Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.cpp @ 10334:7c5a1b62f53d
8014971: Minor code cleanup of the freelist management
Reviewed-by: jwilhelm, jmasa, tschatzl
author | brutisso |
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date | Wed, 22 May 2013 08:04:58 +0200 |
parents | f9be75d21404 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "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" | |
6197 | 36 #include "services/memTracker.hpp" |
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37 #include "utilities/macros.hpp" |
1972 | 38 #ifdef COMPILER1 |
39 #include "c1/c1_LIR.hpp" | |
40 #include "c1/c1_LIRGenerator.hpp" | |
41 #endif | |
42 | |
0 | 43 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
44 // enumerate ref fields that have been modified (since the last | |
45 // enumeration.) | |
46 | |
47 size_t CardTableModRefBS::cards_required(size_t covered_words) | |
48 { | |
49 // Add one for a guard card, used to detect errors. | |
50 const size_t words = align_size_up(covered_words, card_size_in_words); | |
51 return words / card_size_in_words + 1; | |
52 } | |
53 | |
54 size_t CardTableModRefBS::compute_byte_map_size() | |
55 { | |
56 assert(_guard_index == cards_required(_whole_heap.word_size()) - 1, | |
57 "unitialized, check declaration order"); | |
58 assert(_page_size != 0, "unitialized, check declaration order"); | |
59 const size_t granularity = os::vm_allocation_granularity(); | |
60 return align_size_up(_guard_index + 1, MAX2(_page_size, granularity)); | |
61 } | |
62 | |
63 CardTableModRefBS::CardTableModRefBS(MemRegion whole_heap, | |
64 int max_covered_regions): | |
65 ModRefBarrierSet(max_covered_regions), | |
66 _whole_heap(whole_heap), | |
67 _guard_index(cards_required(whole_heap.word_size()) - 1), | |
68 _last_valid_index(_guard_index - 1), | |
21 | 69 _page_size(os::vm_page_size()), |
0 | 70 _byte_map_size(compute_byte_map_size()) |
71 { | |
72 _kind = BarrierSet::CardTableModRef; | |
73 | |
74 HeapWord* low_bound = _whole_heap.start(); | |
75 HeapWord* high_bound = _whole_heap.end(); | |
76 assert((uintptr_t(low_bound) & (card_size - 1)) == 0, "heap must start at card boundary"); | |
77 assert((uintptr_t(high_bound) & (card_size - 1)) == 0, "heap must end at card boundary"); | |
78 | |
79 assert(card_size <= 512, "card_size must be less than 512"); // why? | |
80 | |
10135 | 81 _covered = new MemRegion[max_covered_regions]; |
82 _committed = new MemRegion[max_covered_regions]; | |
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83 if (_covered == NULL || _committed == NULL) { |
0 | 84 vm_exit_during_initialization("couldn't alloc card table covered region set."); |
85 } | |
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86 |
10135 | 87 _cur_covered_regions = 0; |
0 | 88 const size_t rs_align = _page_size == (size_t) os::vm_page_size() ? 0 : |
89 MAX2(_page_size, (size_t) os::vm_allocation_granularity()); | |
90 ReservedSpace heap_rs(_byte_map_size, rs_align, false); | |
6197 | 91 |
92 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtGC); | |
93 | |
0 | 94 os::trace_page_sizes("card table", _guard_index + 1, _guard_index + 1, |
95 _page_size, heap_rs.base(), heap_rs.size()); | |
96 if (!heap_rs.is_reserved()) { | |
97 vm_exit_during_initialization("Could not reserve enough space for the " | |
98 "card marking array"); | |
99 } | |
100 | |
101 // The assember store_check code will do an unsigned shift of the oop, | |
102 // then add it to byte_map_base, i.e. | |
103 // | |
104 // _byte_map = byte_map_base + (uintptr_t(low_bound) >> card_shift) | |
105 _byte_map = (jbyte*) heap_rs.base(); | |
106 byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); | |
107 assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map"); | |
108 assert(byte_for(high_bound-1) <= &_byte_map[_last_valid_index], "Checking end of map"); | |
109 | |
110 jbyte* guard_card = &_byte_map[_guard_index]; | |
111 uintptr_t guard_page = align_size_down((uintptr_t)guard_card, _page_size); | |
112 _guard_region = MemRegion((HeapWord*)guard_page, _page_size); | |
113 if (!os::commit_memory((char*)guard_page, _page_size, _page_size)) { | |
114 // Do better than this for Merlin | |
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115 vm_exit_out_of_memory(_page_size, OOM_MMAP_ERROR, "card table last card"); |
0 | 116 } |
6197 | 117 |
0 | 118 *guard_card = last_card; |
119 | |
120 _lowest_non_clean = | |
6197 | 121 NEW_C_HEAP_ARRAY(CardArr, max_covered_regions, mtGC); |
0 | 122 _lowest_non_clean_chunk_size = |
6197 | 123 NEW_C_HEAP_ARRAY(size_t, max_covered_regions, mtGC); |
0 | 124 _lowest_non_clean_base_chunk_index = |
6197 | 125 NEW_C_HEAP_ARRAY(uintptr_t, max_covered_regions, mtGC); |
0 | 126 _last_LNC_resizing_collection = |
6197 | 127 NEW_C_HEAP_ARRAY(int, max_covered_regions, mtGC); |
0 | 128 if (_lowest_non_clean == NULL |
129 || _lowest_non_clean_chunk_size == NULL | |
130 || _lowest_non_clean_base_chunk_index == NULL | |
131 || _last_LNC_resizing_collection == NULL) | |
132 vm_exit_during_initialization("couldn't allocate an LNC array."); | |
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133 for (int i = 0; i < max_covered_regions; i++) { |
0 | 134 _lowest_non_clean[i] = NULL; |
135 _lowest_non_clean_chunk_size[i] = 0; | |
136 _last_LNC_resizing_collection[i] = -1; | |
137 } | |
138 | |
139 if (TraceCardTableModRefBS) { | |
140 gclog_or_tty->print_cr("CardTableModRefBS::CardTableModRefBS: "); | |
141 gclog_or_tty->print_cr(" " | |
142 " &_byte_map[0]: " INTPTR_FORMAT | |
143 " &_byte_map[_last_valid_index]: " INTPTR_FORMAT, | |
144 &_byte_map[0], | |
145 &_byte_map[_last_valid_index]); | |
146 gclog_or_tty->print_cr(" " | |
147 " byte_map_base: " INTPTR_FORMAT, | |
148 byte_map_base); | |
149 } | |
150 } | |
