Mercurial > hg > truffle
annotate src/share/vm/memory/generation.cpp @ 20587:d63ce76a0f0e
8034056: assert(_heap_alignment >= _space_alignment) failed: heap_alignment less than space_alignment
Reviewed-by: tschatzl, tamao
| author | jmasa |
|---|---|
| date | Tue, 05 Aug 2014 15:41:12 -0700 |
| parents | 30c99d8e0f02 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 |
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46 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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47 |
| 0 | 48 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) : |
| 49 _level(level), | |
| 50 _ref_processor(NULL) { | |
| 51 if (!_virtual_space.initialize(rs, initial_size)) { | |
| 52 vm_exit_during_initialization("Could not reserve enough space for " | |
| 53 "object heap"); | |
| 54 } | |
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55 // Mangle all of the the initial generation. |
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56 if (ZapUnusedHeapArea) { |
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57 MemRegion mangle_region((HeapWord*)_virtual_space.low(), |
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58 (HeapWord*)_virtual_space.high()); |
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59 SpaceMangler::mangle_region(mangle_region); |
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60 } |
| 0 | 61 _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(), |
| 62 (HeapWord*)_virtual_space.high_boundary()); | |
| 63 } | |
| 64 | |
| 65 GenerationSpec* Generation::spec() { | |
| 66 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 67 assert(0 <= level() && level() < gch->_n_gens, "Bad gen level"); | |
| 68 return gch->_gen_specs[level()]; | |
| 69 } | |
| 70 | |
| 71 size_t Generation::max_capacity() const { | |
| 72 return reserved().byte_size(); | |
| 73 } | |
| 74 | |
| 75 void Generation::print_heap_change(size_t prev_used) const { | |
| 76 if (PrintGCDetails && Verbose) { | |
| 77 gclog_or_tty->print(" " SIZE_FORMAT | |
| 78 "->" SIZE_FORMAT | |
| 79 "(" SIZE_FORMAT ")", | |
| 80 prev_used, used(), capacity()); | |
| 81 } else { | |
| 82 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 83 "->" SIZE_FORMAT "K" | |
| 84 "(" SIZE_FORMAT "K)", | |
| 85 prev_used / K, used() / K, capacity() / K); | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 // By default we get a single threaded default reference processor; | |
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90 // generations needing multi-threaded refs processing or discovery override this method. |
| 0 | 91 void Generation::ref_processor_init() { |
| 92 assert(_ref_processor == NULL, "a reference processor already exists"); | |
| 93 assert(!_reserved.is_empty(), "empty generation?"); | |
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94 _ref_processor = new ReferenceProcessor(_reserved); // a vanilla reference processor |
| 0 | 95 if (_ref_processor == NULL) { |
| 96 vm_exit_during_initialization("Could not allocate ReferenceProcessor object"); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 void Generation::print() const { print_on(tty); } | |
| 101 | |
| 102 void Generation::print_on(outputStream* st) const { | |
| 103 st->print(" %-20s", name()); | |
| 104 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
| 105 capacity()/K, used()/K); | |
| 106 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 107 _virtual_space.low_boundary(), | |
| 108 _virtual_space.high(), | |
| 109 _virtual_space.high_boundary()); | |
| 110 } | |
| 111 | |
| 112 void Generation::print_summary_info() { print_summary_info_on(tty); } | |
| 113 | |
| 114 void Generation::print_summary_info_on(outputStream* st) { | |
| 115 StatRecord* sr = stat_record(); | |
| 116 double time = sr->accumulated_time.seconds(); | |
| 117 st->print_cr("[Accumulated GC generation %d time %3.7f secs, " | |
| 118 "%d GC's, avg GC time %3.7f]", | |
| 119 level(), time, sr->invocations, | |
| 120 sr->invocations > 0 ? time / sr->invocations : 0.0); | |
| 121 } | |
| 122 | |
| 123 // Utility iterator classes | |
| 124 | |
| 125 class GenerationIsInReservedClosure : public SpaceClosure { | |
| 126 public: | |
| 127 const void* _p; | |
| 128 Space* sp; | |
| 129 virtual void do_space(Space* s) { | |
| 130 if (sp == NULL) { | |
| 131 if (s->is_in_reserved(_p)) sp = s; | |
| 132 } | |
| 133 } | |
| 134 GenerationIsInReservedClosure(const void* p) : _p(p), sp(NULL) {} | |
| 135 }; | |
| 136 | |
| 137 class GenerationIsInClosure : public SpaceClosure { | |
| 138 public: | |
| 139 const void* _p; | |
| 140 Space* sp; | |
| 141 virtual void do_space(Space* s) { | |
| 142 if (sp == NULL) { | |
| 143 if (s->is_in(_p)) sp = s; | |
| 144 } | |
| 145 } | |
| 146 GenerationIsInClosure(const void* p) : _p(p), sp(NULL) {} | |
| 147 }; | |
| 148 | |
| 149 bool Generation::is_in(const void* p) const { | |
| 150 GenerationIsInClosure blk(p); | |
| 151 ((Generation*)this)->space_iterate(&blk); | |
| 152 return blk.sp != NULL; | |
| 153 } | |
| 154 | |
| 155 DefNewGeneration* Generation::as_DefNewGeneration() { | |
| 156 assert((kind() == Generation::DefNew) || | |
| 157 (kind() == Generation::ParNew) || | |
| 158 (kind() == Generation::ASParNew), | |
| 159 "Wrong youngest generation type"); | |
| 160 return (DefNewGeneration*) this; | |
| 161 } | |
| 162 | |
| 163 Generation* Generation::next_gen() const { | |
| 164 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 165 int next = level() + 1; | |
| 166 if (next < gch->_n_gens) { | |
| 167 return gch->_gens[next]; | |
| 168 } else { | |
