1 /* |
|
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
|
3 * Copyright (c) 2018 SAP SE. All rights reserved. |
|
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
|
5 * |
|
6 * This code is free software; you can redistribute it and/or modify it |
|
7 * under the terms of the GNU General Public License version 2 only, as |
|
8 * published by the Free Software Foundation. |
|
9 * |
|
10 * This code is distributed in the hope that it will be useful, but WITHOUT |
|
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
13 * version 2 for more details (a copy is included in the LICENSE file that |
|
14 * accompanied this code). |
|
15 * |
|
16 * You should have received a copy of the GNU General Public License version |
|
17 * 2 along with this work; if not, write to the Free Software Foundation, |
|
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
19 * |
|
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
21 * or visit www.oracle.com if you need additional information or have any |
|
22 * questions. |
|
23 * |
|
24 */ |
|
25 |
|
26 #include "precompiled.hpp" |
|
27 #include "utilities/debug.hpp" |
|
28 #include "utilities/globalDefinitions.hpp" |
|
29 #include "memory/metaspace/metachunk.hpp" |
|
30 #include "memory/metaspace/occupancyMap.hpp" |
|
31 #include "runtime/os.hpp" |
|
32 |
|
33 namespace metaspace { |
|
34 |
|
35 OccupancyMap::OccupancyMap(const MetaWord* reference_address, size_t word_size, size_t smallest_chunk_word_size) : |
|
36 _reference_address(reference_address), _word_size(word_size), |
|
37 _smallest_chunk_word_size(smallest_chunk_word_size) |
|
38 { |
|
39 assert(reference_address != NULL, "invalid reference address"); |
|
40 assert(is_aligned(reference_address, smallest_chunk_word_size), |
|
41 "Reference address not aligned to smallest chunk size."); |
|
42 assert(is_aligned(word_size, smallest_chunk_word_size), |
|
43 "Word_size shall be a multiple of the smallest chunk size."); |
|
44 // Calculate bitmap size: one bit per smallest_chunk_word_size'd area. |
|
45 size_t num_bits = word_size / smallest_chunk_word_size; |
|
46 _map_size = (num_bits + 7) / 8; |
|
47 assert(_map_size * 8 >= num_bits, "sanity"); |
|
48 _map[0] = (uint8_t*) os::malloc(_map_size, mtInternal); |
|
49 _map[1] = (uint8_t*) os::malloc(_map_size, mtInternal); |
|
50 assert(_map[0] != NULL && _map[1] != NULL, "Occupancy Map: allocation failed."); |
|
51 memset(_map[1], 0, _map_size); |
|
52 memset(_map[0], 0, _map_size); |
|
53 // Sanity test: the first respectively last possible chunk start address in |
|
54 // the covered range shall map to the first and last bit in the bitmap. |
|
55 assert(get_bitpos_for_address(reference_address) == 0, |
|
56 "First chunk address in range must map to fist bit in bitmap."); |
|
57 assert(get_bitpos_for_address(reference_address + word_size - smallest_chunk_word_size) == num_bits - 1, |
|
58 "Last chunk address in range must map to last bit in bitmap."); |
|
59 } |
|
60 |
|
61 OccupancyMap::~OccupancyMap() { |
|
62 os::free(_map[0]); |
|
63 os::free(_map[1]); |
|
64 } |
|
65 |
|
66 #ifdef ASSERT |
|
67 // Verify occupancy map for the address range [from, to). |
|
68 // We need to tell it the address range, because the memory the |
|
69 // occupancy map is covering may not be fully comitted yet. |
|
70 void OccupancyMap::verify(MetaWord* from, MetaWord* to) { |
|
71 Metachunk* chunk = NULL; |
|
72 int nth_bit_for_chunk = 0; |
|
73 MetaWord* chunk_end = NULL; |
|
74 for (MetaWord* p = from; p < to; p += _smallest_chunk_word_size) { |
|
75 const unsigned pos = get_bitpos_for_address(p); |
|
76 // Check the chunk-starts-info: |
|
77 if (get_bit_at_position(pos, layer_chunk_start_map)) { |
|
78 // Chunk start marked in bitmap. |
|
79 chunk = (Metachunk*) p; |
|
80 if (chunk_end != NULL) { |
|
81 assert(chunk_end == p, "Unexpected chunk start found at %p (expected " |
|
82 "the next chunk to start at %p).", p, chunk_end); |
|
83 } |
|
84 assert(chunk->is_valid_sentinel(), "Invalid chunk at address %p.", p); |
|
85 if (chunk->get_chunk_type() != HumongousIndex) { |
|
86 guarantee(is_aligned(p, chunk->word_size()), "Chunk %p not aligned.", p); |
|
87 } |
|
88 chunk_end = p + chunk->word_size(); |
|
89 nth_bit_for_chunk = 0; |
|
90 assert(chunk_end <= to, "Chunk end overlaps test address range."); |
|
91 } else { |
|
92 // No chunk start marked in bitmap. |
|
93 assert(chunk != NULL, "Chunk should start at start of address range."); |
|
94 assert(p < chunk_end, "Did not find expected chunk start at %p.", p); |
|
95 nth_bit_for_chunk ++; |
|
96 } |
|
97 // Check the in-use-info: |
|
98 const bool in_use_bit = get_bit_at_position(pos, layer_in_use_map); |
|
99 if (in_use_bit) { |
|
100 assert(!chunk->is_tagged_free(), "Chunk %p: marked in-use in map but is free (bit %u).", |
|
101 chunk, nth_bit_for_chunk); |
|
102 } else { |
|
103 assert(chunk->is_tagged_free(), "Chunk %p: marked free in map but is in use (bit %u).", |
|
104 chunk, nth_bit_for_chunk); |
|
105 } |
|
106 } |
|
107 } |
|
108 |
|
109 // Verify that a given chunk is correctly accounted for in the bitmap. |
|
110 void OccupancyMap::verify_for_chunk(Metachunk* chunk) { |
|
111 assert(chunk_starts_at_address((MetaWord*) chunk), |
|
112 "No chunk start marked in map for chunk %p.", chunk); |
|
113 // For chunks larger than the minimal chunk size, no other chunk |
|
114 // must start in its area. |
|
115 if (chunk->word_size() > _smallest_chunk_word_size) { |
|
116 assert(!is_any_bit_set_in_region(((MetaWord*) chunk) + _smallest_chunk_word_size, |
|
117 chunk->word_size() - _smallest_chunk_word_size, layer_chunk_start_map), |
|
118 "No chunk must start within another chunk."); |
|
119 } |
|
120 if (!chunk->is_tagged_free()) { |
|
121 assert(is_region_in_use((MetaWord*)chunk, chunk->word_size()), |
|
122 "Chunk %p is in use but marked as free in map (%d %d).", |
|
123 chunk, chunk->get_chunk_type(), chunk->get_origin()); |
|
124 } else { |
|
125 assert(!is_region_in_use((MetaWord*)chunk, chunk->word_size()), |
|
126 "Chunk %p is free but marked as in-use in map (%d %d).", |
|
127 chunk, chunk->get_chunk_type(), chunk->get_origin()); |
|
128 } |
|
129 } |
|
130 |
|
131 #endif // ASSERT |
|
132 |
|
133 } // namespace metaspace |
|
134 |
|
135 |
|