Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/generation.cpp @ 9072:8617e38bb4cb
8008508: CMS does not correctly reduce heap size after a Full GC
Reviewed-by: johnc, ysr
author | jmasa |
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date | Mon, 11 Feb 2013 10:31:56 -0800 |
parents | da91efe96a93 |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 1997, 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/spaceDecorator.hpp" | |
27 #include "gc_interface/collectedHeap.inline.hpp" | |
28 #include "memory/allocation.inline.hpp" | |
29 #include "memory/blockOffsetTable.inline.hpp" | |
30 #include "memory/cardTableRS.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "memory/genCollectedHeap.hpp" | |
33 #include "memory/genMarkSweep.hpp" | |
34 #include "memory/genOopClosures.hpp" | |
35 #include "memory/genOopClosures.inline.hpp" | |
36 #include "memory/generation.hpp" | |
37 #include "memory/generation.inline.hpp" | |
38 #include "memory/space.inline.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/java.hpp" | |
41 #include "utilities/copy.hpp" | |
42 #include "utilities/events.hpp" | |
0 | 43 |
44 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) : | |
45 _level(level), | |
46 _ref_processor(NULL) { | |
47 if (!_virtual_space.initialize(rs, initial_size)) { | |
48 vm_exit_during_initialization("Could not reserve enough space for " | |
49 "object heap"); | |
50 } | |
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51 // Mangle all of the the initial generation. |
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52 if (ZapUnusedHeapArea) { |
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53 MemRegion mangle_region((HeapWord*)_virtual_space.low(), |
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54 (HeapWord*)_virtual_space.high()); |
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55 SpaceMangler::mangle_region(mangle_region); |
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56 } |
0 | 57 _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(), |
58 (HeapWord*)_virtual_space.high_boundary()); | |
59 } | |
60 | |
61 GenerationSpec* Generation::spec() { | |
62 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
63 assert(0 <= level() && level() < gch->_n_gens, "Bad gen level"); | |
64 return gch->_gen_specs[level()]; | |
65 } | |
66 | |
67 size_t Generation::max_capacity() const { | |
68 return reserved().byte_size(); | |
69 } | |
70 | |
71 void Generation::print_heap_change(size_t prev_used) const { | |
72 if (PrintGCDetails && Verbose) { | |
73 gclog_or_tty->print(" " SIZE_FORMAT | |
74 "->" SIZE_FORMAT | |
75 "(" SIZE_FORMAT ")", | |
76 prev_used, used(), capacity()); | |
77 } else { | |
78 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
79 "->" SIZE_FORMAT "K" | |
80 "(" SIZE_FORMAT "K)", | |
81 prev_used / K, used() / K, capacity() / K); | |
82 } | |
83 } | |
84 | |
85 // By default we get a single threaded default reference processor; | |
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86 // generations needing multi-threaded refs processing or discovery override this method. |
0 | 87 void Generation::ref_processor_init() { |
88 assert(_ref_processor == NULL, "a reference processor already exists"); | |
89 assert(!_reserved.is_empty(), "empty generation?"); | |
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90 _ref_processor = new ReferenceProcessor(_reserved); // a vanilla reference processor |
0 | 91 if (_ref_processor == NULL) { |
92 vm_exit_during_initialization("Could not allocate ReferenceProcessor object"); | |
93 } | |
94 } | |
95 | |
96 void Generation::print() const { print_on(tty); } | |
97 | |
98 void Generation::print_on(outputStream* st) const { | |
99 st->print(" %-20s", name()); | |
100 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
101 capacity()/K, used()/K); | |
102 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
103 _virtual_space.low_boundary(), | |
104 _virtual_space.high(), | |
105 _virtual_space.high_boundary()); | |
106 } | |
107 | |
108 void Generation::print_summary_info() { print_summary_info_on(tty); } | |
109 | |
110 void Generation::print_summary_info_on(outputStream* st) { | |
111 StatRecord* sr = stat_record(); | |
112 double time = sr->accumulated_time.seconds(); | |
113 st->print_cr("[Accumulated GC generation %d time %3.7f secs, " | |
114 "%d GC's, avg GC time %3.7f]", | |
115 level(), time, sr->invocations, | |
116 sr->invocations > 0 ? time / sr->invocations : 0.0); | |
117 } | |
118 | |
119 // Utility iterator classes | |
120 | |
121 class GenerationIsInReservedClosure : public SpaceClosure { | |
122 public: | |
123 const void* _p; | |
124 Space* sp; | |
125 virtual void do_space(Space* s) { | |
126 if (sp == NULL) { | |
127 if (s->is_in_reserved(_p)) sp = s; | |
128 } | |
129 } | |
130 GenerationIsInReservedClosure(const void* p) : _p(p), sp(NULL) {} | |
131 }; | |
132 | |
133 class GenerationIsInClosure : public SpaceClosure { | |
134 public: | |
135 const void* _p; | |
136 Space* sp; | |
137 virtual void do_space(Space* s) { | |
138 if (sp == NULL) { | |
139 if (s->is_in(_p)) sp = s; | |
140 } | |
141 } | |
142 GenerationIsInClosure(const void* p) : _p(p), sp(NULL) {} | |
143 }; | |
144 | |
145 bool Generation::is_in(const void* p) const { | |
146 GenerationIsInClosure blk(p); | |
147 ((Generation*)this)->space_iterate(&blk); | |
148 return blk.sp != NULL; | |
149 } | |
150 | |
151 DefNewGeneration* Generation::as_DefNewGeneration() { | |
152 assert((kind() == Generation::DefNew) || | |
153 (kind() == Generation::ParNew) || | |
