Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | 183f41cf8bfe |
| children | 1ee8caae33af |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_collectorPolicy.cpp.incl" | |
| 27 | |
| 28 // CollectorPolicy methods. | |
| 29 | |
| 30 void CollectorPolicy::initialize_flags() { | |
| 31 if (PermSize > MaxPermSize) { | |
| 32 MaxPermSize = PermSize; | |
| 33 } | |
| 34 PermSize = align_size_down(PermSize, min_alignment()); | |
| 35 MaxPermSize = align_size_up(MaxPermSize, max_alignment()); | |
| 36 | |
| 37 MinPermHeapExpansion = align_size_down(MinPermHeapExpansion, min_alignment()); | |
| 38 MaxPermHeapExpansion = align_size_down(MaxPermHeapExpansion, min_alignment()); | |
| 39 | |
| 40 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
| 41 | |
| 42 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment()); | |
| 43 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment()); | |
| 44 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment()); | |
| 45 | |
| 46 assert(PermSize % min_alignment() == 0, "permanent space alignment"); | |
| 47 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment"); | |
| 48 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment"); | |
| 49 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment"); | |
| 50 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment"); | |
| 51 if (PermSize < M) { | |
| 52 vm_exit_during_initialization("Too small initial permanent heap"); | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 void CollectorPolicy::initialize_size_info() { | |
| 57 // User inputs from -mx and ms are aligned | |
| 58 _initial_heap_byte_size = align_size_up(Arguments::initial_heap_size(), | |
| 59 min_alignment()); | |
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60 set_min_heap_byte_size(align_size_up(Arguments::min_heap_size(), |
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61 min_alignment())); |
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62 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
| 0 | 63 |
| 64 // Check validity of heap parameters from launcher | |
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65 if (initial_heap_byte_size() == 0) { |
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66 set_initial_heap_byte_size(NewSize + OldSize); |
| 0 | 67 } else { |
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68 Universe::check_alignment(initial_heap_byte_size(), min_alignment(), |
| 0 | 69 "initial heap"); |
| 70 } | |
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71 if (min_heap_byte_size() == 0) { |
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72 set_min_heap_byte_size(NewSize + OldSize); |
| 0 | 73 } else { |
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74 Universe::check_alignment(min_heap_byte_size(), min_alignment(), |
| 0 | 75 "initial heap"); |
| 76 } | |
| 77 | |
| 78 // Check heap parameter properties | |
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79 if (initial_heap_byte_size() < M) { |
| 0 | 80 vm_exit_during_initialization("Too small initial heap"); |
| 81 } | |
| 82 // Check heap parameter properties | |
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83 if (min_heap_byte_size() < M) { |
| 0 | 84 vm_exit_during_initialization("Too small minimum heap"); |
| 85 } | |
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86 if (initial_heap_byte_size() <= NewSize) { |
| 0 | 87 // make sure there is at least some room in old space |
| 88 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
| 89 } | |
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90 if (max_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 91 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
| 92 } | |
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93 if (initial_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 94 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
| 95 } | |
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96 if (max_heap_byte_size() < initial_heap_byte_size()) { |
| 0 | 97 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
| 98 } | |
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99 |
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100 if (PrintGCDetails && Verbose) { |
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101 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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102 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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103 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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104 } |
| 0 | 105 } |
| 106 | |
| 107 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
| 108 _permanent_generation = | |
| 109 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
| 110 SharedReadOnlySize, | |
| 111 SharedReadWriteSize, | |
| 112 SharedMiscDataSize, | |
| 113 SharedMiscCodeSize); | |
| 114 if (_permanent_generation == NULL) { | |
| 115 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 | |
| 120 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
| 121 int max_covered_regions) { | |
| 122 switch (rem_set_name()) { | |
| 123 case GenRemSet::CardTable: { | |
| 124 if (barrier_set_name() != BarrierSet::CardTableModRef) | |
| 125 vm_exit_during_initialization("Mismatch between RS and BS."); | |
| 126 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
| 127 return res; | |
| 128 } | |
| 129 default: | |
| 130 guarantee(false, "unrecognized GenRemSet::Name"); | |
| 131 return NULL; | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 // GenCollectorPolicy methods. | |
| 136 | |
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137 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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138 size_t x = base_size / (NewRatio+1); |
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139 size_t new_gen_size = x > min_alignment() ? |
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140 align_size_down(x, min_alignment()) : |
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141 min_alignment(); |
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142 return new_gen_size; |
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143 } |
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144 |
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145 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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146 size_t maximum_size) { |
