1/*
2 * Copyright (c) 2001, 2018, 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/g1RemSet.hpp"
28#include "memory/padded.inline.hpp"
29#include "utilities/debug.hpp"
30
31uintptr_t** G1FromCardCache::_cache = NULL;
32uint G1FromCardCache::_max_regions = 0;
33size_t G1FromCardCache::_static_mem_size = 0;
34#ifdef ASSERT
35uint G1FromCardCache::_max_workers = 0;
36#endif
37
38void G1FromCardCache::initialize(uint num_par_rem_sets, uint max_num_regions) {
39 guarantee(max_num_regions > 0, "Heap size must be valid");
40 guarantee(_cache == NULL, "Should not call this multiple times");
41
42 _max_regions = max_num_regions;
43#ifdef ASSERT
44 _max_workers = num_par_rem_sets;
45#endif
46 _cache = Padded2DArray<uintptr_t, mtGC>::create_unfreeable(_max_regions,
47 num_par_rem_sets,
48 &_static_mem_size);
49
50 if (AlwaysPreTouch) {
51 invalidate(0, _max_regions);
52 }
53}
54
55void G1FromCardCache::invalidate(uint start_idx, size_t new_num_regions) {
56 guarantee((size_t)start_idx + new_num_regions <= max_uintx,
57 "Trying to invalidate beyond maximum region, from %u size " SIZE_FORMAT,
58 start_idx, new_num_regions);
59 uint end_idx = (start_idx + (uint)new_num_regions);
60 assert(end_idx <= _max_regions, "Must be within max.");
61
62 for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
63 for (uint j = start_idx; j < end_idx; j++) {
64 set(i, j, InvalidCard);
65 }
66 }
67}
68
69#ifndef PRODUCT
70void G1FromCardCache::print(outputStream* out) {
71 for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {
72 for (uint j = 0; j < _max_regions; j++) {
73 out->print_cr("_from_card_cache[%u][%u] = " SIZE_FORMAT ".",
74 i, j, at(i, j));
75 }
76 }
77}
78#endif
79
80void G1FromCardCache::clear(uint region_idx) {
81 uint num_par_remsets = G1RemSet::num_par_rem_sets();
82 for (uint i = 0; i < num_par_remsets; i++) {
83 set(i, region_idx, InvalidCard);
84 }
85}
86