Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp @ 3322:567c87d484a0
7041501: NUMA: Expand the old gen more aggressively
Summary: Expand the old gen in bigger increments
Reviewed-by: jmasa
| author | iveresov |
|---|---|
| date | Wed, 04 May 2011 15:08:44 -0700 |
| parents | eda9eb483d29 |
| children | c9ca3f51cf41 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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" |
| 26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
| 30 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 31 #include "memory/cardTableModRefBS.hpp" | |
| 32 #include "memory/gcLocker.inline.hpp" | |
| 33 #include "oops/oop.inline.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 0 | 35 |
| 36 inline const char* PSOldGen::select_name() { | |
| 37 return UseParallelOldGC ? "ParOldGen" : "PSOldGen"; | |
| 38 } | |
| 39 | |
| 40 PSOldGen::PSOldGen(ReservedSpace rs, size_t alignment, | |
| 41 size_t initial_size, size_t min_size, size_t max_size, | |
| 42 const char* perf_data_name, int level): | |
| 43 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
| 44 _max_gen_size(max_size) | |
| 45 { | |
| 46 initialize(rs, alignment, perf_data_name, level); | |
| 47 } | |
| 48 | |
| 49 PSOldGen::PSOldGen(size_t initial_size, | |
| 50 size_t min_size, size_t max_size, | |
| 51 const char* perf_data_name, int level): | |
| 52 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
| 53 _max_gen_size(max_size) | |
| 54 {} | |
| 55 | |
| 56 void PSOldGen::initialize(ReservedSpace rs, size_t alignment, | |
| 57 const char* perf_data_name, int level) { | |
| 58 initialize_virtual_space(rs, alignment); | |
| 59 initialize_work(perf_data_name, level); | |
| 60 // The old gen can grow to gen_size_limit(). _reserve reflects only | |
| 61 // the current maximum that can be committed. | |
| 62 assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); | |
| 63 } | |
| 64 | |
| 65 void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
| 66 | |
| 67 _virtual_space = new PSVirtualSpace(rs, alignment); | |
| 68 if (!_virtual_space->expand_by(_init_gen_size)) { | |
| 69 vm_exit_during_initialization("Could not reserve enough space for " | |
| 70 "object heap"); | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 void PSOldGen::initialize_work(const char* perf_data_name, int level) { | |
| 75 // | |
| 76 // Basic memory initialization | |
| 77 // | |
| 78 | |
| 79 MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), | |
| 80 heap_word_size(_max_gen_size)); | |
| 81 assert(limit_reserved.byte_size() == _max_gen_size, | |
| 82 "word vs bytes confusion"); | |
| 83 // | |
| 84 // Object start stuff | |
| 85 // | |
| 86 | |
| 87 start_array()->initialize(limit_reserved); | |
| 88 | |
| 89 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
| 90 (HeapWord*)virtual_space()->high_boundary()); | |
| 91 | |
| 92 // | |
| 93 // Card table stuff | |
| 94 // | |
| 95 | |
| 96 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
| 97 (HeapWord*)virtual_space()->high()); | |
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98 if (ZapUnusedHeapArea) { |
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99 // Mangle newly committed space immediately rather than |
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100 // waiting for the initialization of the space even though |
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101 // mangling is related to spaces. Doing it here eliminates |
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102 // the need to carry along information that a complete mangling |
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103 // (bottom to end) needs to be done. |
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104 SpaceMangler::mangle_region(cmr); |
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105 } |
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106 |
| 0 | 107 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
| 108 | |
| 109 CardTableModRefBS* _ct = (CardTableModRefBS*)Universe::heap()->barrier_set(); | |
| 110 assert (_ct->kind() == BarrierSet::CardTableModRef, "Sanity"); | |
| 111 | |
| 112 // Verify that the start and end of this generation is the start of a card. | |
| 113 // If this wasn't true, a single card could span more than one generation, | |
| 114 // which would cause problems when we commit/uncommit memory, and when we | |
| 115 // clear and dirty cards. | |
