Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/promotionInfo.cpp @ 6027:8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
Summary: Removed the HeapRegion::_top_at_conc_mark_count field. It is no longer needed as a result of the changes for 6888336 and 7127706. Refactored the closures that finalize and verify the liveness counting data so that common functionality was placed into a base class.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Wed, 25 Apr 2012 10:23:12 -0700 |
parents | f95d63e2154a |
children | f69a5d43dc19 |
rev | line source |
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1521 | 1 /* |
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2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
1521 | 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. |
1521 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" | |
27 #include "gc_implementation/concurrentMarkSweep/promotionInfo.hpp" | |
28 #include "oops/markOop.inline.hpp" | |
29 #include "oops/oop.inline.hpp" | |
1521 | 30 |
31 ///////////////////////////////////////////////////////////////////////// | |
32 //// PromotionInfo | |
33 ///////////////////////////////////////////////////////////////////////// | |
34 | |
35 | |
36 ////////////////////////////////////////////////////////////////////////////// | |
37 // We go over the list of promoted objects, removing each from the list, | |
38 // and applying the closure (this may, in turn, add more elements to | |
39 // the tail of the promoted list, and these newly added objects will | |
40 // also be processed) until the list is empty. | |
41 // To aid verification and debugging, in the non-product builds | |
42 // we actually forward _promoHead each time we process a promoted oop. | |
43 // Note that this is not necessary in general (i.e. when we don't need to | |
44 // call PromotionInfo::verify()) because oop_iterate can only add to the | |
45 // end of _promoTail, and never needs to look at _promoHead. | |
46 | |
47 #define PROMOTED_OOPS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
48 \ | |
49 void PromotionInfo::promoted_oops_iterate##nv_suffix(OopClosureType* cl) { \ | |
50 NOT_PRODUCT(verify()); \ | |
51 PromotedObject *curObj, *nextObj; \ | |
52 for (curObj = _promoHead; curObj != NULL; curObj = nextObj) { \ | |
53 if ((nextObj = curObj->next()) == NULL) { \ | |
54 /* protect ourselves against additions due to closure application \ | |
55 below by resetting the list. */ \ | |
56 assert(_promoTail == curObj, "Should have been the tail"); \ | |
57 _promoHead = _promoTail = NULL; \ | |
58 } \ | |
59 if (curObj->hasDisplacedMark()) { \ | |
60 /* restore displaced header */ \ | |
61 oop(curObj)->set_mark(nextDisplacedHeader()); \ | |
62 } else { \ | |
63 /* restore prototypical header */ \ | |
64 oop(curObj)->init_mark(); \ | |
65 } \ | |
66 /* The "promoted_mark" should now not be set */ \ | |
67 assert(!curObj->hasPromotedMark(), \ | |
68 "Should have been cleared by restoring displaced mark-word"); \ | |
69 NOT_PRODUCT(_promoHead = nextObj); \ | |
70 if (cl != NULL) oop(curObj)->oop_iterate(cl); \ | |
71 if (nextObj == NULL) { /* start at head of list reset above */ \ | |
72 nextObj = _promoHead; \ | |
73 } \ | |
74 } \ | |
75 assert(noPromotions(), "post-condition violation"); \ | |
76 assert(_promoHead == NULL && _promoTail == NULL, "emptied promoted list");\ | |
77 assert(_spoolHead == _spoolTail, "emptied spooling buffers"); \ | |
78 assert(_firstIndex == _nextIndex, "empty buffer"); \ | |
79 } | |
80 | |
81 // This should have been ALL_SINCE_...() just like the others, | |
82 // but, because the body of the method above is somehwat longer, | |
83 // the MSVC compiler cannot cope; as a workaround, we split the | |
84 // macro into its 3 constituent parts below (see original macro | |
85 // definition in specializedOopClosures.hpp). | |
86 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES_YOUNG(PROMOTED_OOPS_ITERATE_DEFN) | |
87 PROMOTED_OOPS_ITERATE_DEFN(OopsInGenClosure,_v) | |
88 | |
89 | |
