Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/freeList.cpp @ 4709:fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
Summary: Cache workers' calculated starting heap region, used for parallel iteration over the collcection set, for subsequent reuse.
Reviewed-by: tonyp, brutisso
author | johnc |
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date | Wed, 14 Dec 2011 17:43:55 -0800 |
parents | f75137faa7fe |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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/concurrentMarkSweep/freeBlockDictionary.hpp" | |
27 #include "gc_implementation/concurrentMarkSweep/freeList.hpp" | |
28 #include "memory/sharedHeap.hpp" | |
29 #include "runtime/globals.hpp" | |
30 #include "runtime/mutex.hpp" | |
31 #include "runtime/vmThread.hpp" | |
0 | 32 |
33 // Free list. A FreeList is used to access a linked list of chunks | |
34 // of space in the heap. The head and tail are maintained so that | |
35 // items can be (as in the current implementation) added at the | |
36 // at the tail of the list and removed from the head of the list to | |
37 // maintain a FIFO queue. | |
38 | |
39 FreeList::FreeList() : | |
40 _head(NULL), _tail(NULL) | |
41 #ifdef ASSERT | |
42 , _protecting_lock(NULL) | |
43 #endif | |
44 { | |
45 _size = 0; | |
46 _count = 0; | |
47 _hint = 0; | |
48 init_statistics(); | |
49 } | |
50 | |
51 FreeList::FreeList(FreeChunk* fc) : | |
52 _head(fc), _tail(fc) | |
53 #ifdef ASSERT | |
54 , _protecting_lock(NULL) | |
55 #endif | |
56 { | |
57 _size = fc->size(); | |
58 _count = 1; | |
59 _hint = 0; | |
60 init_statistics(); | |
61 #ifndef PRODUCT | |
62 _allocation_stats.set_returnedBytes(size() * HeapWordSize); | |
63 #endif | |
64 } | |
65 | |
66 FreeList::FreeList(HeapWord* addr, size_t size) : | |
67 _head((FreeChunk*) addr), _tail((FreeChunk*) addr) | |
68 #ifdef ASSERT | |
69 , _protecting_lock(NULL) | |
70 #endif | |
71 { | |
72 assert(size > sizeof(FreeChunk), "size is too small"); | |
73 head()->setSize(size); | |
74 _size = size; | |
75 _count = 1; | |
76 init_statistics(); | |
77 #ifndef PRODUCT | |
78 _allocation_stats.set_returnedBytes(_size * HeapWordSize); | |
79 #endif | |
80 } | |
81 | |
82 void FreeList::reset(size_t hint) { | |
83 set_count(0); | |
84 set_head(NULL); | |
85 set_tail(NULL); | |
86 set_hint(hint); | |
87 } | |
88 | |
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89 void FreeList::init_statistics(bool split_birth) { |
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90 _allocation_stats.initialize(split_birth); |
0 | 91 } |
92 | |
93 FreeChunk* FreeList::getChunkAtHead() { | |
94 assert_proper_lock_protection(); | |
95 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
96 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
97 FreeChunk* fc = head(); | |
98 if (fc != NULL) { | |
99 FreeChunk* nextFC = fc->next(); | |
100 if (nextFC != NULL) { | |
101 // The chunk fc being removed has a "next". Set the "next" to the | |
102 // "prev" of fc. | |
103 nextFC->linkPrev(NULL); | |
104 } else { // removed tail of list | |
105 link_tail(NULL); | |
106 } | |
107 link_head(nextFC); | |
108 decrement_count(); | |
109 } | |
110 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
111 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
112 return fc; | |
113 } | |
114 | |
115 | |
116 void FreeList::getFirstNChunksFromList(size_t n, FreeList* fl) { | |
117 assert_proper_lock_protection(); | |
118 assert(fl->count() == 0, "Precondition"); | |
119 if (count() > 0) { | |
120 int k = 1; | |
121 fl->set_head(head()); n--; | |
122 FreeChunk* tl = head(); | |
123 while (tl->next() != NULL && n > 0) { | |
124 tl = tl->next(); n--; k++; | |
125 } | |
126 assert(tl != NULL, "Loop Inv."); | |
127 | |
128 // First, fix up the list we took from. | |
129 FreeChunk* new_head = tl->next(); | |
130 set_head(new_head); | |
131 set_count(count() - k); | |
132 if (new_head == NULL) { | |
133 set_tail(NULL); | |
134 } else { | |
135 new_head->linkPrev(NULL); | |
136 } | |
137 // Now we can fix up the tail. | |
138 tl->linkNext(NULL); | |
139 // And return the result. | |
140 fl->set_tail(tl); | |
141 fl->set_count(k); | |
142 } | |
143 } | |
144 | |
145 // Remove this chunk from the list | |
146 void FreeList::removeChunk(FreeChunk*fc) { | |
147 assert_proper_lock_protection(); | |
148 assert(head() != NULL, "Remove from empty list"); | |
149 assert(fc != NULL, "Remove a NULL chunk"); | |
150 assert(size() == fc->size(), "Wrong list"); | |
151 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
152 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
153 | |
154 FreeChunk* prevFC = fc->prev(); | |
155 FreeChunk* nextFC = fc->next(); | |
156 if (nextFC != NULL) { | |
157 // The chunk fc being removed has a "next". Set the "next" to the | |
158 // "prev" of fc. | |
159 nextFC->linkPrev(prevFC); | |
160 } else { // removed tail of list | |
161 link_tail(prevFC); | |
162 } | |
163 if (prevFC == NULL) { // removed head of list | |
164 link_head(nextFC); | |
165 assert(nextFC == NULL || nextFC->prev() == NULL, | |
166 "Prev of head should be NULL"); | |
167 } else { | |
168 prevFC->linkNext(nextFC); | |
169 assert(tail() != prevFC || prevFC->next() == NULL, | |
170 "Next of tail should be NULL"); | |
171 } | |
172 decrement_count(); | |
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173 assert(((head() == NULL) + (tail() == NULL) + (count() == 0)) % 3 == 0, |
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174 "H/T/C Inconsistency"); |
