Mercurial > hg > truffle
annotate src/share/vm/memory/generation.cpp @ 12146:9758d9f36299
8021954: VM SIGSEGV during classloading on MacOS; hs_err_pid file produced
Summary: declare all user-defined operator new()s within Hotspot code with the empty throw() exception specification
Reviewed-by: coleenp, twisti, dholmes, hseigel, dcubed, kvn, ccheung
Contributed-by: lois.foltan@oracle.com
| author | coleenp |
|---|---|
| date | Thu, 29 Aug 2013 18:56:29 -0400 |
| parents | 71180a6e5080 |
| children | 86e6d691f2e1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 10405 | 2 * Copyright (c) 1997, 2013, 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 10405 | 26 #include "gc_implementation/shared/gcTimer.hpp" |
| 27 #include "gc_implementation/shared/gcTrace.hpp" | |
| 1972 | 28 #include "gc_implementation/shared/spaceDecorator.hpp" |
| 29 #include "gc_interface/collectedHeap.inline.hpp" | |
| 30 #include "memory/allocation.inline.hpp" | |
| 31 #include "memory/blockOffsetTable.inline.hpp" | |
| 32 #include "memory/cardTableRS.hpp" | |
| 33 #include "memory/gcLocker.inline.hpp" | |
| 34 #include "memory/genCollectedHeap.hpp" | |
| 35 #include "memory/genMarkSweep.hpp" | |
| 36 #include "memory/genOopClosures.hpp" | |
| 37 #include "memory/genOopClosures.inline.hpp" | |
| 38 #include "memory/generation.hpp" | |
| 39 #include "memory/generation.inline.hpp" | |
| 40 #include "memory/space.inline.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "runtime/java.hpp" | |
| 43 #include "utilities/copy.hpp" | |
| 44 #include "utilities/events.hpp" | |
| 0 | 45 |
| 46 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) : | |
| 47 _level(level), | |
| 48 _ref_processor(NULL) { | |
| 49 if (!_virtual_space.initialize(rs, initial_size)) { | |
| 50 vm_exit_during_initialization("Could not reserve enough space for " | |
| 51 "object heap"); | |
| 52 } | |
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53 // Mangle all of the the initial generation. |
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54 if (ZapUnusedHeapArea) { |
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55 MemRegion mangle_region((HeapWord*)_virtual_space.low(), |
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56 (HeapWord*)_virtual_space.high()); |
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57 SpaceMangler::mangle_region(mangle_region); |
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58 } |
| 0 | 59 _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(), |
| 60 (HeapWord*)_virtual_space.high_boundary()); | |
| 61 } | |
| 62 | |
| 63 GenerationSpec* Generation::spec() { | |
| 64 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 65 assert(0 <= level() && level() < gch->_n_gens, "Bad gen level"); | |
| 66 return gch->_gen_specs[level()]; | |
| 67 } | |
| 68 | |
| 69 size_t Generation::max_capacity() const { | |
| 70 return reserved().byte_size(); | |
| 71 } | |
| 72 | |
| 73 void Generation::print_heap_change(size_t prev_used) const { | |
| 74 if (PrintGCDetails && Verbose) { | |
| 75 gclog_or_tty->print(" " SIZE_FORMAT | |
| 76 "->" SIZE_FORMAT | |
| 77 "(" SIZE_FORMAT ")", | |
| 78 prev_used, used(), capacity()); | |
| 79 } else { | |
| 80 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 81 "->" SIZE_FORMAT "K" | |
| 82 "(" SIZE_FORMAT "K)", | |
| 83 prev_used / K, used() / K, capacity() / K); | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 // By default we get a single threaded default reference processor; | |
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88 // generations needing multi-threaded refs processing or discovery override this method. |
| 0 | 89 void Generation::ref_processor_init() { |
| 90 assert(_ref_processor == NULL, "a reference processor already exists"); | |
| 91 assert(!_reserved.is_empty(), "empty generation?"); | |
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92 _ref_processor = new ReferenceProcessor(_reserved); // a vanilla reference processor |
| 0 | 93 if (_ref_processor == NULL) { |
| 94 vm_exit_during_initialization("Could not allocate ReferenceProcessor object"); | |
| 95 } | |
| 96 } | |
| 97 | |
| 98 void Generation::print() const { print_on(tty); } | |
| 99 | |
| 100 void Generation::print_on(outputStream* st) const { | |
| 101 st->print(" %-20s", name()); | |
| 102 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
| 103 capacity()/K, used()/K); | |
| 104 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 105 _virtual_space.low_boundary(), | |
| 106 _virtual_space.high(), | |
| 107 _virtual_space.high_boundary()); | |
| 108 } | |
| 109 | |
| 110 void Generation::print_summary_info() { print_summary_info_on(tty); } | |
| 111 | |
| 112 void Generation::print_summary_info_on(outputStream* st) { | |
| 113 StatRecord* sr = stat_record(); | |
| 114 double time = sr->accumulated_time.seconds(); | |
| 115 st->print_cr("[Accumulated GC generation %d time %3.7f secs, " | |
| 116 "%d GC's, avg GC time %3.7f]", | |
| 117 level(), time, sr->invocations, | |
| 118 sr->invocations > 0 ? time / sr->invocations : 0.0); | |
| 119 } | |
| 120 | |
| 121 // Utility iterator classes | |
| 122 | |
| 123 class GenerationIsInReservedClosure : public SpaceClosure { | |
| 124 public: | |
| 125 const void* _p; | |
| 126 Space* sp; | |
| 127 virtual void do_space(Space* s) { | |
| 128 if (sp == NULL) { | |
| 129 if (s->is_in_reserved(_p)) sp = s; | |
| 130 } | |
| 131 } | |
| 132 GenerationIsInReservedClosure(const void* p) : _p(p), sp(NULL) {} | |
| 133 }; | |
| 134 | |
| 135 class GenerationIsInClosure : public SpaceClosure { | |
| 136 public: | |
| 137 const void* _p; | |
| 138 Space* sp; | |
| 139 virtual void do_space(Space* s) { | |
| 140 if (sp == NULL) { | |
| 141 if (s->is_in(_p)) sp = s; | |
| 142 } | |
| 143 } | |
