Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/generation.cpp @ 17937:78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti
| author | drchase |
|---|---|
| date | Thu, 22 May 2014 15:52:41 -0400 |
| parents | 86e6d691f2e1 |
| children | 30c99d8e0f02 |
| 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 MemRegion mr; |
| 302 virtual void do_space(Space* s) { | |
| 303 s->oop_iterate(mr, cl); | |
| 304 } | |
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305 GenerationOopIterateClosure(ExtendedOopClosure* _cl, MemRegion _mr) : |
| 0 | 306 cl(_cl), mr(_mr) {} |
| 307 }; | |
| 308 | |
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309 void Generation::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 310 GenerationOopIterateClosure blk(cl, _reserved); |
| 311 space_iterate(&blk); | |
| 312 } | |
| 313 | |
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314 void Generation::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 0 | 315 GenerationOopIterateClosure blk(cl, mr); |
| 316 space_iterate(&blk); | |
| 317 } | |
| 318 | |
| 319 void Generation::younger_refs_in_space_iterate(Space* sp, | |
| 320 OopsInGenClosure* cl) { | |
| 321 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
| 322 rs->younger_refs_in_space_iterate(sp, cl); | |
| 323 } | |
| 324 | |
| 325 class GenerationObjIterateClosure : public SpaceClosure { | |
| 326 private: | |
| 327 ObjectClosure* _cl; | |
| 328 public: | |
| 329 virtual void do_space(Space* s) { | |
| 330 s->object_iterate(_cl); | |
| 331 } | |
| 332 GenerationObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 333 }; | |
| 334 | |
| 335 void Generation::object_iterate(ObjectClosure* cl) { | |
| 336 GenerationObjIterateClosure blk(cl); | |
| 337 space_iterate(&blk); | |
| 338 } | |
| 339 | |
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340 class GenerationSafeObjIterateClosure : public SpaceClosure { |
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341 private: |
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342 ObjectClosure* _cl; |
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343 public: |
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344 virtual void do_space(Space* s) { |
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345 s->safe_object_iterate(_cl); |
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346 } |
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347 GenerationSafeObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} |
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348 }; |
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349 |
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350 void Generation::safe_object_iterate(ObjectClosure* cl) { |
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351 GenerationSafeObjIterateClosure blk(cl); |
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352 space_iterate(&blk); |
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353 } |
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354 |
| 0 | 355 void Generation::prepare_for_compaction(CompactPoint* cp) { |
| 356 // Generic implementation, can be specialized | |
| 357 CompactibleSpace* space = first_compaction_space(); | |
| 358 while (space != NULL) { | |
| 359 space->prepare_for_compaction(cp); | |
| 360 space = space->next_compaction_space(); | |
| 361 } | |
| 362 } | |
| 363 | |
| 364 class AdjustPointersClosure: public SpaceClosure { | |
| 365 public: | |
| 366 void do_space(Space* sp) { | |
| 367 sp->adjust_pointers(); | |
| 368 } | |
| 369 }; | |
| 370 | |
| 371 void Generation::adjust_pointers() { | |
| 372 // Note that this is done over all spaces, not just the compactible | |
| 373 // ones. | |
| 374 AdjustPointersClosure blk; | |
| 375 space_iterate(&blk, true); | |
| 376 } | |
| 377 | |
| 378 void Generation::compact() { | |
| 379 CompactibleSpace* sp = first_compaction_space(); | |
| 380 while (sp != NULL) { | |
| 381 sp->compact(); | |
| 382 sp = sp->next_compaction_space(); | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, | |
| 387 int level, | |
| 388 GenRemSet* remset) : | |
|
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389 Generation(rs, initial_byte_size, level), _rs(remset), |
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390 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(), |
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391 _used_at_prologue() |
| 0 | 392 { |
| 393 HeapWord* start = (HeapWord*)rs.base(); | |
| 394 size_t reserved_byte_size = rs.size(); | |
| 395 assert((uintptr_t(start) & 3) == 0, "bad alignment"); | |
| 396 assert((reserved_byte_size & 3) == 0, "bad alignment"); | |
| 397 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); | |
| 398 _bts = new BlockOffsetSharedArray(reserved_mr, | |
| 399 heap_word_size(initial_byte_size)); | |
| 400 MemRegion committed_mr(start, heap_word_size(initial_byte_size)); | |
| 401 _rs->resize_covered_region(committed_mr); | |
| 402 if (_bts == NULL) | |
| 403 vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); | |
| 404 | |
| 405 // Verify that the start and end of this generation is the start of a card. | |
| 406 // If this wasn't true, a single card could span more than on generation, | |
| 407 // which would cause problems when we commit/uncommit memory, and when we | |
| 408 // clear and dirty cards. | |
| 409 guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); | |
| 410 if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { | |
| 411 // Don't check at the very end of the heap as we'll assert that we're probing off | |
| 412 // the end if we try. | |
| 413 guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); | |
| 414 } | |
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415 _min_heap_delta_bytes = MinHeapDeltaBytes; |
