author | stefank |
Thu, 09 May 2019 14:28:30 +0200 | |
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/* |
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* Copyright (c) 2001, 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_BINARYTREEDICTIONARY_HPP |
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#define SHARE_MEMORY_BINARYTREEDICTIONARY_HPP |
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#include "memory/freeList.hpp" |
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#include "memory/memRegion.hpp" |
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class Mutex; |
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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_t, class FreeList_t> class TreeChunk; |
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template <class Chunk_t, class FreeList_t> class BinaryTreeDictionary; |
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template <class Chunk_t, class FreeList_t> class AscendTreeCensusClosure; |
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template <class Chunk_t, class FreeList_t> class DescendTreeCensusClosure; |
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template <class Chunk_t, class FreeList_t> class DescendTreeSearchClosure; |
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template <class Chunk_t, class FreeList_t> |
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class TreeList : public FreeList_t { |
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friend class TreeChunk<Chunk_t, FreeList_t>; |
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friend class BinaryTreeDictionary<Chunk_t, FreeList_t>; |
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friend class AscendTreeCensusClosure<Chunk_t, FreeList_t>; |
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friend class DescendTreeCensusClosure<Chunk_t, FreeList_t>; |
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friend class DescendTreeSearchClosure<Chunk_t, FreeList_t>; |
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TreeList<Chunk_t, FreeList_t>* _parent; |
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TreeList<Chunk_t, FreeList_t>* _left; |
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TreeList<Chunk_t, FreeList_t>* _right; |
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protected: |
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TreeList<Chunk_t, FreeList_t>* parent() const { return _parent; } |
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TreeList<Chunk_t, FreeList_t>* left() const { return _left; } |
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TreeList<Chunk_t, FreeList_t>* 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_t* head() const { return FreeList_t::head(); } |
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Chunk_t* tail() const { return FreeList_t::tail(); } |
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void set_head(Chunk_t* head) { FreeList_t::set_head(head); } |
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void set_tail(Chunk_t* tail) { FreeList_t::set_tail(tail); } |
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size_t size() const { return FreeList_t::size(); } |
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// Accessors for links in tree. |
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void set_left(TreeList<Chunk_t, FreeList_t>* 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_t, FreeList_t>* 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_t, FreeList_t>* tl) { _parent = tl; } |
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void clear_left() { _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() { clear_left(); clear_right(), clear_parent(); FreeList_t::initialize(); } |
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// For constructing a TreeList from a Tree chunk or |
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// address and size. |
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TreeList(); |
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static TreeList<Chunk_t, FreeList_t>* |
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as_TreeList(TreeChunk<Chunk_t, FreeList_t>* tc); |
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static TreeList<Chunk_t, FreeList_t>* 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_t, FreeList_t>* 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_t, FreeList_t>* 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_t, FreeList_t>* largest_address(); |
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TreeList<Chunk_t, FreeList_t>* get_better_list( |
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BinaryTreeDictionary<Chunk_t, FreeList_t>* dictionary); |
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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_t, FreeList_t>* remove_chunk_replace_if_needed(TreeChunk<Chunk_t, FreeList_t>* tc); |
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// See FreeList. |
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void return_chunk_at_tail(TreeChunk<Chunk_t, FreeList_t>* 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_t, class FreeList_t> |
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class TreeChunk : public Chunk_t { |
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friend class TreeList<Chunk_t, FreeList_t>; |
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TreeList<Chunk_t, FreeList_t>* _list; |
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TreeList<Chunk_t, FreeList_t> _embedded_list; // if non-null, this chunk is on _list |
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static size_t _min_tree_chunk_size; |
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protected: |
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TreeList<Chunk_t, FreeList_t>* embedded_list() const { return (TreeList<Chunk_t, FreeList_t>*) &_embedded_list; } |
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void set_embedded_list(TreeList<Chunk_t, FreeList_t>* v) { _embedded_list = *v; } |
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public: |
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TreeList<Chunk_t, FreeList_t>* list() { return _list; } |
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void set_list(TreeList<Chunk_t, FreeList_t>* v) { _list = v; } |
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static TreeChunk<Chunk_t, FreeList_t>* as_TreeChunk(Chunk_t* 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_t* next() const { return Chunk_t::next(); } |
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Chunk_t* prev() const { return Chunk_t::prev(); } |
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size_t size() const volatile { return Chunk_t::size(); } |
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static size_t min_size(); |
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// debugging |
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void verify_tree_chunk_list() const; |
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void assert_is_mangled() const; |
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}; |
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template <class Chunk_t, class FreeList_t> |
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size_t TreeChunk<Chunk_t, FreeList_t>::_min_tree_chunk_size = sizeof(TreeChunk<Chunk_t, FreeList_t>)/HeapWordSize; |
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template <class Chunk_t, class FreeList_t> |
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size_t TreeChunk<Chunk_t, FreeList_t>::min_size() { return _min_tree_chunk_size; } |
