Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/sparsePRT.cpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
author | mgerdin |
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date | Thu, 09 Oct 2014 15:42:23 +0200 |
parents | 55fb97c4c58d |
children | 4ca6dc0799b6 828056cf311f |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/heapRegion.hpp" | |
27 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
28 #include "gc_implementation/g1/sparsePRT.hpp" | |
29 #include "memory/allocation.inline.hpp" | |
30 #include "memory/cardTableModRefBS.hpp" | |
31 #include "memory/space.inline.hpp" | |
32 #include "runtime/mutexLocker.hpp" | |
342 | 33 |
34 #define SPARSE_PRT_VERBOSE 0 | |
35 | |
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36 #define UNROLL_CARD_LOOPS 1 |
342 | 37 |
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38 void SparsePRTEntry::init(RegionIdx_t region_ind) { |
342 | 39 _region_ind = region_ind; |
40 _next_index = NullEntry; | |
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41 |
342 | 42 #if UNROLL_CARD_LOOPS |
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43 assert((cards_num() & (UnrollFactor - 1)) == 0, "Invalid number of cards in the entry"); |
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44 for (int i = 0; i < cards_num(); i += UnrollFactor) { |
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45 _cards[i] = NullEntry; |
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46 _cards[i + 1] = NullEntry; |
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47 _cards[i + 2] = NullEntry; |
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48 _cards[i + 3] = NullEntry; |
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49 } |
342 | 50 #else |
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51 for (int i = 0; i < cards_num(); i++) |
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52 _cards[i] = NullEntry; |
342 | 53 #endif |
54 } | |
55 | |
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56 bool SparsePRTEntry::contains_card(CardIdx_t card_index) const { |
342 | 57 #if UNROLL_CARD_LOOPS |
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58 assert((cards_num() & (UnrollFactor - 1)) == 0, "Invalid number of cards in the entry"); |
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59 for (int i = 0; i < cards_num(); i += UnrollFactor) { |
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60 if (_cards[i] == card_index || |
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61 _cards[i + 1] == card_index || |
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62 _cards[i + 2] == card_index || |
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63 _cards[i + 3] == card_index) return true; |
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64 } |
342 | 65 #else |
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66 for (int i = 0; i < cards_num(); i++) { |
342 | 67 if (_cards[i] == card_index) return true; |
68 } | |
69 #endif | |
70 // Otherwise, we're full. | |
71 return false; | |
72 } | |
73 | |
74 int SparsePRTEntry::num_valid_cards() const { | |
75 int sum = 0; | |
76 #if UNROLL_CARD_LOOPS | |
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77 assert((cards_num() & (UnrollFactor - 1)) == 0, "Invalid number of cards in the entry"); |
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78 for (int i = 0; i < cards_num(); i += UnrollFactor) { |
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79 sum += (_cards[i] != NullEntry); |
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80 sum += (_cards[i + 1] != NullEntry); |
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81 sum += (_cards[i + 2] != NullEntry); |
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82 sum += (_cards[i + 3] != NullEntry); |
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83 } |
342 | 84 #else |
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85 for (int i = 0; i < cards_num(); i++) { |
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86 sum += (_cards[i] != NullEntry); |
342 | 87 } |
88 #endif | |
89 // Otherwise, we're full. | |
90 return sum; | |
91 } | |
92 | |