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416 _capacity_at_prologue = initial_byte_size; |
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417 _used_at_prologue = 0; |
| 0 | 418 } |
| 419 | |
|
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420 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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421 assert_locked_or_safepoint(Heap_lock); |
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422 if (bytes == 0) { |
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423 return true; // That's what grow_by(0) would return |
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424 } |
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425 size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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426 if (aligned_bytes == 0){ |
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427 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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428 // return true with the implication that an expansion was done when it |
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429 // was not. A call to expand implies a best effort to expand by "bytes" |
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430 // but not a guarantee. Align down to give a best effort. This is likely |
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431 // the most that the generation can expand since it has some capacity to |
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432 // start with. |
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433 aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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434 } |
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435 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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436 bool success = false; |
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437 if (aligned_expand_bytes > aligned_bytes) { |
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438 success = grow_by(aligned_expand_bytes); |
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439 } |
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440 if (!success) { |
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441 success = grow_by(aligned_bytes); |
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442 } |
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443 if (!success) { |
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444 success = grow_to_reserved(); |
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445 } |
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446 if (PrintGC && Verbose) { |
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447 if (success && GC_locker::is_active_and_needs_gc()) { |
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448 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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449 } |
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450 } |
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451 |
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452 return success; |
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453 } |
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454 |
| 0 | 455 |
| 456 // No young generation references, clear this generation's cards. | |
| 457 void CardGeneration::clear_remembered_set() { | |
| 458 _rs->clear(reserved()); | |
| 459 } | |
| 460 | |
| 461 | |
| 462 // Objects in this generation may have moved, invalidate this | |
| 463 // generation's cards. | |
| 464 void CardGeneration::invalidate_remembered_set() { | |
| 465 _rs->invalidate(used_region()); | |
| 466 } | |
| 467 | |
| 468 | |
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469 void CardGeneration::compute_new_size() { |
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470 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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471 size_t current_shrink_factor = _shrink_factor; |
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472 _shrink_factor = 0; |
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473 |
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474 // We don't have floating point command-line arguments |
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475 // Note: argument processing ensures that MinHeapFreeRatio < 100. |
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476 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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477 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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478 |
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479 // Compute some numbers about the state of the heap. |
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480 const size_t used_after_gc = used(); |
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481 const size_t capacity_after_gc = capacity(); |
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482 |
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483 const double min_tmp = used_after_gc / maximum_used_percentage; |
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484 size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); |
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485 // Don't shrink less than the initial generation size |
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486 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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487 spec()->init_size()); |
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488 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); |
