Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.cpp @ 4058:59e515ee9354
7059047: EA: can't find initializing store with several CheckCastPP
Summary: Split adjust_escape_state() method into two methods to find initializing stores.
Reviewed-by: never
author | kvn |
---|---|
date | Mon, 07 Nov 2011 14:33:57 -0800 |
parents | fc2b798ab316 |
children | bca17e38de00 |
rev | line source |
---|---|
0 | 1 /* |
3256
c69b1043dfb1
7036482: clear argument is redundant and unused in cardtable methods
ysr
parents:
1972
diff
changeset
|
2 * Copyright (c) 2000, 2011, 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
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1091
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1091
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1091
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "memory/cardTableModRefBS.hpp" | |
28 #include "memory/cardTableRS.hpp" | |
29 #include "memory/sharedHeap.hpp" | |
30 #include "memory/space.hpp" | |
31 #include "memory/space.inline.hpp" | |
32 #include "memory/universe.hpp" | |
33 #include "runtime/java.hpp" | |
34 #include "runtime/mutexLocker.hpp" | |
35 #include "runtime/virtualspace.hpp" | |
36 #ifdef COMPILER1 | |
37 #include "c1/c1_LIR.hpp" | |
38 #include "c1/c1_LIRGenerator.hpp" | |
39 #endif | |
40 | |
0 | 41 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
42 // enumerate ref fields that have been modified (since the last | |
43 // enumeration.) | |
44 | |
45 size_t CardTableModRefBS::cards_required(size_t covered_words) | |
46 { | |
47 // Add one for a guard card, used to detect errors. | |
48 const size_t words = align_size_up(covered_words, card_size_in_words); | |
49 return words / card_size_in_words + 1; | |
50 } | |
51 | |
52 size_t CardTableModRefBS::compute_byte_map_size() | |
53 { | |
54 assert(_guard_index == cards_required(_whole_heap.word_size()) - 1, | |
55 "unitialized, check declaration order"); | |
56 assert(_page_size != 0, "unitialized, check declaration order"); | |
57 const size_t granularity = os::vm_allocation_granularity(); | |
58 return align_size_up(_guard_index + 1, MAX2(_page_size, granularity)); | |
59 } | |
60 | |
61 CardTableModRefBS::CardTableModRefBS(MemRegion whole_heap, | |
62 int max_covered_regions): | |
63 ModRefBarrierSet(max_covered_regions), | |
64 _whole_heap(whole_heap), | |
65 _guard_index(cards_required(whole_heap.word_size()) - 1), | |
66 _last_valid_index(_guard_index - 1), | |
21 | 67 _page_size(os::vm_page_size()), |
0 | 68 _byte_map_size(compute_byte_map_size()) |
69 { | |
70 _kind = BarrierSet::CardTableModRef; | |
71 | |
72 HeapWord* low_bound = _whole_heap.start(); | |
73 HeapWord* high_bound = _whole_heap.end(); | |
74 assert((uintptr_t(low_bound) & (card_size - 1)) == 0, "heap must start at card boundary"); | |
75 assert((uintptr_t(high_bound) & (card_size - 1)) == 0, "heap must end at card boundary"); | |
76 | |
77 assert(card_size <= 512, "card_size must be less than 512"); // why? | |
78 | |
79 _covered = new MemRegion[max_covered_regions]; | |
80 _committed = new MemRegion[max_covered_regions]; | |
81 if (_covered == NULL || _committed == NULL) | |
82 vm_exit_during_initialization("couldn't alloc card table covered region set."); | |
83 int i; | |
84 for (i = 0; i < max_covered_regions; i++) { | |
85 _covered[i].set_word_size(0); | |
86 _committed[i].set_word_size(0); | |
87 } | |
88 _cur_covered_regions = 0; | |
89 | |
90 const size_t rs_align = _page_size == (size_t) os::vm_page_size() ? 0 : | |
91 MAX2(_page_size, (size_t) os::vm_allocation_granularity()); | |
92 ReservedSpace heap_rs(_byte_map_size, rs_align, false); | |
93 os::trace_page_sizes("card table", _guard_index + 1, _guard_index + 1, | |
94 _page_size, heap_rs.base(), heap_rs.size()); | |
95 if (!heap_rs.is_reserved()) { | |
96 vm_exit_during_initialization("Could not reserve enough space for the " | |
97 "card marking array"); | |
98 } | |
99 | |
100 // The assember store_check code will do an unsigned shift of the oop, | |
101 // then add it to byte_map_base, i.e. | |
102 // | |
103 // _byte_map = byte_map_base + (uintptr_t(low_bound) >> card_shift) | |
104 _byte_map = (jbyte*) heap_rs.base(); | |
105 byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); | |
106 assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map"); | |
107 assert(byte_for(high_bound-1) <= &_byte_map[_last_valid_index], "Checking end of map"); | |
108 | |
109 jbyte* guard_card = &_byte_map[_guard_index]; | |
110 uintptr_t guard_page = align_size_down((uintptr_t)guard_card, _page_size); | |
111 _guard_region = MemRegion((HeapWord*)guard_page, _page_size); | |
