Mercurial > hg > truffle
annotate src/share/vm/memory/tenuredGeneration.cpp @ 21244:bf5e055dbc9c
SSAUtils: minor refactoring.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 30 Apr 2015 15:36:03 +0200 |
parents | 89152779163c |
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rev | line source |
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0 | 1 /* |
17524 | 2 * Copyright (c) 2001, 2013, 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, | |
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42 level, remset, NULL) |
0 | 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::gc_prologue(bool full) { | |
90 _capacity_at_prologue = capacity(); | |
91 _used_at_prologue = used(); | |
92 if (VerifyBeforeGC) { | |
93 verify_alloc_buffers_clean(); | |
94 } | |
95 } | |
96 | |
97 void TenuredGeneration::gc_epilogue(bool full) { | |
98 if (VerifyAfterGC) { | |
99 verify_alloc_buffers_clean(); | |
100 } | |
101 OneContigSpaceCardGeneration::gc_epilogue(full); | |
102 } | |
103 | |
104 | |
105 bool TenuredGeneration::should_collect(bool full, | |
106 size_t size, | |
107 bool is_tlab) { | |
108 // This should be one big conditional or (||), but I want to be able to tell | |
109 // why it returns what it returns (without re-evaluating the conditionals | |
110 // in case they aren't idempotent), so I'm doing it this way. | |
111 // DeMorgan says it's okay. | |
112 bool result = false; | |
113 if (!result && full) { | |
114 result = true; | |
115 if (PrintGC && Verbose) { | |
116 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
117 " full"); | |
118 } | |
119 } | |
120 if (!result && should_allocate(size, is_tlab)) { | |
121 result = true; | |
122 if (PrintGC && Verbose) { | |
123 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
124 " should_allocate(" SIZE_FORMAT ")", | |
125 size); | |
126 } | |
127 } | |
128 // If we don't have very much free space. | |
129 // XXX: 10000 should be a percentage of the capacity!!! | |
130 if (!result && free() < 10000) { | |
131 result = true; | |
132 if (PrintGC && Verbose) { | |
133 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
134 " free(): " SIZE_FORMAT, | |
135 free()); | |
136 } | |
137 } | |
14909 | 138 // If we had to expand to accomodate promotions from younger generations |
0 | 139 if (!result && _capacity_at_prologue < capacity()) { |
140 result = true; | |
141 if (PrintGC && Verbose) { | |
142 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
143 "_capacity_at_prologue: " SIZE_FORMAT " < capacity(): " SIZE_FORMAT, | |
144 _capacity_at_prologue, capacity()); | |
145 } | |
146 } | |
147 return result; | |
148 } | |
149 | |
150 void TenuredGeneration::collect(bool full, | |
151 bool clear_all_soft_refs, | |
152 size_t size, | |
153 bool is_tlab) { | |
154 retire_alloc_buffers_before_full_gc(); | |
155 OneContigSpaceCardGeneration::collect(full, clear_all_soft_refs, | |
156 size, is_tlab); | |
157 } | |
158 | |
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159 void TenuredGeneration::compute_new_size() { |
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160 assert_locked_or_safepoint(Heap_lock); |
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161 |
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162 // Compute some numbers about the state of the heap. |
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163 const size_t used_after_gc = used(); |
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164 const size_t capacity_after_gc = capacity(); |
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165 |
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166 CardGeneration::compute_new_size(); |
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167 |
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168 assert(used() == used_after_gc && used_after_gc <= capacity(), |
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169 err_msg("used: " SIZE_FORMAT " used_after_gc: " SIZE_FORMAT |
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170 " capacity: " SIZE_FORMAT, used(), used_after_gc, capacity())); |
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171 } |
0 | 172 void TenuredGeneration::update_gc_stats(int current_level, |
173 bool full) { | |
174 // If the next lower level(s) has been collected, gather any statistics | |
175 // that are of interest at this point. | |
176 if (!full && (current_level + 1) == level()) { | |
177 // Calculate size of data promoted from the younger generations | |
178 // before doing the collection. | |
179 size_t used_before_gc = used(); | |
180 | |
181 // If the younger gen collections were skipped, then the | |
182 // number of promoted bytes will be 0 and adding it to the | |
183 // average will incorrectly lessen the average. It is, however, | |
184 // also possible that no promotion was needed. | |
185 if (used_before_gc >= _used_at_prologue) { | |
186 size_t promoted_in_bytes = used_before_gc - _used_at_prologue; | |
187 gc_stats()->avg_promoted()->sample(promoted_in_bytes); | |