| 169 return NULL; | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 size_t Generation::max_contiguous_available() const { | |
| 174 // The largest number of contiguous free words in this or any higher generation. | |
| 175 size_t max = 0; | |
| 176 for (const Generation* gen = this; gen != NULL; gen = gen->next_gen()) { | |
| 177 size_t avail = gen->contiguous_available(); | |
| 178 if (avail > max) { | |
| 179 max = avail; | |
| 180 } | |
| 181 } | |
| 182 return max; | |
| 183 } | |
| 184 | |
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185 bool Generation::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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186 size_t available = max_contiguous_available(); |
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187 bool res = (available >= max_promotion_in_bytes); |
| 0 | 188 if (PrintGC && Verbose) { |
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189 gclog_or_tty->print_cr( |
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190 "Generation: promo attempt is%s safe: available("SIZE_FORMAT") %s max_promo("SIZE_FORMAT")", |
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191 res? "":" not", available, res? ">=":"<", |
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192 max_promotion_in_bytes); |
| 0 | 193 } |
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194 return res; |
| 0 | 195 } |
| 196 | |
| 197 // Ignores "ref" and calls allocate(). | |
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198 oop Generation::promote(oop obj, size_t obj_size) { |
| 0 | 199 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
| 200 | |
| 201 #ifndef PRODUCT | |
| 202 if (Universe::heap()->promotion_should_fail()) { | |
| 203 return NULL; | |
| 204 } | |
| 205 #endif // #ifndef PRODUCT | |
| 206 | |
| 207 HeapWord* result = allocate(obj_size, false); | |
| 208 if (result != NULL) { | |
| 209 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
| 210 return oop(result); | |
| 211 } else { | |
| 212 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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213 return gch->handle_failed_promotion(this, obj, obj_size); |
| 0 | 214 } |
| 215 } | |
| 216 | |
| 217 oop Generation::par_promote(int thread_num, | |
| 218 oop obj, markOop m, size_t word_sz) { | |
| 219 // Could do a bad general impl here that gets a lock. But no. | |
| 220 ShouldNotCallThis(); | |
| 221 return NULL; | |
| 222 } | |
| 223 | |
| 224 void Generation::par_promote_alloc_undo(int thread_num, | |
| 225 HeapWord* obj, size_t word_sz) { | |
| 226 // Could do a bad general impl here that gets a lock. But no. | |
| 227 guarantee(false, "No good general implementation."); | |
| 228 } | |
| 229 | |
| 230 Space* Generation::space_containing(const void* p) const { | |
| 231 GenerationIsInReservedClosure blk(p); | |
| 232 // Cast away const | |
| 233 ((Generation*)this)->space_iterate(&blk); | |
| 234 return blk.sp; | |
| 235 } | |
| 236 | |
| 237 // Some of these are mediocre general implementations. Should be | |
| 238 // overridden to get better performance. | |
| 239 | |
| 240 class GenerationBlockStartClosure : public SpaceClosure { | |
| 241 public: | |
| 242 const void* _p; | |
| 243 HeapWord* _start; | |
| 244 virtual void do_space(Space* s) { | |
| 245 if (_start == NULL && s->is_in_reserved(_p)) { | |
| 246 _start = s->block_start(_p); | |
| 247 } | |
| 248 } | |
| 249 GenerationBlockStartClosure(const void* p) { _p = p; _start = NULL; } | |
| 250 }; | |
| 251 | |
| 252 HeapWord* Generation::block_start(const void* p) const { | |
| 253 GenerationBlockStartClosure blk(p); | |
| 254 // Cast away const | |
| 255 ((Generation*)this)->space_iterate(&blk); | |
| 256 return blk._start; | |
| 257 } | |
| 258 | |
| 259 class GenerationBlockSizeClosure : public SpaceClosure { | |
| 260 public: | |
| 261 const HeapWord* _p; | |
| 262 size_t size; | |
| 263 virtual void do_space(Space* s) { | |
| 264 if (size == 0 && s->is_in_reserved(_p)) { | |
| 265 size = s->block_size(_p); | |
| 266 } | |
| 267 } | |
| 268 GenerationBlockSizeClosure(const HeapWord* p) { _p = p; size = 0; } | |
| 269 }; | |
| 270 | |
| 271 size_t Generation::block_size(const HeapWord* p) const { | |
| 272 GenerationBlockSizeClosure blk(p); | |
| 273 // Cast away const | |
| 274 ((Generation*)this)->space_iterate(&blk); | |
| 275 assert(blk.size > 0, "seems reasonable"); | |
| 276 return blk.size; | |
| 277 } | |
| 278 | |
| 279 class GenerationBlockIsObjClosure : public SpaceClosure { | |
| 280 public: | |
| 281 const HeapWord* _p; | |
| 282 bool is_obj; | |
| 283 virtual void do_space(Space* s) { | |
| 284 if (!is_obj && s->is_in_reserved(_p)) { | |
| 285 is_obj |= s->block_is_obj(_p); | |
| 286 } | |
| 287 } | |
| 288 GenerationBlockIsObjClosure(const HeapWord* p) { _p = p; is_obj = false; } | |
| 289 }; | |
| 290 | |
| 291 bool Generation::block_is_obj(const HeapWord* p) const { | |
| 292 GenerationBlockIsObjClosure blk(p); | |
| 293 // Cast away const | |
| 294 ((Generation*)this)->space_iterate(&blk); | |
| 295 return blk.is_obj; | |
| 296 } | |
| 297 | |
| 298 class GenerationOopIterateClosure : public SpaceClosure { | |
| 299 public: | |
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300 ExtendedOopClosure* _cl; |
| 0 | 301 virtual void do_space(Space* s) { |
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302 s->oop_iterate(_cl); |
| 0 | 303 } |
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304 GenerationOopIterateClosure(ExtendedOopClosure* cl) : |
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305 _cl(cl) {} |
| 0 | 306 }; |
| 307 | |
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308 void Generation::oop_iterate(ExtendedOopClosure* cl) { |