112 if (!os::commit_memory((char*)guard_page, _page_size, _page_size)) { | |
113 // Do better than this for Merlin | |
114 vm_exit_out_of_memory(_page_size, "card table last card"); | |
115 } | |
116 *guard_card = last_card; | |
117 | |
118 _lowest_non_clean = | |
119 NEW_C_HEAP_ARRAY(CardArr, max_covered_regions); | |
120 _lowest_non_clean_chunk_size = | |
121 NEW_C_HEAP_ARRAY(size_t, max_covered_regions); | |
122 _lowest_non_clean_base_chunk_index = | |
123 NEW_C_HEAP_ARRAY(uintptr_t, max_covered_regions); | |
124 _last_LNC_resizing_collection = | |
125 NEW_C_HEAP_ARRAY(int, max_covered_regions); | |
126 if (_lowest_non_clean == NULL | |
127 || _lowest_non_clean_chunk_size == NULL | |
128 || _lowest_non_clean_base_chunk_index == NULL | |
129 || _last_LNC_resizing_collection == NULL) | |
130 vm_exit_during_initialization("couldn't allocate an LNC array."); | |
131 for (i = 0; i < max_covered_regions; i++) { | |
132 _lowest_non_clean[i] = NULL; | |
133 _lowest_non_clean_chunk_size[i] = 0; | |
134 _last_LNC_resizing_collection[i] = -1; | |
135 } | |
136 | |
137 if (TraceCardTableModRefBS) { | |
138 gclog_or_tty->print_cr("CardTableModRefBS::CardTableModRefBS: "); | |
139 gclog_or_tty->print_cr(" " | |
140 " &_byte_map[0]: " INTPTR_FORMAT | |
141 " &_byte_map[_last_valid_index]: " INTPTR_FORMAT, | |
142 &_byte_map[0], | |
143 &_byte_map[_last_valid_index]); | |
144 gclog_or_tty->print_cr(" " | |
145 " byte_map_base: " INTPTR_FORMAT, | |
146 byte_map_base); | |
147 } | |
148 } | |
149 | |
150 int CardTableModRefBS::find_covering_region_by_base(HeapWord* base) { | |
151 int i; | |
152 for (i = 0; i < _cur_covered_regions; i++) { | |
153 if (_covered[i].start() == base) return i; | |
154 if (_covered[i].start() > base) break; | |
155 } | |
156 // If we didn't find it, create a new one. | |
157 assert(_cur_covered_regions < _max_covered_regions, | |
158 "too many covered regions"); | |
159 // Move the ones above up, to maintain sorted order. | |
160 for (int j = _cur_covered_regions; j > i; j--) { | |
161 _covered[j] = _covered[j-1]; | |
162 _committed[j] = _committed[j-1]; | |
163 } | |
164 int res = i; | |
165 _cur_covered_regions++; | |
166 _covered[res].set_start(base); | |
167 _covered[res].set_word_size(0); | |
168 jbyte* ct_start = byte_for(base); | |
169 uintptr_t ct_start_aligned = align_size_down((uintptr_t)ct_start, _page_size); | |
170 _committed[res].set_start((HeapWord*)ct_start_aligned); | |
171 _committed[res].set_word_size(0); | |
172 return res; | |
173 } | |
174 | |
175 int CardTableModRefBS::find_covering_region_containing(HeapWord* addr) { | |
176 for (int i = 0; i < _cur_covered_regions; i++) { | |
177 if (_covered[i].contains(addr)) { | |
178 return i; | |
179 } | |
180 } | |
181 assert(0, "address outside of heap?"); | |
182 return -1; | |
183 } | |
184 | |
185 HeapWord* CardTableModRefBS::largest_prev_committed_end(int ind) const { | |
186 HeapWord* max_end = NULL; | |
187 for (int j = 0; j < ind; j++) { | |
188 HeapWord* this_end = _committed[j].end(); | |
189 if (this_end > max_end) max_end = this_end; | |
190 } | |
191 return max_end; | |
192 } | |
193 | |
194 MemRegion CardTableModRefBS::committed_unique_to_self(int self, | |
195 MemRegion mr) const { | |
196 MemRegion result = mr; | |
197 for (int r = 0; r < _cur_covered_regions; r += 1) { | |
198 if (r != self) { | |
199 result = result.minus(_committed[r]); | |
200 } | |
201 } | |
202 // Never include the guard page. | |
203 result = result.minus(_guard_region); | |
204 return result; | |
205 } | |
206 | |
207 void CardTableModRefBS::resize_covered_region(MemRegion new_region) { | |
208 // We don't change the start of a region, only the end. | |
209 assert(_whole_heap.contains(new_region), | |
210 "attempt to cover area not in reserved area"); | |
211 debug_only(verify_guard();) | |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
212 // collided is true if the expansion would push into another committed region |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
213 debug_only(bool collided = false;) |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
214 int const ind = find_covering_region_by_base(new_region.start()); |
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
215 MemRegion const old_region = _covered[ind]; |
0 | 216 assert(old_region.start() == new_region.start(), "just checking"); |
217 if (new_region.word_size() != old_region.word_size()) { | |
218 // Commit new or uncommit old pages, if necessary. | |
219 MemRegion cur_committed = _committed[ind]; | |
220 // Extend the end of this _commited region | |
221 // to cover the end of any lower _committed regions. | |