154 (kind() == Generation::ASParNew), | |
155 "Wrong youngest generation type"); | |
156 return (DefNewGeneration*) this; | |
157 } | |
158 | |
159 Generation* Generation::next_gen() const { | |
160 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
161 int next = level() + 1; | |
162 if (next < gch->_n_gens) { | |
163 return gch->_gens[next]; | |
164 } else { | |
165 return NULL; | |
166 } | |
167 } | |
168 | |
169 size_t Generation::max_contiguous_available() const { | |
170 // The largest number of contiguous free words in this or any higher generation. | |
171 size_t max = 0; | |
172 for (const Generation* gen = this; gen != NULL; gen = gen->next_gen()) { | |
173 size_t avail = gen->contiguous_available(); | |
174 if (avail > max) { | |
175 max = avail; | |
176 } | |
177 } | |
178 return max; | |
179 } | |
180 | |
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181 bool Generation::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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182 size_t available = max_contiguous_available(); |
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183 bool res = (available >= max_promotion_in_bytes); |
0 | 184 if (PrintGC && Verbose) { |
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185 gclog_or_tty->print_cr( |
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186 "Generation: promo attempt is%s safe: available("SIZE_FORMAT") %s max_promo("SIZE_FORMAT")", |
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187 res? "":" not", available, res? ">=":"<", |
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188 max_promotion_in_bytes); |
0 | 189 } |
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190 return res; |
0 | 191 } |
192 | |
193 // Ignores "ref" and calls allocate(). | |
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194 oop Generation::promote(oop obj, size_t obj_size) { |
0 | 195 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
196 | |
197 #ifndef PRODUCT | |
198 if (Universe::heap()->promotion_should_fail()) { | |
199 return NULL; | |
200 } | |
201 #endif // #ifndef PRODUCT | |
202 | |
203 HeapWord* result = allocate(obj_size, false); | |
204 if (result != NULL) { | |
205 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
206 return oop(result); | |
207 } else { | |
208 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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209 return gch->handle_failed_promotion(this, obj, obj_size); |
0 | 210 } |
211 } | |
212 | |
213 oop Generation::par_promote(int thread_num, | |
214 oop obj, markOop m, size_t word_sz) { | |
215 // Could do a bad general impl here that gets a lock. But no. | |
216 ShouldNotCallThis(); | |
217 return NULL; | |
218 } | |
219 | |
220 void Generation::par_promote_alloc_undo(int thread_num, | |
221 HeapWord* obj, size_t word_sz) { | |
222 // Could do a bad general impl here that gets a lock. But no. | |
223 guarantee(false, "No good general implementation."); | |
224 } | |
225 | |
226 Space* Generation::space_containing(const void* p) const { | |
227 GenerationIsInReservedClosure blk(p); | |
228 // Cast away const | |
229 ((Generation*)this)->space_iterate(&blk); | |
230 return blk.sp; | |
231 } | |
232 | |
233 // Some of these are mediocre general implementations. Should be | |
234 // overridden to get better performance. | |
235 | |
236 class GenerationBlockStartClosure : public SpaceClosure { | |
237 public: | |
238 const void* _p; | |
239 HeapWord* _start; | |
240 virtual void do_space(Space* s) { | |
241 if (_start == NULL && s->is_in_reserved(_p)) { | |
242 _start = s->block_start(_p); | |
243 } | |
244 } | |
245 GenerationBlockStartClosure(const void* p) { _p = p; _start = NULL; } | |
246 }; | |
247 | |
248 HeapWord* Generation::block_start(const void* p) const { | |
249 GenerationBlockStartClosure blk(p); | |
250 // Cast away const | |
251 ((Generation*)this)->space_iterate(&blk); | |
252 return blk._start; | |
253 } | |
254 | |
255 class GenerationBlockSizeClosure : public SpaceClosure { | |
256 public: | |
257 const HeapWord* _p; | |
258 size_t size; | |
259 virtual void do_space(Space* s) { | |
260 if (size == 0 && s->is_in_reserved(_p)) { | |
261 size = s->block_size(_p); | |
262 } | |
263 } | |
264 GenerationBlockSizeClosure(const HeapWord* p) { _p = p; size = 0; } | |
265 }; | |
266 | |
267 size_t Generation::block_size(const HeapWord* p) const { | |
268 GenerationBlockSizeClosure blk(p); | |
269 // Cast away const | |
270 ((Generation*)this)->space_iterate(&blk); | |
271 assert(blk.size > 0, "seems reasonable"); | |
272 return blk.size; | |
273 } | |
274 | |
275 class GenerationBlockIsObjClosure : public SpaceClosure { | |
276 public: | |
277 const HeapWord* _p; | |
278 bool is_obj; | |
279 virtual void do_space(Space* s) { | |
280 if (!is_obj && s->is_in_reserved(_p)) { | |
281 is_obj |= s->block_is_obj(_p); | |
282 } | |
283 } | |
284 GenerationBlockIsObjClosure(const HeapWord* p) { _p = p; is_obj = false; } | |
285 }; | |
286 | |
287 bool Generation::block_is_obj(const HeapWord* p) const { | |
288 GenerationBlockIsObjClosure blk(p); | |
289 // Cast away const | |
290 ((Generation*)this)->space_iterate(&blk); | |
291 return blk.is_obj; | |
292 } | |
293 | |
294 class GenerationOopIterateClosure : public SpaceClosure { | |
295 public: | |
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296 ExtendedOopClosure* cl; |
0 | 297 MemRegion mr; |
298 virtual void do_space(Space* s) { | |
299 s->oop_iterate(mr, cl); | |
300 } | |
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301 GenerationOopIterateClosure(ExtendedOopClosure* _cl, MemRegion _mr) : |
