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annotate src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | eda9eb483d29 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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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/psMarkSweepDecorator.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
| 30 #include "gc_implementation/shared/gcUtil.hpp" | |
| 31 #include "gc_implementation/shared/mutableNUMASpace.hpp" | |
| 32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 33 #include "oops/oop.inline.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 0 | 35 |
| 36 PSYoungGen::PSYoungGen(size_t initial_size, | |
| 37 size_t min_size, | |
| 38 size_t max_size) : | |
| 39 _init_gen_size(initial_size), | |
| 40 _min_gen_size(min_size), | |
| 41 _max_gen_size(max_size) | |
| 42 {} | |
| 43 | |
| 44 void PSYoungGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
| 45 assert(_init_gen_size != 0, "Should have a finite size"); | |
| 46 _virtual_space = new PSVirtualSpace(rs, alignment); | |
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47 if (!virtual_space()->expand_by(_init_gen_size)) { |
| 0 | 48 vm_exit_during_initialization("Could not reserve enough space for " |
| 49 "object heap"); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 void PSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
| 54 initialize_virtual_space(rs, alignment); | |
| 55 initialize_work(); | |
| 56 } | |
| 57 | |
| 58 void PSYoungGen::initialize_work() { | |
| 59 | |
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60 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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61 (HeapWord*)virtual_space()->high_boundary()); |
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62 |
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63 MemRegion cmr((HeapWord*)virtual_space()->low(), |
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64 (HeapWord*)virtual_space()->high()); |
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65 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
| 0 | 66 |
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67 if (ZapUnusedHeapArea) { |
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68 // Mangle newly committed space immediately because it |
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69 // can be done here more simply that after the new |
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70 // spaces have been computed. |
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71 SpaceMangler::mangle_region(cmr); |
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72 } |
| 0 | 73 |
| 74 if (UseNUMA) { | |
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75 _eden_space = new MutableNUMASpace(virtual_space()->alignment()); |
| 0 | 76 } else { |
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77 _eden_space = new MutableSpace(virtual_space()->alignment()); |
| 0 | 78 } |
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79 _from_space = new MutableSpace(virtual_space()->alignment()); |
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80 _to_space = new MutableSpace(virtual_space()->alignment()); |
| 0 | 81 |
| 82 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { | |
| 83 vm_exit_during_initialization("Could not allocate a young gen space"); | |
| 84 } | |
| 85 | |
| 86 // Allocate the mark sweep views of spaces | |
| 87 _eden_mark_sweep = | |
| 88 new PSMarkSweepDecorator(_eden_space, NULL, MarkSweepDeadRatio); | |
| 89 _from_mark_sweep = | |
| 90 new PSMarkSweepDecorator(_from_space, NULL, MarkSweepDeadRatio); | |
| 91 _to_mark_sweep = | |
| 92 new PSMarkSweepDecorator(_to_space, NULL, MarkSweepDeadRatio); | |
| 93 | |
| 94 if (_eden_mark_sweep == NULL || | |
| 95 _from_mark_sweep == NULL || | |
| 96 _to_mark_sweep == NULL) { | |
| 97 vm_exit_during_initialization("Could not complete allocation" | |
| 98 " of the young generation"); | |
| 99 } | |
| 100 | |
| 101 // Generation Counters - generation 0, 3 subspaces | |
| 102 _gen_counters = new PSGenerationCounters("new", 0, 3, _virtual_space); | |
| 103 | |
| 104 // Compute maximum space sizes for performance counters | |
| 105 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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106 size_t alignment = heap->intra_heap_alignment(); |
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107 size_t size = virtual_space()->reserved_size(); |
| 0 | 108 |
| 109 size_t max_survivor_size; | |
| 110 size_t max_eden_size; | |
| 111 | |
| 112 if (UseAdaptiveSizePolicy) { | |
| 113 max_survivor_size = size / MinSurvivorRatio; | |
| 114 | |
| 115 // round the survivor space size down to the nearest alignment | |
| 116 // and make sure its size is greater than 0. | |
| 117 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
| 118 max_survivor_size = MAX2(max_survivor_size, alignment); | |
| 119 | |
| 120 // set the maximum size of eden to be the size of the young gen | |
| 121 // less two times the minimum survivor size. The minimum survivor | |
| 122 // size for UseAdaptiveSizePolicy is one alignment. | |
| 123 max_eden_size = size - 2 * alignment; | |
| 124 } else { | |
| 125 max_survivor_size = size / InitialSurvivorRatio; | |
| 126 | |
| 127 // round the survivor space size down to the nearest alignment | |
| 128 // and make sure its size is greater than 0. | |
| 129 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
| 130 max_survivor_size = MAX2(max_survivor_size, alignment); | |
| 131 | |
| 132 // set the maximum size of eden to be the size of the young gen | |
| 133 // less two times the survivor size when the generation is 100% | |
| 134 // committed. The minimum survivor size for -UseAdaptiveSizePolicy | |
| 135 // is dependent on the committed portion (current capacity) of the | |
| 136 // generation - the less space committed, the smaller the survivor | |
| 137 // space, possibly as small as an alignment. However, we are interested | |
| 138 // in the case where the young generation is 100% committed, as this | |
