author | sjohanss |
Fri, 21 Feb 2014 09:48:52 +0100 | |
changeset 23224 | b156569bc190 |
parent 22776 | d99c54477401 |
child 23851 | 60303358c862 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2013, 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_implementation/shared/adaptiveSizePolicy.hpp" |
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#include "gc_implementation/shared/gcPolicyCounters.hpp" |
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#include "gc_implementation/shared/vmGCOperations.hpp" |
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#include "memory/cardTableRS.hpp" |
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#include "memory/collectorPolicy.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "memory/genCollectedHeap.hpp" |
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#include "memory/generationSpec.hpp" |
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#include "memory/space.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/arguments.hpp" |
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#include "runtime/globals_extension.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/macros.hpp" |
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#if INCLUDE_ALL_GCS |
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#include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" |
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#include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" |
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#endif // INCLUDE_ALL_GCS |
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// CollectorPolicy methods |
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CollectorPolicy::CollectorPolicy() : |
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_space_alignment(0), |
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_heap_alignment(0), |
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_initial_heap_byte_size(InitialHeapSize), |
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_max_heap_byte_size(MaxHeapSize), |
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_min_heap_byte_size(Arguments::min_heap_size()), |
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_max_heap_size_cmdline(false), |
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_size_policy(NULL), |
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_should_clear_all_soft_refs(false), |
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_all_soft_refs_clear(false) |
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{} |
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#ifdef ASSERT |
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void CollectorPolicy::assert_flags() { |
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assert(InitialHeapSize <= MaxHeapSize, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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assert(InitialHeapSize % _heap_alignment == 0, "InitialHeapSize alignment"); |
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assert(MaxHeapSize % _heap_alignment == 0, "MaxHeapSize alignment"); |
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} |
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void CollectorPolicy::assert_size_info() { |
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assert(InitialHeapSize == _initial_heap_byte_size, "Discrepancy between InitialHeapSize flag and local storage"); |
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assert(MaxHeapSize == _max_heap_byte_size, "Discrepancy between MaxHeapSize flag and local storage"); |
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assert(_max_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible minimum and maximum heap sizes"); |
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assert(_initial_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible initial and minimum heap sizes"); |
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assert(_max_heap_byte_size >= _initial_heap_byte_size, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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assert(_min_heap_byte_size % _heap_alignment == 0, "min_heap_byte_size alignment"); |
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assert(_initial_heap_byte_size % _heap_alignment == 0, "initial_heap_byte_size alignment"); |
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assert(_max_heap_byte_size % _heap_alignment == 0, "max_heap_byte_size alignment"); |
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} |
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#endif // ASSERT |
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void CollectorPolicy::initialize_flags() { |
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assert(_space_alignment != 0, "Space alignment not set up properly"); |
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assert(_heap_alignment != 0, "Heap alignment not set up properly"); |
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assert(_heap_alignment >= _space_alignment, |
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err_msg("heap_alignment: " SIZE_FORMAT " less than space_alignment: " SIZE_FORMAT, |
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_heap_alignment, _space_alignment)); |
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assert(_heap_alignment % _space_alignment == 0, |
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err_msg("heap_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT, |
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_heap_alignment, _space_alignment)); |
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if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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if (FLAG_IS_CMDLINE(InitialHeapSize) && InitialHeapSize > MaxHeapSize) { |
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vm_exit_during_initialization("Initial heap size set to a larger value than the maximum heap size"); |
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} |
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if (_min_heap_byte_size != 0 && MaxHeapSize < _min_heap_byte_size) { |
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vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
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} |
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_max_heap_size_cmdline = true; |
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} |
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// Check heap parameter properties |
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if (InitialHeapSize < M) { |
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vm_exit_during_initialization("Too small initial heap"); |
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} |
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if (_min_heap_byte_size < M) { |
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vm_exit_during_initialization("Too small minimum heap"); |
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} |
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|
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// User inputs from -Xmx and -Xms must be aligned |
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_min_heap_byte_size = align_size_up(_min_heap_byte_size, _heap_alignment); |
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uintx aligned_initial_heap_size = align_size_up(InitialHeapSize, _heap_alignment); |
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uintx aligned_max_heap_size = align_size_up(MaxHeapSize, _heap_alignment); |
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|
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// Write back to flags if the values changed |
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if (aligned_initial_heap_size != InitialHeapSize) { |
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FLAG_SET_ERGO(uintx, InitialHeapSize, aligned_initial_heap_size); |
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} |
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if (aligned_max_heap_size != MaxHeapSize) { |
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FLAG_SET_ERGO(uintx, MaxHeapSize, aligned_max_heap_size); |
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} |
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|
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if (FLAG_IS_CMDLINE(InitialHeapSize) && _min_heap_byte_size != 0 && |
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InitialHeapSize < _min_heap_byte_size) { |
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vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
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} |
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if (!FLAG_IS_DEFAULT(InitialHeapSize) && InitialHeapSize > MaxHeapSize) { |
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FLAG_SET_ERGO(uintx, MaxHeapSize, InitialHeapSize); |
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} else if (!FLAG_IS_DEFAULT(MaxHeapSize) && InitialHeapSize > MaxHeapSize) { |
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FLAG_SET_ERGO(uintx, InitialHeapSize, MaxHeapSize); |
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if (InitialHeapSize < _min_heap_byte_size) { |
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_min_heap_byte_size = InitialHeapSize; |
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} |
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} |
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|
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_initial_heap_byte_size = InitialHeapSize; |
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_max_heap_byte_size = MaxHeapSize; |
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137 |
|
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FLAG_SET_ERGO(uintx, MinHeapDeltaBytes, align_size_up(MinHeapDeltaBytes, _space_alignment)); |
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139 |
|
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DEBUG_ONLY(CollectorPolicy::assert_flags();) |
1 | 141 |
} |
142 |
||
143 |
void CollectorPolicy::initialize_size_info() { |
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if (PrintGCDetails && Verbose) { |
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gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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_min_heap_byte_size, _initial_heap_byte_size, _max_heap_byte_size); |
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} |
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149 |
|
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DEBUG_ONLY(CollectorPolicy::assert_size_info();) |
1 | 151 |
} |
152 |
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bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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bool result = _should_clear_all_soft_refs; |
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set_should_clear_all_soft_refs(false); |
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return result; |
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} |
1 | 158 |
|
159 |
GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, |
