Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | f81a7c0c618d |
children | 746b070f5022 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
27 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
28 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
29 #include "gc_implementation/parallelScavenge/psTasks.hpp" | |
30 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "oops/oop.psgc.inline.hpp" | |
0 | 33 |
34 // Checks an individual oop for missing precise marks. Mark | |
35 // may be either dirty or newgen. | |
36 class CheckForUnmarkedOops : public OopClosure { | |
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37 private: |
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38 PSYoungGen* _young_gen; |
0 | 39 CardTableExtension* _card_table; |
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40 HeapWord* _unmarked_addr; |
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41 jbyte* _unmarked_card; |
0 | 42 |
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43 protected: |
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44 template <class T> void do_oop_work(T* p) { |
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45 oop obj = oopDesc::load_decode_heap_oop(p); |
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46 if (_young_gen->is_in_reserved(obj) && |
0 | 47 !_card_table->addr_is_marked_imprecise(p)) { |
48 // Don't overwrite the first missing card mark | |
49 if (_unmarked_addr == NULL) { | |
50 _unmarked_addr = (HeapWord*)p; | |
51 _unmarked_card = _card_table->byte_for(p); | |
52 } | |
53 } | |
54 } | |
55 | |
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56 public: |
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57 CheckForUnmarkedOops(PSYoungGen* young_gen, CardTableExtension* card_table) : |
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58 _young_gen(young_gen), _card_table(card_table), _unmarked_addr(NULL) { } |
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59 |
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60 virtual void do_oop(oop* p) { CheckForUnmarkedOops::do_oop_work(p); } |
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61 virtual void do_oop(narrowOop* p) { CheckForUnmarkedOops::do_oop_work(p); } |
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62 |
0 | 63 bool has_unmarked_oop() { |
64 return _unmarked_addr != NULL; | |
65 } | |
66 }; | |
67 | |
68 // Checks all objects for the existance of some type of mark, | |
69 // precise or imprecise, dirty or newgen. | |
70 class CheckForUnmarkedObjects : public ObjectClosure { | |
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71 private: |
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72 PSYoungGen* _young_gen; |
0 | 73 CardTableExtension* _card_table; |
74 | |
75 public: | |
76 CheckForUnmarkedObjects() { | |
77 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
78 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
79 | |
80 _young_gen = heap->young_gen(); | |
81 _card_table = (CardTableExtension*)heap->barrier_set(); | |
82 // No point in asserting barrier set type here. Need to make CardTableExtension | |
83 // a unique barrier set type. | |
84 } | |
85 | |
86 // Card marks are not precise. The current system can leave us with | |
605 | 87 // a mismash of precise marks and beginning of object marks. This means |
0 | 88 // we test for missing precise marks first. If any are found, we don't |
89 // fail unless the object head is also unmarked. | |
90 virtual void do_object(oop obj) { | |
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91 CheckForUnmarkedOops object_check(_young_gen, _card_table); |
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92 obj->oop_iterate_no_header(&object_check); |
0 | 93 if (object_check.has_unmarked_oop()) { |
94 assert(_card_table->addr_is_marked_imprecise(obj), "Found unmarked young_gen object"); | |
95 } | |
96 } | |
97 }; | |
98 | |
99 // Checks for precise marking of oops as newgen. | |
100 class CheckForPreciseMarks : public OopClosure { | |
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101 private: |
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102 PSYoungGen* _young_gen; |
0 | 103 CardTableExtension* _card_table; |
104 | |
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105 protected: |
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106 template <class T> void do_oop_work(T* p) { |
