author | tschatzl |
Wed, 24 Jul 2019 11:49:39 +0200 | |
changeset 57507 | f6b30bd6804e |
parent 55752 | 8ae33203d600 |
child 57785 | 8d9362f3b8aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 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_GC_G1_G1REDIRTYCARDSQUEUE_HPP |
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#define SHARE_GC_G1_G1REDIRTYCARDSQUEUE_HPP |
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#include "gc/shared/ptrQueue.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/padded.hpp" |
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class G1CardTableEntryClosure; |
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class G1RedirtyCardsQueue; |
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class G1RedirtyCardsQueueSet; |
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|
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struct G1RedirtyCardsBufferList { |
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BufferNode* _head; |
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BufferNode* _tail; |
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size_t _entry_count; |
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|
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G1RedirtyCardsBufferList(); |
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G1RedirtyCardsBufferList(BufferNode* head, BufferNode* tail, size_t entry_count); |
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}; |
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|
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// Provide G1RedirtyCardsQueue with a thread-local qset. It provides an |
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// uncontended staging area for completed buffers, to be flushed to the |
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// shared qset en masse. Using the "base from member" idiom so the local |
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// qset is constructed before being passed to the PtrQueue constructor. |
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class G1RedirtyCardsQueueBase { |
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friend class G1RedirtyCardsQueue; |
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friend class G1RedirtyCardsQueueSet; |
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class LocalQSet : public PtrQueueSet { |
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G1RedirtyCardsQueueSet* _shared_qset; |
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G1RedirtyCardsBufferList _buffers; |
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|
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public: |
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LocalQSet(G1RedirtyCardsQueueSet* shared_qset); |
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~LocalQSet(); |
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|
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// Add the buffer to the local list. |
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virtual void enqueue_completed_buffer(BufferNode* node); |
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// Transfer all completed buffers to the shared qset. |
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void flush(); |
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G1RedirtyCardsBufferList take_all_completed_buffers(); |
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}; |
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G1RedirtyCardsQueueBase(G1RedirtyCardsQueueSet* shared_qset) : |
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_local_qset(shared_qset) {} |
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~G1RedirtyCardsQueueBase() {} |
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LocalQSet _local_qset; |
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}; |
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// Worker-local queues of card table entries. |
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class G1RedirtyCardsQueue : private G1RedirtyCardsQueueBase, public PtrQueue { |
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protected: |
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virtual void handle_completed_buffer(); |
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public: |
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G1RedirtyCardsQueue(G1RedirtyCardsQueueSet* qset); |
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// Flushes the queue. |
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~G1RedirtyCardsQueue(); |
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// Flushes all enqueued cards to qset. |
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void flush(); |
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}; |
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// Card table entries to be redirtied and the cards reprocessed later. |
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// Has two phases, collecting and processing. During the collecting |
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// phase buffers are added to the set. Once collecting is complete and |
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// processing starts, buffers can no longer be added. Taking all the |
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// collected (and processed) buffers reverts back to collecting, allowing |
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// the set to be reused for another round of redirtying. |
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class G1RedirtyCardsQueueSet : public PtrQueueSet { |
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DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0); |
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BufferNode::Stack _list; |
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DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(size_t)); |
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volatile size_t _entry_count; |
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DEFINE_PAD_MINUS_SIZE(3, DEFAULT_CACHE_LINE_SIZE, sizeof(BufferNode*)); |
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BufferNode* _tail; |
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DEBUG_ONLY(mutable bool _collecting;) |
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typedef G1RedirtyCardsQueueBase::LocalQSet LocalQSet; |
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void update_tail(BufferNode* node); |
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public: |
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G1RedirtyCardsQueueSet(); |
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~G1RedirtyCardsQueueSet(); |
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using PtrQueueSet::initialize; |
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void verify_empty() const NOT_DEBUG_RETURN; |
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// Collect buffers. These functions are thread-safe. |
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// precondition: Must not be concurrent with buffer processing. |
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virtual void enqueue_completed_buffer(BufferNode* node); |
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void merge_bufferlist(LocalQSet* src); |
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// Processing phase operations. |
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// precondition: Must not be concurrent with buffer collection. |
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BufferNode* all_completed_buffers() const; |
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G1RedirtyCardsBufferList take_all_completed_buffers(); |
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}; |
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|
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#endif // SHARE_GC_G1_G1REDIRTYCARDSQUEUE_HPP |