|
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int max_covered_regions) { |
|
20316 | 161 |
return new CardTableRS(whole_heap, max_covered_regions); |
1 | 162 |
} |
163 |
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void CollectorPolicy::cleared_all_soft_refs() { |
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// If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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// have been cleared in the last collection but if the gc overhear |
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// limit continues to be near, SoftRefs should still be cleared. |
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if (size_policy() != NULL) { |
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_should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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} |
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_all_soft_refs_clear = true; |
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} |
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173 |
|
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size_t CollectorPolicy::compute_heap_alignment() { |
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// The card marking array and the offset arrays for old generations are |
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// committed in os pages as well. Make sure they are entirely full (to |
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// avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 |
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// byte entry and the os page size is 4096, the maximum heap size should |
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// be 512*4096 = 2MB aligned. |
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180 |
|
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size_t alignment = GenRemSet::max_alignment_constraint(); |
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182 |
|
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// Parallel GC does its own alignment of the generations to avoid requiring a |
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// large page (256M on some platforms) for the permanent generation. The |
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// other collectors should also be updated to do their own alignment and then |
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// this use of lcm() should be removed. |
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if (UseLargePages && !UseParallelGC) { |
22551 | 188 |
// In presence of large pages we have to make sure that our |
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// alignment is large page aware |
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alignment = lcm(os::large_page_size(), alignment); |
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191 |
} |
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192 |
|
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return alignment; |
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194 |
} |
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195 |
|
22551 | 196 |
// GenCollectorPolicy methods |
1 | 197 |
|
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GenCollectorPolicy::GenCollectorPolicy() : |
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_min_gen0_size(0), |
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_initial_gen0_size(0), |
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_max_gen0_size(0), |
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_gen_alignment(0), |
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_generations(NULL) |
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204 |
{} |
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205 |
|
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size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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return align_size_down_bounded(base_size / (NewRatio + 1), _gen_alignment); |
186
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} |
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209 |
|
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size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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size_t maximum_size) { |
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size_t max_minus = maximum_size - _gen_alignment; |
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return desired_size < max_minus ? desired_size : max_minus; |
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} |
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215 |
|
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216 |
|
1 | 217 |
void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
218 |
size_t init_promo_size, |
|
219 |
size_t init_survivor_size) { |
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const double max_gc_pause_sec = ((double) MaxGCPauseMillis) / 1000.0; |
1 | 221 |
_size_policy = new AdaptiveSizePolicy(init_eden_size, |
222 |
init_promo_size, |
|
223 |
init_survivor_size, |
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224 |
max_gc_pause_sec, |
1 | 225 |
GCTimeRatio); |
226 |
} |
|
227 |
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228 |
size_t GenCollectorPolicy::young_gen_size_lower_bound() { |
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// The young generation must be aligned and have room for eden + two survivors |
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return align_size_up(3 * _space_alignment, _gen_alignment); |
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231 |
} |
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232 |
|
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233 |
#ifdef ASSERT |
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234 |
void GenCollectorPolicy::assert_flags() { |
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235 |
CollectorPolicy::assert_flags(); |
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236 |
assert(NewSize >= _min_gen0_size, "Ergonomics decided on a too small young gen size"); |
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237 |
assert(NewSize <= MaxNewSize, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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238 |
assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young gen and heap sizes"); |
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239 |
assert(NewSize % _gen_alignment == 0, "NewSize alignment"); |
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240 |
assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize % _gen_alignment == 0, "MaxNewSize alignment"); |
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241 |
} |
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242 |
|
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243 |
void TwoGenerationCollectorPolicy::assert_flags() { |
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GenCollectorPolicy::assert_flags(); |
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245 |
assert(OldSize + NewSize <= MaxHeapSize, "Ergonomics decided on incompatible generation and heap sizes"); |
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246 |
assert(OldSize % _gen_alignment == 0, "OldSize alignment"); |
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247 |
} |
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248 |
|
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249 |
void GenCollectorPolicy::assert_size_info() { |
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250 |
CollectorPolicy::assert_size_info(); |
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251 |
// GenCollectorPolicy::initialize_size_info may update the MaxNewSize |
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252 |
assert(MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young and heap sizes"); |
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253 |
assert(NewSize == _initial_gen0_size, "Discrepancy between NewSize flag and local storage"); |
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254 |
assert(MaxNewSize == _max_gen0_size, "Discrepancy between MaxNewSize flag and local storage"); |
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255 |
assert(_min_gen0_size <= _initial_gen0_size, "Ergonomics decided on incompatible minimum and initial young gen sizes"); |
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256 |
assert(_initial_gen0_size <= _max_gen0_size, "Ergonomics decided on incompatible initial and maximum young gen sizes"); |
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257 |
assert(_min_gen0_size % _gen_alignment == 0, "_min_gen0_size alignment"); |
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258 |
assert(_initial_gen0_size % _gen_alignment == 0, "_initial_gen0_size alignment"); |
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259 |
assert(_max_gen0_size % _gen_alignment == 0, "_max_gen0_size alignment"); |
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260 |
} |
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|
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262 |
void TwoGenerationCollectorPolicy::assert_size_info() { |
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GenCollectorPolicy::assert_size_info(); |
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assert(OldSize == _initial_gen1_size, "Discrepancy between OldSize flag and local storage"); |
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assert(_min_gen1_size <= _initial_gen1_size, "Ergonomics decided on incompatible minimum and initial old gen sizes"); |
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assert(_initial_gen1_size <= _max_gen1_size, "Ergonomics decided on incompatible initial and maximum old gen sizes"); |
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267 |
assert(_max_gen1_size % _gen_alignment == 0, "_max_gen1_size alignment"); |
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268 |
assert(_initial_gen1_size % _gen_alignment == 0, "_initial_gen1_size alignment"); |
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269 |
assert(_max_heap_byte_size <= (_max_gen0_size + _max_gen1_size), "Total maximum heap sizes must be sum of generation maximum sizes"); |
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270 |
} |
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271 |
#endif // ASSERT |
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272 |
|
1 | 273 |
void GenCollectorPolicy::initialize_flags() { |
274 |
CollectorPolicy::initialize_flags(); |
|
275 |
||
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assert(_gen_alignment != 0, "Generation alignment not set up properly"); |
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277 |
assert(_heap_alignment >= _gen_alignment, |
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278 |
err_msg("heap_alignment: " SIZE_FORMAT " less than gen_alignment: " SIZE_FORMAT, |
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279 |
_heap_alignment, _gen_alignment)); |
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280 |
assert(_gen_alignment % _space_alignment == 0, |
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281 |
err_msg("gen_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT, |
