Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 2225:c798c277ddd1
7015169: GC Cause not always set
Summary: Sometimes the gc cause was not always set. This caused JStat to print the wrong information.
Reviewed-by: tonyp, ysr
Contributed-by: suenaga.yasumasa@oss.ntt.co.jp
author | brutisso |
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date | Thu, 03 Feb 2011 20:49:09 -0800 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2005, 2010, 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 * | |
1552
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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/parMarkBitMap.inline.hpp" | |
28 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/os.hpp" | |
31 #include "utilities/bitMap.inline.hpp" | |
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 | |
0 | 41 |
42 bool | |
43 ParMarkBitMap::initialize(MemRegion covered_region) | |
44 { | |
45 const idx_t bits = bits_required(covered_region); | |
46 // The bits will be divided evenly between two bitmaps; each of them should be | |
47 // an integral number of words. | |
48 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
49 | |
50 const size_t words = bits / BitsPerWord; | |
51 const size_t raw_bytes = words * sizeof(idx_t); | |
52 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
53 const size_t granularity = os::vm_allocation_granularity(); | |
54 const size_t bytes = align_size_up(raw_bytes, MAX2(page_sz, granularity)); | |
55 | |
56 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
57 MAX2(page_sz, granularity); | |
79
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58 ReservedSpace rs(bytes, rs_align, rs_align > 0); |
0 | 59 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
60 rs.base(), rs.size()); | |
61 _virtual_space = new PSVirtualSpace(rs, page_sz); | |
62 if (_virtual_space != NULL && _virtual_space->expand_by(bytes)) { | |
63 _region_start = covered_region.start(); | |
64 _region_size = covered_region.word_size(); | |
65 idx_t* map = (idx_t*)_virtual_space->reserved_low_addr(); | |
66 _beg_bits.set_map(map); | |
67 _beg_bits.set_size(bits / 2); | |
68 _end_bits.set_map(map + words / 2); | |
69 _end_bits.set_size(bits / 2); | |
70 return true; | |
71 } | |
72 | |
73 _region_start = 0; | |
74 _region_size = 0; | |
75 if (_virtual_space != NULL) { | |
76 delete _virtual_space; | |
77 _virtual_space = NULL; | |
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78 // Release memory reserved in the space. |
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79 rs.release(); |
0 | 80 } |
81 return false; | |
82 } | |
83 | |
84 #ifdef ASSERT | |
85 extern size_t mark_bitmap_count; | |
86 extern size_t mark_bitmap_size; | |
87 #endif // #ifdef ASSERT | |
88 | |
89 bool | |
90 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
91 { | |
92 const idx_t beg_bit = addr_to_bit(addr); | |
93 if (_beg_bits.par_set_bit(beg_bit)) { | |
94 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
95 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
96 assert(end_bit_ok, "concurrency problem"); | |
97 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
98 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
99 return true; | |
100 } | |
101 return false; | |
102 } | |
103 | |
104 size_t | |
105 ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, HeapWord* end_addr) const | |
106 { | |
107 assert(beg_addr <= end_addr, "bad range"); | |
108 | |
109 idx_t live_bits = 0; | |
110 | |
111 // The bitmap routines require the right boundary to be word-aligned. | |
112 const idx_t end_bit = addr_to_bit(end_addr); | |
113 const idx_t range_end = BitMap::word_align_up(end_bit); | |
114 | |
115 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
116 while (beg_bit < end_bit) { | |
117 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
118 if (tmp_end < end_bit) { | |
119 live_bits += tmp_end - beg_bit + 1; | |
120 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
121 } else { | |
122 live_bits += end_bit - beg_bit; // No + 1 here; end_bit is not counted. | |
123 return bits_to_words(live_bits); | |
124 } | |
125 } | |
126 return bits_to_words(live_bits); | |
127 } | |
128 | |
129 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
130 { | |
131 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
132 assert(is_marked(end_obj), "end_obj must be live"); | |
133 | |
134 idx_t live_bits = 0; | |
135 | |
136 // The bitmap routines require the right boundary to be word-aligned. | |
137 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
