Fri, 24 Jun 2016 17:12:13 +0800
[Code Reorganization] Removed GC related modifications made by Loongson, for example, UseOldNUMA.
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
aoqi@0 | 27 | #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" |
aoqi@0 | 28 | #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" |
aoqi@0 | 29 | #include "gc_implementation/parallelScavenge/psOldGen.hpp" |
aoqi@0 | 30 | #include "gc_implementation/shared/spaceDecorator.hpp" |
aoqi@0 | 31 | #include "memory/cardTableModRefBS.hpp" |
aoqi@0 | 32 | #include "memory/gcLocker.inline.hpp" |
aoqi@0 | 33 | #include "oops/oop.inline.hpp" |
aoqi@0 | 34 | #include "runtime/java.hpp" |
aoqi@0 | 35 | |
aoqi@0 | 36 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
aoqi@0 | 37 | |
aoqi@0 | 38 | inline const char* PSOldGen::select_name() { |
aoqi@0 | 39 | return UseParallelOldGC ? "ParOldGen" : "PSOldGen"; |
aoqi@0 | 40 | } |
aoqi@0 | 41 | |
aoqi@0 | 42 | PSOldGen::PSOldGen(ReservedSpace rs, size_t alignment, |
aoqi@0 | 43 | size_t initial_size, size_t min_size, size_t max_size, |
aoqi@0 | 44 | const char* perf_data_name, int level): |
aoqi@0 | 45 | _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), |
aoqi@0 | 46 | _max_gen_size(max_size) |
aoqi@0 | 47 | { |
aoqi@0 | 48 | initialize(rs, alignment, perf_data_name, level); |
aoqi@0 | 49 | } |
aoqi@0 | 50 | |
aoqi@0 | 51 | PSOldGen::PSOldGen(size_t initial_size, |
aoqi@0 | 52 | size_t min_size, size_t max_size, |
aoqi@0 | 53 | const char* perf_data_name, int level): |
aoqi@0 | 54 | _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), |
aoqi@0 | 55 | _max_gen_size(max_size) |
aoqi@0 | 56 | {} |
aoqi@0 | 57 | |
aoqi@0 | 58 | void PSOldGen::initialize(ReservedSpace rs, size_t alignment, |
aoqi@0 | 59 | const char* perf_data_name, int level) { |
aoqi@0 | 60 | initialize_virtual_space(rs, alignment); |
aoqi@0 | 61 | initialize_work(perf_data_name, level); |
aoqi@0 | 62 | |
aoqi@0 | 63 | // The old gen can grow to gen_size_limit(). _reserve reflects only |
aoqi@0 | 64 | // the current maximum that can be committed. |
aoqi@0 | 65 | assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); |
aoqi@0 | 66 | |
aoqi@0 | 67 | initialize_performance_counters(perf_data_name, level); |
aoqi@0 | 68 | } |
aoqi@0 | 69 | |
aoqi@0 | 70 | void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { |
aoqi@0 | 71 | |
aoqi@0 | 72 | _virtual_space = new PSVirtualSpace(rs, alignment); |
aoqi@0 | 73 | if (!_virtual_space->expand_by(_init_gen_size)) { |
aoqi@0 | 74 | vm_exit_during_initialization("Could not reserve enough space for " |
aoqi@0 | 75 | "object heap"); |
aoqi@0 | 76 | } |
aoqi@0 | 77 | } |
aoqi@0 | 78 | |
aoqi@0 | 79 | void PSOldGen::initialize_work(const char* perf_data_name, int level) { |
aoqi@0 | 80 | // |
aoqi@0 | 81 | // Basic memory initialization |
aoqi@0 | 82 | // |
aoqi@0 | 83 | |
aoqi@0 | 84 | MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), |
aoqi@0 | 85 | heap_word_size(_max_gen_size)); |
aoqi@0 | 86 | assert(limit_reserved.byte_size() == _max_gen_size, |
aoqi@0 | 87 | "word vs bytes confusion"); |
aoqi@0 | 88 | // |
aoqi@0 | 89 | // Object start stuff |
aoqi@0 | 90 | // |
aoqi@0 | 91 | |
aoqi@0 | 92 | start_array()->initialize(limit_reserved); |
aoqi@0 | 93 | |