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309 GenerationOopIterateClosure blk(cl); |
| 0 | 310 space_iterate(&blk); |
| 311 } | |
| 312 | |
| 313 void Generation::younger_refs_in_space_iterate(Space* sp, | |
| 314 OopsInGenClosure* cl) { | |
| 315 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
| 316 rs->younger_refs_in_space_iterate(sp, cl); | |
| 317 } | |
| 318 | |
| 319 class GenerationObjIterateClosure : public SpaceClosure { | |
| 320 private: | |
| 321 ObjectClosure* _cl; | |
| 322 public: | |
| 323 virtual void do_space(Space* s) { | |
| 324 s->object_iterate(_cl); | |
| 325 } | |
| 326 GenerationObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 327 }; | |
| 328 | |
| 329 void Generation::object_iterate(ObjectClosure* cl) { | |
| 330 GenerationObjIterateClosure blk(cl); | |
| 331 space_iterate(&blk); | |
| 332 } | |
| 333 | |
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334 class GenerationSafeObjIterateClosure : public SpaceClosure { |
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335 private: |
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336 ObjectClosure* _cl; |
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337 public: |
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338 virtual void do_space(Space* s) { |
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339 s->safe_object_iterate(_cl); |
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340 } |
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341 GenerationSafeObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} |
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342 }; |
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343 |
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344 void Generation::safe_object_iterate(ObjectClosure* cl) { |
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345 GenerationSafeObjIterateClosure blk(cl); |
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346 space_iterate(&blk); |
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347 } |
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348 |
| 0 | 349 void Generation::prepare_for_compaction(CompactPoint* cp) { |
| 350 // Generic implementation, can be specialized | |
| 351 CompactibleSpace* space = first_compaction_space(); | |
| 352 while (space != NULL) { | |
| 353 space->prepare_for_compaction(cp); | |
| 354 space = space->next_compaction_space(); | |
| 355 } | |
| 356 } | |
| 357 | |
| 358 class AdjustPointersClosure: public SpaceClosure { | |
| 359 public: | |
| 360 void do_space(Space* sp) { | |
| 361 sp->adjust_pointers(); | |
| 362 } | |
| 363 }; | |
| 364 | |
| 365 void Generation::adjust_pointers() { | |
| 366 // Note that this is done over all spaces, not just the compactible | |
| 367 // ones. | |
| 368 AdjustPointersClosure blk; | |
| 369 space_iterate(&blk, true); | |
| 370 } | |
| 371 | |
| 372 void Generation::compact() { | |
| 373 CompactibleSpace* sp = first_compaction_space(); | |
| 374 while (sp != NULL) { | |
| 375 sp->compact(); | |
| 376 sp = sp->next_compaction_space(); | |
| 377 } | |
| 378 } | |
| 379 | |
| 380 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, | |
| 381 int level, | |
| 382 GenRemSet* remset) : | |
|
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383 Generation(rs, initial_byte_size, level), _rs(remset), |
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384 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(), |
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385 _used_at_prologue() |
| 0 | 386 { |
| 387 HeapWord* start = (HeapWord*)rs.base(); | |
| 388 size_t reserved_byte_size = rs.size(); | |
| 389 assert((uintptr_t(start) & 3) == 0, "bad alignment"); | |
| 390 assert((reserved_byte_size & 3) == 0, "bad alignment"); | |
| 391 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); | |
| 392 _bts = new BlockOffsetSharedArray(reserved_mr, | |
| 393 heap_word_size(initial_byte_size)); | |
| 394 MemRegion committed_mr(start, heap_word_size(initial_byte_size)); | |
| 395 _rs->resize_covered_region(committed_mr); | |
| 396 if (_bts == NULL) | |
| 397 vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); | |
| 398 | |
| 399 // Verify that the start and end of this generation is the start of a card. | |
| 400 // If this wasn't true, a single card could span more than on generation, | |
| 401 // which would cause problems when we commit/uncommit memory, and when we | |
| 402 // clear and dirty cards. | |
| 403 guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); | |
| 404 if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { | |
| 405 // Don't check at the very end of the heap as we'll assert that we're probing off | |
| 406 // the end if we try. | |
| 407 guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); | |
| 408 } | |
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409 _min_heap_delta_bytes = MinHeapDeltaBytes; |
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410 _capacity_at_prologue = initial_byte_size; |
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411 _used_at_prologue = 0; |
| 0 | 412 } |
| 413 | |
|
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414 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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415 assert_locked_or_safepoint(Heap_lock); |
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416 if (bytes == 0) { |
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417 return true; // That's what grow_by(0) would return |
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418 } |