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147 size_t alignment = min_alignment(); |
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148 size_t max_minus = maximum_size - alignment; |
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149 return desired_size < max_minus ? desired_size : max_minus; |
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150 } |
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151 |
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152 |
| 0 | 153 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
| 154 size_t init_promo_size, | |
| 155 size_t init_survivor_size) { | |
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156 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
| 0 | 157 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
| 158 init_promo_size, | |
| 159 init_survivor_size, | |
| 160 max_gc_minor_pause_sec, | |
| 161 GCTimeRatio); | |
| 162 } | |
| 163 | |
| 164 size_t GenCollectorPolicy::compute_max_alignment() { | |
| 165 // The card marking array and the offset arrays for old generations are | |
| 166 // committed in os pages as well. Make sure they are entirely full (to | |
| 167 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
| 168 // byte entry and the os page size is 4096, the maximum heap size should | |
| 169 // be 512*4096 = 2MB aligned. | |
| 170 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
| 171 | |
| 172 // Parallel GC does its own alignment of the generations to avoid requiring a | |
| 173 // large page (256M on some platforms) for the permanent generation. The | |
| 174 // other collectors should also be updated to do their own alignment and then | |
| 175 // this use of lcm() should be removed. | |
| 176 if (UseLargePages && !UseParallelGC) { | |
| 177 // in presence of large pages we have to make sure that our | |
| 178 // alignment is large page aware | |
| 179 alignment = lcm(os::large_page_size(), alignment); | |
| 180 } | |
| 181 | |
| 182 return alignment; | |
| 183 } | |
| 184 | |
| 185 void GenCollectorPolicy::initialize_flags() { | |
| 186 // All sizes must be multiples of the generation granularity. | |
| 187 set_min_alignment((uintx) Generation::GenGrain); | |
| 188 set_max_alignment(compute_max_alignment()); | |
| 189 assert(max_alignment() >= min_alignment() && | |
| 190 max_alignment() % min_alignment() == 0, | |
| 191 "invalid alignment constraints"); | |
| 192 | |
| 193 CollectorPolicy::initialize_flags(); | |
| 194 | |
| 195 // All generational heaps have a youngest gen; handle those flags here. | |
| 196 | |
| 197 // Adjust max size parameters | |
| 198 if (NewSize > MaxNewSize) { | |
| 199 MaxNewSize = NewSize; | |
| 200 } | |
| 201 NewSize = align_size_down(NewSize, min_alignment()); | |
| 202 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
| 203 | |
| 204 // Check validity of heap flags | |
| 205 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
| 206 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
| 207 | |
| 208 if (NewSize < 3*min_alignment()) { | |
| 209 // make sure there room for eden and two survivor spaces | |
| 210 vm_exit_during_initialization("Too small new size specified"); | |
| 211 } | |
| 212 if (SurvivorRatio < 1 || NewRatio < 1) { | |
| 213 vm_exit_during_initialization("Invalid heap ratio specified"); | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void TwoGenerationCollectorPolicy::initialize_flags() { | |
| 218 GenCollectorPolicy::initialize_flags(); | |
| 219 | |
| 220 OldSize = align_size_down(OldSize, min_alignment()); | |
| 221 if (NewSize + OldSize > MaxHeapSize) { | |
| 222 MaxHeapSize = NewSize + OldSize; | |
| 223 } | |
| 224 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
| 225 | |
| 226 always_do_update_barrier = UseConcMarkSweepGC; | |
| 227 BlockOffsetArrayUseUnallocatedBlock = | |
| 228 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
| 229 | |
| 230 // Check validity of heap flags | |
| 231 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
| 232 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
| 233 } | |
| 234 | |
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235 // Values set on the command line win over any ergonomically |
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236 // set command line parameters. |
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237 // Ergonomic choice of parameters are done before this |
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238 // method is called. Values for command line parameters such as NewSize |
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239 // and MaxNewSize feed those ergonomic choices into this method. |
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240 // This method makes the final generation sizings consistent with |
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241 // themselves and with overall heap sizings. |
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242 // In the absence of explicitly set command line flags, policies |
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243 // such as the use of NewRatio are used to size the generation. |
| 0 | 244 void GenCollectorPolicy::initialize_size_info() { |
| 245 CollectorPolicy::initialize_size_info(); | |
| 246 | |
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247 // min_alignment() is used for alignment within a generation. |
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248 // There is additional alignment done down stream for some |
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249 // collectors that sometimes causes unwanted rounding up of |
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250 // generations sizes. |
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251 |
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252 // Determine maximum size of gen0 |
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253 |
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254 size_t max_new_size = 0; |
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255 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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256 if (MaxNewSize < min_alignment()) { |
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257 max_new_size = min_alignment(); |
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258 } else if (MaxNewSize >= max_heap_byte_size()) { |
