author | stefank |
Tue, 26 Nov 2019 10:47:46 +0100 | |
changeset 59290 | 97d13893ec3c |
parent 55510 | 3e31a8beaae4 |
child 59292 | 95b1385dd476 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2018, 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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#include "precompiled.hpp" |
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#include "gc/g1/g1CardTable.hpp" |
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#include "gc/g1/g1CollectedHeap.inline.hpp" |
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#include "gc/shared/memset_with_concurrent_readers.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/atomic.hpp" |
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void G1CardTable::g1_mark_as_young(const MemRegion& mr) { |
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CardValue *const first = byte_for(mr.start()); |
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CardValue *const last = byte_after(mr.last()); |
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memset_with_concurrent_readers(first, g1_young_gen, last - first); |
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} |
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#ifndef PRODUCT |
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void G1CardTable::verify_g1_young_region(MemRegion mr) { |
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verify_region(mr, g1_young_gen, true); |
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} |
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#endif |
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void G1CardTableChangedListener::on_commit(uint start_idx, size_t num_regions, bool zero_filled) { |
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// Default value for a clean card on the card table is -1. So we cannot take advantage of the zero_filled parameter. |
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MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords); |
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_card_table->clear(mr); |
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} |
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void G1CardTable::initialize(G1RegionToSpaceMapper* mapper) { |
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mapper->set_mapping_changed_listener(&_listener); |
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_byte_map_size = mapper->reserved().byte_size(); |
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_guard_index = cards_required(_whole_heap.word_size()) - 1; |
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_last_valid_index = _guard_index - 1; |
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HeapWord* low_bound = _whole_heap.start(); |
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HeapWord* high_bound = _whole_heap.end(); |
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_cur_covered_regions = 1; |
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_covered[0] = _whole_heap; |
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_byte_map = (CardValue*) mapper->reserved().start(); |
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_byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); |
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assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map"); |
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assert(byte_for(high_bound-1) <= &_byte_map[_last_valid_index], "Checking end of map"); |
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log_trace(gc, barrier)("G1CardTable::G1CardTable: "); |
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log_trace(gc, barrier)(" &_byte_map[0]: " INTPTR_FORMAT " &_byte_map[_last_valid_index]: " INTPTR_FORMAT, |
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p2i(&_byte_map[0]), p2i(&_byte_map[_last_valid_index])); |
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log_trace(gc, barrier)(" _byte_map_base: " INTPTR_FORMAT, p2i(_byte_map_base)); |
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} |
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bool G1CardTable::is_in_young(oop obj) const { |
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volatile CardValue* p = byte_for(obj); |
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return *p == G1CardTable::g1_young_card_val(); |
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} |