Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/tenuredGeneration.cpp @ 23822:626f594dffa6
8139040: Fix initializations before ShouldNotReachHere() etc. and enable -Wuninitialized on linux.
Reviewed-by: stuefe, coleenp, roland
| author | csahu |
|---|---|
| date | Tue, 01 Mar 2016 12:50:37 +0530 |
| parents | 1830156c6b7e |
| children | dd9cc155639c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 22827 | 2 * Copyright (c) 2001, 2015, 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" | |
| 27 #include "memory/allocation.inline.hpp" | |
| 28 #include "memory/blockOffsetTable.inline.hpp" | |
| 29 #include "memory/generation.inline.hpp" | |
| 30 #include "memory/generationSpec.hpp" | |
| 31 #include "memory/space.hpp" | |
| 32 #include "memory/tenuredGeneration.hpp" | |
| 33 #include "oops/oop.inline.hpp" | |
| 34 #include "runtime/java.hpp" | |
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35 #include "utilities/macros.hpp" |
| 22827 | 36 #if INCLUDE_ALL_GCS |
| 37 #include "gc_implementation/shared/parGCAllocBuffer.hpp" | |
| 38 #endif | |
| 0 | 39 |
| 40 TenuredGeneration::TenuredGeneration(ReservedSpace rs, | |
| 41 size_t initial_byte_size, int level, | |
| 42 GenRemSet* remset) : | |
| 43 OneContigSpaceCardGeneration(rs, initial_byte_size, | |
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44 level, remset, NULL) |
| 0 | 45 { |
| 46 HeapWord* bottom = (HeapWord*) _virtual_space.low(); | |
| 47 HeapWord* end = (HeapWord*) _virtual_space.high(); | |
| 48 _the_space = new TenuredSpace(_bts, MemRegion(bottom, end)); | |
| 49 _the_space->reset_saved_mark(); | |
| 50 _shrink_factor = 0; | |
| 51 _capacity_at_prologue = 0; | |
| 52 | |
| 53 _gc_stats = new GCStats(); | |
| 54 | |
| 55 // initialize performance counters | |
| 56 | |
| 57 const char* gen_name = "old"; | |
| 58 | |
| 59 // Generation Counters -- generation 1, 1 subspace | |
| 60 _gen_counters = new GenerationCounters(gen_name, 1, 1, &_virtual_space); | |
| 61 | |
| 62 _gc_counters = new CollectorCounters("MSC", 1); | |
| 63 | |
| 64 _space_counters = new CSpaceCounters(gen_name, 0, | |
| 65 _virtual_space.reserved_size(), | |
| 66 _the_space, _gen_counters); | |
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67 #if INCLUDE_ALL_GCS |
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68 if (UseParNewGC) { |
| 0 | 69 typedef ParGCAllocBufferWithBOT* ParGCAllocBufferWithBOTPtr; |
| 70 _alloc_buffers = NEW_C_HEAP_ARRAY(ParGCAllocBufferWithBOTPtr, | |
| 6197 | 71 ParallelGCThreads, mtGC); |
| 0 | 72 if (_alloc_buffers == NULL) |
| 73 vm_exit_during_initialization("Could not allocate alloc_buffers"); | |
| 74 for (uint i = 0; i < ParallelGCThreads; i++) { | |
| 75 _alloc_buffers[i] = | |
| 76 new ParGCAllocBufferWithBOT(OldPLABSize, _bts); | |
| 77 if (_alloc_buffers[i] == NULL) | |
| 78 vm_exit_during_initialization("Could not allocate alloc_buffers"); | |
| 79 } | |
| 80 } else { | |
| 81 _alloc_buffers = NULL; | |
| 82 } | |
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83 #endif // INCLUDE_ALL_GCS |
| 0 | 84 } |
| 85 | |
| 86 | |
| 87 const char* TenuredGeneration::name() const { | |
| 88 return "tenured generation"; | |
| 89 } | |
| 90 | |
| 91 void TenuredGeneration::gc_prologue(bool full) { | |
| 92 _capacity_at_prologue = capacity(); | |
| 93 _used_at_prologue = used(); | |
| 94 if (VerifyBeforeGC) { | |
| 95 verify_alloc_buffers_clean(); | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 void TenuredGeneration::gc_epilogue(bool full) { | |
| 100 if (VerifyAfterGC) { | |
| 101 verify_alloc_buffers_clean(); | |
| 102 } | |
| 103 OneContigSpaceCardGeneration::gc_epilogue(full); | |
| 104 } | |
| 105 | |
| 106 | |
| 107 bool TenuredGeneration::should_collect(bool full, | |
| 108 size_t size, | |
| 109 bool is_tlab) { | |
| 110 // This should be one big conditional or (||), but I want to be able to tell | |
| 111 // why it returns what it returns (without re-evaluating the conditionals | |
| 112 // in case they aren't idempotent), so I'm doing it this way. | |
| 113 // DeMorgan says it's okay. | |
| 114 bool result = false; | |
| 115 if (!result && full) { | |
| 116 result = true; | |
| 117 if (PrintGC && Verbose) { | |
| 118 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
| 119 " full"); | |
| 120 } | |
| 121 } | |
| 122 if (!result && should_allocate(size, is_tlab)) { | |