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107 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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108 if (_young_gen->is_in_reserved(obj)) { |
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109 assert(_card_table->addr_is_marked_precise(p), "Found unmarked precise oop"); |
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110 _card_table->set_card_newgen(p); |
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111 } |
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112 } |
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113 |
0 | 114 public: |
115 CheckForPreciseMarks( PSYoungGen* young_gen, CardTableExtension* card_table ) : | |
116 _young_gen(young_gen), _card_table(card_table) { } | |
117 | |
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118 virtual void do_oop(oop* p) { CheckForPreciseMarks::do_oop_work(p); } |
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119 virtual void do_oop(narrowOop* p) { CheckForPreciseMarks::do_oop_work(p); } |
0 | 120 }; |
121 | |
122 // We get passed the space_top value to prevent us from traversing into | |
123 // the old_gen promotion labs, which cannot be safely parsed. | |
124 | |
6817 | 125 // Do not call this method if the space is empty. |
126 // It is a waste to start tasks and get here only to | |
127 // do no work. If this method needs to be called | |
128 // when the space is empty, fix the calculation of | |
129 // end_card to allow sp_top == sp->bottom(). | |
0 | 130 |
131 void CardTableExtension::scavenge_contents_parallel(ObjectStartArray* start_array, | |
132 MutableSpace* sp, | |
133 HeapWord* space_top, | |
134 PSPromotionManager* pm, | |
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135 uint stripe_number, |
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136 uint stripe_total) { |
0 | 137 int ssize = 128; // Naked constant! Work unit = 64k. |
138 int dirty_card_count = 0; | |
139 | |
6817 | 140 // It is a waste to get here if empty. |
141 assert(sp->bottom() < sp->top(), "Should not be called if empty"); | |
0 | 142 oop* sp_top = (oop*)space_top; |
143 jbyte* start_card = byte_for(sp->bottom()); | |
6817 | 144 jbyte* end_card = byte_for(sp_top - 1) + 1; |
0 | 145 oop* last_scanned = NULL; // Prevent scanning objects more than once |
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146 // The width of the stripe ssize*stripe_total must be |
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147 // consistent with the number of stripes so that the complete slice |
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148 // is covered. |
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149 size_t slice_width = ssize * stripe_total; |
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150 for (jbyte* slice = start_card; slice < end_card; slice += slice_width) { |
0 | 151 jbyte* worker_start_card = slice + stripe_number * ssize; |
152 if (worker_start_card >= end_card) | |
153 return; // We're done. | |
154 | |
155 jbyte* worker_end_card = worker_start_card + ssize; | |
156 if (worker_end_card > end_card) | |
157 worker_end_card = end_card; | |
158 | |
159 // We do not want to scan objects more than once. In order to accomplish | |
160 // this, we assert that any object with an object head inside our 'slice' | |
161 // belongs to us. We may need to extend the range of scanned cards if the | |
162 // last object continues into the next 'slice'. | |
163 // | |
164 // Note! ending cards are exclusive! | |
165 HeapWord* slice_start = addr_for(worker_start_card); | |
166 HeapWord* slice_end = MIN2((HeapWord*) sp_top, addr_for(worker_end_card)); | |
167 | |
6817 | 168 #ifdef ASSERT |
169 if (GCWorkerDelayMillis > 0) { | |
170 // Delay 1 worker so that it proceeds after all the work | |
171 // has been completed. | |
172 if (stripe_number < 2) { | |
173 os::sleep(Thread::current(), GCWorkerDelayMillis, false); | |
174 } | |
175 } | |
176 #endif | |
177 | |
0 | 178 // If there are not objects starting within the chunk, skip it. |
179 if (!start_array->object_starts_in_range(slice_start, slice_end)) { | |
180 continue; | |
181 } | |
605 | 182 // Update our beginning addr |
0 | 183 HeapWord* first_object = start_array->object_start(slice_start); |
184 debug_only(oop* first_object_within_slice = (oop*) first_object;) | |
185 if (first_object < slice_start) { | |
186 last_scanned = (oop*)(first_object + oop(first_object)->size()); | |
187 debug_only(first_object_within_slice = last_scanned;) | |
188 worker_start_card = byte_for(last_scanned); | |
