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112 lines
4.5 KiB
C++
112 lines
4.5 KiB
C++
/*
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* Copyright (c) 2011, 2020, 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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#ifndef SHARE_MEMORY_CLASSLOADERMETASPACE_HPP
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#define SHARE_MEMORY_CLASSLOADERMETASPACE_HPP
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#include "memory/allocation.hpp"
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#include "memory/metaspace.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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class outputStream;
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namespace metaspace {
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struct ClmsStats;
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class MetaspaceArena;
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}
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// A ClassLoaderMetaspace manages MetaspaceArena(s) for a CLD.
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//
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// A CLD owns one MetaspaceArena if UseCompressedClassPointers is false. Otherwise
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// it owns two - one for the Klass* objects from the class space, one for the other
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// types of MetaspaceObjs from the non-class space.
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//
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// +------+ +----------------------+ +-------------------+
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// | CLD | ---> | ClassLoaderMetaspace | ----> | (non class) Arena |
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// +------+ +----------------------+ | +-------------------+ allocation top
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// | | v
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// | + chunk -- chunk ... -- chunk
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// |
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// | +-------------------+
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// +--> | (class) Arena |
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// +-------------------+
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// |
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// + chunk ... chunk
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// ^
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// alloc top
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//
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class ClassLoaderMetaspace : public CHeapObj<mtClass> {
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// A reference to an outside lock, held by the CLD.
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Mutex* const _lock;
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const Metaspace::MetaspaceType _space_type;
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// Arena for allocations from non-class metaspace
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// (resp. for all allocations if -XX:-UseCompressedClassPointers).
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metaspace::MetaspaceArena* _non_class_space_arena;
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// Arena for allocations from class space
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// (NULL if -XX:-UseCompressedClassPointers).
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metaspace::MetaspaceArena* _class_space_arena;
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Mutex* lock() const { return _lock; }
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metaspace::MetaspaceArena* non_class_space_arena() const { return _non_class_space_arena; }
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metaspace::MetaspaceArena* class_space_arena() const { return _class_space_arena; }
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public:
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ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType space_type);
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~ClassLoaderMetaspace();
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Metaspace::MetaspaceType space_type() const { return _space_type; }
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// Allocate word_size words from Metaspace.
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MetaWord* allocate(size_t word_size, Metaspace::MetadataType mdType);
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// Attempt to expand the GC threshold to be good for at least another word_size words
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// and allocate. Returns NULL if failure. Used during Metaspace GC.
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MetaWord* expand_and_allocate(size_t word_size, Metaspace::MetadataType mdType);
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// Prematurely returns a metaspace allocation to the _block_freelists
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// because it is not needed anymore.
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void deallocate(MetaWord* ptr, size_t word_size, bool is_class);
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// Update statistics. This walks all in-use chunks.
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void add_to_statistics(metaspace::ClmsStats* out) const;
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DEBUG_ONLY(void verify() const;)
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// This only exists for JFR and jcmd VM.classloader_stats. We may want to
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// change this. Capacity as a stat is of questionable use since it may
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// contain committed and uncommitted areas. For now we do this to maintain
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// backward compatibility with JFR.
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void calculate_jfr_stats(size_t* p_used_bytes, size_t* p_capacity_bytes) const;
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}; // end: ClassLoaderMetaspace
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#endif // SHARE_MEMORY_CLASSLOADERMETASPACE_HPP
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