Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableModRefBS.cpp @ 10973:ef57c43512d6
8014431: cleanup warnings indicated by the -Wunused-value compiler option on linux
Reviewed-by: dholmes, coleenp
Contributed-by: jeremymanson@google.com, calvin.cheung@oracle.com
| author | ccheung |
|---|---|
| date | Thu, 13 Jun 2013 22:02:40 -0700 |
| parents | a837fa3d3f86 |
| children | d55c004e1d4d |
| rev | line source |
|---|---|
| 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); | |
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113 os::commit_memory_or_exit((char*)guard_page, _page_size, _page_size, |
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114 !ExecMem, "card table last card"); |
| 0 | 115 *guard_card = last_card; |
| 116 | |
| 117 _lowest_non_clean = | |
| 6197 | 118 NEW_C_HEAP_ARRAY(CardArr, max_covered_regions, mtGC); |
| 0 | 119 _lowest_non_clean_chunk_size = |
| 6197 | 120 NEW_C_HEAP_ARRAY(size_t, max_covered_regions, mtGC); |
| 0 | 121 _lowest_non_clean_base_chunk_index = |
| 6197 | 122 NEW_C_HEAP_ARRAY(uintptr_t, max_covered_regions, mtGC); |
| 0 | 123 _last_LNC_resizing_collection = |
| 6197 | 124 NEW_C_HEAP_ARRAY(int, max_covered_regions, mtGC); |
| 0 | 125 if (_lowest_non_clean == NULL |
| 126 || _lowest_non_clean_chunk_size == NULL | |
| 127 || _lowest_non_clean_base_chunk_index == NULL | |
| 128 || _last_LNC_resizing_collection == NULL) | |
| 129 vm_exit_during_initialization("couldn't allocate an LNC array."); | |
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130 for (int i = 0; i < max_covered_regions; i++) { |
| 0 | 131 _lowest_non_clean[i] = NULL; |
| 132 _lowest_non_clean_chunk_size[i] = 0; | |
| 133 _last_LNC_resizing_collection[i] = -1; | |
| 134 } | |
| 135 | |
| 136 if (TraceCardTableModRefBS) { | |
| 137 gclog_or_tty->print_cr("CardTableModRefBS::CardTableModRefBS: "); | |
| 138 gclog_or_tty->print_cr(" " | |
| 139 " &_byte_map[0]: " INTPTR_FORMAT | |
| 140 " &_byte_map[_last_valid_index]: " INTPTR_FORMAT, | |
| 141 &_byte_map[0], | |
| 142 &_byte_map[_last_valid_index]); | |
| 143 gclog_or_tty->print_cr(" " | |
| 144 " byte_map_base: " INTPTR_FORMAT, | |
| 145 byte_map_base); | |
| 146 } | |
| 147 } | |
| 148 | |
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149 CardTableModRefBS::~CardTableModRefBS() { |
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150 if (_covered) { |
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151 delete[] _covered; |
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152 _covered = NULL; |
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153 } |
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154 if (_committed) { |
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155 delete[] _committed; |
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156 _committed = NULL; |
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157 } |
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158 if (_lowest_non_clean) { |
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159 FREE_C_HEAP_ARRAY(CardArr, _lowest_non_clean, mtGC); |
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160 _lowest_non_clean = NULL; |
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161 } |
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162 if (_lowest_non_clean_chunk_size) { |
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163 FREE_C_HEAP_ARRAY(size_t, _lowest_non_clean_chunk_size, mtGC); |
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164 _lowest_non_clean_chunk_size = NULL; |
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165 } |
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166 if (_lowest_non_clean_base_chunk_index) { |
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167 FREE_C_HEAP_ARRAY(uintptr_t, _lowest_non_clean_base_chunk_index, mtGC); |
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168 _lowest_non_clean_base_chunk_index = NULL; |
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169 } |
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170 if (_last_LNC_resizing_collection) { |
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171 FREE_C_HEAP_ARRAY(int, _last_LNC_resizing_collection, mtGC); |
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172 _last_LNC_resizing_collection = NULL; |
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173 } |
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174 } |
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175 |
| 0 | 176 int CardTableModRefBS::find_covering_region_by_base(HeapWord* base) { |
| 177 int i; | |
| 178 for (i = 0; i < _cur_covered_regions; i++) { | |
| 179 if (_covered[i].start() == base) return i; | |
| 180 if (_covered[i].start() > base) break; | |
| 181 } | |
| 182 // If we didn't find it, create a new one. | |
| 183 assert(_cur_covered_regions < _max_covered_regions, | |
| 184 "too many covered regions"); | |
| 185 // Move the ones above up, to maintain sorted order. | |
| 186 for (int j = _cur_covered_regions; j > i; j--) { | |
| 187 _covered[j] = _covered[j-1]; | |
| 188 _committed[j] = _committed[j-1]; | |
| 189 } | |
| 190 int res = i; | |
| 191 _cur_covered_regions++; | |
| 192 _covered[res].set_start(base); | |
| 193 _covered[res].set_word_size(0); | |
| 194 jbyte* ct_start = byte_for(base); | |
| 195 uintptr_t ct_start_aligned = align_size_down((uintptr_t)ct_start, _page_size); | |