| 139 // is the point where eden reachs its maximum size. At this point, | |
| 140 // the size of a survivor space is max_survivor_size. | |
| 141 max_eden_size = size - 2 * max_survivor_size; | |
| 142 } | |
| 143 | |
| 144 _eden_counters = new SpaceCounters("eden", 0, max_eden_size, _eden_space, | |
| 145 _gen_counters); | |
| 146 _from_counters = new SpaceCounters("s0", 1, max_survivor_size, _from_space, | |
| 147 _gen_counters); | |
| 148 _to_counters = new SpaceCounters("s1", 2, max_survivor_size, _to_space, | |
| 149 _gen_counters); | |
| 150 | |
| 151 compute_initial_space_boundaries(); | |
| 152 } | |
| 153 | |
| 154 void PSYoungGen::compute_initial_space_boundaries() { | |
| 155 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 156 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 157 | |
| 158 // Compute sizes | |
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159 size_t alignment = heap->intra_heap_alignment(); |
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160 size_t size = virtual_space()->committed_size(); |
| 0 | 161 |
| 162 size_t survivor_size = size / InitialSurvivorRatio; | |
| 163 survivor_size = align_size_down(survivor_size, alignment); | |
| 164 // ... but never less than an alignment | |
| 165 survivor_size = MAX2(survivor_size, alignment); | |
| 166 | |
| 167 // Young generation is eden + 2 survivor spaces | |
| 168 size_t eden_size = size - (2 * survivor_size); | |
| 169 | |
| 170 // Now go ahead and set 'em. | |
| 171 set_space_boundaries(eden_size, survivor_size); | |
| 172 space_invariants(); | |
| 173 | |
| 174 if (UsePerfData) { | |
| 175 _eden_counters->update_capacity(); | |
| 176 _from_counters->update_capacity(); | |
| 177 _to_counters->update_capacity(); | |
| 178 } | |
| 179 } | |
| 180 | |
| 181 void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) { | |
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182 assert(eden_size < virtual_space()->committed_size(), "just checking"); |
| 0 | 183 assert(eden_size > 0 && survivor_size > 0, "just checking"); |
| 184 | |
| 185 // Initial layout is Eden, to, from. After swapping survivor spaces, | |
| 186 // that leaves us with Eden, from, to, which is step one in our two | |
| 187 // step resize-with-live-data procedure. | |
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188 char *eden_start = virtual_space()->low(); |
| 0 | 189 char *to_start = eden_start + eden_size; |
| 190 char *from_start = to_start + survivor_size; | |
| 191 char *from_end = from_start + survivor_size; | |
| 192 | |
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193 assert(from_end == virtual_space()->high(), "just checking"); |
| 0 | 194 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
| 195 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
| 196 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
| 197 | |
| 198 MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start); | |
| 199 MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start); | |
| 200 MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end); | |
| 201 | |
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202 eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea); |
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203 to_space()->initialize(to_mr , true, ZapUnusedHeapArea); |
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204 from_space()->initialize(from_mr, true, ZapUnusedHeapArea); |
| 0 | 205 } |
| 206 | |
| 207 #ifndef PRODUCT | |
| 208 void PSYoungGen::space_invariants() { | |
| 209 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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210 const size_t alignment = heap->intra_heap_alignment(); |
| 0 | 211 |
| 212 // Currently, our eden size cannot shrink to zero | |
| 213 guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small"); | |
| 214 guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small"); | |
| 215 guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small"); | |
| 216 | |
| 217 // Relationship of spaces to each other | |
| 218 char* eden_start = (char*)eden_space()->bottom(); | |
| 219 char* eden_end = (char*)eden_space()->end(); | |
| 220 char* from_start = (char*)from_space()->bottom(); | |
| 221 char* from_end = (char*)from_space()->end(); | |
| 222 char* to_start = (char*)to_space()->bottom(); | |
| 223 char* to_end = (char*)to_space()->end(); | |
| 224 | |
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225 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); |
| 0 | 226 guarantee(eden_start < eden_end, "eden space consistency"); |
| 227 guarantee(from_start < from_end, "from space consistency"); | |
| 228 guarantee(to_start < to_end, "to space consistency"); | |
| 229 | |
| 230 // Check whether from space is below to space | |
| 231 if (from_start < to_start) { | |
| 232 // Eden, from, to | |
| 233 guarantee(eden_end <= from_start, "eden/from boundary"); | |
| 234 guarantee(from_end <= to_start, "from/to boundary"); | |
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235 guarantee(to_end <= virtual_space()->high(), "to end"); |
| 0 | 236 } else { |
| 237 // Eden, to, from | |
| 238 guarantee(eden_end <= to_start, "eden/to boundary"); | |
| 239 guarantee(to_end <= from_start, "to/from boundary"); | |
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240 guarantee(from_end <= virtual_space()->high(), "from end"); |
| 0 | 241 } |
| 242 | |
| 243 // More checks that the virtual space is consistent with the spaces | |
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244 assert(virtual_space()->committed_size() >= |
| 0 | 245 (eden_space()->capacity_in_bytes() + |
| 246 to_space()->capacity_in_bytes() + | |
| 247 from_space()->capacity_in_bytes()), "Committed size is inconsistent"); | |
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248 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
| 0 | 249 "Space invariant"); |
| 250 char* eden_top = (char*)eden_space()->top(); | |
| 251 char* from_top = (char*)from_space()->top(); | |
| 252 char* to_top = (char*)to_space()->top(); | |
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253 assert(eden_top <= virtual_space()->high(), "eden top"); |
