate methods are covers for these methods. | |
| 334 // The permanent allocation method should default to mem_allocate if | |
| 335 // permanent memory isn't supported. | |
| 336 virtual HeapWord* mem_allocate(size_t size, | |
| 337 bool is_noref, | |
| 338 bool is_tlab, | |
| 339 bool* gc_overhead_limit_was_exceeded) = 0; | |
| 340 virtual HeapWord* permanent_mem_allocate(size_t size) = 0; | |
| 341 | |
| 342 // The boundary between a "large" and "small" array of primitives, in words. | |
| 343 virtual size_t large_typearray_limit() = 0; | |
| 344 | |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
345 // Utilities for turning raw memory into filler objects. |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
346 // |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
347 // min_fill_size() is the smallest region that can be filled. |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
348 // fill_with_objects() can fill arbitrary-sized regions of the heap using |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
349 // multiple objects. fill_with_object() is for regions known to be smaller |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
350 // than the largest array of integers; it uses a single object to fill the |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
351 // region and has slightly less overhead. |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
352 static size_t min_fill_size() { |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
353 return size_t(align_object_size(oopDesc::header_size())); |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
354 } |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
355 |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
356 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
357 |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
358 static void fill_with_object(HeapWord* start, size_t words, bool zap = true); |
|
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
359 static void fill_with_object(MemRegion region, bool zap = true) { |
|
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
360 fill_with_object(region.start(), region.word_size(), zap); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
361 } |
|
1165
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
362 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { |
|
2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
johnc
parents:
1027
diff
changeset
|
363 fill_with_object(start, pointer_delta(end, start), zap); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
364 } |
|
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
356
diff
changeset
|
365 |
| 0 | 366 // Some heaps may offer a contiguous region for shared non-blocking |
| 367 // allocation, via inlined code (by exporting the address of the top and | |
| 368 // end fields defining the extent of the contiguous allocation region.) | |
| 369 | |
| 370 // This function returns "true" iff the heap supports this kind of | |
| 371 // allocation. (Default is "no".) | |
| 372 virtual bool supports_inline_contig_alloc() const { | |
| 373 return false; | |
| 374 } | |
| 375 // These functions return the addresses of the fields that define the | |
| 376 // boundaries of the contiguous allocation area. (These fields should be | |
| 377 // physically near to one another.) | |
| 378 virtual HeapWord** top_addr() const { | |
| 379 guarantee(false, "inline contiguous allocation not supported"); | |
| 380 return NULL; | |
| 381 } | |
| 382 virtual HeapWord** end_addr() const { | |
| 383 guarantee(false, "inline contiguous allocation not supported"); | |
| 384 return NULL; | |
| 385 } | |
| 386 | |
| 387 // Some heaps may be in an unparseable state at certain times between | |
| 388 // collections. This may be necessary for efficient implementation of | |
| 389 // certain allocation-related activities. Calling this function before | |
| 390 // attempting to parse a heap ensures that the heap is in a parsable | |
| 391 // state (provided other concurrent activity does not introduce | |
| 392 // unparsability). It is normally expected, therefore, that this | |
| 393 // method is invoked with the world stopped. | |
| 394 // NOTE: if you override this method, make sure you call | |
| 395 // super::ensure_parsability so that the non-generational | |
| 396 // part of the work gets done. See implementation of | |
| 397 // CollectedHeap::ensure_parsability and, for instance, | |
| 398 // that of GenCollectedHeap::ensure_parsability(). | |
| 399 // The argument "retire_tlabs" controls whether existing TLABs | |
| 400 // are merely filled or also retired, thus preventing further | |
| 401 // allocation from them and necessitating allocation of new TLABs. | |
| 402 virtual void ensure_parsability(bool retire_tlabs); | |
| 403 | |
| 404 // Return an estimate of the maximum allocation that could be performed | |