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template <class Chunk_t, class FreeList_t> |
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class BinaryTreeDictionary: public CHeapObj<mtGC> { |
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friend class VMStructs; |
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protected: |
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size_t _total_size; |
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size_t _total_free_blocks; |
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TreeList<Chunk_t, FreeList_t>* _root; |
1 | 183 |
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// private accessors |
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void set_total_size(size_t v) { _total_size = v; } |
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void inc_total_size(size_t v); |
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void dec_total_size(size_t v); |
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void set_total_free_blocks(size_t v) { _total_free_blocks = v; } |
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TreeList<Chunk_t, FreeList_t>* root() const { return _root; } |
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void set_root(TreeList<Chunk_t, FreeList_t>* v) { _root = v; } |
12507 | 191 |
|
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// This field is added and can be set to point to the |
|
193 |
// the Mutex used to synchronize access to the |
|
194 |
// 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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1 | 197 |
|
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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_t, FreeList_t>* get_chunk_from_tree(size_t size); |
1 | 203 |
// Remove this chunk from the tree. If the removal results |
204 |
// in an empty list in the tree, remove the empty list. |
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TreeChunk<Chunk_t, FreeList_t>* remove_chunk_from_tree(TreeChunk<Chunk_t, FreeList_t>* tc); |
1 | 206 |
// Remove the node in the trees starting at tl that has the |
207 |
// minimum value and return it. Repair the tree as needed. |
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TreeList<Chunk_t, FreeList_t>* remove_tree_minimum(TreeList<Chunk_t, FreeList_t>* tl); |
1 | 209 |
// Add this free chunk to the tree. |
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void insert_chunk_in_tree(Chunk_t* freeChunk); |
1 | 211 |
public: |
12507 | 212 |
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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_t, FreeList_t>* find_list (size_t size) const; |
12507 | 216 |
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void verify_tree() const; |
1 | 218 |
// verify that the given chunk is in the tree. |
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bool verify_chunk_in_free_list(Chunk_t* tc) const; |
1 | 220 |
private: |
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void verify_tree_helper(TreeList<Chunk_t, FreeList_t>* tl) const; |
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static size_t verify_prev_free_ptrs(TreeList<Chunk_t, FreeList_t>* tl); |
1 | 223 |
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// Returns the total number of chunks in the list. |
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size_t total_list_length(TreeList<Chunk_t, FreeList_t>* tl) const; |
1 | 226 |
// Returns the total number of words in the chunks in the tree |
227 |
// starting at "tl". |
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size_t total_size_in_tree(TreeList<Chunk_t, FreeList_t>* tl) const; |
1 | 229 |
// Returns the sum of the square of the size of each block |
230 |
// in the tree starting at "tl". |
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double sum_of_squared_block_sizes(TreeList<Chunk_t, FreeList_t>* const tl) const; |
1 | 232 |
// Returns the total number of free blocks in the tree starting |
233 |
// at "tl". |
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size_t total_free_blocks_in_tree(TreeList<Chunk_t, FreeList_t>* tl) const; |
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size_t num_free_blocks() const; |
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size_t tree_height() const; |
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size_t tree_height_helper(TreeList<Chunk_t, FreeList_t>* tl) const; |
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size_t total_nodes_helper(TreeList<Chunk_t, FreeList_t>* tl) const; |
1 | 239 |
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public: |
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241 |
// Constructor |
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BinaryTreeDictionary() : |
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_total_size(0), _total_free_blocks(0), _root(0) {} |
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244 |
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BinaryTreeDictionary(MemRegion mr); |
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|
247 |
// Public accessors |
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size_t total_size() const { return _total_size; } |
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size_t total_free_blocks() const { return _total_free_blocks; } |
1 | 250 |
|
251 |
// Reset the dictionary to the initial conditions with |
|
252 |
// a single free chunk. |
|
253 |
void reset(MemRegion mr); |
|
254 |
void reset(HeapWord* addr, size_t size); |
|
255 |
// Reset the dictionary to be empty. |
|
256 |
void reset(); |
|
257 |
||
258 |
// Return a chunk of size "size" or greater from |
|
259 |
// the tree. |
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Chunk_t* get_chunk(size_t size) { |
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verify_par_locked(); |
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Chunk_t* res = get_chunk_from_tree(size); |
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assert(res == NULL || res->is_free(), |
1 | 264 |
"Should be returning a free chunk"); |
265 |
return res; |
|
266 |
} |
|
267 |
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void return_chunk(Chunk_t* chunk) { |
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verify_par_locked(); |
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insert_chunk_in_tree(chunk); |
1 | 271 |
} |
272 |
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void remove_chunk(Chunk_t* chunk) { |
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verify_par_locked(); |
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remove_chunk_from_tree((TreeChunk<Chunk_t, FreeList_t>*)chunk); |
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assert(chunk->is_free(), "Should still be a free chunk"); |
1 | 277 |
} |
278 |
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size_t max_chunk_size() const; |
50193 | 280 |
inline size_t total_chunk_size(debug_only(const Mutex* lock)) const; |
1 | 281 |
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size_t min_size() const { |
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return TreeChunk<Chunk_t, FreeList_t>::min_size(); |
1 | 284 |
} |
285 |
||
286 |
double sum_of_squared_block_sizes() const { |
|
287 |
return sum_of_squared_block_sizes(root()); |
|
288 |
} |
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289 |
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Chunk_t* find_chunk_ends_at(HeapWord* target) const; |
1 | 291 |
|
292 |
// Return the largest free chunk in the tree. |
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Chunk_t* find_largest_dict() const; |