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254 assert(from_top <= virtual_space()->high(), "from top"); |
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255 assert(to_top <= virtual_space()->high(), "to top"); |
| 0 | 256 |
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257 virtual_space()->verify(); |
| 0 | 258 } |
| 259 #endif | |
| 260 | |
| 261 void PSYoungGen::resize(size_t eden_size, size_t survivor_size) { | |
| 262 // Resize the generation if needed. If the generation resize | |
| 263 // reports false, do not attempt to resize the spaces. | |
| 264 if (resize_generation(eden_size, survivor_size)) { | |
| 265 // Then we lay out the spaces inside the generation | |
| 266 resize_spaces(eden_size, survivor_size); | |
| 267 | |
| 268 space_invariants(); | |
| 269 | |
| 270 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 271 gclog_or_tty->print_cr("Young generation size: " | |
| 272 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
| 273 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
| 274 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
| 275 eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(), | |
| 276 _max_gen_size, min_gen_size()); | |
| 277 } | |
| 278 } | |
| 279 } | |
| 280 | |
| 281 | |
| 282 bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
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283 const size_t alignment = virtual_space()->alignment(); |
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284 size_t orig_size = virtual_space()->committed_size(); |
| 0 | 285 bool size_changed = false; |
| 286 | |
| 287 // There used to be this guarantee there. | |
| 288 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
| 289 // Code below forces this requirement. In addition the desired eden | |
| 290 // size and disired survivor sizes are desired goals and may | |
| 291 // exceed the total generation size. | |
| 292 | |
| 293 assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking"); | |
| 294 | |
| 295 // Adjust new generation size | |
| 296 const size_t eden_plus_survivors = | |
| 297 align_size_up(eden_size + 2 * survivor_size, alignment); | |
| 298 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()), | |
| 299 min_gen_size()); | |
| 300 assert(desired_size <= max_size(), "just checking"); | |
| 301 | |
| 302 if (desired_size > orig_size) { | |
| 303 // Grow the generation | |
| 304 size_t change = desired_size - orig_size; | |
| 305 assert(change % alignment == 0, "just checking"); | |
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306 HeapWord* prev_high = (HeapWord*) virtual_space()->high(); |
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307 if (!virtual_space()->expand_by(change)) { |
| 0 | 308 return false; // Error if we fail to resize! |
| 309 } | |
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310 if (ZapUnusedHeapArea) { |
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311 // Mangle newly committed space immediately because it |
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312 // can be done here more simply that after the new |
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313 // spaces have been computed. |
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314 HeapWord* new_high = (HeapWord*) virtual_space()->high(); |
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315 MemRegion mangle_region(prev_high, new_high); |
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316 SpaceMangler::mangle_region(mangle_region); |
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317 } |
| 0 | 318 size_changed = true; |
| 319 } else if (desired_size < orig_size) { | |
| 320 size_t desired_change = orig_size - desired_size; | |
| 321 assert(desired_change % alignment == 0, "just checking"); | |
| 322 | |
| 323 desired_change = limit_gen_shrink(desired_change); | |
| 324 | |
| 325 if (desired_change > 0) { | |
| 326 virtual_space()->shrink_by(desired_change); | |
| 327 reset_survivors_after_shrink(); | |
| 328 | |
| 329 size_changed = true; | |
| 330 } | |
| 331 } else { | |
| 332 if (Verbose && PrintGC) { | |
| 333 if (orig_size == gen_size_limit()) { | |
| 334 gclog_or_tty->print_cr("PSYoung generation size at maximum: " | |
| 335 SIZE_FORMAT "K", orig_size/K); | |
| 336 } else if (orig_size == min_gen_size()) { | |
| 337 gclog_or_tty->print_cr("PSYoung generation size at minium: " | |
| 338 SIZE_FORMAT "K", orig_size/K); | |
| 339 } | |
| 340 } | |
| 341 } | |
| 342 | |
| 343 if (size_changed) { | |
| 344 post_resize(); | |
| 345 | |
| 346 if (Verbose && PrintGC) { | |
|
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347 size_t current_size = virtual_space()->committed_size(); |
| 0 | 348 gclog_or_tty->print_cr("PSYoung generation size changed: " |
| 349 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
| 350 orig_size/K, current_size/K); | |
| 351 } | |
| 352 } | |
| 353 | |
|
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354 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || |
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355 virtual_space()->committed_size() == max_size(), "Sanity"); |
| 0 | 356 |
| 357 return true; | |
| 358 } | |
| 359 | |
|
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360 #ifndef PRODUCT |
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361 // In the numa case eden is not mangled so a survivor space |
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362 // moving into a region previously occupied by a survivor |
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363 // may find an unmangled region. Also in the PS case eden |
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364 // to-space and from-space may not touch (i.e., there may be |
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365 // gaps between them due to movement while resizing the |
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366 // spaces). Those gaps must be mangled. |
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367 void PSYoungGen::mangle_survivors(MutableSpace* s1, |
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368 MemRegion s1MR, |