| 405 // without triggering any collection or expansion activity. In a | |
| 406 // generational collector, for example, this is probably the largest | |
| 407 // allocation that could be supported (without expansion) in the youngest | |
| 408 // generation. It is "unsafe" because no locks are taken; the result | |
| 409 // should be treated as an approximation, not a guarantee, for use in | |
| 410 // heuristic resizing decisions. | |
| 411 virtual size_t unsafe_max_alloc() = 0; | |
| 412 | |
| 413 // Section on thread-local allocation buffers (TLABs) | |
| 414 // If the heap supports thread-local allocation buffers, it should override | |
| 415 // the following methods: | |
| 416 // Returns "true" iff the heap supports thread-local allocation buffers. | |
| 417 // The default is "no". | |
| 418 virtual bool supports_tlab_allocation() const { | |
| 419 return false; | |
| 420 } | |
| 421 // The amount of space available for thread-local allocation buffers. | |
| 422 virtual size_t tlab_capacity(Thread *thr) const { | |
| 423 guarantee(false, "thread-local allocation buffers not supported"); | |
| 424 return 0; | |
| 425 } | |
| 426 // An estimate of the maximum allocation that could be performed | |
| 427 // for thread-local allocation buffers without triggering any | |
| 428 // collection or expansion activity. | |
| 429 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { | |
| 430 guarantee(false, "thread-local allocation buffers not supported"); | |
| 431 return 0; | |
| 432 } | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
433 |
| 0 | 434 // Can a compiler initialize a new object without store barriers? |
| 435 // This permission only extends from the creation of a new object | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
436 // via a TLAB up to the first subsequent safepoint. If such permission |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
437 // is granted for this heap type, the compiler promises to call |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
438 // defer_store_barrier() below on any slow path allocation of |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
439 // a new object for which such initializing store barriers will |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
440 // have been elided. |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
441 virtual bool can_elide_tlab_store_barriers() const = 0; |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
442 |
| 0 | 443 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 444 // there is probably a corresponding slow path which can produce | |
| 445 // an object allocated anywhere. The compiler's runtime support | |
| 446 // promises to call this function on such a slow-path-allocated | |
| 447 // object before performing initializations that have elided | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
448 // store barriers. Returns new_obj, or maybe a safer copy thereof. |
| 1166 | 449 virtual oop new_store_pre_barrier(JavaThread* thread, oop new_obj); |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
450 |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
451 // Answers whether an initializing store to a new object currently |
| 1166 | 452 // allocated at the given address doesn't need a store |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
453 // barrier. Returns "true" if it doesn't need an initializing |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
454 // store barrier; answers "false" if it does. |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
455 virtual bool can_elide_initializing_store_barrier(oop new_obj) = 0; |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
456 |
| 1166 | 457 // If a compiler is eliding store barriers for TLAB-allocated objects, |
| 458 // we will be informed of a slow-path allocation by a call | |
| 459 // to new_store_pre_barrier() above. Such a call precedes the | |
| 460 // initialization of the object itself, and no post-store-barriers will | |
| 461 // be issued. Some heap types require that the barrier strictly follows | |
| 462 // the initializing stores. (This is currently implemented by deferring the | |
| 463 // barrier until the next slow-path allocation or gc-related safepoint.) | |
| 464 // This interface answers whether a particular heap type needs the card | |
| 465 // mark to be thus strictly sequenced after the stores. | |
| 466 virtual bool card_mark_must_follow_store() const = 0; | |
| 467 | |
|
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
468 // If the CollectedHeap was asked to defer a store barrier above, |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
469 // this informs it to flush such a deferred store barrier to the |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
470 // remembered set. |
|
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
993