0 | 302 cl(_cl), mr(_mr) {} |
303 }; | |
304 | |
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305 void Generation::oop_iterate(ExtendedOopClosure* cl) { |
0 | 306 GenerationOopIterateClosure blk(cl, _reserved); |
307 space_iterate(&blk); | |
308 } | |
309 | |
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310 void Generation::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
0 | 311 GenerationOopIterateClosure blk(cl, mr); |
312 space_iterate(&blk); | |
313 } | |
314 | |
315 void Generation::younger_refs_in_space_iterate(Space* sp, | |
316 OopsInGenClosure* cl) { | |
317 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
318 rs->younger_refs_in_space_iterate(sp, cl); | |
319 } | |
320 | |
321 class GenerationObjIterateClosure : public SpaceClosure { | |
322 private: | |
323 ObjectClosure* _cl; | |
324 public: | |
325 virtual void do_space(Space* s) { | |
326 s->object_iterate(_cl); | |
327 } | |
328 GenerationObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} | |
329 }; | |
330 | |
331 void Generation::object_iterate(ObjectClosure* cl) { | |
332 GenerationObjIterateClosure blk(cl); | |
333 space_iterate(&blk); | |
334 } | |
335 | |
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336 class GenerationSafeObjIterateClosure : public SpaceClosure { |
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337 private: |
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338 ObjectClosure* _cl; |
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339 public: |
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340 virtual void do_space(Space* s) { |
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341 s->safe_object_iterate(_cl); |
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342 } |
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343 GenerationSafeObjIterateClosure(ObjectClosure* cl) : _cl(cl) {} |
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344 }; |
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345 |
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346 void Generation::safe_object_iterate(ObjectClosure* cl) { |
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347 GenerationSafeObjIterateClosure blk(cl); |
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348 space_iterate(&blk); |
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349 } |
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350 |
0 | 351 void Generation::prepare_for_compaction(CompactPoint* cp) { |
352 // Generic implementation, can be specialized | |
353 CompactibleSpace* space = first_compaction_space(); | |
354 while (space != NULL) { | |
355 space->prepare_for_compaction(cp); | |
356 space = space->next_compaction_space(); | |
357 } | |
358 } | |
359 | |
360 class AdjustPointersClosure: public SpaceClosure { | |
361 public: | |
362 void do_space(Space* sp) { | |
363 sp->adjust_pointers(); | |
364 } | |
365 }; | |
366 | |
367 void Generation::adjust_pointers() { | |
368 // Note that this is done over all spaces, not just the compactible | |
369 // ones. | |
370 AdjustPointersClosure blk; | |
371 space_iterate(&blk, true); | |
372 } | |
373 | |
374 void Generation::compact() { | |
375 CompactibleSpace* sp = first_compaction_space(); | |
376 while (sp != NULL) { | |
377 sp->compact(); | |
378 sp = sp->next_compaction_space(); | |
379 } | |
380 } | |
381 | |
382 CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, | |
383 int level, | |
384 GenRemSet* remset) : | |
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385 Generation(rs, initial_byte_size, level), _rs(remset), |
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386 _shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(), |
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387 _used_at_prologue() |
0 | 388 { |
389 HeapWord* start = (HeapWord*)rs.base(); | |
390 size_t reserved_byte_size = rs.size(); | |
391 assert((uintptr_t(start) & 3) == 0, "bad alignment"); | |
392 assert((reserved_byte_size & 3) == 0, "bad alignment"); | |
393 MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); | |
394 _bts = new BlockOffsetSharedArray(reserved_mr, | |
395 heap_word_size(initial_byte_size)); | |
396 MemRegion committed_mr(start, heap_word_size(initial_byte_size)); | |
397 _rs->resize_covered_region(committed_mr); | |
398 if (_bts == NULL) | |
399 vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); | |
400 | |
401 // Verify that the start and end of this generation is the start of a card. | |
402 // If this wasn't true, a single card could span more than on generation, | |
403 // which would cause problems when we commit/uncommit memory, and when we | |
404 // clear and dirty cards. | |
405 guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); | |
406 if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { | |
407 // Don't check at the very end of the heap as we'll assert that we're probing off | |
408 // the end if we try. | |
409 guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); | |
410 } | |
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411 _min_heap_delta_bytes = MinHeapDeltaBytes; |
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412 _capacity_at_prologue = initial_byte_size; |
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413 _used_at_prologue = 0; |
0 | 414 } |
415 | |
271
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416 bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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417 assert_locked_or_safepoint(Heap_lock); |