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369 MutableSpace* s2, |
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370 MemRegion s2MR) { |
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371 // Check eden and gap between eden and from-space, in deciding |
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372 // what to mangle in from-space. Check the gap between from-space |
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373 // and to-space when deciding what to mangle. |
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374 // |
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375 // +--------+ +----+ +---+ |
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376 // | eden | |s1 | |s2 | |
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377 // +--------+ +----+ +---+ |
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378 // +-------+ +-----+ |
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379 // |s1MR | |s2MR | |
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380 // +-------+ +-----+ |
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381 // All of survivor-space is properly mangled so find the |
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382 // upper bound on the mangling for any portion above current s1. |
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383 HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end()); |
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384 MemRegion delta1_left; |
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385 if (s1MR.start() < delta_end) { |
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386 delta1_left = MemRegion(s1MR.start(), delta_end); |
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387 s1->mangle_region(delta1_left); |
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388 } |
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389 // Find any portion to the right of the current s1. |
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390 HeapWord* delta_start = MAX2(s1->end(), s1MR.start()); |
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391 MemRegion delta1_right; |
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392 if (delta_start < s1MR.end()) { |
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393 delta1_right = MemRegion(delta_start, s1MR.end()); |
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394 s1->mangle_region(delta1_right); |
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395 } |
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396 |
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397 // Similarly for the second survivor space except that |
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398 // any of the new region that overlaps with the current |
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399 // region of the first survivor space has already been |
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400 // mangled. |
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401 delta_end = MIN2(s2->bottom(), s2MR.end()); |
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402 delta_start = MAX2(s2MR.start(), s1->end()); |
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403 MemRegion delta2_left; |
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404 if (s2MR.start() < delta_end) { |
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405 delta2_left = MemRegion(s2MR.start(), delta_end); |
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406 s2->mangle_region(delta2_left); |
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407 } |
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408 delta_start = MAX2(s2->end(), s2MR.start()); |
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409 MemRegion delta2_right; |
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410 if (delta_start < s2MR.end()) { |
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411 s2->mangle_region(delta2_right); |
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412 } |
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413 |
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414 if (TraceZapUnusedHeapArea) { |
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415 // s1 |
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416 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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417 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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418 s1->bottom(), s1->end(), s1MR.start(), s1MR.end()); |
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419 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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420 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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421 delta1_left.start(), delta1_left.end(), delta1_right.start(), |
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422 delta1_right.end()); |
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423 |
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424 // s2 |
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425 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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426 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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427 s2->bottom(), s2->end(), s2MR.start(), s2MR.end()); |
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428 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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429 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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430 delta2_left.start(), delta2_left.end(), delta2_right.start(), |
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431 delta2_right.end()); |
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432 } |
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433 |
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434 } |
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435 #endif // NOT PRODUCT |
