Mercurial > hg > truffle
annotate src/share/vm/memory/tenuredGeneration.cpp @ 8712:3efdfd6ddbf2
8003553: NPG: metaspace objects should be zeroed in constructors
Summary: Zero metadata in constructors, not in allocation (and some in constructors)
Reviewed-by: jmasa, sspitsyn
author | coleenp |
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date | Fri, 08 Mar 2013 11:47:57 -0500 |
parents | db9981fd3124 |
children | 8617e38bb4cb |
rev | line source |
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0 | 1 /* |
6595 | 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/shared/collectorCounters.hpp" | |
6595 | 27 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 28 #include "memory/allocation.inline.hpp" |
29 #include "memory/blockOffsetTable.inline.hpp" | |
30 #include "memory/generation.inline.hpp" | |
31 #include "memory/generationSpec.hpp" | |
32 #include "memory/space.hpp" | |
33 #include "memory/tenuredGeneration.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "runtime/java.hpp" | |
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36 #include "utilities/macros.hpp" |
0 | 37 |
38 TenuredGeneration::TenuredGeneration(ReservedSpace rs, | |
39 size_t initial_byte_size, int level, | |
40 GenRemSet* remset) : | |
41 OneContigSpaceCardGeneration(rs, initial_byte_size, | |
42 MinHeapDeltaBytes, level, remset, NULL) | |
43 { | |
44 HeapWord* bottom = (HeapWord*) _virtual_space.low(); | |
45 HeapWord* end = (HeapWord*) _virtual_space.high(); | |
46 _the_space = new TenuredSpace(_bts, MemRegion(bottom, end)); | |
47 _the_space->reset_saved_mark(); | |
48 _shrink_factor = 0; | |
49 _capacity_at_prologue = 0; | |
50 | |
51 _gc_stats = new GCStats(); | |
52 | |
53 // initialize performance counters | |
54 | |
55 const char* gen_name = "old"; | |
56 | |
57 // Generation Counters -- generation 1, 1 subspace | |
58 _gen_counters = new GenerationCounters(gen_name, 1, 1, &_virtual_space); | |
59 | |
60 _gc_counters = new CollectorCounters("MSC", 1); | |
61 | |
62 _space_counters = new CSpaceCounters(gen_name, 0, | |
63 _virtual_space.reserved_size(), | |
64 _the_space, _gen_counters); | |
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65 #if INCLUDE_ALL_GCS |
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66 if (UseParNewGC) { |
0 | 67 typedef ParGCAllocBufferWithBOT* ParGCAllocBufferWithBOTPtr; |
68 _alloc_buffers = NEW_C_HEAP_ARRAY(ParGCAllocBufferWithBOTPtr, | |
6197 | 69 ParallelGCThreads, mtGC); |
0 | 70 if (_alloc_buffers == NULL) |
71 vm_exit_during_initialization("Could not allocate alloc_buffers"); | |
72 for (uint i = 0; i < ParallelGCThreads; i++) { | |
73 _alloc_buffers[i] = | |
74 new ParGCAllocBufferWithBOT(OldPLABSize, _bts); | |
75 if (_alloc_buffers[i] == NULL) | |
76 vm_exit_during_initialization("Could not allocate alloc_buffers"); | |
77 } | |
78 } else { | |
79 _alloc_buffers = NULL; | |
80 } | |
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81 #endif // INCLUDE_ALL_GCS |
0 | 82 } |
83 | |
84 | |
85 const char* TenuredGeneration::name() const { | |
86 return "tenured generation"; | |
87 } | |
88 | |
89 void TenuredGeneration::compute_new_size() { | |
90 assert(_shrink_factor <= 100, "invalid shrink factor"); | |
91 size_t current_shrink_factor = _shrink_factor; | |
92 _shrink_factor = 0; | |
93 | |
94 // We don't have floating point command-line arguments | |
95 // Note: argument processing ensures that MinHeapFreeRatio < 100. | |
96 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; | |
97 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
98 | |
99 // Compute some numbers about the state of the heap. | |
100 const size_t used_after_gc = used(); | |
101 const size_t capacity_after_gc = capacity(); | |
102 | |
103 const double min_tmp = used_after_gc / maximum_used_percentage; | |
104 size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); | |
105 // Don't shrink less than the initial generation size | |
106 minimum_desired_capacity = MAX2(minimum_desired_capacity, | |
107 spec()->init_size()); | |
108 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
109 | |
110 if (PrintGC && Verbose) { | |
111 const size_t free_after_gc = free(); | |
112 const double free_percentage = ((double)free_after_gc) / capacity_after_gc; | |
113 gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); | |
114 gclog_or_tty->print_cr(" " | |
115 " minimum_free_percentage: %6.2f" | |
116 " maximum_used_percentage: %6.2f", | |
117 minimum_free_percentage, | |