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419 size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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420 if (aligned_bytes == 0){ |
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421 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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422 // return true with the implication that an expansion was done when it |
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423 // was not. A call to expand implies a best effort to expand by "bytes" |
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424 // but not a guarantee. Align down to give a best effort. This is likely |
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425 // the most that the generation can expand since it has some capacity to |
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426 // start with. |
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427 aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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428 } |
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429 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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430 bool success = false; |
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431 if (aligned_expand_bytes > aligned_bytes) { |
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432 success = grow_by(aligned_expand_bytes); |
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433 } |
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434 if (!success) { |
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435 success = grow_by(aligned_bytes); |
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436 } |
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437 if (!success) { |
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438 success = grow_to_reserved(); |
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439 } |
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440 if (PrintGC && Verbose) { |
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441 if (success && GC_locker::is_active_and_needs_gc()) { |
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442 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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443 } |
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444 } |
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445 |
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446 return success; |
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447 } |
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448 |
| 0 | 449 |
| 450 // No young generation references, clear this generation's cards. | |
| 451 void CardGeneration::clear_remembered_set() { | |
| 452 _rs->clear(reserved()); | |
| 453 } | |
| 454 | |
| 455 | |
| 456 // Objects in this generation may have moved, invalidate this | |
| 457 // generation's cards. | |
| 458 void CardGeneration::invalidate_remembered_set() { | |
| 459 _rs->invalidate(used_region()); | |
| 460 } | |
| 461 | |
| 462 | |
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463 void CardGeneration::compute_new_size() { |
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464 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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465 size_t current_shrink_factor = _shrink_factor; |
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466 _shrink_factor = 0; |
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467 |
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468 // We don't have floating point command-line arguments |
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469 // Note: argument processing ensures that MinHeapFreeRatio < 100. |
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470 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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471 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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472 |
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473 // Compute some numbers about the state of the heap. |
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474 const size_t used_after_gc = used(); |
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475 const size_t capacity_after_gc = capacity(); |
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476 |
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477 const double min_tmp = used_after_gc / maximum_used_percentage; |
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478 size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); |
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479 // Don't shrink less than the initial generation size |
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480 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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481 spec()->init_size()); |
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482 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); |
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483 |
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484 if (PrintGC && Verbose) { |
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485 const size_t free_after_gc = free(); |
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486 const double free_percentage = ((double)free_after_gc) / capacity_after_gc; |
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487 gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); |