aoqi@0 | 94 | _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
aoqi@0 | 95 | (HeapWord*)virtual_space()->high_boundary()); |
aoqi@0 | 96 | |
aoqi@0 | 97 | // |
aoqi@0 | 98 | // Card table stuff |
aoqi@0 | 99 | // |
aoqi@0 | 100 | |
aoqi@0 | 101 | MemRegion cmr((HeapWord*)virtual_space()->low(), |
aoqi@0 | 102 | (HeapWord*)virtual_space()->high()); |
aoqi@0 | 103 | if (ZapUnusedHeapArea) { |
aoqi@0 | 104 | // Mangle newly committed space immediately rather than |
aoqi@0 | 105 | // waiting for the initialization of the space even though |
aoqi@0 | 106 | // mangling is related to spaces. Doing it here eliminates |
aoqi@0 | 107 | // the need to carry along information that a complete mangling |
aoqi@0 | 108 | // (bottom to end) needs to be done. |
aoqi@0 | 109 | SpaceMangler::mangle_region(cmr); |
aoqi@0 | 110 | } |
aoqi@0 | 111 | |
aoqi@0 | 112 | Universe::heap()->barrier_set()->resize_covered_region(cmr); |
aoqi@0 | 113 | |
aoqi@0 | 114 | CardTableModRefBS* _ct = (CardTableModRefBS*)Universe::heap()->barrier_set(); |
aoqi@0 | 115 | assert (_ct->kind() == BarrierSet::CardTableModRef, "Sanity"); |
aoqi@0 | 116 | |
aoqi@0 | 117 | // Verify that the start and end of this generation is the start of a card. |
aoqi@0 | 118 | // If this wasn't true, a single card could span more than one generation, |
aoqi@0 | 119 | // which would cause problems when we commit/uncommit memory, and when we |
aoqi@0 | 120 | // clear and dirty cards. |
aoqi@0 | 121 | guarantee(_ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); |
aoqi@0 | 122 | if (_reserved.end() != Universe::heap()->reserved_region().end()) { |
aoqi@0 | 123 | // Don't check at the very end of the heap as we'll assert that we're probing off |
aoqi@0 | 124 | // the end if we try. |
aoqi@0 | 125 | guarantee(_ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); |
aoqi@0 | 126 | } |
aoqi@0 | 127 | |
aoqi@0 | 128 | // |
aoqi@0 | 129 | // ObjectSpace stuff |
aoqi@0 | 130 | // |
aoqi@25 | 131 | |
aoqi@25 | 132 | _object_space = new MutableSpace(virtual_space()->alignment()); |
aoqi@0 | 133 | |
aoqi@0 | 134 | if (_object_space == NULL) |
aoqi@0 | 135 | vm_exit_during_initialization("Could not allocate an old gen space"); |
aoqi@0 | 136 | |
aoqi@0 | 137 | object_space()->initialize(cmr, |
aoqi@0 | 138 | SpaceDecorator::Clear, |
aoqi@0 | 139 | SpaceDecorator::Mangle); |
aoqi@0 | 140 | |
aoqi@0 | 141 | _object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); |
aoqi@0 | 142 | |
aoqi@0 | 143 | if (_object_mark_sweep == NULL) |
aoqi@0 | 144 | vm_exit_during_initialization("Could not complete allocation of old generation"); |
aoqi@0 | 145 | |
aoqi@0 | 146 | // Update the start_array |
aoqi@0 | 147 | start_array()->set_covered_region(cmr); |
aoqi@0 | 148 | } |
aoqi@0 | 149 | |
aoqi@0 | 150 | void PSOldGen::initialize_performance_counters(const char* perf_data_name, int level) { |
aoqi@0 | 151 | // Generation Counters, generation 'level', 1 subspace |
aoqi@0 | 152 | _gen_counters = new PSGenerationCounters(perf_data_name, level, 1, |
aoqi@0 | 153 | virtual_space()); |
aoqi@0 | 154 | _space_counters = new SpaceCounters(perf_data_name, 0, |
aoqi@0 | 155 | virtual_space()->reserved_size(), |
aoqi@0 | 156 | _object_space, _gen_counters); |
aoqi@0 | 157 | } |
aoqi@0 | 158 | |