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282 |
_gen_alignment, _space_alignment)); |
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283 |
assert(_heap_alignment % _gen_alignment == 0, |
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284 |
err_msg("heap_alignment: " SIZE_FORMAT " not aligned by gen_alignment: " SIZE_FORMAT, |
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285 |
_heap_alignment, _gen_alignment)); |
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|
286 |
|
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287 |
// All generational heaps have a youngest gen; handle those flags here |
1 | 288 |
|
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// Make sure the heap is large enough for two generations |
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290 |
uintx smallest_new_size = young_gen_size_lower_bound(); |
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291 |
uintx smallest_heap_size = align_size_up(smallest_new_size + align_size_up(_space_alignment, _gen_alignment), |
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292 |
_heap_alignment); |
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293 |
if (MaxHeapSize < smallest_heap_size) { |
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294 |
FLAG_SET_ERGO(uintx, MaxHeapSize, smallest_heap_size); |
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295 |
_max_heap_byte_size = MaxHeapSize; |
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296 |
} |
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297 |
// If needed, synchronize _min_heap_byte size and _initial_heap_byte_size |
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298 |
if (_min_heap_byte_size < smallest_heap_size) { |
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299 |
_min_heap_byte_size = smallest_heap_size; |
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300 |
if (InitialHeapSize < _min_heap_byte_size) { |
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301 |
FLAG_SET_ERGO(uintx, InitialHeapSize, smallest_heap_size); |
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302 |
_initial_heap_byte_size = smallest_heap_size; |
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303 |
} |
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304 |
} |
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|
305 |
|
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306 |
// Now take the actual NewSize into account. We will silently increase NewSize |
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307 |
// if the user specified a smaller or unaligned value. |
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308 |
smallest_new_size = MAX2(smallest_new_size, (uintx)align_size_down(NewSize, _gen_alignment)); |
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309 |
if (smallest_new_size != NewSize) { |
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310 |
// Do not use FLAG_SET_ERGO to update NewSize here, since this will override |
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311 |
// if NewSize was set on the command line or not. This information is needed |
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312 |
// later when setting the initial and minimum young generation size. |
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313 |
NewSize = smallest_new_size; |
1 | 314 |
} |
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315 |
_initial_gen0_size = NewSize; |
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|
316 |
|
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317 |
if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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318 |
uintx min_new_size = MAX2(_gen_alignment, _min_gen0_size); |
1 | 319 |
|
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320 |
if (MaxNewSize >= MaxHeapSize) { |
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321 |
// Make sure there is room for an old generation |
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322 |
uintx smaller_max_new_size = MaxHeapSize - _gen_alignment; |
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323 |
if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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324 |
warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or greater than the entire " |
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325 |
"heap (" SIZE_FORMAT "k). A new max generation size of " SIZE_FORMAT "k will be used.", |
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|
326 |
MaxNewSize/K, MaxHeapSize/K, smaller_max_new_size/K); |
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|
327 |
} |
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328 |
FLAG_SET_ERGO(uintx, MaxNewSize, smaller_max_new_size); |
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329 |
if (NewSize > MaxNewSize) { |
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330 |
FLAG_SET_ERGO(uintx, NewSize, MaxNewSize); |
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331 |
_initial_gen0_size = NewSize; |
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332 |
} |
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|
333 |
} else if (MaxNewSize < min_new_size) { |
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334 |
FLAG_SET_ERGO(uintx, MaxNewSize, min_new_size); |
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|
335 |
} else if (!is_size_aligned(MaxNewSize, _gen_alignment)) { |
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336 |
FLAG_SET_ERGO(uintx, MaxNewSize, align_size_down(MaxNewSize, _gen_alignment)); |
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|
337 |
} |
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338 |
_max_gen0_size = MaxNewSize; |
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|
339 |
} |
1 | 340 |
|
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341 |
if (NewSize > MaxNewSize) { |
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342 |
// At this point this should only happen if the user specifies a large NewSize and/or |
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343 |
// a small (but not too small) MaxNewSize. |
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344 |
if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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|
345 |
warning("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). " |
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|
346 |
"A new max generation size of " SIZE_FORMAT "k will be used.", |
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347 |
NewSize/K, MaxNewSize/K, NewSize/K); |
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348 |
} |
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349 |
FLAG_SET_ERGO(uintx, MaxNewSize, NewSize); |
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350 |
_max_gen0_size = MaxNewSize; |
1 | 351 |
} |
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352 |
|
1 | 353 |
if (SurvivorRatio < 1 || NewRatio < 1) { |
20399 | 354 |
vm_exit_during_initialization("Invalid young gen ratio specified"); |
1 | 355 |
} |
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|
356 |
|
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357 |
DEBUG_ONLY(GenCollectorPolicy::assert_flags();) |
1 | 358 |
} |
359 |
||
360 |
void TwoGenerationCollectorPolicy::initialize_flags() { |
|
361 |
GenCollectorPolicy::initialize_flags(); |
|
362 |
||
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|
363 |
if (!is_size_aligned(OldSize, _gen_alignment)) { |
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364 |
FLAG_SET_ERGO(uintx, OldSize, align_size_down(OldSize, _gen_alignment)); |
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365 |
} |
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366 |
|
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367 |
if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(MaxHeapSize)) { |
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368 |
// NewRatio will be used later to set the young generation size so we use |
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369 |
// it to calculate how big the heap should be based on the requested OldSize |
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370 |
// and NewRatio. |
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371 |
assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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372 |
size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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|
373 |
|
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374 |
calculated_heapsize = align_size_up(calculated_heapsize, _heap_alignment); |
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375 |
FLAG_SET_ERGO(uintx, MaxHeapSize, calculated_heapsize); |
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376 |
_max_heap_byte_size = MaxHeapSize; |
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377 |
FLAG_SET_ERGO(uintx, InitialHeapSize, calculated_heapsize); |
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|
378 |
_initial_heap_byte_size = InitialHeapSize; |
15494
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379 |
} |
1 | 380 |
|
22551 | 381 |
// Adjust NewSize and OldSize or MaxHeapSize to match each other |
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|
382 |
if (NewSize + OldSize > MaxHeapSize) { |
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|
383 |
if (_max_heap_size_cmdline) { |
22551 | 384 |
// Somebody has set a maximum heap size with the intention that we should not |
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385 |
// exceed it. Adjust New/OldSize as necessary. |
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|
386 |
uintx calculated_size = NewSize + OldSize; |
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|
387 |
double shrink_factor = (double) MaxHeapSize / calculated_size; |
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|
388 |
uintx smaller_new_size = align_size_down((uintx)(NewSize * shrink_factor), _gen_alignment); |
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|
389 |
FLAG_SET_ERGO(uintx, NewSize, MAX2(young_gen_size_lower_bound(), smaller_new_size)); |
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|
390 |
_initial_gen0_size = NewSize; |
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|
391 |
|
17322
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|
392 |
// OldSize is already aligned because above we aligned MaxHeapSize to |
21561
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|
393 |
// _heap_alignment, and we just made sure that NewSize is aligned to |
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|
394 |
// _gen_alignment. In initialize_flags() we verified that _heap_alignment |
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|
395 |
// is a multiple of _gen_alignment. |
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|
396 |
FLAG_SET_ERGO(uintx, OldSize, MaxHeapSize - NewSize); |
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|
397 |
} else { |
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|
398 |
FLAG_SET_ERGO(uintx, MaxHeapSize, align_size_up(NewSize + OldSize, _heap_alignment)); |