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488 gclog_or_tty->print_cr(" " |
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489 " minimum_free_percentage: %6.2f" |
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490 " maximum_used_percentage: %6.2f", |
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491 minimum_free_percentage, |
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492 maximum_used_percentage); |
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493 gclog_or_tty->print_cr(" " |
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494 " free_after_gc : %6.1fK" |
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495 " used_after_gc : %6.1fK" |
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496 " capacity_after_gc : %6.1fK", |
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497 free_after_gc / (double) K, |
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498 used_after_gc / (double) K, |
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499 capacity_after_gc / (double) K); |
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500 gclog_or_tty->print_cr(" " |
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501 " free_percentage: %6.2f", |
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502 free_percentage); |
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503 } |
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504 |
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505 if (capacity_after_gc < minimum_desired_capacity) { |
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506 // If we have less free space than we want then expand |
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507 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; |
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508 // Don't expand unless it's significant |
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509 if (expand_bytes >= _min_heap_delta_bytes) { |
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510 expand(expand_bytes, 0); // safe if expansion fails |
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511 } |
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512 if (PrintGC && Verbose) { |
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513 gclog_or_tty->print_cr(" expanding:" |
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514 " minimum_desired_capacity: %6.1fK" |
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515 " expand_bytes: %6.1fK" |
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516 " _min_heap_delta_bytes: %6.1fK", |
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517 minimum_desired_capacity / (double) K, |
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518 expand_bytes / (double) K, |
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519 _min_heap_delta_bytes / (double) K); |
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520 } |
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521 return; |
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522 } |
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523 |
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524 // No expansion, now see if we want to shrink |
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525 size_t shrink_bytes = 0; |
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526 // We would never want to shrink more than this |
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527 size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; |
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528 |
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529 if (MaxHeapFreeRatio < 100) { |
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530 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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531 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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532 const double max_tmp = used_after_gc / minimum_used_percentage; |
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533 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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534 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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535 spec()->init_size()); |
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536 if (PrintGC && Verbose) { |
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537 gclog_or_tty->print_cr(" " |
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538 " maximum_free_percentage: %6.2f" |
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539 " minimum_used_percentage: %6.2f", |
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540 maximum_free_percentage, |
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541 minimum_used_percentage); |
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542 gclog_or_tty->print_cr(" " |
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543 " _capacity_at_prologue: %6.1fK" |
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544 " minimum_desired_capacity: %6.1fK" |
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545 " maximum_desired_capacity: %6.1fK", |
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546 _capacity_at_prologue / (double) K, |
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547 minimum_desired_capacity / (double) K, |
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548 maximum_desired_capacity / (double) K); |
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549 } |
