Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1BlockOffsetTable.cpp @ 8500:992f62c457b0
-More bug fixes
author | Christos Kotselidis <christos.kotselidis@oracle.com> |
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date | Tue, 05 Mar 2013 18:53:26 +0100 |
parents | 2fc0334f613a |
children | 746b070f5022 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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/g1BlockOffsetTable.inline.hpp" | |
27 #include "memory/space.hpp" | |
28 #include "oops/oop.inline.hpp" | |
29 #include "runtime/java.hpp" | |
6197 | 30 #include "services/memTracker.hpp" |
342 | 31 |
32 ////////////////////////////////////////////////////////////////////// | |
33 // G1BlockOffsetSharedArray | |
34 ////////////////////////////////////////////////////////////////////// | |
35 | |
36 G1BlockOffsetSharedArray::G1BlockOffsetSharedArray(MemRegion reserved, | |
37 size_t init_word_size) : | |
38 _reserved(reserved), _end(NULL) | |
39 { | |
40 size_t size = compute_size(reserved.word_size()); | |
41 ReservedSpace rs(ReservedSpace::allocation_align_size_up(size)); | |
42 if (!rs.is_reserved()) { | |
43 vm_exit_during_initialization("Could not reserve enough space for heap offset array"); | |
44 } | |
45 if (!_vs.initialize(rs, 0)) { | |
46 vm_exit_during_initialization("Could not reserve enough space for heap offset array"); | |
47 } | |
6197 | 48 |
49 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
50 | |
342 | 51 _offset_array = (u_char*)_vs.low_boundary(); |
52 resize(init_word_size); | |
53 if (TraceBlockOffsetTable) { | |
54 gclog_or_tty->print_cr("G1BlockOffsetSharedArray::G1BlockOffsetSharedArray: "); | |
55 gclog_or_tty->print_cr(" " | |
56 " rs.base(): " INTPTR_FORMAT | |
57 " rs.size(): " INTPTR_FORMAT | |
58 " rs end(): " INTPTR_FORMAT, | |
59 rs.base(), rs.size(), rs.base() + rs.size()); | |
60 gclog_or_tty->print_cr(" " | |
61 " _vs.low_boundary(): " INTPTR_FORMAT | |
62 " _vs.high_boundary(): " INTPTR_FORMAT, | |
63 _vs.low_boundary(), | |
64 _vs.high_boundary()); | |
65 } | |
66 } | |
67 | |
68 void G1BlockOffsetSharedArray::resize(size_t new_word_size) { | |
69 assert(new_word_size <= _reserved.word_size(), "Resize larger than reserved"); | |
70 size_t new_size = compute_size(new_word_size); | |
71 size_t old_size = _vs.committed_size(); | |
72 size_t delta; | |
73 char* high = _vs.high(); | |
74 _end = _reserved.start() + new_word_size; | |
75 if (new_size > old_size) { | |
76 delta = ReservedSpace::page_align_size_up(new_size - old_size); | |
77 assert(delta > 0, "just checking"); | |
78 if (!_vs.expand_by(delta)) { | |
79 // Do better than this for Merlin | |
80 vm_exit_out_of_memory(delta, "offset table expansion"); | |
81 } | |
82 assert(_vs.high() == high + delta, "invalid expansion"); | |
83 // Initialization of the contents is left to the | |
84 // G1BlockOffsetArray that uses it. | |
85 } else { | |
86 delta = ReservedSpace::page_align_size_down(old_size - new_size); | |
87 if (delta == 0) return; | |
88 _vs.shrink_by(delta); | |
89 assert(_vs.high() == high - delta, "invalid expansion"); | |
90 } | |
91 } | |
92 | |
93 bool G1BlockOffsetSharedArray::is_card_boundary(HeapWord* p) const { | |
94 assert(p >= _reserved.start(), "just checking"); | |
95 size_t delta = pointer_delta(p, _reserved.start()); | |
96 return (delta & right_n_bits(LogN_words)) == (size_t)NoBits; | |
97 } | |
98 | |
99 | |
100 ////////////////////////////////////////////////////////////////////// | |
101 // G1BlockOffsetArray | |
102 ////////////////////////////////////////////////////////////////////// | |
103 | |
104 G1BlockOffsetArray::G1BlockOffsetArray(G1BlockOffsetSharedArray* array, | |
105 MemRegion mr, bool init_to_zero) : | |
106 G1BlockOffsetTable(mr.start(), mr.end()), | |
107 _unallocated_block(_bottom), | |
108 _array(array), _csp(NULL), | |
109 _init_to_zero(init_to_zero) { | |
110 assert(_bottom <= _end, "arguments out of order"); | |
111 if (!_init_to_zero) { | |
112 // initialize cards to point back to mr.start() | |
113 set_remainder_to_point_to_start(mr.start() + N_words, mr.end()); | |
114 _array->set_offset_array(0, 0); // set first card to 0 | |
115 } | |
116 } | |
117 | |
118 void G1BlockOffsetArray::set_space(Space* sp) { | |
119 _sp = sp; | |
120 _csp = sp->toContiguousSpace(); | |
121 } | |
122 | |