189 } | |
190 | |
191 // Update the ending addr | |
192 if (slice_end < (HeapWord*)sp_top) { | |
193 // The subtraction is important! An object may start precisely at slice_end. | |
194 HeapWord* last_object = start_array->object_start(slice_end - 1); | |
195 slice_end = last_object + oop(last_object)->size(); | |
196 // worker_end_card is exclusive, so bump it one past the end of last_object's | |
197 // covered span. | |
198 worker_end_card = byte_for(slice_end) + 1; | |
199 | |
200 if (worker_end_card > end_card) | |
201 worker_end_card = end_card; | |
202 } | |
203 | |
204 assert(slice_end <= (HeapWord*)sp_top, "Last object in slice crosses space boundary"); | |
205 assert(is_valid_card_address(worker_start_card), "Invalid worker start card"); | |
206 assert(is_valid_card_address(worker_end_card), "Invalid worker end card"); | |
207 // Note that worker_start_card >= worker_end_card is legal, and happens when | |
208 // an object spans an entire slice. | |
209 assert(worker_start_card <= end_card, "worker start card beyond end card"); | |
210 assert(worker_end_card <= end_card, "worker end card beyond end card"); | |
211 | |
212 jbyte* current_card = worker_start_card; | |
213 while (current_card < worker_end_card) { | |
214 // Find an unclean card. | |
215 while (current_card < worker_end_card && card_is_clean(*current_card)) { | |
216 current_card++; | |
217 } | |
218 jbyte* first_unclean_card = current_card; | |
219 | |
220 // Find the end of a run of contiguous unclean cards | |
221 while (current_card < worker_end_card && !card_is_clean(*current_card)) { | |
222 while (current_card < worker_end_card && !card_is_clean(*current_card)) { | |
223 current_card++; | |
224 } | |
225 | |
226 if (current_card < worker_end_card) { | |
227 // Some objects may be large enough to span several cards. If such | |
228 // an object has more than one dirty card, separated by a clean card, | |
229 // we will attempt to scan it twice. The test against "last_scanned" | |
230 // prevents the redundant object scan, but it does not prevent newly | |
231 // marked cards from being cleaned. | |
232 HeapWord* last_object_in_dirty_region = start_array->object_start(addr_for(current_card)-1); | |
233 size_t size_of_last_object = oop(last_object_in_dirty_region)->size(); | |
234 HeapWord* end_of_last_object = last_object_in_dirty_region + size_of_last_object; | |
235 jbyte* ending_card_of_last_object = byte_for(end_of_last_object); | |
236 assert(ending_card_of_last_object <= worker_end_card, "ending_card_of_last_object is greater than worker_end_card"); | |
237 if (ending_card_of_last_object > current_card) { | |
238 // This means the object spans the next complete card. | |
239 // We need to bump the current_card to ending_card_of_last_object | |
240 current_card = ending_card_of_last_object; | |
241 } | |
242 } | |
243 } | |
244 jbyte* following_clean_card = current_card; | |
245 | |
246 if (first_unclean_card < worker_end_card) { | |
247 oop* p = (oop*) start_array->object_start(addr_for(first_unclean_card)); | |
248 assert((HeapWord*)p <= addr_for(first_unclean_card), "checking"); | |
249 // "p" should always be >= "last_scanned" because newly GC dirtied | |
250 // cards are no longer scanned again (see comment at end | |
251 // of loop on the increment of "current_card"). Test that | |
252 // hypothesis before removing this code. | |
253 // If this code is removed, deal with the first time through | |
254 // the loop when the last_scanned is the object starting in | |
255 // the previous slice. | |
256 assert((p >= last_scanned) || | |
257 (last_scanned == first_object_within_slice), | |
258 "Should no longer be possible"); | |
259 if (p < last_scanned) { | |
260 // Avoid scanning more than once; this can happen because | |
261 // newgen cards set by GC may a different set than the | |
262 // originally dirty set | |
263 p = last_scanned; | |
264 } | |
265 oop* to = (oop*)addr_for(following_clean_card); | |
266 | |
267 // Test slice_end first! | |
268 if ((HeapWord*)to > slice_end) { | |
269 to = (oop*)slice_end; | |
270 } else if (to > sp_top) { | |
271 to = sp_top; | |
272 } | |
273 | |
274 // we know which cards to scan, now clear them | |
275 if (first_unclean_card <= worker_start_card+1) | |
276 first_unclean_card = worker_start_card+1; | |
277 if (following_clean_card >= worker_end_card-1) | |
278 following_clean_card = worker_end_card-1; | |
279 | |
280 while (first_unclean_card < following_clean_card) { | |
