1 /*
2 * Copyright (c) 2001, 2012, 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 *
34 // We're based on the assumption that we use the same
35 // size blocks as the card table.
36 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity");
37 assert((int)block_size <= 512, "block_size must be less than or equal to 512");
38
39 // Calculate how much space must be reserved
40 _reserved_region = reserved_region;
41
42 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words;
43 assert(bytes_to_reserve > 0, "Sanity");
44
45 bytes_to_reserve =
46 align_size_up(bytes_to_reserve, os::vm_allocation_granularity());
47
48 // Do not use large-pages for the backing store. The one large page region
49 // will be used for the heap proper.
50 ReservedSpace backing_store(bytes_to_reserve);
51 if (!backing_store.is_reserved()) {
52 vm_exit_during_initialization("Could not reserve space for ObjectStartArray");
53 }
54 MemTracker::record_virtual_memory_type((address)backing_store.base(), mtGC);
55
56 // We do not commit any memory initially
57 if (!_virtual_space.initialize(backing_store, 0)) {
58 vm_exit_during_initialization("Could not commit space for ObjectStartArray");
59 }
60
61 _raw_base = (jbyte*)_virtual_space.low_boundary();
62
63 if (_raw_base == NULL) {
64 vm_exit_during_initialization("Could not get raw_base address");
65 }
66
67 MemTracker::record_virtual_memory_type((address)_raw_base, mtGC);
68
69
70 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift);
71
72 _covered_region.set_start(reserved_region.start());
73 _covered_region.set_word_size(0);
74
75 _blocks_region.set_start((HeapWord*)_raw_base);
76 _blocks_region.set_word_size(0);
77 }
78
79 void ObjectStartArray::set_covered_region(MemRegion mr) {
80 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space");
81 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region");
82
83 HeapWord* low_bound = mr.start();
84 HeapWord* high_bound = mr.end();
85 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary");
86 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary");
87
88 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words;
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1 /*
2 * Copyright (c) 2001, 2013, 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 *
34 // We're based on the assumption that we use the same
35 // size blocks as the card table.
36 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity");
37 assert((int)block_size <= 512, "block_size must be less than or equal to 512");
38
39 // Calculate how much space must be reserved
40 _reserved_region = reserved_region;
41
42 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words;
43 assert(bytes_to_reserve > 0, "Sanity");
44
45 bytes_to_reserve =
46 align_size_up(bytes_to_reserve, os::vm_allocation_granularity());
47
48 // Do not use large-pages for the backing store. The one large page region
49 // will be used for the heap proper.
50 ReservedSpace backing_store(bytes_to_reserve);
51 if (!backing_store.is_reserved()) {
52 vm_exit_during_initialization("Could not reserve space for ObjectStartArray");
53 }
54
55 NMTTrackOp op(NMTTrackOp::TypeOp);
56 op.execute_op((address)backing_store.base(), 0, mtGC);
57
58 // We do not commit any memory initially
59 if (!_virtual_space.initialize(backing_store, 0)) {
60 vm_exit_during_initialization("Could not commit space for ObjectStartArray");
61 }
62
63 _raw_base = (jbyte*)_virtual_space.low_boundary();
64
65 if (_raw_base == NULL) {
66 vm_exit_during_initialization("Could not get raw_base address");
67 }
68
69 op.execute_op((address)_raw_base, 0, mtGC);
70
71 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift);
72
73 _covered_region.set_start(reserved_region.start());
74 _covered_region.set_word_size(0);
75
76 _blocks_region.set_start((HeapWord*)_raw_base);
77 _blocks_region.set_word_size(0);
78 }
79
80 void ObjectStartArray::set_covered_region(MemRegion mr) {
81 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space");
82 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region");
83
84 HeapWord* low_bound = mr.start();
85 HeapWord* high_bound = mr.end();
86 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary");
87 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary");
88
89 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words;
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