151 | |
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152 CardTableModRefBS::~CardTableModRefBS() { |
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153 if (_covered) { |
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154 delete[] _covered; |
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155 _covered = NULL; |
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156 } |
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157 if (_committed) { |
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158 delete[] _committed; |
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159 _committed = NULL; |
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160 } |
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161 if (_lowest_non_clean) { |
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162 FREE_C_HEAP_ARRAY(CardArr, _lowest_non_clean, mtGC); |
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163 _lowest_non_clean = NULL; |
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164 } |
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165 if (_lowest_non_clean_chunk_size) { |
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166 FREE_C_HEAP_ARRAY(size_t, _lowest_non_clean_chunk_size, mtGC); |
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167 _lowest_non_clean_chunk_size = NULL; |
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168 } |
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169 if (_lowest_non_clean_base_chunk_index) { |
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170 FREE_C_HEAP_ARRAY(uintptr_t, _lowest_non_clean_base_chunk_index, mtGC); |
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171 _lowest_non_clean_base_chunk_index = NULL; |
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172 } |
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173 if (_last_LNC_resizing_collection) { |
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174 FREE_C_HEAP_ARRAY(int, _last_LNC_resizing_collection, mtGC); |
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175 _last_LNC_resizing_collection = NULL; |
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176 } |
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177 } |
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178 |
0 | 179 int CardTableModRefBS::find_covering_region_by_base(HeapWord* base) { |
180 int i; | |
181 for (i = 0; i < _cur_covered_regions; i++) { | |
182 if (_covered[i].start() == base) return i; | |
183 if (_covered[i].start() > base) break; | |
184 } | |
185 // If we didn't find it, create a new one. | |
186 assert(_cur_covered_regions < _max_covered_regions, | |
187 "too many covered regions"); | |
188 // Move the ones above up, to maintain sorted order. | |
189 for (int j = _cur_covered_regions; j > i; j--) { | |
190 _covered[j] = _covered[j-1]; | |
191 _committed[j] = _committed[j-1]; | |
192 } | |
193 int res = i; | |
194 _cur_covered_regions++; | |
195 _covered[res].set_start(base); | |
196 _covered[res].set_word_size(0); | |
197 jbyte* ct_start = byte_for(base); | |
198 uintptr_t ct_start_aligned = align_size_down((uintptr_t)ct_start, _page_size); | |
199 _committed[res].set_start((HeapWord*)ct_start_aligned); | |
200 _committed[res].set_word_size(0); | |
201 return res; | |
202 } | |
203 | |
204 int CardTableModRefBS::find_covering_region_containing(HeapWord* addr) { | |
205 for (int i = 0; i < _cur_covered_regions; i++) { | |
206 if (_covered[i].contains(addr)) { | |
207 return i; | |
208 } | |
209 } | |
210 assert(0, "address outside of heap?"); | |
211 return -1; | |
212 } | |
213 | |
214 HeapWord* CardTableModRefBS::largest_prev_committed_end(int ind) const { | |
215 HeapWord* max_end = NULL; | |
216 for (int j = 0; j < ind; j++) { | |
217 HeapWord* this_end = _committed[j].end(); | |
218 if (this_end > max_end) max_end = this_end; | |
219 } | |
220 return max_end; | |
221 } | |
222 | |
223 MemRegion CardTableModRefBS::committed_unique_to_self(int self, | |
224 MemRegion mr) const { | |
225 MemRegion result = mr; | |
226 for (int r = 0; r < _cur_covered_regions; r += 1) { | |
227 if (r != self) { | |
228 result = result.minus(_committed[r]); | |
229 } | |
230 } | |
231 // Never include the guard page. | |
232 result = result.minus(_guard_region); | |
233 return result; | |
234 } | |
235 | |
236 void CardTableModRefBS::resize_covered_region(MemRegion new_region) { | |
237 // We don't change the start of a region, only the end. | |
238 assert(_whole_heap.contains(new_region), | |
239 "attempt to cover area not in reserved area"); | |
240 debug_only(verify_guard();) | |
208
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241 // collided is true if the expansion would push into another committed region |
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242 debug_only(bool collided = false;) |
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243 int const ind = find_covering_region_by_base(new_region.start()); |
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244 MemRegion const old_region = _covered[ind]; |
0 | 245 assert(old_region.start() == new_region.start(), "just checking"); |
246 if (new_region.word_size() != old_region.word_size()) { | |
247 // Commit new or uncommit old pages, if necessary. | |
248 MemRegion cur_committed = _committed[ind]; | |
249 // Extend the end of this _commited region | |
250 // to cover the end of any lower _committed regions. | |
251 // This forms overlapping regions, but never interior regions. | |
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252 HeapWord* const max_prev_end = largest_prev_committed_end(ind); |
0 | 253 if (max_prev_end > cur_committed.end()) { |
254 cur_committed.set_end(max_prev_end); | |
255 } | |
