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annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, 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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
28 #include "oops/oop.inline.hpp" | |
29 #include "runtime/os.hpp" | |
30 #include "utilities/bitMap.inline.hpp" | |
6197 | 31 #include "services/memTracker.hpp" |
1972 | 32 #ifdef TARGET_OS_FAMILY_linux |
33 # include "os_linux.inline.hpp" | |
34 #endif | |
35 #ifdef TARGET_OS_FAMILY_solaris | |
36 # include "os_solaris.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_FAMILY_windows | |
39 # include "os_windows.inline.hpp" | |
40 #endif | |
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41 #ifdef TARGET_OS_FAMILY_aix |
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42 # include "os_aix.inline.hpp" |
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43 #endif |
3960 | 44 #ifdef TARGET_OS_FAMILY_bsd |
45 # include "os_bsd.inline.hpp" | |
46 #endif | |
0 | 47 |
48 bool | |
49 ParMarkBitMap::initialize(MemRegion covered_region) | |
50 { | |
51 const idx_t bits = bits_required(covered_region); | |
52 // The bits will be divided evenly between two bitmaps; each of them should be | |
53 // an integral number of words. | |
54 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
55 | |
56 const size_t words = bits / BitsPerWord; | |
57 const size_t raw_bytes = words * sizeof(idx_t); | |
58 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
59 const size_t granularity = os::vm_allocation_granularity(); | |
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60 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
0 | 61 |
62 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
63 MAX2(page_sz, granularity); | |
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64 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
0 | 65 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
66 rs.base(), rs.size()); | |
6197 | 67 |
68 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
69 | |
0 | 70 _virtual_space = new PSVirtualSpace(rs, page_sz); |
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71 if (_virtual_space != NULL && _virtual_space->expand_by(_reserved_byte_size)) { |
0 | 72 _region_start = covered_region.start(); |
73 _region_size = covered_region.word_size(); | |
74 idx_t* map = (idx_t*)_virtual_space->reserved_low_addr(); | |
75 _beg_bits.set_map(map); | |
76 _beg_bits.set_size(bits / 2); | |
77 _end_bits.set_map(map + words / 2); | |
78 _end_bits.set_size(bits / 2); | |
79 return true; | |
80 } | |
81 | |
82 _region_start = 0; | |
83 _region_size = 0; | |
84 if (_virtual_space != NULL) { | |
85 delete _virtual_space; | |
86 _virtual_space = NULL; | |
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87 // Release memory reserved in the space. |
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88 rs.release(); |
0 | 89 } |
90 return false; | |
91 } | |
92 | |
93 #ifdef ASSERT | |
94 extern size_t mark_bitmap_count; | |
95 extern size_t mark_bitmap_size; | |
96 #endif // #ifdef ASSERT | |
97 | |
98 bool | |
99 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
100 { | |
101 const idx_t beg_bit = addr_to_bit(addr); | |
102 if (_beg_bits.par_set_bit(beg_bit)) { | |
103 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
104 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
105 assert(end_bit_ok, "concurrency problem"); | |
106 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
107 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
108 return true; | |
109 } | |
110 return false; | |
111 } | |
112 | |
113 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
114 { | |
115 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
116 assert(is_marked(end_obj), "end_obj must be live"); | |
117 | |
118 idx_t live_bits = 0; | |
119 | |
120 // The bitmap routines require the right boundary to be word-aligned. | |
121 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
122 const idx_t range_end = BitMap::word_align_up(end_bit); | |
123 | |
124 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
125 while (beg_bit < end_bit) { | |
126 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
127 assert(tmp_end < end_bit, "missing end bit"); | |
128 live_bits += tmp_end - beg_bit + 1; | |
129 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
130 } | |
131 return bits_to_words(live_bits); | |
132 } | |
133 | |
134 ParMarkBitMap::IterationStatus | |
135 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
136 idx_t range_beg, idx_t range_end) const | |
137 { | |
138 DEBUG_ONLY(verify_bit(range_beg);) | |
139 DEBUG_ONLY(verify_bit(range_end);) | |
140 assert(range_beg <= range_end, "live range invalid"); | |
141 | |
142 // The bitmap routines require the right boundary to be word-aligned. | |
143 const idx_t search_end = BitMap::word_align_up(range_end); | |
144 | |
145 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
146 while (cur_beg < range_end) { | |
147 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
148 if (cur_end >= range_end) { | |
149 // The obj ends outside the range. | |
150 live_closure->set_source(bit_to_addr(cur_beg)); | |
151 return incomplete; | |
152 } | |
153 | |
154 const size_t size = obj_size(cur_beg, cur_end); | |
155 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
156 if (status != incomplete) { | |
157 assert(status == would_overflow || status == full, "sanity"); | |
158 return status; | |
159 } | |
160 | |
161 // Successfully processed the object; look for the next object. | |
162 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
163 } | |
164 | |
165 live_closure->set_source(bit_to_addr(range_end)); | |
166 return complete; | |
167 } | |
168 | |
169 ParMarkBitMap::IterationStatus | |
170 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
171 ParMarkBitMapClosure* dead_closure, | |
172 idx_t range_beg, idx_t range_end, | |
173 idx_t dead_range_end) const | |
174 { | |
175 DEBUG_ONLY(verify_bit(range_beg);) | |
176 DEBUG_ONLY(verify_bit(range_end);) | |
177 DEBUG_ONLY(verify_bit(dead_range_end);) | |
178 assert(range_beg <= range_end, "live range invalid"); | |
179 assert(range_end <= dead_range_end, "dead range invalid"); | |
180 | |
181 // The bitmap routines require the right boundary to be word-aligned. | |
182 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
183 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
184 | |
185 idx_t cur_beg = range_beg; | |
186 if (range_beg < range_end && is_unmarked(range_beg)) { | |
187 // The range starts with dead space. Look for the next object, then fill. | |
188 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
189 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
190 const size_t size = obj_size(range_beg, dead_space_end); | |
191 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
192 } | |
193 | |
194 while (cur_beg < range_end) { | |
195 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
196 if (cur_end >= range_end) { | |
197 // The obj ends outside the range. | |
198 live_closure->set_source(bit_to_addr(cur_beg)); | |
199 return incomplete; | |
200 } | |
201 | |
202 const size_t size = obj_size(cur_beg, cur_end); | |
203 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
204 if (status != incomplete) { | |
205 assert(status == would_overflow || status == full, "sanity"); | |
206 return status; | |
207 } | |
208 | |
209 // Look for the start of the next object. | |
210 const idx_t dead_space_beg = cur_end + 1; | |
211 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
212 if (cur_beg > dead_space_beg) { | |
213 // Found dead space; compute the size and invoke the dead closure. | |
214 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
215 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
216 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
217 } | |
218 } | |
219 | |
220 live_closure->set_source(bit_to_addr(range_end)); | |
221 return complete; | |
222 } | |
223 | |
224 #ifdef ASSERT | |
225 void ParMarkBitMap::verify_clear() const | |
226 { | |
227 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
228 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
229 for (const idx_t* p = beg; p < end; ++p) { | |
230 assert(*p == 0, "bitmap not clear"); | |
231 } | |
232 } | |
233 #endif // #ifdef ASSERT |