123 // The arguments follow the normal convention of denoting | |
124 // a right-open interval: [start, end) | |
125 void | |
126 G1BlockOffsetArray:: set_remainder_to_point_to_start(HeapWord* start, HeapWord* end) { | |
127 | |
128 if (start >= end) { | |
129 // The start address is equal to the end address (or to | |
130 // the right of the end address) so there are not cards | |
131 // that need to be updated.. | |
132 return; | |
133 } | |
134 | |
135 // Write the backskip value for each region. | |
136 // | |
137 // offset | |
138 // card 2nd 3rd | |
139 // | +- 1st | | | |
140 // v v v v | |
141 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+- | |
142 // |x|0|0|0|0|0|0|0|1|1|1|1|1|1| ... |1|1|1|1|2|2|2|2|2|2| ... | |
143 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+- | |
144 // 11 19 75 | |
145 // 12 | |
146 // | |
147 // offset card is the card that points to the start of an object | |
148 // x - offset value of offset card | |
149 // 1st - start of first logarithmic region | |
150 // 0 corresponds to logarithmic value N_words + 0 and 2**(3 * 0) = 1 | |
151 // 2nd - start of second logarithmic region | |
152 // 1 corresponds to logarithmic value N_words + 1 and 2**(3 * 1) = 8 | |
153 // 3rd - start of third logarithmic region | |
154 // 2 corresponds to logarithmic value N_words + 2 and 2**(3 * 2) = 64 | |
155 // | |
156 // integer below the block offset entry is an example of | |
157 // the index of the entry | |
158 // | |
159 // Given an address, | |
160 // Find the index for the address | |
161 // Find the block offset table entry | |
162 // Convert the entry to a back slide | |
163 // (e.g., with today's, offset = 0x81 => | |
164 // back slip = 2**(3*(0x81 - N_words)) = 2**3) = 8 | |
165 // Move back N (e.g., 8) entries and repeat with the | |
166 // value of the new entry | |
167 // | |
168 size_t start_card = _array->index_for(start); | |
169 size_t end_card = _array->index_for(end-1); | |
170 assert(start ==_array->address_for_index(start_card), "Precondition"); | |
171 assert(end ==_array->address_for_index(end_card)+N_words, "Precondition"); | |
172 set_remainder_to_point_to_start_incl(start_card, end_card); // closed interval | |
173 } | |
174 | |
175 // Unlike the normal convention in this code, the argument here denotes | |
176 // a closed, inclusive interval: [start_card, end_card], cf set_remainder_to_point_to_start() | |
177 // above. | |
178 void | |
179 G1BlockOffsetArray::set_remainder_to_point_to_start_incl(size_t start_card, size_t end_card) { | |
180 if (start_card > end_card) { | |
181 return; | |
182 } | |
183 assert(start_card > _array->index_for(_bottom), "Cannot be first card"); | |
184 assert(_array->offset_array(start_card-1) <= N_words, | |
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185 "Offset card has an unexpected value"); |
342 | 186 size_t start_card_for_region = start_card; |
187 u_char offset = max_jubyte; | |
188 for (int i = 0; i < BlockOffsetArray::N_powers; i++) { | |
189 // -1 so that the the card with the actual offset is counted. Another -1 | |
190 // so that the reach ends in this region and not at the start | |
191 // of the next. | |
192 size_t reach = start_card - 1 + (BlockOffsetArray::power_to_cards_back(i+1) - 1); | |
193 offset = N_words + i; | |
194 if (reach >= end_card) { | |
195 _array->set_offset_array(start_card_for_region, end_card, offset); | |
196 start_card_for_region = reach + 1; | |
197 break; | |
198 } | |
199 _array->set_offset_array(start_card_for_region, reach, offset); | |
200 start_card_for_region = reach + 1; | |
201 } | |
202 assert(start_card_for_region > end_card, "Sanity check"); | |
203 DEBUG_ONLY(check_all_cards(start_card, end_card);) | |
204 } | |
205 | |
206 // The block [blk_start, blk_end) has been allocated; | |
207 // adjust the block offset table to represent this information; | |
208 // right-open interval: [blk_start, blk_end) | |
209 void | |
210 G1BlockOffsetArray::alloc_block(HeapWord* blk_start, HeapWord* blk_end) { | |
211 mark_block(blk_start, blk_end); | |
212 allocated(blk_start, blk_end); | |
213 } | |
214 | |
215 // Adjust BOT to show that a previously whole block has been split | |
216 // into two. | |
217 void G1BlockOffsetArray::split_block(HeapWord* blk, size_t blk_size, | |
218 size_t left_blk_size) { | |