| 144 GenerationIsInClosure(const void* p) : _p(p), sp(NULL) {} | |
| 145 }; | |
| 146 | |
| 147 bool Generation::is_in(const void* p) const { | |
| 148 GenerationIsInClosure blk(p); | |
| 149 ((Generation*)this)->space_iterate(&blk); | |
| 150 return blk.sp != NULL; | |
| 151 } | |
| 152 | |
| 153 DefNewGeneration* Generation::as_DefNewGeneration() { | |
| 154 assert((kind() == Generation::DefNew) || | |
| 155 (kind() == Generation::ParNew) || | |
| 156 (kind() == Generation::ASParNew), | |
| 157 "Wrong youngest generation type"); | |
| 158 return (DefNewGeneration*) this; | |
| 159 } | |
| 160 | |
| 161 Generation* Generation::next_gen() const { | |
| 162 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 163 int next = level() + 1; | |
| 164 if (next < gch->_n_gens) { | |
| 165 return gch->_gens[next]; | |
| 166 } else { | |
| 167 return NULL; | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 size_t Generation::max_contiguous_available() const { | |
| 172 // The largest number of contiguous free words in this or any higher generation. | |
| 173 size_t max = 0; | |
| 174 for (const Generation* gen = this; gen != NULL; gen = gen->next_gen()) { | |
| 175 size_t avail = gen->contiguous_available(); | |
| 176 if (avail > max) { | |
| 177 max = avail; | |
| 178 } | |
| 179 } | |
| 180 return max; | |
| 181 } | |
| 182 | |
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183 bool Generation::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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184 size_t available = max_contiguous_available(); |
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185 bool res = (available >= max_promotion_in_bytes); |
| 0 | 186 if (PrintGC && Verbose) { |
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187 gclog_or_tty->print_cr( |
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188 "Generation: promo attempt is%s safe: available("SIZE_FORMAT") %s max_promo("SIZE_FORMAT")", |
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189 res? "":" not", available, res? ">=":"<", |
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190 max_promotion_in_bytes); |
| 0 | 191 } |
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192 return res; |
| 0 | 193 } |
| 194 | |
| 195 // Ignores "ref" and calls allocate(). | |
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196 oop Generation::promote(oop obj, size_t obj_size) { |
| 0 | 197 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 198 | |
| 199 #ifndef PRODUCT | |
| 200 if (Universe::heap()->promotion_should_fail()) { | |
| 201 return NULL; | |
| 202 } | |
| 203 #endif // #ifndef PRODUCT | |
| 204 | |
| 205 HeapWord* result = allocate(obj_size, false); | |
| 206 if (result != NULL) { | |
| 207 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 208 return oop(result); | |
| 209 } else { | |
| 210 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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211 return gch->handle_failed_promotion(this, obj, obj_size); |
| 0 | 212 } |
| 213 } | |
| 214 | |
| 215 oop Generation::par_promote(int thread_num, | |
| 216 oop obj, markOop m, size_t word_sz) { | |
| 217 // Could do a bad general impl here that gets a lock. But no. | |
| 218 ShouldNotCallThis(); | |
| 219 return NULL; | |
| 220 } | |
| 221 | |
| 222 void Generation::par_promote_alloc_undo(int thread_num, | |
| 223 HeapWord* obj, size_t word_sz) { | |
| 224 // Could do a bad general impl here that gets a lock. But no. | |
| 225 guarantee(false, "No good general implementation."); | |
| 226 } | |
| 227 | |
| 228 Space* Generation::space_containing(const void* p) const { | |
| 229 GenerationIsInReservedClosure blk(p); | |
| 230 // Cast away const | |
| 231 ((Generation*)this)->space_iterate(&blk); | |
| 232 return blk.sp; | |
| 233 } | |
| 234 | |
| 235 // Some of these are mediocre general implementations. Should be | |
| 236 // overridden to get better performance. | |
| 237 | |
| 238 class GenerationBlockStartClosure : public SpaceClosure { | |
| 239 public: | |
| 240 const void* _p; | |
| 241 HeapWord* _start; | |
| 242 virtual void do_space(Space* s) { | |
| 243 if (_start == NULL && s->is_in_reserved(_p)) { | |
| 244 _start = s->block_start(_p); | |
| 245 } | |
| 246 } | |
| 247 GenerationBlockStartClosure(const void* p) { _p = p; _start = NULL; } | |
| 248 }; | |
| 249 | |
| 250 HeapWord* Generation::block_start(const void* p) const { | |
| 251 GenerationBlockStartClosure blk(p); | |
| 252 // Cast away const | |
| 253 ((Generation*)this)->space_iterate(&blk); | |
| 254 return blk._start; | |
| 255 } | |
| 256 | |
| 257 class GenerationBlockSizeClosure : public SpaceClosure { | |
| 258 public: | |
| 259 const HeapWord* _p; | |
| 260 size_t size; | |
| 261 virtual void do_space(Space* s) { | |
| 262 if (size == 0 && s->is_in_reserved(_p)) { | |
| 263 size = s->block_size(_p); | |
| 264 } | |
| 265 } | |
| 266 GenerationBlockSizeClosure(const HeapWord* p) { _p = p; size = 0; } | |
| 267 }; | |
| 268 | |
| 269 size_t Generation::block_size(const HeapWord* p) const { | |
| 270 GenerationBlockSizeClosure blk(p); | |
| 271 // Cast away const | |
| 272 ((Generation*)this)->space_iterate(&blk); | |
| 273 assert(blk.size > 0, "seems reasonable"); | |
| 274 return blk.size; | |
| 275 } | |
| 276 | |
| 277 class GenerationBlockIsObjClosure : public SpaceClosure { | |
| 278 public: | |
| 279 const HeapWord* _p; | |
| 280 bool is_obj; | |
| 281 virtual void do_space(Space* s) { | |
| 282 if (!is_obj && s->is_in_reserved(_p)) { | |
| 283 is_obj |= s->block_is_obj(_p); | |
| 284 } | |
| 285 } | |
| 286 GenerationBlockIsObjClosure(const HeapWord* p) { _p = p; is_obj = false; } | |
| 287 }; | |
| 288 | |
| 289 bool Generation::block_is_obj(const HeapWord* p) const { | |