222 // This forms overlapping regions, but never interior regions. | |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
223 HeapWord* const max_prev_end = largest_prev_committed_end(ind); |
0 | 224 if (max_prev_end > cur_committed.end()) { |
225 cur_committed.set_end(max_prev_end); | |
226 } | |
227 // Align the end up to a page size (starts are already aligned). | |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
228 jbyte* const new_end = byte_after(new_region.last()); |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
229 HeapWord* new_end_aligned = |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
230 (HeapWord*) align_size_up((uintptr_t)new_end, _page_size); |
0 | 231 assert(new_end_aligned >= (HeapWord*) new_end, |
232 "align up, but less"); | |
581
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
233 // Check the other regions (excludes "ind") to ensure that |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
234 // the new_end_aligned does not intrude onto the committed |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
235 // space of another region. |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
236 int ri = 0; |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
237 for (ri = 0; ri < _cur_covered_regions; ri++) { |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
238 if (ri != ind) { |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
239 if (_committed[ri].contains(new_end_aligned)) { |
581
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
240 // The prior check included in the assert |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
241 // (new_end_aligned >= _committed[ri].start()) |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
242 // is redundant with the "contains" test. |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
243 // Any region containing the new end |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
244 // should start at or beyond the region found (ind) |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
245 // for the new end (committed regions are not expected to |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
246 // be proper subsets of other committed regions). |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
247 assert(_committed[ri].start() >= _committed[ind].start(), |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
248 "New end of committed region is inconsistent"); |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
249 new_end_aligned = _committed[ri].start(); |
581
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
250 // new_end_aligned can be equal to the start of its |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
251 // committed region (i.e., of "ind") if a second |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
252 // region following "ind" also start at the same location |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
253 // as "ind". |
9e5a6ed08fc9
6786346: intermittent Internal Error (src/share/vm/memory/cardTableModRefBS.cpp:226)
jmasa
parents:
489
diff
changeset
|
254 assert(new_end_aligned >= _committed[ind].start(), |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
255 "New end of committed region is before start"); |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
256 debug_only(collided = true;) |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
257 // Should only collide with 1 region |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
258 break; |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
259 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
260 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
261 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
262 #ifdef ASSERT |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
263 for (++ri; ri < _cur_covered_regions; ri++) { |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
264 assert(!_committed[ri].contains(new_end_aligned), |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
265 "New end of committed region is in a second committed region"); |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
266 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
267 #endif |
0 | 268 // The guard page is always committed and should not be committed over. |
887
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
269 // "guarded" is used for assertion checking below and recalls the fact |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
270 // that the would-be end of the new committed region would have |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
271 // penetrated the guard page. |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