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|
399 |
_max_heap_byte_size = MaxHeapSize; |
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|
400 |
} |
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|
401 |
} |
17389 | 402 |
|
1 | 403 |
always_do_update_barrier = UseConcMarkSweepGC; |
404 |
||
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|
405 |
DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_flags();) |
1 | 406 |
} |
407 |
||
186
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|
408 |
// Values set on the command line win over any ergonomically |
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|
409 |
// set command line parameters. |
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|
410 |
// Ergonomic choice of parameters are done before this |
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|
411 |
// method is called. Values for command line parameters such as NewSize |
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|
412 |
// and MaxNewSize feed those ergonomic choices into this method. |
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|
413 |
// This method makes the final generation sizings consistent with |
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|
414 |
// themselves and with overall heap sizings. |
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|
415 |
// In the absence of explicitly set command line flags, policies |
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|
416 |
// such as the use of NewRatio are used to size the generation. |
1 | 417 |
void GenCollectorPolicy::initialize_size_info() { |
418 |
CollectorPolicy::initialize_size_info(); |
|
419 |
||
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|
420 |
// _space_alignment is used for alignment within a generation. |
186
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|
421 |
// There is additional alignment done down stream for some |
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|
422 |
// collectors that sometimes causes unwanted rounding up of |
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|
423 |
// generations sizes. |
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changeset
|
424 |
|
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changeset
|
425 |
// Determine maximum size of gen0 |
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changeset
|
426 |
|
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|
427 |
size_t max_new_size = 0; |
21561
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|
428 |
if (!FLAG_IS_DEFAULT(MaxNewSize)) { |
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|
429 |
max_new_size = MaxNewSize; |
1 | 430 |
} else { |
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|
431 |
max_new_size = scale_by_NewRatio_aligned(_max_heap_byte_size); |
186
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|
432 |
// Bound the maximum size by NewSize below (since it historically |
1 | 433 |
// would have been NewSize and because the NewRatio calculation could |
434 |
// yield a size that is too small) and bound it by MaxNewSize above. |
|
186
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|
435 |
// Ergonomics plays here by previously calculating the desired |
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|
436 |
// NewSize and MaxNewSize. |
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|
437 |
max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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|
438 |
} |
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changeset
|
439 |
assert(max_new_size > 0, "All paths should set max_new_size"); |
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changeset
|
440 |
|
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changeset
|
441 |
// Given the maximum gen0 size, determine the initial and |
8687
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|
442 |
// minimum gen0 sizes. |
186
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|
443 |
|
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|
444 |
if (_max_heap_byte_size == _min_heap_byte_size) { |
22551 | 445 |
// The maximum and minimum heap sizes are the same so the generations |
446 |
// minimum and initial must be the same as its maximum. |
|
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|
447 |
_min_gen0_size = max_new_size; |
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|
448 |
_initial_gen0_size = max_new_size; |
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|
449 |
_max_gen0_size = max_new_size; |
186
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|
450 |
} else { |
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|
451 |
size_t desired_new_size = 0; |
22776
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|
452 |
if (FLAG_IS_CMDLINE(NewSize)) { |
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|
453 |
// If NewSize is set on the command line, we must use it as |
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|
454 |
// the initial size and it also makes sense to use it as the |
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|
455 |
// lower limit. |
186
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|
456 |
_min_gen0_size = NewSize; |
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|
457 |
desired_new_size = NewSize; |
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|
458 |
max_new_size = MAX2(max_new_size, NewSize); |
22776
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|
459 |
} else if (FLAG_IS_ERGO(NewSize)) { |
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|
460 |
// If NewSize is set ergonomically, we should use it as a lower |
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|
461 |
// limit, but use NewRatio to calculate the initial size. |
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|
462 |
_min_gen0_size = NewSize; |
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|
463 |
desired_new_size = |
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|
464 |
MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
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|
465 |
max_new_size = MAX2(max_new_size, NewSize); |
186
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|
466 |
} else { |
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|
467 |
// For the case where NewSize is the default, use NewRatio |
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|
468 |
// to size the minimum and initial generation sizes. |
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changeset
|
469 |
// Use the default NewSize as the floor for these values. If |
22551 | 470 |
// NewRatio is overly large, the resulting sizes can be too small. |
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|
471 |
_min_gen0_size = MAX2(scale_by_NewRatio_aligned(_min_heap_byte_size), NewSize); |
186
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|
472 |
desired_new_size = |
20398
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|
473 |
MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize); |
186
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|
474 |
} |
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diff
changeset
|
475 |
|
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changeset
|
476 |
assert(_min_gen0_size > 0, "Sanity check"); |
20398
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|
477 |
_initial_gen0_size = desired_new_size; |
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|
478 |
_max_gen0_size = max_new_size; |
186
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|
479 |
|
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changeset
|
480 |
// At this point the desirable initial and minimum sizes have been |
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|
481 |
// determined without regard to the maximum sizes. |
32e6c95f8d9b
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changeset
|
482 |
|
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changeset
|
483 |
// Bound the sizes by the corresponding overall heap sizes. |
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|
484 |
_min_gen0_size = bound_minus_alignment(_min_gen0_size, _min_heap_byte_size); |
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|
485 |
_initial_gen0_size = bound_minus_alignment(_initial_gen0_size, _initial_heap_byte_size); |
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|
486 |
_max_gen0_size = bound_minus_alignment(_max_gen0_size, _max_heap_byte_size); |
186
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|
487 |
|
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|
488 |
// At this point all three sizes have been checked against the |
22551 | 489 |
// maximum sizes but have not been checked for consistency among the three. |
186
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|
490 |
|
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changeset
|
491 |
// Final check min <= initial <= max |
20398
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|
492 |
_min_gen0_size = MIN2(_min_gen0_size, _max_gen0_size); |
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|
493 |
_initial_gen0_size = MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size); |
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|
494 |
_min_gen0_size = MIN2(_min_gen0_size, _initial_gen0_size); |
1 | 495 |
} |
496 |
||
22551 | 497 |
// Write back to flags if necessary. |
21561
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|
498 |
if (NewSize != _initial_gen0_size) { |
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|
499 |
FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
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|
500 |
} |
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|
501 |
|
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|
502 |
if (MaxNewSize != _max_gen0_size) { |
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|
503 |
FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
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|
504 |
} |
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|
505 |
|
186
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|
506 |
if (PrintGCDetails && Verbose) { |
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|
507 |
gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
186
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|
508 |
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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|
509 |
_min_gen0_size, _initial_gen0_size, _max_gen0_size); |
186
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|
510 |
} |
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|
511 |
|
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|
512 |
DEBUG_ONLY(GenCollectorPolicy::assert_size_info();) |
186
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|
513 |
} |
1 | 514 |
|
186
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|
515 |
// Call this method during the sizing of the gen1 to make |
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changeset
|
516 |
// adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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changeset
|
517 |
// the most freedom in sizing because it is done before the |
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|
518 |