138 const idx_t range_end = BitMap::word_align_up(end_bit); | |
139 | |
140 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
141 while (beg_bit < end_bit) { | |
142 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
143 assert(tmp_end < end_bit, "missing end bit"); | |
144 live_bits += tmp_end - beg_bit + 1; | |
145 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
146 } | |
147 return bits_to_words(live_bits); | |
148 } | |
149 | |
150 ParMarkBitMap::IterationStatus | |
151 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
152 idx_t range_beg, idx_t range_end) const | |
153 { | |
154 DEBUG_ONLY(verify_bit(range_beg);) | |
155 DEBUG_ONLY(verify_bit(range_end);) | |
156 assert(range_beg <= range_end, "live range invalid"); | |
157 | |
158 // The bitmap routines require the right boundary to be word-aligned. | |
159 const idx_t search_end = BitMap::word_align_up(range_end); | |
160 | |
161 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
162 while (cur_beg < range_end) { | |
163 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
164 if (cur_end >= range_end) { | |
165 // The obj ends outside the range. | |
166 live_closure->set_source(bit_to_addr(cur_beg)); | |
167 return incomplete; | |
168 } | |
169 | |
170 const size_t size = obj_size(cur_beg, cur_end); | |
171 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
172 if (status != incomplete) { | |
173 assert(status == would_overflow || status == full, "sanity"); | |
174 return status; | |
175 } | |
176 | |
177 // Successfully processed the object; look for the next object. | |
178 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
179 } | |
180 | |
181 live_closure->set_source(bit_to_addr(range_end)); | |
182 return complete; | |
183 } | |
184 | |
185 ParMarkBitMap::IterationStatus | |
186 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
187 ParMarkBitMapClosure* dead_closure, | |
188 idx_t range_beg, idx_t range_end, | |
189 idx_t dead_range_end) const | |
190 { | |
191 DEBUG_ONLY(verify_bit(range_beg);) | |
192 DEBUG_ONLY(verify_bit(range_end);) | |
193 DEBUG_ONLY(verify_bit(dead_range_end);) | |
194 assert(range_beg <= range_end, "live range invalid"); | |
195 assert(range_end <= dead_range_end, "dead range invalid"); | |
196 | |
197 // The bitmap routines require the right boundary to be word-aligned. | |
198 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
199 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
200 | |
201 idx_t cur_beg = range_beg; | |
202 if (range_beg < range_end && is_unmarked(range_beg)) { | |
203 // The range starts with dead space. Look for the next object, then fill. | |
204 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
205 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
206 const size_t size = obj_size(range_beg, dead_space_end); | |
207 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
208 } | |
209 | |
210 while (cur_beg < range_end) { | |
211 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
212 if (cur_end >= range_end) { | |
213 // The obj ends outside the range. | |
214 live_closure->set_source(bit_to_addr(cur_beg)); | |
215 return incomplete; | |
216 } | |
217 | |
218 const size_t size = obj_size(cur_beg, cur_end); | |
219 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
220 if (status != incomplete) { | |
221 assert(status == would_overflow || status == full, "sanity"); | |
222 return status; | |
223 } | |
224 | |
225 // Look for the start of the next object. | |
226 const idx_t dead_space_beg = cur_end + 1; | |
227 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
228 if (cur_beg > dead_space_beg) { | |
229 // Found dead space; compute the size and invoke the dead closure. | |
230 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
231 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
232 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
233 } | |
234 } | |
235 | |
236 live_closure->set_source(bit_to_addr(range_end)); | |
237 return complete; | |
238 } | |
239 | |
240 #ifndef PRODUCT | |
241 void ParMarkBitMap::reset_counters() | |
242 { | |
243 _cas_tries = _cas_retries = _cas_by_another = 0; | |
244 } | |
245 #endif // #ifndef PRODUCT | |
246 | |
247 #ifdef ASSERT | |
248 void ParMarkBitMap::verify_clear() const | |
249 { | |
250 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
251 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
252 for (const idx_t* p = beg; p < end; ++p) { | |
253 assert(*p == 0, "bitmap not clear"); | |
254 } | |
255 } | |
256 #endif // #ifdef ASSERT |