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418 if (bytes == 0) { |
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419 return true; // That's what grow_by(0) would return |
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420 } |
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421 size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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422 if (aligned_bytes == 0){ |
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423 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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424 // return true with the implication that an expansion was done when it |
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425 // was not. A call to expand implies a best effort to expand by "bytes" |
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426 // but not a guarantee. Align down to give a best effort. This is likely |
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427 // the most that the generation can expand since it has some capacity to |
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428 // start with. |
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429 aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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430 } |
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431 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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432 bool success = false; |
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433 if (aligned_expand_bytes > aligned_bytes) { |
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434 success = grow_by(aligned_expand_bytes); |
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435 } |
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436 if (!success) { |
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437 success = grow_by(aligned_bytes); |
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438 } |
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439 if (!success) { |
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440 success = grow_to_reserved(); |
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441 } |
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442 if (PrintGC && Verbose) { |
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443 if (success && GC_locker::is_active_and_needs_gc()) { |
271
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444 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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445 } |
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446 } |
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447 |
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448 return success; |
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449 } |
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450 |
0 | 451 |
452 // No young generation references, clear this generation's cards. | |
453 void CardGeneration::clear_remembered_set() { | |
454 _rs->clear(reserved()); | |
455 } | |
456 | |
457 | |
458 // Objects in this generation may have moved, invalidate this | |
459 // generation's cards. | |
460 void CardGeneration::invalidate_remembered_set() { | |
461 _rs->invalidate(used_region()); | |
462 } | |
463 | |
464 | |
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465 void CardGeneration::compute_new_size() { |
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466 assert(_shrink_factor <= 100, "invalid shrink factor"); |
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467 size_t current_shrink_factor = _shrink_factor; |
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468 _shrink_factor = 0; |
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469 |
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470 // We don't have floating point command-line arguments |
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471 // Note: argument processing ensures that MinHeapFreeRatio < 100. |
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472 const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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473 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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474 |
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475 // Compute some numbers about the state of the heap. |
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476 const size_t used_after_gc = used(); |
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477 const size_t capacity_after_gc = capacity(); |
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478 |
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479 const double min_tmp = used_after_gc / maximum_used_percentage; |
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480 size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); |
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481 // Don't shrink less than the initial generation size |
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482 minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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483 spec()->init_size()); |
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484 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); |
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485 |
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486 if (PrintGC && Verbose) { |