219 // Verify that the BOT shows [blk, blk + blk_size) to be one block. | |
220 verify_single_block(blk, blk_size); | |
221 // Update the BOT to indicate that [blk + left_blk_size, blk + blk_size) | |
222 // is one single block. | |
223 mark_block(blk + left_blk_size, blk + blk_size); | |
224 } | |
225 | |
226 | |
227 // Action_mark - update the BOT for the block [blk_start, blk_end). | |
228 // Current typical use is for splitting a block. | |
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229 // Action_single - update the BOT for an allocation. |
342 | 230 // Action_verify - BOT verification. |
231 void G1BlockOffsetArray::do_block_internal(HeapWord* blk_start, | |
232 HeapWord* blk_end, | |
233 Action action) { | |
234 assert(Universe::heap()->is_in_reserved(blk_start), | |
235 "reference must be into the heap"); | |
236 assert(Universe::heap()->is_in_reserved(blk_end-1), | |
237 "limit must be within the heap"); | |
238 // This is optimized to make the test fast, assuming we only rarely | |
239 // cross boundaries. | |
240 uintptr_t end_ui = (uintptr_t)(blk_end - 1); | |
241 uintptr_t start_ui = (uintptr_t)blk_start; | |
242 // Calculate the last card boundary preceding end of blk | |
243 intptr_t boundary_before_end = (intptr_t)end_ui; | |
244 clear_bits(boundary_before_end, right_n_bits(LogN)); | |
245 if (start_ui <= (uintptr_t)boundary_before_end) { | |
246 // blk starts at or crosses a boundary | |
247 // Calculate index of card on which blk begins | |
248 size_t start_index = _array->index_for(blk_start); | |
249 // Index of card on which blk ends | |
250 size_t end_index = _array->index_for(blk_end - 1); | |
251 // Start address of card on which blk begins | |
252 HeapWord* boundary = _array->address_for_index(start_index); | |
253 assert(boundary <= blk_start, "blk should start at or after boundary"); | |
254 if (blk_start != boundary) { | |
255 // blk starts strictly after boundary | |
256 // adjust card boundary and start_index forward to next card | |
257 boundary += N_words; | |
258 start_index++; | |
259 } | |
260 assert(start_index <= end_index, "monotonicity of index_for()"); | |
261 assert(boundary <= (HeapWord*)boundary_before_end, "tautology"); | |
262 switch (action) { | |
263 case Action_mark: { | |
264 if (init_to_zero()) { | |
265 _array->set_offset_array(start_index, boundary, blk_start); | |
266 break; | |
267 } // Else fall through to the next case | |
268 } | |
269 case Action_single: { | |
270 _array->set_offset_array(start_index, boundary, blk_start); | |
271 // We have finished marking the "offset card". We need to now | |
272 // mark the subsequent cards that this blk spans. | |
273 if (start_index < end_index) { | |
274 HeapWord* rem_st = _array->address_for_index(start_index) + N_words; | |
275 HeapWord* rem_end = _array->address_for_index(end_index) + N_words; | |
276 set_remainder_to_point_to_start(rem_st, rem_end); | |
277 } | |
278 break; | |
279 } | |
280 case Action_check: { | |
281 _array->check_offset_array(start_index, boundary, blk_start); | |
282 // We have finished checking the "offset card". We need to now | |
283 // check the subsequent cards that this blk spans. | |
284 check_all_cards(start_index + 1, end_index); | |
285 break; | |
286 } | |
287 default: | |
288 ShouldNotReachHere(); | |
289 } | |
290 } | |
291 } | |
292 | |
293 // The card-interval [start_card, end_card] is a closed interval; this | |
294 // is an expensive check -- use with care and only under protection of | |
295 // suitable flag. | |
296 void G1BlockOffsetArray::check_all_cards(size_t start_card, size_t end_card) const { | |
297 | |
298 if (end_card < start_card) { | |
299 return; | |
300 } | |
301 guarantee(_array->offset_array(start_card) == N_words, "Wrong value in second card"); | |
302 for (size_t c = start_card + 1; c <= end_card; c++ /* yeah! */) { | |
303 u_char entry = _array->offset_array(c); | |
304 if (c - start_card > BlockOffsetArray::power_to_cards_back(1)) { | |
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305 guarantee(entry > N_words, |
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306 err_msg("Should be in logarithmic region - " |
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307 "entry: " UINT32_FORMAT ", " |
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308 "_array->offset_array(c): " UINT32_FORMAT ", " |
