Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.cpp @ 3317:063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
Summary: We should only undirty cards after we decide that they are not on a young region, not before. The fix also includes improvements to the verify_dirty_region() method which print out which cards were not found dirty.
Reviewed-by: johnc, brutisso
| author | tonyp |
|---|---|
| date | Fri, 29 Apr 2011 14:59:04 -0400 |
| parents | c48ad6ab8bdf |
| children | fc2b798ab316 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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 * | |
|
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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();) | |
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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. |
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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(), |
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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(), |
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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 } | |
|
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340 assert(index_for(new_region.last()) < _guard_index, |
| 0 | 341 "The guard card will be overwritten"); |
|
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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, |
|
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347 "Expect to be beyond new region unless impacting another region"); |
| 0 | 348 // do nothing if we resized downward. |
|
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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 | |
|
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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 |
|
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417 bool CardTableModRefBS::claim_card(size_t card_index) { |
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418 jbyte val = _byte_map[card_index]; |
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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) { |
|
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430 return true; |
|
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431 } |
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432 val = res; |
|
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433 } |
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434 return false; |
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435 } |
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436 |
|
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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 |
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459 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp, |
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460 MemRegion mr, |
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461 DirtyCardToOopClosure* dcto_cl, |
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462 ClearNoncleanCardWrapper* cl) { |
| 0 | 463 if (!mr.is_empty()) { |
| 464 int n_threads = SharedHeap::heap()->n_par_threads(); | |
| 465 if (n_threads > 0) { | |
| 466 #ifndef SERIALGC | |
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467 non_clean_card_iterate_parallel_work(sp, mr, dcto_cl, cl, n_threads); |
| 0 | 468 #else // SERIALGC |
| 469 fatal("Parallel gc not supported here."); | |
| 470 #endif // SERIALGC | |
| 471 } else { | |
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472 // We do not call the non_clean_card_iterate_serial() version below because |
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473 // we want to clear the cards (which non_clean_card_iterate_serial() does not |
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474 // do for us), and the ClearNoncleanCardWrapper closure itself does the work |
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475 // of finding contiguous dirty ranges of cards to process (and clear). |
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476 cl->do_MemRegion(mr); |
| 0 | 477 } |
| 478 } | |
| 479 } | |
| 480 | |
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481 // The iterator itself is not MT-aware, but |
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482 // MT-aware callers and closures can use this to |
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483 // accomplish dirty card iteration in parallel. The |
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484 // iterator itself does not clear the dirty cards, or |
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485 // change their values in any manner. |
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486 void CardTableModRefBS::non_clean_card_iterate_serial(MemRegion mr, |
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487 MemRegionClosure* cl) { |
| 0 | 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 cl->do_MemRegion(dirty_region); | |
| 510 } | |
| 511 cur_entry = next_entry; | |
| 512 } | |
| 513 } | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 void CardTableModRefBS::dirty_MemRegion(MemRegion mr) { | |
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518 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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519 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
| 0 | 520 jbyte* cur = byte_for(mr.start()); |
| 521 jbyte* last = byte_after(mr.last()); | |
| 522 while (cur < last) { | |
| 523 *cur = dirty_card; | |
| 524 cur++; | |
| 525 } | |
| 526 } | |
| 527 | |
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528 void CardTableModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
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529 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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530 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
| 0 | 531 for (int i = 0; i < _cur_covered_regions; i++) { |
| 532 MemRegion mri = mr.intersection(_covered[i]); | |
| 533 if (!mri.is_empty()) dirty_MemRegion(mri); | |
| 534 } | |
| 535 } | |
| 536 | |
| 537 void CardTableModRefBS::clear_MemRegion(MemRegion mr) { | |
| 538 // Be conservative: only clean cards entirely contained within the | |
| 539 // region. | |
| 540 jbyte* cur; | |
| 541 if (mr.start() == _whole_heap.start()) { | |
| 542 cur = byte_for(mr.start()); | |
| 543 } else { | |
| 544 assert(mr.start() > _whole_heap.start(), "mr is not covered."); | |
| 545 cur = byte_after(mr.start() - 1); | |
| 546 } | |
| 547 jbyte* last = byte_after(mr.last()); | |
| 548 memset(cur, clean_card, pointer_delta(last, cur, sizeof(jbyte))); | |
| 549 } | |
| 550 | |
| 551 void CardTableModRefBS::clear(MemRegion mr) { | |
| 552 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 553 MemRegion mri = mr.intersection(_covered[i]); | |
| 554 if (!mri.is_empty()) clear_MemRegion(mri); | |
| 555 } | |
| 556 } | |
| 557 | |
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558 void CardTableModRefBS::dirty(MemRegion mr) { |
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559 jbyte* first = byte_for(mr.start()); |
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560 jbyte* last = byte_after(mr.last()); |