188 } | |
189 } | |
190 } | |
191 | |
192 void TenuredGeneration::update_counters() { | |
193 if (UsePerfData) { | |
194 _space_counters->update_all(); | |
195 _gen_counters->update_all(); | |
196 } | |
197 } | |
198 | |
199 | |
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200 #if INCLUDE_ALL_GCS |
0 | 201 oop TenuredGeneration::par_promote(int thread_num, |
202 oop old, markOop m, size_t word_sz) { | |
203 | |
204 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
205 HeapWord* obj_ptr = buf->allocate(word_sz); | |
206 bool is_lab = true; | |
207 if (obj_ptr == NULL) { | |
208 #ifndef PRODUCT | |
209 if (Universe::heap()->promotion_should_fail()) { | |
210 return NULL; | |
211 } | |
212 #endif // #ifndef PRODUCT | |
213 | |
214 // Slow path: | |
215 if (word_sz * 100 < ParallelGCBufferWastePct * buf->word_sz()) { | |
216 // Is small enough; abandon this buffer and start a new one. | |
217 size_t buf_size = buf->word_sz(); | |
218 HeapWord* buf_space = | |
219 TenuredGeneration::par_allocate(buf_size, false); | |
220 if (buf_space == NULL) { | |
221 buf_space = expand_and_allocate(buf_size, false, true /* parallel*/); | |
222 } | |
223 if (buf_space != NULL) { | |
224 buf->retire(false, false); | |
225 buf->set_buf(buf_space); | |
226 obj_ptr = buf->allocate(word_sz); | |
227 assert(obj_ptr != NULL, "Buffer was definitely big enough..."); | |
228 } | |
229 }; | |
230 // Otherwise, buffer allocation failed; try allocating object | |
231 // individually. | |
232 if (obj_ptr == NULL) { | |
233 obj_ptr = TenuredGeneration::par_allocate(word_sz, false); | |
234 if (obj_ptr == NULL) { | |
235 obj_ptr = expand_and_allocate(word_sz, false, true /* parallel */); | |
236 } | |
237 } | |
238 if (obj_ptr == NULL) return NULL; | |
239 } | |
240 assert(obj_ptr != NULL, "program logic"); | |
241 Copy::aligned_disjoint_words((HeapWord*)old, obj_ptr, word_sz); | |
242 oop obj = oop(obj_ptr); | |
243 // Restore the mark word copied above. | |
244 obj->set_mark(m); | |
245 return obj; | |
246 } | |
247 | |
248 void TenuredGeneration::par_promote_alloc_undo(int thread_num, | |
249 HeapWord* obj, | |
250 size_t word_sz) { | |
251 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
252 if (buf->contains(obj)) { | |
253 guarantee(buf->contains(obj + word_sz - 1), | |
254 "should contain whole object"); | |
255 buf->undo_allocation(obj, word_sz); | |
256 } else { | |
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257 CollectedHeap::fill_with_object(obj, word_sz); |
0 | 258 } |
259 } | |
260 | |
261 void TenuredGeneration::par_promote_alloc_done(int thread_num) { | |
262 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
263 buf->retire(true, ParallelGCRetainPLAB); | |
264 } | |
265 | |
266 void TenuredGeneration::retire_alloc_buffers_before_full_gc() { | |
267 if (UseParNewGC) { | |
268 for (uint i = 0; i < ParallelGCThreads; i++) { | |
269 _alloc_buffers[i]->retire(true /*end_of_gc*/, false /*retain*/); | |
270 } | |
271 } | |
272 } | |
273 | |
274 // Verify that any retained parallel allocation buffers do not | |
275 // intersect with dirty cards. | |
276 void TenuredGeneration::verify_alloc_buffers_clean() { | |
277 if (UseParNewGC) { | |
278 for (uint i = 0; i < ParallelGCThreads; i++) { | |
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279 _rs->verify_aligned_region_empty(_alloc_buffers[i]->range()); |
0 | 280 } |
281 } | |
282 } | |
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283 |
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284 #else // INCLUDE_ALL_GCS |
0 | 285 void TenuredGeneration::retire_alloc_buffers_before_full_gc() {} |
286 void TenuredGeneration::verify_alloc_buffers_clean() {} | |
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287 #endif // INCLUDE_ALL_GCS |
0 | 288 |
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289 bool TenuredGeneration::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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290 size_t available = max_contiguous_available(); |
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291 size_t av_promo = (size_t)gc_stats()->avg_promoted()->padded_average(); |
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292 bool res = (available >= av_promo) || (available >= max_promotion_in_bytes); |
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293 if (PrintGC && Verbose) { |
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294 gclog_or_tty->print_cr( |
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295 "Tenured: promo attempt is%s safe: available("SIZE_FORMAT") %s av_promo("SIZE_FORMAT")," |
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296 "max_promo("SIZE_FORMAT")", |
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297 res? "":" not", available, res? ">=":"<", |
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298 av_promo, max_promotion_in_bytes); |
0 | 299 } |
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300 return res; |
0 | 301 } |