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77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
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* Copyright (c) 2025, 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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#include "gc/serial/serialArguments.hpp"
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#include "gc/serial/serialHeap.hpp"
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#include "gc/shared/fullGCForwarding.hpp"
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#include "gc/shared/gcArguments.hpp"
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static size_t 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 = CardTable::ct_max_alignment_constraint();
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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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void SerialArguments::initialize_alignments() {
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// Initialize card size before initializing alignments
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CardTable::initialize_card_size();
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SpaceAlignment = (size_t)Generation::GenGrain;
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HeapAlignment = compute_heap_alignment();
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}
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void SerialArguments::initialize() {
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GCArguments::initialize();
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FullGCForwarding::initialize_flags(MaxHeapSize);
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}
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size_t SerialArguments::conservative_max_heap_alignment() {
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return MAX2((size_t)Generation::GenGrain, compute_heap_alignment());
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}
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CollectedHeap* SerialArguments::create_heap() {
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return new SerialHeap();
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}
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size_t SerialArguments::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 3 * SpaceAlignment;
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}
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size_t SerialArguments::old_gen_size_lower_bound() {
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return SpaceAlignment;
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}
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