author | jmasa |
Wed, 25 Apr 2012 09:55:55 -0700 | |
changeset 12509 | 6228e2085074 |
parent 12507 | 6182ca66bc7b |
child 12933 | 0b79a2cea769 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2012, 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_VM_MEMORY_BINARYTREEDICTIONARY_HPP |
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#define SHARE_VM_MEMORY_BINARYTREEDICTIONARY_HPP |
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#include "memory/freeBlockDictionary.hpp" |
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#include "memory/freeList.hpp" |
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/* |
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* A binary tree based search structure for free blocks. |
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* This is currently used in the Concurrent Mark&Sweep implementation, but |
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* will be used for free block management for metadata. |
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*/ |
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// A TreeList is a FreeList which can be used to maintain a |
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// binary tree of free lists. |
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template <class Chunk> class TreeChunk; |
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template <class Chunk> class BinaryTreeDictionary; |
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template <class Chunk> class AscendTreeCensusClosure; |
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template <class Chunk> class DescendTreeCensusClosure; |
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template <class Chunk> class DescendTreeSearchClosure; |
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template <class Chunk> |
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class TreeList: public FreeList<Chunk> { |
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friend class TreeChunk<Chunk>; |
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friend class BinaryTreeDictionary<Chunk>; |
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friend class AscendTreeCensusClosure<Chunk>; |
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friend class DescendTreeCensusClosure<Chunk>; |
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friend class DescendTreeSearchClosure<Chunk>; |
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TreeList<Chunk>* _parent; |
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TreeList<Chunk>* _left; |
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TreeList<Chunk>* _right; |
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protected: |
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TreeList<Chunk>* parent() const { return _parent; } |
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TreeList<Chunk>* left() const { return _left; } |
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TreeList<Chunk>* right() const { return _right; } |
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// Wrapper on call to base class, to get the template to compile. |
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Chunk* head() const { return FreeList<Chunk>::head(); } |
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Chunk* tail() const { return FreeList<Chunk>::tail(); } |
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void set_head(Chunk* head) { FreeList<Chunk>::set_head(head); } |
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void set_tail(Chunk* tail) { FreeList<Chunk>::set_tail(tail); } |
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size_t size() const { return FreeList<Chunk>::size(); } |
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// Accessors for links in tree. |
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void set_left(TreeList<Chunk>* tl) { |
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_left = tl; |
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if (tl != NULL) |
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tl->set_parent(this); |
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} |
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void set_right(TreeList<Chunk>* tl) { |
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_right = tl; |
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if (tl != NULL) |
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tl->set_parent(this); |
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} |
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void set_parent(TreeList<Chunk>* tl) { _parent = tl; } |
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void clearLeft() { _left = NULL; } |
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void clear_right() { _right = NULL; } |
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void clear_parent() { _parent = NULL; } |
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void initialize() { clearLeft(); clear_right(), clear_parent(); } |
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// For constructing a TreeList from a Tree chunk or |
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// address and size. |
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static TreeList<Chunk>* as_TreeList(TreeChunk<Chunk>* tc); |
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static TreeList<Chunk>* as_TreeList(HeapWord* addr, size_t size); |
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// Returns the head of the free list as a pointer to a TreeChunk. |
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TreeChunk<Chunk>* head_as_TreeChunk(); |
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// Returns the first available chunk in the free list as a pointer |
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// to a TreeChunk. |
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TreeChunk<Chunk>* first_available(); |
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// Returns the block with the largest heap address amongst |
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// those in the list for this size; potentially slow and expensive, |
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// use with caution! |
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TreeChunk<Chunk>* largest_address(); |
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// remove_chunk_replace_if_needed() removes the given "tc" from the TreeList. |
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// If "tc" is the first chunk in the list, it is also the |
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// TreeList that is the node in the tree. remove_chunk_replace_if_needed() |
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// returns the possibly replaced TreeList* for the node in |
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// the tree. It also updates the parent of the original |
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// node to point to the new node. |
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TreeList<Chunk>* remove_chunk_replace_if_needed(TreeChunk<Chunk>* tc); |
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// See FreeList. |
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void return_chunk_at_head(TreeChunk<Chunk>* tc); |
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void return_chunk_at_tail(TreeChunk<Chunk>* tc); |
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}; |
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// A TreeChunk is a subclass of a Chunk that additionally |
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// maintains a pointer to the free list on which it is currently |
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// linked. |
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// A TreeChunk is also used as a node in the binary tree. This |
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// allows the binary tree to be maintained without any additional |
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// storage (the free chunks are used). In a binary tree the first |
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// chunk in the free list is also the tree node. Note that the |
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// TreeChunk has an embedded TreeList for this purpose. Because |
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// the first chunk in the list is distinguished in this fashion |