diff
changeset
|
471 virtual void flush_deferred_store_barrier(JavaThread* thread); |
| 0 | 472 |
| 473 // Can a compiler elide a store barrier when it writes | |
| 474 // a permanent oop into the heap? Applies when the compiler | |
| 475 // is storing x to the heap, where x->is_perm() is true. | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
476 virtual bool can_elide_permanent_oop_store_barriers() const = 0; |
| 0 | 477 |
| 478 // Does this heap support heap inspection (+PrintClassHistogram?) | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
479 virtual bool supports_heap_inspection() const = 0; |
| 0 | 480 |
| 481 // Perform a collection of the heap; intended for use in implementing | |
| 482 // "System.gc". This probably implies as full a collection as the | |
| 483 // "CollectedHeap" supports. | |
| 484 virtual void collect(GCCause::Cause cause) = 0; | |
| 485 | |
| 486 // This interface assumes that it's being called by the | |
| 487 // vm thread. It collects the heap assuming that the | |
| 488 // heap lock is already held and that we are executing in | |
| 489 // the context of the vm thread. | |
| 490 virtual void collect_as_vm_thread(GCCause::Cause cause) = 0; | |
| 491 | |
| 492 // Returns the barrier set for this heap | |
| 493 BarrierSet* barrier_set() { return _barrier_set; } | |
| 494 | |
| 495 // Returns "true" iff there is a stop-world GC in progress. (I assume | |
| 496 // that it should answer "false" for the concurrent part of a concurrent | |
| 497 // collector -- dld). | |
| 498 bool is_gc_active() const { return _is_gc_active; } | |
| 499 | |
| 500 // Total number of GC collections (started) | |
| 501 unsigned int total_collections() const { return _total_collections; } | |
| 502 unsigned int total_full_collections() const { return _total_full_collections;} | |
| 503 | |
| 504 // Increment total number of GC collections (started) | |
| 505 // Should be protected but used by PSMarkSweep - cleanup for 1.4.2 | |
| 506 void increment_total_collections(bool full = false) { | |
| 507 _total_collections++; | |
| 508 if (full) { | |
| 509 increment_total_full_collections(); | |
| 510 } | |
| 511 } | |
| 512 | |
| 513 void increment_total_full_collections() { _total_full_collections++; } | |
| 514 | |
| 515 // Return the AdaptiveSizePolicy for the heap. | |
| 516 virtual AdaptiveSizePolicy* size_policy() = 0; | |
| 517 | |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1166
diff
changeset
|
518 // Return the CollectorPolicy for the heap |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1166
diff
changeset
|
519 virtual CollectorPolicy* collector_policy() const = 0; |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1166
diff
changeset
|
520 |
| 0 | 521 // Iterate over all the ref-containing fields of all objects, calling |
| 522 // "cl.do_oop" on each. This includes objects in permanent memory. | |
| 523 virtual void oop_iterate(OopClosure* cl) = 0; | |
| 524 | |
| 525 // Iterate over all objects, calling "cl.do_object" on each. | |
| 526 // This includes objects in permanent memory. | |
| 527 virtual void object_iterate(ObjectClosure* cl) = 0; | |
| 528 | |
|
517
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
481
diff
changeset
|
529 // Similar to object_iterate() except iterates only |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
481
diff
changeset
|
530 // over live objects. |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
481
diff
changeset
|
531 virtual void safe_object_iterate(ObjectClosure* cl) = 0; |
|
e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
481
diff
changeset
|
532 |
| 0 | 533 // Behaves the same as oop_iterate, except only traverses |
| 534 // interior pointers contained in permanent memory. If there | |
| 535 // is no permanent memory, does nothing. | |
| 536 virtual void permanent_oop_iterate(OopClosure* cl) = 0; | |
| 537 | |
| 538 // Behaves the same as object_iterate, except only traverses | |
| 539 // object contained in permanent memory. If there is no | |
| 540 // permanent memory, does nothing. | |
| 541 virtual void permanent_object_iterate(ObjectClosure* cl) = 0; | |
| 542 | |
| 543 // NOTE! There is no requirement that a collector implement these | |
| 544 // functions. | |
| 545 // | |
| 546 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 547 // each address in the (reserved) heap is a member of exactly | |
| 548 // one block. The defining characteristic of a block is that it is | |
| 549 // possible to find its size, and thus to progress forward to the next | |
| 550 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 551 // represent Java objects, or they might be free blocks in a | |
| 552 // free-list-based heap (or subheap), as long as the two kinds are | |
| 553 // distinguishable and the size of each is determinable. | |
| 554 | |
| 555 // Returns the address of the start of the "block" that contains the | |
