| /* |
| * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_GC_G1_G1REDIRTYCARDSQUEUE_HPP |
| #define SHARE_GC_G1_G1REDIRTYCARDSQUEUE_HPP |
| |
| #include "gc/g1/g1BufferNodeList.hpp" |
| #include "gc/shared/ptrQueue.hpp" |
| #include "memory/padded.hpp" |
| |
| class G1RedirtyCardsQueueSet; |
| |
| // Provide G1RedirtyCardsQueue with a thread-local qset. It provides an |
| // uncontended staging area for completed buffers, to be flushed to the |
| // shared qset en masse. |
| class G1RedirtyCardsLocalQueueSet : public PtrQueueSet { |
| G1RedirtyCardsQueueSet* _shared_qset; |
| G1BufferNodeList _buffers; |
| |
| public: |
| G1RedirtyCardsLocalQueueSet(G1RedirtyCardsQueueSet* shared_qset); |
| ~G1RedirtyCardsLocalQueueSet() NOT_DEBUG(= default); |
| |
| // Add the buffer to the local list. |
| virtual void enqueue_completed_buffer(BufferNode* node); |
| |
| // Transfer all completed buffers to the shared qset. |
| void flush(); |
| }; |
| |
| // Worker-local queues of card table entries. |
| class G1RedirtyCardsQueue : public PtrQueue { |
| protected: |
| virtual void handle_completed_buffer(); |
| |
| public: |
| G1RedirtyCardsQueue(G1RedirtyCardsLocalQueueSet* qset); |
| ~G1RedirtyCardsQueue() NOT_DEBUG(= default); |
| |
| // Flushes all enqueued cards to qset. |
| void flush(); |
| }; |
| |
| // Card table entries to be redirtied and the cards reprocessed later. |
| // Has two phases, collecting and processing. During the collecting |
| // phase buffers are added to the set. Once collecting is complete and |
| // processing starts, buffers can no longer be added. Taking all the |
| // collected (and processed) buffers reverts back to collecting, allowing |
| // the set to be reused for another round of redirtying. |
| class G1RedirtyCardsQueueSet : public PtrQueueSet { |
| DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0); |
| BufferNode::Stack _list; |
| DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(size_t)); |
| volatile size_t _entry_count; |
| DEFINE_PAD_MINUS_SIZE(3, DEFAULT_CACHE_LINE_SIZE, sizeof(BufferNode*)); |
| BufferNode* _tail; |
| DEBUG_ONLY(mutable bool _collecting;) |
| |
| void update_tail(BufferNode* node); |
| |
| public: |
| G1RedirtyCardsQueueSet(BufferNode::Allocator* allocator); |
| ~G1RedirtyCardsQueueSet(); |
| |
| void verify_empty() const NOT_DEBUG_RETURN; |
| |
| // Collect buffers. These functions are thread-safe. |
| // precondition: Must not be concurrent with buffer processing. |
| virtual void enqueue_completed_buffer(BufferNode* node); |
| void add_bufferlist(const G1BufferNodeList& buffers); |
| |
| // Processing phase operations. |
| // precondition: Must not be concurrent with buffer collection. |
| BufferNode* all_completed_buffers() const; |
| G1BufferNodeList take_all_completed_buffers(); |
| }; |
| |
| #endif // SHARE_GC_G1_G1REDIRTYCARDSQUEUE_HPP |