| 116 guarantee(_ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); | |
| 117 if (_reserved.end() != Universe::heap()->reserved_region().end()) { | |
| 118 // Don't check at the very end of the heap as we'll assert that we're probing off | |
| 119 // the end if we try. | |
| 120 guarantee(_ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); | |
| 121 } | |
| 122 | |
| 123 // | |
| 124 // ObjectSpace stuff | |
| 125 // | |
| 126 | |
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127 _object_space = new MutableSpace(virtual_space()->alignment()); |
| 0 | 128 |
| 129 if (_object_space == NULL) | |
| 130 vm_exit_during_initialization("Could not allocate an old gen space"); | |
| 131 | |
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132 object_space()->initialize(cmr, |
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133 SpaceDecorator::Clear, |
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134 SpaceDecorator::Mangle); |
| 0 | 135 |
| 136 _object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); | |
| 137 | |
| 138 if (_object_mark_sweep == NULL) | |
| 139 vm_exit_during_initialization("Could not complete allocation of old generation"); | |
| 140 | |
| 141 // Update the start_array | |
| 142 start_array()->set_covered_region(cmr); | |
| 143 | |
| 144 // Generation Counters, generation 'level', 1 subspace | |
| 145 _gen_counters = new PSGenerationCounters(perf_data_name, level, 1, | |
| 146 virtual_space()); | |
| 147 _space_counters = new SpaceCounters(perf_data_name, 0, | |
| 148 virtual_space()->reserved_size(), | |
| 149 _object_space, _gen_counters); | |
| 150 } | |
| 151 | |
| 152 // Assume that the generation has been allocated if its | |
| 153 // reserved size is not 0. | |
| 154 bool PSOldGen::is_allocated() { | |
| 155 return virtual_space()->reserved_size() != 0; | |
| 156 } | |
| 157 | |
| 158 void PSOldGen::precompact() { | |
| 159 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 160 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 161 | |
| 162 // Reset start array first. | |
| 163 start_array()->reset(); | |
| 164 | |
| 165 object_mark_sweep()->precompact(); | |
| 166 | |
| 167 // Now compact the young gen | |
| 168 heap->young_gen()->precompact(); | |
| 169 } | |
| 170 | |
| 171 void PSOldGen::adjust_pointers() { | |
| 172 object_mark_sweep()->adjust_pointers(); | |
| 173 } | |
| 174 | |
| 175 void PSOldGen::compact() { | |
| 176 object_mark_sweep()->compact(ZapUnusedHeapArea); | |
| 177 } | |
| 178 | |
| 179 size_t PSOldGen::contiguous_available() const { | |
| 180 return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); | |
| 181 } | |
| 182 | |
| 183 // Allocation. We report all successful allocations to the size policy | |
| 184 // Note that the perm gen does not use this method, and should not! | |
| 185 HeapWord* PSOldGen::allocate(size_t word_size, bool is_tlab) { | |
| 186 assert_locked_or_safepoint(Heap_lock); | |
| 187 HeapWord* res = allocate_noexpand(word_size, is_tlab); | |
| 188 | |
| 189 if (res == NULL) { | |
| 190 res = expand_and_allocate(word_size, is_tlab); | |
| 191 } | |
| 192 | |
| 193 // Allocations in the old generation need to be reported | |
| 194 if (res != NULL) { | |
| 195 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 196 heap->size_policy()->tenured_allocation(word_size); | |
| 197 } | |
| 198 | |
| 199 return res; | |
| 200 } | |
| 201 | |
| 202 HeapWord* PSOldGen::expand_and_allocate(size_t word_size, bool is_tlab) { | |
| 203 assert(!is_tlab, "TLAB's are not supported in PSOldGen"); | |
| 204 expand(word_size*HeapWordSize); | |
| 205 if (GCExpandToAllocateDelayMillis > 0) { | |
| 206 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
| 207 } | |
| 208 return allocate_noexpand(word_size, is_tlab); | |
| 209 } | |
| 210 | |
| 211 HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { | |
| 212 expand(word_size*HeapWordSize); | |
| 213 if (GCExpandToAllocateDelayMillis > 0) { | |
| 214 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
| 215 } | |
| 216 return cas_allocate_noexpand(word_size); | |
| 217 } | |
| 218 | |
| 219 void PSOldGen::expand(size_t bytes) { | |
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220 if (bytes == 0) { |
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221 return; |
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222 } |
| 0 | 223 MutexLocker x(ExpandHeap_lock); |
| 224 const size_t alignment = virtual_space()->alignment(); | |