// policy for gen1 is applied. Once gen1 policies have been applied, |
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|
519 |
// there may be conflicts in the shape of the heap and this method |
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changeset
|
520 |
// is used to make the needed adjustments. The application of the |
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changeset
|
521 |
// policies could be more sophisticated (iterative for example) but |
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|
522 |
// keeping it simple also seems a worthwhile goal. |
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changeset
|
523 |
bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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|
524 |
size_t* gen1_size_ptr, |
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|
525 |
const size_t heap_size) { |
186
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|
526 |
bool result = false; |
15494
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6348447: Specifying -XX:OldSize crashes 64-bit VMs
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changeset
|
527 |
|
21567
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|
528 |
if ((*gen0_size_ptr + *gen1_size_ptr) > heap_size) { |
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|
529 |
uintx smallest_new_size = young_gen_size_lower_bound(); |
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|
530 |
if ((heap_size < (*gen0_size_ptr + _min_gen1_size)) && |
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|
531 |
(heap_size >= _min_gen1_size + smallest_new_size)) { |
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|
532 |
// Adjust gen0 down to accommodate _min_gen1_size |
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|
533 |
*gen0_size_ptr = align_size_down_bounded(heap_size - _min_gen1_size, _gen_alignment); |
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|
534 |
result = true; |
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changeset
|
535 |
} else { |
21561
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|
536 |
*gen1_size_ptr = align_size_down_bounded(heap_size - *gen0_size_ptr, _gen_alignment); |
186
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|
537 |
} |
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changeset
|
538 |
} |
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changeset
|
539 |
return result; |
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|
540 |
} |
1 | 541 |
|
186
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changeset
|
542 |
// Minimum sizes of the generations may be different than |
22551 | 543 |
// the initial sizes. An inconsistency is permitted here |
186
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|
544 |
// in the total size that can be specified explicitly by |
32e6c95f8d9b
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parents:
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changeset
|
545 |
// command line specification of OldSize and NewSize and |
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parents:
1
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changeset
|
546 |
// also a command line specification of -Xms. Issue a warning |
32e6c95f8d9b
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parents:
1
diff
changeset
|
547 |
// but allow the values to pass. |
1 | 548 |
|
549 |
void TwoGenerationCollectorPolicy::initialize_size_info() { |
|
550 |
GenCollectorPolicy::initialize_size_info(); |
|
551 |
||
186
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changeset
|
552 |
// At this point the minimum, initial and maximum sizes |
32e6c95f8d9b
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parents:
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changeset
|
553 |
// of the overall heap and of gen0 have been determined. |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
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changeset
|
554 |
// The maximum gen1 size can be determined from the maximum gen0 |
22551 | 555 |
// and maximum heap size since no explicit flags exist |
186
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changeset
|
556 |
// for setting the gen1 maximum. |
21561
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changeset
|
557 |
_max_gen1_size = MAX2(_max_heap_byte_size - _max_gen0_size, _gen_alignment); |
c619b1cb4554
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jwilhelm
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changeset
|
558 |
|
186
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changeset
|
559 |
// If no explicit command line flag has been set for the |
22551 | 560 |
// gen1 size, use what is left for gen1 |
21561
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jwilhelm
parents:
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diff
changeset
|
561 |
if (!FLAG_IS_CMDLINE(OldSize)) { |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
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diff
changeset
|
562 |
// The user has not specified any value but the ergonomics |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
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changeset
|
563 |
// may have chosen a value (which may or may not be consistent |
186
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parents:
1
diff
changeset
|
564 |
// with the overall heap size). In either case make |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
565 |
// the minimum, maximum and initial sizes consistent |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
566 |
// with the gen0 sizes and the overall heap sizes. |
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
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diff
changeset
|
567 |
_min_gen1_size = MAX2(_min_heap_byte_size - _min_gen0_size, _gen_alignment); |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
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diff
changeset
|
568 |
_initial_gen1_size = MAX2(_initial_heap_byte_size - _initial_gen0_size, _gen_alignment); |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
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diff
changeset
|
569 |
// _max_gen1_size has already been made consistent above |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
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diff
changeset
|
570 |
FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
186
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diff
changeset
|
571 |
} else { |
22551 | 572 |
// OldSize has been explicitly set on the command line. Use the |
186
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parents:
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diff
changeset
|
573 |
// OldSize and then determine the consequences. |
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
574 |
_min_gen1_size = MIN2(OldSize, _min_heap_byte_size - _min_gen0_size); |
20398
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diff
changeset
|
575 |
_initial_gen1_size = OldSize; |
186
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parents:
1
diff
changeset
|
576 |
|
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
577 |
// If the user has explicitly set an OldSize that is inconsistent |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
578 |
// with other command line flags, issue a warning. |
22551 | 579 |
// The generation minimums and the overall heap minimum should |
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
580 |
// be within one generation alignment. |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
581 |
if ((_min_gen1_size + _min_gen0_size + _gen_alignment) < _min_heap_byte_size) { |
1 | 582 |
warning("Inconsistency between minimum heap size and minimum " |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
583 |
"generation sizes: using minimum heap = " SIZE_FORMAT, |
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
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diff
changeset
|
584 |
_min_heap_byte_size); |
186
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parents:
1
diff
changeset
|
585 |
} |
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
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21559
diff
changeset
|
586 |
if (OldSize > _max_gen1_size) { |
186
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parents:
1
diff
changeset
|
587 |
warning("Inconsistency between maximum heap size and maximum " |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
588 |
"generation sizes: using maximum heap = " SIZE_FORMAT |
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
589 |
" -XX:OldSize flag is being ignored", |
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
590 |
_max_heap_byte_size); |
8687
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changeset
|
591 |
} |
186
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diff
changeset
|
592 |
// If there is an inconsistency between the OldSize and the minimum and/or |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
593 |
// initial size of gen0, since OldSize was explicitly set, OldSize wins. |
21567
938a7ca4d2aa
8028093: Initial young size is smaller than minimum young size
jwilhelm
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diff
changeset
|
594 |
if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, _min_heap_byte_size)) { |
186
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1
diff
changeset
|
595 |
if (PrintGCDetails && Verbose) { |
8687
264727307495
6896099: Integrate CMS heap ergo with default heap sizing ergo
ysr
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7419
diff
changeset
|
596 |
gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
186
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parents:
1
diff
changeset
|
597 |
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
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diff
changeset
|
598 |
_min_gen0_size, _initial_gen0_size, _max_gen0_size); |
186
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diff
changeset
|
599 |
} |
1 | 600 |
} |
22551 | 601 |
// The same as above for the old gen initial size. |
186
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1
diff
changeset
|
602 |
if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
21567
938a7ca4d2aa
8028093: Initial young size is smaller than minimum young size
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changeset
|
603 |
_initial_heap_byte_size)) { |
186
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1
diff
changeset
|
604 |
if (PrintGCDetails && Verbose) { |
8687
264727307495
6896099: Integrate CMS heap ergo with default heap sizing ergo
ysr
parents:
7419
diff
changeset
|
605 |
gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
186
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6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
606 |
SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
607 |
_min_gen0_size, _initial_gen0_size, _max_gen0_size); |
186
32e6c95f8d9b
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parents:
1
diff
changeset
|
608 |
} |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
609 |
} |
1 | 610 |
} |
22551 | 611 |
|
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
612 |
_min_gen1_size = MIN2(_min_gen1_size, _max_gen1_size); |
1 | 613 |
|
22551 | 614 |
