1 /*
2 * Copyright (c) 2014, 2016, 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
27 #include "gc/shared/blockOffsetTable.inline.hpp"
28 #include "gc/shared/cardGeneration.inline.hpp"
29 #include "gc/shared/cardTableRS.hpp"
30 #include "gc/shared/gcLocker.hpp"
31 #include "gc/shared/genOopClosures.inline.hpp"
32 #include "gc/shared/generationSpec.hpp"
33 #include "gc/shared/space.inline.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/memRegion.hpp"
36 #include "logging/log.hpp"
37 #include "runtime/java.hpp"
38
39 CardGeneration::CardGeneration(ReservedSpace rs,
40 size_t initial_byte_size,
41 CardTableRS* remset) :
42 Generation(rs, initial_byte_size), _rs(remset),
43 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(),
44 _used_at_prologue()
45 {
46 HeapWord* start = (HeapWord*)rs.base();
47 size_t reserved_byte_size = rs.size();
48 assert((uintptr_t(start) & 3) == 0, "bad alignment");
49 assert((reserved_byte_size & 3) == 0, "bad alignment");
50 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size));
51 _bts = new BlockOffsetSharedArray(reserved_mr,
52 heap_word_size(initial_byte_size));
53 MemRegion committed_mr(start, heap_word_size(initial_byte_size));
54 _rs->resize_covered_region(committed_mr);
55 if (_bts == NULL) {
56 vm_exit_during_initialization("Could not allocate a BlockOffsetArray");
57 }
58
59 // Verify that the start and end of this generation is the start of a card.
60 // If this wasn't true, a single card could span more than on generation,
61 // which would cause problems when we commit/uncommit memory, and when we
62 // clear and dirty cards.
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1 /*
2 * Copyright (c) 2014, 2017, 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
27 #include "gc/shared/blockOffsetTable.inline.hpp"
28 #include "gc/shared/cardGeneration.inline.hpp"
29 #include "gc/shared/cardTableRS.hpp"
30 #include "gc/shared/gcLocker.hpp"
31 #include "gc/shared/genOopClosures.inline.hpp"
32 #include "gc/shared/generationSpec.hpp"
33 #include "gc/shared/space.inline.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/memRegion.hpp"
36 #include "logging/log.hpp"
37 #include "runtime/java.hpp"
38
39 CardGeneration::CardGeneration(ReservedSpace rs,
40 size_t initial_byte_size,
41 GCMemoryManager* mem_mgr,
42 CardTableRS* remset) :
43 Generation(rs, initial_byte_size, mem_mgr), _rs(remset),
44 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(),
45 _used_at_prologue()
46 {
47 HeapWord* start = (HeapWord*)rs.base();
48 size_t reserved_byte_size = rs.size();
49 assert((uintptr_t(start) & 3) == 0, "bad alignment");
50 assert((reserved_byte_size & 3) == 0, "bad alignment");
51 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size));
52 _bts = new BlockOffsetSharedArray(reserved_mr,
53 heap_word_size(initial_byte_size));
54 MemRegion committed_mr(start, heap_word_size(initial_byte_size));
55 _rs->resize_covered_region(committed_mr);
56 if (_bts == NULL) {
57 vm_exit_during_initialization("Could not allocate a BlockOffsetArray");
58 }
59
60 // Verify that the start and end of this generation is the start of a card.
61 // If this wasn't true, a single card could span more than on generation,
62 // which would cause problems when we commit/uncommit memory, and when we
63 // clear and dirty cards.
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