aoqi@0 | 159 | // Assume that the generation has been allocated if its |
aoqi@0 | 160 | // reserved size is not 0. |
aoqi@0 | 161 | bool PSOldGen::is_allocated() { |
aoqi@0 | 162 | return virtual_space()->reserved_size() != 0; |
aoqi@0 | 163 | } |
aoqi@0 | 164 | |
aoqi@0 | 165 | void PSOldGen::precompact() { |
aoqi@0 | 166 | ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
aoqi@0 | 167 | assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
aoqi@0 | 168 | |
aoqi@0 | 169 | // Reset start array first. |
aoqi@0 | 170 | start_array()->reset(); |
aoqi@0 | 171 | |
aoqi@0 | 172 | object_mark_sweep()->precompact(); |
aoqi@0 | 173 | |
aoqi@0 | 174 | // Now compact the young gen |
aoqi@0 | 175 | heap->young_gen()->precompact(); |
aoqi@0 | 176 | } |
aoqi@0 | 177 | |
aoqi@0 | 178 | void PSOldGen::adjust_pointers() { |
aoqi@0 | 179 | object_mark_sweep()->adjust_pointers(); |
aoqi@0 | 180 | } |
aoqi@0 | 181 | |
aoqi@0 | 182 | void PSOldGen::compact() { |
aoqi@0 | 183 | object_mark_sweep()->compact(ZapUnusedHeapArea); |
aoqi@0 | 184 | } |
aoqi@0 | 185 | |
aoqi@0 | 186 | size_t PSOldGen::contiguous_available() const { |
aoqi@0 | 187 | return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); |
aoqi@0 | 188 | } |
aoqi@0 | 189 | |
aoqi@0 | 190 | // Allocation. We report all successful allocations to the size policy |
aoqi@0 | 191 | // Note that the perm gen does not use this method, and should not! |
aoqi@0 | 192 | HeapWord* PSOldGen::allocate(size_t word_size) { |
aoqi@0 | 193 | assert_locked_or_safepoint(Heap_lock); |
aoqi@0 | 194 | HeapWord* res = allocate_noexpand(word_size); |
aoqi@0 | 195 | |
aoqi@0 | 196 | if (res == NULL) { |
aoqi@0 | 197 | res = expand_and_allocate(word_size); |
aoqi@0 | 198 | } |
aoqi@0 | 199 | |
aoqi@0 | 200 | // Allocations in the old generation need to be reported |
aoqi@0 | 201 | if (res != NULL) { |
aoqi@0 | 202 | ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
aoqi@0 | 203 | heap->size_policy()->tenured_allocation(word_size); |
aoqi@0 | 204 | } |
aoqi@0 | 205 | |
aoqi@0 | 206 | return res; |
aoqi@0 | 207 | } |
aoqi@0 | 208 | |
aoqi@0 | 209 | HeapWord* PSOldGen::expand_and_allocate(size_t word_size) { |
aoqi@0 | 210 | expand(word_size*HeapWordSize); |
aoqi@0 | 211 | if (GCExpandToAllocateDelayMillis > 0) { |
aoqi@0 | 212 | os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); |
aoqi@0 | 213 | } |
aoqi@0 | 214 | return allocate_noexpand(word_size); |
aoqi@0 | 215 | } |
aoqi@0 | 216 | |
aoqi@25 | 217 | HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { |
aoqi@0 | 218 | expand(word_size*HeapWordSize); |
aoqi@0 | 219 | if (GCExpandToAllocateDelayMillis > 0) { |
aoqi@0 | 220 | os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); |
aoqi@0 | 221 | } |
aoqi@25 | 222 | return cas_allocate_noexpand(word_size); |
aoqi@0 | 223 | } |
aoqi@0 | 224 | |
aoqi@0 | 225 | void PSOldGen::expand(size_t bytes) { |
aoqi@0 | 226 | if (bytes == 0) { |
aoqi@0 | 227 | return; |
aoqi@0 | 228 | } |
aoqi@0 | 229 | MutexLocker x(ExpandHeap_lock); |
aoqi@0 | 230 | const size_t alignment = virtual_space()->alignment(); |
aoqi@0 | 231 | size_t aligned_bytes = align_size_up(bytes, alignment); |
aoqi@0 | 232 | size_t aligned_expand_bytes = align_size_up(MinHeapDeltaBytes, alignment); |
aoqi@0 | 233 | |
aoqi@0 | 234 | if (UseNUMA) { |