281 *first_unclean_card++ = clean_card; | |
282 } | |
283 | |
284 const int interval = PrefetchScanIntervalInBytes; | |
285 // scan all objects in the range | |
286 if (interval != 0) { | |
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287 while (p < to) { |
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288 Prefetch::write(p, interval); |
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289 oop m = oop(p); |
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290 assert(m->is_oop_or_null(), "check for header"); |
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291 m->push_contents(pm); |
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292 p += m->size(); |
0 | 293 } |
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294 pm->drain_stacks_cond_depth(); |
0 | 295 } else { |
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296 while (p < to) { |
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297 oop m = oop(p); |
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298 assert(m->is_oop_or_null(), "check for header"); |
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299 m->push_contents(pm); |
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300 p += m->size(); |
0 | 301 } |
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302 pm->drain_stacks_cond_depth(); |
0 | 303 } |
304 last_scanned = p; | |
305 } | |
306 // "current_card" is still the "following_clean_card" or | |
307 // the current_card is >= the worker_end_card so the | |
308 // loop will not execute again. | |
309 assert((current_card == following_clean_card) || | |
310 (current_card >= worker_end_card), | |
311 "current_card should only be incremented if it still equals " | |
312 "following_clean_card"); | |
313 // Increment current_card so that it is not processed again. | |
314 // It may now be dirty because a old-to-young pointer was | |
315 // found on it an updated. If it is now dirty, it cannot be | |
316 // be safely cleaned in the next iteration. | |
317 current_card++; | |
318 } | |
319 } | |
320 } | |
321 | |
322 // This should be called before a scavenge. | |
323 void CardTableExtension::verify_all_young_refs_imprecise() { | |
324 CheckForUnmarkedObjects check; | |
325 | |
326 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
327 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
328 | |
329 PSOldGen* old_gen = heap->old_gen(); | |
330 | |
331 old_gen->object_iterate(&check); | |
332 } | |
333 | |
334 // This should be called immediately after a scavenge, before mutators resume. | |
335 void CardTableExtension::verify_all_young_refs_precise() { | |
336 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
337 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
338 | |
339 PSOldGen* old_gen = heap->old_gen(); | |
340 | |
341 CheckForPreciseMarks check(heap->young_gen(), (CardTableExtension*)heap->barrier_set()); | |
342 | |
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343 old_gen->oop_iterate_no_header(&check); |
0 | 344 |
345 verify_all_young_refs_precise_helper(old_gen->object_space()->used_region()); | |
346 } | |
347 | |
348 void CardTableExtension::verify_all_young_refs_precise_helper(MemRegion mr) { | |
349 CardTableExtension* card_table = (CardTableExtension*)Universe::heap()->barrier_set(); | |
350 // FIX ME ASSERT HERE | |
351 | |
352 jbyte* bot = card_table->byte_for(mr.start()); | |
353 jbyte* top = card_table->byte_for(mr.end()); | |
354 while(bot <= top) { | |
355 assert(*bot == clean_card || *bot == verify_card, "Found unwanted or unknown card mark"); | |
356 if (*bot == verify_card) | |
357 *bot = youngergen_card; | |
358 bot++; | |
359 } | |
360 } | |
361 | |
362 bool CardTableExtension::addr_is_marked_imprecise(void *addr) { | |
363 jbyte* p = byte_for(addr); | |
364 jbyte val = *p; | |
365 | |
366 if (card_is_dirty(val)) | |
367 return true; | |
368 | |
369 if (card_is_newgen(val)) | |
370 return true; | |
371 | |
372 if (card_is_clean(val)) | |
373 return false; | |
374 | |
375 assert(false, "Found unhandled card mark type"); | |
376 | |
377 return false; | |
378 } | |
379 | |
380 // Also includes verify_card | |
381 bool CardTableExtension::addr_is_marked_precise(void *addr) { | |
382 jbyte* p = byte_for(addr); | |
383 jbyte val = *p; | |
384 | |
385 if (card_is_newgen(val)) | |
386 return true; | |
387 | |
388 if (card_is_verify(val)) | |
389 return true; | |
390 | |
391 if (card_is_clean(val)) | |
392 return false; | |
393 | |
394 if (card_is_dirty(val)) | |
395 return false; | |