118 maximum_used_percentage); | |
119 gclog_or_tty->print_cr(" " | |
120 " free_after_gc : %6.1fK" | |
121 " used_after_gc : %6.1fK" | |
122 " capacity_after_gc : %6.1fK", | |
123 free_after_gc / (double) K, | |
124 used_after_gc / (double) K, | |
125 capacity_after_gc / (double) K); | |
126 gclog_or_tty->print_cr(" " | |
127 " free_percentage: %6.2f", | |
128 free_percentage); | |
129 } | |
130 | |
131 if (capacity_after_gc < minimum_desired_capacity) { | |
132 // If we have less free space than we want then expand | |
133 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
134 // Don't expand unless it's significant | |
135 if (expand_bytes >= _min_heap_delta_bytes) { | |
136 expand(expand_bytes, 0); // safe if expansion fails | |
137 } | |
138 if (PrintGC && Verbose) { | |
139 gclog_or_tty->print_cr(" expanding:" | |
140 " minimum_desired_capacity: %6.1fK" | |
141 " expand_bytes: %6.1fK" | |
142 " _min_heap_delta_bytes: %6.1fK", | |
143 minimum_desired_capacity / (double) K, | |
144 expand_bytes / (double) K, | |
145 _min_heap_delta_bytes / (double) K); | |
146 } | |
147 return; | |
148 } | |
149 | |
150 // No expansion, now see if we want to shrink | |
151 size_t shrink_bytes = 0; | |
152 // We would never want to shrink more than this | |
153 size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; | |
154 | |
155 if (MaxHeapFreeRatio < 100) { | |
156 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; | |
157 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
158 const double max_tmp = used_after_gc / minimum_used_percentage; | |
159 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); | |
160 maximum_desired_capacity = MAX2(maximum_desired_capacity, | |
161 spec()->init_size()); | |
162 if (PrintGC && Verbose) { | |
163 gclog_or_tty->print_cr(" " | |
164 " maximum_free_percentage: %6.2f" | |
165 " minimum_used_percentage: %6.2f", | |
166 maximum_free_percentage, | |
167 minimum_used_percentage); | |
168 gclog_or_tty->print_cr(" " | |
169 " _capacity_at_prologue: %6.1fK" | |
170 " minimum_desired_capacity: %6.1fK" | |
171 " maximum_desired_capacity: %6.1fK", | |
172 _capacity_at_prologue / (double) K, | |
173 minimum_desired_capacity / (double) K, | |
174 maximum_desired_capacity / (double) K); | |
175 } | |
176 assert(minimum_desired_capacity <= maximum_desired_capacity, | |
177 "sanity check"); | |
178 | |
179 if (capacity_after_gc > maximum_desired_capacity) { | |
180 // Capacity too large, compute shrinking size | |
181 shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
182 // We don't want shrink all the way back to initSize if people call | |
183 // System.gc(), because some programs do that between "phases" and then | |
184 // we'd just have to grow the heap up again for the next phase. So we | |
185 // damp the shrinking: 0% on the first call, 10% on the second call, 40% | |
186 // on the third call, and 100% by the fourth call. But if we recompute | |
187 // size without shrinking, it goes back to 0%. | |
188 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; | |
189 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); | |
190 if (current_shrink_factor == 0) { | |
191 _shrink_factor = 10; | |
192 } else { | |
193 _shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); | |
194 } | |
195 if (PrintGC && Verbose) { | |
196 gclog_or_tty->print_cr(" " | |
197 " shrinking:" | |
198 " initSize: %.1fK" | |
199 " maximum_desired_capacity: %.1fK", | |
200 spec()->init_size() / (double) K, | |
201 maximum_desired_capacity / (double) K); | |
202 gclog_or_tty->print_cr(" " | |
203 " shrink_bytes: %.1fK" | |
204 " current_shrink_factor: %d" | |
205 " new shrink factor: %d" | |
206 " _min_heap_delta_bytes: %.1fK", | |
207 shrink_bytes / (double) K, | |
208 current_shrink_factor, | |
209 _shrink_factor, | |
210 _min_heap_delta_bytes / (double) K); | |
211 } | |
212 } | |
213 } | |
214 | |
215 if (capacity_after_gc > _capacity_at_prologue) { | |
216 // We might have expanded for promotions, in which case we might want to | |
217 // take back that expansion if there's room after GC. That keeps us from | |
218 // stretching the heap with promotions when there's plenty of room. | |
219 size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; | |
220 expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); | |
221 // We have two shrinking computations, take the largest | |
222 shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); | |