256 // Align the end up to a page size (starts are already aligned). | |
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257 jbyte* const new_end = byte_after(new_region.last()); |
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258 HeapWord* new_end_aligned = |
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259 (HeapWord*) align_size_up((uintptr_t)new_end, _page_size); |
0 | 260 assert(new_end_aligned >= (HeapWord*) new_end, |
261 "align up, but less"); | |
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262 // Check the other regions (excludes "ind") to ensure that |
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263 // the new_end_aligned does not intrude onto the committed |
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264 // space of another region. |
208
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265 int ri = 0; |
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266 for (ri = 0; ri < _cur_covered_regions; ri++) { |
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267 if (ri != ind) { |
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268 if (_committed[ri].contains(new_end_aligned)) { |
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269 // The prior check included in the assert |
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270 // (new_end_aligned >= _committed[ri].start()) |
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271 // is redundant with the "contains" test. |
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272 // Any region containing the new end |
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273 // should start at or beyond the region found (ind) |
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274 // for the new end (committed regions are not expected to |
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275 // be proper subsets of other committed regions). |
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276 assert(_committed[ri].start() >= _committed[ind].start(), |
208
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277 "New end of committed region is inconsistent"); |
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278 new_end_aligned = _committed[ri].start(); |
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279 // new_end_aligned can be equal to the start of its |
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280 // committed region (i.e., of "ind") if a second |
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281 // region following "ind" also start at the same location |
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282 // as "ind". |
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283 assert(new_end_aligned >= _committed[ind].start(), |
208
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284 "New end of committed region is before start"); |
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285 debug_only(collided = true;) |
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286 // Should only collide with 1 region |
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287 break; |
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288 } |
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289 } |
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290 } |
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291 #ifdef ASSERT |
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292 for (++ri; ri < _cur_covered_regions; ri++) { |
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293 assert(!_committed[ri].contains(new_end_aligned), |
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294 "New end of committed region is in a second committed region"); |
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295 } |
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296 #endif |
0 | 297 // The guard page is always committed and should not be committed over. |
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298 // "guarded" is used for assertion checking below and recalls the fact |
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299 // that the would-be end of the new committed region would have |
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300 // penetrated the guard page. |
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301 HeapWord* new_end_for_commit = new_end_aligned; |
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302 |
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303 DEBUG_ONLY(bool guarded = false;) |
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304 if (new_end_for_commit > _guard_region.start()) { |
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305 new_end_for_commit = _guard_region.start(); |
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306 DEBUG_ONLY(guarded = true;) |
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307 } |
208
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308 |
0 | 309 if (new_end_for_commit > cur_committed.end()) { |
310 // Must commit new pages. | |
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311 MemRegion const new_committed = |
0 | 312 MemRegion(cur_committed.end(), new_end_for_commit); |
313 | |
314 assert(!new_committed.is_empty(), "Region should not be empty here"); | |
315 if (!os::commit_memory((char*)new_committed.start(), | |
316 new_committed.byte_size(), _page_size)) { | |
317 // Do better than this for Merlin | |
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318 vm_exit_out_of_memory(new_committed.byte_size(), OOM_MMAP_ERROR, |
0 | 319 "card table expansion"); |
320 } | |
321 // Use new_end_aligned (as opposed to new_end_for_commit) because | |
322 // the cur_committed region may include the guard region. | |
323 } else if (new_end_aligned < cur_committed.end()) { | |
