g1FromCardCache.cpp revision 9865:a8f8a794a896 
1/*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "gc/g1/g1FromCardCache.hpp"
27#include "gc/g1/heapRegionRemSet.hpp"
28#include "memory/padded.inline.hpp"
29#include "utilities/debug.hpp"
30
31int**  FromCardCache::_cache = NULL;
32uint   FromCardCache::_max_regions = 0;
33size_t FromCardCache::_static_mem_size = 0;
34
35void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) {
36  guarantee(_cache == NULL, "Should not call this multiple times");
37
38  _max_regions = max_num_regions;
39  _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs,
40                                                       _max_regions,
41                                                       &_static_mem_size);
42
43  invalidate(0, _max_regions);
44}
45
46void FromCardCache::invalidate(uint start_idx, size_t new_num_regions) {
47  guarantee((size_t)start_idx + new_num_regions <= max_uintx,
48            "Trying to invalidate beyond maximum region, from %u size " SIZE_FORMAT,
49            start_idx, new_num_regions);
50  for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) {
51    uint end_idx = (start_idx + (uint)new_num_regions);
52    assert(end_idx <= _max_regions, "Must be within max.");
53    for (uint j = start_idx; j < end_idx; j++) {
54      set(i, j, InvalidCard);
55    }
56  }
57}
58
59#ifndef PRODUCT
60void FromCardCache::print(outputStream* out) {
61  for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) {
62    for (uint j = 0; j < _max_regions; j++) {
63      out->print_cr("_from_card_cache[%u][%u] = %d.",
64                    i, j, at(i, j));
65    }
66  }
67}
68#endif
69
70void FromCardCache::clear(uint region_idx) {
71  uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets();
72  for (uint i = 0; i < num_par_remsets; i++) {
73    set(i, region_idx, InvalidCard);
74  }
75}
76