| 0 | 436 |
| 437 void PSYoungGen::resize_spaces(size_t requested_eden_size, | |
| 438 size_t requested_survivor_size) { | |
| 439 assert(UseAdaptiveSizePolicy, "sanity check"); | |
| 440 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
| 441 "just checking"); | |
| 442 | |
| 443 // We require eden and to space to be empty | |
| 444 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
| 445 return; | |
| 446 } | |
| 447 | |
| 448 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 449 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
| 450 SIZE_FORMAT | |
| 451 ", requested_survivor_size: " SIZE_FORMAT ")", | |
| 452 requested_eden_size, requested_survivor_size); | |
| 453 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 454 SIZE_FORMAT, | |
| 455 eden_space()->bottom(), | |
| 456 eden_space()->end(), | |
| 457 pointer_delta(eden_space()->end(), | |
| 458 eden_space()->bottom(), | |
| 459 sizeof(char))); | |
| 460 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 461 SIZE_FORMAT, | |
| 462 from_space()->bottom(), | |
| 463 from_space()->end(), | |
| 464 pointer_delta(from_space()->end(), | |
| 465 from_space()->bottom(), | |
| 466 sizeof(char))); | |
| 467 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 468 SIZE_FORMAT, | |
| 469 to_space()->bottom(), | |
| 470 to_space()->end(), | |
| 471 pointer_delta( to_space()->end(), | |
| 472 to_space()->bottom(), | |
| 473 sizeof(char))); | |
| 474 } | |
| 475 | |
| 476 // There's nothing to do if the new sizes are the same as the current | |
| 477 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
| 478 requested_survivor_size == from_space()->capacity_in_bytes() && | |
| 479 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
| 480 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 481 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
| 482 } | |
| 483 return; | |
| 484 } | |
| 485 | |
| 486 char* eden_start = (char*)eden_space()->bottom(); | |
| 487 char* eden_end = (char*)eden_space()->end(); | |
| 488 char* from_start = (char*)from_space()->bottom(); | |
| 489 char* from_end = (char*)from_space()->end(); | |
| 490 char* to_start = (char*)to_space()->bottom(); | |
| 491 char* to_end = (char*)to_space()->end(); | |
| 492 | |
| 493 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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494 const size_t alignment = heap->intra_heap_alignment(); |
| 0 | 495 const bool maintain_minimum = |
| 496 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
| 497 | |
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498 bool eden_from_to_order = from_start < to_start; |
| 0 | 499 // Check whether from space is below to space |
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500 if (eden_from_to_order) { |
| 0 | 501 // Eden, from, to |
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502 eden_from_to_order = true; |
| 0 | 503 if (PrintAdaptiveSizePolicy && Verbose) { |
| 504 gclog_or_tty->print_cr(" Eden, from, to:"); | |
| 505 } | |
| 506 | |
| 507 // Set eden | |
| 508 // "requested_eden_size" is a goal for the size of eden | |
| 509 // and may not be attainable. "eden_size" below is | |
| 510 // calculated based on the location of from-space and | |
| 511 // the goal for the size of eden. from-space is | |
| 512 // fixed in place because it contains live data. | |
| 513 // The calculation is done this way to avoid 32bit | |
| 514 // overflow (i.e., eden_start + requested_eden_size | |
| 515 // may too large for representation in 32bits). | |
| 516 size_t eden_size; | |
| 517 if (maintain_minimum) { | |
| 518 // Only make eden larger than the requested size if | |
| 519 // the minimum size of the generation has to be maintained. | |
| 520 // This could be done in general but policy at a higher | |
| 521 // level is determining a requested size for eden and that | |
| 522 // should be honored unless there is a fundamental reason. | |
| 523 eden_size = pointer_delta(from_start, | |
| 524 eden_start, | |
| 525 sizeof(char)); | |
| 526 } else { | |
| 527 eden_size = MIN2(requested_eden_size, | |
| 528 pointer_delta(from_start, eden_start, sizeof(char))); | |
| 529 } | |
| 530 | |
| 531 eden_end = eden_start + eden_size; | |
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532 assert(eden_end >= eden_start, "addition overflowed"); |
| 0 | 533 |
| 534 // To may resize into from space as long as it is clear of live data. | |
| 535 // From space must remain page aligned, though, so we need to do some | |
| 536 // extra calculations. | |
| 537 | |
| 538 // First calculate an optimal to-space | |
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539 to_end = (char*)virtual_space()->high(); |
| 0 | 540 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
| 541 sizeof(char)); | |
| 542 | |
| 543 // Does the optimal to-space overlap from-space? | |
| 544 if (to_start < (char*)from_space()->end()) { | |
| 545 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 546 | |
| 547 // Calculate the minimum offset possible for from_end | |
| 548 size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
| 549 | |
| 550 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
| 551 if (from_size == 0) { | |
| 552 from_size = alignment; | |
| 553 } else { | |
| 554 from_size = align_size_up(from_size, alignment); | |
| 555 } | |
| 556 | |
| 557 from_end = from_start + from_size; | |
| 558 assert(from_end > from_start, "addition overflow or from_size problem"); | |
| 559 | |
| 560 guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right"); | |
| 561 | |
| 562 // Now update to_start with the new from_end | |
| 563 to_start = MAX2(from_end, to_start); | |
| 564 } | |
| 565 | |
| 566 guarantee(to_start != to_end, "to space is zero sized"); | |
| 567 | |
| 568 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 569 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 570 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 571 eden_start, | |
| 572 eden_end, | |
| 573 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 574 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 575 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 576 from_start, | |
