author | sangheki |
Fri, 21 Dec 2018 08:23:55 -0800 | |
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parent 49982 | 9042ffe5b7fe |
child 54678 | 93f09ca4a7f8 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc/parallel/objectStartArray.inline.hpp" |
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#include "gc/parallel/parallelScavengeHeap.hpp" |
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#include "gc/parallel/psAdaptiveSizePolicy.hpp" |
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#include "gc/parallel/psCardTable.hpp" |
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#include "gc/parallel/psFileBackedVirtualspace.hpp" |
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#include "gc/parallel/psMarkSweepDecorator.hpp" |
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#include "gc/parallel/psOldGen.hpp" |
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#include "gc/shared/cardTableBarrierSet.hpp" |
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#include "gc/shared/gcLocker.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "logging/log.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "utilities/align.hpp" |
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inline const char* PSOldGen::select_name() { |
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return UseParallelOldGC ? "ParOldGen" : "PSOldGen"; |
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} |
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PSOldGen::PSOldGen(ReservedSpace rs, size_t alignment, |
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size_t initial_size, size_t min_size, size_t max_size, |
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const char* perf_data_name, int level): |
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_name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), |
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_max_gen_size(max_size) |
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{ |
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initialize(rs, alignment, perf_data_name, level); |
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} |
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PSOldGen::PSOldGen(size_t initial_size, |
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size_t min_size, size_t max_size, |
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const char* perf_data_name, int level): |
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_name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), |
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_max_gen_size(max_size) |
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{} |
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void PSOldGen::initialize(ReservedSpace rs, size_t alignment, |
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const char* perf_data_name, int level) { |
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initialize_virtual_space(rs, alignment); |
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initialize_work(perf_data_name, level); |
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// The old gen can grow to gen_size_limit(). _reserve reflects only |
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// the current maximum that can be committed. |
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assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); |
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initialize_performance_counters(perf_data_name, level); |
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} |
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void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { |
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if(ParallelScavengeHeap::heap()->ps_collector_policy()->is_hetero_heap()) { |
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_virtual_space = new PSFileBackedVirtualSpace(rs, alignment, AllocateOldGenAt); |
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if (!(static_cast <PSFileBackedVirtualSpace*>(_virtual_space))->initialize()) { |
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vm_exit_during_initialization("Could not map space for PSOldGen at given AllocateOldGenAt path"); |
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} |
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} else { |
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_virtual_space = new PSVirtualSpace(rs, alignment); |
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} |
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if (!_virtual_space->expand_by(_init_gen_size)) { |
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vm_exit_during_initialization("Could not reserve enough space for " |
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"object heap"); |
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} |
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} |
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void PSOldGen::initialize_work(const char* perf_data_name, int level) { |
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// |
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// Basic memory initialization |
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// |
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MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), |
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heap_word_size(_max_gen_size)); |
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assert(limit_reserved.byte_size() == _max_gen_size, |
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"word vs bytes confusion"); |
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// |