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489 |
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490 if (PrintGC && Verbose) { |
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491 const size_t free_after_gc = free(); |
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492 const double free_percentage = ((double)free_after_gc) / capacity_after_gc; |
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493 gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); |
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494 gclog_or_tty->print_cr(" " |
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495 " minimum_free_percentage: %6.2f" |
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496 " maximum_used_percentage: %6.2f", |
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497 minimum_free_percentage, |
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498 maximum_used_percentage); |
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499 gclog_or_tty->print_cr(" " |
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500 " free_after_gc : %6.1fK" |
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501 " used_after_gc : %6.1fK" |
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502 " capacity_after_gc : %6.1fK", |
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503 free_after_gc / (double) K, |
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504 used_after_gc / (double) K, |
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505 capacity_after_gc / (double) K); |
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506 gclog_or_tty->print_cr(" " |
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507 " free_percentage: %6.2f", |
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508 free_percentage); |
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509 } |
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510 |
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511 if (capacity_after_gc < minimum_desired_capacity) { |
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512 // If we have less free space than we want then expand |
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513 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; |
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514 // Don't expand unless it's significant |
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515 if (expand_bytes >= _min_heap_delta_bytes) { |
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516 expand(expand_bytes, 0); // safe if expansion fails |
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517 } |
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518 if (PrintGC && Verbose) { |
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519 gclog_or_tty->print_cr(" expanding:" |
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520 " minimum_desired_capacity: %6.1fK" |
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521 " expand_bytes: %6.1fK" |
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522 " _min_heap_delta_bytes: %6.1fK", |
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523 minimum_desired_capacity / (double) K, |
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524 expand_bytes / (double) K, |
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525 _min_heap_delta_bytes / (double) K); |
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526 } |
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527 return; |
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528 } |
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529 |
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530 // No expansion, now see if we want to shrink |
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531 size_t shrink_bytes = 0; |
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532 // We would never want to shrink more than this |
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533 size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; |
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534 |
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535 if (MaxHeapFreeRatio < 100) { |
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536 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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537 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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538 const double max_tmp = used_after_gc / minimum_used_percentage; |
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539 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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540 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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541 spec()->init_size()); |
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542 if (PrintGC && Verbose) { |
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543 gclog_or_tty->print_cr(" " |
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544 " maximum_free_percentage: %6.2f" |
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545 " minimum_used_percentage: %6.2f", |
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546 maximum_free_percentage, |
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547 minimum_used_percentage); |
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548 gclog_or_tty->print_cr(" " |
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549 " _capacity_at_prologue: %6.1fK" |
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550 " minimum_desired_capacity: %6.1fK" |
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551 " maximum_desired_capacity: %6.1fK", |