396 | |
397 assert(false, "Found unhandled card mark type"); | |
398 | |
399 return false; | |
400 } | |
401 | |
402 // Assumes that only the base or the end changes. This allows indentification | |
403 // of the region that is being resized. The | |
404 // CardTableModRefBS::resize_covered_region() is used for the normal case | |
405 // where the covered regions are growing or shrinking at the high end. | |
406 // The method resize_covered_region_by_end() is analogous to | |
407 // CardTableModRefBS::resize_covered_region() but | |
408 // for regions that grow or shrink at the low end. | |
409 void CardTableExtension::resize_covered_region(MemRegion new_region) { | |
410 | |
411 for (int i = 0; i < _cur_covered_regions; i++) { | |
412 if (_covered[i].start() == new_region.start()) { | |
413 // Found a covered region with the same start as the | |
414 // new region. The region is growing or shrinking | |
415 // from the start of the region. | |
416 resize_covered_region_by_start(new_region); | |
417 return; | |
418 } | |
419 if (_covered[i].start() > new_region.start()) { | |
420 break; | |
421 } | |
422 } | |
423 | |
424 int changed_region = -1; | |
425 for (int j = 0; j < _cur_covered_regions; j++) { | |
426 if (_covered[j].end() == new_region.end()) { | |
427 changed_region = j; | |
428 // This is a case where the covered region is growing or shrinking | |
429 // at the start of the region. | |
430 assert(changed_region != -1, "Don't expect to add a covered region"); | |
431 assert(_covered[changed_region].byte_size() != new_region.byte_size(), | |
432 "The sizes should be different here"); | |
433 resize_covered_region_by_end(changed_region, new_region); | |
434 return; | |
435 } | |
436 } | |
437 // This should only be a new covered region (where no existing | |
438 // covered region matches at the start or the end). | |
439 assert(_cur_covered_regions < _max_covered_regions, | |
440 "An existing region should have been found"); | |
441 resize_covered_region_by_start(new_region); | |
442 } | |
443 | |
444 void CardTableExtension::resize_covered_region_by_start(MemRegion new_region) { | |
445 CardTableModRefBS::resize_covered_region(new_region); | |
446 debug_only(verify_guard();) | |
447 } | |
448 | |
449 void CardTableExtension::resize_covered_region_by_end(int changed_region, | |
450 MemRegion new_region) { | |
451 assert(SafepointSynchronize::is_at_safepoint(), | |
452 "Only expect an expansion at the low end at a GC"); | |
453 debug_only(verify_guard();) | |
454 #ifdef ASSERT | |
455 for (int k = 0; k < _cur_covered_regions; k++) { | |
456 if (_covered[k].end() == new_region.end()) { | |
457 assert(changed_region == k, "Changed region is incorrect"); | |
458 break; | |
459 } | |
460 } | |
461 #endif | |
462 | |
463 // Commit new or uncommit old pages, if necessary. | |
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464 if (resize_commit_uncommit(changed_region, new_region)) { |
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465 // Set the new start of the committed region |
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466 resize_update_committed_table(changed_region, new_region); |
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467 } |
0 | 468 |
469 // Update card table entries | |
470 resize_update_card_table_entries(changed_region, new_region); | |
471 | |
472 // Update the covered region | |
473 resize_update_covered_table(changed_region, new_region); | |
474 | |
475 if (TraceCardTableModRefBS) { | |
476 int ind = changed_region; | |
477 gclog_or_tty->print_cr("CardTableModRefBS::resize_covered_region: "); | |
478 gclog_or_tty->print_cr(" " | |
479 " _covered[%d].start(): " INTPTR_FORMAT | |
480 " _covered[%d].last(): " INTPTR_FORMAT, | |
481 ind, _covered[ind].start(), | |
482 ind, _covered[ind].last()); | |
483 gclog_or_tty->print_cr(" " | |
484 " _committed[%d].start(): " INTPTR_FORMAT | |
485 " _committed[%d].last(): " INTPTR_FORMAT, | |
486 ind, _committed[ind].start(), | |
487 ind, _committed[ind].last()); | |
488 gclog_or_tty->print_cr(" " | |
489 " byte_for(start): " INTPTR_FORMAT | |
490 " byte_for(last): " INTPTR_FORMAT, | |
491 byte_for(_covered[ind].start()), | |
492 byte_for(_covered[ind].last())); | |
493 gclog_or_tty->print_cr(" " | |
494 " addr_for(start): " INTPTR_FORMAT | |
495 " addr_for(last): " INTPTR_FORMAT, | |
496 addr_for((jbyte*) _committed[ind].start()), | |
497 addr_for((jbyte*) _committed[ind].last())); | |
498 } | |
499 debug_only(verify_guard();) | |