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487 const size_t free_after_gc = free(); |
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488 const double free_percentage = ((double)free_after_gc) / capacity_after_gc; |
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489 gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); |
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490 gclog_or_tty->print_cr(" " |
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491 " minimum_free_percentage: %6.2f" |
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492 " maximum_used_percentage: %6.2f", |
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493 minimum_free_percentage, |
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494 maximum_used_percentage); |
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495 gclog_or_tty->print_cr(" " |
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496 " free_after_gc : %6.1fK" |
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497 " used_after_gc : %6.1fK" |
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498 " capacity_after_gc : %6.1fK", |
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499 free_after_gc / (double) K, |
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500 used_after_gc / (double) K, |
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501 capacity_after_gc / (double) K); |
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502 gclog_or_tty->print_cr(" " |
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503 " free_percentage: %6.2f", |
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504 free_percentage); |
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505 } |
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506 |
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507 if (capacity_after_gc < minimum_desired_capacity) { |
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508 // If we have less free space than we want then expand |
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509 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; |
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510 // Don't expand unless it's significant |
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511 if (expand_bytes >= _min_heap_delta_bytes) { |
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512 expand(expand_bytes, 0); // safe if expansion fails |
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513 } |
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514 if (PrintGC && Verbose) { |
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515 gclog_or_tty->print_cr(" expanding:" |
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516 " minimum_desired_capacity: %6.1fK" |
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517 " expand_bytes: %6.1fK" |
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518 " _min_heap_delta_bytes: %6.1fK", |
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519 minimum_desired_capacity / (double) K, |
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520 expand_bytes / (double) K, |
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521 _min_heap_delta_bytes / (double) K); |
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522 } |
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523 return; |
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524 } |
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525 |
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526 // No expansion, now see if we want to shrink |
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527 size_t shrink_bytes = 0; |
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528 // We would never want to shrink more than this |
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529 size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; |
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530 |
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531 if (MaxHeapFreeRatio < 100) { |
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532 const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
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533 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
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534 const double max_tmp = used_after_gc / minimum_used_percentage; |
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535 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
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536 maximum_desired_capacity = MAX2(maximum_desired_capacity, |
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537 spec()->init_size()); |
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538 if (PrintGC && Verbose) { |
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539 gclog_or_tty->print_cr(" " |
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540 " maximum_free_percentage: %6.2f" |
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541 " minimum_used_percentage: %6.2f", |
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542 maximum_free_percentage, |
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543 minimum_used_percentage); |
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544 gclog_or_tty->print_cr(" " |
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545 " _capacity_at_prologue: %6.1fK" |
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546 " minimum_desired_capacity: %6.1fK" |
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547 " maximum_desired_capacity: %6.1fK", |