90 // Return the next displaced header, incrementing the pointer and | |
91 // recycling spool area as necessary. | |
92 markOop PromotionInfo::nextDisplacedHeader() { | |
93 assert(_spoolHead != NULL, "promotionInfo inconsistency"); | |
94 assert(_spoolHead != _spoolTail || _firstIndex < _nextIndex, | |
95 "Empty spool space: no displaced header can be fetched"); | |
96 assert(_spoolHead->bufferSize > _firstIndex, "Off by one error at head?"); | |
97 markOop hdr = _spoolHead->displacedHdr[_firstIndex]; | |
98 // Spool forward | |
99 if (++_firstIndex == _spoolHead->bufferSize) { // last location in this block | |
100 // forward to next block, recycling this block into spare spool buffer | |
101 SpoolBlock* tmp = _spoolHead->nextSpoolBlock; | |
102 assert(_spoolHead != _spoolTail, "Spooling storage mix-up"); | |
103 _spoolHead->nextSpoolBlock = _spareSpool; | |
104 _spareSpool = _spoolHead; | |
105 _spoolHead = tmp; | |
106 _firstIndex = 1; | |
107 NOT_PRODUCT( | |
108 if (_spoolHead == NULL) { // all buffers fully consumed | |
109 assert(_spoolTail == NULL && _nextIndex == 1, | |
110 "spool buffers processing inconsistency"); | |
111 } | |
112 ) | |
113 } | |
114 return hdr; | |
115 } | |
116 | |
117 void PromotionInfo::track(PromotedObject* trackOop) { | |
118 track(trackOop, oop(trackOop)->klass()); | |
119 } | |
120 | |
121 void PromotionInfo::track(PromotedObject* trackOop, klassOop klassOfOop) { | |
122 // make a copy of header as it may need to be spooled | |
123 markOop mark = oop(trackOop)->mark(); | |
124 trackOop->clearNext(); | |
125 if (mark->must_be_preserved_for_cms_scavenge(klassOfOop)) { | |
126 // save non-prototypical header, and mark oop | |
127 saveDisplacedHeader(mark); | |
128 trackOop->setDisplacedMark(); | |
129 } else { | |
130 // we'd like to assert something like the following: | |
131 // assert(mark == markOopDesc::prototype(), "consistency check"); | |
132 // ... but the above won't work because the age bits have not (yet) been | |
133 // cleared. The remainder of the check would be identical to the | |
134 // condition checked in must_be_preserved() above, so we don't really | |
135 // have anything useful to check here! | |
136 } | |
137 if (_promoTail != NULL) { | |
138 assert(_promoHead != NULL, "List consistency"); | |
139 _promoTail->setNext(trackOop); | |
140 _promoTail = trackOop; | |
141 } else { | |
142 assert(_promoHead == NULL, "List consistency"); | |
143 _promoHead = _promoTail = trackOop; | |
144 } | |
145 // Mask as newly promoted, so we can skip over such objects | |
146 // when scanning dirty cards | |
147 assert(!trackOop->hasPromotedMark(), "Should not have been marked"); | |
148 trackOop->setPromotedMark(); | |
149 } | |
150 | |
151 // Save the given displaced header, incrementing the pointer and | |
152 // obtaining more spool area as necessary. | |
153 void PromotionInfo::saveDisplacedHeader(markOop hdr) { | |
154 assert(_spoolHead != NULL && _spoolTail != NULL, | |
155 "promotionInfo inconsistency"); | |
156 assert(_spoolTail->bufferSize > _nextIndex, "Off by one error at tail?"); | |
157 _spoolTail->displacedHdr[_nextIndex] = hdr; | |
158 // Spool forward | |
159 if (++_nextIndex == _spoolTail->bufferSize) { // last location in this block | |
160 // get a new spooling block | |
161 assert(_spoolTail->nextSpoolBlock == NULL, "tail should terminate spool list"); | |
162 _splice_point = _spoolTail; // save for splicing | |
163 _spoolTail->nextSpoolBlock = getSpoolBlock(); // might fail | |
164 _spoolTail = _spoolTail->nextSpoolBlock; // might become NULL ... | |
165 // ... but will attempt filling before next promotion attempt | |
166 _nextIndex = 1; | |
167 } | |
168 } | |
169 | |
170 // Ensure that spooling space exists. Return false if spooling space | |
171 // could not be obtained. | |
172 bool PromotionInfo::ensure_spooling_space_work() { | |
173 assert(!has_spooling_space(), "Only call when there is no spooling space"); | |
174 // Try and obtain more spooling space | |
175 SpoolBlock* newSpool = getSpoolBlock(); | |
176 assert(newSpool == NULL || | |