500 } | |
501 | |
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502 bool CardTableExtension::resize_commit_uncommit(int changed_region, |
0 | 503 MemRegion new_region) { |
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504 bool result = false; |
0 | 505 // Commit new or uncommit old pages, if necessary. |
506 MemRegion cur_committed = _committed[changed_region]; | |
507 assert(_covered[changed_region].end() == new_region.end(), | |
508 "The ends of the regions are expected to match"); | |
509 // Extend the start of this _committed region to | |
510 // to cover the start of any previous _committed region. | |
511 // This forms overlapping regions, but never interior regions. | |
512 HeapWord* min_prev_start = lowest_prev_committed_start(changed_region); | |
513 if (min_prev_start < cur_committed.start()) { | |
514 // Only really need to set start of "cur_committed" to | |
515 // the new start (min_prev_start) but assertion checking code | |
516 // below use cur_committed.end() so make it correct. | |
517 MemRegion new_committed = | |
518 MemRegion(min_prev_start, cur_committed.end()); | |
519 cur_committed = new_committed; | |
520 } | |
521 #ifdef ASSERT | |
522 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
523 assert(cur_committed.start() == | |
524 (HeapWord*) align_size_up((uintptr_t) cur_committed.start(), | |
525 os::vm_page_size()), | |
526 "Starts should have proper alignment"); | |
527 #endif | |
528 | |
529 jbyte* new_start = byte_for(new_region.start()); | |
530 // Round down because this is for the start address | |
531 HeapWord* new_start_aligned = | |
532 (HeapWord*)align_size_down((uintptr_t)new_start, os::vm_page_size()); | |
533 // The guard page is always committed and should not be committed over. | |
534 // This method is used in cases where the generation is growing toward | |
535 // lower addresses but the guard region is still at the end of the | |
536 // card table. That still makes sense when looking for writes | |
537 // off the end of the card table. | |
538 if (new_start_aligned < cur_committed.start()) { | |
539 // Expand the committed region | |
540 // | |
541 // Case A | |
542 // |+ guard +| | |
543 // |+ cur committed +++++++++| | |
544 // |+ new committed +++++++++++++++++| | |
545 // | |
546 // Case B | |
547 // |+ guard +| | |
548 // |+ cur committed +| | |
549 // |+ new committed +++++++| | |
550 // | |
551 // These are not expected because the calculation of the | |
552 // cur committed region and the new committed region | |
553 // share the same end for the covered region. | |
554 // Case C | |
555 // |+ guard +| | |
556 // |+ cur committed +| | |
557 // |+ new committed +++++++++++++++++| | |
558 // Case D | |
559 // |+ guard +| | |
560 // |+ cur committed +++++++++++| | |
561 // |+ new committed +++++++| | |
562 | |
563 HeapWord* new_end_for_commit = | |
564 MIN2(cur_committed.end(), _guard_region.start()); | |
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565 if(new_start_aligned < new_end_for_commit) { |
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566 MemRegion new_committed = |
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567 MemRegion(new_start_aligned, new_end_for_commit); |
0 | 568 if (!os::commit_memory((char*)new_committed.start(), |
569 new_committed.byte_size())) { | |
570 vm_exit_out_of_memory(new_committed.byte_size(), | |
571 "card table expansion"); | |
572 } | |
573 } | |
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574 result = true; |
0 | 575 } else if (new_start_aligned > cur_committed.start()) { |
576 // Shrink the committed region | |
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577 #if 0 // uncommitting space is currently unsafe because of the interactions |
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578 // of growing and shrinking regions. One region A can uncommit space |
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579 // that it owns but which is being used by another region B (maybe). |
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580 // Region B has not committed the space because it was already |
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581 // committed by region A. |
0 | 582 MemRegion uncommit_region = committed_unique_to_self(changed_region, |
583 MemRegion(cur_committed.start(), new_start_aligned)); | |
584 if (!uncommit_region.is_empty()) { | |
585 if (!os::uncommit_memory((char*)uncommit_region.start(), | |
586 uncommit_region.byte_size())) { | |
