author | kbarrett |
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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_GC_G1_G1DIRTYCARDQUEUE_HPP |
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#define SHARE_GC_G1_G1DIRTYCARDQUEUE_HPP |
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#include "gc/shared/ptrQueue.hpp" |
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#include "memory/allocation.hpp" |
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class G1DirtyCardQueueSet; |
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class G1FreeIdSet; |
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class JavaThread; |
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class Monitor; |
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// A closure class for processing card table entries. Note that we don't |
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// require these closure objects to be stack-allocated. |
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class G1CardTableEntryClosure: public CHeapObj<mtGC> { |
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// Process the card whose card table entry is "card_ptr". If returns |
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// "false", terminate the iteration early. |
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virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i) = 0; |
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}; |
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// A ptrQueue whose elements are "oops", pointers to object heads. |
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class G1DirtyCardQueue: public PtrQueue { |
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public: |
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G1DirtyCardQueue(G1DirtyCardQueueSet* qset, bool permanent = false); |
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// Flush before destroying; queue may be used to capture pending work while |
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// doing something else, with auto-flush on completion. |
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~G1DirtyCardQueue(); |
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// Process queue entries and release resources. |
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void flush() { flush_impl(); } |
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// Compiler support. |
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static ByteSize byte_offset_of_index() { |
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return PtrQueue::byte_offset_of_index<G1DirtyCardQueue>(); |
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} |
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using PtrQueue::byte_width_of_index; |
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static ByteSize byte_offset_of_buf() { |
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return PtrQueue::byte_offset_of_buf<G1DirtyCardQueue>(); |
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} |
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using PtrQueue::byte_width_of_buf; |
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}; |
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class G1DirtyCardQueueSet: public PtrQueueSet { |
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G1DirtyCardQueue _shared_dirty_card_queue; |
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// Apply the closure to the elements of "node" from it's index to |
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// buffer_size. If all closure applications return true, then |
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// returns true. Stops processing after the first closure |
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// application that returns false, and returns false from this |
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// function. If "consume" is true, the node's index is updated to |
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// exclude the processed elements, e.g. up to the element for which |
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// the closure returned false. |
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bool apply_closure_to_buffer(G1CardTableEntryClosure* cl, |
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BufferNode* node, |
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bool consume, |
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uint worker_i = 0); |
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// If there are more than stop_at completed buffers, pop one, apply |
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// the specified closure to its active elements, and return true. |
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// Otherwise return false. |
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// |
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// A completely processed buffer is freed. However, if a closure |
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// invocation returns false, processing is stopped and the partially |
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// processed buffer (with its index updated to exclude the processed |
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// elements, e.g. up to the element for which the closure returned |
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// false) is returned to the completed buffer set. |
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// |
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// If during_pause is true, stop_at must be zero, and the closure |
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// must never return false. |
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bool apply_closure_to_completed_buffer(G1CardTableEntryClosure* cl, |
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uint worker_i, |
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size_t stop_at, |
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bool during_pause); |
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bool mut_process_buffer(BufferNode* node); |
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G1FreeIdSet* _free_ids; |
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// The number of completed buffers processed by mutator and rs thread, |
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// respectively. |
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jint _processed_buffers_mut; |
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jint _processed_buffers_rs_thread; |
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// Current buffer node used for parallel iteration. |
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BufferNode* volatile _cur_par_buffer_node; |
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void concatenate_log(G1DirtyCardQueue& dcq); |
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public: |
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G1DirtyCardQueueSet(bool notify_when_complete = true); |
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~G1DirtyCardQueueSet(); |
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void initialize(Monitor* cbl_mon, |
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BufferNode::Allocator* allocator, |
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Mutex* lock, |
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bool init_free_ids = false); |
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// The number of parallel ids that can be claimed to allow collector or |
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// mutator threads to do card-processing work. |
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static uint num_par_ids(); |
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static void handle_zero_index_for_thread(JavaThread* t); |
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// Apply G1RefineCardConcurrentlyClosure to completed buffers until there are stop_at |
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// completed buffers remaining. |
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bool refine_completed_buffer_concurrently(uint worker_i, size_t stop_at); |
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// Apply the given closure to all completed buffers. The given closure's do_card_ptr |
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// must never return false. Must only be called during GC. |
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bool apply_closure_during_gc(G1CardTableEntryClosure* cl, uint worker_i); |
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void reset_for_par_iteration() { _cur_par_buffer_node = completed_buffers_head(); } |
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// Applies the current closure to all completed buffers, non-consumptively. |
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// Can be used in parallel, all callers using the iteration state initialized |
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// by reset_for_par_iteration. |
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void par_apply_closure_to_all_completed_buffers(G1CardTableEntryClosure* cl); |
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G1DirtyCardQueue* shared_dirty_card_queue() { |
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return &_shared_dirty_card_queue; |
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} |
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// If a full collection is happening, reset partial logs, and ignore |
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// completed ones: the full collection will make them all irrelevant. |
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void abandon_logs(); |
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// If any threads have partial logs, add them to the global list of logs. |
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void concatenate_logs(); |
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jint processed_buffers_mut() { |
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return _processed_buffers_mut; |
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} |
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jint processed_buffers_rs_thread() { |
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return _processed_buffers_rs_thread; |
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} |
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}; |
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#endif // SHARE_GC_G1_G1DIRTYCARDQUEUE_HPP |