0 | 175 // clear next and prev fields of fc, debug only |
176 NOT_PRODUCT( | |
177 fc->linkPrev(NULL); | |
178 fc->linkNext(NULL); | |
179 ) | |
180 assert(fc->isFree(), "Should still be a free chunk"); | |
181 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
182 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
183 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
184 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
185 } | |
186 | |
187 // Add this chunk at the head of the list. | |
188 void FreeList::returnChunkAtHead(FreeChunk* chunk, bool record_return) { | |
189 assert_proper_lock_protection(); | |
190 assert(chunk != NULL, "insert a NULL chunk"); | |
191 assert(size() == chunk->size(), "Wrong size"); | |
192 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
193 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
194 | |
195 FreeChunk* oldHead = head(); | |
196 assert(chunk != oldHead, "double insertion"); | |
197 chunk->linkAfter(oldHead); | |
198 link_head(chunk); | |
199 if (oldHead == NULL) { // only chunk in list | |
200 assert(tail() == NULL, "inconsistent FreeList"); | |
201 link_tail(chunk); | |
202 } | |
203 increment_count(); // of # of chunks in list | |
204 DEBUG_ONLY( | |
205 if (record_return) { | |
206 increment_returnedBytes_by(size()*HeapWordSize); | |
207 } | |
208 ) | |
209 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
210 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
211 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
212 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
213 } | |
214 | |
215 void FreeList::returnChunkAtHead(FreeChunk* chunk) { | |
216 assert_proper_lock_protection(); | |
217 returnChunkAtHead(chunk, true); | |
218 } | |
219 | |
220 // Add this chunk at the tail of the list. | |
221 void FreeList::returnChunkAtTail(FreeChunk* chunk, bool record_return) { | |
222 assert_proper_lock_protection(); | |
223 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
224 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
225 assert(chunk != NULL, "insert a NULL chunk"); | |
226 assert(size() == chunk->size(), "wrong size"); | |
227 | |
228 FreeChunk* oldTail = tail(); | |
229 assert(chunk != oldTail, "double insertion"); | |
230 if (oldTail != NULL) { | |
231 oldTail->linkAfter(chunk); | |
232 } else { // only chunk in list | |
233 assert(head() == NULL, "inconsistent FreeList"); | |
234 link_head(chunk); | |
235 } | |
236 link_tail(chunk); | |
237 increment_count(); // of # of chunks in list | |
238 DEBUG_ONLY( | |
239 if (record_return) { | |
240 increment_returnedBytes_by(size()*HeapWordSize); | |
241 } | |
242 ) | |
243 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | |
244 assert(tail() == NULL || tail()->next() == NULL, "list invariant"); | |
245 assert(head() == NULL || head()->size() == size(), "wrong item on list"); | |
246 assert(tail() == NULL || tail()->size() == size(), "wrong item on list"); | |
247 } | |
248 | |
249 void FreeList::returnChunkAtTail(FreeChunk* chunk) { | |
250 returnChunkAtTail(chunk, true); | |
251 } | |
252 | |
253 void FreeList::prepend(FreeList* fl) { | |
254 assert_proper_lock_protection(); | |
255 if (fl->count() > 0) { | |
256 if (count() == 0) { | |
257 set_head(fl->head()); | |
258 set_tail(fl->tail()); | |
259 set_count(fl->count()); | |
260 } else { | |
261 // Both are non-empty. | |
262 FreeChunk* fl_tail = fl->tail(); | |
263 FreeChunk* this_head = head(); | |
264 assert(fl_tail->next() == NULL, "Well-formedness of fl"); | |
265 fl_tail->linkNext(this_head); | |
266 this_head->linkPrev(fl_tail); | |
267 set_head(fl->head()); | |
268 set_count(count() + fl->count()); | |
269 } | |
270 fl->set_head(NULL); | |
271 fl->set_tail(NULL); | |
272 fl->set_count(0); | |
273 } | |
274 } | |
275 | |
276 // verifyChunkInFreeLists() is used to verify that an item is in this free list. | |
277 // It is used as a debugging aid. | |
278 bool FreeList::verifyChunkInFreeLists(FreeChunk* fc) const { | |
279 // This is an internal consistency check, not part of the check that the | |
280 // chunk is in the free lists. | |
281 guarantee(fc->size() == size(), "Wrong list is being searched"); | |
282 FreeChunk* curFC = head(); | |
283 while (curFC) { | |
284 // This is an internal consistency check. | |
285 guarantee(size() == curFC->size(), "Chunk is in wrong list."); | |
286 if (fc == curFC) { | |
287 return true; | |
288 } | |
289 curFC = curFC->next(); | |
290 } | |
291 return false; | |
292 } | |
293 | |
294 #ifndef PRODUCT | |
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295 void FreeList::verify_stats() const { |
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296 // The +1 of the LH comparand is to allow some "looseness" in |
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297 // checking: we usually call this interface when adding a block |
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298 // and we'll subsequently update the stats; we cannot update the |
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299 // stats beforehand because in the case of the large-block BT |
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300 // dictionary for example, this might be the first block and |
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301 // in that case there would be no place that we could record |
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302 // the stats (which are kept in the block itself). |
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303 assert((_allocation_stats.prevSweep() + _allocation_stats.splitBirths() |