324 // Must uncommit pages. | |
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325 MemRegion const uncommit_region = |
0 | 326 committed_unique_to_self(ind, MemRegion(new_end_aligned, |
327 cur_committed.end())); | |
328 if (!uncommit_region.is_empty()) { | |
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329 // It is not safe to uncommit cards if the boundary between |
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330 // the generations is moving. A shrink can uncommit cards |
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331 // owned by generation A but being used by generation B. |
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332 if (!UseAdaptiveGCBoundary) { |
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333 if (!os::uncommit_memory((char*)uncommit_region.start(), |
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334 uncommit_region.byte_size())) { |
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335 assert(false, "Card table contraction failed"); |
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336 // The call failed so don't change the end of the |
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337 // committed region. This is better than taking the |
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338 // VM down. |
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339 new_end_aligned = _committed[ind].end(); |
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340 } |
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341 } else { |
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342 new_end_aligned = _committed[ind].end(); |
0 | 343 } |
344 } | |
345 } | |
346 // In any case, we can reset the end of the current committed entry. | |
347 _committed[ind].set_end(new_end_aligned); | |
348 | |
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349 #ifdef ASSERT |
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350 // Check that the last card in the new region is committed according |
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351 // to the tables. |
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352 bool covered = false; |
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353 for (int cr = 0; cr < _cur_covered_regions; cr++) { |
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354 if (_committed[cr].contains(new_end - 1)) { |
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355 covered = true; |
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356 break; |
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357 } |
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358 } |
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359 assert(covered, "Card for end of new region not committed"); |
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360 #endif |
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361 |
0 | 362 // The default of 0 is not necessarily clean cards. |
363 jbyte* entry; | |
364 if (old_region.last() < _whole_heap.start()) { | |
365 entry = byte_for(_whole_heap.start()); | |
366 } else { | |
367 entry = byte_after(old_region.last()); | |
368 } | |
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369 assert(index_for(new_region.last()) < _guard_index, |
0 | 370 "The guard card will be overwritten"); |
208
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371 // This line commented out cleans the newly expanded region and |
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372 // not the aligned up expanded region. |
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373 // jbyte* const end = byte_after(new_region.last()); |
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374 jbyte* const end = (jbyte*) new_end_for_commit; |
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375 assert((end >= byte_after(new_region.last())) || collided || guarded, |
208
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376 "Expect to be beyond new region unless impacting another region"); |
0 | 377 // do nothing if we resized downward. |
208
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378 #ifdef ASSERT |
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379 for (int ri = 0; ri < _cur_covered_regions; ri++) { |
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380 if (ri != ind) { |
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381 // The end of the new committed region should not |
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382 // be in any existing region unless it matches |
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383 // the start of the next region. |
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384 assert(!_committed[ri].contains(end) || |
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385 (_committed[ri].start() == (HeapWord*) end), |
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386 "Overlapping committed regions"); |
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387 } |
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388 } |
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389 #endif |
0 | 390 if (entry < end) { |
391 memset(entry, clean_card, pointer_delta(end, entry, sizeof(jbyte))); | |
392 } | |
393 } | |
394 // In any case, the covered size changes. | |
395 _covered[ind].set_word_size(new_region.word_size()); | |
396 if (TraceCardTableModRefBS) { | |
397 gclog_or_tty->print_cr("CardTableModRefBS::resize_covered_region: "); | |
398 gclog_or_tty->print_cr(" " | |
399 " _covered[%d].start(): " INTPTR_FORMAT | |
400 " _covered[%d].last(): " INTPTR_FORMAT, | |
401 ind, _covered[ind].start(), | |
402 ind, _covered[ind].last()); | |
403 gclog_or_tty->print_cr(" " | |
404 " _committed[%d].start(): " INTPTR_FORMAT | |
405 " _committed[%d].last(): " INTPTR_FORMAT, | |