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// (also is the node in the tree), it is the last chunk to be found |
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// on the free list for a node in the tree and is only removed if |
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// it is the last chunk on the free list. |
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template <class Chunk> |
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class TreeChunk : public Chunk { |
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friend class TreeList<Chunk>; |
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TreeList<Chunk>* _list; |
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TreeList<Chunk> _embedded_list; // if non-null, this chunk is on _list |
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protected: |
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TreeList<Chunk>* embedded_list() const { return (TreeList<Chunk>*) &_embedded_list; } |
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void set_embedded_list(TreeList<Chunk>* v) { _embedded_list = *v; } |
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public: |
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TreeList<Chunk>* list() { return _list; } |
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void set_list(TreeList<Chunk>* v) { _list = v; } |
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static TreeChunk<Chunk>* as_TreeChunk(Chunk* fc); |
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// Initialize fields in a TreeChunk that should be |
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// initialized when the TreeChunk is being added to |
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// a free list in the tree. |
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void initialize() { embedded_list()->initialize(); } |
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Chunk* next() const { return Chunk::next(); } |
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Chunk* prev() const { return Chunk::prev(); } |
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size_t size() const volatile { return Chunk::size(); } |
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// debugging |
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void verify_tree_chunk_list() const; |
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}; |
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template <class Chunk> |
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class BinaryTreeDictionary: public FreeBlockDictionary<Chunk> { |
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friend class VMStructs; |
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bool _splay; |
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size_t _total_size; |
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size_t _total_free_blocks; |
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TreeList<Chunk>* _root; |
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bool _adaptive_freelists; |
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// private accessors |
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bool splay() const { return _splay; } |
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void set_splay(bool v) { _splay = v; } |
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void set_total_size(size_t v) { _total_size = v; } |
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virtual void inc_total_size(size_t v); |
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virtual void dec_total_size(size_t v); |
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size_t total_free_blocks() const { return _total_free_blocks; } |
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void set_total_free_blocks(size_t v) { _total_free_blocks = v; } |
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TreeList<Chunk>* root() const { return _root; } |
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void set_root(TreeList<Chunk>* v) { _root = v; } |
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bool adaptive_freelists() { return _adaptive_freelists; } |
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// This field is added and can be set to point to the |
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// the Mutex used to synchronize access to the |
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// dictionary so that assertion checking can be done. |
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// For example it is set to point to _parDictionaryAllocLock. |
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NOT_PRODUCT(Mutex* _lock;) |
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// Remove a chunk of size "size" or larger from the tree and |
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// return it. If the chunk |
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// is the last chunk of that size, remove the node for that size |
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// from the tree. |
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TreeChunk<Chunk>* get_chunk_from_tree(size_t size, enum FreeBlockDictionary<Chunk>::Dither dither, bool splay); |
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// Return a list of the specified size or NULL from the tree. |
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// The list is not removed from the tree. |
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TreeList<Chunk>* find_list (size_t size) const; |
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// Remove this chunk from the tree. If the removal results |
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// in an empty list in the tree, remove the empty list. |
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TreeChunk<Chunk>* remove_chunk_from_tree(TreeChunk<Chunk>* tc); |
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// Remove the node in the trees starting at tl that has the |
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// minimum value and return it. Repair the tree as needed. |
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TreeList<Chunk>* remove_tree_minimum(TreeList<Chunk>* tl); |
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void semi_splay_step(TreeList<Chunk>* tl); |
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// Add this free chunk to the tree. |
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void insert_chunk_in_tree(Chunk* freeChunk); |
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public: |
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static const size_t min_tree_chunk_size = sizeof(TreeChunk<Chunk>)/HeapWordSize; |
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void verify_tree() const; |
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// verify that the given chunk is in the tree. |
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bool verify_chunk_in_free_list(Chunk* tc) const; |
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private: |
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void verify_tree_helper(TreeList<Chunk>* tl) const; |
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static size_t verify_prev_free_ptrs(TreeList<Chunk>* tl); |
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// Returns the total number of chunks in the list. |
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size_t total_list_length(TreeList<Chunk>* tl) const; |
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// Returns the total number of words in the chunks in the tree |
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// starting at "tl". |
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size_t total_size_in_tree(TreeList<Chunk>* tl) const; |
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// Returns the sum of the square of the size of each block |
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// in the tree starting at "tl". |
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double sum_of_squared_block_sizes(TreeList<Chunk>* const tl) const; |
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// Returns the total number of free blocks in the tree starting |
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// at "tl". |
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size_t total_free_blocks_in_tree(TreeList<Chunk>* tl) const; |