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93 SparsePRTEntry::AddCardResult SparsePRTEntry::add_card(CardIdx_t card_index) { |
342 | 94 #if UNROLL_CARD_LOOPS |
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95 assert((cards_num() & (UnrollFactor - 1)) == 0, "Invalid number of cards in the entry"); |
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96 CardIdx_t c; |
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97 for (int i = 0; i < cards_num(); i += UnrollFactor) { |
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98 c = _cards[i]; |
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99 if (c == card_index) return found; |
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100 if (c == NullEntry) { _cards[i] = card_index; return added; } |
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101 c = _cards[i + 1]; |
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102 if (c == card_index) return found; |
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103 if (c == NullEntry) { _cards[i + 1] = card_index; return added; } |
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104 c = _cards[i + 2]; |
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105 if (c == card_index) return found; |
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106 if (c == NullEntry) { _cards[i + 2] = card_index; return added; } |
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107 c = _cards[i + 3]; |
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108 if (c == card_index) return found; |
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109 if (c == NullEntry) { _cards[i + 3] = card_index; return added; } |
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110 } |
342 | 111 #else |
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112 for (int i = 0; i < cards_num(); i++) { |
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113 CardIdx_t c = _cards[i]; |
342 | 114 if (c == card_index) return found; |
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115 if (c == NullEntry) { _cards[i] = card_index; return added; } |
342 | 116 } |
117 #endif | |
118 // Otherwise, we're full. | |
119 return overflow; | |
120 } | |
121 | |
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122 void SparsePRTEntry::copy_cards(CardIdx_t* cards) const { |
342 | 123 #if UNROLL_CARD_LOOPS |
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124 assert((cards_num() & (UnrollFactor - 1)) == 0, "Invalid number of cards in the entry"); |
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125 for (int i = 0; i < cards_num(); i += UnrollFactor) { |
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126 cards[i] = _cards[i]; |
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127 cards[i + 1] = _cards[i + 1]; |
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128 cards[i + 2] = _cards[i + 2]; |
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129 cards[i + 3] = _cards[i + 3]; |
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130 } |
342 | 131 #else |
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132 for (int i = 0; i < cards_num(); i++) { |
342 | 133 cards[i] = _cards[i]; |
134 } | |
135 #endif | |
136 } | |
137 | |
138 void SparsePRTEntry::copy_cards(SparsePRTEntry* e) const { | |
139 copy_cards(&e->_cards[0]); | |
140 } | |
141 | |
142 // ---------------------------------------------------------------------- | |
143 | |
144 RSHashTable::RSHashTable(size_t capacity) : | |
145 _capacity(capacity), _capacity_mask(capacity-1), | |
146 _occupied_entries(0), _occupied_cards(0), | |
6197 | 147 _entries((SparsePRTEntry*)NEW_C_HEAP_ARRAY(char, SparsePRTEntry::size() * capacity, mtGC)), |
148 _buckets(NEW_C_HEAP_ARRAY(int, capacity, mtGC)), | |
342 | 149 _free_list(NullEntry), _free_region(0) |
150 { | |
151 clear(); | |
152 } | |
153 | |
154 RSHashTable::~RSHashTable() { | |
155 if (_entries != NULL) { | |
6197 | 156 FREE_C_HEAP_ARRAY(SparsePRTEntry, _entries, mtGC); |
342 | 157 _entries = NULL; |
158 } | |
159 if (_buckets != NULL) { | |
6197 | 160 FREE_C_HEAP_ARRAY(int, _buckets, mtGC); |
342 | 161 _buckets = NULL; |
162 } | |
163 } | |
164 | |
165 void RSHashTable::clear() { | |
166 _occupied_entries = 0; | |