| 196 _committed[res].set_start((HeapWord*)ct_start_aligned); | |
| 197 _committed[res].set_word_size(0); | |
| 198 return res; | |
| 199 } | |
| 200 | |
| 201 int CardTableModRefBS::find_covering_region_containing(HeapWord* addr) { | |
| 202 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 203 if (_covered[i].contains(addr)) { | |
| 204 return i; | |
| 205 } | |
| 206 } | |
| 207 assert(0, "address outside of heap?"); | |
| 208 return -1; | |
| 209 } | |
| 210 | |
| 211 HeapWord* CardTableModRefBS::largest_prev_committed_end(int ind) const { | |
| 212 HeapWord* max_end = NULL; | |
| 213 for (int j = 0; j < ind; j++) { | |
| 214 HeapWord* this_end = _committed[j].end(); | |
| 215 if (this_end > max_end) max_end = this_end; | |
| 216 } | |
| 217 return max_end; | |
| 218 } | |
| 219 | |
| 220 MemRegion CardTableModRefBS::committed_unique_to_self(int self, | |
| 221 MemRegion mr) const { | |
| 222 MemRegion result = mr; | |
| 223 for (int r = 0; r < _cur_covered_regions; r += 1) { | |
| 224 if (r != self) { | |
| 225 result = result.minus(_committed[r]); | |
| 226 } | |
| 227 } | |
| 228 // Never include the guard page. | |
| 229 result = result.minus(_guard_region); | |
| 230 return result; | |
| 231 } | |
| 232 | |
| 233 void CardTableModRefBS::resize_covered_region(MemRegion new_region) { | |
| 234 // We don't change the start of a region, only the end. | |
| 235 assert(_whole_heap.contains(new_region), | |
| 236 "attempt to cover area not in reserved area"); | |
| 237 debug_only(verify_guard();) | |
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238 // collided is true if the expansion would push into another committed region |
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239 debug_only(bool collided = false;) |
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240 int const ind = find_covering_region_by_base(new_region.start()); |
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241 MemRegion const old_region = _covered[ind]; |
| 0 | 242 assert(old_region.start() == new_region.start(), "just checking"); |
| 243 if (new_region.word_size() != old_region.word_size()) { | |
| 244 // Commit new or uncommit old pages, if necessary. | |
| 245 MemRegion cur_committed = _committed[ind]; | |
| 246 // Extend the end of this _commited region | |
| 247 // to cover the end of any lower _committed regions. | |
| 248 // This forms overlapping regions, but never interior regions. | |
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249 HeapWord* const max_prev_end = largest_prev_committed_end(ind); |
| 0 | 250 if (max_prev_end > cur_committed.end()) { |
| 251 cur_committed.set_end(max_prev_end); | |
| 252 } | |
| 253 // Align the end up to a page size (starts are already aligned). | |
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254 jbyte* const new_end = byte_after(new_region.last()); |
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255 HeapWord* new_end_aligned = |
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256 (HeapWord*) align_size_up((uintptr_t)new_end, _page_size); |
| 0 | 257 assert(new_end_aligned >= (HeapWord*) new_end, |
| 258 "align up, but less"); | |
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259 // Check the other regions (excludes "ind") to ensure that |
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260 // the new_end_aligned does not intrude onto the committed |
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261 // space of another region. |
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262 int ri = 0; |
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263 for (ri = 0; ri < _cur_covered_regions; ri++) { |
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264 if (ri != ind) { |
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265 if (_committed[ri].contains(new_end_aligned)) { |
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266 // The prior check included in the assert |
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267 // (new_end_aligned >= _committed[ri].start()) |
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268 // is redundant with the "contains" test. |
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269 // Any region containing the new end |
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270 // should start at or beyond the region found (ind) |
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271 // for the new end (committed regions are not expected to |
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272 // be proper subsets of other committed regions). |
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273 assert(_committed[ri].start() >= _committed[ind].start(), |
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274 "New end of committed region is inconsistent"); |
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275 new_end_aligned = _committed[ri].start(); |
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276 // new_end_aligned can be equal to the start of its |
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277 // committed region (i.e., of "ind") if a second |
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278 // region following "ind" also start at the same location |
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279 // as "ind". |
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280 assert(new_end_aligned >= _committed[ind].start(), |
|