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548 _capacity_at_prologue / (double) K, |
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549 minimum_desired_capacity / (double) K, |
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550 maximum_desired_capacity / (double) K); |
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551 } |
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552 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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553 "sanity check"); |
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554 |
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555 if (capacity_after_gc > maximum_desired_capacity) { |
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556 // Capacity too large, compute shrinking size |
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557 shrink_bytes = capacity_after_gc - maximum_desired_capacity; |
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558 // We don't want shrink all the way back to initSize if people call |
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559 // System.gc(), because some programs do that between "phases" and then |
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560 // we'd just have to grow the heap up again for the next phase. So we |
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561 // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
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562 // on the third call, and 100% by the fourth call. But if we recompute |
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563 // size without shrinking, it goes back to 0%. |
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564 shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
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565 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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566 if (current_shrink_factor == 0) { |
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567 _shrink_factor = 10; |
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568 } else { |
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569 _shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); |
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570 } |
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571 if (PrintGC && Verbose) { |
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572 gclog_or_tty->print_cr(" " |
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573 " shrinking:" |
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574 " initSize: %.1fK" |
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575 " maximum_desired_capacity: %.1fK", |
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576 spec()->init_size() / (double) K, |
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577 maximum_desired_capacity / (double) K); |
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578 gclog_or_tty->print_cr(" " |
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579 " shrink_bytes: %.1fK" |
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580 " current_shrink_factor: %d" |
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581 " new shrink factor: %d" |
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582 " _min_heap_delta_bytes: %.1fK", |
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583 shrink_bytes / (double) K, |
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584 current_shrink_factor, |
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585 _shrink_factor, |
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586 _min_heap_delta_bytes / (double) K); |
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587 } |
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588 } |
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589 } |
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590 |
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591 if (capacity_after_gc > _capacity_at_prologue) { |
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592 // We might have expanded for promotions, in which case we might want to |
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593 // take back that expansion if there's room after GC. That keeps us from |
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594 // stretching the heap with promotions when there's plenty of room. |
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595 size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; |
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596 expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); |
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597 // We have two shrinking computations, take the largest |
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598 shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); |
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599 assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
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600 if (PrintGC && Verbose) { |
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601 gclog_or_tty->print_cr(" " |
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602 " aggressive shrinking:" |
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603 " _capacity_at_prologue: %.1fK" |
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604 " capacity_after_gc: %.1fK" |
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605 " expansion_for_promotion: %.1fK" |
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606 " shrink_bytes: %.1fK", |