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size_t num_free_blocks() const; |
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size_t treeHeight() const; |
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size_t tree_height_helper(TreeList<Chunk>* tl) const; |
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size_t total_nodes_in_tree(TreeList<Chunk>* tl) const; |
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size_t total_nodes_helper(TreeList<Chunk>* tl) const; |
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public: |
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// Constructor |
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BinaryTreeDictionary(bool adaptive_freelists, bool splay = false); |
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BinaryTreeDictionary(MemRegion mr, bool adaptive_freelists, bool splay = false); |
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// Public accessors |
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size_t total_size() const { return _total_size; } |
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// Reset the dictionary to the initial conditions with |
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// a single free chunk. |
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void reset(MemRegion mr); |
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void reset(HeapWord* addr, size_t size); |
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// Reset the dictionary to be empty. |
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void reset(); |
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// Return a chunk of size "size" or greater from |
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// the tree. |
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// want a better dynamic splay strategy for the future. |
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Chunk* get_chunk(size_t size, enum FreeBlockDictionary<Chunk>::Dither dither) { |
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FreeBlockDictionary<Chunk>::verify_par_locked(); |
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Chunk* res = get_chunk_from_tree(size, dither, splay()); |
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assert(res == NULL || res->is_free(), |
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"Should be returning a free chunk"); |
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return res; |
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} |
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void return_chunk(Chunk* chunk) { |
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FreeBlockDictionary<Chunk>::verify_par_locked(); |
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insert_chunk_in_tree(chunk); |
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} |
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void remove_chunk(Chunk* chunk) { |
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FreeBlockDictionary<Chunk>::verify_par_locked(); |
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remove_chunk_from_tree((TreeChunk<Chunk>*)chunk); |
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assert(chunk->is_free(), "Should still be a free chunk"); |
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} |
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size_t max_chunk_size() const; |
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size_t total_chunk_size(debug_only(const Mutex* lock)) const { |
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debug_only( |
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if (lock != NULL && lock->owned_by_self()) { |
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assert(total_size_in_tree(root()) == total_size(), |
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"_total_size inconsistency"); |
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} |
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) |
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return total_size(); |
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} |
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size_t min_size() const { |
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return min_tree_chunk_size; |
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} |
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double sum_of_squared_block_sizes() const { |
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return sum_of_squared_block_sizes(root()); |
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} |
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Chunk* find_chunk_ends_at(HeapWord* target) const; |
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// Find the list with size "size" in the binary tree and update |
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// the statistics in the list according to "split" (chunk was |
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// split or coalesce) and "birth" (chunk was added or removed). |
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void dict_census_udpate(size_t size, bool split, bool birth); |
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// Return true if the dictionary is overpopulated (more chunks of |
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// this size than desired) for size "size". |
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bool coal_dict_over_populated(size_t size); |
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// Methods called at the beginning of a sweep to prepare the |
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// statistics for the sweep. |
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void begin_sweep_dict_census(double coalSurplusPercent, |
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float inter_sweep_current, |
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float inter_sweep_estimate, |
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float intra_sweep_estimate); |
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// Methods called after the end of a sweep to modify the |
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// statistics for the sweep. |
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void end_sweep_dict_census(double splitSurplusPercent); |
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// Return the largest free chunk in the tree. |
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Chunk* find_largest_dict() const; |
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// Accessors for statistics |
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void set_tree_surplus(double splitSurplusPercent); |
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void set_tree_hints(void); |
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// Reset statistics for all the lists in the tree. |
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void clear_tree_census(void); |
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// Print the statistcis for all the lists in the tree. Also may |
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// print out summaries. |
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void print_dict_census(void) const; |
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void print_free_lists(outputStream* st) const; |
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// For debugging. Returns the sum of the _returned_bytes for |
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// all lists in the tree. |
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size_t sum_dict_returned_bytes() PRODUCT_RETURN0; |
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// Sets the _returned_bytes for all the lists in the tree to zero. |
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void initialize_dict_returned_bytes() PRODUCT_RETURN; |
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// For debugging. Return the total number of chunks in the dictionary. |
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size_t total_count() PRODUCT_RETURN0; |
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void report_statistics() const; |
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void verify() const; |
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}; |
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#endif // SHARE_VM_MEMORY_BINARYTREEDICTIONARY_HPP |