Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 1562:dfe27f03244a
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author | trims |
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_parMarkBitMap.cpp.incl" | |
27 | |
28 bool | |
29 ParMarkBitMap::initialize(MemRegion covered_region) | |
30 { | |
31 const idx_t bits = bits_required(covered_region); | |
32 // The bits will be divided evenly between two bitmaps; each of them should be | |
33 // an integral number of words. | |
34 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
35 | |
36 const size_t words = bits / BitsPerWord; | |
37 const size_t raw_bytes = words * sizeof(idx_t); | |
38 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
39 const size_t granularity = os::vm_allocation_granularity(); | |
40 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
41 | |
42 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
43 MAX2(page_sz, granularity); | |
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44 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 45 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
46 rs.base(), rs.size()); | |
47 _virtual_space = new PSVirtualSpace(rs, page_sz); | |
48 if (_virtual_space != NULL && _virtual_space->expand_by(bytes)) { | |
49 _region_start = covered_region.start(); | |
50 _region_size = covered_region.word_size(); | |
51 idx_t* map = (idx_t*)_virtual_space->reserved_low_addr(); | |
52 _beg_bits.set_map(map); | |
53 _beg_bits.set_size(bits / 2); | |
54 _end_bits.set_map(map + words / 2); | |
55 _end_bits.set_size(bits / 2); | |
56 return true; | |
57 } | |
58 | |
59 _region_start = 0; | |
60 _region_size = 0; | |
61 if (_virtual_space != NULL) { | |
62 delete _virtual_space; | |
63 _virtual_space = NULL; | |
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64 // Release memory reserved in the space. |
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65 rs.release(); |
0 | 66 } |
67 return false; | |
68 } | |
69 | |
70 #ifdef ASSERT | |
71 extern size_t mark_bitmap_count; | |
72 extern size_t mark_bitmap_size; | |
73 #endif // #ifdef ASSERT | |
74 | |
75 bool | |
76 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
77 { | |
78 const idx_t beg_bit = addr_to_bit(addr); | |
79 if (_beg_bits.par_set_bit(beg_bit)) { | |
80 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
81 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
82 assert(end_bit_ok, "concurrency problem"); | |
83 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
84 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
85 return true; | |
86 } | |
87 return false; | |
88 } | |
89 | |
90 size_t | |
91 ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, HeapWord* end_addr) const | |
92 { | |
93 assert(beg_addr <= end_addr, "bad range"); | |
94 | |
95 idx_t live_bits = 0; | |
96 | |
97 // The bitmap routines require the right boundary to be word-aligned. | |
98 const idx_t end_bit = addr_to_bit(end_addr); | |
99 const idx_t range_end = BitMap::word_align_up(end_bit); | |
100 | |
101 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
102 while (beg_bit < end_bit) { | |
103 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
104 if (tmp_end < end_bit) { | |
105 live_bits += tmp_end - beg_bit + 1; | |
106 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
107 } else { | |
108 live_bits += end_bit - beg_bit; // No + 1 here; end_bit is not counted. | |
109 return bits_to_words(live_bits); | |
110 } | |
111 } | |
112 return bits_to_words(live_bits); | |
113 } | |
114 | |
115 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
116 { | |
117 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
118 assert(is_marked(end_obj), "end_obj must be live"); | |
119 | |
120 idx_t live_bits = 0; | |
121 | |
122 // The bitmap routines require the right boundary to be word-aligned. | |
123 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
124 const idx_t range_end = BitMap::word_align_up(end_bit); | |
125 | |
126 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
127 while (beg_bit < end_bit) { | |
128 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
129 assert(tmp_end < end_bit, "missing end bit"); | |
130 live_bits += tmp_end - beg_bit + 1; | |
131 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
132 } | |
133 return bits_to_words(live_bits); | |
134 } | |
135 | |
136 ParMarkBitMap::IterationStatus | |
137 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
138 idx_t range_beg, idx_t range_end) const | |
139 { | |
140 DEBUG_ONLY(verify_bit(range_beg);) | |
141 DEBUG_ONLY(verify_bit(range_end);) | |
142 assert(range_beg <= range_end, "live range invalid"); | |
143 | |
144 // The bitmap routines require the right boundary to be word-aligned. | |
145 const idx_t search_end = BitMap::word_align_up(range_end); | |
146 | |
147 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
148 while (cur_beg < range_end) { | |
149 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
150 if (cur_end >= range_end) { | |
151 // The obj ends outside the range. | |
152 live_closure->set_source(bit_to_addr(cur_beg)); | |
153 return incomplete; | |
154 } | |
155 | |
156 const size_t size = obj_size(cur_beg, cur_end); | |
157 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
158 if (status != incomplete) { | |
159 assert(status == would_overflow || status == full, "sanity"); | |
160 return status; | |
161 } | |
162 | |
163 // Successfully processed the object; look for the next object. | |
164 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
165 } | |
166 | |
167 live_closure->set_source(bit_to_addr(range_end)); | |
168 return complete; | |
169 } | |
170 | |
171 ParMarkBitMap::IterationStatus | |
172 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
173 ParMarkBitMapClosure* dead_closure, | |
174 idx_t range_beg, idx_t range_end, | |
175 idx_t dead_range_end) const | |
176 { | |
177 DEBUG_ONLY(verify_bit(range_beg);) | |
178 DEBUG_ONLY(verify_bit(range_end);) | |
179 DEBUG_ONLY(verify_bit(dead_range_end);) | |
180 assert(range_beg <= range_end, "live range invalid"); | |
181 assert(range_end <= dead_range_end, "dead range invalid"); | |
182 | |
183 // The bitmap routines require the right boundary to be word-aligned. | |
184 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
185 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
186 | |
187 idx_t cur_beg = range_beg; | |
188 if (range_beg < range_end && is_unmarked(range_beg)) { | |
189 // The range starts with dead space. Look for the next object, then fill. | |
190 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
191 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
192 const size_t size = obj_size(range_beg, dead_space_end); | |
193 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
194 } | |
195 | |
196 while (cur_beg < range_end) { | |
197 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
198 if (cur_end >= range_end) { | |
199 // The obj ends outside the range. | |
200 live_closure->set_source(bit_to_addr(cur_beg)); | |
201 return incomplete; | |
202 } | |
203 | |
204 const size_t size = obj_size(cur_beg, cur_end); | |
205 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
206 if (status != incomplete) { | |
207 assert(status == would_overflow || status == full, "sanity"); | |
208 return status; | |
209 } | |
210 | |
211 // Look for the start of the next object. | |
212 const idx_t dead_space_beg = cur_end + 1; | |
213 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
214 if (cur_beg > dead_space_beg) { | |
215 // Found dead space; compute the size and invoke the dead closure. | |
216 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
217 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
218 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
219 } | |
220 } | |
221 | |
222 live_closure->set_source(bit_to_addr(range_end)); | |
223 return complete; | |
224 } | |
225 | |
226 #ifndef PRODUCT | |
227 void ParMarkBitMap::reset_counters() | |
228 { | |
229 _cas_tries = _cas_retries = _cas_by_another = 0; | |
230 } | |
231 #endif // #ifndef PRODUCT | |
232 | |
233 #ifdef ASSERT | |
234 void ParMarkBitMap::verify_clear() const | |
235 { | |
236 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
237 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
238 for (const idx_t* p = beg; p < end; ++p) { | |
239 assert(*p == 0, "bitmap not clear"); | |
240 } | |
241 } | |
242 #endif // #ifdef ASSERT |