| 225 size_t aligned_bytes = align_size_up(bytes, alignment); | |
| 226 size_t aligned_expand_bytes = align_size_up(MinHeapDeltaBytes, alignment); | |
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227 |
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228 if (UseNUMA) { |
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229 // With NUMA we use round-robin page allocation for the old gen. Expand by at least |
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230 // providing a page per lgroup. Alignment is larger or equal to the page size. |
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231 aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
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232 } |
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233 if (aligned_bytes == 0){ |
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234 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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235 // return true with the implication that and expansion was done when it |
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236 // was not. A call to expand implies a best effort to expand by "bytes" |
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237 // but not a guarantee. Align down to give a best effort. This is likely |
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238 // the most that the generation can expand since it has some capacity to |
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239 // start with. |
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240 aligned_bytes = align_size_down(bytes, alignment); |
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241 } |
| 0 | 242 |
| 243 bool success = false; | |
| 244 if (aligned_expand_bytes > aligned_bytes) { | |
| 245 success = expand_by(aligned_expand_bytes); | |
| 246 } | |
| 247 if (!success) { | |
| 248 success = expand_by(aligned_bytes); | |
| 249 } | |
| 250 if (!success) { | |
| 251 success = expand_to_reserved(); | |
| 252 } | |
| 253 | |
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254 if (PrintGC && Verbose) { |
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255 if (success && GC_locker::is_active()) { |
| 0 | 256 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
| 257 } | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 bool PSOldGen::expand_by(size_t bytes) { | |
| 262 assert_lock_strong(ExpandHeap_lock); | |
| 263 assert_locked_or_safepoint(Heap_lock); | |
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264 if (bytes == 0) { |
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265 return true; // That's what virtual_space()->expand_by(0) would return |
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266 } |
| 0 | 267 bool result = virtual_space()->expand_by(bytes); |
| 268 if (result) { | |
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269 if (ZapUnusedHeapArea) { |
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270 // We need to mangle the newly expanded area. The memregion spans |
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271 // end -> new_end, we assume that top -> end is already mangled. |
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272 // Do the mangling before post_resize() is called because |
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273 // the space is available for allocation after post_resize(); |
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274 HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
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275 assert(object_space()->end() < virtual_space_high, |
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276 "Should be true before post_resize()"); |
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277 MemRegion mangle_region(object_space()->end(), virtual_space_high); |
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278 // Note that the object space has not yet been updated to |
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279 // coincede with the new underlying virtual space. |
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280 SpaceMangler::mangle_region(mangle_region); |
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281 } |
| 0 | 282 post_resize(); |
| 283 if (UsePerfData) { | |
| 284 _space_counters->update_capacity(); | |
| 285 _gen_counters->update_all(); | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 if (result && Verbose && PrintGC) { | |