223 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); | |
224 if (PrintGC && Verbose) { | |
225 gclog_or_tty->print_cr(" " | |
226 " aggressive shrinking:" | |
227 " _capacity_at_prologue: %.1fK" | |
228 " capacity_after_gc: %.1fK" | |
229 " expansion_for_promotion: %.1fK" | |
230 " shrink_bytes: %.1fK", | |
231 capacity_after_gc / (double) K, | |
232 _capacity_at_prologue / (double) K, | |
233 expansion_for_promotion / (double) K, | |
234 shrink_bytes / (double) K); | |
235 } | |
236 } | |
237 // Don't shrink unless it's significant | |
238 if (shrink_bytes >= _min_heap_delta_bytes) { | |
239 shrink(shrink_bytes); | |
240 } | |
241 assert(used() == used_after_gc && used_after_gc <= capacity(), | |
242 "sanity check"); | |
243 } | |
244 | |
245 void TenuredGeneration::gc_prologue(bool full) { | |
246 _capacity_at_prologue = capacity(); | |
247 _used_at_prologue = used(); | |
248 if (VerifyBeforeGC) { | |
249 verify_alloc_buffers_clean(); | |
250 } | |
251 } | |
252 | |
253 void TenuredGeneration::gc_epilogue(bool full) { | |
254 if (VerifyAfterGC) { | |
255 verify_alloc_buffers_clean(); | |
256 } | |
257 OneContigSpaceCardGeneration::gc_epilogue(full); | |
258 } | |
259 | |
260 | |
261 bool TenuredGeneration::should_collect(bool full, | |
262 size_t size, | |
263 bool is_tlab) { | |
264 // This should be one big conditional or (||), but I want to be able to tell | |
265 // why it returns what it returns (without re-evaluating the conditionals | |
266 // in case they aren't idempotent), so I'm doing it this way. | |
267 // DeMorgan says it's okay. | |
268 bool result = false; | |
269 if (!result && full) { | |
270 result = true; | |
271 if (PrintGC && Verbose) { | |
272 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
273 " full"); | |
274 } | |
275 } | |
276 if (!result && should_allocate(size, is_tlab)) { | |
277 result = true; | |
278 if (PrintGC && Verbose) { | |
279 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
280 " should_allocate(" SIZE_FORMAT ")", | |
281 size); | |
282 } | |
283 } | |
284 // If we don't have very much free space. | |
285 // XXX: 10000 should be a percentage of the capacity!!! | |
286 if (!result && free() < 10000) { | |
287 result = true; | |
288 if (PrintGC && Verbose) { | |
289 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
290 " free(): " SIZE_FORMAT, | |
291 free()); | |
292 } | |
293 } | |
294 // If we had to expand to accomodate promotions from younger generations | |
295 if (!result && _capacity_at_prologue < capacity()) { | |
296 result = true; | |
297 if (PrintGC && Verbose) { | |
298 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
299 "_capacity_at_prologue: " SIZE_FORMAT " < capacity(): " SIZE_FORMAT, | |
300 _capacity_at_prologue, capacity()); | |
301 } | |
302 } | |
303 return result; | |
304 } | |
305 | |
306 void TenuredGeneration::collect(bool full, | |
307 bool clear_all_soft_refs, | |
308 size_t size, | |
309 bool is_tlab) { | |
310 retire_alloc_buffers_before_full_gc(); | |
311 OneContigSpaceCardGeneration::collect(full, clear_all_soft_refs, | |
312 size, is_tlab); | |
313 } | |
314 | |
315 void TenuredGeneration::update_gc_stats(int current_level, | |
316 bool full) { | |
317 // If the next lower level(s) has been collected, gather any statistics | |
318 // that are of interest at this point. | |
319 if (!full && (current_level + 1) == level()) { | |
320 // Calculate size of data promoted from the younger generations | |
321 // before doing the collection. | |
322 size_t used_before_gc = used(); | |
323 | |
324 // If the younger gen collections were skipped, then the | |
325 // number of promoted bytes will be 0 and adding it to the | |
326 // average will incorrectly lessen the average. It is, however, | |
327 // also possible that no promotion was needed. | |
328 if (used_before_gc >= _used_at_prologue) { | |
329 size_t promoted_in_bytes = used_before_gc - _used_at_prologue; | |
330 gc_stats()->avg_promoted()->sample(promoted_in_bytes); | |
331 } | |
332 } | |
333 } | |
334 | |
335 void TenuredGeneration::update_counters() { | |
336 if (UsePerfData) { | |
337 _space_counters->update_all(); | |
338 _gen_counters->update_all(); | |
339 } | |
340 } | |
341 | |
342 | |
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343 #if INCLUDE_ALL_GCS |
0 | 344 oop TenuredGeneration::par_promote(int thread_num, |
345 oop old, markOop m, size_t word_sz) { | |
346 | |
347 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
348 HeapWord* obj_ptr = buf->allocate(word_sz); | |