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// Object start stuff |
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// |
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start_array()->initialize(limit_reserved); |
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_reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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(HeapWord*)virtual_space()->high_boundary()); |
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// |
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// Card table stuff |
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// |
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MemRegion cmr((HeapWord*)virtual_space()->low(), |
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(HeapWord*)virtual_space()->high()); |
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if (ZapUnusedHeapArea) { |
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// Mangle newly committed space immediately rather than |
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// waiting for the initialization of the space even though |
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// mangling is related to spaces. Doing it here eliminates |
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// the need to carry along information that a complete mangling |
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// (bottom to end) needs to be done. |
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SpaceMangler::mangle_region(cmr); |
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} |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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PSCardTable* ct = heap->card_table(); |
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ct->resize_covered_region(cmr); |
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// Verify that the start and end of this generation is the start of a card. |
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// If this wasn't true, a single card could span more than one generation, |
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// which would cause problems when we commit/uncommit memory, and when we |
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// clear and dirty cards. |
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guarantee(ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); |
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if (_reserved.end() != heap->reserved_region().end()) { |
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// Don't check at the very end of the heap as we'll assert that we're probing off |
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// the end if we try. |
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guarantee(ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); |
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} |
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// |
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// ObjectSpace stuff |
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// |
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_object_space = new MutableSpace(virtual_space()->alignment()); |
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if (_object_space == NULL) |
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vm_exit_during_initialization("Could not allocate an old gen space"); |
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object_space()->initialize(cmr, |
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SpaceDecorator::Clear, |
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SpaceDecorator::Mangle); |
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#if INCLUDE_SERIALGC |
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_object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); |
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if (_object_mark_sweep == NULL) { |
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vm_exit_during_initialization("Could not complete allocation of old generation"); |
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} |
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#endif // INCLUDE_SERIALGC |
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// Update the start_array |
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start_array()->set_covered_region(cmr); |
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} |
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void PSOldGen::initialize_performance_counters(const char* perf_data_name, int level) { |
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// Generation Counters, generation 'level', 1 subspace |
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_gen_counters = new PSGenerationCounters(perf_data_name, level, 1, _min_gen_size, |
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_max_gen_size, virtual_space()); |
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_space_counters = new SpaceCounters(perf_data_name, 0, |
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virtual_space()->reserved_size(), |
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_object_space, _gen_counters); |
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} |
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// Assume that the generation has been allocated if its |
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// reserved size is not 0. |
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bool PSOldGen::is_allocated() { |
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return virtual_space()->reserved_size() != 0; |
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} |
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#if INCLUDE_SERIALGC |