177 (newSpool->bufferSize != 0 && newSpool->nextSpoolBlock == NULL), | |
178 "getSpoolBlock() sanity check"); | |
179 if (newSpool == NULL) { | |
180 return false; | |
181 } | |
182 _nextIndex = 1; | |
183 if (_spoolTail == NULL) { | |
184 _spoolTail = newSpool; | |
185 if (_spoolHead == NULL) { | |
186 _spoolHead = newSpool; | |
187 _firstIndex = 1; | |
188 } else { | |
189 assert(_splice_point != NULL && _splice_point->nextSpoolBlock == NULL, | |
190 "Splice point invariant"); | |
191 // Extra check that _splice_point is connected to list | |
192 #ifdef ASSERT | |
193 { | |
194 SpoolBlock* blk = _spoolHead; | |
195 for (; blk->nextSpoolBlock != NULL; | |
196 blk = blk->nextSpoolBlock); | |
197 assert(blk != NULL && blk == _splice_point, | |
198 "Splice point incorrect"); | |
199 } | |
200 #endif // ASSERT | |
201 _splice_point->nextSpoolBlock = newSpool; | |
202 } | |
203 } else { | |
204 assert(_spoolHead != NULL, "spool list consistency"); | |
205 _spoolTail->nextSpoolBlock = newSpool; | |
206 _spoolTail = newSpool; | |
207 } | |
208 return true; | |
209 } | |
210 | |
211 // Get a free spool buffer from the free pool, getting a new block | |
212 // from the heap if necessary. | |
213 SpoolBlock* PromotionInfo::getSpoolBlock() { | |
214 SpoolBlock* res; | |
215 if ((res = _spareSpool) != NULL) { | |
216 _spareSpool = _spareSpool->nextSpoolBlock; | |
217 res->nextSpoolBlock = NULL; | |
218 } else { // spare spool exhausted, get some from heap | |
219 res = (SpoolBlock*)(space()->allocateScratch(refillSize())); | |
220 if (res != NULL) { | |
221 res->init(); | |
222 } | |
223 } | |
224 assert(res == NULL || res->nextSpoolBlock == NULL, "postcondition"); | |
225 return res; | |
226 } | |
227 | |
228 void PromotionInfo::startTrackingPromotions() { | |
229 assert(_spoolHead == _spoolTail && _firstIndex == _nextIndex, | |
230 "spooling inconsistency?"); | |
231 _firstIndex = _nextIndex = 1; | |
232 _tracking = true; | |
233 } | |
234 | |
235 #define CMSPrintPromoBlockInfo 1 | |
236 | |
237 void PromotionInfo::stopTrackingPromotions(uint worker_id) { | |
238 assert(_spoolHead == _spoolTail && _firstIndex == _nextIndex, | |
239 "spooling inconsistency?"); | |
240 _firstIndex = _nextIndex = 1; | |
241 _tracking = false; | |
242 if (CMSPrintPromoBlockInfo > 1) { | |
243 print_statistics(worker_id); | |
244 } | |
245 } | |
246 | |
247 void PromotionInfo::print_statistics(uint worker_id) const { | |
248 assert(_spoolHead == _spoolTail && _firstIndex == _nextIndex, | |
249 "Else will undercount"); | |
250 assert(CMSPrintPromoBlockInfo > 0, "Else unnecessary call"); | |
251 // Count the number of blocks and slots in the free pool | |
252 size_t slots = 0; | |
253 size_t blocks = 0; | |
254 for (SpoolBlock* cur_spool = _spareSpool; | |
255 cur_spool != NULL; | |
256 cur_spool = cur_spool->nextSpoolBlock) { | |
257 // the first entry is just a self-pointer; indices 1 through | |
258 // bufferSize - 1 are occupied (thus, bufferSize - 1 slots). | |
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259 assert((void*)cur_spool->displacedHdr == (void*)&cur_spool->displacedHdr, |
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260 "first entry of displacedHdr should be self-referential"); |
1521 | 261 slots += cur_spool->bufferSize - 1; |
262 blocks++; | |
263 } | |
264 if (_spoolHead != NULL) { | |
265 slots += _spoolHead->bufferSize - 1; | |
266 blocks++; | |
267 } | |
268 gclog_or_tty->print_cr(" [worker %d] promo_blocks = %d, promo_slots = %d ", | |
269 worker_id, blocks, slots); | |
270 } | |
271 | |
272 // When _spoolTail is not NULL, then the slot <_spoolTail, _nextIndex> | |
273 // points to the next slot available for filling. | |
274 // The set of slots holding displaced headers are then all those in the | |
275 // right-open interval denoted by: | |
276 // | |
277 // [ <_spoolHead, _firstIndex>, <_spoolTail, _nextIndex> ) | |
278 // | |
279 // When _spoolTail is NULL, then the set of slots with displaced headers | |
280 // is all those starting at the slot <_spoolHead, _firstIndex> and | |