272 HeapWord* new_end_for_commit = new_end_aligned; |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
273 |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
274 DEBUG_ONLY(bool guarded = false;) |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
275 if (new_end_for_commit > _guard_region.start()) { |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
276 new_end_for_commit = _guard_region.start(); |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
277 DEBUG_ONLY(guarded = true;) |
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
278 } |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
279 |
0 | 280 if (new_end_for_commit > cur_committed.end()) { |
281 // Must commit new pages. | |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
282 MemRegion const new_committed = |
0 | 283 MemRegion(cur_committed.end(), new_end_for_commit); |
284 | |
285 assert(!new_committed.is_empty(), "Region should not be empty here"); | |
286 if (!os::commit_memory((char*)new_committed.start(), | |
287 new_committed.byte_size(), _page_size)) { | |
288 // Do better than this for Merlin | |
289 vm_exit_out_of_memory(new_committed.byte_size(), | |
290 "card table expansion"); | |
291 } | |
292 // Use new_end_aligned (as opposed to new_end_for_commit) because | |
293 // the cur_committed region may include the guard region. | |
294 } else if (new_end_aligned < cur_committed.end()) { | |
295 // Must uncommit pages. | |
6
73e96e5c30df
6624765: Guarantee failure "Unexpected dirty card found"
jmasa
parents:
0
diff
changeset
|
296 MemRegion const uncommit_region = |
0 | 297 committed_unique_to_self(ind, MemRegion(new_end_aligned, |
298 cur_committed.end())); | |
299 if (!uncommit_region.is_empty()) { | |
1612
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
300 // It is not safe to uncommit cards if the boundary between |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
301 // the generations is moving. A shrink can uncommit cards |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
302 // owned by generation A but being used by generation B. |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
303 if (!UseAdaptiveGCBoundary) { |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
304 if (!os::uncommit_memory((char*)uncommit_region.start(), |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
305 uncommit_region.byte_size())) { |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
306 assert(false, "Card table contraction failed"); |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
307 // The call failed so don't change the end of the |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
308 // committed region. This is better than taking the |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
309 // VM down. |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
310 new_end_aligned = _committed[ind].end(); |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
311 } |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
312 } else { |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
313 new_end_aligned = _committed[ind].end(); |
0 | 314 } |
315 } | |
316 } | |
317 // In any case, we can reset the end of the current committed entry. | |
318 _committed[ind].set_end(new_end_aligned); | |
319 | |
1612
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
320 #ifdef ASSERT |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
321 // Check that the last card in the new region is committed according |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
322 // to the tables. |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
323 bool covered = false; |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
324 for (int cr = 0; cr < _cur_covered_regions; cr++) { |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
325 if (_committed[cr].contains(new_end - 1)) { |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
326 covered = true; |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
327 break; |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
328 } |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
329 } |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
330 assert(covered, "Card for end of new region not committed"); |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
331 #endif |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
332 |
0 | 333 // The default of 0 is not necessarily clean cards. |
334 jbyte* entry; | |
335 if (old_region.last() < _whole_heap.start()) { | |
336 entry = byte_for(_whole_heap.start()); | |
337 } else { | |
338 entry = byte_after(old_region.last()); | |
339 } | |
489
2494ab195856
6653214: MemoryPoolMXBean.setUsageThreshold() does not support large heap sizes.
swamyv
parents:
356
diff
changeset
|
340 assert(index_for(new_region.last()) < _guard_index, |
0 | 341 "The guard card will be overwritten"); |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
342 // This line commented out cleans the newly expanded region and |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
343 // not the aligned up expanded region. |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
344 // jbyte* const end = byte_after(new_region.last()); |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
345 jbyte* const end = (jbyte*) new_end_for_commit; |
887
ff004bcd2596
6843292: "Expect to be beyond new region unless impacting another region" assertion too strong
jmasa
parents:
628
diff
changeset
|
346 assert((end >= byte_after(new_region.last())) || collided || guarded, |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
347 "Expect to be beyond new region unless impacting another region"); |
0 | 348 // do nothing if we resized downward. |
208
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
349 #ifdef ASSERT |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
350 for (int ri = 0; ri < _cur_covered_regions; ri++) { |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
351 if (ri != ind) { |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
352 // The end of the new committed region should not |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
353 // be in any existing region unless it matches |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
354 // the start of the next region. |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
355 assert(!_committed[ri].contains(end) || |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
356 (_committed[ri].start() == (HeapWord*) end), |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
357 "Overlapping committed regions"); |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
358 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
359 } |
35ca13d63fe8
6688799: Second fix for Guarantee failure "Unexpected dirty card found"
jmasa
parents:
113
diff
changeset
|
360 #endif |
0 | 361 if (entry < end) { |
362 memset(entry, clean_card, pointer_delta(end, entry, sizeof(jbyte))); | |
363 } | |
364 } | |
365 // In any case, the covered size changes. | |
366 _covered[ind].set_word_size(new_region.word_size()); | |
367 if (TraceCardTableModRefBS) { | |
368 gclog_or_tty->print_cr("CardTableModRefBS::resize_covered_region: "); | |
369 gclog_or_tty->print_cr(" " | |
370 " _covered[%d].start(): " INTPTR_FORMAT | |
371 " _covered[%d].last(): " INTPTR_FORMAT, | |
372 ind, _covered[ind].start(), | |
373 ind, _covered[ind].last()); | |
374 gclog_or_tty->print_cr(" " | |
375 " _committed[%d].start(): " INTPTR_FORMAT | |
376 " _committed[%d].last(): " INTPTR_FORMAT, | |
377 ind, _committed[ind].start(), | |
378 ind, _committed[ind].last()); | |
379 gclog_or_tty->print_cr(" " | |
380 " byte_for(start): " INTPTR_FORMAT | |
381 " byte_for(last): " INTPTR_FORMAT, | |
382 byte_for(_covered[ind].start()), | |
383 byte_for(_covered[ind].last())); | |
384 gclog_or_tty->print_cr(" " | |
385 " addr_for(start): " INTPTR_FORMAT | |
386 " addr_for(last): " INTPTR_FORMAT, | |
387 addr_for((jbyte*) _committed[ind].start()), | |
388 addr_for((jbyte*) _committed[ind].last())); | |
389 } | |
1612
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
390 // Touch the last card of the covered region to show that it |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
391 // is committed (or SEGV). |
fdde661c8e06
6952853: SIGSEGV with UseAdaptiveGCBoundary on 64b linux running jvm2008
jmasa
parents:
1552
diff
changeset
|
392 debug_only(*byte_for(_covered[ind].last());) |
0 | 393 debug_only(verify_guard();) |
394 } | |
395 | |
396 // Note that these versions are precise! The scanning code has to handle the | |
397 // fact that the write barrier may be either precise or imprecise. | |
398 | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
46
diff
changeset
|
399 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal) { |
0 | 400 inline_write_ref_field(field, newVal); |
401 } | |
402 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
403 /* |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
404 Claimed and deferred bits are used together in G1 during the evacuation |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
405 pause. These bits can have the following state transitions: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
406 1. The claimed bit can be put over any other card state. Except that |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
407 the "dirty -> dirty and claimed" transition is checked for in |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
408 G1 code and is not used. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
409 2. Deferred bit can be set only if the previous state of the card |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
410 was either clean or claimed. mark_card_deferred() is wait-free. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
411 We do not care if the operation is be successful because if |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
412 it does not it will only result in duplicate entry in the update |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
413 buffer because of the "cache-miss". So it's not worth spinning. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
414 */ |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
415 |
0 | 416 |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
417 bool CardTableModRefBS::claim_card(size_t card_index) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
418 jbyte val = _byte_map[card_index]; |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
419 assert(val != dirty_card_val(), "Shouldn't claim a dirty card"); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
420 while (val == clean_card_val() || |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
421 (val & (clean_card_mask_val() | claimed_card_val())) != claimed_card_val()) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
422 jbyte new_val = val; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
423 if (val == clean_card_val()) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
424 new_val = (jbyte)claimed_card_val(); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
425 } else { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
426 new_val = val | (jbyte)claimed_card_val(); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
427 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
428 jbyte res = Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
429 if (res == val) { |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
430 return true; |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
431 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
432 val = res; |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
433 } |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
434 return false; |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
435 } |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
436 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
437 bool CardTableModRefBS::mark_card_deferred(size_t card_index) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
438 jbyte val = _byte_map[card_index]; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
439 // It's already processed |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
440 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
441 return false; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
442 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
443 // Cached bit can be installed either on a clean card or on a claimed card. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
444 jbyte new_val = val; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
445 if (val == clean_card_val()) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
446 new_val = (jbyte)deferred_card_val(); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
447 } else { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
448 if (val & claimed_card_val()) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
449 new_val = val | (jbyte)deferred_card_val(); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
450 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
451 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
452 if (new_val != val) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
453 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
454 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
455 return true; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
456 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
581
diff
changeset
|
457 |
3287
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
458 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp, |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
459 MemRegion mr, |
3357
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
460 OopsInGenClosure* cl, |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
461 CardTableRS* ct) { |
0 | 462 if (!mr.is_empty()) { |
463 int n_threads = SharedHeap::heap()->n_par_threads(); | |
464 if (n_threads > 0) { | |
465 #ifndef SERIALGC | |
3357
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
466 non_clean_card_iterate_parallel_work(sp, mr, cl, ct, n_threads); |
0 | 467 #else // SERIALGC |
468 fatal("Parallel gc not supported here."); | |
469 #endif // SERIALGC | |
470 } else { | |
3287
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
471 // We do not call the non_clean_card_iterate_serial() version below because |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
472 // we want to clear the cards (which non_clean_card_iterate_serial() does not |
3357
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
473 // do for us): clear_cl here does the work of finding contiguous dirty ranges |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
474 // of cards to process and clear. |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
475 |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
476 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
477 cl->gen_boundary()); |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
478 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct); |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
479 |
fc2b798ab316
6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
ysr
parents:
3317
diff
changeset
|
480 clear_cl.do_MemRegion(mr); |
0 | 481 } |
482 } | |
483 } | |
484 | |
3287
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
485 // The iterator itself is not MT-aware, but |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
486 // MT-aware callers and closures can use this to |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
487 // accomplish dirty card iteration in parallel. The |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
488 // iterator itself does not clear the dirty cards, or |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
489 // change their values in any manner. |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
490 void CardTableModRefBS::non_clean_card_iterate_serial(MemRegion mr, |
c48ad6ab8bdf
7037276: Unnecessary double traversal of dirty card windows
ysr
parents:
3256
diff
changeset
|
491 MemRegionClosure* cl) { |
0 | 492 for (int i = 0; i < _cur_covered_regions; i++) { |
493 MemRegion mri = mr.intersection(_covered[i]); | |
494 if (mri.word_size() > 0) { | |
495 jbyte* cur_entry = byte_for(mri.last()); | |
496 jbyte* limit = byte_for(mri.start()); | |
497 while (cur_entry >= limit) { | |
498 jbyte* next_entry = cur_entry - 1; | |
499 if (*cur_entry != clean_card) { | |
500 size_t non_clean_cards = 1; | |
501 // Should the next card be included in this range of dirty cards. | |
502 while (next_entry >= limit && *next_entry != clean_card) { | |
503 non_clean_cards++; | |
504 cur_entry = next_entry; | |
505 next_entry--; | |
506 } | |
507 // The memory region may not be on a card boundary. So that | |
508 // objects beyond the end of the region are not processed, make | |
509 // cur_cards precise with regard to the end of the memory region. | |
510 MemRegion cur_cards(addr_for(cur_entry), | |
511 non_clean_cards * card_size_in_words); | |
512 MemRegion dirty_region = cur_cards.intersection(mri); | |
513 cl->do_MemRegion(dirty_region); | |
514 } | |
515 cur_entry = next_entry; | |
516 } | |
517 } | |
518 } | |
519 } | |
520 | |
521 void CardTableModRefBS::dirty_MemRegion(MemRegion mr) { | |
1091
6aa7255741f3
6906727: UseCompressedOops: some card-marking fixes related to object arrays
ysr
parents:
940
diff
changeset
|
522 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
6aa7255741f3
6906727: UseCompressedOops: some card-marking fixes related to object arrays
ysr
parents:
940
diff
changeset
|
523 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 524 jbyte* cur = byte_for(mr.start()); |
525 jbyte* last = byte_after(mr.last()); | |
526 while (cur < last) { | |
527 *cur = dirty_card; | |
528 cur++; | |
529 } | |
530 } | |
531 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
532 void CardTableModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
1091
6aa7255741f3
6906727: UseCompressedOops: some card-marking fixes related to object arrays
ysr
parents:
940
diff
changeset
|
533 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
6aa7255741f3
6906727: UseCompressedOops: some card-marking fixes related to object arrays
ysr
parents:
940
diff
changeset
|
534 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 535 for (int i = 0; i < _cur_covered_regions; i++) { |
536 MemRegion mri = mr.intersection(_covered[i]); | |
537 if (!mri.is_empty()) dirty_MemRegion(mri); | |
538 } | |
539 } | |
540 | |
541 void CardTableModRefBS::clear_MemRegion(MemRegion mr) { | |
542 // Be conservative: only clean cards entirely contained within the | |
543 // region. | |
544 jbyte* cur; | |
545 if (mr.start() == _whole_heap.start()) { | |
546 cur = byte_for(mr.start()); | |
547 } else { | |
548 assert(mr.start() > _whole_heap.start(), "mr is not covered."); | |
549 cur = byte_after(mr.start() - 1); | |
550 } | |
551 jbyte* last = byte_after(mr.last()); | |
552 memset(cur, clean_card, pointer_delta(last, cur, sizeof(jbyte))); | |
553 } | |
554 | |
555 void CardTableModRefBS::clear(MemRegion mr) { | |
556 for (int i = 0; i < _cur_covered_regions; i++) { | |
557 MemRegion mri = mr.intersection(_covered[i]); | |
558 if (!mri.is_empty()) clear_MemRegion(mri); | |
559 } | |
560 } | |
561 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
562 void CardTableModRefBS::dirty(MemRegion mr) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
563 jbyte* first = byte_for(mr.start()); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
564 jbyte* last = byte_after(mr.last()); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
565 memset(first, dirty_card, last-first); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
566 } |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
567 |
3256
c69b1043dfb1
7036482: clear argument is redundant and unused in cardtable methods
ysr
parents:
1972
diff
changeset
|
568 // Unlike several other card table methods, dirty_card_iterate() |
c69b1043dfb1
7036482: clear argument is redundant and unused in cardtable methods
ysr
parents:
1972
diff
changeset
|
569 // iterates over dirty cards ranges in increasing address order. |
0 | 570 void CardTableModRefBS::dirty_card_iterate(MemRegion mr, |
571 MemRegionClosure* cl) { | |
572 for (int i = 0; i < _cur_covered_regions; i++) { | |
573 MemRegion mri = mr.intersection(_covered[i]); | |
574 if (!mri.is_empty()) { | |
575 jbyte *cur_entry, *next_entry, *limit; | |
576 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
577 cur_entry <= limit; | |
578 cur_entry = next_entry) { | |
579 next_entry = cur_entry + 1; | |
580 if (*cur_entry == dirty_card) { | |
581 size_t dirty_cards; | |
582 // Accumulate maximal dirty card range, starting at cur_entry | |
583 for (dirty_cards = 1; | |
584 next_entry <= limit && *next_entry == dirty_card; | |
585 dirty_cards++, next_entry++); | |
586 MemRegion cur_cards(addr_for(cur_entry), | |
587 dirty_cards*card_size_in_words); | |
588 cl->do_MemRegion(cur_cards); | |
589 } | |
590 } | |
591 } | |
592 } | |
593 } | |
594 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
595 MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr, |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
596 bool reset, |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