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552 _capacity_at_prologue / (double) K, |
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553 minimum_desired_capacity / (double) K, |
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554 maximum_desired_capacity / (double) K); |
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555 } |
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556 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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557 "sanity check"); |
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558 |
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559 if (capacity_after_gc > maximum_desired_capacity) { |
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560 // Capacity too large, compute shrinking size |
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561 shrink_bytes = capacity_after_gc - maximum_desired_capacity; |
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562 // We don't want shrink all the way back to initSize if people call |
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563 // System.gc(), because some programs do that between "phases" and then |
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564 // we'd just have to grow the heap up again for the next phase. So we |
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565 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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566 // on the third call, and 100% by the fourth call. But if we recompute |
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567 // size without shrinking, it goes back to 0%. |
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568 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
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569 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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570 if (current_shrink_factor == 0) { |
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571 _shrink_factor = 10; |
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572 } else { |
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573 _shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); |
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574 } |
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575 if (PrintGC && Verbose) { |
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576 gclog_or_tty->print_cr(" " |
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577 " shrinking:" |
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578 " initSize: %.1fK" |
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579 " maximum_desired_capacity: %.1fK", |
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580 spec()->init_size() / (double) K, |
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581 maximum_desired_capacity / (double) K); |
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582 gclog_or_tty->print_cr(" " |
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583 " shrink_bytes: %.1fK" |
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584 " current_shrink_factor: %d" |
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585 " new shrink factor: %d" |
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586 " _min_heap_delta_bytes: %.1fK", |
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587 shrink_bytes / (double) K, |
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588 current_shrink_factor, |
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589 _shrink_factor, |
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590 _min_heap_delta_bytes / (double) K); |
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591 } |
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592 } |
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593 } |
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594 |
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595 if (capacity_after_gc > _capacity_at_prologue) { |
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596 // We might have expanded for promotions, in which case we might want to |
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597 // take back that expansion if there's room after GC. That keeps us from |
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598 // stretching the heap with promotions when there's plenty of room. |
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599 size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; |
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600 expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); |
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601 // We have two shrinking computations, take the largest |
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602 shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); |
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603 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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604 if (PrintGC && Verbose) { |
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605 gclog_or_tty->print_cr(" " |
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606 " aggressive shrinking:" |
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607 " _capacity_at_prologue: %.1fK" |
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608 " capacity_after_gc: %.1fK" |
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609 " expansion_for_promotion: %.1fK" |
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610 " shrink_bytes: %.1fK", |
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611 capacity_after_gc / (double) K, |
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612 _capacity_at_prologue / (double) K, |