// Make sure that min gen1 <= initial gen1 <= max gen1. |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
615 |
_initial_gen1_size = MAX2(_initial_gen1_size, _min_gen1_size); |
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
616 |
_initial_gen1_size = MIN2(_initial_gen1_size, _max_gen1_size); |
186
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parents:
1
diff
changeset
|
617 |
|
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
618 |
// Write back to flags if necessary |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
619 |
if (NewSize != _initial_gen0_size) { |
21566
4463f810db82
8027911: Assertion in the collector policy when running gc/arguments/TestMaxNewSize.java
jwilhelm
parents:
21561
diff
changeset
|
620 |
FLAG_SET_ERGO(uintx, NewSize, _initial_gen0_size); |
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
621 |
} |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
622 |
|
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
623 |
if (MaxNewSize != _max_gen0_size) { |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
624 |
FLAG_SET_ERGO(uintx, MaxNewSize, _max_gen0_size); |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
625 |
} |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
626 |
|
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
627 |
if (OldSize != _initial_gen1_size) { |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
628 |
FLAG_SET_ERGO(uintx, OldSize, _initial_gen1_size); |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
629 |
} |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
630 |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
631 |
if (PrintGCDetails && Verbose) { |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
632 |
gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
633 |
SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
20398
b206c580c45f
8025852: Remove unnecessary setters in collector policy classes
jwilhelm
parents:
20316
diff
changeset
|
634 |
_min_gen1_size, _initial_gen1_size, _max_gen1_size); |
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
635 |
} |
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
636 |
|
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
637 |
DEBUG_ONLY(TwoGenerationCollectorPolicy::assert_size_info();) |
1 | 638 |
} |
639 |
||
640 |
HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, |
|
641 |
bool is_tlab, |
|
642 |
bool* gc_overhead_limit_was_exceeded) { |
|
643 |
GenCollectedHeap *gch = GenCollectedHeap::heap(); |
|
644 |
||
645 |
debug_only(gch->check_for_valid_allocation_state()); |
|
646 |
assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
647 |
|
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
648 |
// In general gc_overhead_limit_was_exceeded should be false so |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
649 |
// set it so here and reset it to true only if the gc time |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
650 |
// limit is being exceeded as checked below. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
651 |
*gc_overhead_limit_was_exceeded = false; |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
652 |
|
1 | 653 |
HeapWord* result = NULL; |
654 |
||
22551 | 655 |
// Loop until the allocation is satisfied, or unsatisfied after GC. |
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15959
diff
changeset
|
656 |
for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
22551 | 657 |
HandleMark hm; // Discard any handles allocated in each iteration. |
1 | 658 |
|
659 |
// First allocation attempt is lock-free. |
|
660 |
Generation *gen0 = gch->get_gen(0); |
|
661 |
assert(gen0->supports_inline_contig_alloc(), |
|
662 |
"Otherwise, must do alloc within heap lock"); |
|
663 |
if (gen0->should_allocate(size, is_tlab)) { |
|
664 |
result = gen0->par_allocate(size, is_tlab); |
|
665 |
if (result != NULL) { |
|
666 |
assert(gch->is_in_reserved(result), "result not in heap"); |
|
667 |
return result; |
|
668 |
} |
|
669 |
} |
|
22551 | 670 |
unsigned int gc_count_before; // Read inside the Heap_lock locked region. |
1 | 671 |
{ |
672 |
MutexLocker ml(Heap_lock); |
|
673 |
if (PrintGC && Verbose) { |
|
674 |
gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" |
|
675 |
" attempting locked slow path allocation"); |
|
676 |
} |
|
677 |
// Note that only large objects get a shot at being |
|
678 |
// allocated in later generations. |
|
679 |
bool first_only = ! should_try_older_generation_allocation(size); |
|
680 |
||
681 |
result = gch->attempt_allocation(size, is_tlab, first_only); |
|
682 |
if (result != NULL) { |
|
683 |
assert(gch->is_in_reserved(result), "result not in heap"); |
|
684 |
return result; |
|
685 |
} |
|
686 |
||
687 |
if (GC_locker::is_active_and_needs_gc()) { |
|
688 |
if (is_tlab) { |
|
22551 | 689 |
return NULL; // Caller will retry allocating individual object. |
1 | 690 |
} |
691 |
if (!gch->is_maximal_no_gc()) { |
|
22551 | 692 |
// Try and expand heap to satisfy request. |
1 | 693 |
result = expand_heap_and_allocate(size, is_tlab); |
22551 | 694 |
// Result could be null if we are out of space. |
1 | 695 |
if (result != NULL) { |
696 |
return result; |
|
697 |
} |
|
698 |
} |
|
699 |
||
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15959
diff
changeset
|
700 |
if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
22551 | 701 |
return NULL; // We didn't get to do a GC and we didn't get any memory. |
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15959
diff
changeset
|
702 |
} |
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15959
diff
changeset
|
703 |
|
1 | 704 |
// If this thread is not in a jni critical section, we stall |
705 |
// the requestor until the critical section has cleared and |
|
706 |
// GC allowed. When the critical section clears, a GC is |
|
707 |
// initiated by the last thread exiting the critical section; so |
|
708 |
// we retry the allocation sequence from the beginning of the loop, |
|
709 |
// rather than causing more, now probably unnecessary, GC attempts. |
|
710 |
JavaThread* jthr = JavaThread::current(); |
|
711 |
if (!jthr->in_critical()) { |
|
712 |
MutexUnlocker mul(Heap_lock); |
|
713 |
// Wait for JNI critical section to be exited |
|
714 |
GC_locker::stall_until_clear(); |
|
16604
800a65bfe347
7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine
mgerdin
parents:
15959
diff
changeset
|
715 |
gclocker_stalled_count += 1; |
1 | 716 |
continue; |
717 |
} else { |
|
718 |
if (CheckJNICalls) { |
|
719 |
fatal("Possible deadlock due to allocating while" |
|
720 |
" in jni critical section"); |
|
721 |
} |
|
722 |
return NULL; |
|
723 |
} |
|
724 |
} |
|
725 |
||
726 |
// Read the gc count while the heap lock is held. |
|
727 |
gc_count_before = Universe::heap()->total_collections(); |
|
728 |
} |
|
729 |
||
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
parents:
21559
diff
changeset
|
730 |
VM_GenCollectForAllocation op(size, is_tlab, gc_count_before); |
1 | 731 |
VMThread::execute(&op); |
732 |
if (op.prologue_succeeded()) { |
|
733 |
result = op.result(); |
|
734 |
if (op.gc_locked()) { |
|
735 |
assert(result == NULL, "must be NULL if gc_locked() is true"); |
|
22551 | 736 |
continue; // Retry and/or stall as necessary. |
1 | 737 |
} |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
738 |
|
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
739 |
// Allocation has failed and a collection |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
740 |
// has been done. If the gc time limit was exceeded the |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
741 |
// this time, return NULL so that an out-of-memory |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
742 |
// will be thrown. Clear gc_overhead_limit_exceeded |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
743 |
// so that the overhead exceeded does not persist. |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
744 |
|
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
745 |
const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
746 |
const bool softrefs_clear = all_soft_refs_clear(); |
15959
9a29e0e3a633
6976528: PS: assert(!limit_exceeded || softrefs_clear) failed: Should have been cleared
jmasa
parents:
15748
diff
changeset
|
747 |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
748 |
if (limit_exceeded && softrefs_clear) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
749 |
*gc_overhead_limit_was_exceeded = true; |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
750 |
size_policy()->set_gc_overhead_limit_exceeded(false); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
751 |
if (op.result() != NULL) { |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
752 |
CollectedHeap::fill_with_object(op.result(), size); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
753 |
} |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
754 |
return NULL; |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
755 |
} |
1 | 756 |
assert(result == NULL || gch->is_in_reserved(result), |
757 |
"result not in heap"); |
|
758 |
return result; |
|
759 |
} |
|
760 |
||
761 |
// Give a warning if we seem to be looping forever. |
|
762 |
if ((QueuedAllocationWarningCount > 0) && |
|
763 |
(try_count % QueuedAllocationWarningCount == 0)) { |
|
764 |
warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" |
|
765 |
" size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); |
|
766 |
} |
|
767 |
} |
|
768 |
} |
|
769 |
||
770 |
HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, |
|
771 |
bool is_tlab) { |
|
772 |
GenCollectedHeap *gch = GenCollectedHeap::heap(); |
|
773 |
HeapWord* result = NULL; |
|
774 |
for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { |
|
775 |
Generation *gen = gch->get_gen(i); |
|
776 |
if (gen->should_allocate(size, is_tlab)) { |
|
777 |
result = gen->expand_and_allocate(size, is_tlab); |
|
778 |
} |
|
779 |
} |
|
780 |
assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); |
|
781 |
return result; |
|
782 |
} |
|
783 |
||
784 |
HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, |
|
785 |
bool is_tlab) { |
|
786 |
GenCollectedHeap *gch = GenCollectedHeap::heap(); |
|
787 |
GCCauseSetter x(gch, GCCause::_allocation_failure); |
|
788 |
HeapWord* result = NULL; |
|
789 |
||
790 |
assert(size != 0, "Precondition violated"); |
|
791 |
if (GC_locker::is_active_and_needs_gc()) { |
|
792 |
// GC locker is active; instead of a collection we will attempt |
|
793 |
// to expand the heap, if there's room for expansion. |
|
794 |
if (!gch->is_maximal_no_gc()) { |
|
795 |
result = expand_heap_and_allocate(size, is_tlab); |
|
796 |
} |
|
22551 | 797 |
return result; // Could be null if we are out of space. |
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
798 |
} else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
1 | 799 |
// Do an incremental collection. |
800 |
gch->do_collection(false /* full */, |
|
801 |
false /* clear_all_soft_refs */, |
|
802 |
size /* size */, |
|
803 |
is_tlab /* is_tlab */, |
|
804 |
number_of_generations() - 1 /* max_level */); |
|
805 |
} else { |
|
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
806 |
if (Verbose && PrintGCDetails) { |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
807 |
gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
808 |
} |
1 | 809 |