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304 + _allocation_stats.coalBirths() + 1) // Total Production Stock + 1 |
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305 >= (_allocation_stats.splitDeaths() + _allocation_stats.coalDeaths() |
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306 + (ssize_t)count()), // Total Current Stock + depletion |
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307 err_msg("FreeList " PTR_FORMAT " of size " SIZE_FORMAT |
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308 " violates Conservation Principle: " |
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309 "prevSweep(" SIZE_FORMAT ")" |
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310 " + splitBirths(" SIZE_FORMAT ")" |
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311 " + coalBirths(" SIZE_FORMAT ") + 1 >= " |
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312 " splitDeaths(" SIZE_FORMAT ")" |
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313 " coalDeaths(" SIZE_FORMAT ")" |
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314 " + count(" SSIZE_FORMAT ")", |
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315 this, _size, _allocation_stats.prevSweep(), _allocation_stats.splitBirths(), |
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316 _allocation_stats.splitBirths(), _allocation_stats.splitDeaths(), |
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317 _allocation_stats.coalDeaths(), count())); |
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318 } |
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319 |
0 | 320 void FreeList::assert_proper_lock_protection_work() const { |
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321 assert(_protecting_lock != NULL, "Don't call this directly"); |
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322 assert(ParallelGCThreads > 0, "Don't call this directly"); |
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323 Thread* thr = Thread::current(); |
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324 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
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325 // assert that we are holding the freelist lock |
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326 } else if (thr->is_GC_task_thread()) { |
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327 assert(_protecting_lock->owned_by_self(), "FreeList RACE DETECTED"); |
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328 } else if (thr->is_Java_thread()) { |
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329 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); |
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330 } else { |
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331 ShouldNotReachHere(); // unaccounted thread type? |
0 | 332 } |
333 } | |
334 #endif | |
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335 |
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336 // Print the "label line" for free list stats. |
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337 void FreeList::print_labels_on(outputStream* st, const char* c) { |
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338 st->print("%16s\t", c); |
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339 st->print("%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" |
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340 "%14s\t" "%14s\t" "%14s\t" "%14s\t" "%14s\t" "\n", |
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341 "bfrsurp", "surplus", "desired", "prvSwep", "bfrSwep", |
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342 "count", "cBirths", "cDeaths", "sBirths", "sDeaths"); |
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343 } |
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344 |
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345 // Print the AllocationStats for the given free list. If the second argument |
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346 // to the call is a non-null string, it is printed in the first column; |
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347 // otherwise, if the argument is null (the default), then the size of the |
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348 // (free list) block is printed in the first column. |
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349 void FreeList::print_on(outputStream* st, const char* c) const { |
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350 if (c != NULL) { |
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351 st->print("%16s", c); |
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352 } else { |
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353 st->print(SIZE_FORMAT_W(16), size()); |
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354 } |
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355 st->print("\t" |
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356 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" |
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357 SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\n", |
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358 bfrSurp(), surplus(), desired(), prevSweep(), beforeSweep(), |
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359 count(), coalBirths(), coalDeaths(), splitBirths(), splitDeaths()); |
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360 } |