Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/generationSpec.hpp @ 20304:a22acf6d7598
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
author | tschatzl |
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date | Mon, 21 Jul 2014 10:00:31 +0200 |
parents | da91efe96a93 |
children |
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/* * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP #include "memory/generation.hpp" // The specification of a generation. This class also encapsulates // some generation-specific behavior. This is done here rather than as a // virtual function of Generation because these methods are needed in // initialization of the Generations. class GenerationSpec : public CHeapObj<mtGC> { friend class VMStructs; private: Generation::Name _name; size_t _init_size; size_t _max_size; public: GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) { _name = name; _init_size = init_size; _max_size = max_size; } Generation* init(ReservedSpace rs, int level, GenRemSet* remset); // Accessors Generation::Name name() const { return _name; } size_t init_size() const { return _init_size; } void set_init_size(size_t size) { _init_size = size; } size_t max_size() const { return _max_size; } void set_max_size(size_t size) { _max_size = size; } // Alignment void align(size_t alignment) { set_init_size(align_size_up(init_size(), alignment)); set_max_size(align_size_up(max_size(), alignment)); } // Return the number of regions contained in the generation which // might need to be independently covered by a remembered set. virtual int n_covered_regions() const { return 1; } }; typedef GenerationSpec* GenerationSpecPtr; #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP