Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.cpp @ 3109:3664989976e2
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author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Fri, 01 Jul 2011 12:57:10 +0200 |
parents | f95d63e2154a |
children | c69b1043dfb1 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 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 * | |
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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 "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
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212 // collided is true if the expansion would push into another committed region |
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213 debug_only(bool collided = false;) |
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214 int const ind = find_covering_region_by_base(new_region.start()); |
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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. | |
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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). | |
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228 jbyte* const new_end = byte_after(new_region.last()); |
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229 HeapWord* new_end_aligned = |
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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"); | |
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233 // Check the other regions (excludes "ind") to ensure that |
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234 // the new_end_aligned does not intrude onto the committed |
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235 // space of another region. |
208
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236 int ri = 0; |
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237 for (ri = 0; ri < _cur_covered_regions; ri++) { |
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238 if (ri != ind) { |
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239 if (_committed[ri].contains(new_end_aligned)) { |
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240 // The prior check included in the assert |
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241 // (new_end_aligned >= _committed[ri].start()) |
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242 // is redundant with the "contains" test. |
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243 // Any region containing the new end |
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244 // should start at or beyond the region found (ind) |
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245 // for the new end (committed regions are not expected to |
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246 // be proper subsets of other committed regions). |
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247 assert(_committed[ri].start() >= _committed[ind].start(), |
208
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248 "New end of committed region is inconsistent"); |
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249 new_end_aligned = _committed[ri].start(); |
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250 // new_end_aligned can be equal to the start of its |
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251 // committed region (i.e., of "ind") if a second |
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252 // region following "ind" also start at the same location |
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253 // as "ind". |
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254 assert(new_end_aligned >= _committed[ind].start(), |
208
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255 "New end of committed region is before start"); |
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256 debug_only(collided = true;) |
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257 // Should only collide with 1 region |
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258 break; |
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259 } |
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260 } |
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261 } |
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262 #ifdef ASSERT |
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263 for (++ri; ri < _cur_covered_regions; ri++) { |
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264 assert(!_committed[ri].contains(new_end_aligned), |
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265 "New end of committed region is in a second committed region"); |
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266 } |
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267 #endif |
0 | 268 // The guard page is always committed and should not be committed over. |
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269 // "guarded" is used for assertion checking below and recalls the fact |
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270 // that the would-be end of the new committed region would have |
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271 // penetrated the guard page. |
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272 HeapWord* new_end_for_commit = new_end_aligned; |
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273 |
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274 DEBUG_ONLY(bool guarded = false;) |
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275 if (new_end_for_commit > _guard_region.start()) { |
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276 new_end_for_commit = _guard_region.start(); |
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277 DEBUG_ONLY(guarded = true;) |
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278 } |
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279 |
0 | 280 if (new_end_for_commit > cur_committed.end()) { |
281 // Must commit new pages. | |
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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. | |
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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()) { | |
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300 // It is not safe to uncommit cards if the boundary between |
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301 // the generations is moving. A shrink can uncommit cards |
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302 // owned by generation A but being used by generation B. |
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303 if (!UseAdaptiveGCBoundary) { |
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304 if (!os::uncommit_memory((char*)uncommit_region.start(), |
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305 uncommit_region.byte_size())) { |
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306 assert(false, "Card table contraction failed"); |
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307 // The call failed so don't change the end of the |
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308 // committed region. This is better than taking the |
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309 // VM down. |
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310 new_end_aligned = _committed[ind].end(); |
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311 } |
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312 } else { |
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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 | |
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320 #ifdef ASSERT |
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321 // Check that the last card in the new region is committed according |
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322 // to the tables. |
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323 bool covered = false; |
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324 for (int cr = 0; cr < _cur_covered_regions; cr++) { |
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325 if (_committed[cr].contains(new_end - 1)) { |
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326 covered = true; |
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327 break; |
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328 } |
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329 } |
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330 assert(covered, "Card for end of new region not committed"); |
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331 #endif |
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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
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340 assert(index_for(new_region.last()) < _guard_index, |
0 | 341 "The guard card will be overwritten"); |
208
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342 // This line commented out cleans the newly expanded region and |
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343 // not the aligned up expanded region. |
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344 // jbyte* const end = byte_after(new_region.last()); |
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345 jbyte* const end = (jbyte*) new_end_for_commit; |
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346 assert((end >= byte_after(new_region.last())) || collided || guarded, |
208
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347 "Expect to be beyond new region unless impacting another region"); |
0 | 348 // do nothing if we resized downward. |
208
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349 #ifdef ASSERT |
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350 for (int ri = 0; ri < _cur_covered_regions; ri++) { |
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351 if (ri != ind) { |
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352 // The end of the new committed region should not |
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353 // be in any existing region unless it matches |
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354 // the start of the next region. |
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355 assert(!_committed[ri].contains(end) || |
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356 (_committed[ri].start() == (HeapWord*) end), |
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357 "Overlapping committed regions"); |
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358 } |
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359 } |
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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 } | |
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390 // Touch the last card of the covered region to show that it |
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391 // is committed (or SEGV). |
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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 | |
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399 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal) { |
0 | 400 inline_write_ref_field(field, newVal); |
401 } | |
402 | |
616
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403 /* |
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404 Claimed and deferred bits are used together in G1 during the evacuation |
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405 pause. These bits can have the following state transitions: |
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406 1. The claimed bit can be put over any other card state. Except that |
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407 the "dirty -> dirty and claimed" transition is checked for in |
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408 G1 code and is not used. |
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409 2. Deferred bit can be set only if the previous state of the card |
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410 was either clean or claimed. mark_card_deferred() is wait-free. |
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411 We do not care if the operation is be successful because if |
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412 it does not it will only result in duplicate entry in the update |
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413 buffer because of the "cache-miss". So it's not worth spinning. |
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414 */ |
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415 |
0 | 416 |
342
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417 bool CardTableModRefBS::claim_card(size_t card_index) { |
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418 jbyte val = _byte_map[card_index]; |
616
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419 assert(val != dirty_card_val(), "Shouldn't claim a dirty card"); |
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420 while (val == clean_card_val() || |
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421 (val & (clean_card_mask_val() | claimed_card_val())) != claimed_card_val()) { |
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422 jbyte new_val = val; |
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423 if (val == clean_card_val()) { |
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424 new_val = (jbyte)claimed_card_val(); |
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425 } else { |
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426 new_val = val | (jbyte)claimed_card_val(); |
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427 } |
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428 jbyte res = Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
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429 if (res == val) { |
342
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430 return true; |
616
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431 } |
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432 val = res; |
342
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433 } |
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434 return false; |
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435 } |
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436 |
616
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437 bool CardTableModRefBS::mark_card_deferred(size_t card_index) { |
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438 jbyte val = _byte_map[card_index]; |
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439 // It's already processed |
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440 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
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441 return false; |
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442 } |
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443 // Cached bit can be installed either on a clean card or on a claimed card. |
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444 jbyte new_val = val; |
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445 if (val == clean_card_val()) { |
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446 new_val = (jbyte)deferred_card_val(); |
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447 } else { |
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448 if (val & claimed_card_val()) { |
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449 new_val = val | (jbyte)deferred_card_val(); |
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450 } |
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451 } |
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452 if (new_val != val) { |
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453 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
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454 } |
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455 return true; |
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456 } |
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457 |
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458 |
0 | 459 void CardTableModRefBS::non_clean_card_iterate(Space* sp, |
460 MemRegion mr, | |
461 DirtyCardToOopClosure* dcto_cl, | |
462 MemRegionClosure* cl, | |
463 bool clear) { | |
464 if (!mr.is_empty()) { | |
465 int n_threads = SharedHeap::heap()->n_par_threads(); | |
466 if (n_threads > 0) { | |
467 #ifndef SERIALGC | |
468 par_non_clean_card_iterate_work(sp, mr, dcto_cl, cl, clear, n_threads); | |
469 #else // SERIALGC | |
470 fatal("Parallel gc not supported here."); | |
471 #endif // SERIALGC | |
472 } else { | |
473 non_clean_card_iterate_work(mr, cl, clear); | |
474 } | |
475 } | |
476 } | |
477 | |
478 // NOTE: For this to work correctly, it is important that | |
479 // we look for non-clean cards below (so as to catch those | |
480 // marked precleaned), rather than look explicitly for dirty | |
481 // cards (and miss those marked precleaned). In that sense, | |
482 // the name precleaned is currently somewhat of a misnomer. | |
483 void CardTableModRefBS::non_clean_card_iterate_work(MemRegion mr, | |
484 MemRegionClosure* cl, | |
485 bool clear) { | |
486 // Figure out whether we have to worry about parallelism. | |
487 bool is_par = (SharedHeap::heap()->n_par_threads() > 1); | |
488 for (int i = 0; i < _cur_covered_regions; i++) { | |
489 MemRegion mri = mr.intersection(_covered[i]); | |
490 if (mri.word_size() > 0) { | |
491 jbyte* cur_entry = byte_for(mri.last()); | |
492 jbyte* limit = byte_for(mri.start()); | |
493 while (cur_entry >= limit) { | |
494 jbyte* next_entry = cur_entry - 1; | |
495 if (*cur_entry != clean_card) { | |
496 size_t non_clean_cards = 1; | |
497 // Should the next card be included in this range of dirty cards. | |
498 while (next_entry >= limit && *next_entry != clean_card) { | |
499 non_clean_cards++; | |
500 cur_entry = next_entry; | |
501 next_entry--; | |
502 } | |
503 // The memory region may not be on a card boundary. So that | |
504 // objects beyond the end of the region are not processed, make | |
505 // cur_cards precise with regard to the end of the memory region. | |
506 MemRegion cur_cards(addr_for(cur_entry), | |
507 non_clean_cards * card_size_in_words); | |
508 MemRegion dirty_region = cur_cards.intersection(mri); | |
509 if (clear) { | |
510 for (size_t i = 0; i < non_clean_cards; i++) { | |
511 // Clean the dirty cards (but leave the other non-clean | |
512 // alone.) If parallel, do the cleaning atomically. | |
513 jbyte cur_entry_val = cur_entry[i]; | |
514 if (card_is_dirty_wrt_gen_iter(cur_entry_val)) { | |
515 if (is_par) { | |
516 jbyte res = Atomic::cmpxchg(clean_card, &cur_entry[i], cur_entry_val); | |
517 assert(res != clean_card, | |
518 "Dirty card mysteriously cleaned"); | |
519 } else { | |
520 cur_entry[i] = clean_card; | |
521 } | |
522 } | |
523 } | |
524 } | |
525 cl->do_MemRegion(dirty_region); | |
526 } | |
527 cur_entry = next_entry; | |
528 } | |
529 } | |
530 } | |
531 } | |
532 | |
533 void CardTableModRefBS::mod_oop_in_space_iterate(Space* sp, | |
534 OopClosure* cl, | |
535 bool clear, | |
536 bool before_save_marks) { | |
537 // Note that dcto_cl is resource-allocated, so there is no | |
538 // corresponding "delete". | |
539 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision()); | |
540 MemRegion used_mr; | |
541 if (before_save_marks) { | |
542 used_mr = sp->used_region_at_save_marks(); | |
543 } else { | |
544 used_mr = sp->used_region(); | |
545 } | |
546 non_clean_card_iterate(sp, used_mr, dcto_cl, dcto_cl, clear); | |
547 } | |
548 | |
549 void CardTableModRefBS::dirty_MemRegion(MemRegion mr) { | |
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550 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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551 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 552 jbyte* cur = byte_for(mr.start()); |
553 jbyte* last = byte_after(mr.last()); | |
554 while (cur < last) { | |
555 *cur = dirty_card; | |
556 cur++; | |
557 } | |
558 } | |
559 | |
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560 void CardTableModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
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561 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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562 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 563 for (int i = 0; i < _cur_covered_regions; i++) { |
564 MemRegion mri = mr.intersection(_covered[i]); | |
565 if (!mri.is_empty()) dirty_MemRegion(mri); | |
566 } | |
567 } | |
568 | |
569 void CardTableModRefBS::clear_MemRegion(MemRegion mr) { | |
570 // Be conservative: only clean cards entirely contained within the | |
571 // region. | |
572 jbyte* cur; | |
573 if (mr.start() == _whole_heap.start()) { | |
574 cur = byte_for(mr.start()); | |
575 } else { | |
576 assert(mr.start() > _whole_heap.start(), "mr is not covered."); | |
577 cur = byte_after(mr.start() - 1); | |
578 } | |
579 jbyte* last = byte_after(mr.last()); | |
580 memset(cur, clean_card, pointer_delta(last, cur, sizeof(jbyte))); | |
581 } | |
582 | |
583 void CardTableModRefBS::clear(MemRegion mr) { | |
584 for (int i = 0; i < _cur_covered_regions; i++) { | |
585 MemRegion mri = mr.intersection(_covered[i]); | |
586 if (!mri.is_empty()) clear_MemRegion(mri); | |
587 } | |
588 } | |
589 | |
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590 void CardTableModRefBS::dirty(MemRegion mr) { |
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591 jbyte* first = byte_for(mr.start()); |
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592 jbyte* last = byte_after(mr.last()); |
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593 memset(first, dirty_card, last-first); |
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594 } |
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595 |
0 | 596 // NOTES: |
597 // (1) Unlike mod_oop_in_space_iterate() above, dirty_card_iterate() | |
598 // iterates over dirty cards ranges in increasing address order. | |
599 void CardTableModRefBS::dirty_card_iterate(MemRegion mr, | |
600 MemRegionClosure* cl) { | |
601 for (int i = 0; i < _cur_covered_regions; i++) { | |
602 MemRegion mri = mr.intersection(_covered[i]); | |
603 if (!mri.is_empty()) { | |
604 jbyte *cur_entry, *next_entry, *limit; | |
605 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
606 cur_entry <= limit; | |
607 cur_entry = next_entry) { | |
608 next_entry = cur_entry + 1; | |
609 if (*cur_entry == dirty_card) { | |
610 size_t dirty_cards; | |
611 // Accumulate maximal dirty card range, starting at cur_entry | |
612 for (dirty_cards = 1; | |
613 next_entry <= limit && *next_entry == dirty_card; | |
614 dirty_cards++, next_entry++); | |
615 MemRegion cur_cards(addr_for(cur_entry), | |
616 dirty_cards*card_size_in_words); | |
617 cl->do_MemRegion(cur_cards); | |
618 } | |
619 } | |
620 } | |
621 } | |
622 } | |
623 | |
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624 MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr, |
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625 bool reset, |
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626 int reset_val) { |
0 | 627 for (int i = 0; i < _cur_covered_regions; i++) { |
628 MemRegion mri = mr.intersection(_covered[i]); | |
629 if (!mri.is_empty()) { | |
630 jbyte* cur_entry, *next_entry, *limit; | |
631 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
632 cur_entry <= limit; | |
633 cur_entry = next_entry) { | |
634 next_entry = cur_entry + 1; | |
635 if (*cur_entry == dirty_card) { | |
636 size_t dirty_cards; | |
637 // Accumulate maximal dirty card range, starting at cur_entry | |
638 for (dirty_cards = 1; | |
639 next_entry <= limit && *next_entry == dirty_card; | |
640 dirty_cards++, next_entry++); | |
641 MemRegion cur_cards(addr_for(cur_entry), | |
642 dirty_cards*card_size_in_words); | |
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643 if (reset) { |
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644 for (size_t i = 0; i < dirty_cards; i++) { |
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645 cur_entry[i] = reset_val; |
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646 } |
0 | 647 } |
648 return cur_cards; | |
649 } | |
650 } | |
651 } | |
652 } | |
653 return MemRegion(mr.end(), mr.end()); | |
654 } | |
655 | |
656 // Set all the dirty cards in the given region to "precleaned" state. | |
657 void CardTableModRefBS::preclean_dirty_cards(MemRegion mr) { | |
658 for (int i = 0; i < _cur_covered_regions; i++) { | |
659 MemRegion mri = mr.intersection(_covered[i]); | |
660 if (!mri.is_empty()) { | |
661 jbyte *cur_entry, *limit; | |
662 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
663 cur_entry <= limit; | |
664 cur_entry++) { | |
665 if (*cur_entry == dirty_card) { | |
666 *cur_entry = precleaned_card; | |
667 } | |
668 } | |
669 } | |
670 } | |
671 } | |
672 | |
673 uintx CardTableModRefBS::ct_max_alignment_constraint() { | |
674 return card_size * os::vm_page_size(); | |
675 } | |
676 | |
677 void CardTableModRefBS::verify_guard() { | |
678 // For product build verification | |
679 guarantee(_byte_map[_guard_index] == last_card, | |
680 "card table guard has been modified"); | |
681 } | |
682 | |
683 void CardTableModRefBS::verify() { | |
684 verify_guard(); | |
685 } | |
686 | |
687 #ifndef PRODUCT | |
688 class GuaranteeNotModClosure: public MemRegionClosure { | |
689 CardTableModRefBS* _ct; | |
690 public: | |
691 GuaranteeNotModClosure(CardTableModRefBS* ct) : _ct(ct) {} | |
692 void do_MemRegion(MemRegion mr) { | |
693 jbyte* entry = _ct->byte_for(mr.start()); | |
694 guarantee(*entry != CardTableModRefBS::clean_card, | |
695 "Dirty card in region that should be clean"); | |
696 } | |
697 }; | |
698 | |
699 void CardTableModRefBS::verify_clean_region(MemRegion mr) { | |
700 GuaranteeNotModClosure blk(this); | |
701 non_clean_card_iterate_work(mr, &blk, false); | |
702 } | |
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703 |
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704 // To verify a MemRegion is entirely dirty this closure is passed to |
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705 // dirty_card_iterate. If the region is dirty do_MemRegion will be |
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706 // invoked only once with a MemRegion equal to the one being |
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707 // verified. |
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708 class GuaranteeDirtyClosure: public MemRegionClosure { |
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709 CardTableModRefBS* _ct; |
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710 MemRegion _mr; |
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711 bool _result; |
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712 public: |
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713 GuaranteeDirtyClosure(CardTableModRefBS* ct, MemRegion mr) |
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714 : _ct(ct), _mr(mr), _result(false) {} |
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715 void do_MemRegion(MemRegion mr) { |
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716 _result = _mr.equals(mr); |
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717 } |
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718 bool result() const { return _result; } |
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719 }; |
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720 |
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721 void CardTableModRefBS::verify_dirty_region(MemRegion mr) { |
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722 GuaranteeDirtyClosure blk(this, mr); |
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723 dirty_card_iterate(mr, &blk); |
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724 guarantee(blk.result(), "Non-dirty cards in region that should be dirty"); |
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725 } |
0 | 726 #endif |
727 | |
728 bool CardTableModRefBSForCTRS::card_will_be_scanned(jbyte cv) { | |
729 return | |
730 CardTableModRefBS::card_will_be_scanned(cv) || | |
731 _rs->is_prev_nonclean_card_val(cv); | |
732 }; | |
733 | |
734 bool CardTableModRefBSForCTRS::card_may_have_been_dirty(jbyte cv) { | |
735 return | |
736 cv != clean_card && | |
737 (CardTableModRefBS::card_may_have_been_dirty(cv) || | |
738 CardTableRS::youngergen_may_have_been_dirty(cv)); | |
739 }; |