| 556 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 557 // may not pack objects densely; a chunk may either be an object or a | |
| 558 // non-object. | |
| 559 virtual HeapWord* block_start(const void* addr) const = 0; | |
| 560 | |
| 561 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 562 // "addr + size" is required to be the start of a new chunk, or the end | |
| 563 // of the active area of the heap. | |
| 564 virtual size_t block_size(const HeapWord* addr) const = 0; | |
| 565 | |
| 566 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 567 // the block is an object. | |
| 568 virtual bool block_is_obj(const HeapWord* addr) const = 0; | |
| 569 | |
| 570 // Returns the longest time (in ms) that has elapsed since the last | |
| 571 // time that any part of the heap was examined by a garbage collection. | |
| 572 virtual jlong millis_since_last_gc() = 0; | |
| 573 | |
| 574 // Perform any cleanup actions necessary before allowing a verification. | |
| 575 virtual void prepare_for_verify() = 0; | |
| 576 | |
|
615
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
542
diff
changeset
|
577 // Generate any dumps preceding or following a full gc |
|
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
542
diff
changeset
|
578 void pre_full_gc_dump(); |
|
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
542
diff
changeset
|
579 void post_full_gc_dump(); |
|
c6c601a0f2d6
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
542
diff
changeset
|
580 |
| 0 | 581 virtual void print() const = 0; |
| 582 virtual void print_on(outputStream* st) const = 0; | |
| 583 | |
| 584 // Print all GC threads (other than the VM thread) | |
| 585 // used by this heap. | |
| 586 virtual void print_gc_threads_on(outputStream* st) const = 0; | |
| 587 void print_gc_threads() { print_gc_threads_on(tty); } | |
| 588 // Iterator for all GC threads (other than VM thread) | |
| 589 virtual void gc_threads_do(ThreadClosure* tc) const = 0; | |
| 590 | |
| 591 // Print any relevant tracing info that flags imply. | |
| 592 // Default implementation does nothing. | |
| 593 virtual void print_tracing_info() const = 0; | |
| 594 | |
| 595 // Heap verification | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
628
diff
changeset
|
596 virtual void verify(bool allow_dirty, bool silent, bool option) = 0; |
| 0 | 597 |
| 598 // Non product verification and debugging. | |
| 599 #ifndef PRODUCT | |
| 600 // Support for PromotionFailureALot. Return true if it's time to cause a | |
| 601 // promotion failure. The no-argument version uses | |
| 602 // this->_promotion_failure_alot_count as the counter. | |
| 603 inline bool promotion_should_fail(volatile size_t* count); | |
| 604 inline bool promotion_should_fail(); | |
| 605 | |
| 606 // Reset the PromotionFailureALot counters. Should be called at the end of a | |
| 607 // GC in which promotion failure ocurred. | |
| 608 inline void reset_promotion_should_fail(volatile size_t* count); | |
| 609 inline void reset_promotion_should_fail(); | |
| 610 #endif // #ifndef PRODUCT | |
| 611 | |
| 612 #ifdef ASSERT | |
| 613 static int fired_fake_oom() { | |
| 614 return (CIFireOOMAt > 1 && _fire_out_of_memory_count >= CIFireOOMAt); | |
| 615 } | |
| 616 #endif | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
617 |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
618 public: |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
619 // This is a convenience method that is used in cases where |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
620 // the actual number of GC worker threads is not pertinent but |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
621 // only whether there more than 0. Use of this method helps |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
622 // reduce the occurrence of ParallelGCThreads to uses where the |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
623 // actual number may be germane. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1552
diff
changeset
|
624 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } |
| 0 | 625 }; |
| 626 | |
| 627 // Class to set and reset the GC cause for a CollectedHeap. | |
| 628 | |
| 629 class GCCauseSetter : StackObj { | |
| 630 CollectedHeap* _heap; | |
| 631 GCCause::Cause _previous_cause; | |
| 632 public: | |
| 633 GCCauseSetter(CollectedHeap* heap, GCCause::Cause cause) { | |
| 634 assert(SafepointSynchronize::is_at_safepoint(), | |
| 635 "This method manipulates heap state without locking"); | |
| 636 _heap = heap; | |
| 637 _previous_cause = _heap->gc_cause(); | |
| 638 _heap->set_gc_cause(cause); | |
| 639 } | |
| 640 | |
| 641 ~GCCauseSetter() { | |
| 642 assert(SafepointSynchronize::is_at_safepoint(), | |
| 643 "This method manipulates heap state without locking"); | |
| 644 _heap->set_gc_cause(_previous_cause); | |
| 645 } | |
| 646 }; |