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550 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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551 "sanity check"); |
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552 |
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553 if (capacity_after_gc > maximum_desired_capacity) { |
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554 // Capacity too large, compute shrinking size |
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555 shrink_bytes = capacity_after_gc - maximum_desired_capacity; |
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556 // We don't want shrink all the way back to initSize if people call |
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557 // System.gc(), because some programs do that between "phases" and then |
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558 // we'd just have to grow the heap up again for the next phase. So we |
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559 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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560 // on the third call, and 100% by the fourth call. But if we recompute |
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561 // size without shrinking, it goes back to 0%. |
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562 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
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563 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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564 if (current_shrink_factor == 0) { |
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565 _shrink_factor = 10; |
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566 } else { |
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567 _shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); |
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568 } |
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569 if (PrintGC && Verbose) { |
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570 gclog_or_tty->print_cr(" " |
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571 " shrinking:" |
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572 " initSize: %.1fK" |
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573 " maximum_desired_capacity: %.1fK", |
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574 spec()->init_size() / (double) K, |
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575 maximum_desired_capacity / (double) K); |
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576 gclog_or_tty->print_cr(" " |
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577 " shrink_bytes: %.1fK" |
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578 " current_shrink_factor: %d" |
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579 " new shrink factor: %d" |
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580 " _min_heap_delta_bytes: %.1fK", |
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581 shrink_bytes / (double) K, |
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582 current_shrink_factor, |
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583 _shrink_factor, |
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584 _min_heap_delta_bytes / (double) K); |
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585 } |
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586 } |
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587 } |
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588 |
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589 if (capacity_after_gc > _capacity_at_prologue) { |
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590 // We might have expanded for promotions, in which case we might want to |
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591 // take back that expansion if there's room after GC. That keeps us from |
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592 // stretching the heap with promotions when there's plenty of room. |
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593 size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; |
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594 expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); |
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595 // We have two shrinking computations, take the largest |
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596 shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); |
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597 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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598 if (PrintGC && Verbose) { |
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599 gclog_or_tty->print_cr(" " |
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600 " aggressive shrinking:" |
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601 " _capacity_at_prologue: %.1fK" |
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602 " capacity_after_gc: %.1fK" |
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603 " expansion_for_promotion: %.1fK" |
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604 " shrink_bytes: %.1fK", |
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605 capacity_after_gc / (double) K, |
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606 _capacity_at_prologue / (double) K, |
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607 expansion_for_promotion / (double) K, |
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608 shrink_bytes / (double) K); |
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609 } |
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610 } |