167 _occupied_cards = 0; | |
168 guarantee(_entries != NULL, "INV"); | |
169 guarantee(_buckets != NULL, "INV"); | |
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170 |
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171 guarantee(_capacity <= ((size_t)1 << (sizeof(int)*BitsPerByte-1)) - 1, |
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172 "_capacity too large"); |
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173 |
342 | 174 // This will put -1 == NullEntry in the key field of all entries. |
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175 memset(_entries, NullEntry, _capacity * SparsePRTEntry::size()); |
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176 memset(_buckets, NullEntry, _capacity * sizeof(int)); |
342 | 177 _free_list = NullEntry; |
178 _free_region = 0; | |
179 } | |
180 | |
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181 bool RSHashTable::add_card(RegionIdx_t region_ind, CardIdx_t card_index) { |
342 | 182 SparsePRTEntry* e = entry_for_region_ind_create(region_ind); |
183 assert(e != NULL && e->r_ind() == region_ind, | |
184 "Postcondition of call above."); | |
185 SparsePRTEntry::AddCardResult res = e->add_card(card_index); | |
186 if (res == SparsePRTEntry::added) _occupied_cards++; | |
187 #if SPARSE_PRT_VERBOSE | |
188 gclog_or_tty->print_cr(" after add_card[%d]: valid-cards = %d.", | |
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189 pointer_delta(e, _entries, SparsePRTEntry::size()), |
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190 e->num_valid_cards()); |
342 | 191 #endif |
192 assert(e->num_valid_cards() > 0, "Postcondition"); | |
193 return res != SparsePRTEntry::overflow; | |
194 } | |
195 | |
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196 bool RSHashTable::get_cards(RegionIdx_t region_ind, CardIdx_t* cards) { |
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197 int ind = (int) (region_ind & capacity_mask()); |
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198 int cur_ind = _buckets[ind]; |
342 | 199 SparsePRTEntry* cur; |
200 while (cur_ind != NullEntry && | |
201 (cur = entry(cur_ind))->r_ind() != region_ind) { | |
202 cur_ind = cur->next_index(); | |
203 } | |
204 | |
205 if (cur_ind == NullEntry) return false; | |
206 // Otherwise... | |
207 assert(cur->r_ind() == region_ind, "Postcondition of loop + test above."); | |
208 assert(cur->num_valid_cards() > 0, "Inv"); | |
209 cur->copy_cards(cards); | |
210 return true; | |
211 } | |
212 | |
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213 SparsePRTEntry* RSHashTable::get_entry(RegionIdx_t region_ind) { |
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214 int ind = (int) (region_ind & capacity_mask()); |
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215 int cur_ind = _buckets[ind]; |
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216 SparsePRTEntry* cur; |
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217 while (cur_ind != NullEntry && |
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218 (cur = entry(cur_ind))->r_ind() != region_ind) { |
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219 cur_ind = cur->next_index(); |
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220 } |
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221 |
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222 if (cur_ind == NullEntry) return NULL; |
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223 // Otherwise... |
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224 assert(cur->r_ind() == region_ind, "Postcondition of loop + test above."); |
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225 assert(cur->num_valid_cards() > 0, "Inv"); |
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226 return cur; |
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227 } |
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228 |
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229 bool RSHashTable::delete_entry(RegionIdx_t region_ind) { |
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230 int ind = (int) (region_ind & capacity_mask()); |
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231 int* prev_loc = &_buckets[ind]; |