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309 "N_words: " UINT32_FORMAT, |
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310 entry, _array->offset_array(c), N_words)); |
342 | 311 } |
312 size_t backskip = BlockOffsetArray::entry_to_cards_back(entry); | |
313 size_t landing_card = c - backskip; | |
314 guarantee(landing_card >= (start_card - 1), "Inv"); | |
315 if (landing_card >= start_card) { | |
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316 guarantee(_array->offset_array(landing_card) <= entry, |
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317 err_msg("Monotonicity - landing_card offset: " UINT32_FORMAT ", " |
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318 "entry: " UINT32_FORMAT, |
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319 _array->offset_array(landing_card), entry)); |
342 | 320 } else { |
321 guarantee(landing_card == start_card - 1, "Tautology"); | |
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322 // Note that N_words is the maximum offset value |
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323 guarantee(_array->offset_array(landing_card) <= N_words, |
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324 err_msg("landing card offset: " UINT32_FORMAT ", " |
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325 "N_words: " UINT32_FORMAT, |
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326 _array->offset_array(landing_card), N_words)); |
342 | 327 } |
328 } | |
329 } | |
330 | |
331 // The range [blk_start, blk_end) represents a single contiguous block | |
332 // of storage; modify the block offset table to represent this | |
333 // information; Right-open interval: [blk_start, blk_end) | |
334 // NOTE: this method does _not_ adjust _unallocated_block. | |
335 void | |
336 G1BlockOffsetArray::single_block(HeapWord* blk_start, HeapWord* blk_end) { | |
337 do_block_internal(blk_start, blk_end, Action_single); | |
338 } | |
339 | |
340 // Mark the BOT such that if [blk_start, blk_end) straddles a card | |
341 // boundary, the card following the first such boundary is marked | |
342 // with the appropriate offset. | |
343 // NOTE: this method does _not_ adjust _unallocated_block or | |
344 // any cards subsequent to the first one. | |
345 void | |
346 G1BlockOffsetArray::mark_block(HeapWord* blk_start, HeapWord* blk_end) { | |
347 do_block_internal(blk_start, blk_end, Action_mark); | |
348 } | |
349 | |
350 HeapWord* G1BlockOffsetArray::block_start_unsafe(const void* addr) { | |
351 assert(_bottom <= addr && addr < _end, | |
352 "addr must be covered by this Array"); | |
353 // Must read this exactly once because it can be modified by parallel | |
354 // allocation. | |
355 HeapWord* ub = _unallocated_block; | |
356 if (BlockOffsetArrayUseUnallocatedBlock && addr >= ub) { | |
357 assert(ub < _end, "tautology (see above)"); | |
358 return ub; | |
359 } | |
360 // Otherwise, find the block start using the table. | |
361 HeapWord* q = block_at_or_preceding(addr, false, 0); | |
362 return forward_to_block_containing_addr(q, addr); | |
363 } | |
364 | |
365 // This duplicates a little code from the above: unavoidable. | |
366 HeapWord* | |
367 G1BlockOffsetArray::block_start_unsafe_const(const void* addr) const { | |
368 assert(_bottom <= addr && addr < _end, | |
369 "addr must be covered by this Array"); | |
370 // Must read this exactly once because it can be modified by parallel | |
371 // allocation. | |
372 HeapWord* ub = _unallocated_block; | |
373 if (BlockOffsetArrayUseUnallocatedBlock && addr >= ub) { | |
374 assert(ub < _end, "tautology (see above)"); | |
375 return ub; | |
376 } | |
377 // Otherwise, find the block start using the table. | |
378 HeapWord* q = block_at_or_preceding(addr, false, 0); | |
379 HeapWord* n = q + _sp->block_size(q); | |
380 return forward_to_block_containing_addr_const(q, n, addr); | |
381 } | |
382 | |
383 | |
384 HeapWord* | |
385 G1BlockOffsetArray::forward_to_block_containing_addr_slow(HeapWord* q, | |
386 HeapWord* n, | |
387 const void* addr) { | |
388 // We're not in the normal case. We need to handle an important subcase | |
389 // here: LAB allocation. An allocation previously recorded in the | |
390 // offset table was actually a lab allocation, and was divided into | |
391 // several objects subsequently. Fix this situation as we answer the | |