406 ind, _committed[ind].start(), | |
407 ind, _committed[ind].last()); | |
408 gclog_or_tty->print_cr(" " | |
409 " byte_for(start): " INTPTR_FORMAT | |
410 " byte_for(last): " INTPTR_FORMAT, | |
411 byte_for(_covered[ind].start()), | |
412 byte_for(_covered[ind].last())); | |
413 gclog_or_tty->print_cr(" " | |
414 " addr_for(start): " INTPTR_FORMAT | |
415 " addr_for(last): " INTPTR_FORMAT, | |
416 addr_for((jbyte*) _committed[ind].start()), | |
417 addr_for((jbyte*) _committed[ind].last())); | |
418 } | |
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419 // Touch the last card of the covered region to show that it |
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420 // is committed (or SEGV). |
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421 debug_only(*byte_for(_covered[ind].last());) |
0 | 422 debug_only(verify_guard();) |
423 } | |
424 | |
425 // Note that these versions are precise! The scanning code has to handle the | |
426 // fact that the write barrier may be either precise or imprecise. | |
427 | |
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428 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal) { |
0 | 429 inline_write_ref_field(field, newVal); |
430 } | |
431 | |
616
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432 /* |
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433 Claimed and deferred bits are used together in G1 during the evacuation |
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434 pause. These bits can have the following state transitions: |
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435 1. The claimed bit can be put over any other card state. Except that |
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436 the "dirty -> dirty and claimed" transition is checked for in |
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437 G1 code and is not used. |
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438 2. Deferred bit can be set only if the previous state of the card |
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439 was either clean or claimed. mark_card_deferred() is wait-free. |
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440 We do not care if the operation is be successful because if |
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441 it does not it will only result in duplicate entry in the update |
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442 buffer because of the "cache-miss". So it's not worth spinning. |
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443 */ |
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444 |
0 | 445 |
342
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446 bool CardTableModRefBS::claim_card(size_t card_index) { |
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447 jbyte val = _byte_map[card_index]; |
616
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448 assert(val != dirty_card_val(), "Shouldn't claim a dirty card"); |
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449 while (val == clean_card_val() || |
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450 (val & (clean_card_mask_val() | claimed_card_val())) != claimed_card_val()) { |
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451 jbyte new_val = val; |
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452 if (val == clean_card_val()) { |
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453 new_val = (jbyte)claimed_card_val(); |
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454 } else { |
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455 new_val = val | (jbyte)claimed_card_val(); |
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456 } |
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457 jbyte res = Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
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458 if (res == val) { |
342
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459 return true; |
616
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460 } |
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461 val = res; |
342
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462 } |
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463 return false; |
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464 } |
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465 |
616
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466 bool CardTableModRefBS::mark_card_deferred(size_t card_index) { |
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467 jbyte val = _byte_map[card_index]; |
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468 // It's already processed |
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469 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
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470 return false; |
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471 } |
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472 // Cached bit can be installed either on a clean card or on a claimed card. |
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473 jbyte new_val = val; |
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474 if (val == clean_card_val()) { |
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475 new_val = (jbyte)deferred_card_val(); |
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476 } else { |
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477 if (val & claimed_card_val()) { |
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478 new_val = val | (jbyte)deferred_card_val(); |
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479 } |
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480 } |
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481 if (new_val != val) { |