aoqi@0 | 235 | // With NUMA we use round-robin page allocation for the old gen. Expand by at least |
aoqi@0 | 236 | // providing a page per lgroup. Alignment is larger or equal to the page size. |
aoqi@0 | 237 | aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
aoqi@0 | 238 | } |
aoqi@0 | 239 | if (aligned_bytes == 0){ |
aoqi@0 | 240 | // The alignment caused the number of bytes to wrap. An expand_by(0) will |
aoqi@0 | 241 | // return true with the implication that and expansion was done when it |
aoqi@0 | 242 | // was not. A call to expand implies a best effort to expand by "bytes" |
aoqi@0 | 243 | // but not a guarantee. Align down to give a best effort. This is likely |
aoqi@0 | 244 | // the most that the generation can expand since it has some capacity to |
aoqi@0 | 245 | // start with. |
aoqi@0 | 246 | aligned_bytes = align_size_down(bytes, alignment); |
aoqi@0 | 247 | } |
aoqi@0 | 248 | |
aoqi@0 | 249 | bool success = false; |
aoqi@0 | 250 | if (aligned_expand_bytes > aligned_bytes) { |
aoqi@0 | 251 | success = expand_by(aligned_expand_bytes); |
aoqi@0 | 252 | } |
aoqi@0 | 253 | if (!success) { |
aoqi@0 | 254 | success = expand_by(aligned_bytes); |
aoqi@0 | 255 | } |
aoqi@0 | 256 | if (!success) { |
aoqi@0 | 257 | success = expand_to_reserved(); |
aoqi@0 | 258 | } |
aoqi@0 | 259 | |
aoqi@0 | 260 | if (PrintGC && Verbose) { |
aoqi@0 | 261 | if (success && GC_locker::is_active_and_needs_gc()) { |
aoqi@0 | 262 | gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
aoqi@0 | 263 | } |
aoqi@0 | 264 | } |
aoqi@0 | 265 | } |
aoqi@0 | 266 | |
aoqi@0 | 267 | bool PSOldGen::expand_by(size_t bytes) { |
aoqi@0 | 268 | assert_lock_strong(ExpandHeap_lock); |
aoqi@0 | 269 | assert_locked_or_safepoint(Heap_lock); |
aoqi@0 | 270 | if (bytes == 0) { |
aoqi@0 | 271 | return true; // That's what virtual_space()->expand_by(0) would return |
aoqi@0 | 272 | } |
aoqi@0 | 273 | bool result = virtual_space()->expand_by(bytes); |
aoqi@0 | 274 | if (result) { |
aoqi@0 | 275 | if (ZapUnusedHeapArea) { |
aoqi@0 | 276 | // We need to mangle the newly expanded area. The memregion spans |
aoqi@0 | 277 | // end -> new_end, we assume that top -> end is already mangled. |
aoqi@0 | 278 | // Do the mangling before post_resize() is called because |
aoqi@0 | 279 | // the space is available for allocation after post_resize(); |
aoqi@0 | 280 | HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
aoqi@0 | 281 | assert(object_space()->end() < virtual_space_high, |
aoqi@0 | 282 | "Should be true before post_resize()"); |
aoqi@0 | 283 | MemRegion mangle_region(object_space()->end(), virtual_space_high); |
aoqi@0 | 284 | // Note that the object space has not yet been updated to |
aoqi@0 | 285 | // coincede with the new underlying virtual space. |
aoqi@0 | 286 | SpaceMangler::mangle_region(mangle_region); |
aoqi@0 | 287 | } |
aoqi@0 | 288 | post_resize(); |
aoqi@0 | 289 | if (UsePerfData) { |
aoqi@0 | 290 | _space_counters->update_capacity(); |
aoqi@0 | 291 | _gen_counters->update_all(); |
aoqi@0 | 292 | } |
aoqi@0 | 293 | } |
aoqi@0 | 294 | |
aoqi@0 | 295 | if (result && Verbose && PrintGC) { |
aoqi@0 | 296 | size_t new_mem_size = virtual_space()->committed_size(); |
aoqi@0 | 297 | size_t old_mem_size = new_mem_size - bytes; |
aoqi@0 | 298 | gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " |
aoqi@0 | 299 | SIZE_FORMAT "K to " |
aoqi@0 | 300 | SIZE_FORMAT "K", |
aoqi@0 | 301 | name(), old_mem_size/K, bytes/K, new_mem_size/K); |
aoqi@0 | 302 | } |
aoqi@0 | 303 | |
aoqi@0 | 304 | return result; |
aoqi@0 | 305 | } |
aoqi@0 | 306 | |
aoqi@0 | 307 | bool PSOldGen::expand_to_reserved() { |
aoqi@0 | 308 | assert_lock_strong(ExpandHeap_lock); |
aoqi@0 | 309 | assert_locked_or_safepoint(Heap_lock); |
aoqi@0 | 310 | |
aoqi@0 | 311 | bool result = true; |
aoqi@0 | 312 | const size_t remaining_bytes = virtual_space()->uncommitted_size(); |
aoqi@0 | 313 | if (remaining_bytes > 0) { |
aoqi@0 | 314 | result = expand_by(remaining_bytes); |
aoqi@0 | 315 | DEBUG_ONLY(if (!result) warning("grow to reserve failed")); |
aoqi@0 | 316 | } |
aoqi@0 | 317 | return result; |
aoqi@0 | 318 | } |
aoqi@0 | 319 | |
aoqi@0 | 320 | void PSOldGen::shrink(size_t bytes) { |
aoqi@0 | 321 | assert_lock_strong(ExpandHeap_lock); |
aoqi@0 | 322 | assert_locked_or_safepoint(Heap_lock); |
aoqi@0 | 323 | |
aoqi@0 | 324 | size_t size = align_size_down(bytes, virtual_space()->alignment()); |
aoqi@0 | 325 | if (size > 0) { |
aoqi@0 | 326 | assert_lock_strong(ExpandHeap_lock); |
aoqi@0 | 327 | virtual_space()->shrink_by(bytes); |
aoqi@0 | 328 | post_resize(); |
aoqi@0 | 329 | |
aoqi@0 | 330 | if (Verbose && PrintGC) { |
aoqi@0 | 331 | size_t new_mem_size = virtual_space()->committed_size(); |
aoqi@0 | 332 | size_t old_mem_size = new_mem_size + bytes; |
aoqi@0 | 333 | gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by " |
aoqi@0 | 334 | SIZE_FORMAT "K to " |
aoqi@0 | 335 | SIZE_FORMAT "K", |
aoqi@0 | 336 | name(), old_mem_size/K, bytes/K, new_mem_size/K); |
aoqi@0 | 337 | } |
aoqi@0 | 338 | } |
aoqi@0 | 339 | } |
aoqi@0 | 340 | |
aoqi@0 | 341 | void PSOldGen::resize(size_t desired_free_space) { |
aoqi@0 | 342 | const size_t alignment = virtual_space()->alignment(); |
aoqi@0 | 343 | const size_t size_before = virtual_space()->committed_size(); |
aoqi@0 | 344 | size_t new_size = used_in_bytes() + desired_free_space; |
aoqi@0 | 345 | if (new_size < used_in_bytes()) { |
aoqi@0 | 346 | // Overflowed the addition. |
aoqi@0 | 347 | new_size = gen_size_limit(); |
aoqi@0 | 348 | } |
aoqi@0 | 349 | // Adjust according to our min and max |
aoqi@0 | 350 | new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); |
aoqi@0 | 351 | |
aoqi@0 | 352 | assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); |
aoqi@0 | 353 | new_size = align_size_up(new_size, alignment); |
aoqi@0 | 354 | |
aoqi@0 | 355 | const size_t current_size = capacity_in_bytes(); |
aoqi@0 | 356 | |
aoqi@0 | 357 | if (PrintAdaptiveSizePolicy && Verbose) { |
aoqi@0 | 358 | gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " |
aoqi@0 | 359 | "desired free: " SIZE_FORMAT " used: " SIZE_FORMAT |
aoqi@0 | 360 | " new size: " SIZE_FORMAT " current size " SIZE_FORMAT |
aoqi@0 | 361 | " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, |
aoqi@0 | 362 | desired_free_space, used_in_bytes(), new_size, current_size, |
aoqi@0 | 363 | gen_size_limit(), min_gen_size()); |
aoqi@0 | 364 | } |
aoqi@0 | 365 | |
aoqi@0 | 366 | if (new_size == current_size) { |
aoqi@0 | 367 | // No change requested |
aoqi@0 | 368 | return; |
aoqi@0 | 369 | } |
aoqi@0 | 370 | if (new_size > current_size) { |