392 // query, by updating entries as we cross them. | |
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394 // If the fist object's end q is at the card boundary. Start refining |
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395 // with the corresponding card (the value of the entry will be basically |
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396 // set to 0). If the object crosses the boundary -- start from the next card. |
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397 size_t n_index = _array->index_for(n); |
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398 size_t next_index = _array->index_for(n) + !_array->is_card_boundary(n); |
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399 // Calculate a consistent next boundary. If "n" is not at the boundary |
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400 // already, step to the boundary. |
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401 HeapWord* next_boundary = _array->address_for_index(n_index) + |
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402 (n_index == next_index ? 0 : N_words); |
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403 assert(next_boundary <= _array->_end, |
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404 err_msg("next_boundary is beyond the end of the covered region " |
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405 " next_boundary " PTR_FORMAT " _array->_end " PTR_FORMAT, |
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406 next_boundary, _array->_end)); |
342 | 407 if (csp() != NULL) { |
408 if (addr >= csp()->top()) return csp()->top(); | |
409 while (next_boundary < addr) { | |
410 while (n <= next_boundary) { | |
411 q = n; | |
412 oop obj = oop(q); | |
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413 if (obj->klass_or_null() == NULL) return q; |
342 | 414 n += obj->size(); |
415 } | |
416 assert(q <= next_boundary && n > next_boundary, "Consequence of loop"); | |
417 // [q, n) is the block that crosses the boundary. | |
418 alloc_block_work2(&next_boundary, &next_index, q, n); | |
419 } | |
420 } else { | |
421 while (next_boundary < addr) { | |
422 while (n <= next_boundary) { | |
423 q = n; | |
424 oop obj = oop(q); | |
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425 if (obj->klass_or_null() == NULL) return q; |
342 | 426 n += _sp->block_size(q); |
427 } | |
428 assert(q <= next_boundary && n > next_boundary, "Consequence of loop"); | |
429 // [q, n) is the block that crosses the boundary. | |
430 alloc_block_work2(&next_boundary, &next_index, q, n); | |
431 } | |
432 } | |
433 return forward_to_block_containing_addr_const(q, n, addr); | |
434 } | |
435 | |
436 HeapWord* G1BlockOffsetArray::block_start_careful(const void* addr) const { | |
437 assert(_array->offset_array(0) == 0, "objects can't cross covered areas"); | |
438 | |
439 assert(_bottom <= addr && addr < _end, | |
440 "addr must be covered by this Array"); | |
441 // Must read this exactly once because it can be modified by parallel | |
442 // allocation. | |
443 HeapWord* ub = _unallocated_block; | |
444 if (BlockOffsetArrayUseUnallocatedBlock && addr >= ub) { | |
445 assert(ub < _end, "tautology (see above)"); | |
446 return ub; | |
447 } | |
448 | |
449 // Otherwise, find the block start using the table, but taking | |
450 // care (cf block_start_unsafe() above) not to parse any objects/blocks | |
451 // on the cards themsleves. | |
452 size_t index = _array->index_for(addr); | |
453 assert(_array->address_for_index(index) == addr, | |
454 "arg should be start of card"); | |
455 | |
456 HeapWord* q = (HeapWord*)addr; | |
457 uint offset; | |
458 do { | |
459 offset = _array->offset_array(index--); | |
460 q -= offset; | |
461 } while (offset == N_words); | |
462 assert(q <= addr, "block start should be to left of arg"); | |
463 return q; | |
464 } | |
465 | |
466 // Note that the committed size of the covered space may have changed, | |
467 // so the table size might also wish to change. | |
468 void G1BlockOffsetArray::resize(size_t new_word_size) { | |
469 HeapWord* new_end = _bottom + new_word_size; | |
470 if (_end < new_end && !init_to_zero()) { | |
471 // verify that the old and new boundaries are also card boundaries | |
472 assert(_array->is_card_boundary(_end), | |