| 290 size_t new_mem_size = virtual_space()->committed_size(); | |
| 291 size_t old_mem_size = new_mem_size - bytes; | |
| 292 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
| 293 SIZE_FORMAT "K to " | |
| 294 SIZE_FORMAT "K", | |
| 295 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
| 296 } | |
| 297 | |
| 298 return result; | |
| 299 } | |
| 300 | |
| 301 bool PSOldGen::expand_to_reserved() { | |
| 302 assert_lock_strong(ExpandHeap_lock); | |
| 303 assert_locked_or_safepoint(Heap_lock); | |
| 304 | |
| 305 bool result = true; | |
| 306 const size_t remaining_bytes = virtual_space()->uncommitted_size(); | |
| 307 if (remaining_bytes > 0) { | |
| 308 result = expand_by(remaining_bytes); | |
| 309 DEBUG_ONLY(if (!result) warning("grow to reserve failed")); | |
| 310 } | |
| 311 return result; | |
| 312 } | |
| 313 | |
| 314 void PSOldGen::shrink(size_t bytes) { | |
| 315 assert_lock_strong(ExpandHeap_lock); | |
| 316 assert_locked_or_safepoint(Heap_lock); | |
| 317 | |
| 318 size_t size = align_size_down(bytes, virtual_space()->alignment()); | |
| 319 if (size > 0) { | |
| 320 assert_lock_strong(ExpandHeap_lock); | |
| 321 virtual_space()->shrink_by(bytes); | |
| 322 post_resize(); | |
| 323 | |
| 324 if (Verbose && PrintGC) { | |
| 325 size_t new_mem_size = virtual_space()->committed_size(); | |
| 326 size_t old_mem_size = new_mem_size + bytes; | |
| 327 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by " | |
| 328 SIZE_FORMAT "K to " | |
| 329 SIZE_FORMAT "K", | |
| 330 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
| 331 } | |
| 332 } | |
| 333 } | |
| 334 | |
| 335 void PSOldGen::resize(size_t desired_free_space) { | |
| 336 const size_t alignment = virtual_space()->alignment(); | |
| 337 const size_t size_before = virtual_space()->committed_size(); | |
| 338 size_t new_size = used_in_bytes() + desired_free_space; | |
| 339 if (new_size < used_in_bytes()) { | |
| 340 // Overflowed the addition. | |
| 341 new_size = gen_size_limit(); | |
| 342 } | |
| 343 // Adjust according to our min and max | |
| 344 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); | |
| 345 | |
| 346 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); | |
| 347 new_size = align_size_up(new_size, alignment); | |
| 348 | |
| 349 const size_t current_size = capacity_in_bytes(); | |
| 350 | |
| 351 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 352 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
| 353 "desired free: " SIZE_FORMAT " used: " SIZE_FORMAT | |
| 354 " new size: " SIZE_FORMAT " current size " SIZE_FORMAT | |
| 355 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
| 356 desired_free_space, used_in_bytes(), new_size, current_size, | |
| 357 gen_size_limit(), min_gen_size()); | |
| 358 } | |
| 359 | |
| 360 if (new_size == current_size) { | |
| 361 // No change requested | |
| 362 return; | |
| 363 } | |
| 364 if (new_size > current_size) { | |
| 365 size_t change_bytes = new_size - current_size; | |
| 366 expand(change_bytes); | |
| 367 } else { | |
| 368 size_t change_bytes = current_size - new_size; | |
| 369 // shrink doesn't grab this lock, expand does. Is that right? | |
| 370 MutexLocker x(ExpandHeap_lock); | |
| 371 shrink(change_bytes); | |
| 372 } | |
| 373 | |
| 374 if (PrintAdaptiveSizePolicy) { | |
| 375 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 376 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 377 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
| 378 "collection: %d " | |
| 379 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
| 380 heap->total_collections(), | |
| 381 size_before, virtual_space()->committed_size()); | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 // NOTE! We need to be careful about resizing. During a GC, multiple | |
| 386 // allocators may be active during heap expansion. If we allow the | |
| 387 // heap resizing to become visible before we have correctly resized | |
| 388 // all heap related data structures, we may cause program failures. | |
| 389 void PSOldGen::post_resize() { | |
| 390 // First construct a memregion representing the new size | |
| 391 MemRegion new_memregion((HeapWord*)virtual_space()->low(), | |
| 392 (HeapWord*)virtual_space()->high()); | |
| 393 size_t new_word_size = new_memregion.word_size(); | |
| 394 | |
| 395 start_array()->set_covered_region(new_memregion); | |
| 396 Universe::heap()->barrier_set()->resize_covered_region(new_memregion); | |
| 397 | |