281 // going up to the last slot of last block in the linked list. | |
282 // In this lartter case, _splice_point points to the tail block of | |
283 // this linked list of blocks holding displaced headers. | |
284 void PromotionInfo::verify() const { | |
285 // Verify the following: | |
286 // 1. the number of displaced headers matches the number of promoted | |
287 // objects that have displaced headers | |
288 // 2. each promoted object lies in this space | |
289 debug_only( | |
290 PromotedObject* junk = NULL; | |
291 assert(junk->next_addr() == (void*)(oop(junk)->mark_addr()), | |
292 "Offset of PromotedObject::_next is expected to align with " | |
293 " the OopDesc::_mark within OopDesc"); | |
294 ) | |
295 // FIXME: guarantee???? | |
296 guarantee(_spoolHead == NULL || _spoolTail != NULL || | |
297 _splice_point != NULL, "list consistency"); | |
298 guarantee(_promoHead == NULL || _promoTail != NULL, "list consistency"); | |
299 // count the number of objects with displaced headers | |
300 size_t numObjsWithDisplacedHdrs = 0; | |
301 for (PromotedObject* curObj = _promoHead; curObj != NULL; curObj = curObj->next()) { | |
302 guarantee(space()->is_in_reserved((HeapWord*)curObj), "Containment"); | |
303 // the last promoted object may fail the mark() != NULL test of is_oop(). | |
304 guarantee(curObj->next() == NULL || oop(curObj)->is_oop(), "must be an oop"); | |
305 if (curObj->hasDisplacedMark()) { | |
306 numObjsWithDisplacedHdrs++; | |
307 } | |
308 } | |
309 // Count the number of displaced headers | |
310 size_t numDisplacedHdrs = 0; | |
311 for (SpoolBlock* curSpool = _spoolHead; | |
312 curSpool != _spoolTail && curSpool != NULL; | |
313 curSpool = curSpool->nextSpoolBlock) { | |
314 // the first entry is just a self-pointer; indices 1 through | |
315 // bufferSize - 1 are occupied (thus, bufferSize - 1 slots). | |
316 guarantee((void*)curSpool->displacedHdr == (void*)&curSpool->displacedHdr, | |
317 "first entry of displacedHdr should be self-referential"); | |
318 numDisplacedHdrs += curSpool->bufferSize - 1; | |
319 } | |
320 guarantee((_spoolHead == _spoolTail) == (numDisplacedHdrs == 0), | |
321 "internal consistency"); | |
322 guarantee(_spoolTail != NULL || _nextIndex == 1, | |
323 "Inconsistency between _spoolTail and _nextIndex"); | |
324 // We overcounted (_firstIndex-1) worth of slots in block | |
325 // _spoolHead and we undercounted (_nextIndex-1) worth of | |
326 // slots in block _spoolTail. We make an appropriate | |
327 // adjustment by subtracting the first and adding the | |
328 // second: - (_firstIndex - 1) + (_nextIndex - 1) | |
329 numDisplacedHdrs += (_nextIndex - _firstIndex); | |
330 guarantee(numDisplacedHdrs == numObjsWithDisplacedHdrs, "Displaced hdr count"); | |
331 } | |
332 | |
333 void PromotionInfo::print_on(outputStream* st) const { | |
334 SpoolBlock* curSpool = NULL; | |
335 size_t i = 0; | |
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336 st->print_cr(" start & end indices: [" SIZE_FORMAT ", " SIZE_FORMAT ")", |
1521 | 337 _firstIndex, _nextIndex); |
338 for (curSpool = _spoolHead; curSpool != _spoolTail && curSpool != NULL; | |
339 curSpool = curSpool->nextSpoolBlock) { | |
340 curSpool->print_on(st); | |
341 st->print_cr(" active "); | |
342 i++; | |
343 } | |
344 for (curSpool = _spoolTail; curSpool != NULL; | |
345 curSpool = curSpool->nextSpoolBlock) { | |
346 curSpool->print_on(st); | |
347 st->print_cr(" inactive "); | |
348 i++; | |
349 } | |
350 for (curSpool = _spareSpool; curSpool != NULL; | |
351 curSpool = curSpool->nextSpoolBlock) { | |
352 curSpool->print_on(st); | |
353 st->print_cr(" free "); | |
354 i++; | |
355 } | |
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356 st->print_cr(" " SIZE_FORMAT " header spooling blocks", i); |
1521 | 357 } |
358 | |
359 void SpoolBlock::print_on(outputStream* st) const { | |
360 st->print("[" PTR_FORMAT "," PTR_FORMAT "), " SIZE_FORMAT " HeapWords -> " PTR_FORMAT, | |
361 this, (HeapWord*)displacedHdr + bufferSize, | |
362 bufferSize, nextSpoolBlock); | |
363 } |