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482 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
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483 } |
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484 return true; |
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485 } |
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486 |
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487 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp, |
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488 MemRegion mr, |
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489 OopsInGenClosure* cl, |
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490 CardTableRS* ct) { |
0 | 491 if (!mr.is_empty()) { |
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492 // Caller (process_strong_roots()) claims that all GC threads |
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493 // execute this call. With UseDynamicNumberOfGCThreads now all |
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494 // active GC threads execute this call. The number of active GC |
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495 // threads needs to be passed to par_non_clean_card_iterate_work() |
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496 // to get proper partitioning and termination. |
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497 // |
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498 // This is an example of where n_par_threads() is used instead |
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499 // of workers()->active_workers(). n_par_threads can be set to 0 to |
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500 // turn off parallelism. For example when this code is called as |
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501 // part of verification and SharedHeap::process_strong_roots() is being |
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502 // used, then n_par_threads() may have been set to 0. active_workers |
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503 // is not overloaded with the meaning that it is a switch to disable |
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504 // parallelism and so keeps the meaning of the number of |
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505 // active gc workers. If parallelism has not been shut off by |
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506 // setting n_par_threads to 0, then n_par_threads should be |
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507 // equal to active_workers. When a different mechanism for shutting |
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508 // off parallelism is used, then active_workers can be used in |
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509 // place of n_par_threads. |
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510 // This is an example of a path where n_par_threads is |
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511 // set to 0 to turn off parallism. |
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512 // [7] CardTableModRefBS::non_clean_card_iterate() |
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513 // [8] CardTableRS::younger_refs_in_space_iterate() |
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514 // [9] Generation::younger_refs_in_space_iterate() |
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515 // [10] OneContigSpaceCardGeneration::younger_refs_iterate() |
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516 // [11] CompactingPermGenGen::younger_refs_iterate() |
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517 // [12] CardTableRS::younger_refs_iterate() |
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518 // [13] SharedHeap::process_strong_roots() |
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519 // [14] G1CollectedHeap::verify() |
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520 // [15] Universe::verify() |
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521 // [16] G1CollectedHeap::do_collection_pause_at_safepoint() |
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522 // |
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523 int n_threads = SharedHeap::heap()->n_par_threads(); |
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524 bool is_par = n_threads > 0; |
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525 if (is_par) { |
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526 #if INCLUDE_ALL_GCS |
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527 assert(SharedHeap::heap()->n_par_threads() == |
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528 SharedHeap::heap()->workers()->active_workers(), "Mismatch"); |
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529 non_clean_card_iterate_parallel_work(sp, mr, cl, ct, n_threads); |
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530 #else // INCLUDE_ALL_GCS |
0 | 531 fatal("Parallel gc not supported here."); |
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532 #endif // INCLUDE_ALL_GCS |
0 | 533 } else { |
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534 // We do not call the non_clean_card_iterate_serial() version below because |
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535 // we want to clear the cards (which non_clean_card_iterate_serial() does not |
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536 // do for us): clear_cl here does the work of finding contiguous dirty ranges |
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537 // of cards to process and clear. |
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538 |