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294 |
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void print_free_lists(outputStream* st) const; |
1 | 296 |
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// For debugging. Returns the sum of the _returned_bytes for |
1 | 298 |
// 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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301 |
void initialize_dict_returned_bytes() PRODUCT_RETURN; |
1 | 302 |
// For debugging. Return the total number of chunks in the dictionary. |
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size_t total_count() PRODUCT_RETURN0; |
1 | 304 |
|
35061 | 305 |
void report_statistics(outputStream* st) const; |
1 | 306 |
|
307 |
void verify() const; |
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308 |
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Mutex* par_lock() const PRODUCT_RETURN0; |
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void set_par_lock(Mutex* lock) PRODUCT_RETURN; |
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void verify_par_locked() const PRODUCT_RETURN; |
1 | 312 |
}; |
7397 | 313 |
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314 |
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// Closures for walking the binary tree. |
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316 |
// do_list() walks the free list in a node applying the closure |
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// to each free chunk in the list |
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// do_tree() walks the nodes in the binary tree applying do_list() |
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// to each list at each node. |
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320 |
|
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template <class Chunk_t, class FreeList_t> |
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class TreeCensusClosure : public StackObj { |
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protected: |
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virtual void do_list(FreeList_t* fl) = 0; |
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public: |
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virtual void do_tree(TreeList<Chunk_t, FreeList_t>* tl) = 0; |
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}; |
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328 |
|
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template <class Chunk_t, class FreeList_t> |
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class AscendTreeCensusClosure : public TreeCensusClosure<Chunk_t, FreeList_t> { |
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public: |
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332 |
void do_tree(TreeList<Chunk_t, FreeList_t>* tl) { |
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333 |
if (tl != NULL) { |
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334 |
do_tree(tl->left()); |
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this->do_list(tl); |
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do_tree(tl->right()); |
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} |
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338 |
} |
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339 |
}; |
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340 |
|
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template <class Chunk_t, class FreeList_t> |
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class DescendTreeCensusClosure : public TreeCensusClosure<Chunk_t, FreeList_t> { |
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public: |
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void do_tree(TreeList<Chunk_t, FreeList_t>* tl) { |
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if (tl != NULL) { |
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do_tree(tl->right()); |
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this->do_list(tl); |
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do_tree(tl->left()); |
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} |
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} |
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}; |
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|
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// Used to search the tree until a condition is met. |
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// Similar to TreeCensusClosure but searches the |
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// tree and returns promptly when found. |
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|
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template <class Chunk_t, class FreeList_t> |
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class TreeSearchClosure : public StackObj { |
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protected: |
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virtual bool do_list(FreeList_t* fl) = 0; |
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public: |
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virtual bool do_tree(TreeList<Chunk_t, FreeList_t>* tl) = 0; |
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}; |
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|
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#if 0 // Don't need this yet but here for symmetry. |
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template <class Chunk_t, class FreeList_t> |
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class AscendTreeSearchClosure : public TreeSearchClosure<Chunk_t> { |
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public: |
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bool do_tree(TreeList<Chunk_t, FreeList_t>* tl) { |
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if (tl != NULL) { |
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if (do_tree(tl->left())) return true; |
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if (do_list(tl)) return true; |
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if (do_tree(tl->right())) return true; |
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} |
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return false; |
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} |
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}; |
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#endif |
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|
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template <class Chunk_t, class FreeList_t> |
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class DescendTreeSearchClosure : public TreeSearchClosure<Chunk_t, FreeList_t> { |
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public: |
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bool do_tree(TreeList<Chunk_t, FreeList_t>* tl) { |
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if (tl != NULL) { |
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if (do_tree(tl->right())) return true; |
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if (this->do_list(tl)) return true; |
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if (do_tree(tl->left())) return true; |
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} |
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return false; |
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} |
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}; |
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|
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#endif // SHARE_MEMORY_BINARYTREEDICTIONARY_HPP |