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281 "New end of committed region is before start"); |
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282 debug_only(collided = true;) |
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283 // Should only collide with 1 region |
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284 break; |
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285 } |
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286 } |
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287 } |
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288 #ifdef ASSERT |
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289 for (++ri; ri < _cur_covered_regions; ri++) { |
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290 assert(!_committed[ri].contains(new_end_aligned), |
|
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291 "New end of committed region is in a second committed region"); |
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292 } |
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293 #endif |
| 0 | 294 // The guard page is always committed and should not be committed over. |
|
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295 // "guarded" is used for assertion checking below and recalls the fact |
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296 // that the would-be end of the new committed region would have |
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297 // penetrated the guard page. |
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298 HeapWord* new_end_for_commit = new_end_aligned; |
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299 |
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300 DEBUG_ONLY(bool guarded = false;) |
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301 if (new_end_for_commit > _guard_region.start()) { |
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302 new_end_for_commit = _guard_region.start(); |
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303 DEBUG_ONLY(guarded = true;) |
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304 } |
|
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305 |
| 0 | 306 if (new_end_for_commit > cur_committed.end()) { |
| 307 // Must commit new pages. | |
|
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308 MemRegion const new_committed = |
| 0 | 309 MemRegion(cur_committed.end(), new_end_for_commit); |
| 310 | |
| 311 assert(!new_committed.is_empty(), "Region should not be empty here"); | |
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312 os::commit_memory_or_exit((char*)new_committed.start(), |
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313 new_committed.byte_size(), _page_size, |
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314 !ExecMem, "card table expansion"); |
| 0 | 315 // Use new_end_aligned (as opposed to new_end_for_commit) because |
| 316 // the cur_committed region may include the guard region. | |
| 317 } else if (new_end_aligned < cur_committed.end()) { | |
| 318 // Must uncommit pages. | |
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319 MemRegion const uncommit_region = |
| 0 | 320 committed_unique_to_self(ind, MemRegion(new_end_aligned, |
| 321 cur_committed.end())); | |
| 322 if (!uncommit_region.is_empty()) { | |
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323 // It is not safe to uncommit cards if the boundary between |
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324 // the generations is moving. A shrink can uncommit cards |
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325 // owned by generation A but being used by generation B. |
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326 if (!UseAdaptiveGCBoundary) { |
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327 if (!os::uncommit_memory((char*)uncommit_region.start(), |
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328 uncommit_region.byte_size())) { |
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329 assert(false, "Card table contraction failed"); |
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330 // The call failed so don't change the end of the |
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331 // committed region. This is better than taking the |
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332 // VM down. |
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333 new_end_aligned = _committed[ind].end(); |
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334 } |
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335 } else { |
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336 new_end_aligned = _committed[ind].end(); |
| 0 | 337 } |
| 338 } | |
| 339 } | |
| 340 // In any case, we can reset the end of the current committed entry. | |
| 341 _committed[ind].set_end(new_end_aligned); | |
| 342 | |
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343 #ifdef ASSERT |
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344 // Check that the last card in the new region is committed according |
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345 // to the tables. |
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346 bool covered = false; |
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347 for (int cr = 0; cr < _cur_covered_regions; cr++) { |
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348 if (_committed[cr].contains(new_end - 1)) { |