aoqi@0 | 371 | size_t change_bytes = new_size - current_size; |
aoqi@0 | 372 | expand(change_bytes); |
aoqi@0 | 373 | } else { |
aoqi@0 | 374 | size_t change_bytes = current_size - new_size; |
aoqi@0 | 375 | // shrink doesn't grab this lock, expand does. Is that right? |
aoqi@0 | 376 | MutexLocker x(ExpandHeap_lock); |
aoqi@0 | 377 | shrink(change_bytes); |
aoqi@0 | 378 | } |
aoqi@0 | 379 | |
aoqi@0 | 380 | if (PrintAdaptiveSizePolicy) { |
aoqi@0 | 381 | ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
aoqi@0 | 382 | assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
aoqi@0 | 383 | gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " |
aoqi@0 | 384 | "collection: %d " |
aoqi@0 | 385 | "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", |
aoqi@0 | 386 | heap->total_collections(), |
aoqi@0 | 387 | size_before, virtual_space()->committed_size()); |
aoqi@0 | 388 | } |
aoqi@0 | 389 | } |
aoqi@0 | 390 | |
aoqi@0 | 391 | // NOTE! We need to be careful about resizing. During a GC, multiple |
aoqi@0 | 392 | // allocators may be active during heap expansion. If we allow the |
aoqi@0 | 393 | // heap resizing to become visible before we have correctly resized |
aoqi@0 | 394 | // all heap related data structures, we may cause program failures. |
aoqi@0 | 395 | void PSOldGen::post_resize() { |
aoqi@0 | 396 | // First construct a memregion representing the new size |
aoqi@0 | 397 | MemRegion new_memregion((HeapWord*)virtual_space()->low(), |
aoqi@0 | 398 | (HeapWord*)virtual_space()->high()); |
aoqi@0 | 399 | size_t new_word_size = new_memregion.word_size(); |
aoqi@0 | 400 | |
aoqi@0 | 401 | start_array()->set_covered_region(new_memregion); |
aoqi@0 | 402 | Universe::heap()->barrier_set()->resize_covered_region(new_memregion); |
aoqi@0 | 403 | |
aoqi@0 | 404 | // ALWAYS do this last!! |
aoqi@25 | 405 | object_space()->initialize(new_memregion, |
aoqi@25 | 406 | SpaceDecorator::DontClear, |
aoqi@25 | 407 | SpaceDecorator::DontMangle); |
aoqi@25 | 408 | |
aoqi@0 | 409 | assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), |
aoqi@0 | 410 | "Sanity"); |
aoqi@0 | 411 | } |
aoqi@0 | 412 | |
aoqi@0 | 413 | size_t PSOldGen::gen_size_limit() { |
aoqi@0 | 414 | return _max_gen_size; |
aoqi@0 | 415 | } |
aoqi@0 | 416 | |
aoqi@0 | 417 | void PSOldGen::reset_after_change() { |
aoqi@0 | 418 | ShouldNotReachHere(); |
aoqi@0 | 419 | return; |
aoqi@0 | 420 | } |
aoqi@0 | 421 | |
aoqi@0 | 422 | size_t PSOldGen::available_for_expansion() { |
aoqi@0 | 423 | ShouldNotReachHere(); |
aoqi@0 | 424 | return 0; |
aoqi@0 | 425 | } |
aoqi@0 | 426 | |
aoqi@0 | 427 | size_t PSOldGen::available_for_contraction() { |
aoqi@0 | 428 | ShouldNotReachHere(); |
aoqi@0 | 429 | return 0; |
aoqi@0 | 430 | } |
aoqi@0 | 431 | |
aoqi@0 | 432 | void PSOldGen::print() const { print_on(tty);} |
aoqi@0 | 433 | void PSOldGen::print_on(outputStream* st) const { |
aoqi@0 | 434 | st->print(" %-15s", name()); |
aoqi@0 | 435 | if (PrintGCDetails && Verbose) { |
aoqi@0 | 436 | st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, |
aoqi@0 | 437 | capacity_in_bytes(), used_in_bytes()); |
aoqi@0 | 438 | } else { |
aoqi@0 | 439 | st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
aoqi@0 | 440 | capacity_in_bytes()/K, used_in_bytes()/K); |
aoqi@0 | 441 | } |