597 int reset_val) { |
0 | 598 for (int i = 0; i < _cur_covered_regions; i++) { |
599 MemRegion mri = mr.intersection(_covered[i]); | |
600 if (!mri.is_empty()) { | |
601 jbyte* cur_entry, *next_entry, *limit; | |
602 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
603 cur_entry <= limit; | |
604 cur_entry = next_entry) { | |
605 next_entry = cur_entry + 1; | |
606 if (*cur_entry == dirty_card) { | |
607 size_t dirty_cards; | |
608 // Accumulate maximal dirty card range, starting at cur_entry | |
609 for (dirty_cards = 1; | |
610 next_entry <= limit && *next_entry == dirty_card; | |
611 dirty_cards++, next_entry++); | |
612 MemRegion cur_cards(addr_for(cur_entry), | |
613 dirty_cards*card_size_in_words); | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
614 if (reset) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
615 for (size_t i = 0; i < dirty_cards; i++) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
616 cur_entry[i] = reset_val; |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
617 } |
0 | 618 } |
619 return cur_cards; | |
620 } | |
621 } | |
622 } | |
623 } | |
624 return MemRegion(mr.end(), mr.end()); | |
625 } | |
626 | |
627 // Set all the dirty cards in the given region to "precleaned" state. | |
628 void CardTableModRefBS::preclean_dirty_cards(MemRegion mr) { | |
629 for (int i = 0; i < _cur_covered_regions; i++) { | |
630 MemRegion mri = mr.intersection(_covered[i]); | |
631 if (!mri.is_empty()) { | |
632 jbyte *cur_entry, *limit; | |
633 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
634 cur_entry <= limit; | |
635 cur_entry++) { | |
636 if (*cur_entry == dirty_card) { | |
637 *cur_entry = precleaned_card; | |
638 } | |
639 } | |
640 } | |
641 } | |
642 } | |
643 | |
644 uintx CardTableModRefBS::ct_max_alignment_constraint() { | |
645 return card_size * os::vm_page_size(); | |
646 } | |
647 | |
648 void CardTableModRefBS::verify_guard() { | |
649 // For product build verification | |
650 guarantee(_byte_map[_guard_index] == last_card, | |
651 "card table guard has been modified"); | |
652 } | |
653 | |
654 void CardTableModRefBS::verify() { | |
655 verify_guard(); | |
656 } | |
657 | |
658 #ifndef PRODUCT | |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
659 void CardTableModRefBS::verify_region(MemRegion mr, |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
660 jbyte val, bool val_equals) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
661 jbyte* start = byte_for(mr.start()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
662 jbyte* end = byte_for(mr.last()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
663 bool failures = false; |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
664 for (jbyte* curr = start; curr <= end; ++curr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
665 jbyte curr_val = *curr; |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
666 bool failed = (val_equals) ? (curr_val != val) : (curr_val == val); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
667 if (failed) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
668 if (!failures) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
669 tty->cr(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
670 tty->print_cr("== CT verification failed: ["PTR_FORMAT","PTR_FORMAT"]"); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
671 tty->print_cr("== %sexpecting value: %d", |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
672 (val_equals) ? "" : "not ", val); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
673 failures = true; |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
674 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
675 tty->print_cr("== card "PTR_FORMAT" ["PTR_FORMAT","PTR_FORMAT"], " |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
676 "val: %d", curr, addr_for(curr), |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
677 (HeapWord*) (((size_t) addr_for(curr)) + card_size), |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
678 (int) curr_val); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
679 } |
0 | 680 } |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
681 guarantee(!failures, "there should not have been any failures"); |
0 | 682 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
887
diff
changeset
|
683 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
684 void CardTableModRefBS::verify_not_dirty_region(MemRegion mr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
685 verify_region(mr, dirty_card, false /* val_equals */); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
686 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
887
diff
changeset
|
687 |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
887
diff
changeset
|
688 void CardTableModRefBS::verify_dirty_region(MemRegion mr) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3287
diff
changeset
|
689 verify_region(mr, dirty_card, true /* val_equals */); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
887
diff
changeset
|
690 } |
0 | 691 #endif |
692 | |
693 bool CardTableModRefBSForCTRS::card_will_be_scanned(jbyte cv) { | |
694 return | |
695 CardTableModRefBS::card_will_be_scanned(cv) || | |
696 _rs->is_prev_nonclean_card_val(cv); | |
697 }; | |
698 | |
699 bool CardTableModRefBSForCTRS::card_may_have_been_dirty(jbyte cv) { | |
700 return | |
701 cv != clean_card && | |
702 (CardTableModRefBS::card_may_have_been_dirty(cv) || | |
703 CardTableRS::youngergen_may_have_been_dirty(cv)); | |
704 }; |