// Try a full collection; see delta for bug id 6266275 |
810 |
// for the original code and why this has been simplified |
|
811 |
// with from-space allocation criteria modified and |
|
812 |
// such allocation moved out of the safepoint path. |
|
813 |
gch->do_collection(true /* full */, |
|
814 |
false /* clear_all_soft_refs */, |
|
815 |
size /* size */, |
|
816 |
is_tlab /* is_tlab */, |
|
817 |
number_of_generations() - 1 /* max_level */); |
|
818 |
} |
|
819 |
||
820 |
result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); |
|
821 |
||
822 |
if (result != NULL) { |
|
823 |
assert(gch->is_in_reserved(result), "result not in heap"); |
|
824 |
return result; |
|
825 |
} |
|
826 |
||
827 |
// OK, collection failed, try expansion. |
|
828 |
result = expand_heap_and_allocate(size, is_tlab); |
|
829 |
if (result != NULL) { |
|
830 |
return result; |
|
831 |
} |
|
832 |
||
833 |
// If we reach this point, we're really out of memory. Try every trick |
|
834 |
// we can to reclaim memory. Force collection of soft references. Force |
|
835 |
// a complete compaction of the heap. Any additional methods for finding |
|
836 |
// free memory should be here, especially if they are expensive. If this |
|
837 |
// attempt fails, an OOM exception will be thrown. |
|
838 |
{ |
|
17392
2f967c0e4246
6843347: Boundary values in some public GC options cause crashes
tschatzl
parents:
17389
diff
changeset
|
839 |
UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
1 | 840 |
|
841 |
gch->do_collection(true /* full */, |
|
842 |
true /* clear_all_soft_refs */, |
|
843 |
size /* size */, |
|
844 |
is_tlab /* is_tlab */, |
|
845 |
number_of_generations() - 1 /* max_level */); |
|
846 |
} |
|
847 |
||
848 |
result = gch->attempt_allocation(size, is_tlab, false /* first_only */); |
|
849 |
if (result != NULL) { |
|
850 |
assert(gch->is_in_reserved(result), "result not in heap"); |
|
851 |
return result; |
|
852 |
} |
|
853 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
854 |
assert(!should_clear_all_soft_refs(), |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
855 |
"Flag should have been handled and cleared prior to this point"); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4434
diff
changeset
|
856 |
|
1 | 857 |
// What else? We might try synchronous finalization later. If the total |
858 |
// space available is large enough for the allocation, then a more |
|
859 |
// complete compaction phase than we've tried so far might be |
|
860 |
// appropriate. |
|
861 |
return NULL; |
|
862 |
} |
|
863 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
864 |
MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
865 |
ClassLoaderData* loader_data, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
866 |
size_t word_size, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
867 |
Metaspace::MetadataType mdtype) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
868 |
uint loop_count = 0; |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
869 |
uint gc_count = 0; |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
870 |
uint full_gc_count = 0; |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
871 |
|
14291
c8e69e83977f
8000988: VM deadlock when running btree006 on windows-i586
jmasa
parents:
13755
diff
changeset
|
872 |
assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
c8e69e83977f
8000988: VM deadlock when running btree006 on windows-i586
jmasa
parents:
13755
diff
changeset
|
873 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
874 |
do { |
13755
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
875 |
MetaWord* result = NULL; |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
876 |
if (GC_locker::is_active_and_needs_gc()) { |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
877 |
// If the GC_locker is active, just expand and allocate. |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
878 |
// If that does not succeed, wait if this thread is not |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
879 |
// in a critical section itself. |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
880 |
result = |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
881 |
loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
882 |
mdtype); |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
883 |
if (result != NULL) { |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
884 |
return result; |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
885 |
} |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
886 |
JavaThread* jthr = JavaThread::current(); |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
887 |
if (!jthr->in_critical()) { |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
888 |
// Wait for JNI critical section to be exited |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
889 |
GC_locker::stall_until_clear(); |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
890 |
// The GC invoked by the last thread leaving the critical |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
891 |
// section will be a young collection and a full collection |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
892 |
// is (currently) needed for unloading classes so continue |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
893 |
// to the next iteration to get a full GC. |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
894 |
continue; |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
895 |
} else { |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
896 |
if (CheckJNICalls) { |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
897 |
fatal("Possible deadlock due to allocating while" |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
898 |
" in jni critical section"); |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
899 |
} |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
900 |
return NULL; |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
901 |
} |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
902 |
} |
a00f5de57d30
7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently
jmasa
parents:
13728
diff
changeset
|
903 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
904 |
{ // Need lock to get self consistent gc_count's |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
905 |
MutexLocker ml(Heap_lock); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
906 |
gc_count = Universe::heap()->total_collections(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
907 |
full_gc_count = Universe::heap()->total_full_collections(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
908 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
909 |
|
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
910 |
// Generate a VM operation |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
911 |
VM_CollectForMetadataAllocation op(loader_data, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
912 |
word_size, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
913 |
mdtype, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
914 |
gc_count, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
915 |
full_gc_count, |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
916 |
GCCause::_metadata_GC_threshold); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
917 |
VMThread::execute(&op); |
15086
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14583
diff
changeset
|
918 |
|
22551 | 919 |
// If GC was locked out, try again. Check before checking success because the |
920 |
// prologue could have succeeded and the GC still have been locked out. |
|
15086
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14583
diff
changeset
|
921 |
if (op.gc_locked()) { |
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14583
diff
changeset
|
922 |
continue; |
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14583
diff
changeset
|
923 |
} |
2bfd799e9147
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
14583
diff
changeset
|
924 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
925 |
if (op.prologue_succeeded()) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
926 |
return op.result(); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
927 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
928 |
loop_count++; |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
929 |
if ((QueuedAllocationWarningCount > 0) && |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
930 |
(loop_count % QueuedAllocationWarningCount == 0)) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
931 |
warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
932 |
" size=%d", loop_count, word_size); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
933 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
934 |
} while (true); // Until a GC is done |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
935 |
} |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
10565
diff
changeset
|
936 |
|
1 | 937 |
// Return true if any of the following is true: |
938 |
// . the allocation won't fit into the current young gen heap |
|
939 |
// . gc locker is occupied (jni critical section) |
|
940 |
// . heap memory is tight -- the most recent previous collection |
|
941 |
// was a full collection because a partial collection (would |
|
942 |
// have) failed and is likely to fail again |
|
943 |
bool GenCollectorPolicy::should_try_older_generation_allocation( |
|
944 |
size_t word_size) const { |
|
945 |
GenCollectedHeap* gch = GenCollectedHeap::heap(); |
|
946 |
size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); |
|
947 |
return (word_size > heap_word_size(gen0_capacity)) |
|
6985
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6465
diff
changeset
|
948 |
|| GC_locker::is_active_and_needs_gc() |
e9364ec299ac
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
6465
diff
changeset
|
949 |
|| gch->incremental_collection_failed(); |
1 | 950 |
} |
951 |
||
952 |
||
953 |
// |
|
954 |
// MarkSweepPolicy methods |
|
955 |
// |
|
956 |
||
21561
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
957 |
void MarkSweepPolicy::initialize_alignments() { |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
958 |
_space_alignment = _gen_alignment = (uintx)Generation::GenGrain; |
c619b1cb4554
8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking
jwilhelm
parents:
21560
diff
changeset
|
959 |
_heap_alignment = compute_heap_alignment(); |
1 | 960 |
} |
961 |
||
962 |
void MarkSweepPolicy::initialize_generations() { |
|
17376
4ee999c3c007
8012902: remove use of global operator new - take 2
minqi
parents:
17322
diff
changeset
|
963 |
_generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
parents:
21559
diff
changeset
|
964 |
if (_generations == NULL) { |
1 | 965 |
vm_exit_during_initialization("Unable to allocate gen spec"); |
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
parents:
21559
diff
changeset
|
966 |
} |
1 | 967 |
|
15091
826cff1f58f5
8005396: Use ParNew with only one thread instead of DefNew as default for CMS on single CPU machines
brutisso
parents:
15086
diff
changeset
|
968 |
if (UseParNewGC) { |
1 | 969 |
_generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
970 |
} else { |
|
971 |
_generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); |
|
972 |
} |
|
973 |
_generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); |
|
974 |
||