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349 covered = true; |
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350 break; |
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351 } |
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352 } |
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353 assert(covered, "Card for end of new region not committed"); |
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354 #endif |
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355 |
| 0 | 356 // The default of 0 is not necessarily clean cards. |
| 357 jbyte* entry; | |
| 358 if (old_region.last() < _whole_heap.start()) { | |
| 359 entry = byte_for(_whole_heap.start()); | |
| 360 } else { | |
| 361 entry = byte_after(old_region.last()); | |
| 362 } | |
|
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363 assert(index_for(new_region.last()) < _guard_index, |
| 0 | 364 "The guard card will be overwritten"); |
|
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365 // This line commented out cleans the newly expanded region and |
|
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366 // not the aligned up expanded region. |
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367 // jbyte* const end = byte_after(new_region.last()); |
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368 jbyte* const end = (jbyte*) new_end_for_commit; |
|
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369 assert((end >= byte_after(new_region.last())) || collided || guarded, |
|
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370 "Expect to be beyond new region unless impacting another region"); |
| 0 | 371 // do nothing if we resized downward. |
|
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372 #ifdef ASSERT |
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373 for (int ri = 0; ri < _cur_covered_regions; ri++) { |
|
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374 if (ri != ind) { |
|
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375 // The end of the new committed region should not |
|
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376 // be in any existing region unless it matches |
|
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377 // the start of the next region. |
|
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378 assert(!_committed[ri].contains(end) || |
|
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379 (_committed[ri].start() == (HeapWord*) end), |
|
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380 "Overlapping committed regions"); |
|
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381 } |
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382 } |
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383 #endif |
| 0 | 384 if (entry < end) { |
| 385 memset(entry, clean_card, pointer_delta(end, entry, sizeof(jbyte))); | |
| 386 } | |
| 387 } | |
| 388 // In any case, the covered size changes. | |
| 389 _covered[ind].set_word_size(new_region.word_size()); | |
| 390 if (TraceCardTableModRefBS) { | |
| 391 gclog_or_tty->print_cr("CardTableModRefBS::resize_covered_region: "); | |
| 392 gclog_or_tty->print_cr(" " | |
| 393 " _covered[%d].start(): " INTPTR_FORMAT | |
| 394 " _covered[%d].last(): " INTPTR_FORMAT, | |
| 395 ind, _covered[ind].start(), | |
| 396 ind, _covered[ind].last()); | |
| 397 gclog_or_tty->print_cr(" " | |
| 398 " _committed[%d].start(): " INTPTR_FORMAT | |
| 399 " _committed[%d].last(): " INTPTR_FORMAT, | |
| 400 ind, _committed[ind].start(), | |
| 401 ind, _committed[ind].last()); | |
| 402 gclog_or_tty->print_cr(" " | |
| 403 " byte_for(start): " INTPTR_FORMAT | |
| 404 " byte_for(last): " INTPTR_FORMAT, | |
| 405 byte_for(_covered[ind].start()), | |
| 406 byte_for(_covered[ind].last())); | |
| 407 gclog_or_tty->print_cr(" " | |
| 408 " addr_for(start): " INTPTR_FORMAT | |
| 409 " addr_for(last): " INTPTR_FORMAT, | |
| 410 addr_for((jbyte*) _committed[ind].start()), | |
| 411 addr_for((jbyte*) _committed[ind].last())); | |
| 412 } | |
|
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413 // Touch the last card of the covered region to show that it |
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414 // is committed (or SEGV). |
|
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415 debug_only((void) (*byte_for(_covered[ind].last()));) |
| 0 | 416 debug_only(verify_guard();) |
| 417 } | |
| 418 | |
| 419 // Note that these versions are precise! The scanning code has to handle the | |
| 420 // fact that the write barrier may be either precise or imprecise. | |
| 421 | |
|
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422 void CardTableModRefBS::write_ref_field_work(void* field, oop newVal) { |
| 0 | 423 inline_write_ref_field(field, newVal); |
| 424 } | |
| 425 | |
|
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426 /* |
|
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427 Claimed and deferred bits are used together in G1 during the evacuation |
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428 pause. These bits can have the following state transitions: |
|
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429 1. The claimed bit can be put over any other card state. Except that |
|
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430 the "dirty -> dirty and claimed" transition is checked for in |
|
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431 G1 code and is not used. |