| 290 GenerationBlockIsObjClosure blk(p); | |
| 291 // Cast away const | |
| 292 ((Generation*)this)->space_iterate(&blk); | |
| 293 return blk.is_obj; | |
| 294 } | |
| 295 | |
| 296 class GenerationOopIterateClosure : public SpaceClosure { | |
| 297 public: | |
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298 ExtendedOopClosure* cl; |
| 0 | 299 MemRegion mr; |
| 300 virtual void do_space(Space* s) { | |
| 301 s->oop_iterate(mr, cl); | |
| 302 } | |
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303 GenerationOopIterateClosure(ExtendedOopClosure* _cl, MemRegion _mr) : |
| 0 | 304 cl(_cl), mr(_mr) {} |
| 305 }; | |
| 306 | |
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307 void Generation::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 308 GenerationOopIterateClosure blk(cl, _reserved); |
| 309 space_iterate(&blk); | |
| 310 } | |
| 311 | |
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312 void Generation::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 0 | 313 GenerationOopIterateClosure blk(cl, mr); |
| 314 space_iterate(&blk); | |
| 315 } | |
| 316 | |
| 317 void Generation::younger_refs_in_space_iterate(Space* sp, | |
| 318 OopsInGenClosure* cl) { | |
| 319 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
| 320 rs->younger_refs_in_space_iterate(sp, cl); | |
| 321 } | |
| 322 | |
| 323 class GenerationObjIterateClosure : public SpaceClosure { | |
| 324 private: | |
| 325 ObjectClosure* _cl; | |
| 326 public: | |
| 327 virtual void do_space(Space* s) { | |
| 328 s->object_iterate(_cl); | |
| 329 } | |
| 330 GenerationObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 331 }; | |
| 332 | |
| 333 void Generation::object_iterate(ObjectClosure* cl) { | |
| 334 GenerationObjIterateClosure blk(cl); | |
| 335 space_iterate(&blk); | |
| 336 } | |
| 337 | |
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338 class GenerationSafeObjIterateClosure : public SpaceClosure { |
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339 private: |
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340 ObjectClosure* _cl; |
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341 public: |
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342 virtual void do_space(Space* s) { |
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343 s->safe_object_iterate(_cl); |
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344 } |
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345 GenerationSafeObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} |
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346 }; |
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347 |
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348 void Generation::safe_object_iterate(ObjectClosure* cl) { |
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349 GenerationSafeObjIterateClosure blk(cl); |
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350 space_iterate(&blk); |
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351 } |
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352 |
| 0 | 353 void Generation::prepare_for_compaction(CompactPoint* cp) { |
| 354 // Generic implementation, can be specialized | |
| 355 CompactibleSpace* space = first_compaction_space(); | |
| 356 while (space != NULL) { | |
| 357 space->prepare_for_compaction(cp); | |
| 358 space = space->next_compaction_space(); | |
| 359 } | |
| 360 } | |
| 361 | |
| 362 class AdjustPointersClosure: public SpaceClosure { | |
| 363 public: | |
| 364 void do_space(Space* sp) { | |
| 365 sp->adjust_pointers(); | |
| 366 } | |
| 367 }; | |
| 368 | |
| 369 void Generation::adjust_pointers() { | |
| 370 // Note that this is done over all spaces, not just the compactible | |
| 371 // ones. | |
| 372 AdjustPointersClosure blk; | |
| 373 space_iterate(&blk, true); | |
| 374 } | |
| 375 | |
| 376 void Generation::compact() { | |
| 377 CompactibleSpace* sp = first_compaction_space(); | |
| 378 while (sp != NULL) { | |
| 379 sp->compact(); | |
| 380 sp = sp->next_compaction_space(); | |
| 381 } | |
| 382 } | |
| 383 | |
| 384 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, | |
| 385 int level, | |
| 386 GenRemSet* remset) : | |
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387 Generation(rs, initial_byte_size, level), _rs(remset), |
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388 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(), |
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389 _used_at_prologue() |
| 0 | 390 { |
| 391 HeapWord* start = (HeapWord*)rs.base(); | |
| 392 size_t reserved_byte_size = rs.size(); | |
| 393 assert((uintptr_t(start) & 3) == 0, "bad alignment"); | |
| 394 assert((reserved_byte_size & 3) == 0, "bad alignment"); | |
| 395 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); | |
| 396 _bts = new BlockOffsetSharedArray(reserved_mr, | |
| 397 heap_word_size(initial_byte_size)); | |
| 398 MemRegion committed_mr(start, heap_word_size(initial_byte_size)); | |
| 399 _rs->resize_covered_region(committed_mr); | |
| 400 if (_bts == NULL) | |
| 401 vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); | |
| 402 | |
| 403 // Verify that the start and end of this generation is the start of a card. | |
| 404 // If this wasn't true, a single card could span more than on generation, | |
| 405 // which would cause problems when we commit/uncommit memory, and when we | |
| 406 // clear and dirty cards. | |
| 407 guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); | |
| 408 if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { | |
| 409 // Don't check at the very end of the heap as we'll assert that we're probing off | |
| 410 // the end if we try. | |
| 411 guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); | |