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607 capacity_after_gc / (double) K, |
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608 _capacity_at_prologue / (double) K, |
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609 expansion_for_promotion / (double) K, |
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610 shrink_bytes / (double) K); |
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611 } |
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612 } |
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613 // Don't shrink unless it's significant |
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614 if (shrink_bytes >= _min_heap_delta_bytes) { |
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615 shrink(shrink_bytes); |
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616 } |
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617 } |
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618 |
0 | 619 // Currently nothing to do. |
620 void CardGeneration::prepare_for_verify() {} | |
621 | |
622 | |
623 void OneContigSpaceCardGeneration::collect(bool full, | |
624 bool clear_all_soft_refs, | |
625 size_t size, | |
626 bool is_tlab) { | |
627 SpecializationStats::clear(); | |
628 // Temporarily expand the span of our ref processor, so | |
629 // refs discovery is over the entire heap, not just this generation | |
630 ReferenceProcessorSpanMutator | |
631 x(ref_processor(), GenCollectedHeap::heap()->reserved_region()); | |
632 GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs); | |
633 SpecializationStats::print(); | |
634 } | |
635 | |
636 HeapWord* | |
637 OneContigSpaceCardGeneration::expand_and_allocate(size_t word_size, | |
638 bool is_tlab, | |
639 bool parallel) { | |
640 assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation"); | |
641 if (parallel) { | |
642 MutexLocker x(ParGCRareEvent_lock); | |
643 HeapWord* result = NULL; | |
644 size_t byte_size = word_size * HeapWordSize; | |
645 while (true) { | |
646 expand(byte_size, _min_heap_delta_bytes); | |
647 if (GCExpandToAllocateDelayMillis > 0) { | |
648 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
649 } | |
650 result = _the_space->par_allocate(word_size); | |
651 if ( result != NULL) { | |
652 return result; | |
653 } else { | |
654 // If there's not enough expansion space available, give up. | |
655 if (_virtual_space.uncommitted_size() < byte_size) { | |
656 return NULL; | |
657 } | |
658 // else try again | |
659 } | |
660 } | |
661 } else { | |
662 expand(word_size*HeapWordSize, _min_heap_delta_bytes); | |
663 return _the_space->allocate(word_size); | |
664 } | |
665 } | |
666 | |
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667 bool OneContigSpaceCardGeneration::expand(size_t bytes, size_t expand_bytes) { |
0 | 668 GCMutexLocker x(ExpandHeap_lock); |
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669 return CardGeneration::expand(bytes, expand_bytes); |
0 | 670 } |
671 | |
672 | |
673 void OneContigSpaceCardGeneration::shrink(size_t bytes) { | |
674 assert_locked_or_safepoint(ExpandHeap_lock); | |
675 size_t size = ReservedSpace::page_align_size_down(bytes); | |
676 if (size > 0) { | |
677 shrink_by(size); | |
678 } | |
679 } | |
680 | |
681 | |
682 size_t OneContigSpaceCardGeneration::capacity() const { | |
683 return _the_space->capacity(); | |
684 } | |
685 | |
686 | |
687 size_t OneContigSpaceCardGeneration::used() const { | |
688 return _the_space->used(); | |
689 } | |
690 | |
691 | |
692 size_t OneContigSpaceCardGeneration::free() const { | |
693 return _the_space->free(); | |
694 } | |
695 | |
696 MemRegion OneContigSpaceCardGeneration::used_region() const { | |
697 return the_space()->used_region(); | |
698 } | |
699 | |
700 size_t OneContigSpaceCardGeneration::unsafe_max_alloc_nogc() const { | |
701 return _the_space->free(); | |
702 } | |
703 | |
704 size_t OneContigSpaceCardGeneration::contiguous_available() const { | |
705 return _the_space->free() + _virtual_space.uncommitted_size(); | |
706 } | |
707 | |
708 bool OneContigSpaceCardGeneration::grow_by(size_t bytes) { | |
709 assert_locked_or_safepoint(ExpandHeap_lock); | |
710 bool result = _virtual_space.expand_by(bytes); | |
711 if (result) { | |
712 size_t new_word_size = | |
713 heap_word_size(_virtual_space.committed_size()); | |
714 MemRegion mr(_the_space->bottom(), new_word_size); | |
715 // Expand card table | |
716 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
717 // Expand shared block offset array | |
718 _bts->resize(new_word_size); | |
719 | |
720 // Fix for bug #4668531 | |
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721 if (ZapUnusedHeapArea) { |
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722 MemRegion mangle_region(_the_space->end(), |
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723 (HeapWord*)_virtual_space.high()); |
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724 SpaceMangler::mangle_region(mangle_region); |
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725 } |
0 | 726 |
727 // Expand space -- also expands space's BOT | |
728 // (which uses (part of) shared array above) | |
729 _the_space->set_end((HeapWord*)_virtual_space.high()); | |
730 | |
731 // update the space and generation capacity counters | |
732 update_counters(); | |
733 | |
734 if (Verbose && PrintGC) { | |
735 size_t new_mem_size = _virtual_space.committed_size(); | |
736 size_t old_mem_size = new_mem_size - bytes; | |
737 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