|
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432 2. Deferred bit can be set only if the previous state of the card |
|
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433 was either clean or claimed. mark_card_deferred() is wait-free. |
|
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434 We do not care if the operation is be successful because if |
|
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435 it does not it will only result in duplicate entry in the update |
|
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436 buffer because of the "cache-miss". So it's not worth spinning. |
|
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437 */ |
|
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438 |
| 0 | 439 |
|
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|
440 bool CardTableModRefBS::claim_card(size_t card_index) { |
|
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441 jbyte val = _byte_map[card_index]; |
|
616
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442 assert(val != dirty_card_val(), "Shouldn't claim a dirty card"); |
|
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443 while (val == clean_card_val() || |
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444 (val & (clean_card_mask_val() | claimed_card_val())) != claimed_card_val()) { |
|
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445 jbyte new_val = val; |
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446 if (val == clean_card_val()) { |
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447 new_val = (jbyte)claimed_card_val(); |
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448 } else { |
|
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449 new_val = val | (jbyte)claimed_card_val(); |
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450 } |
|
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451 jbyte res = Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
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452 if (res == val) { |
|
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453 return true; |
|
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454 } |
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455 val = res; |
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456 } |
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457 return false; |
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458 } |
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459 |
|
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460 bool CardTableModRefBS::mark_card_deferred(size_t card_index) { |
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461 jbyte val = _byte_map[card_index]; |
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462 // It's already processed |
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463 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
|
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464 return false; |
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465 } |
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466 // Cached bit can be installed either on a clean card or on a claimed card. |
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467 jbyte new_val = val; |
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468 if (val == clean_card_val()) { |
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469 new_val = (jbyte)deferred_card_val(); |
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470 } else { |
|
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471 if (val & claimed_card_val()) { |
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472 new_val = val | (jbyte)deferred_card_val(); |
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473 } |
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474 } |
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475 if (new_val != val) { |
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476 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
|
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477 } |
|
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478 return true; |
|
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479 } |
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480 |
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481 void CardTableModRefBS::non_clean_card_iterate_possibly_parallel(Space* sp, |
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482 MemRegion mr, |
|
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483 OopsInGenClosure* cl, |
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484 CardTableRS* ct) { |
| 0 | 485 if (!mr.is_empty()) { |
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486 // Caller (process_strong_roots()) claims that all GC threads |
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487 // execute this call. With UseDynamicNumberOfGCThreads now all |
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488 // active GC threads execute this call. The number of active GC |
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489 // threads needs to be passed to par_non_clean_card_iterate_work() |
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490 // to get proper partitioning and termination. |
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491 // |