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539 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), |
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540 cl->gen_boundary()); |
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541 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct); |
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542 |
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543 clear_cl.do_MemRegion(mr); |
0 | 544 } |
545 } | |
546 } | |
547 | |
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548 // The iterator itself is not MT-aware, but |
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549 // MT-aware callers and closures can use this to |
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550 // accomplish dirty card iteration in parallel. The |
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551 // iterator itself does not clear the dirty cards, or |
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552 // change their values in any manner. |
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553 void CardTableModRefBS::non_clean_card_iterate_serial(MemRegion mr, |
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554 MemRegionClosure* cl) { |
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555 bool is_par = (SharedHeap::heap()->n_par_threads() > 0); |
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556 assert(!is_par || |
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557 (SharedHeap::heap()->n_par_threads() == |
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558 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 559 for (int i = 0; i < _cur_covered_regions; i++) { |
560 MemRegion mri = mr.intersection(_covered[i]); | |
561 if (mri.word_size() > 0) { | |
562 jbyte* cur_entry = byte_for(mri.last()); | |
563 jbyte* limit = byte_for(mri.start()); | |
564 while (cur_entry >= limit) { | |
565 jbyte* next_entry = cur_entry - 1; | |
566 if (*cur_entry != clean_card) { | |
567 size_t non_clean_cards = 1; | |
568 // Should the next card be included in this range of dirty cards. | |
569 while (next_entry >= limit && *next_entry != clean_card) { | |
570 non_clean_cards++; | |
571 cur_entry = next_entry; | |
572 next_entry--; | |
573 } | |
574 // The memory region may not be on a card boundary. So that | |
575 // objects beyond the end of the region are not processed, make | |
576 // cur_cards precise with regard to the end of the memory region. | |
577 MemRegion cur_cards(addr_for(cur_entry), | |
578 non_clean_cards * card_size_in_words); | |
579 MemRegion dirty_region = cur_cards.intersection(mri); | |
580 cl->do_MemRegion(dirty_region); | |
581 } | |
582 cur_entry = next_entry; | |
583 } | |
584 } | |
585 } | |
586 } | |
587 | |
588 void CardTableModRefBS::dirty_MemRegion(MemRegion mr) { | |
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589 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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590 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 591 jbyte* cur = byte_for(mr.start()); |
592 jbyte* last = byte_after(mr.last()); | |
593 while (cur < last) { | |
594 *cur = dirty_card; | |
595 cur++; | |
596 } | |
597 } | |
598 | |
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599 void CardTableModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
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600 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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601 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
0 | 602 for (int i = 0; i < _cur_covered_regions; i++) { |
603 MemRegion mri = mr.intersection(_covered[i]); | |
604 if (!mri.is_empty()) dirty_MemRegion(mri); | |
605 } | |
606 } | |
607 | |
608 void CardTableModRefBS::clear_MemRegion(MemRegion mr) { | |
609 // Be conservative: only clean cards entirely contained within the | |
610 // region. | |
611 jbyte* cur; | |
612 if (mr.start() == _whole_heap.start()) { | |
613 cur = byte_for(mr.start()); | |
614 } else { | |
615 assert(mr.start() > _whole_heap.start(), "mr is not covered."); | |
616 cur = byte_after(mr.start() - 1); | |
617 } | |
618 jbyte* last = byte_after(mr.last()); | |
619 memset(cur, clean_card, pointer_delta(last, cur, sizeof(jbyte))); | |
620 } | |
621 | |
622 void CardTableModRefBS::clear(MemRegion mr) { | |
623 for (int i = 0; i < _cur_covered_regions; i++) { | |
624 MemRegion mri = mr.intersection(_covered[i]); | |
625 if (!mri.is_empty()) clear_MemRegion(mri); | |
626 } | |
627 } | |
628 | |
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629 void CardTableModRefBS::dirty(MemRegion mr) { |
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630 jbyte* first = byte_for(mr.start()); |
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631 jbyte* last = byte_after(mr.last()); |
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632 memset(first, dirty_card, last-first); |
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633 } |
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634 |
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635 // Unlike several other card table methods, dirty_card_iterate() |
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636 // iterates over dirty cards ranges in increasing address order. |
0 | 637 void CardTableModRefBS::dirty_card_iterate(MemRegion mr, |
638 MemRegionClosure* cl) { | |
639 for (int i = 0; i < _cur_covered_regions; i++) { | |
640 MemRegion mri = mr.intersection(_covered[i]); | |
641 if (!mri.is_empty()) { | |
642 jbyte *cur_entry, *next_entry, *limit; | |
643 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
644 cur_entry <= limit; | |
645 cur_entry = next_entry) { | |
646 next_entry = cur_entry + 1; | |
647 if (*cur_entry == dirty_card) { | |
648 size_t dirty_cards; | |