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611 // Don't shrink unless it's significant |
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612 if (shrink_bytes >= _min_heap_delta_bytes) { |
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613 shrink(shrink_bytes); |
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614 } |
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615 } |
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616 |
| 0 | 617 // Currently nothing to do. |
| 618 void CardGeneration::prepare_for_verify() {} | |
| 619 | |
| 620 | |
| 621 void OneContigSpaceCardGeneration::collect(bool full, | |
| 622 bool clear_all_soft_refs, | |
| 623 size_t size, | |
| 624 bool is_tlab) { | |
| 10405 | 625 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 626 | |
| 0 | 627 SpecializationStats::clear(); |
| 628 // Temporarily expand the span of our ref processor, so | |
| 629 // refs discovery is over the entire heap, not just this generation | |
| 630 ReferenceProcessorSpanMutator | |
| 10405 | 631 x(ref_processor(), gch->reserved_region()); |
| 632 | |
| 633 STWGCTimer* gc_timer = GenMarkSweep::gc_timer(); | |
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634 gc_timer->register_gc_start(); |
| 10405 | 635 |
| 636 SerialOldTracer* gc_tracer = GenMarkSweep::gc_tracer(); | |
| 637 gc_tracer->report_gc_start(gch->gc_cause(), gc_timer->gc_start()); | |
| 638 | |
| 0 | 639 GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs); |
| 10405 | 640 |
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641 gc_timer->register_gc_end(); |
| 10405 | 642 |
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643 gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions()); |
| 10405 | 644 |
| 0 | 645 SpecializationStats::print(); |
| 646 } | |
| 647 | |
| 648 HeapWord* | |
| 649 OneContigSpaceCardGeneration::expand_and_allocate(size_t word_size, | |
| 650 bool is_tlab, | |
| 651 bool parallel) { | |
| 652 assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation"); | |
| 653 if (parallel) { | |
| 654 MutexLocker x(ParGCRareEvent_lock); | |
| 655 HeapWord* result = NULL; | |
| 656 size_t byte_size = word_size * HeapWordSize; | |
| 657 while (true) { | |
| 658 expand(byte_size, _min_heap_delta_bytes); | |
| 659 if (GCExpandToAllocateDelayMillis > 0) { | |
| 660 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
| 661 } | |
| 662 result = _the_space->par_allocate(word_size); | |
| 663 if ( result != NULL) { | |
| 664 return result; | |
| 665 } else { | |
| 666 // If there's not enough expansion space available, give up. | |
| 667 if (_virtual_space.uncommitted_size() < byte_size) { | |
| 668 return NULL; | |
| 669 } | |
| 670 // else try again | |
| 671 } | |
| 672 } | |
| 673 } else { | |
| 674 expand(word_size*HeapWordSize, _min_heap_delta_bytes); | |
| 675 return _the_space->allocate(word_size); | |
| 676 } | |
| 677 } | |
| 678 | |
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679 bool OneContigSpaceCardGeneration::expand(size_t bytes, size_t expand_bytes) { |
| 0 | 680 GCMutexLocker x(ExpandHeap_lock); |
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681 return CardGeneration::expand(bytes, expand_bytes); |
| 0 | 682 } |
| 683 | |
| 684 | |
| 685 void OneContigSpaceCardGeneration::shrink(size_t bytes) { | |
| 686 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 687 size_t size = ReservedSpace::page_align_size_down(bytes); | |
| 688 if (size > 0) { | |
| 689 shrink_by(size); | |
| 690 } | |
| 691 } | |
| 692 | |
| 693 | |
| 694 size_t OneContigSpaceCardGeneration::capacity() const { | |
| 695 return _the_space->capacity(); | |
| 696 } | |
| 697 | |
| 698 | |
| 699 size_t OneContigSpaceCardGeneration::used() const { | |
| 700 return _the_space->used(); | |
| 701 } | |
| 702 | |
| 703 | |
| 704 size_t OneContigSpaceCardGeneration::free() const { | |
| 705 return _the_space->free(); | |
| 706 } | |
| 707 | |
| 708 MemRegion OneContigSpaceCardGeneration::used_region() const { | |
| 709 return the_space()->used_region(); | |
| 710 } | |
| 711 | |
| 712 size_t OneContigSpaceCardGeneration::unsafe_max_alloc_nogc() const { | |
| 713 return _the_space->free(); | |
| 714 } | |
| 715 | |
| 716 size_t OneContigSpaceCardGeneration::contiguous_available() const { | |
| 717 return _the_space->free() + _virtual_space.uncommitted_size(); | |
| 718 } | |
| 719 | |
| 720 bool OneContigSpaceCardGeneration::grow_by(size_t bytes) { | |
| 721 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 722 bool result = _virtual_space.expand_by(bytes); | |
| 723 if (result) { | |
| 724 size_t new_word_size = | |
| 725 heap_word_size(_virtual_space.committed_size()); | |
| 726 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 727 // Expand card table | |
| 728 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 729 // Expand shared block offset array | |
| 730 _bts->resize(new_word_size); | |
| 731 | |
| 732 // Fix for bug #4668531 | |
|
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733 if (ZapUnusedHeapArea) { |
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734 MemRegion mangle_region(_the_space->end(), |
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735 (HeapWord*)_virtual_space.high()); |
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736 SpaceMangler::mangle_region(mangle_region); |
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737 } |
| 0 | 738 |
| 739 // Expand space -- also expands space's BOT | |
| 740 // (which uses (part of) shared array above) | |
| 741 _the_space->set_end((HeapWord*)_virtual_space.high()); | |
| 742 | |