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492 // This is an example of where n_par_threads() is used instead |
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493 // of workers()->active_workers(). n_par_threads can be set to 0 to |
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494 // turn off parallelism. For example when this code is called as |
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495 // part of verification and SharedHeap::process_strong_roots() is being |
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496 // used, then n_par_threads() may have been set to 0. active_workers |
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497 // is not overloaded with the meaning that it is a switch to disable |
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498 // parallelism and so keeps the meaning of the number of |
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499 // active gc workers. If parallelism has not been shut off by |
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500 // setting n_par_threads to 0, then n_par_threads should be |
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501 // equal to active_workers. When a different mechanism for shutting |
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502 // off parallelism is used, then active_workers can be used in |
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503 // place of n_par_threads. |
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504 // This is an example of a path where n_par_threads is |
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505 // set to 0 to turn off parallism. |
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506 // [7] CardTableModRefBS::non_clean_card_iterate() |
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507 // [8] CardTableRS::younger_refs_in_space_iterate() |
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508 // [9] Generation::younger_refs_in_space_iterate() |
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509 // [10] OneContigSpaceCardGeneration::younger_refs_iterate() |
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510 // [11] CompactingPermGenGen::younger_refs_iterate() |
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511 // [12] CardTableRS::younger_refs_iterate() |
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512 // [13] SharedHeap::process_strong_roots() |
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513 // [14] G1CollectedHeap::verify() |
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514 // [15] Universe::verify() |
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515 // [16] G1CollectedHeap::do_collection_pause_at_safepoint() |
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516 // |
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517 int n_threads = SharedHeap::heap()->n_par_threads(); |
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518 bool is_par = n_threads > 0; |
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519 if (is_par) { |
|
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520 #if INCLUDE_ALL_GCS |
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521 assert(SharedHeap::heap()->n_par_threads() == |
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522 SharedHeap::heap()->workers()->active_workers(), "Mismatch"); |
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523 non_clean_card_iterate_parallel_work(sp, mr, cl, ct, n_threads); |
|
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524 #else // INCLUDE_ALL_GCS |
| 0 | 525 fatal("Parallel gc not supported here."); |
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526 #endif // INCLUDE_ALL_GCS |
| 0 | 527 } else { |
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528 // We do not call the non_clean_card_iterate_serial() version below because |
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529 // we want to clear the cards (which non_clean_card_iterate_serial() does not |
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530 // do for us): clear_cl here does the work of finding contiguous dirty ranges |
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531 // of cards to process and clear. |
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532 |
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533 DirtyCardToOopClosure* dcto_cl = sp->new_dcto_cl(cl, precision(), |
|
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534 cl->gen_boundary()); |
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535 ClearNoncleanCardWrapper clear_cl(dcto_cl, ct); |
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536 |
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537 clear_cl.do_MemRegion(mr); |
| 0 | 538 } |
| 539 } | |
| 540 } | |
| 541 | |
|
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542 // The iterator itself is not MT-aware, but |
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543 // MT-aware callers and closures can use this to |
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544 // accomplish dirty card iteration in parallel. The |
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545 // iterator itself does not clear the dirty cards, or |
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546 // change their values in any manner. |
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547 void CardTableModRefBS::non_clean_card_iterate_serial(MemRegion mr, |