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561 memset(first, dirty_card, last-first); |
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562 } |
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563 |
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564 // Unlike several other card table methods, dirty_card_iterate() |
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565 // iterates over dirty cards ranges in increasing address order. |
| 0 | 566 void CardTableModRefBS::dirty_card_iterate(MemRegion mr, |
| 567 MemRegionClosure* cl) { | |
| 568 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 569 MemRegion mri = mr.intersection(_covered[i]); | |
| 570 if (!mri.is_empty()) { | |
| 571 jbyte *cur_entry, *next_entry, *limit; | |
| 572 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
| 573 cur_entry <= limit; | |
| 574 cur_entry = next_entry) { | |
| 575 next_entry = cur_entry + 1; | |
| 576 if (*cur_entry == dirty_card) { | |
| 577 size_t dirty_cards; | |
| 578 // Accumulate maximal dirty card range, starting at cur_entry | |
| 579 for (dirty_cards = 1; | |
| 580 next_entry <= limit && *next_entry == dirty_card; | |
| 581 dirty_cards++, next_entry++); | |
| 582 MemRegion cur_cards(addr_for(cur_entry), | |
| 583 dirty_cards*card_size_in_words); | |
| 584 cl->do_MemRegion(cur_cards); | |
| 585 } | |
| 586 } | |
| 587 } | |
| 588 } | |
| 589 } | |
| 590 | |
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591 MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr, |
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592 bool reset, |
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593 int reset_val) { |
| 0 | 594 for (int i = 0; i < _cur_covered_regions; i++) { |
| 595 MemRegion mri = mr.intersection(_covered[i]); | |
| 596 if (!mri.is_empty()) { | |
| 597 jbyte* cur_entry, *next_entry, *limit; | |
| 598 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
| 599 cur_entry <= limit; | |
| 600 cur_entry = next_entry) { | |
| 601 next_entry = cur_entry + 1; | |
| 602 if (*cur_entry == dirty_card) { | |
| 603 size_t dirty_cards; | |
| 604 // Accumulate maximal dirty card range, starting at cur_entry | |
| 605 for (dirty_cards = 1; | |
| 606 next_entry <= limit && *next_entry == dirty_card; | |
| 607 dirty_cards++, next_entry++); | |
| 608 MemRegion cur_cards(addr_for(cur_entry), | |
| 609 dirty_cards*card_size_in_words); | |
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610 if (reset) { |
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611 for (size_t i = 0; i < dirty_cards; i++) { |
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612 cur_entry[i] = reset_val; |
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613 } |
| 0 | 614 } |
| 615 return cur_cards; | |
| 616 } | |
| 617 } | |
| 618 } | |
| 619 } | |
| 620 return MemRegion(mr.end(), mr.end()); | |
| 621 } | |
| 622 | |
| 623 // Set all the dirty cards in the given region to "precleaned" state. | |
| 624 void CardTableModRefBS::preclean_dirty_cards(MemRegion mr) { | |
| 625 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 626 MemRegion mri = mr.intersection(_covered[i]); | |
| 627 if (!mri.is_empty()) { | |
| 628 jbyte *cur_entry, *limit; | |
| 629 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
| 630 cur_entry <= limit; | |
| 631 cur_entry++) { | |
| 632 if (*cur_entry == dirty_card) { | |
| 633 *cur_entry = precleaned_card; | |
| 634 } | |
| 635 } | |
| 636 } | |
| 637 } | |
| 638 } | |
| 639 | |
| 640 uintx CardTableModRefBS::ct_max_alignment_constraint() { | |
| 641 return card_size * os::vm_page_size(); | |
| 642 } | |
| 643 | |
| 644 void CardTableModRefBS::verify_guard() { | |
| 645 // For product build verification | |
| 646 guarantee(_byte_map[_guard_index] == last_card, | |
| 647 "card table guard has been modified"); | |
| 648 } | |
| 649 | |
| 650 void CardTableModRefBS::verify() { | |
| 651 verify_guard(); | |
| 652 } | |
| 653 | |
| 654 #ifndef PRODUCT | |
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655 void CardTableModRefBS::verify_region(MemRegion mr, |
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656 jbyte val, bool val_equals) { |
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657 jbyte* start = byte_for(mr.start()); |
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658 jbyte* end = byte_for(mr.last()); |
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659 bool failures = false; |
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660 for (jbyte* curr = start; curr <= end; ++curr) { |
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661 jbyte curr_val = *curr; |
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662 bool failed = (val_equals) ? (curr_val != val) : (curr_val == val); |
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663 if (failed) { |
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664 if (!failures) { |
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665 tty->cr(); |
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666 tty->print_cr("== CT verification failed: ["PTR_FORMAT","PTR_FORMAT"]"); |
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667 tty->print_cr("== %sexpecting value: %d", |
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668 (val_equals) ? "" : "not ", val); |
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669 failures = true; |
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670 } |
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671 tty->print_cr("== card "PTR_FORMAT" ["PTR_FORMAT","PTR_FORMAT"], " |
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672 "val: %d", curr, addr_for(curr), |
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673 (HeapWord*) (((size_t) addr_for(curr)) + card_size), |
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674 (int) curr_val); |
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675 } |
| 0 | 676 } |
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677 guarantee(!failures, "there should not have been any failures"); |
| 0 | 678 } |
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679 |
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680 void CardTableModRefBS::verify_not_dirty_region(MemRegion mr) { |
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681 verify_region(mr, dirty_card, false /* val_equals */); |
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682 } |
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683 |
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684 void CardTableModRefBS::verify_dirty_region(MemRegion mr) { |
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685 verify_region(mr, dirty_card, true /* val_equals */); |
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686 } |
| 0 | 687 #endif |
| 688 | |
| 689 bool CardTableModRefBSForCTRS::card_will_be_scanned(jbyte cv) { | |
| 690 return | |
| 691 CardTableModRefBS::card_will_be_scanned(cv) || | |
| 692 _rs->is_prev_nonclean_card_val(cv); | |
| 693 }; | |
| 694 | |
| 695 bool CardTableModRefBSForCTRS::card_may_have_been_dirty(jbyte cv) { | |
| 696 return | |
| 697 cv != clean_card && | |
| 698 (CardTableModRefBS::card_may_have_been_dirty(cv) || | |
| 699 CardTableRS::youngergen_may_have_been_dirty(cv)); | |
| 700 }; |