473 "_end not a card boundary"); | |
474 assert(_array->is_card_boundary(new_end), | |
475 "new _end would not be a card boundary"); | |
476 // set all the newly added cards | |
477 _array->set_offset_array(_end, new_end, N_words); | |
478 } | |
479 _end = new_end; // update _end | |
480 } | |
481 | |
482 void G1BlockOffsetArray::set_region(MemRegion mr) { | |
483 _bottom = mr.start(); | |
484 _end = mr.end(); | |
485 } | |
486 | |
487 // | |
488 // threshold_ | |
489 // | _index_ | |
490 // v v | |
491 // +-------+-------+-------+-------+-------+ | |
492 // | i-1 | i | i+1 | i+2 | i+3 | | |
493 // +-------+-------+-------+-------+-------+ | |
494 // ( ^ ] | |
495 // block-start | |
496 // | |
497 void G1BlockOffsetArray::alloc_block_work2(HeapWord** threshold_, size_t* index_, | |
498 HeapWord* blk_start, HeapWord* blk_end) { | |
499 // For efficiency, do copy-in/copy-out. | |
500 HeapWord* threshold = *threshold_; | |
501 size_t index = *index_; | |
502 | |
503 assert(blk_start != NULL && blk_end > blk_start, | |
504 "phantom block"); | |
505 assert(blk_end > threshold, "should be past threshold"); | |
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506 assert(blk_start <= threshold, "blk_start should be at or before threshold"); |
342 | 507 assert(pointer_delta(threshold, blk_start) <= N_words, |
508 "offset should be <= BlockOffsetSharedArray::N"); | |
509 assert(Universe::heap()->is_in_reserved(blk_start), | |
510 "reference must be into the heap"); | |
511 assert(Universe::heap()->is_in_reserved(blk_end-1), | |
512 "limit must be within the heap"); | |
513 assert(threshold == _array->_reserved.start() + index*N_words, | |
514 "index must agree with threshold"); | |
515 | |
516 DEBUG_ONLY(size_t orig_index = index;) | |
517 | |
518 // Mark the card that holds the offset into the block. Note | |
519 // that _next_offset_index and _next_offset_threshold are not | |
520 // updated until the end of this method. | |
521 _array->set_offset_array(index, threshold, blk_start); | |
522 | |
523 // We need to now mark the subsequent cards that this blk spans. | |
524 | |
525 // Index of card on which blk ends. | |
526 size_t end_index = _array->index_for(blk_end - 1); | |
527 | |
528 // Are there more cards left to be updated? | |
529 if (index + 1 <= end_index) { | |
530 HeapWord* rem_st = _array->address_for_index(index + 1); | |
531 // Calculate rem_end this way because end_index | |
532 // may be the last valid index in the covered region. | |
533 HeapWord* rem_end = _array->address_for_index(end_index) + N_words; | |
534 set_remainder_to_point_to_start(rem_st, rem_end); | |
535 } | |
536 | |
537 index = end_index + 1; | |
538 // Calculate threshold_ this way because end_index | |
539 // may be the last valid index in the covered region. | |
540 threshold = _array->address_for_index(end_index) + N_words; | |
541 assert(threshold >= blk_end, "Incorrect offset threshold"); | |
542 | |
543 // index_ and threshold_ updated here. | |
544 *threshold_ = threshold; | |
545 *index_ = index; | |
546 | |
547 #ifdef ASSERT | |
548 // The offset can be 0 if the block starts on a boundary. That | |
549 // is checked by an assertion above. | |
550 size_t start_index = _array->index_for(blk_start); | |
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551 HeapWord* boundary = _array->address_for_index(start_index); |
342 | 552 assert((_array->offset_array(orig_index) == 0 && |
553 blk_start == boundary) || | |
554 (_array->offset_array(orig_index) > 0 && | |
555 _array->offset_array(orig_index) <= N_words), | |
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556 err_msg("offset array should have been set - " |
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557 "orig_index offset: " UINT32_FORMAT ", " |
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558 "blk_start: " PTR_FORMAT ", " |
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559 "boundary: " PTR_FORMAT, |
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560 _array->offset_array(orig_index), |
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561 blk_start, boundary)); |
342 | 562 for (size_t j = orig_index + 1; j <= end_index; j++) { |
563 assert(_array->offset_array(j) > 0 && | |
564 _array->offset_array(j) <= | |
565 (u_char) (N_words+BlockOffsetArray::N_powers-1), | |