| 577 from_end, | |
| 578 pointer_delta(from_end, from_start, sizeof(char))); | |
| 579 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 580 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 581 to_start, | |
| 582 to_end, | |
| 583 pointer_delta( to_end, to_start, sizeof(char))); | |
| 584 } | |
| 585 } else { | |
| 586 // Eden, to, from | |
| 587 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 588 gclog_or_tty->print_cr(" Eden, to, from:"); | |
| 589 } | |
| 590 | |
| 591 // To space gets priority over eden resizing. Note that we position | |
| 592 // to space as if we were able to resize from space, even though from | |
| 593 // space is not modified. | |
| 594 // Giving eden priority was tried and gave poorer performance. | |
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595 to_end = (char*)pointer_delta(virtual_space()->high(), |
| 0 | 596 (char*)requested_survivor_size, |
| 597 sizeof(char)); | |
| 598 to_end = MIN2(to_end, from_start); | |
| 599 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
| 600 sizeof(char)); | |
| 601 // if the space sizes are to be increased by several times then | |
| 602 // 'to_start' will point beyond the young generation. In this case | |
| 603 // 'to_start' should be adjusted. | |
| 604 to_start = MAX2(to_start, eden_start + alignment); | |
| 605 | |
| 606 // Compute how big eden can be, then adjust end. | |
| 607 // See comments above on calculating eden_end. | |
| 608 size_t eden_size; | |
| 609 if (maintain_minimum) { | |
| 610 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); | |
| 611 } else { | |
| 612 eden_size = MIN2(requested_eden_size, | |
| 613 pointer_delta(to_start, eden_start, sizeof(char))); | |
| 614 } | |
| 615 eden_end = eden_start + eden_size; | |
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616 assert(eden_end >= eden_start, "addition overflowed"); |
| 0 | 617 |
| 618 // Could choose to not let eden shrink | |
| 619 // to_start = MAX2(to_start, eden_end); | |
| 620 | |
| 621 // Don't let eden shrink down to 0 or less. | |
| 622 eden_end = MAX2(eden_end, eden_start + alignment); | |
| 623 to_start = MAX2(to_start, eden_end); | |
| 624 | |
| 625 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 626 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 627 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 628 eden_start, | |
| 629 eden_end, | |
| 630 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 631 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 632 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 633 to_start, | |
| 634 to_end, | |
| 635 pointer_delta( to_end, to_start, sizeof(char))); | |
| 636 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 637 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 638 from_start, | |
| 639 from_end, | |
| 640 pointer_delta(from_end, from_start, sizeof(char))); | |
| 641 } | |
| 642 } | |
| 643 | |
| 644 | |
| 645 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
| 646 "from start moved to the right"); | |
| 647 guarantee((HeapWord*)from_end >= from_space()->top(), | |
| 648 "from end moved into live data"); | |
| 649 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
| 650 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
| 651 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
| 652 | |
| 653 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
| 654 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
| 655 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
| 656 | |
| 657 // Let's make sure the call to initialize doesn't reset "top"! | |
| 658 HeapWord* old_from_top = from_space()->top(); | |
| 659 | |
| 660 // For PrintAdaptiveSizePolicy block below | |
| 661 size_t old_from = from_space()->capacity_in_bytes(); | |
| 662 size_t old_to = to_space()->capacity_in_bytes(); | |
| 663 | |
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664 if (ZapUnusedHeapArea) { |
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665 // NUMA is a special case because a numa space is not mangled |
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666 // in order to not prematurely bind its address to memory to |
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667 // the wrong memory (i.e., don't want the GC thread to first |
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668 // touch the memory). The survivor spaces are not numa |
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669 // spaces and are mangled. |
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670 if (UseNUMA) { |
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671 if (eden_from_to_order) { |
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672 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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673 } else { |
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674 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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675 } |
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676 } |
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677 |
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678 // If not mangling the spaces, do some checking to verify that |
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679 // the spaces are already mangled. |
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680 // The spaces should be correctly mangled at this point so |
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681 // do some checking here. Note that they are not being mangled |
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682 // in the calls to initialize(). |
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683 // Must check mangling before the spaces are reshaped. Otherwise, |
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684 // the bottom or end of one space may have moved into an area |
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685 // covered by another space and a failure of the check may |
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686 // not correctly indicate which space is not properly mangled. |