| 123 result = true; | |
| 124 if (PrintGC && Verbose) { | |
| 125 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
| 126 " should_allocate(" SIZE_FORMAT ")", | |
| 127 size); | |
| 128 } | |
| 129 } | |
| 130 // If we don't have very much free space. | |
| 131 // XXX: 10000 should be a percentage of the capacity!!! | |
| 132 if (!result && free() < 10000) { | |
| 133 result = true; | |
| 134 if (PrintGC && Verbose) { | |
| 135 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
| 136 " free(): " SIZE_FORMAT, | |
| 137 free()); | |
| 138 } | |
| 139 } | |
| 140 // If we had to expand to accomodate promotions from younger generations | |
| 141 if (!result && _capacity_at_prologue < capacity()) { | |
| 142 result = true; | |
| 143 if (PrintGC && Verbose) { | |
| 144 gclog_or_tty->print_cr("TenuredGeneration::should_collect: because" | |
| 145 "_capacity_at_prologue: " SIZE_FORMAT " < capacity(): " SIZE_FORMAT, | |
| 146 _capacity_at_prologue, capacity()); | |
| 147 } | |
| 148 } | |
| 149 return result; | |
| 150 } | |
| 151 | |
| 152 void TenuredGeneration::collect(bool full, | |
| 153 bool clear_all_soft_refs, | |
| 154 size_t size, | |
| 155 bool is_tlab) { | |
| 156 retire_alloc_buffers_before_full_gc(); | |
| 157 OneContigSpaceCardGeneration::collect(full, clear_all_soft_refs, | |
| 158 size, is_tlab); | |
| 159 } | |
| 160 | |
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161 void TenuredGeneration::compute_new_size() { |
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162 assert_locked_or_safepoint(Heap_lock); |
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163 |
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164 // Compute some numbers about the state of the heap. |
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165 const size_t used_after_gc = used(); |
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166 const size_t capacity_after_gc = capacity(); |
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167 |
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168 CardGeneration::compute_new_size(); |
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169 |
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170 assert(used() == used_after_gc && used_after_gc <= capacity(), |
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171 err_msg("used: " SIZE_FORMAT " used_after_gc: " SIZE_FORMAT |
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172 " capacity: " SIZE_FORMAT, used(), used_after_gc, capacity())); |
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173 } |
| 0 | 174 void TenuredGeneration::update_gc_stats(int current_level, |
| 175 bool full) { | |
| 176 // If the next lower level(s) has been collected, gather any statistics | |
| 177 // that are of interest at this point. | |
| 178 if (!full && (current_level + 1) == level()) { | |
| 179 // Calculate size of data promoted from the younger generations | |
| 180 // before doing the collection. | |
| 181 size_t used_before_gc = used(); | |
| 182 | |
| 183 // If the younger gen collections were skipped, then the | |
| 184 // number of promoted bytes will be 0 and adding it to the | |
| 185 // average will incorrectly lessen the average. It is, however, | |
| 186 // also possible that no promotion was needed. | |
| 187 if (used_before_gc >= _used_at_prologue) { | |
| 188 size_t promoted_in_bytes = used_before_gc - _used_at_prologue; | |
| 189 gc_stats()->avg_promoted()->sample(promoted_in_bytes); | |
| 190 } | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 void TenuredGeneration::update_counters() { | |
| 195 if (UsePerfData) { | |
| 196 _space_counters->update_all(); | |
| 197 _gen_counters->update_all(); | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 | |
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202 #if INCLUDE_ALL_GCS |
| 0 | 203 oop TenuredGeneration::par_promote(int thread_num, |
| 204 oop old, markOop m, size_t word_sz) { | |
| 205 | |
| 206 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
| 207 HeapWord* obj_ptr = buf->allocate(word_sz); | |
| 208 bool is_lab = true; | |
| 209 if (obj_ptr == NULL) { | |
| 210 #ifndef PRODUCT | |
| 211 if (Universe::heap()->promotion_should_fail()) { | |
| 212 return NULL; | |
| 213 } | |
| 214 #endif // #ifndef PRODUCT | |
| 215 | |
| 216 // Slow path: | |
