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/*
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* Copyright (c) 2013, 2015, 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_VM_GC_G1_G1FROMCARDCACHE_HPP
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#define SHARE_VM_GC_G1_G1FROMCARDCACHE_HPP
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#include "memory/allocation.hpp"
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#include "utilities/ostream.hpp"
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// The FromCardCache remembers the most recently processed card on the heap on
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// a per-region and per-thread basis.
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class FromCardCache : public AllStatic {
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private:
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// Array of card indices. Indexed by thread X and heap region to minimize
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// thread contention.
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static int** _cache;
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static uint _max_regions;
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static size_t _static_mem_size;
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public:
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enum {
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InvalidCard = -1 // Card value of an invalid card, i.e. a card index not otherwise used.
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};
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static void clear(uint region_idx);
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// Returns true if the given card is in the cache at the given location, or
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// replaces the card at that location and returns false.
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static bool contains_or_replace(uint worker_id, uint region_idx, int card) {
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int card_in_cache = at(worker_id, region_idx);
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if (card_in_cache == card) {
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return true;
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} else {
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set(worker_id, region_idx, card);
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return false;
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}
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}
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static int at(uint worker_id, uint region_idx) {
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return _cache[worker_id][region_idx];
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}
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static void set(uint worker_id, uint region_idx, int val) {
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_cache[worker_id][region_idx] = val;
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}
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static void initialize(uint n_par_rs, uint max_num_regions);
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static void invalidate(uint start_idx, size_t num_regions);
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static void print(outputStream* out = tty) PRODUCT_RETURN;
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static size_t static_mem_size() {
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return _static_mem_size;
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}
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};
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#endif // SHARE_VM_GC_G1_G1FROMCARDCACHE_HPP
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