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void PSOldGen::precompact() { |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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// Reset start array first. |
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start_array()->reset(); |
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185 |
object_mark_sweep()->precompact(); |
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// Now compact the young gen |
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heap->young_gen()->precompact(); |
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} |
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191 |
void PSOldGen::adjust_pointers() { |
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object_mark_sweep()->adjust_pointers(); |
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} |
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194 |
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195 |
void PSOldGen::compact() { |
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196 |
object_mark_sweep()->compact(ZapUnusedHeapArea); |
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} |
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#endif // INCLUDE_SERIALGC |
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1 | 201 |
size_t PSOldGen::contiguous_available() const { |
202 |
return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); |
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} |
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204 |
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// Allocation. We report all successful allocations to the size policy |
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// Note that the perm gen does not use this method, and should not! |
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HeapWord* PSOldGen::allocate(size_t word_size) { |
1 | 208 |
assert_locked_or_safepoint(Heap_lock); |
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HeapWord* res = allocate_noexpand(word_size); |
1 | 210 |
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if (res == NULL) { |
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res = expand_and_allocate(word_size); |
1 | 213 |
} |
214 |
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215 |
// Allocations in the old generation need to be reported |
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if (res != NULL) { |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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heap->size_policy()->tenured_allocation(word_size * HeapWordSize); |
1 | 219 |
} |
220 |
||
221 |
return res; |
|
222 |
} |
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HeapWord* PSOldGen::expand_and_allocate(size_t word_size) { |
1 | 225 |
expand(word_size*HeapWordSize); |
226 |
if (GCExpandToAllocateDelayMillis > 0) { |
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227 |
os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); |
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228 |
} |
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return allocate_noexpand(word_size); |
1 | 230 |
} |
231 |
||
232 |
HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { |
|
233 |
expand(word_size*HeapWordSize); |
|
234 |
if (GCExpandToAllocateDelayMillis > 0) { |
|
235 |
os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); |
|
236 |
} |
|
237 |
return cas_allocate_noexpand(word_size); |
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238 |
} |
|
239 |
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240 |
void PSOldGen::expand(size_t bytes) { |
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if (bytes == 0) { |
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return; |
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} |
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MutexLocker x(ExpandHeap_lock); |
245 |
const size_t alignment = virtual_space()->alignment(); |
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size_t aligned_bytes = align_up(bytes, alignment); |
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size_t aligned_expand_bytes = align_up(MinHeapDeltaBytes, alignment); |
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|
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if (UseNUMA) { |
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// With NUMA we use round-robin page allocation for the old gen. Expand by at least |
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// providing a page per lgroup. Alignment is larger or equal to the page size. |
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aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
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} |
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if (aligned_bytes == 0){ |
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// The alignment caused the number of bytes to wrap. An expand_by(0) will |
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// return true with the implication that and expansion was done when it |
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// was not. A call to expand implies a best effort to expand by "bytes" |
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// but not a guarantee. Align down to give a best effort. This is likely |
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// the most that the generation can expand since it has some capacity to |
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260 |
// start with. |
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aligned_bytes = align_down(bytes, alignment); |
979
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262 |
} |
1 | 263 |
|
264 |
bool success = false; |
|
265 |