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
parents:
21559
diff
changeset
|
975 |
if (_generations[0] == NULL || _generations[1] == NULL) { |
1 | 976 |
vm_exit_during_initialization("Unable to allocate gen spec"); |
21560
b3ae3ba25ebb
8026853: Prepare GC code for collector policy regression fix
jwilhelm
parents:
21559
diff
changeset
|
977 |
} |
1 | 978 |
} |
979 |
||
980 |
void MarkSweepPolicy::initialize_gc_policy_counters() { |
|
22551 | 981 |
// Initialize the policy counters - 2 collectors, 3 generations. |
15091
826cff1f58f5
8005396: Use ParNew with only one thread instead of DefNew as default for CMS on single CPU machines
brutisso
parents:
15086
diff
changeset
|
982 |
if (UseParNewGC) { |
1 | 983 |
_gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
15091
826cff1f58f5
8005396: Use ParNew with only one thread instead of DefNew as default for CMS on single CPU machines
brutisso
parents:
15086
diff
changeset
|
984 |
} else { |
1 | 985 |
_gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
986 |
} |
|
987 |
} |
|
22776
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
988 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
989 |
/////////////// Unit tests /////////////// |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
990 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
991 |
#ifndef PRODUCT |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
992 |
// Testing that the NewSize flag is handled correct is hard because it |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
993 |
// depends on so many other configurable variables. This test only tries to |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
994 |
// verify that there are some basic rules for NewSize honored by the policies. |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
995 |
class TestGenCollectorPolicy { |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
996 |
public: |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
997 |
static void test() { |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
998 |
size_t flag_value; |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
999 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1000 |
save_flags(); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1001 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1002 |
// Set some limits that makes the math simple. |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1003 |
FLAG_SET_ERGO(uintx, MaxHeapSize, 180 * M); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1004 |
FLAG_SET_ERGO(uintx, InitialHeapSize, 120 * M); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1005 |
Arguments::set_min_heap_size(40 * M); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1006 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1007 |
// If NewSize is set on the command line, it should be used |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1008 |
// for both min and initial young size if less than min heap. |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1009 |
flag_value = 20 * M; |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1010 |
FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1011 |
verify_min(flag_value); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1012 |
verify_initial(flag_value); |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1013 |
|
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1014 |
// If NewSize is set on command line, but is larger than the min |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1015 |
// heap size, it should only be used for initial young size. |
d99c54477401
8033426: Scale initial NewSize using NewRatio if not set on command line
sjohanss
parents:
22551
diff
changeset
|
1016 |
flag_value = 80 * M; |
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|
1017 |
FLAG_SET_CMDLINE(uintx, NewSize, flag_value); |
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|
1018 |
verify_initial(flag_value); |
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|
1019 |
|
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|
1020 |
// If NewSize has been ergonomically set, the collector policy |
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|
1021 |
// should use it for min but calculate the initial young size |
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|
1022 |
// using NewRatio. |
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|
1023 |
flag_value = 20 * M; |
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|
1024 |
FLAG_SET_ERGO(uintx, NewSize, flag_value); |
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|
1025 |
verify_min(flag_value); |
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|
1026 |
verify_scaled_initial(InitialHeapSize); |
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|
1027 |
|
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|
1028 |
restore_flags(); |
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changeset
|
1029 |
|
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|
1030 |
} |
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changeset
|
1031 |
|
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|
1032 |
static void verify_min(size_t expected) { |
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|
1033 |
MarkSweepPolicy msp; |
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|
1034 |
msp.initialize_all(); |
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|
1035 |
|
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|
1036 |
assert(msp.min_gen0_size() <= expected, err_msg("%zu > %zu", msp.min_gen0_size(), expected)); |
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|
1037 |
} |
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|
1038 |
|
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|
1039 |
static void verify_initial(size_t expected) { |
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|
1040 |
MarkSweepPolicy msp; |
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|
1041 |
msp.initialize_all(); |
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changeset
|
1042 |
|
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|
1043 |
assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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|
1044 |
} |
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changeset
|
1045 |
|
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|
1046 |
static void verify_scaled_initial(size_t initial_heap_size) { |
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|
1047 |
MarkSweepPolicy msp; |
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|
1048 |
msp.initialize_all(); |
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changeset
|
1049 |
|
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|
1050 |
size_t expected = msp.scale_by_NewRatio_aligned(initial_heap_size); |
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|
1051 |
assert(msp.initial_gen0_size() == expected, err_msg("%zu != %zu", msp.initial_gen0_size(), expected)); |
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|
1052 |
assert(FLAG_IS_ERGO(NewSize) && NewSize == expected, |
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|
1053 |
err_msg("NewSize should have been set ergonomically to %zu, but was %zu", expected, NewSize)); |
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changeset
|
1054 |
} |
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changeset
|
1055 |
|
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changeset
|
1056 |
private: |
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changeset
|
1057 |
static size_t original_InitialHeapSize; |
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|
1058 |
static size_t original_MaxHeapSize; |
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|
1059 |
static size_t original_MaxNewSize; |
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|
1060 |
static size_t original_MinHeapDeltaBytes; |
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changeset
|
1061 |
static size_t original_NewSize; |
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|
1062 |
static size_t original_OldSize; |
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changeset
|
1063 |
|
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|
1064 |
static void save_flags() { |
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|
1065 |
original_InitialHeapSize = InitialHeapSize; |
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changeset
|
1066 |
original_MaxHeapSize = MaxHeapSize; |
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|
1067 |
original_MaxNewSize = MaxNewSize; |
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|
1068 |
original_MinHeapDeltaBytes = MinHeapDeltaBytes; |
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changeset
|
1069 |
original_NewSize = NewSize; |
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changeset
|
1070 |
original_OldSize = OldSize; |
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changeset
|
1071 |
} |
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changeset
|
1072 |
|
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changeset
|
1073 |
static void restore_flags() { |
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changeset
|
1074 |
InitialHeapSize = original_InitialHeapSize; |
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changeset
|
1075 |
MaxHeapSize = original_MaxHeapSize; |
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changeset
|
1076 |
MaxNewSize = original_MaxNewSize; |
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changeset
|
1077 |
MinHeapDeltaBytes = original_MinHeapDeltaBytes; |
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changeset
|
1078 |
NewSize = original_NewSize; |
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changeset
|
1079 |
OldSize = original_OldSize; |
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changeset
|
1080 |
} |
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changeset
|
1081 |
}; |
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changeset
|
1082 |
|
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changeset
|
1083 |
size_t TestGenCollectorPolicy::original_InitialHeapSize = 0; |
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changeset
|
1084 |
size_t TestGenCollectorPolicy::original_MaxHeapSize = 0; |
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changeset
|
1085 |
size_t TestGenCollectorPolicy::original_MaxNewSize = 0; |
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changeset
|
1086 |
size_t TestGenCollectorPolicy::original_MinHeapDeltaBytes = 0; |
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changeset
|
1087 |
size_t TestGenCollectorPolicy::original_NewSize = 0; |
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changeset
|
1088 |
size_t TestGenCollectorPolicy::original_OldSize = 0; |
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changeset
|
1089 |
|
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changeset
|
1090 |
void TestNewSize_test() { |
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changeset
|
1091 |
TestGenCollectorPolicy::test(); |
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changeset
|
1092 |
} |
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changeset
|
1093 |
|
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changeset
|
1094 |
#endif |