349 bool is_lab = true; | |
350 if (obj_ptr == NULL) { | |
351 #ifndef PRODUCT | |
352 if (Universe::heap()->promotion_should_fail()) { | |
353 return NULL; | |
354 } | |
355 #endif // #ifndef PRODUCT | |
356 | |
357 // Slow path: | |
358 if (word_sz * 100 < ParallelGCBufferWastePct * buf->word_sz()) { | |
359 // Is small enough; abandon this buffer and start a new one. | |
360 size_t buf_size = buf->word_sz(); | |
361 HeapWord* buf_space = | |
362 TenuredGeneration::par_allocate(buf_size, false); | |
363 if (buf_space == NULL) { | |
364 buf_space = expand_and_allocate(buf_size, false, true /* parallel*/); | |
365 } | |
366 if (buf_space != NULL) { | |
367 buf->retire(false, false); | |
368 buf->set_buf(buf_space); | |
369 obj_ptr = buf->allocate(word_sz); | |
370 assert(obj_ptr != NULL, "Buffer was definitely big enough..."); | |
371 } | |
372 }; | |
373 // Otherwise, buffer allocation failed; try allocating object | |
374 // individually. | |
375 if (obj_ptr == NULL) { | |
376 obj_ptr = TenuredGeneration::par_allocate(word_sz, false); | |
377 if (obj_ptr == NULL) { | |
378 obj_ptr = expand_and_allocate(word_sz, false, true /* parallel */); | |
379 } | |
380 } | |
381 if (obj_ptr == NULL) return NULL; | |
382 } | |
383 assert(obj_ptr != NULL, "program logic"); | |
384 Copy::aligned_disjoint_words((HeapWord*)old, obj_ptr, word_sz); | |
385 oop obj = oop(obj_ptr); | |
386 // Restore the mark word copied above. | |
387 obj->set_mark(m); | |
388 return obj; | |
389 } | |
390 | |
391 void TenuredGeneration::par_promote_alloc_undo(int thread_num, | |
392 HeapWord* obj, | |
393 size_t word_sz) { | |
394 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
395 if (buf->contains(obj)) { | |
396 guarantee(buf->contains(obj + word_sz - 1), | |
397 "should contain whole object"); | |
398 buf->undo_allocation(obj, word_sz); | |
399 } else { | |
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400 CollectedHeap::fill_with_object(obj, word_sz); |
0 | 401 } |
402 } | |
403 | |
404 void TenuredGeneration::par_promote_alloc_done(int thread_num) { | |
405 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
406 buf->retire(true, ParallelGCRetainPLAB); | |
407 } | |
408 | |
409 void TenuredGeneration::retire_alloc_buffers_before_full_gc() { | |
410 if (UseParNewGC) { | |
411 for (uint i = 0; i < ParallelGCThreads; i++) { | |
412 _alloc_buffers[i]->retire(true /*end_of_gc*/, false /*retain*/); | |
413 } | |
414 } | |
415 } | |
416 | |
417 // Verify that any retained parallel allocation buffers do not | |
418 // intersect with dirty cards. | |
419 void TenuredGeneration::verify_alloc_buffers_clean() { | |
420 if (UseParNewGC) { | |
421 for (uint i = 0; i < ParallelGCThreads; i++) { | |
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422 _rs->verify_aligned_region_empty(_alloc_buffers[i]->range()); |
0 | 423 } |
424 } | |
425 } | |
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426 |
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427 #else // INCLUDE_ALL_GCS |
0 | 428 void TenuredGeneration::retire_alloc_buffers_before_full_gc() {} |
429 void TenuredGeneration::verify_alloc_buffers_clean() {} | |
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430 #endif // INCLUDE_ALL_GCS |
0 | 431 |
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432 bool TenuredGeneration::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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433 size_t available = max_contiguous_available(); |
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434 size_t av_promo = (size_t)gc_stats()->avg_promoted()->padded_average(); |
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435 bool res = (available >= av_promo) || (available >= max_promotion_in_bytes); |
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436 if (PrintGC && Verbose) { |
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437 gclog_or_tty->print_cr( |
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438 "Tenured: promo attempt is%s safe: available("SIZE_FORMAT") %s av_promo("SIZE_FORMAT")," |
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439 "max_promo("SIZE_FORMAT")", |
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440 res? "":" not", available, res? ">=":"<", |
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441 av_promo, max_promotion_in_bytes); |
0 | 442 } |
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443 return res; |
0 | 444 } |