if (aligned_expand_bytes > aligned_bytes) { |
|
266 |
success = expand_by(aligned_expand_bytes); |
|
267 |
} |
|
268 |
if (!success) { |
|
269 |
success = expand_by(aligned_bytes); |
|
270 |
} |
|
271 |
if (!success) { |
|
272 |
success = expand_to_reserved(); |
|
273 |
} |
|
274 |
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if (success && GCLocker::is_active_and_needs_gc()) { |
35061 | 276 |
log_debug(gc)("Garbage collection disabled, expanded heap instead"); |
1 | 277 |
} |
278 |
} |
|
279 |
||
280 |
bool PSOldGen::expand_by(size_t bytes) { |
|
281 |
assert_lock_strong(ExpandHeap_lock); |
|
282 |
assert_locked_or_safepoint(Heap_lock); |
|
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if (bytes == 0) { |
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return true; // That's what virtual_space()->expand_by(0) would return |
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285 |
} |
1 | 286 |
bool result = virtual_space()->expand_by(bytes); |
287 |
if (result) { |
|
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if (ZapUnusedHeapArea) { |
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// We need to mangle the newly expanded area. The memregion spans |
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// end -> new_end, we assume that top -> end is already mangled. |
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291 |
// Do the mangling before post_resize() is called because |
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292 |
// the space is available for allocation after post_resize(); |
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293 |
HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
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294 |
assert(object_space()->end() < virtual_space_high, |
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295 |
"Should be true before post_resize()"); |
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296 |
MemRegion mangle_region(object_space()->end(), virtual_space_high); |
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297 |
// Note that the object space has not yet been updated to |
22551 | 298 |
// coincide with the new underlying virtual space. |
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299 |
SpaceMangler::mangle_region(mangle_region); |
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|
300 |
} |
1 | 301 |
post_resize(); |
302 |
if (UsePerfData) { |
|
303 |
_space_counters->update_capacity(); |
|
304 |
_gen_counters->update_all(); |
|
305 |
} |
|
306 |
} |
|
307 |
||
35061 | 308 |
if (result) { |
1 | 309 |
size_t new_mem_size = virtual_space()->committed_size(); |
310 |
size_t old_mem_size = new_mem_size - bytes; |
|
35061 | 311 |
log_debug(gc)("Expanding %s from " SIZE_FORMAT "K by " SIZE_FORMAT "K to " SIZE_FORMAT "K", |
312 |
name(), old_mem_size/K, bytes/K, new_mem_size/K); |
|
1 | 313 |
} |
314 |
||
315 |
return result; |
|
316 |
} |
|
317 |
||
318 |
bool PSOldGen::expand_to_reserved() { |
|
319 |
assert_lock_strong(ExpandHeap_lock); |
|
320 |
assert_locked_or_safepoint(Heap_lock); |
|
321 |
||
322 |
bool result = true; |
|
323 |
const size_t remaining_bytes = virtual_space()->uncommitted_size(); |
|
324 |
if (remaining_bytes > 0) { |
|
325 |
result = expand_by(remaining_bytes); |
|
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326 |
DEBUG_ONLY(if (!result) log_warning(gc)("grow to reserve failed")); |
1 | 327 |
} |
328 |
return result; |
|
329 |
} |
|
330 |
||
331 |
void PSOldGen::shrink(size_t bytes) { |
|
332 |
assert_lock_strong(ExpandHeap_lock); |
|
333 |
assert_locked_or_safepoint(Heap_lock); |
|
334 |
||
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335 |
size_t size = align_down(bytes, virtual_space()->alignment()); |
1 | 336 |
if (size > 0) { |
337 |
assert_lock_strong(ExpandHeap_lock); |
|
338 |
virtual_space()->shrink_by(bytes); |
|
339 |
post_resize(); |
|
340 |
||
35061 | 341 |
size_t new_mem_size = virtual_space()->committed_size(); |
342 |
size_t old_mem_size = new_mem_size + bytes; |
|
343 |
log_debug(gc)("Shrinking %s from " SIZE_FORMAT "K by " SIZE_FORMAT "K to " SIZE_FORMAT "K", |
|
344 |
name(), old_mem_size/K, bytes/K, new_mem_size/K); |
|
1 | 345 |
} |
346 |
} |
|
347 |
||
348 |
void PSOldGen::resize(size_t desired_free_space) { |
|
349 |
const size_t alignment = virtual_space()->alignment(); |
|
350 |
const size_t size_before = virtual_space()->committed_size(); |
|
351 |
size_t new_size = used_in_bytes() + desired_free_space; |
|
352 |
if (new_size < used_in_bytes()) { |
|
353 |
// Overflowed the addition. |
|
354 |
new_size = gen_size_limit(); |
|
355 |
} |
|
356 |
// Adjust according to our min and max |
|
357 |
new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); |
|
358 |
||
359 |
assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); |
|
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360 |
new_size = align_up(new_size, alignment); |
1 | 361 |
|
362 |
const size_t current_size = capacity_in_bytes(); |
|
363 |
||
35061 | 364 |
log_trace(gc, ergo)("AdaptiveSizePolicy::old generation size: " |
365 |
"desired free: " SIZE_FORMAT " used: " SIZE_FORMAT |
|
366 |
" new size: " SIZE_FORMAT " current size " SIZE_FORMAT |
|
367 |
" gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, |
|
368 |
desired_free_space, used_in_bytes(), new_size, current_size, |
|
369 |
gen_size_limit(), min_gen_size()); |
|
1 | 370 |
|
371 |
if (new_size == current_size) { |
|
372 |
// No change requested |
|
373 |
return; |
|
374 |
} |
|
375 |
if (new_size > current_size) { |
|
376 |
size_t change_bytes = new_size - current_size; |
|
377 |
expand(change_bytes); |
|
378 |
} else { |
|
379 |
size_t change_bytes = current_size - new_size; |
|
380 |
// shrink doesn't grab this lock, expand does. Is that right? |
|
381 |