| 412 } | |
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413 _min_heap_delta_bytes = MinHeapDeltaBytes; |
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414 _capacity_at_prologue = initial_byte_size; |
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415 _used_at_prologue = 0; |
| 0 | 416 } |
| 417 | |
|
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418 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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419 assert_locked_or_safepoint(Heap_lock); |
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420 if (bytes == 0) { |
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421 return true; // That's what grow_by(0) would return |
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422 } |
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423 size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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424 if (aligned_bytes == 0){ |
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425 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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426 // return true with the implication that an expansion was done when it |
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427 // was not. A call to expand implies a best effort to expand by "bytes" |
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428 // but not a guarantee. Align down to give a best effort. This is likely |
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429 // the most that the generation can expand since it has some capacity to |
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430 // start with. |
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431 aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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432 } |
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433 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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434 bool success = false; |
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435 if (aligned_expand_bytes > aligned_bytes) { |
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436 success = grow_by(aligned_expand_bytes); |
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437 } |
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438 if (!success) { |
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439 success = grow_by(aligned_bytes); |
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440 } |
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441 if (!success) { |
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442 success = grow_to_reserved(); |
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443 } |
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444 if (PrintGC && Verbose) { |
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445 if (success && GC_locker::is_active_and_needs_gc()) { |
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446 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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447 } |
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448 } |
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449 |
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450 return success; |
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451 } |
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452 |
| 0 | 453 |
| 454 // No young generation references, clear this generation's cards. | |
| 455 void CardGeneration::clear_remembered_set() { | |
| 456 _rs->clear(reserved()); | |
| 457 } | |
| 458 | |
| 459 | |
| 460 // Objects in this generation may have moved, invalidate this | |
| 461 // generation's cards. | |
| 462 void CardGeneration::invalidate_remembered_set() { | |
| 463 _rs->invalidate(used_region()); | |
| 464 } | |
| 465 | |
| 466 | |
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467 void CardGeneration::compute_new_size() { |
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468 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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469 size_t current_shrink_factor = _shrink_factor; |
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470 _shrink_factor = 0; |
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471 |
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472 // We don't have floating point command-line arguments |
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473 // Note: argument processing ensures that MinHeapFreeRatio < 100. |
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474 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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475 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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476 |
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477 // Compute some numbers about the state of the heap. |
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478 const size_t used_after_gc = used(); |
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479 const size_t capacity_after_gc = capacity(); |
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480 |
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481 const double min_tmp = used_after_gc / maximum_used_percentage; |
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482 size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); |
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483 // Don't shrink less than the initial generation size |
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484 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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485 spec()->init_size()); |