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587 // If the uncommit fails, ignore it. Let the |
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588 // committed table resizing go even though the committed |
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589 // table will over state the committed space. |
0 | 590 } |
591 } | |
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592 #else |
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593 assert(!result, "Should be false with current workaround"); |
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594 #endif |
0 | 595 } |
596 assert(_committed[changed_region].end() == cur_committed.end(), | |
597 "end should not change"); | |
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598 return result; |
0 | 599 } |
600 | |
601 void CardTableExtension::resize_update_committed_table(int changed_region, | |
602 MemRegion new_region) { | |
603 | |
604 jbyte* new_start = byte_for(new_region.start()); | |
605 // Set the new start of the committed region | |
606 HeapWord* new_start_aligned = | |
607 (HeapWord*)align_size_down((uintptr_t)new_start, | |
608 os::vm_page_size()); | |
609 MemRegion new_committed = MemRegion(new_start_aligned, | |
610 _committed[changed_region].end()); | |
611 _committed[changed_region] = new_committed; | |
612 _committed[changed_region].set_start(new_start_aligned); | |
613 } | |
614 | |
615 void CardTableExtension::resize_update_card_table_entries(int changed_region, | |
616 MemRegion new_region) { | |
617 debug_only(verify_guard();) | |
618 MemRegion original_covered = _covered[changed_region]; | |
619 // Initialize the card entries. Only consider the | |
620 // region covered by the card table (_whole_heap) | |
621 jbyte* entry; | |
622 if (new_region.start() < _whole_heap.start()) { | |
623 entry = byte_for(_whole_heap.start()); | |
624 } else { | |
625 entry = byte_for(new_region.start()); | |
626 } | |
627 jbyte* end = byte_for(original_covered.start()); | |
628 // If _whole_heap starts at the original covered regions start, | |
629 // this loop will not execute. | |
630 while (entry < end) { *entry++ = clean_card; } | |
631 } | |
632 | |
633 void CardTableExtension::resize_update_covered_table(int changed_region, | |
634 MemRegion new_region) { | |
635 // Update the covered region | |
636 _covered[changed_region].set_start(new_region.start()); | |
637 _covered[changed_region].set_word_size(new_region.word_size()); | |
638 | |
639 // reorder regions. There should only be at most 1 out | |
640 // of order. | |
641 for (int i = _cur_covered_regions-1 ; i > 0; i--) { | |
642 if (_covered[i].start() < _covered[i-1].start()) { | |
643 MemRegion covered_mr = _covered[i-1]; | |
644 _covered[i-1] = _covered[i]; | |
645 _covered[i] = covered_mr; | |
646 MemRegion committed_mr = _committed[i-1]; | |
647 _committed[i-1] = _committed[i]; | |
648 _committed[i] = committed_mr; | |
649 break; | |
650 } | |
651 } | |
652 #ifdef ASSERT | |
653 for (int m = 0; m < _cur_covered_regions-1; m++) { | |
654 assert(_covered[m].start() <= _covered[m+1].start(), | |
655 "Covered regions out of order"); | |
656 assert(_committed[m].start() <= _committed[m+1].start(), | |
657 "Committed regions out of order"); | |
658 } | |
659 #endif | |
660 } | |
661 | |
662 // Returns the start of any committed region that is lower than | |
663 // the target committed region (index ind) and that intersects the | |
664 // target region. If none, return start of target region. | |
665 // | |
666 // ------------- | |
667 // | | | |
668 // ------------- | |
669 // ------------ | |
670 // | target | | |
671 // ------------ | |
672 // ------------- | |
673 // | | | |
674 // ------------- | |
675 // ^ returns this | |
676 // | |
677 // ------------- | |
678 // | | | |
679 // ------------- | |
680 // ------------ | |
681 // | target | | |
682 // ------------ | |
683 // ------------- | |
684 // | | | |
685 // ------------- | |
686 // ^ returns this | |
687 | |
688 HeapWord* CardTableExtension::lowest_prev_committed_start(int ind) const { | |
689 assert(_cur_covered_regions >= 0, "Expecting at least on region"); | |
690 HeapWord* min_start = _committed[ind].start(); | |
691 for (int j = 0; j < ind; j++) { | |
692 HeapWord* this_start = _committed[j].start(); | |
693 if ((this_start < min_start) && | |
694 !(_committed[j].intersection(_committed[ind])).is_empty()) { | |
695 min_start = this_start; | |
696 } | |
697 } | |
698 return min_start; | |
699 } |