author | stuefe |
Sun, 10 Feb 2019 09:10:42 +0100 | |
changeset 53970 | 1ad7c590a6e7 |
parent 53244 | 9807daeb47c4 |
child 54437 | 2ae93028bef3 |
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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* 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_METASPACE_VIRTUALSPACENODE_HPP |
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#define SHARE_MEMORY_METASPACE_VIRTUALSPACENODE_HPP |
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#include "memory/virtualspace.hpp" |
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#include "memory/memRegion.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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class Metachunk; |
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class ChunkManager; |
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class OccupancyMap; |
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// A VirtualSpaceList node. |
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class VirtualSpaceNode : public CHeapObj<mtClass> { |
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friend class VirtualSpaceList; |
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// Link to next VirtualSpaceNode |
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VirtualSpaceNode* _next; |
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// Whether this node is contained in class or metaspace. |
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const bool _is_class; |
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// total in the VirtualSpace |
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ReservedSpace _rs; |
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VirtualSpace _virtual_space; |
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MetaWord* _top; |
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// count of chunks contained in this VirtualSpace |
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uintx _container_count; |
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OccupancyMap* _occupancy_map; |
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// Convenience functions to access the _virtual_space |
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char* low() const { return virtual_space()->low(); } |
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char* high() const { return virtual_space()->high(); } |
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// The first Metachunk will be allocated at the bottom of the |
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// VirtualSpace |
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Metachunk* first_chunk() { return (Metachunk*) bottom(); } |
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// Committed but unused space in the virtual space |
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size_t free_words_in_vs() const; |
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// True if this node belongs to class metaspace. |
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bool is_class() const { return _is_class; } |
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// Helper function for take_from_committed: allocate padding chunks |
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// until top is at the given address. |
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void allocate_padding_chunks_until_top_is_at(MetaWord* target_top); |
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public: |
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VirtualSpaceNode(bool is_class, size_t byte_size); |
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VirtualSpaceNode(bool is_class, ReservedSpace rs) : |
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_next(NULL), _is_class(is_class), _rs(rs), _top(NULL), _container_count(0), _occupancy_map(NULL) {} |
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~VirtualSpaceNode(); |
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// Convenience functions for logical bottom and end |
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MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
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MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
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const OccupancyMap* occupancy_map() const { return _occupancy_map; } |
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OccupancyMap* occupancy_map() { return _occupancy_map; } |
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bool contains(const void* ptr) { return ptr >= low() && ptr < high(); } |
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size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; } |
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size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; } |
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bool is_pre_committed() const { return _virtual_space.special(); } |
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// address of next available space in _virtual_space; |
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// Accessors |
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VirtualSpaceNode* next() { return _next; } |
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void set_next(VirtualSpaceNode* v) { _next = v; } |
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void set_top(MetaWord* v) { _top = v; } |
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// Accessors |
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VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
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// Returns true if "word_size" is available in the VirtualSpace |
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bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); } |
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MetaWord* top() const { return _top; } |
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void inc_top(size_t word_size) { _top += word_size; } |
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uintx container_count() { return _container_count; } |
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void inc_container_count(); |
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void dec_container_count(); |
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// used and capacity in this single entry in the list |
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size_t used_words_in_vs() const; |
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size_t capacity_words_in_vs() const; |
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bool initialize(); |
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// get space from the virtual space |
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Metachunk* take_from_committed(size_t chunk_word_size); |
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// Allocate a chunk from the virtual space and return it. |
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Metachunk* get_chunk_vs(size_t chunk_word_size); |
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// Expands the committed space by at least min_words words. |
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bool expand_by(size_t min_words, size_t preferred_words); |
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// In preparation for deleting this node, remove all the chunks |
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// in the node from any freelist. |
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void purge(ChunkManager* chunk_manager); |
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// If an allocation doesn't fit in the current node a new node is created. |
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// Allocate chunks out of the remaining committed space in this node |
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// to avoid wasting that memory. |
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// This always adds up because all the chunk sizes are multiples of |
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// the smallest chunk size. |
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void retire(ChunkManager* chunk_manager); |
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void print_on(outputStream* st) const { print_on(st, K); } |
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void print_on(outputStream* st, size_t scale) const; |
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void print_map(outputStream* st, bool is_class) const; |
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// Debug support |
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DEBUG_ONLY(void mangle();) |
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// Verify counters and basic structure. Slow mode: verify all chunks in depth and occupancy map. |
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DEBUG_ONLY(void verify(bool slow);) |
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// Verify that all free chunks in this node are ideally merged |
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// (there should not be multiple small chunks where a large chunk could exist.) |
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DEBUG_ONLY(void verify_free_chunks_are_ideally_merged();) |
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}; |
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} // namespace metaspace |
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#endif // SHARE_MEMORY_METASPACE_VIRTUALSPACENODE_HPP |