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486 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); |
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487 |
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488 if (PrintGC && Verbose) { |
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489 const size_t free_after_gc = free(); |
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490 const double free_percentage = ((double)free_after_gc) / capacity_after_gc; |
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491 gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); |
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492 gclog_or_tty->print_cr(" " |
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493 " minimum_free_percentage: %6.2f" |
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494 " maximum_used_percentage: %6.2f", |
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495 minimum_free_percentage, |
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496 maximum_used_percentage); |
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497 gclog_or_tty->print_cr(" " |
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498 " free_after_gc : %6.1fK" |
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499 " used_after_gc : %6.1fK" |
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500 " capacity_after_gc : %6.1fK", |
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501 free_after_gc / (double) K, |
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502 used_after_gc / (double) K, |
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503 capacity_after_gc / (double) K); |
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504 gclog_or_tty->print_cr(" " |
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505 " free_percentage: %6.2f", |
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506 free_percentage); |
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507 } |
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508 |
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509 if (capacity_after_gc < minimum_desired_capacity) { |
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510 // If we have less free space than we want then expand |
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511 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; |
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512 // Don't expand unless it's significant |
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513 if (expand_bytes >= _min_heap_delta_bytes) { |
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514 expand(expand_bytes, 0); // safe if expansion fails |
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515 } |
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516 if (PrintGC && Verbose) { |
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517 gclog_or_tty->print_cr(" expanding:" |
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518 " minimum_desired_capacity: %6.1fK" |
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519 " expand_bytes: %6.1fK" |
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520 " _min_heap_delta_bytes: %6.1fK", |
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521 minimum_desired_capacity / (double) K, |
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522 expand_bytes / (double) K, |
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523 _min_heap_delta_bytes / (double) K); |
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524 } |
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525 return; |
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526 } |
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527 |
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528 // No expansion, now see if we want to shrink |
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529 size_t shrink_bytes = 0; |
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530 // We would never want to shrink more than this |
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531 size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; |
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532 |
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533 if (MaxHeapFreeRatio < 100) { |
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534 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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535 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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536 const double max_tmp = used_after_gc / minimum_used_percentage; |
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537 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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538 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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539 spec()->init_size()); |
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540 if (PrintGC && Verbose) { |
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541 gclog_or_tty->print_cr(" " |
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542 " maximum_free_percentage: %6.2f" |
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543 " minimum_used_percentage: %6.2f", |
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544 maximum_free_percentage, |
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545 minimum_used_percentage); |
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546 gclog_or_tty->print_cr(" " |
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547 " _capacity_at_prologue: %6.1fK" |
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548 " minimum_desired_capacity: %6.1fK" |