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687 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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688 eden_space()->check_mangled_unused_area(limit); |
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689 from_space()->check_mangled_unused_area(limit); |
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690 to_space()->check_mangled_unused_area(limit); |
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691 } |
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692 // When an existing space is being initialized, it is not |
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693 // mangled because the space has been previously mangled. |
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694 eden_space()->initialize(edenMR, |
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695 SpaceDecorator::Clear, |
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696 SpaceDecorator::DontMangle); |
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697 to_space()->initialize(toMR, |
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698 SpaceDecorator::Clear, |
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699 SpaceDecorator::DontMangle); |
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700 from_space()->initialize(fromMR, |
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701 SpaceDecorator::DontClear, |
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702 SpaceDecorator::DontMangle); |
| 0 | 703 |
| 704 assert(from_space()->top() == old_from_top, "from top changed!"); | |
| 705 | |
| 706 if (PrintAdaptiveSizePolicy) { | |
| 707 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 708 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 709 | |
| 710 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
| 711 "collection: %d " | |
| 712 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
| 713 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
| 714 heap->total_collections(), | |
| 715 old_from, old_to, | |
| 716 from_space()->capacity_in_bytes(), | |
| 717 to_space()->capacity_in_bytes()); | |
| 718 gclog_or_tty->cr(); | |
| 719 } | |
| 720 } | |
| 721 | |
| 722 void PSYoungGen::swap_spaces() { | |
| 723 MutableSpace* s = from_space(); | |
| 724 _from_space = to_space(); | |
| 725 _to_space = s; | |
| 726 | |
| 727 // Now update the decorators. | |
| 728 PSMarkSweepDecorator* md = from_mark_sweep(); | |
| 729 _from_mark_sweep = to_mark_sweep(); | |
| 730 _to_mark_sweep = md; | |
| 731 | |
| 732 assert(from_mark_sweep()->space() == from_space(), "Sanity"); | |
| 733 assert(to_mark_sweep()->space() == to_space(), "Sanity"); | |
| 734 } | |
| 735 | |
| 736 size_t PSYoungGen::capacity_in_bytes() const { | |
| 737 return eden_space()->capacity_in_bytes() | |
| 738 + from_space()->capacity_in_bytes(); // to_space() is only used during scavenge | |
| 739 } | |
| 740 | |
| 741 | |
| 742 size_t PSYoungGen::used_in_bytes() const { | |
| 743 return eden_space()->used_in_bytes() | |
| 744 + from_space()->used_in_bytes(); // to_space() is only used during scavenge | |
| 745 } | |
| 746 | |
| 747 | |
| 748 size_t PSYoungGen::free_in_bytes() const { | |
| 749 return eden_space()->free_in_bytes() | |
| 750 + from_space()->free_in_bytes(); // to_space() is only used during scavenge | |
| 751 } | |
| 752 | |
| 753 size_t PSYoungGen::capacity_in_words() const { | |
| 754 return eden_space()->capacity_in_words() | |
| 755 + from_space()->capacity_in_words(); // to_space() is only used during scavenge | |
| 756 } | |
| 757 | |
| 758 | |
| 759 size_t PSYoungGen::used_in_words() const { | |
| 760 return eden_space()->used_in_words() | |
| 761 + from_space()->used_in_words(); // to_space() is only used during scavenge | |
| 762 } | |
| 763 | |
| 764 | |
| 765 size_t PSYoungGen::free_in_words() const { | |
| 766 return eden_space()->free_in_words() | |
| 767 + from_space()->free_in_words(); // to_space() is only used during scavenge | |
| 768 } | |
| 769 | |
| 770 void PSYoungGen::object_iterate(ObjectClosure* blk) { | |
| 771 eden_space()->object_iterate(blk); | |
| 772 from_space()->object_iterate(blk); | |
| 773 to_space()->object_iterate(blk); | |
| 774 } | |
| 775 | |
| 776 void PSYoungGen::precompact() { | |
| 777 eden_mark_sweep()->precompact(); | |
| 778 from_mark_sweep()->precompact(); | |
| 779 to_mark_sweep()->precompact(); | |
| 780 } | |
| 781 | |
| 782 void PSYoungGen::adjust_pointers() { | |
| 783 eden_mark_sweep()->adjust_pointers(); | |
| 784 from_mark_sweep()->adjust_pointers(); | |
| 785 to_mark_sweep()->adjust_pointers(); | |
| 786 } | |
| 787 | |
| 788 void PSYoungGen::compact() { | |
| 789 eden_mark_sweep()->compact(ZapUnusedHeapArea); | |
| 790 from_mark_sweep()->compact(ZapUnusedHeapArea); | |
| 791 // Mark sweep stores preserved markOops in to space, don't disturb! | |
| 792 to_mark_sweep()->compact(false); | |
| 793 } | |
| 794 | |
| 795 void PSYoungGen::move_and_update(ParCompactionManager* cm) { | |
| 796 PSParallelCompact::move_and_update(cm, PSParallelCompact::eden_space_id); | |
| 797 PSParallelCompact::move_and_update(cm, PSParallelCompact::from_space_id); | |
| 798 PSParallelCompact::move_and_update(cm, PSParallelCompact::to_space_id); | |
| 799 } | |
| 800 | |
| 801 void PSYoungGen::print() const { print_on(tty); } | |
| 802 void PSYoungGen::print_on(outputStream* st) const { | |
| 803 st->print(" %-15s", "PSYoungGen"); | |
| 804 if (PrintGCDetails && Verbose) { | |
| 805 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
| 806 capacity_in_bytes(), used_in_bytes()); | |
| 807 } else { | |
| 808 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
| 809 capacity_in_bytes()/K, used_in_bytes()/K); | |
| 810 } | |
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811 virtual_space()->print_space_boundaries_on(st); |
| 0 | 812 st->print(" eden"); eden_space()->print_on(st); |
| 813 st->print(" from"); from_space()->print_on(st); | |
| 814 st->print(" to "); to_space()->print_on(st); | |
| 815 } | |
| 816 | |
| 817 void PSYoungGen::print_used_change(size_t prev_used) const { | |
| 818 gclog_or_tty->print(" [%s:", name()); | |
| 819 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 820 "->" SIZE_FORMAT "K" | |
| 821 "(" SIZE_FORMAT "K)", | |
| 822 prev_used / K, used_in_bytes() / K, | |
| 823 capacity_in_bytes() / K); | |
| 824 gclog_or_tty->print("]"); | |
| 825 } | |
| 826 | |
| 827 size_t PSYoungGen::available_for_expansion() { | |
| 828 ShouldNotReachHere(); | |
| 829 return 0; | |
| 830 } | |
| 831 | |
| 832 size_t PSYoungGen::available_for_contraction() { | |
| 833 ShouldNotReachHere(); | |
| 834 return 0; | |
| 835 } | |
| 836 | |
| 837 size_t PSYoungGen::available_to_min_gen() { | |
| 838 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
| 839 return virtual_space()->committed_size() - min_gen_size(); | |
| 840 } | |
| 841 | |
| 842 // This method assumes that from-space has live data and that | |
| 843 // any shrinkage of the young gen is limited by location of | |
| 844 // from-space. | |
| 845 size_t PSYoungGen::available_to_live() { | |
| 846 size_t delta_in_survivor = 0; | |
| 847 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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848 const size_t space_alignment = heap->intra_heap_alignment(); |
| 0 | 849 const size_t gen_alignment = heap->young_gen_alignment(); |
| 850 | |
| 851 MutableSpace* space_shrinking = NULL; | |
| 852 if (from_space()->end() > to_space()->end()) { | |
| 853 space_shrinking = from_space(); | |
| 854 } else { | |
| 855 space_shrinking = to_space(); | |
| 856 } | |
| 857 | |
| 858 // Include any space that is committed but not included in | |
| 859 // the survivor spaces. | |
| 860 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
| 861 "Survivor space beyond high end"); | |
| 862 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
| 863 space_shrinking->end(), sizeof(char)); | |
| 864 | |
| 865 if (space_shrinking->is_empty()) { | |
| 866 // Don't let the space shrink to 0 | |
| 867 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
| 868 "Space is too small"); | |
| 869 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
| 870 } else { | |
| 871 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
| 872 space_shrinking->top(), | |
| 873 sizeof(char)); | |
| 874 } | |
| 875 | |
| 876 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
| 877 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
| 878 return delta_in_bytes; | |
| 879 } | |
| 880 | |
| 881 // Return the number of bytes available for resizing down the young | |
| 882 // generation. This is the minimum of | |
| 883 // input "bytes" | |
| 884 // bytes to the minimum young gen size | |
| 885 // bytes to the size currently being used + some small extra | |
| 886 size_t PSYoungGen::limit_gen_shrink(size_t bytes) { | |
| 887 // Allow shrinkage into the current eden but keep eden large enough | |
| 888 // to maintain the minimum young gen size | |
| 889 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
| 890 return align_size_down(bytes, virtual_space()->alignment()); | |
| 891 } | |
| 892 | |
| 893 void PSYoungGen::reset_after_change() { | |
| 894 ShouldNotReachHere(); | |
| 895 } | |
| 896 | |
| 897 void PSYoungGen::reset_survivors_after_shrink() { | |
| 898 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
| 899 (HeapWord*)virtual_space()->high_boundary()); | |
| 900 PSScavenge::reference_processor()->set_span(_reserved); | |
| 901 | |
| 902 MutableSpace* space_shrinking = NULL; | |
| 903 if (from_space()->end() > to_space()->end()) { | |
| 904 space_shrinking = from_space(); | |
| 905 } else { | |
| 906 space_shrinking = to_space(); | |
| 907 } | |
| 908 | |
| 909 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
| 910 assert(new_end >= space_shrinking->bottom(), "Shrink was too large"); | |
| 911 // Was there a shrink of the survivor space? | |
| 912 if (new_end < space_shrinking->end()) { | |
| 913 MemRegion mr(space_shrinking->bottom(), new_end); | |
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914 space_shrinking->initialize(mr, |
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915 SpaceDecorator::DontClear, |
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916 SpaceDecorator::Mangle); |
| 0 | 917 } |
| 918 } | |
| 919 | |
| 920 // This method currently does not expect to expand into eden (i.e., | |
| 921 // the virtual space boundaries is expected to be consistent | |
| 922 // with the eden boundaries.. | |
| 923 void PSYoungGen::post_resize() { | |
| 924 assert_locked_or_safepoint(Heap_lock); | |
| 925 assert((eden_space()->bottom() < to_space()->bottom()) && | |
| 926 (eden_space()->bottom() < from_space()->bottom()), | |
| 927 "Eden is assumed to be below the survivor spaces"); | |
| 928 | |
| 929 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
| 930 (HeapWord*)virtual_space()->high()); | |
| 931 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
| 932 space_invariants(); | |
| 933 } | |
| 934 | |
| 935 | |
| 936 | |
| 937 void PSYoungGen::update_counters() { | |
| 938 if (UsePerfData) { | |
| 939 _eden_counters->update_all(); | |
| 940 _from_counters->update_all(); | |
| 941 _to_counters->update_all(); | |
| 942 _gen_counters->update_all(); | |
| 943 } | |
| 944 } | |
| 945 | |
| 946 void PSYoungGen::verify(bool allow_dirty) { | |
| 947 eden_space()->verify(allow_dirty); | |
| 948 from_space()->verify(allow_dirty); | |
| 949 to_space()->verify(allow_dirty); | |
| 950 } | |
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951 |
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952 #ifndef PRODUCT |
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953 void PSYoungGen::record_spaces_top() { |
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954 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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955 eden_space()->set_top_for_allocations(); |
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956 from_space()->set_top_for_allocations(); |
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957 to_space()->set_top_for_allocations(); |
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958 } |
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959 #endif |