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613 expansion_for_promotion / (double) K, |
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614 shrink_bytes / (double) K); |
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615 } |
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616 } |
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617 // Don't shrink unless it's significant |
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618 if (shrink_bytes >= _min_heap_delta_bytes) { |
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619 shrink(shrink_bytes); |
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620 } |
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621 } |
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622 |
| 0 | 623 // Currently nothing to do. |
| 624 void CardGeneration::prepare_for_verify() {} | |
| 625 | |
| 626 | |
| 627 void OneContigSpaceCardGeneration::collect(bool full, | |
| 628 bool clear_all_soft_refs, | |
| 629 size_t size, | |
| 630 bool is_tlab) { | |
| 10405 | 631 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 632 | |
| 0 | 633 SpecializationStats::clear(); |
| 634 // Temporarily expand the span of our ref processor, so | |
| 635 // refs discovery is over the entire heap, not just this generation | |
| 636 ReferenceProcessorSpanMutator | |
| 10405 | 637 x(ref_processor(), gch->reserved_region()); |
| 638 | |
| 639 STWGCTimer* gc_timer = GenMarkSweep::gc_timer(); | |
|
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640 gc_timer->register_gc_start(); |
| 10405 | 641 |
| 642 SerialOldTracer* gc_tracer = GenMarkSweep::gc_tracer(); | |
| 643 gc_tracer->report_gc_start(gch->gc_cause(), gc_timer->gc_start()); | |
| 644 | |
| 0 | 645 GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs); |
| 10405 | 646 |
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647 gc_timer->register_gc_end(); |
| 10405 | 648 |
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649 gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions()); |
| 10405 | 650 |
| 0 | 651 SpecializationStats::print(); |
| 652 } | |
| 653 | |
| 654 HeapWord* | |
| 655 OneContigSpaceCardGeneration::expand_and_allocate(size_t word_size, | |
| 656 bool is_tlab, | |
| 657 bool parallel) { | |
| 658 assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation"); | |
| 659 if (parallel) { | |
| 660 MutexLocker x(ParGCRareEvent_lock); | |
| 661 HeapWord* result = NULL; | |
| 662 size_t byte_size = word_size * HeapWordSize; | |
| 663 while (true) { | |
| 664 expand(byte_size, _min_heap_delta_bytes); | |
| 665 if (GCExpandToAllocateDelayMillis > 0) { | |
| 666 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
| 667 } | |
| 668 result = _the_space->par_allocate(word_size); | |
| 669 if ( result != NULL) { | |
| 670 return result; | |
| 671 } else { | |
| 672 // If there's not enough expansion space available, give up. | |
| 673 if (_virtual_space.uncommitted_size() < byte_size) { | |
| 674 return NULL; | |
| 675 } | |
| 676 // else try again | |
| 677 } | |
| 678 } | |
| 679 } else { | |
| 680 expand(word_size*HeapWordSize, _min_heap_delta_bytes); | |
| 681 return _the_space->allocate(word_size); | |
| 682 } | |
| 683 } | |
| 684 | |
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685 bool OneContigSpaceCardGeneration::expand(size_t bytes, size_t expand_bytes) { |
| 0 | 686 GCMutexLocker x(ExpandHeap_lock); |
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687 return CardGeneration::expand(bytes, expand_bytes); |
| 0 | 688 } |
| 689 | |
| 690 | |
| 691 void OneContigSpaceCardGeneration::shrink(size_t bytes) { | |
| 692 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 693 size_t size = ReservedSpace::page_align_size_down(bytes); | |
| 694 if (size > 0) { | |
| 695 shrink_by(size); | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 | |
| 700 size_t OneContigSpaceCardGeneration::capacity() const { | |
| 701 return _the_space->capacity(); | |
| 702 } | |
| 703 | |
| 704 | |
| 705 size_t OneContigSpaceCardGeneration::used() const { | |
| 706 return _the_space->used(); | |
| 707 } | |
| 708 | |
| 709 | |
| 710 size_t OneContigSpaceCardGeneration::free() const { | |
| 711 return _the_space->free(); | |
| 712 } | |
| 713 | |
| 714 MemRegion OneContigSpaceCardGeneration::used_region() const { | |
| 715 return the_space()->used_region(); | |
| 716 } | |
| 717 | |
| 718 size_t OneContigSpaceCardGeneration::unsafe_max_alloc_nogc() const { | |
| 719 return _the_space->free(); | |
| 720 } | |
| 721 | |
| 722 size_t OneContigSpaceCardGeneration::contiguous_available() const { | |
| 723 return _the_space->free() + _virtual_space.uncommitted_size(); | |
| 724 } | |
| 725 | |
| 726 bool OneContigSpaceCardGeneration::grow_by(size_t bytes) { | |
| 727 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 728 bool result = _virtual_space.expand_by(bytes); | |
| 729 if (result) { | |
| 730 size_t new_word_size = | |
| 731 heap_word_size(_virtual_space.committed_size()); | |
| 732 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 733 // Expand card table | |
| 734 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 735 // Expand shared block offset array | |
| 736 _bts->resize(new_word_size); | |
| 737 | |
| 738 // Fix for bug #4668531 | |
|
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739 if (ZapUnusedHeapArea) { |
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740 MemRegion mangle_region(_the_space->end(), |
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741 (HeapWord*)_virtual_space.high()); |
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742 SpaceMangler::mangle_region(mangle_region); |
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743 } |
| 0 | 744 |
| 745 // Expand space -- also expands space's BOT | |