| 398 // ALWAYS do this last!! | |
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399 object_space()->initialize(new_memregion, |
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400 SpaceDecorator::DontClear, |
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401 SpaceDecorator::DontMangle); |
| 0 | 402 |
| 403 assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), | |
| 404 "Sanity"); | |
| 405 } | |
| 406 | |
| 407 size_t PSOldGen::gen_size_limit() { | |
| 408 return _max_gen_size; | |
| 409 } | |
| 410 | |
| 411 void PSOldGen::reset_after_change() { | |
| 412 ShouldNotReachHere(); | |
| 413 return; | |
| 414 } | |
| 415 | |
| 416 size_t PSOldGen::available_for_expansion() { | |
| 417 ShouldNotReachHere(); | |
| 418 return 0; | |
| 419 } | |
| 420 | |
| 421 size_t PSOldGen::available_for_contraction() { | |
| 422 ShouldNotReachHere(); | |
| 423 return 0; | |
| 424 } | |
| 425 | |
| 426 void PSOldGen::print() const { print_on(tty);} | |
| 427 void PSOldGen::print_on(outputStream* st) const { | |
| 428 st->print(" %-15s", name()); | |
| 429 if (PrintGCDetails && Verbose) { | |
| 430 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
| 431 capacity_in_bytes(), used_in_bytes()); | |
| 432 } else { | |
| 433 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
| 434 capacity_in_bytes()/K, used_in_bytes()/K); | |
| 435 } | |
| 436 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 437 virtual_space()->low_boundary(), | |
| 438 virtual_space()->high(), | |
| 439 virtual_space()->high_boundary()); | |
| 440 | |
| 441 st->print(" object"); object_space()->print_on(st); | |
| 442 } | |
| 443 | |
| 444 void PSOldGen::print_used_change(size_t prev_used) const { | |
| 445 gclog_or_tty->print(" [%s:", name()); | |
| 446 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 447 "->" SIZE_FORMAT "K" | |
| 448 "(" SIZE_FORMAT "K)", | |
| 449 prev_used / K, used_in_bytes() / K, | |
| 450 capacity_in_bytes() / K); | |
| 451 gclog_or_tty->print("]"); | |
| 452 } | |
| 453 | |
| 454 void PSOldGen::update_counters() { | |
| 455 if (UsePerfData) { | |
| 456 _space_counters->update_all(); | |
| 457 _gen_counters->update_all(); | |
| 458 } | |
| 459 } | |
| 460 | |
| 461 #ifndef PRODUCT | |
| 462 | |
| 463 void PSOldGen::space_invariants() { | |
| 464 assert(object_space()->end() == (HeapWord*) virtual_space()->high(), | |
| 465 "Space invariant"); | |
| 466 assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), | |
| 467 "Space invariant"); | |
| 468 assert(virtual_space()->low_boundary() <= virtual_space()->low(), | |
| 469 "Space invariant"); | |
| 470 assert(virtual_space()->high_boundary() >= virtual_space()->high(), | |
| 471 "Space invariant"); | |
| 472 assert(virtual_space()->low_boundary() == (char*) _reserved.start(), | |
| 473 "Space invariant"); | |
| 474 assert(virtual_space()->high_boundary() == (char*) _reserved.end(), | |
| 475 "Space invariant"); | |
| 476 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
| 477 "Space invariant"); | |
| 478 } | |
| 479 #endif | |
| 480 | |
| 481 void PSOldGen::verify(bool allow_dirty) { | |
| 482 object_space()->verify(allow_dirty); | |
| 483 } | |
| 484 class VerifyObjectStartArrayClosure : public ObjectClosure { | |
| 485 PSOldGen* _gen; | |
| 486 ObjectStartArray* _start_array; | |
| 487 | |
| 488 public: | |
| 489 VerifyObjectStartArrayClosure(PSOldGen* gen, ObjectStartArray* start_array) : | |
| 490 _gen(gen), _start_array(start_array) { } | |
| 491 | |
| 492 virtual void do_object(oop obj) { | |
| 493 HeapWord* test_addr = (HeapWord*)obj + 1; | |
| 494 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); | |
| 495 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); | |
| 496 } | |
| 497 }; | |
| 498 | |
| 499 void PSOldGen::verify_object_start_array() { | |
| 500 VerifyObjectStartArrayClosure check( this, &_start_array ); | |
| 501 object_iterate(&check); | |
| 502 } | |
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503 |
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504 #ifndef PRODUCT |
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505 void PSOldGen::record_spaces_top() { |
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506 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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507 object_space()->set_top_for_allocations(); |
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508 } |
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509 #endif |