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548 MemRegionClosure* cl) { |
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549 bool is_par = (SharedHeap::heap()->n_par_threads() > 0); |
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550 assert(!is_par || |
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551 (SharedHeap::heap()->n_par_threads() == |
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552 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
| 0 | 553 for (int i = 0; i < _cur_covered_regions; i++) { |
| 554 MemRegion mri = mr.intersection(_covered[i]); | |
| 555 if (mri.word_size() > 0) { | |
| 556 jbyte* cur_entry = byte_for(mri.last()); | |
| 557 jbyte* limit = byte_for(mri.start()); | |
| 558 while (cur_entry >= limit) { | |
| 559 jbyte* next_entry = cur_entry - 1; | |
| 560 if (*cur_entry != clean_card) { | |
| 561 size_t non_clean_cards = 1; | |
| 562 // Should the next card be included in this range of dirty cards. | |
| 563 while (next_entry >= limit && *next_entry != clean_card) { | |
| 564 non_clean_cards++; | |
| 565 cur_entry = next_entry; | |
| 566 next_entry--; | |
| 567 } | |
| 568 // The memory region may not be on a card boundary. So that | |
| 569 // objects beyond the end of the region are not processed, make | |
| 570 // cur_cards precise with regard to the end of the memory region. | |
| 571 MemRegion cur_cards(addr_for(cur_entry), | |
| 572 non_clean_cards * card_size_in_words); | |
| 573 MemRegion dirty_region = cur_cards.intersection(mri); | |
| 574 cl->do_MemRegion(dirty_region); | |
| 575 } | |
| 576 cur_entry = next_entry; | |
| 577 } | |
| 578 } | |
| 579 } | |
| 580 } | |
| 581 | |
| 582 void CardTableModRefBS::dirty_MemRegion(MemRegion mr) { | |
|
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583 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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584 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
| 0 | 585 jbyte* cur = byte_for(mr.start()); |
| 586 jbyte* last = byte_after(mr.last()); | |
| 587 while (cur < last) { | |
| 588 *cur = dirty_card; | |
| 589 cur++; | |
| 590 } | |
| 591 } | |
| 592 | |
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593 void CardTableModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
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594 assert((HeapWord*)align_size_down((uintptr_t)mr.start(), HeapWordSize) == mr.start(), "Unaligned start"); |
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595 assert((HeapWord*)align_size_up ((uintptr_t)mr.end(), HeapWordSize) == mr.end(), "Unaligned end" ); |
| 0 | 596 for (int i = 0; i < _cur_covered_regions; i++) { |
| 597 MemRegion mri = mr.intersection(_covered[i]); | |
| 598 if (!mri.is_empty()) dirty_MemRegion(mri); | |
| 599 } | |
| 600 } | |
| 601 | |
| 602 void CardTableModRefBS::clear_MemRegion(MemRegion mr) { | |
| 603 // Be conservative: only clean cards entirely contained within the | |
| 604 // region. | |
| 605 jbyte* cur; | |
| 606 if (mr.start() == _whole_heap.start()) { | |
| 607 cur = byte_for(mr.start()); | |
| 608 } else { | |
| 609 assert(mr.start() > _whole_heap.start(), "mr is not covered."); | |
| 610 cur = byte_after(mr.start() - 1); | |
| 611 } | |
| 612 jbyte* last = byte_after(mr.last()); | |
| 613 memset(cur, clean_card, pointer_delta(last, cur, sizeof(jbyte))); | |
| 614 } | |
| 615 | |
| 616 void CardTableModRefBS::clear(MemRegion mr) { | |
| 617 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 618 MemRegion mri = mr.intersection(_covered[i]); | |
| 619 if (!mri.is_empty()) clear_MemRegion(mri); | |
| 620 } | |
| 621 } | |
| 622 | |
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623 void CardTableModRefBS::dirty(MemRegion mr) { |
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624 jbyte* first = byte_for(mr.start()); |
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625 jbyte* last = byte_after(mr.last()); |
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626 memset(first, dirty_card, last-first); |
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627 } |
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628 |
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629 // Unlike several other card table methods, dirty_card_iterate() |
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630 // iterates over dirty cards ranges in increasing address order. |
| 0 | 631 void CardTableModRefBS::dirty_card_iterate(MemRegion mr, |
| 632 MemRegionClosure* cl) { | |
| 633 for (int i = 0; i < _cur_covered_regions; i++) { | |
| 634 MemRegion mri = mr.intersection(_covered[i]); | |
| 635 if (!mri.is_empty()) { | |
| 636 jbyte *cur_entry, *next_entry, *limit; | |
| 637 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
| 638 cur_entry <= limit; | |
| 639 cur_entry = next_entry) { | |
| 640 next_entry = cur_entry + 1; | |
| 641 if (*cur_entry == dirty_card) { | |
| 642 size_t dirty_cards; | |
| 643 // Accumulate maximal dirty card range, starting at cur_entry | |
| 644 for (dirty_cards = 1; | |
| 645 next_entry <= limit && *next_entry == dirty_card; | |
| 646 dirty_cards++, next_entry++); | |
| 647 MemRegion cur_cards(addr_for(cur_entry), | |
| 648 dirty_cards*card_size_in_words); | |
| 649 cl->do_MemRegion(cur_cards); | |
| 650 } | |
| 651 } | |
| 652 } | |
| 653 } | |
| 654 } | |
| 655 | |
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656 MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr, |