MutexLocker x(ExpandHeap_lock); |
|
382 |
shrink(change_bytes); |
|
383 |
} |
|
384 |
||
35061 | 385 |
log_trace(gc, ergo)("AdaptiveSizePolicy::old generation size: collection: %d (" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", |
386 |
ParallelScavengeHeap::heap()->total_collections(), |
|
387 |
size_before, |
|
388 |
virtual_space()->committed_size()); |
|
1 | 389 |
} |
390 |
||
391 |
// NOTE! We need to be careful about resizing. During a GC, multiple |
|
392 |
// allocators may be active during heap expansion. If we allow the |
|
393 |
// heap resizing to become visible before we have correctly resized |
|
394 |
// all heap related data structures, we may cause program failures. |
|
395 |
void PSOldGen::post_resize() { |
|
396 |
// First construct a memregion representing the new size |
|
397 |
MemRegion new_memregion((HeapWord*)virtual_space()->low(), |
|
398 |
(HeapWord*)virtual_space()->high()); |
|
399 |
size_t new_word_size = new_memregion.word_size(); |
|
400 |
||
401 |
start_array()->set_covered_region(new_memregion); |
|
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402 |
ParallelScavengeHeap::heap()->card_table()->resize_covered_region(new_memregion); |
1 | 403 |
|
404 |
// ALWAYS do this last!! |
|
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|
405 |
object_space()->initialize(new_memregion, |
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|
406 |
SpaceDecorator::DontClear, |
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|
407 |
SpaceDecorator::DontMangle); |
1 | 408 |
|
409 |
assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), |
|
410 |
"Sanity"); |
|
411 |
} |
|
412 |
||
413 |
size_t PSOldGen::gen_size_limit() { |
|
414 |
return _max_gen_size; |
|
415 |
} |
|
416 |
||
417 |
void PSOldGen::reset_after_change() { |
|
418 |
ShouldNotReachHere(); |
|
419 |
return; |
|
420 |
} |
|
421 |
||
422 |
size_t PSOldGen::available_for_expansion() { |
|
423 |
ShouldNotReachHere(); |
|
424 |
return 0; |
|
425 |
} |
|
426 |
||
427 |
size_t PSOldGen::available_for_contraction() { |
|
428 |
ShouldNotReachHere(); |
|
429 |
return 0; |
|
430 |
} |
|
431 |
||
432 |
void PSOldGen::print() const { print_on(tty);} |
|
433 |
void PSOldGen::print_on(outputStream* st) const { |
|
434 |
st->print(" %-15s", name()); |
|
35061 | 435 |
st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
436 |
capacity_in_bytes()/K, used_in_bytes()/K); |
|
1 | 437 |
st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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|
438 |
p2i(virtual_space()->low_boundary()), |
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439 |
p2i(virtual_space()->high()), |
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|
440 |
p2i(virtual_space()->high_boundary())); |
1 | 441 |
|
442 |
st->print(" object"); object_space()->print_on(st); |
|
443 |
} |
|
444 |
||
445 |
void PSOldGen::print_used_change(size_t prev_used) const { |
|
35061 | 446 |
log_info(gc, heap)("%s: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)", |
447 |
name(), prev_used / K, used_in_bytes() / K, capacity_in_bytes() / K); |
|
1 | 448 |
} |
449 |
||
450 |
void PSOldGen::update_counters() { |
|
451 |
if (UsePerfData) { |
|
452 |
_space_counters->update_all(); |
|
453 |
_gen_counters->update_all(); |
|
454 |
} |
|
455 |
} |
|
456 |
||
457 |
#ifndef PRODUCT |
|
458 |
||
459 |
void PSOldGen::space_invariants() { |
|
460 |
assert(object_space()->end() == (HeapWord*) virtual_space()->high(), |
|
461 |
"Space invariant"); |
|
462 |
assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), |
|
463 |
"Space invariant"); |
|
464 |
assert(virtual_space()->low_boundary() <= virtual_space()->low(), |
|
465 |
"Space invariant"); |
|
466 |
assert(virtual_space()->high_boundary() >= virtual_space()->high(), |
|
467 |
"Space invariant"); |
|
468 |
assert(virtual_space()->low_boundary() == (char*) _reserved.start(), |
|
469 |
"Space invariant"); |
|
470 |
assert(virtual_space()->high_boundary() == (char*) _reserved.end(), |
|
471 |
"Space invariant"); |
|
472 |
assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
|
473 |
"Space invariant"); |
|
474 |
} |
|
475 |
#endif |
|
476 |
||
12379 | 477 |
void PSOldGen::verify() { |
478 |
object_space()->verify(); |
|
1 | 479 |
} |
480 |
class VerifyObjectStartArrayClosure : public ObjectClosure { |
|
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|
481 |
PSOldGen* _old_gen; |
1 | 482 |
ObjectStartArray* _start_array; |
483 |
||
484 |
public: |
|
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|
485 |
VerifyObjectStartArrayClosure(PSOldGen* old_gen, ObjectStartArray* start_array) : |
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|
486 |
_old_gen(old_gen), _start_array(start_array) { } |
1 | 487 |
|
488 |
virtual void do_object(oop obj) { |
|
489 |
HeapWord* test_addr = (HeapWord*)obj + 1; |
|
490 |
guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); |
|
491 |
guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); |
|
492 |
} |
|
493 |
}; |
|
494 |
||
495 |
void PSOldGen::verify_object_start_array() { |
|
496 |
VerifyObjectStartArrayClosure check( this, &_start_array ); |
|
497 |
object_iterate(&check); |
|
498 |
} |
|
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|
499 |
|
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|
500 |
#ifndef PRODUCT |
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|
501 |
void PSOldGen::record_spaces_top() { |
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changeset
|
502 |
assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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|
503 |
object_space()->set_top_for_allocations(); |
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|
504 |
} |
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|
505 |
#endif |