| 746 // (which uses (part of) shared array above) | |
| 747 _the_space->set_end((HeapWord*)_virtual_space.high()); | |
| 748 | |
| 749 // update the space and generation capacity counters | |
| 750 update_counters(); | |
| 751 | |
| 752 if (Verbose && PrintGC) { | |
| 753 size_t new_mem_size = _virtual_space.committed_size(); | |
| 754 size_t old_mem_size = new_mem_size - bytes; | |
| 755 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
| 756 SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 757 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
| 758 } | |
| 759 } | |
| 760 return result; | |
| 761 } | |
| 762 | |
| 763 | |
| 764 bool OneContigSpaceCardGeneration::grow_to_reserved() { | |
| 765 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 766 bool success = true; | |
| 767 const size_t remaining_bytes = _virtual_space.uncommitted_size(); | |
| 768 if (remaining_bytes > 0) { | |
| 769 success = grow_by(remaining_bytes); | |
| 770 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) | |
| 771 } | |
| 772 return success; | |
| 773 } | |
| 774 | |
| 775 void OneContigSpaceCardGeneration::shrink_by(size_t bytes) { | |
| 776 assert_locked_or_safepoint(ExpandHeap_lock); | |
| 777 // Shrink committed space | |
| 778 _virtual_space.shrink_by(bytes); | |
| 779 // Shrink space; this also shrinks the space's BOT | |
| 780 _the_space->set_end((HeapWord*) _virtual_space.high()); | |
| 781 size_t new_word_size = heap_word_size(_the_space->capacity()); | |
| 782 // Shrink the shared block offset array | |
| 783 _bts->resize(new_word_size); | |
| 784 MemRegion mr(_the_space->bottom(), new_word_size); | |
| 785 // Shrink the card table | |
| 786 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
| 787 | |
| 788 if (Verbose && PrintGC) { | |
| 789 size_t new_mem_size = _virtual_space.committed_size(); | |
| 790 size_t old_mem_size = new_mem_size + bytes; | |
| 791 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
| 792 name(), old_mem_size/K, new_mem_size/K); | |
| 793 } | |
| 794 } | |
| 795 | |
| 796 // Currently nothing to do. | |
| 797 void OneContigSpaceCardGeneration::prepare_for_verify() {} | |
| 798 | |
| 799 | |
|
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800 // Override for a card-table generation with one contiguous |
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801 // space. NOTE: For reasons that are lost in the fog of history, |
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802 // this code is used when you iterate over perm gen objects, |
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803 // even when one uses CDS, where the perm gen has a couple of |
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804 // other spaces; this is because CompactingPermGenGen derives |
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805 // from OneContigSpaceCardGeneration. This should be cleaned up, |
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806 // see CR 6897789.. |
| 0 | 807 void OneContigSpaceCardGeneration::object_iterate(ObjectClosure* blk) { |
| 808 _the_space->object_iterate(blk); | |
| 809 } | |
| 810 | |
| 811 void OneContigSpaceCardGeneration::space_iterate(SpaceClosure* blk, | |
| 812 bool usedOnly) { | |
| 813 blk->do_space(_the_space); | |
| 814 } | |
| 815 | |
| 816 void OneContigSpaceCardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { | |
| 817 blk->set_generation(this); | |
| 818 younger_refs_in_space_iterate(_the_space, blk); | |
| 819 blk->reset_generation(); | |
| 820 } | |
| 821 | |
| 822 void OneContigSpaceCardGeneration::save_marks() { | |
| 823 _the_space->set_saved_mark(); | |
| 824 } | |
| 825 | |
| 826 | |
| 827 void OneContigSpaceCardGeneration::reset_saved_marks() { | |
| 828 _the_space->reset_saved_mark(); | |
| 829 } | |
| 830 | |
| 831 | |
| 832 bool OneContigSpaceCardGeneration::no_allocs_since_save_marks() { | |
| 833 return _the_space->saved_mark_at_top(); | |
| 834 } | |
| 835 | |
| 836 #define OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
| 837 \ | |
| 838 void OneContigSpaceCardGeneration:: \ | |
| 839 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
| 840 blk->set_generation(this); \ | |
| 841 _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \ | |
| 842 blk->reset_generation(); \ | |
| 843 save_marks(); \ | |
| 844 } | |
| 845 | |
| 846 ALL_SINCE_SAVE_MARKS_CLOSURES(OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
| 847 | |
| 848 #undef OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN | |
| 849 | |
| 850 | |
| 851 void OneContigSpaceCardGeneration::gc_epilogue(bool full) { | |
| 852 _last_gc = WaterMark(the_space(), the_space()->top()); | |
| 853 | |
| 854 // update the generation and space performance counters | |
| 855 update_counters(); | |
|
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856 if (ZapUnusedHeapArea) { |
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857 the_space()->check_mangled_unused_area_complete(); |
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858 } |
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859 } |
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860 |
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861 void OneContigSpaceCardGeneration::record_spaces_top() { |
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862 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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863 the_space()->set_top_for_allocations(); |
| 0 | 864 } |
| 865 | |
| 6008 | 866 void OneContigSpaceCardGeneration::verify() { |
| 867 the_space()->verify(); | |
| 0 | 868 } |
| 869 | |
| 870 void OneContigSpaceCardGeneration::print_on(outputStream* st) const { | |
| 871 Generation::print_on(st); | |
| 872 st->print(" the"); | |
| 873 the_space()->print_on(st); | |
| 874 } |