| 217 if (word_sz * 100 < ParallelGCBufferWastePct * buf->word_sz()) { | |
| 218 // Is small enough; abandon this buffer and start a new one. | |
| 219 size_t buf_size = buf->word_sz(); | |
| 220 HeapWord* buf_space = | |
| 221 TenuredGeneration::par_allocate(buf_size, false); | |
| 222 if (buf_space == NULL) { | |
| 223 buf_space = expand_and_allocate(buf_size, false, true /* parallel*/); | |
| 224 } | |
| 225 if (buf_space != NULL) { | |
| 226 buf->retire(false, false); | |
| 227 buf->set_buf(buf_space); | |
| 228 obj_ptr = buf->allocate(word_sz); | |
| 229 assert(obj_ptr != NULL, "Buffer was definitely big enough..."); | |
| 230 } | |
| 231 }; | |
| 232 // Otherwise, buffer allocation failed; try allocating object | |
| 233 // individually. | |
| 234 if (obj_ptr == NULL) { | |
| 235 obj_ptr = TenuredGeneration::par_allocate(word_sz, false); | |
| 236 if (obj_ptr == NULL) { | |
| 237 obj_ptr = expand_and_allocate(word_sz, false, true /* parallel */); | |
| 238 } | |
| 239 } | |
| 240 if (obj_ptr == NULL) return NULL; | |
| 241 } | |
| 242 assert(obj_ptr != NULL, "program logic"); | |
| 243 Copy::aligned_disjoint_words((HeapWord*)old, obj_ptr, word_sz); | |
| 244 oop obj = oop(obj_ptr); | |
| 245 // Restore the mark word copied above. | |
| 246 obj->set_mark(m); | |
| 247 return obj; | |
| 248 } | |
| 249 | |
| 250 void TenuredGeneration::par_promote_alloc_undo(int thread_num, | |
| 251 HeapWord* obj, | |
| 252 size_t word_sz) { | |
| 253 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
| 254 if (buf->contains(obj)) { | |
| 255 guarantee(buf->contains(obj + word_sz - 1), | |
| 256 "should contain whole object"); | |
| 257 buf->undo_allocation(obj, word_sz); | |
| 258 } else { | |
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259 CollectedHeap::fill_with_object(obj, word_sz); |
| 0 | 260 } |
| 261 } | |
| 262 | |
| 263 void TenuredGeneration::par_promote_alloc_done(int thread_num) { | |
| 264 ParGCAllocBufferWithBOT* buf = _alloc_buffers[thread_num]; | |
| 265 buf->retire(true, ParallelGCRetainPLAB); | |
| 266 } | |
| 267 | |
| 268 void TenuredGeneration::retire_alloc_buffers_before_full_gc() { | |
| 269 if (UseParNewGC) { | |
| 270 for (uint i = 0; i < ParallelGCThreads; i++) { | |
| 271 _alloc_buffers[i]->retire(true /*end_of_gc*/, false /*retain*/); | |
| 272 } | |
| 273 } | |
| 274 } | |
| 275 | |
| 276 // Verify that any retained parallel allocation buffers do not | |
| 277 // intersect with dirty cards. | |
| 278 void TenuredGeneration::verify_alloc_buffers_clean() { | |
| 279 if (UseParNewGC) { | |
| 280 for (uint i = 0; i < ParallelGCThreads; i++) { | |
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281 _rs->verify_aligned_region_empty(_alloc_buffers[i]->range()); |
| 0 | 282 } |
| 283 } | |
| 284 } | |
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285 |
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286 #else // INCLUDE_ALL_GCS |
| 0 | 287 void TenuredGeneration::retire_alloc_buffers_before_full_gc() {} |
| 288 void TenuredGeneration::verify_alloc_buffers_clean() {} | |
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289 #endif // INCLUDE_ALL_GCS |
| 0 | 290 |
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291 bool TenuredGeneration::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const { |
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292 size_t available = max_contiguous_available(); |
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293 size_t av_promo = (size_t)gc_stats()->avg_promoted()->padded_average(); |
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294 bool res = (available >= av_promo) || (available >= max_promotion_in_bytes); |
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295 if (PrintGC && Verbose) { |
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296 gclog_or_tty->print_cr( |
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297 "Tenured: promo attempt is%s safe: available("SIZE_FORMAT") %s av_promo("SIZE_FORMAT")," |
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298 "max_promo("SIZE_FORMAT")", |
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299 res? "":" not", available, res? ">=":"<", |
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300 av_promo, max_promotion_in_bytes); |
| 0 | 301 } |
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302 return res; |
| 0 | 303 } |