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232 int cur_ind = *prev_loc; |
342 | 233 SparsePRTEntry* cur; |
234 while (cur_ind != NullEntry && | |
235 (cur = entry(cur_ind))->r_ind() != region_ind) { | |
236 prev_loc = cur->next_index_addr(); | |
237 cur_ind = *prev_loc; | |
238 } | |
239 | |
240 if (cur_ind == NullEntry) return false; | |
241 // Otherwise, splice out "cur". | |
242 *prev_loc = cur->next_index(); | |
243 _occupied_cards -= cur->num_valid_cards(); | |
244 free_entry(cur_ind); | |
245 _occupied_entries--; | |
246 return true; | |
247 } | |
248 | |
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249 SparsePRTEntry* |
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250 RSHashTable::entry_for_region_ind(RegionIdx_t region_ind) const { |
342 | 251 assert(occupied_entries() < capacity(), "Precondition"); |
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252 int ind = (int) (region_ind & capacity_mask()); |
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253 int cur_ind = _buckets[ind]; |
342 | 254 SparsePRTEntry* cur; |
255 while (cur_ind != NullEntry && | |
256 (cur = entry(cur_ind))->r_ind() != region_ind) { | |
257 cur_ind = cur->next_index(); | |
258 } | |
259 | |
260 if (cur_ind != NullEntry) { | |
261 assert(cur->r_ind() == region_ind, "Loop postcondition + test"); | |
262 return cur; | |
263 } else { | |
264 return NULL; | |
265 } | |
266 } | |
267 | |
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268 SparsePRTEntry* |
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269 RSHashTable::entry_for_region_ind_create(RegionIdx_t region_ind) { |
342 | 270 SparsePRTEntry* res = entry_for_region_ind(region_ind); |
271 if (res == NULL) { | |
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272 int new_ind = alloc_entry(); |
342 | 273 assert(0 <= new_ind && (size_t)new_ind < capacity(), "There should be room."); |
274 res = entry(new_ind); | |
275 res->init(region_ind); | |
276 // Insert at front. | |
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277 int ind = (int) (region_ind & capacity_mask()); |
342 | 278 res->set_next_index(_buckets[ind]); |
279 _buckets[ind] = new_ind; | |
280 _occupied_entries++; | |
281 } | |
282 return res; | |
283 } | |
284 | |
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285 int RSHashTable::alloc_entry() { |
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286 int res; |
342 | 287 if (_free_list != NullEntry) { |
288 res = _free_list; | |
289 _free_list = entry(res)->next_index(); | |
290 return res; | |
291 } else if ((size_t) _free_region+1 < capacity()) { | |
292 res = _free_region; | |
293 _free_region++; | |
294 return res; | |
295 } else { | |
296 return NullEntry; | |
297 } | |
298 } | |
299 | |
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300 void RSHashTable::free_entry(int fi) { |
342 | 301 entry(fi)->set_next_index(_free_list); |
302 _free_list = fi; | |
303 } | |
304 | |
305 void RSHashTable::add_entry(SparsePRTEntry* e) { | |
306 assert(e->num_valid_cards() > 0, "Precondition."); | |
307 SparsePRTEntry* e2 = entry_for_region_ind_create(e->r_ind()); | |
308 e->copy_cards(e2); | |
309 _occupied_cards += e2->num_valid_cards(); | |
310 assert(e2->num_valid_cards() > 0, "Postcondition."); | |
311 } | |
312 | |
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313 CardIdx_t RSHashTableIter::find_first_card_in_list() { |
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314 CardIdx_t res; |
342 | 315 while (_bl_ind != RSHashTable::NullEntry) { |
316 res = _rsht->entry(_bl_ind)->card(0); | |
317 if (res != SparsePRTEntry::NullEntry) { | |
318 return res; | |
319 } else { | |
320 _bl_ind = _rsht->entry(_bl_ind)->next_index(); | |
321 } | |
322 } | |
323 // Otherwise, none found: | |
324 return SparsePRTEntry::NullEntry; | |
325 } | |
326 | |
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327 size_t RSHashTableIter::compute_card_ind(CardIdx_t ci) { |
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328 return (_rsht->entry(_bl_ind)->r_ind() * HeapRegion::CardsPerRegion) + ci; |
342 | 329 } |
330 | |
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331 bool RSHashTableIter::has_next(size_t& card_index) { |