aoqi@0 | 442 | st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
aoqi@0 | 443 | virtual_space()->low_boundary(), |
aoqi@0 | 444 | virtual_space()->high(), |
aoqi@0 | 445 | virtual_space()->high_boundary()); |
aoqi@0 | 446 | |
aoqi@0 | 447 | st->print(" object"); object_space()->print_on(st); |
aoqi@0 | 448 | } |
aoqi@0 | 449 | |
aoqi@0 | 450 | void PSOldGen::print_used_change(size_t prev_used) const { |
aoqi@0 | 451 | gclog_or_tty->print(" [%s:", name()); |
aoqi@0 | 452 | gclog_or_tty->print(" " SIZE_FORMAT "K" |
aoqi@0 | 453 | "->" SIZE_FORMAT "K" |
aoqi@0 | 454 | "(" SIZE_FORMAT "K)", |
aoqi@0 | 455 | prev_used / K, used_in_bytes() / K, |
aoqi@0 | 456 | capacity_in_bytes() / K); |
aoqi@0 | 457 | gclog_or_tty->print("]"); |
aoqi@0 | 458 | } |
aoqi@0 | 459 | |
aoqi@0 | 460 | void PSOldGen::update_counters() { |
aoqi@0 | 461 | if (UsePerfData) { |
aoqi@0 | 462 | _space_counters->update_all(); |
aoqi@0 | 463 | _gen_counters->update_all(); |
aoqi@0 | 464 | } |
aoqi@0 | 465 | } |
aoqi@0 | 466 | |
aoqi@0 | 467 | #ifndef PRODUCT |
aoqi@0 | 468 | |
aoqi@0 | 469 | void PSOldGen::space_invariants() { |
aoqi@0 | 470 | assert(object_space()->end() == (HeapWord*) virtual_space()->high(), |
aoqi@0 | 471 | "Space invariant"); |
aoqi@0 | 472 | assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), |
aoqi@0 | 473 | "Space invariant"); |
aoqi@0 | 474 | assert(virtual_space()->low_boundary() <= virtual_space()->low(), |
aoqi@0 | 475 | "Space invariant"); |
aoqi@0 | 476 | assert(virtual_space()->high_boundary() >= virtual_space()->high(), |
aoqi@0 | 477 | "Space invariant"); |
aoqi@0 | 478 | assert(virtual_space()->low_boundary() == (char*) _reserved.start(), |
aoqi@0 | 479 | "Space invariant"); |
aoqi@0 | 480 | assert(virtual_space()->high_boundary() == (char*) _reserved.end(), |
aoqi@0 | 481 | "Space invariant"); |
aoqi@0 | 482 | assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
aoqi@0 | 483 | "Space invariant"); |
aoqi@0 | 484 | } |
aoqi@0 | 485 | #endif |
aoqi@0 | 486 | |
aoqi@0 | 487 | void PSOldGen::verify() { |
aoqi@0 | 488 | object_space()->verify(); |
aoqi@0 | 489 | } |
aoqi@0 | 490 | class VerifyObjectStartArrayClosure : public ObjectClosure { |
aoqi@0 | 491 | PSOldGen* _gen; |
aoqi@0 | 492 | ObjectStartArray* _start_array; |
aoqi@0 | 493 | |
aoqi@0 | 494 | public: |
aoqi@0 | 495 | VerifyObjectStartArrayClosure(PSOldGen* gen, ObjectStartArray* start_array) : |
aoqi@0 | 496 | _gen(gen), _start_array(start_array) { } |
aoqi@0 | 497 | |
aoqi@0 | 498 | virtual void do_object(oop obj) { |
aoqi@0 | 499 | HeapWord* test_addr = (HeapWord*)obj + 1; |
aoqi@0 | 500 | guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); |
aoqi@0 | 501 | guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); |
aoqi@0 | 502 | } |
aoqi@0 | 503 | }; |
aoqi@0 | 504 | |
aoqi@0 | 505 | void PSOldGen::verify_object_start_array() { |
aoqi@0 | 506 | VerifyObjectStartArrayClosure check( this, &_start_array ); |
aoqi@0 | 507 | object_iterate(&check); |
aoqi@0 | 508 | } |
aoqi@0 | 509 | |
aoqi@0 | 510 | #ifndef PRODUCT |
aoqi@0 | 511 | void PSOldGen::record_spaces_top() { |
aoqi@0 | 512 | assert(ZapUnusedHeapArea, "Not mangling unused space"); |
aoqi@0 | 513 | object_space()->set_top_for_allocations(); |
aoqi@0 | 514 | } |
aoqi@0 | 515 | #endif |