author | tschatzl |
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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_G1COLLECTIONSETCANDIDATES_HPP |
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#define SHARE_GC_G1_G1COLLECTIONSETCANDIDATES_HPP |
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#include "gc/g1/g1CollectionSetCandidates.hpp" |
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#include "gc/shared/workgroup.hpp" |
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#include "memory/allocation.hpp" |
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#include "runtime/globals.hpp" |
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class HeapRegion; |
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class HeapRegionClosure; |
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// Set of collection set candidates, i.e. all old gen regions we consider worth |
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// collecting in the remainder of the current mixed phase. Regions are sorted by decreasing |
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// gc efficiency. |
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// Maintains a cursor into the list that specifies the next collection set candidate |
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// to put into the current collection set. |
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class G1CollectionSetCandidates : public CHeapObj<mtGC> { |
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HeapRegion** _regions; |
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uint _num_regions; // Total number of regions in the collection set candidate set. |
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// The sum of bytes that can be reclaimed in the remaining set of collection |
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// set candidates. |
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size_t _remaining_reclaimable_bytes; |
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// The index of the next candidate old region to be considered for |
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// addition to the current collection set. |
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uint _front_idx; |
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public: |
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G1CollectionSetCandidates(HeapRegion** regions, uint num_regions, size_t remaining_reclaimable_bytes) : |
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_regions(regions), |
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_num_regions(num_regions), |
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_remaining_reclaimable_bytes(remaining_reclaimable_bytes), |
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_front_idx(0) { } |
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~G1CollectionSetCandidates() { |
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FREE_C_HEAP_ARRAY(HeapRegion*, _regions); |
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} |
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// Returns the total number of collection set candidate old regions added. |
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uint num_regions() { return _num_regions; } |
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uint cur_idx() const { return _front_idx; } |
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HeapRegion* at(uint idx) const { |
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HeapRegion* res = NULL; |
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if (idx < _num_regions) { |
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res = _regions[idx]; |
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assert(res != NULL, "Unexpected NULL HeapRegion at index %u", idx); |
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} |
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return res; |
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} |
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void remove(uint num_regions); |
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// Iterate over all remaining collection set candidate regions. |
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void iterate(HeapRegionClosure* cl); |
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// Return the number of candidate regions remaining. |
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uint num_remaining() { return _num_regions - _front_idx; } |
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bool is_empty() { return num_remaining() == 0; } |
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// Return the amount of reclaimable bytes that may be collected by the remaining |
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// candidate regions. |
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size_t remaining_reclaimable_bytes() { return _remaining_reclaimable_bytes; } |
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void verify() const PRODUCT_RETURN; |
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}; |
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#endif /* SHARE_GC_G1_G1COLLECTIONSETCANDIDATES_HPP */ |
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