342 | 332 _card_ind++; |
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333 CardIdx_t ci; |
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334 if (_card_ind < SparsePRTEntry::cards_num() && |
342 | 335 ((ci = _rsht->entry(_bl_ind)->card(_card_ind)) != |
336 SparsePRTEntry::NullEntry)) { | |
337 card_index = compute_card_ind(ci); | |
338 return true; | |
339 } | |
340 // Otherwise, must find the next valid entry. | |
341 _card_ind = 0; | |
342 | |
343 if (_bl_ind != RSHashTable::NullEntry) { | |
344 _bl_ind = _rsht->entry(_bl_ind)->next_index(); | |
345 ci = find_first_card_in_list(); | |
346 if (ci != SparsePRTEntry::NullEntry) { | |
347 card_index = compute_card_ind(ci); | |
348 return true; | |
349 } | |
350 } | |
351 // If we didn't return above, must go to the next non-null table index. | |
352 _tbl_ind++; | |
353 while ((size_t)_tbl_ind < _rsht->capacity()) { | |
354 _bl_ind = _rsht->_buckets[_tbl_ind]; | |
355 ci = find_first_card_in_list(); | |
356 if (ci != SparsePRTEntry::NullEntry) { | |
357 card_index = compute_card_ind(ci); | |
358 return true; | |
359 } | |
360 // Otherwise, try next entry. | |
361 _tbl_ind++; | |
362 } | |
363 // Otherwise, there were no entry. | |
364 return false; | |
365 } | |
366 | |
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367 bool RSHashTable::contains_card(RegionIdx_t region_index, CardIdx_t card_index) const { |
342 | 368 SparsePRTEntry* e = entry_for_region_ind(region_index); |
369 return (e != NULL && e->contains_card(card_index)); | |
370 } | |
371 | |
372 size_t RSHashTable::mem_size() const { | |
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373 return sizeof(this) + |
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374 capacity() * (SparsePRTEntry::size() + sizeof(int)); |
342 | 375 } |
376 | |
377 // ---------------------------------------------------------------------- | |
378 | |
379 SparsePRT* SparsePRT::_head_expanded_list = NULL; | |
380 | |
381 void SparsePRT::add_to_expanded_list(SparsePRT* sprt) { | |
382 // We could expand multiple times in a pause -- only put on list once. | |
383 if (sprt->expanded()) return; | |
384 sprt->set_expanded(true); | |
385 SparsePRT* hd = _head_expanded_list; | |
386 while (true) { | |
387 sprt->_next_expanded = hd; | |
388 SparsePRT* res = | |
389 (SparsePRT*) | |
390 Atomic::cmpxchg_ptr(sprt, &_head_expanded_list, hd); | |
391 if (res == hd) return; | |
392 else hd = res; | |
393 } | |
394 } | |
395 | |
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396 |
342 | 397 SparsePRT* SparsePRT::get_from_expanded_list() { |
398 SparsePRT* hd = _head_expanded_list; | |
399 while (hd != NULL) { | |
400 SparsePRT* next = hd->next_expanded(); | |
401 SparsePRT* res = | |
402 (SparsePRT*) | |
403 Atomic::cmpxchg_ptr(next, &_head_expanded_list, hd); | |
404 if (res == hd) { | |
405 hd->set_next_expanded(NULL); | |
406 return hd; | |
407 } else { | |
408 hd = res; | |
409 } | |
410 } | |
411 return NULL; | |
412 } | |
413 | |
2173 | 414 void SparsePRT::reset_for_cleanup_tasks() { |
415 _head_expanded_list = NULL; | |
416 } | |
417 | |
418 void SparsePRT::do_cleanup_work(SparsePRTCleanupTask* sprt_cleanup_task) { | |
419 if (should_be_on_expanded_list()) { | |
420 sprt_cleanup_task->add(this); | |
421 } | |
422 } | |
423 | |
424 void SparsePRT::finish_cleanup_task(SparsePRTCleanupTask* sprt_cleanup_task) { | |
425 assert(ParGCRareEvent_lock->owned_by_self(), "pre-condition"); | |
426 SparsePRT* head = sprt_cleanup_task->head(); | |
427 SparsePRT* tail = sprt_cleanup_task->tail(); | |
428 if (head != NULL) { | |
429 assert(tail != NULL, "if head is not NULL, so should tail"); | |
430 | |
431 tail->set_next_expanded(_head_expanded_list); | |
432 _head_expanded_list = head; | |
433 } else { | |
434 assert(tail == NULL, "if head is NULL, so should tail"); | |
435 } | |
436 } | |
437 | |
438 bool SparsePRT::should_be_on_expanded_list() { | |
439 if (_expanded) { | |
440 assert(_cur != _next, "if _expanded is true, cur should be != _next"); | |
441 } else { | |
442 assert(_cur == _next, "if _expanded is false, cur should be == _next"); | |
443 } | |
444 return expanded(); | |
