136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
/*
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* Copyright (c) 2013, 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_G1CARDCOUNTS_HPP
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#define SHARE_GC_G1_G1CARDCOUNTS_HPP
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#include "gc/g1/g1CardTable.hpp"
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#include "gc/g1/g1RegionToSpaceMapper.hpp"
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#include "memory/allocation.hpp"
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#include "memory/virtualspace.hpp"
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#include "utilities/globalDefinitions.hpp"
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class CardTableBarrierSet;
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class G1CardCounts;
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class G1CollectedHeap;
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class G1RegionToSpaceMapper;
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class HeapRegion;
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class G1CardCountsMappingChangedListener : public G1MappingChangedListener {
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private:
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G1CardCounts* _counts;
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public:
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void set_cardcounts(G1CardCounts* counts) { _counts = counts; }
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virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
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};
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// Table to track the number of times a card has been refined. Once
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// a card has been refined a certain number of times, it is
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// considered 'hot' and its refinement is delayed by inserting the
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// card into the hot card cache. The card will then be refined when
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// it is evicted from the hot card cache, or when the hot card cache
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// is 'drained' during the next evacuation pause.
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class G1CardCounts: public CHeapObj<mtGC> {
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public:
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typedef CardTable::CardValue CardValue;
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private:
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G1CardCountsMappingChangedListener _listener;
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G1CollectedHeap* _g1h;
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G1CardTable* _ct;
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// The table of counts
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uint8_t* _card_counts;
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// Max capacity of the reserved space for the counts table
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size_t _reserved_max_card_num;
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// CardTable bottom.
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const CardValue* _ct_bot;
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// Returns true if the card counts table has been reserved.
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bool has_reserved_count_table() { return _card_counts != NULL; }
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// Returns true if the card counts table has been reserved and committed.
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bool has_count_table() {
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return has_reserved_count_table();
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}
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size_t ptr_2_card_num(const CardValue* card_ptr) {
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assert(card_ptr >= _ct_bot,
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"Invalid card pointer: "
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"card_ptr: " PTR_FORMAT ", "
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"_ct_bot: " PTR_FORMAT,
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p2i(card_ptr), p2i(_ct_bot));
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size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(CardValue));
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assert(card_num < _reserved_max_card_num,
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"card pointer out of range: " PTR_FORMAT, p2i(card_ptr));
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return card_num;
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}
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CardValue* card_num_2_ptr(size_t card_num) {
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assert(card_num < _reserved_max_card_num,
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"card num out of range: " SIZE_FORMAT, card_num);
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return (CardValue*) (_ct_bot + card_num);
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}
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// Clear the counts table for the given (exclusive) index range.
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void clear_range(size_t from_card_num, size_t to_card_num);
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public:
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G1CardCounts(G1CollectedHeap* g1h);
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// Return the number of slots needed for a card counts table
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// that covers mem_region_words words.
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static size_t compute_size(size_t mem_region_size_in_words);
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// Returns how many bytes of the heap a single byte of the card counts table
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// corresponds to.
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static size_t heap_map_factor();
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void initialize(G1RegionToSpaceMapper* mapper);
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// Increments the refinement count for the given card.
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// Returns the pre-increment count value.
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uint add_card_count(CardValue* card_ptr);
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// Returns true if the given count is high enough to be considered
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// 'hot'; false otherwise.
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bool is_hot(uint count);
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// Clears the card counts for the cards spanned by the region
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void clear_region(HeapRegion* hr);
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// Clears the card counts for the cards spanned by the MemRegion
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void clear_range(MemRegion mr);
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// Clear the entire card counts table during GC.
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void clear_all();
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};
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#endif // SHARE_GC_G1_G1CARDCOUNTS_HPP
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