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549 " maximum_desired_capacity: %6.1fK", |
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550 _capacity_at_prologue / (double) K, |
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551 minimum_desired_capacity / (double) K, |
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552 maximum_desired_capacity / (double) K); |
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553 } |
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554 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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555 "sanity check"); |
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556 |
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557 if (capacity_after_gc > maximum_desired_capacity) { |
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558 // Capacity too large, compute shrinking size |
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559 shrink_bytes = capacity_after_gc - maximum_desired_capacity; |
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560 // We don't want shrink all the way back to initSize if people call |
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561 // System.gc(), because some programs do that between "phases" and then |
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562 // we'd just have to grow the heap up again for the next phase. So we |
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563 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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564 // on the third call, and 100% by the fourth call. But if we recompute |
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565 // size without shrinking, it goes back to 0%. |
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566 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
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567 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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568 if (current_shrink_factor == 0) { |
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569 _shrink_factor = 10; |
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570 } else { |
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571 _shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); |
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572 } |
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573 if (PrintGC && Verbose) { |
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574 gclog_or_tty->print_cr(" " |
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575 " shrinking:" |
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576 " initSize: %.1fK" |
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577 " maximum_desired_capacity: %.1fK", |
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578 spec()->init_size() / (double) K, |
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579 maximum_desired_capacity / (double) K); |
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580 gclog_or_tty->print_cr(" " |
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581 " shrink_bytes: %.1fK" |
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582 " current_shrink_factor: %d" |
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583 " new shrink factor: %d" |
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584 " _min_heap_delta_bytes: %.1fK", |
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585 shrink_bytes / (double) K, |
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586 current_shrink_factor, |
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587 _shrink_factor, |
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588 _min_heap_delta_bytes / (double) K); |
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589 } |
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590 } |
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591 } |
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592 |
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593 if (capacity_after_gc > _capacity_at_prologue) { |
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594 // We might have expanded for promotions, in which case we might want to |
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595 // take back that expansion if there's room after GC. That keeps us from |
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596 // stretching the heap with promotions when there's plenty of room. |
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597 size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; |
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598 expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); |
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599 // We have two shrinking computations, take the largest |
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600 shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); |
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601 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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602 if (PrintGC && Verbose) { |
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603 gclog_or_tty->print_cr(" " |
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604 " aggressive shrinking:" |
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605 " _capacity_at_prologue: %.1fK" |
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606 " capacity_after_gc: %.1fK" |
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607 " expansion_for_promotion: %.1fK" |
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608 " shrink_bytes: %.1fK", |
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609 capacity_after_gc / (double) K, |