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566 err_msg("offset array should have been set - " |
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567 UINT32_FORMAT " not > 0 OR " |
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568 UINT32_FORMAT " not <= " UINT32_FORMAT, |
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569 _array->offset_array(j), |
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570 _array->offset_array(j), |
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571 (u_char) (N_words+BlockOffsetArray::N_powers-1))); |
342 | 572 } |
573 #endif | |
574 } | |
575 | |
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576 bool |
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577 G1BlockOffsetArray::verify_for_object(HeapWord* obj_start, |
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578 size_t word_size) const { |
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579 size_t first_card = _array->index_for(obj_start); |
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580 size_t last_card = _array->index_for(obj_start + word_size - 1); |
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581 if (!_array->is_card_boundary(obj_start)) { |
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582 // If the object is not on a card boundary the BOT entry of the |
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583 // first card should point to another object so we should not |
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584 // check that one. |
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585 first_card += 1; |
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586 } |
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587 for (size_t card = first_card; card <= last_card; card += 1) { |
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588 HeapWord* card_addr = _array->address_for_index(card); |
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589 HeapWord* block_start = block_start_const(card_addr); |
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590 if (block_start != obj_start) { |
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591 gclog_or_tty->print_cr("block start: "PTR_FORMAT" is incorrect - " |
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592 "card index: "SIZE_FORMAT" " |
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593 "card addr: "PTR_FORMAT" BOT entry: %u " |
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594 "obj: "PTR_FORMAT" word size: "SIZE_FORMAT" " |
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595 "cards: ["SIZE_FORMAT","SIZE_FORMAT"]", |
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596 block_start, card, card_addr, |
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597 _array->offset_array(card), |
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598 obj_start, word_size, first_card, last_card); |
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599 return false; |
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600 } |
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601 } |
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602 return true; |
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603 } |
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604 |
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605 #ifndef PRODUCT |
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606 void |
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607 G1BlockOffsetArray::print_on(outputStream* out) { |
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608 size_t from_index = _array->index_for(_bottom); |
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609 size_t to_index = _array->index_for(_end); |
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610 out->print_cr(">> BOT for area ["PTR_FORMAT","PTR_FORMAT") " |
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611 "cards ["SIZE_FORMAT","SIZE_FORMAT")", |
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612 _bottom, _end, from_index, to_index); |
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613 for (size_t i = from_index; i < to_index; ++i) { |
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614 out->print_cr(" entry "SIZE_FORMAT_W(8)" | "PTR_FORMAT" : %3u", |
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615 i, _array->address_for_index(i), |