738 SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
739 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
740 } | |
741 } | |
742 return result; | |
743 } | |
744 | |
745 | |
746 bool OneContigSpaceCardGeneration::grow_to_reserved() { | |
747 assert_locked_or_safepoint(ExpandHeap_lock); | |
748 bool success = true; | |
749 const size_t remaining_bytes = _virtual_space.uncommitted_size(); | |
750 if (remaining_bytes > 0) { | |
751 success = grow_by(remaining_bytes); | |
752 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) | |
753 } | |
754 return success; | |
755 } | |
756 | |
757 void OneContigSpaceCardGeneration::shrink_by(size_t bytes) { | |
758 assert_locked_or_safepoint(ExpandHeap_lock); | |
759 // Shrink committed space | |
760 _virtual_space.shrink_by(bytes); | |
761 // Shrink space; this also shrinks the space's BOT | |
762 _the_space->set_end((HeapWord*) _virtual_space.high()); | |
763 size_t new_word_size = heap_word_size(_the_space->capacity()); | |
764 // Shrink the shared block offset array | |
765 _bts->resize(new_word_size); | |
766 MemRegion mr(_the_space->bottom(), new_word_size); | |
767 // Shrink the card table | |
768 Universe::heap()->barrier_set()->resize_covered_region(mr); | |
769 | |
770 if (Verbose && PrintGC) { | |
771 size_t new_mem_size = _virtual_space.committed_size(); | |
772 size_t old_mem_size = new_mem_size + bytes; | |
773 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", | |
774 name(), old_mem_size/K, new_mem_size/K); | |
775 } | |
776 } | |
777 | |
778 // Currently nothing to do. | |
779 void OneContigSpaceCardGeneration::prepare_for_verify() {} | |
780 | |
781 | |
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782 // Override for a card-table generation with one contiguous |
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783 // space. NOTE: For reasons that are lost in the fog of history, |
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784 // this code is used when you iterate over perm gen objects, |
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785 // even when one uses CDS, where the perm gen has a couple of |
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786 // other spaces; this is because CompactingPermGenGen derives |
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787 // from OneContigSpaceCardGeneration. This should be cleaned up, |
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788 // see CR 6897789.. |
0 | 789 void OneContigSpaceCardGeneration::object_iterate(ObjectClosure* blk) { |
790 _the_space->object_iterate(blk); | |
791 } | |
792 | |
793 void OneContigSpaceCardGeneration::space_iterate(SpaceClosure* blk, | |
794 bool usedOnly) { | |
795 blk->do_space(_the_space); | |
796 } | |
797 | |
798 void OneContigSpaceCardGeneration::object_iterate_since_last_GC(ObjectClosure* blk) { | |
799 // Deal with delayed initialization of _the_space, | |
800 // and lack of initialization of _last_gc. | |
801 if (_last_gc.space() == NULL) { | |
802 assert(the_space() != NULL, "shouldn't be NULL"); | |
803 _last_gc = the_space()->bottom_mark(); | |
804 } | |
805 the_space()->object_iterate_from(_last_gc, blk); | |
806 } | |
807 | |
808 void OneContigSpaceCardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { | |
809 blk->set_generation(this); | |
810 younger_refs_in_space_iterate(_the_space, blk); | |
811 blk->reset_generation(); | |
812 } | |
813 | |
814 void OneContigSpaceCardGeneration::save_marks() { | |
815 _the_space->set_saved_mark(); | |
816 } | |
817 | |
818 | |
819 void OneContigSpaceCardGeneration::reset_saved_marks() { | |
820 _the_space->reset_saved_mark(); | |
821 } | |
822 | |
823 | |
824 bool OneContigSpaceCardGeneration::no_allocs_since_save_marks() { | |
825 return _the_space->saved_mark_at_top(); | |
826 } | |
827 | |
828 #define OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
829 \ | |
830 void OneContigSpaceCardGeneration:: \ | |
831 oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \ | |
832 blk->set_generation(this); \ | |
833 _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \ | |
834 blk->reset_generation(); \ | |
835 save_marks(); \ | |
836 } | |
837 | |
838 ALL_SINCE_SAVE_MARKS_CLOSURES(OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
839 | |
840 #undef OneContig_SINCE_SAVE_MARKS_ITERATE_DEFN | |
841 | |
842 | |
843 void OneContigSpaceCardGeneration::gc_epilogue(bool full) { | |
844 _last_gc = WaterMark(the_space(), the_space()->top()); | |
845 | |
846 // update the generation and space performance counters | |
847 update_counters(); | |
263
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848 if (ZapUnusedHeapArea) { |
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849 the_space()->check_mangled_unused_area_complete(); |
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850 } |
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851 } |
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852 |
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853 void OneContigSpaceCardGeneration::record_spaces_top() { |
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854 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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855 the_space()->set_top_for_allocations(); |
0 | 856 } |
857 | |
6008 | 858 void OneContigSpaceCardGeneration::verify() { |
859 the_space()->verify(); | |
0 | 860 } |
861 | |
862 void OneContigSpaceCardGeneration::print_on(outputStream* st) const { | |
863 Generation::print_on(st); | |
864 st->print(" the"); | |
865 the_space()->print_on(st); | |
866 } |