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610 _capacity_at_prologue / (double) K, |
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611 expansion_for_promotion / (double) K, |
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612 shrink_bytes / (double) K); |
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613 } |
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614 } |
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615 // Don't shrink unless it's significant |
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616 if (shrink_bytes >= _min_heap_delta_bytes) { |
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617 shrink(shrink_bytes); |
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618 } |
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619 } |
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620 |
| 0 | 621 // Currently nothing to do. |
| 622 void CardGeneration::prepare_for_verify() {} | |
| 623 | |
| 624 | |
| 625 void OneContigSpaceCardGeneration::collect(bool full, | |
| 626 bool clear_all_soft_refs, | |
| 627 size_t size, | |
| 628 bool is_tlab) { | |
| 10405 | 629 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 630 | |
| 0 | 631 SpecializationStats::clear(); |
| 632 // Temporarily expand the span of our ref processor, so | |
| 633 // refs discovery is over the entire heap, not just this generation | |
| 634 ReferenceProcessorSpanMutator | |
| 10405 | 635 x(ref_processor(), gch->reserved_region()); |
| 636 | |
| 637 STWGCTimer* gc_timer = GenMarkSweep::gc_timer(); | |
| 638 gc_timer->register_gc_start(os::elapsed_counter()); | |
| 639 | |
| 640 SerialOldTracer* gc_tracer = GenMarkSweep::gc_tracer(); | |
| 641 gc_tracer->report_gc_start(gch->gc_cause(), gc_timer->gc_start()); | |
| 642 | |
| 0 | 643 GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs); |
| 10405 | 644 |
| 645 gc_timer->register_gc_end(os::elapsed_counter()); | |
| 646 | |
| 647 gc_tracer->report_gc_end(os::elapsed_counter(), gc_timer->time_partitions()); | |
| 648 | |
| 0 | 649 SpecializationStats::print(); |
| 650 } | |
| 651 | |
| 652 HeapWord* | |
| 653 OneContigSpaceCardGeneration::expand_and_allocate(size_t word_size, | |
| 654 bool is_tlab, | |
| 655 bool parallel) { | |
| 656 assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation"); | |
| 657 if (parallel) { | |
| 658 MutexLocker x(ParGCRareEvent_lock); | |
| 659 HeapWord* result = NULL; | |
| 660 size_t byte_size = word_size * HeapWordSize; | |
| 661 while (true) { | |
| 662 expand(byte_size, _min_heap_delta_bytes); | |
| 663 if (GCExpandToAllocateDelayMillis > 0) { | |
| 664 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
| 665 } | |
| 666 result = _the_space->par_allocate(word_size); | |
| 667 if ( result != NULL) { | |
| 668 return result; | |
| 669 } else { | |
| 670 // If there's not enough expansion space available, give up. | |
| 671 if (_virtual_space.uncommitted_size() < byte_size) { | |
| 672 return NULL; | |
| 673 } | |
| 674 // else try again | |
| 675 } | |
| 676 } | |
| 677 } else { | |
| 678 expand(word_size*HeapWordSize, _min_heap_delta_bytes); | |
| 679 return _the_space->allocate(word_size); | |
| 680 } | |
| 681 } | |
| 682 | |
|
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683 bool OneContigSpaceCardGeneration::expand(size_t bytes, size_t expand_bytes) { |
| 0 | 684 GCMutexLocker x(ExpandHeap_lock); |
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685 return CardGeneration::expand(bytes, expand_bytes); |
| 0 | 686 } |
| 687 | |
| 688 | |
| 689 void OneContigSpaceCardGeneration::shrink(size_t bytes) { | |
| 690 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 691 size_t size = ReservedSpace::page_align_size_down(bytes); | |
| 692 if (size > 0) { | |
| 693 shrink_by(size); | |
| 694 } | |
| 695 } | |
| 696 | |
| 697 | |
| 698 size_t OneContigSpaceCardGeneration::capacity() const { | |
| 699 return _the_space->capacity(); | |
| 700 } | |
| 701 | |
| 702 | |
| 703 size_t OneContigSpaceCardGeneration::used() const { | |
| 704 return _the_space->used(); | |
| 705 } | |
| 706 | |
| 707 | |
| 708 size_t OneContigSpaceCardGeneration::free() const { | |
| 709 return _the_space->free(); | |
| 710 } | |
| 711 | |
| 712 MemRegion OneContigSpaceCardGeneration::used_region() const { | |
| 713 return the_space()->used_region(); | |
| 714 } | |
| 715 | |
| 716 size_t OneContigSpaceCardGeneration::unsafe_max_alloc_nogc() const { | |
| 717 return _the_space->free(); | |
| 718 } | |
| 719 | |
| 720 size_t OneContigSpaceCardGeneration::contiguous_available() const { | |
| 721 return _the_space->free() + _virtual_space.uncommitted_size(); | |
| 722 } | |
| 723 | |
| 724 bool OneContigSpaceCardGeneration::grow_by(size_t bytes) { | |
| 725 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 726 bool result = _virtual_space.expand_by(bytes); | |
| 727 if (result) { | |
| 728 size_t new_word_size = | |
| 729 heap_word_size(_virtual_space.committed_size()); | |
| 730 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 731 // Expand card table | |
| 732 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 733 // Expand shared block offset array | |
| 734 _bts->resize(new_word_size); | |
| 735 | |
| 736 // Fix for bug #4668531 | |
|
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737 if (ZapUnusedHeapArea) { |
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738 MemRegion mangle_region(_the_space->end(), |
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739 (HeapWord*)_virtual_space.high()); |
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740 SpaceMangler::mangle_region(mangle_region); |
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741 } |
| 0 | 742 |
| 743 // Expand space -- also expands space's BOT | |