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657 bool reset, |
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658 int reset_val) { |
| 0 | 659 for (int i = 0; i < _cur_covered_regions; i++) { |
| 660 MemRegion mri = mr.intersection(_covered[i]); | |
| 661 if (!mri.is_empty()) { | |
| 662 jbyte* cur_entry, *next_entry, *limit; | |
| 663 for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last()); | |
| 664 cur_entry <= limit; | |
| 665 cur_entry = next_entry) { | |
| 666 next_entry = cur_entry + 1; | |
| 667 if (*cur_entry == dirty_card) { | |
| 668 size_t dirty_cards; | |
| 669 // Accumulate maximal dirty card range, starting at cur_entry | |
| 670 for (dirty_cards = 1; | |
| 671 next_entry <= limit && *next_entry == dirty_card; | |
| 672 dirty_cards++, next_entry++); | |
| 673 MemRegion cur_cards(addr_for(cur_entry), | |
| 674 dirty_cards*card_size_in_words); | |
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675 if (reset) { |
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676 for (size_t i = 0; i < dirty_cards; i++) { |
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677 cur_entry[i] = reset_val; |
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678 } |
| 0 | 679 } |
| 680 return cur_cards; | |
| 681 } | |
| 682 } | |
| 683 } | |
| 684 } | |
| 685 return MemRegion(mr.end(), mr.end()); | |
| 686 } | |
| 687 | |
| 688 uintx CardTableModRefBS::ct_max_alignment_constraint() { | |
| 689 return card_size * os::vm_page_size(); | |
| 690 } | |
| 691 | |
| 692 void CardTableModRefBS::verify_guard() { | |
| 693 // For product build verification | |
| 694 guarantee(_byte_map[_guard_index] == last_card, | |
| 695 "card table guard has been modified"); | |
| 696 } | |
| 697 | |
| 698 void CardTableModRefBS::verify() { | |
| 699 verify_guard(); | |
| 700 } | |
| 701 | |
| 702 #ifndef PRODUCT | |
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703 void CardTableModRefBS::verify_region(MemRegion mr, |
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704 jbyte val, bool val_equals) { |
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705 jbyte* start = byte_for(mr.start()); |
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706 jbyte* end = byte_for(mr.last()); |
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707 bool failures = false; |
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708 for (jbyte* curr = start; curr <= end; ++curr) { |
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709 jbyte curr_val = *curr; |
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710 bool failed = (val_equals) ? (curr_val != val) : (curr_val == val); |
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711 if (failed) { |
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712 if (!failures) { |
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713 tty->cr(); |
| 8668 | 714 tty->print_cr("== CT verification failed: ["PTR_FORMAT","PTR_FORMAT"]", start, end); |
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715 tty->print_cr("== %sexpecting value: %d", |
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716 (val_equals) ? "" : "not ", val); |
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717 failures = true; |
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718 } |
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719 tty->print_cr("== card "PTR_FORMAT" ["PTR_FORMAT","PTR_FORMAT"], " |
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720 "val: %d", curr, addr_for(curr), |
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721 (HeapWord*) (((size_t) addr_for(curr)) + card_size), |
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722 (int) curr_val); |
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723 } |
| 0 | 724 } |
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725 guarantee(!failures, "there should not have been any failures"); |
| 0 | 726 } |
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727 |
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728 void CardTableModRefBS::verify_not_dirty_region(MemRegion mr) { |
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729 verify_region(mr, dirty_card, false /* val_equals */); |
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730 } |
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731 |
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732 void CardTableModRefBS::verify_dirty_region(MemRegion mr) { |
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733 verify_region(mr, dirty_card, true /* val_equals */); |
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734 } |
| 0 | 735 #endif |
| 736 | |
| 5984 | 737 void CardTableModRefBS::print_on(outputStream* st) const { |
| 738 st->print_cr("Card table byte_map: [" INTPTR_FORMAT "," INTPTR_FORMAT "] byte_map_base: " INTPTR_FORMAT, | |
| 739 _byte_map, _byte_map + _byte_map_size, byte_map_base); | |
| 740 } | |
| 741 | |
| 0 | 742 bool CardTableModRefBSForCTRS::card_will_be_scanned(jbyte cv) { |
| 743 return | |
| 744 CardTableModRefBS::card_will_be_scanned(cv) || | |
| 745 _rs->is_prev_nonclean_card_val(cv); | |
| 746 }; | |
| 747 | |
| 748 bool CardTableModRefBSForCTRS::card_may_have_been_dirty(jbyte cv) { | |
| 749 return | |
| 750 cv != clean_card && | |
| 751 (CardTableModRefBS::card_may_have_been_dirty(cv) || | |
| 752 CardTableRS::youngergen_may_have_been_dirty(cv)); | |
| 753 }; |