| 743 // update the space and generation capacity counters | |
| 744 update_counters(); | |
| 745 | |
| 746 if (Verbose && PrintGC) { | |
| 747 size_t new_mem_size = _virtual_space.committed_size(); | |
| 748 size_t old_mem_size = new_mem_size - bytes; | |
| 749 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
| 750 SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 751 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
| 752 } | |
| 753 } | |
| 754 return result; | |
| 755 } | |
| 756 | |
| 757 | |
| 758 bool OneContigSpaceCardGeneration::grow_to_reserved() { | |
| 759 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 760 bool success = true; | |
| 761 const size_t remaining_bytes = _virtual_space.uncommitted_size(); | |
| 762 if (remaining_bytes > 0) { | |
| 763 success = grow_by(remaining_bytes); | |
| 764 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) | |
| 765 } | |
| 766 return success; | |
| 767 } | |
| 768 | |
| 769 void OneContigSpaceCardGeneration::shrink_by(size_t bytes) { | |
| 770 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 771 // Shrink committed space | |
| 772 _virtual_space.shrink_by(bytes); | |
| 773 // Shrink space; this also shrinks the space's BOT | |
| 774 _the_space->set_end((HeapWord*) _virtual_space.high()); | |
| 775 size_t new_word_size = heap_word_size(_the_space->capacity()); | |
| 776 // Shrink the shared block offset array | |
| 777 _bts->resize(new_word_size); | |
| 778 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 779 // Shrink the card table | |
| 780 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 781 | |
| 782 if (Verbose && PrintGC) { | |
| 783 size_t new_mem_size = _virtual_space.committed_size(); | |
| 784 size_t old_mem_size = new_mem_size + bytes; | |
| 785 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 786 name(), old_mem_size/K, new_mem_size/K); | |
| 787 } | |
| 788 } | |
| 789 | |
| 790 // Currently nothing to do. | |
| 791 void OneContigSpaceCardGeneration::prepare_for_verify() {} | |
| 792 | |
| 793 | |
|
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794 // Override for a card-table generation with one contiguous |
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795 // space. NOTE: For reasons that are lost in the fog of history, |
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796 // this code is used when you iterate over perm gen objects, |
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797 // even when one uses CDS, where the perm gen has a couple of |
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798 // other spaces; this is because CompactingPermGenGen derives |
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799 // from OneContigSpaceCardGeneration. This should be cleaned up, |
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800 // see CR 6897789.. |
| 0 | 801 void OneContigSpaceCardGeneration::object_iterate(ObjectClosure* blk) { |
| 802 _the_space->object_iterate(blk); | |
| 803 } | |
| 804 | |
| 805 void OneContigSpaceCardGeneration::space_iterate(SpaceClosure* blk, | |
| 806 bool usedOnly) { | |
| 807 blk->do_space(_the_space); | |
| 808 } | |
| 809 | |
| 810 void OneContigSpaceCardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { | |
| 811 blk->set_generation(this); | |
| 812 younger_refs_in_space_iterate(_the_space, blk); | |
| 813 blk->reset_generation(); | |
| 814 } | |
| 815 | |
| 816 void OneContigSpaceCardGeneration::save_marks() { | |
| 817 _the_space->set_saved_mark(); | |
| 818 } | |
| 819 | |
| 820 | |
| 821 void OneContigSpaceCardGeneration::reset_saved_marks() { | |
| 822 _the_space->reset_saved_mark(); | |
| 823 } | |
| 824 | |
| 825 | |
| 826 bool OneContigSpaceCardGeneration::no_allocs_since_save_marks() { | |
| 827 return _the_space->saved_mark_at_top(); | |
| 828 } | |
| 829 | |
| 830 #define OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 831 \ | |
| 832 void OneContigSpaceCardGeneration:: \ | |
| 833 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
| 834 blk->set_generation(this); \ | |
| 835 _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \ | |
| 836 blk->reset_generation(); \ | |
| 837 save_marks(); \ | |
| 838 } | |
| 839 | |
| 840 ALL_SINCE_SAVE_MARKS_CLOSURES(OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 841 | |
| 842 #undef OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 843 | |
| 844 | |
| 845 void OneContigSpaceCardGeneration::gc_epilogue(bool full) { | |
| 846 _last_gc = WaterMark(the_space(), the_space()->top()); | |
| 847 | |
| 848 // update the generation and space performance counters | |
| 849 update_counters(); | |
|
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850 if (ZapUnusedHeapArea) { |
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851 the_space()->check_mangled_unused_area_complete(); |
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852 } |
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853 } |
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854 |
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855 void OneContigSpaceCardGeneration::record_spaces_top() { |
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856 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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857 the_space()->set_top_for_allocations(); |
| 0 | 858 } |
| 859 | |
| 6008 | 860 void OneContigSpaceCardGeneration::verify() { |
| 861 the_space()->verify(); | |
| 0 | 862 } |
| 863 | |
| 864 void OneContigSpaceCardGeneration::print_on(outputStream* st) const { | |
| 865 Generation::print_on(st); | |
| 866 st->print(" the"); | |
| 867 the_space()->print_on(st); | |
| 868 } |