| 744 // (which uses (part of) shared array above) | |
| 745 _the_space->set_end((HeapWord*)_virtual_space.high()); | |
| 746 | |
| 747 // update the space and generation capacity counters | |
| 748 update_counters(); | |
| 749 | |
| 750 if (Verbose && PrintGC) { | |
| 751 size_t new_mem_size = _virtual_space.committed_size(); | |
| 752 size_t old_mem_size = new_mem_size - bytes; | |
| 753 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
| 754 SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 755 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
| 756 } | |
| 757 } | |
| 758 return result; | |
| 759 } | |
| 760 | |
| 761 | |
| 762 bool OneContigSpaceCardGeneration::grow_to_reserved() { | |
| 763 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 764 bool success = true; | |
| 765 const size_t remaining_bytes = _virtual_space.uncommitted_size(); | |
| 766 if (remaining_bytes > 0) { | |
| 767 success = grow_by(remaining_bytes); | |
| 768 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) | |
| 769 } | |
| 770 return success; | |
| 771 } | |
| 772 | |
| 773 void OneContigSpaceCardGeneration::shrink_by(size_t bytes) { | |
| 774 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 775 // Shrink committed space | |
| 776 _virtual_space.shrink_by(bytes); | |
| 777 // Shrink space; this also shrinks the space's BOT | |
| 778 _the_space->set_end((HeapWord*) _virtual_space.high()); | |
| 779 size_t new_word_size = heap_word_size(_the_space->capacity()); | |
| 780 // Shrink the shared block offset array | |
| 781 _bts->resize(new_word_size); | |
| 782 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 783 // Shrink the card table | |
| 784 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 785 | |
| 786 if (Verbose && PrintGC) { | |
| 787 size_t new_mem_size = _virtual_space.committed_size(); | |
| 788 size_t old_mem_size = new_mem_size + bytes; | |
| 789 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 790 name(), old_mem_size/K, new_mem_size/K); | |
| 791 } | |
| 792 } | |
| 793 | |
| 794 // Currently nothing to do. | |
| 795 void OneContigSpaceCardGeneration::prepare_for_verify() {} | |
| 796 | |
| 797 | |
|
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798 // Override for a card-table generation with one contiguous |
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799 // space. NOTE: For reasons that are lost in the fog of history, |
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800 // this code is used when you iterate over perm gen objects, |
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801 // even when one uses CDS, where the perm gen has a couple of |
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802 // other spaces; this is because CompactingPermGenGen derives |
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803 // from OneContigSpaceCardGeneration. This should be cleaned up, |
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804 // see CR 6897789.. |
| 0 | 805 void OneContigSpaceCardGeneration::object_iterate(ObjectClosure* blk) { |
| 806 _the_space->object_iterate(blk); | |
| 807 } | |
| 808 | |
| 809 void OneContigSpaceCardGeneration::space_iterate(SpaceClosure* blk, | |
| 810 bool usedOnly) { | |
| 811 blk->do_space(_the_space); | |
| 812 } | |
| 813 | |
| 814 void OneContigSpaceCardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { | |
| 815 blk->set_generation(this); | |
| 816 younger_refs_in_space_iterate(_the_space, blk); | |
| 817 blk->reset_generation(); | |
| 818 } | |
| 819 | |
| 820 void OneContigSpaceCardGeneration::save_marks() { | |
| 821 _the_space->set_saved_mark(); | |
| 822 } | |
| 823 | |
| 824 | |
| 825 void OneContigSpaceCardGeneration::reset_saved_marks() { | |
| 826 _the_space->reset_saved_mark(); | |
| 827 } | |
| 828 | |
| 829 | |
| 830 bool OneContigSpaceCardGeneration::no_allocs_since_save_marks() { | |
| 831 return _the_space->saved_mark_at_top(); | |
| 832 } | |
| 833 | |
| 834 #define OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 835 \ | |
| 836 void OneContigSpaceCardGeneration:: \ | |
| 837 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
| 838 blk->set_generation(this); \ | |
| 839 _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \ | |
| 840 blk->reset_generation(); \ | |
| 841 save_marks(); \ | |
| 842 } | |
| 843 | |
| 844 ALL_SINCE_SAVE_MARKS_CLOSURES(OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 845 | |
| 846 #undef OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 847 | |
| 848 | |
| 849 void OneContigSpaceCardGeneration::gc_epilogue(bool full) { | |
| 850 _last_gc = WaterMark(the_space(), the_space()->top()); | |
| 851 | |
| 852 // update the generation and space performance counters | |
| 853 update_counters(); | |
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854 if (ZapUnusedHeapArea) { |
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855 the_space()->check_mangled_unused_area_complete(); |
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856 } |
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857 } |
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858 |
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859 void OneContigSpaceCardGeneration::record_spaces_top() { |
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860 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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861 the_space()->set_top_for_allocations(); |
| 0 | 862 } |
| 863 | |
| 6008 | 864 void OneContigSpaceCardGeneration::verify() { |
| 865 the_space()->verify(); | |
| 0 | 866 } |
| 867 | |
| 868 void OneContigSpaceCardGeneration::print_on(outputStream* st) const { | |
| 869 Generation::print_on(st); | |
| 870 st->print(" the"); | |
| 871 the_space()->print_on(st); | |
| 872 } |