author | lkorinth |
Wed, 13 Nov 2019 11:37:29 +0100 | |
changeset 59053 | ba6c248cae19 |
parent 55308 | 871bc449ce06 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. |
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* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. |
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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/shared/cardTableRS.hpp" |
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#include "gc/shared/gcArguments.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/arguments.hpp" |
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#include "runtime/globals.hpp" |
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#include "runtime/globals_extension.hpp" |
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#include "utilities/defaultStream.hpp" |
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#include "utilities/macros.hpp" |
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size_t HeapAlignment = 0; |
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size_t SpaceAlignment = 0; |
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void GCArguments::initialize() { |
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if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { |
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MarkSweepAlwaysCompactCount = 1; // Move objects every gc. |
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} |
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|
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if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { |
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FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); |
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} |
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|
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if (GCTimeLimit == 100) { |
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// Turn off gc-overhead-limit-exceeded checks |
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FLAG_SET_DEFAULT(UseGCOverheadLimit, false); |
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} |
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|
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if (MinHeapFreeRatio == 100) { |
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// Keeping the heap 100% free is hard ;-) so limit it to 99%. |
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FLAG_SET_ERGO(MinHeapFreeRatio, 99); |
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} |
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|
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if (!ClassUnloading) { |
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// If class unloading is disabled, also disable concurrent class unloading. |
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FLAG_SET_CMDLINE(ClassUnloadingWithConcurrentMark, false); |
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} |
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if (!FLAG_IS_DEFAULT(AllocateOldGenAt)) { |
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// CompressedOops not supported when AllocateOldGenAt is set. |
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LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); |
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LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); |
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// When AllocateOldGenAt is set, we cannot use largepages for entire heap memory. |
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// Only young gen which is allocated in dram can use large pages, but we currently don't support that. |
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FLAG_SET_DEFAULT(UseLargePages, false); |
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} |
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} |
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void GCArguments::initialize_heap_sizes() { |
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initialize_alignments(); |
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initialize_heap_flags_and_sizes(); |
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initialize_size_info(); |
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} |
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size_t GCArguments::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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size_t alignment = CardTableRS::ct_max_alignment_constraint(); |
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|
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if (UseLargePages) { |
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// 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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} |
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return alignment; |
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} |
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bool GCArguments::check_args_consistency() { |
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bool status = true; |
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if (!FLAG_IS_DEFAULT(AllocateHeapAt) && !FLAG_IS_DEFAULT(AllocateOldGenAt)) { |
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jio_fprintf(defaultStream::error_stream(), |
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"AllocateHeapAt and AllocateOldGenAt cannot be used together.\n"); |
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status = false; |
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} |
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if (!FLAG_IS_DEFAULT(AllocateOldGenAt) && (UseSerialGC || UseEpsilonGC || UseZGC)) { |
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jio_fprintf(defaultStream::error_stream(), |
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"AllocateOldGenAt is not supported for selected GC.\n"); |
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status = false; |
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} |
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return status; |
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} |
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#ifdef ASSERT |
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void GCArguments::assert_flags() { |
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assert(InitialHeapSize <= MaxHeapSize, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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assert(InitialHeapSize % HeapAlignment == 0, "InitialHeapSize alignment"); |
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assert(MaxHeapSize % HeapAlignment == 0, "MaxHeapSize alignment"); |
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} |
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void GCArguments::assert_size_info() { |
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assert(MaxHeapSize >= MinHeapSize, "Ergonomics decided on incompatible minimum and maximum heap sizes"); |
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assert(InitialHeapSize >= MinHeapSize, "Ergonomics decided on incompatible initial and minimum heap sizes"); |
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assert(MaxHeapSize >= InitialHeapSize, "Ergonomics decided on incompatible initial and maximum heap sizes"); |
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assert(MinHeapSize % HeapAlignment == 0, "MinHeapSize alignment"); |
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assert(InitialHeapSize % HeapAlignment == 0, "InitialHeapSize alignment"); |
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assert(MaxHeapSize % HeapAlignment == 0, "MaxHeapSize alignment"); |
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} |
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#endif // ASSERT |
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|
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void GCArguments::initialize_size_info() { |
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log_debug(gc, heap)("Minimum heap " SIZE_FORMAT " Initial heap " SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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MinHeapSize, InitialHeapSize, MaxHeapSize); |
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|
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DEBUG_ONLY(assert_size_info();) |
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} |
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|
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void GCArguments::initialize_heap_flags_and_sizes() { |
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assert(SpaceAlignment != 0, "Space alignment not set up properly"); |
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assert(HeapAlignment != 0, "Heap alignment not set up properly"); |
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assert(HeapAlignment >= SpaceAlignment, |
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"HeapAlignment: " SIZE_FORMAT " less than SpaceAlignment: " SIZE_FORMAT, |
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HeapAlignment, SpaceAlignment); |
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assert(HeapAlignment % SpaceAlignment == 0, |
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"HeapAlignment: " SIZE_FORMAT " not aligned by SpaceAlignment: " SIZE_FORMAT, |
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HeapAlignment, SpaceAlignment); |
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|
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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 (FLAG_IS_CMDLINE(MinHeapSize) && MaxHeapSize < MinHeapSize) { |
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vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
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} |
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} |
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// Check heap parameter properties |
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if (MaxHeapSize < 2 * M) { |
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vm_exit_during_initialization("Too small maximum heap"); |
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} |
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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 (MinHeapSize < M) { |
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vm_exit_during_initialization("Too small minimum heap"); |
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} |
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// User inputs from -Xmx and -Xms must be aligned |
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// Write back to flags if the values changed |
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if (!is_aligned(MinHeapSize, HeapAlignment)) { |
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FLAG_SET_ERGO(MinHeapSize, align_up(MinHeapSize, HeapAlignment)); |
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} |
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if (!is_aligned(InitialHeapSize, HeapAlignment)) { |
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FLAG_SET_ERGO(InitialHeapSize, align_up(InitialHeapSize, HeapAlignment)); |
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} |
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if (!is_aligned(MaxHeapSize, HeapAlignment)) { |
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FLAG_SET_ERGO(MaxHeapSize, align_up(MaxHeapSize, HeapAlignment)); |
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} |
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|
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if (FLAG_IS_CMDLINE(InitialHeapSize) && FLAG_IS_CMDLINE(MinHeapSize) && |
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InitialHeapSize < MinHeapSize) { |
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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(MaxHeapSize, InitialHeapSize); |
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} else if (!FLAG_IS_DEFAULT(MaxHeapSize) && InitialHeapSize > MaxHeapSize) { |
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FLAG_SET_ERGO(InitialHeapSize, MaxHeapSize); |
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if (InitialHeapSize < MinHeapSize) { |
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FLAG_SET_ERGO(MinHeapSize, InitialHeapSize); |
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} |
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} |
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if (FLAG_IS_DEFAULT(SoftMaxHeapSize)) { |
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FLAG_SET_ERGO(SoftMaxHeapSize, MaxHeapSize); |
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} |
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||
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FLAG_SET_ERGO(MinHeapDeltaBytes, align_up(MinHeapDeltaBytes, SpaceAlignment)); |
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DEBUG_ONLY(assert_flags();) |
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} |