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616 (uint) _array->offset_array(i)); |
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617 } |
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618 } |
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619 #endif // !PRODUCT |
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620 |
342 | 621 ////////////////////////////////////////////////////////////////////// |
622 // G1BlockOffsetArrayContigSpace | |
623 ////////////////////////////////////////////////////////////////////// | |
624 | |
625 HeapWord* | |
626 G1BlockOffsetArrayContigSpace::block_start_unsafe(const void* addr) { | |
627 assert(_bottom <= addr && addr < _end, | |
628 "addr must be covered by this Array"); | |
629 HeapWord* q = block_at_or_preceding(addr, true, _next_offset_index-1); | |
630 return forward_to_block_containing_addr(q, addr); | |
631 } | |
632 | |
633 HeapWord* | |
634 G1BlockOffsetArrayContigSpace:: | |
635 block_start_unsafe_const(const void* addr) const { | |
636 assert(_bottom <= addr && addr < _end, | |
637 "addr must be covered by this Array"); | |
638 HeapWord* q = block_at_or_preceding(addr, true, _next_offset_index-1); | |
639 HeapWord* n = q + _sp->block_size(q); | |
640 return forward_to_block_containing_addr_const(q, n, addr); | |
641 } | |
642 | |
643 G1BlockOffsetArrayContigSpace:: | |
644 G1BlockOffsetArrayContigSpace(G1BlockOffsetSharedArray* array, | |
645 MemRegion mr) : | |
646 G1BlockOffsetArray(array, mr, true) | |
647 { | |
648 _next_offset_threshold = NULL; | |
649 _next_offset_index = 0; | |
650 } | |
651 | |
652 HeapWord* G1BlockOffsetArrayContigSpace::initialize_threshold() { | |
653 assert(!Universe::heap()->is_in_reserved(_array->_offset_array), | |
654 "just checking"); | |
655 _next_offset_index = _array->index_for(_bottom); | |
656 _next_offset_index++; | |
657 _next_offset_threshold = | |
658 _array->address_for_index(_next_offset_index); | |
659 return _next_offset_threshold; | |
660 } | |
661 | |
662 void G1BlockOffsetArrayContigSpace::zero_bottom_entry() { | |
663 assert(!Universe::heap()->is_in_reserved(_array->_offset_array), | |
664 "just checking"); | |
665 size_t bottom_index = _array->index_for(_bottom); | |
666 assert(_array->address_for_index(bottom_index) == _bottom, | |
667 "Precondition of call"); | |
668 _array->set_offset_array(bottom_index, 0); | |
669 } | |
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670 |
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671 void |
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672 G1BlockOffsetArrayContigSpace::set_for_starts_humongous(HeapWord* new_top) { |
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673 assert(new_top <= _end, "_end should have already been updated"); |
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674 |
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675 // The first BOT entry should have offset 0. |
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676 zero_bottom_entry(); |
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677 initialize_threshold(); |
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678 alloc_block(_bottom, new_top); |
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679 } |
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680 |
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681 #ifndef PRODUCT |
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682 void |
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683 G1BlockOffsetArrayContigSpace::print_on(outputStream* out) { |
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684 G1BlockOffsetArray::print_on(out); |
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685 out->print_cr(" next offset threshold: "PTR_FORMAT, _next_offset_threshold); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
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686 out->print_cr(" next offset index: "SIZE_FORMAT, _next_offset_index); |
1886
72a161e62cc4
6991377: G1: race between concurrent refinement and humongous object allocation
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687 } |
2133
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tonyp
parents:
1972
diff
changeset
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688 #endif // !PRODUCT |