649 // Accumulate maximal dirty card range, starting at cur_entry | |
650 for (dirty_cards = 1; | |
651 next_entry <= limit && *next_entry == dirty_card; | |
652 dirty_cards++, next_entry++); | |
653 MemRegion cur_cards(addr_for(cur_entry), | |
654 dirty_cards*card_size_in_words); | |
655 cl->do_MemRegion(cur_cards); | |
656 } | |
657 } | |
658 } | |
659 } | |
660 } | |
661 | |
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662 MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr, |
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663 bool reset, |
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664 int reset_val) { |
0 | 665 for (int i = 0; i < _cur_covered_regions; i++) { |
666 MemRegion mri = mr.intersection(_covered[i]); | |
667 if (!mri.is_empty()) { | |
668 jbyte* cur_entry, *next_entry, *limit; | |
669 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
670 cur_entry <= limit; | |
671 cur_entry = next_entry) { | |
672 next_entry = cur_entry + 1; | |
673 if (*cur_entry == dirty_card) { | |
674 size_t dirty_cards; | |
675 // Accumulate maximal dirty card range, starting at cur_entry | |
676 for (dirty_cards = 1; | |
677 next_entry <= limit && *next_entry == dirty_card; | |
678 dirty_cards++, next_entry++); | |
679 MemRegion cur_cards(addr_for(cur_entry), | |
680 dirty_cards*card_size_in_words); | |
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681 if (reset) { |
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682 for (size_t i = 0; i < dirty_cards; i++) { |
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683 cur_entry[i] = reset_val; |
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684 } |
0 | 685 } |
686 return cur_cards; | |
687 } | |
688 } | |
689 } | |
690 } | |
691 return MemRegion(mr.end(), mr.end()); | |
692 } | |
693 | |
694 uintx CardTableModRefBS::ct_max_alignment_constraint() { | |
695 return card_size * os::vm_page_size(); | |
696 } | |
697 | |
698 void CardTableModRefBS::verify_guard() { | |
699 // For product build verification | |
700 guarantee(_byte_map[_guard_index] == last_card, | |
701 "card table guard has been modified"); | |
702 } | |
703 | |
704 void CardTableModRefBS::verify() { | |
705 verify_guard(); | |
706 } | |
707 | |
708 #ifndef PRODUCT | |
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709 void CardTableModRefBS::verify_region(MemRegion mr, |
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710 jbyte val, bool val_equals) { |
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711 jbyte* start = byte_for(mr.start()); |
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712 jbyte* end = byte_for(mr.last()); |
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713 bool failures = false; |
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714 for (jbyte* curr = start; curr <= end; ++curr) { |
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715 jbyte curr_val = *curr; |
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716 bool failed = (val_equals) ? (curr_val != val) : (curr_val == val); |
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717 if (failed) { |
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718 if (!failures) { |
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719 tty->cr(); |
8668 | 720 tty->print_cr("== CT verification failed: ["PTR_FORMAT","PTR_FORMAT"]", start, end); |
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721 tty->print_cr("== %sexpecting value: %d", |
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722 (val_equals) ? "" : "not ", val); |
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723 failures = true; |
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724 } |
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725 tty->print_cr("== card "PTR_FORMAT" ["PTR_FORMAT","PTR_FORMAT"], " |
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726 "val: %d", curr, addr_for(curr), |
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727 (HeapWord*) (((size_t) addr_for(curr)) + card_size), |
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728 (int) curr_val); |
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729 } |
0 | 730 } |
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731 guarantee(!failures, "there should not have been any failures"); |
0 | 732 } |
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733 |
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734 void CardTableModRefBS::verify_not_dirty_region(MemRegion mr) { |
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735 verify_region(mr, dirty_card, false /* val_equals */); |
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736 } |
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737 |
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738 void CardTableModRefBS::verify_dirty_region(MemRegion mr) { |
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739 verify_region(mr, dirty_card, true /* val_equals */); |
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740 } |
0 | 741 #endif |
742 | |
5984 | 743 void CardTableModRefBS::print_on(outputStream* st) const { |
744 st->print_cr("Card table byte_map: [" INTPTR_FORMAT "," INTPTR_FORMAT "] byte_map_base: " INTPTR_FORMAT, | |
745 _byte_map, _byte_map + _byte_map_size, byte_map_base); | |
746 } | |
747 | |
0 | 748 bool CardTableModRefBSForCTRS::card_will_be_scanned(jbyte cv) { |
749 return | |
750 CardTableModRefBS::card_will_be_scanned(cv) || | |
751 _rs->is_prev_nonclean_card_val(cv); | |
752 }; | |
753 | |
754 bool CardTableModRefBSForCTRS::card_may_have_been_dirty(jbyte cv) { | |
755 return | |
756 cv != clean_card && | |
757 (CardTableModRefBS::card_may_have_been_dirty(cv) || | |
758 CardTableRS::youngergen_may_have_been_dirty(cv)); | |
759 }; |