445 } | |
342 | 446 |
447 void SparsePRT::cleanup_all() { | |
448 // First clean up all expanded tables so they agree on next and cur. | |
449 SparsePRT* sprt = get_from_expanded_list(); | |
450 while (sprt != NULL) { | |
451 sprt->cleanup(); | |
452 sprt = get_from_expanded_list(); | |
453 } | |
454 } | |
455 | |
456 | |
457 SparsePRT::SparsePRT(HeapRegion* hr) : | |
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458 _hr(hr), _expanded(false), _next_expanded(NULL) |
342 | 459 { |
460 _cur = new RSHashTable(InitialCapacity); | |
461 _next = _cur; | |
462 } | |
463 | |
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464 |
342 | 465 SparsePRT::~SparsePRT() { |
466 assert(_next != NULL && _cur != NULL, "Inv"); | |
467 if (_cur != _next) { delete _cur; } | |
468 delete _next; | |
469 } | |
470 | |
471 | |
472 size_t SparsePRT::mem_size() const { | |
473 // We ignore "_cur" here, because it either = _next, or else it is | |
474 // on the deleted list. | |
475 return sizeof(this) + _next->mem_size(); | |
476 } | |
477 | |
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478 bool SparsePRT::add_card(RegionIdx_t region_id, CardIdx_t card_index) { |
342 | 479 #if SPARSE_PRT_VERBOSE |
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480 gclog_or_tty->print_cr(" Adding card %d from region %d to region %u sparse.", |
3766 | 481 card_index, region_id, _hr->hrs_index()); |
342 | 482 #endif |
483 if (_next->occupied_entries() * 2 > _next->capacity()) { | |
484 expand(); | |
485 } | |
486 return _next->add_card(region_id, card_index); | |
487 } | |
488 | |
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489 bool SparsePRT::get_cards(RegionIdx_t region_id, CardIdx_t* cards) { |
342 | 490 return _next->get_cards(region_id, cards); |
491 } | |
492 | |
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493 SparsePRTEntry* SparsePRT::get_entry(RegionIdx_t region_id) { |
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494 return _next->get_entry(region_id); |
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495 } |
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496 |
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497 bool SparsePRT::delete_entry(RegionIdx_t region_id) { |
342 | 498 return _next->delete_entry(region_id); |
499 } | |
500 | |
501 void SparsePRT::clear() { | |
502 // If they differ, _next is bigger then cur, so next has no chance of | |
503 // being the initial size. | |
504 if (_next != _cur) { | |
505 delete _next; | |
506 } | |
507 | |
508 if (_cur->capacity() != InitialCapacity) { | |
509 delete _cur; | |
510 _cur = new RSHashTable(InitialCapacity); | |
511 } else { | |
512 _cur->clear(); | |
513 } | |
514 _next = _cur; | |
2173 | 515 _expanded = false; |
342 | 516 } |
517 | |
518 void SparsePRT::cleanup() { | |
1045 | 519 // Make sure that the current and next tables agree. |
520 if (_cur != _next) { | |
521 delete _cur; | |
522 } | |
342 | 523 _cur = _next; |
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524 set_expanded(false); |
342 | 525 } |
526 | |
527 void SparsePRT::expand() { | |
528 RSHashTable* last = _next; | |
529 _next = new RSHashTable(last->capacity() * 2); | |
530 | |
531 #if SPARSE_PRT_VERBOSE | |
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532 gclog_or_tty->print_cr(" Expanded sparse table for %u to %d.", |
3766 | 533 _hr->hrs_index(), _next->capacity()); |
342 | 534 #endif |
535 for (size_t i = 0; i < last->capacity(); i++) { | |
536 SparsePRTEntry* e = last->entry((int)i); | |
537 if (e->valid_entry()) { | |
538 #if SPARSE_PRT_VERBOSE | |
539 gclog_or_tty->print_cr(" During expansion, transferred entry for %d.", | |
540 e->r_ind()); | |
541 #endif | |
542 _next->add_entry(e); | |
543 } | |
544 } | |
1045 | 545 if (last != _cur) { |
546 delete last; | |
547 } | |
342 | 548 add_to_expanded_list(this); |
549 } | |
2173 | 550 |
551 void SparsePRTCleanupTask::add(SparsePRT* sprt) { | |
552 assert(sprt->should_be_on_expanded_list(), "pre-condition"); | |
553 | |
554 sprt->set_next_expanded(NULL); | |
555 if (_tail != NULL) { | |
556 _tail->set_next_expanded(sprt); | |
557 } else { | |
558 _head = sprt; | |
559 } | |
560 _tail = sprt; | |
561 } |