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259 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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260 min_alignment()); |
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261 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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262 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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263 "new generation size of " SIZE_FORMAT "k will be used.", |
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264 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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265 } else { |
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266 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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267 } |
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268 |
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269 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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270 // specially at this point to just use an ergonomically set |
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271 // MaxNewSize to set max_new_size. For cases with small |
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272 // heaps such a policy often did not work because the MaxNewSize |
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273 // was larger than the entire heap. The interpretation given |
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274 // to ergonomically set flags is that the flags are set |
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275 // by different collectors for their own special needs but |
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276 // are not allowed to badly shape the heap. This allows the |
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277 // different collectors to decide what's best for themselves |
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278 // without having to factor in the overall heap shape. It |
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279 // can be the case in the future that the collectors would |
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280 // only make "wise" ergonomics choices and this policy could |
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281 // just accept those choices. The choices currently made are |
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282 // not always "wise". |
| 0 | 283 } else { |
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284 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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285 // Bound the maximum size by NewSize below (since it historically |
| 0 | 286 // would have been NewSize and because the NewRatio calculation could |
| 287 // yield a size that is too small) and bound it by MaxNewSize above. | |
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288 // Ergonomics plays here by previously calculating the desired |
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289 // NewSize and MaxNewSize. |
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290 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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291 } |
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292 assert(max_new_size > 0, "All paths should set max_new_size"); |
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293 |
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294 // Given the maximum gen0 size, determine the initial and |
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295 // minimum sizes. |
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296 |
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297 if (max_heap_byte_size() == min_heap_byte_size()) { |
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298 // The maximum and minimum heap sizes are the same so |
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299 // the generations minimum and initial must be the |
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300 // same as its maximum. |
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301 set_min_gen0_size(max_new_size); |
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302 set_initial_gen0_size(max_new_size); |
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303 set_max_gen0_size(max_new_size); |
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304 } else { |
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305 size_t desired_new_size = 0; |
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306 if (!FLAG_IS_DEFAULT(NewSize)) { |
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307 // If NewSize is set ergonomically (for example by cms), it |
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308 // would make sense to use it. If it is used, also use it |
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309 // to set the initial size. Although there is no reason |
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310 // the minimum size and the initial size have to be the same, |
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311 // the current implementation gets into trouble during the calculation |
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312 // of the tenured generation sizes if they are different. |
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313 // Note that this makes the initial size and the minimum size |
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314 // generally small compared to the NewRatio calculation. |
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315 _min_gen0_size = NewSize; |
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316 desired_new_size = NewSize; |
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317 max_new_size = MAX2(max_new_size, NewSize); |
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318 } else { |
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319 // For the case where NewSize is the default, use NewRatio |
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320 // to size the minimum and initial generation sizes. |
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321 // Use the default NewSize as the floor for these values. If |
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322 // NewRatio is overly large, the resulting sizes can be too |
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323 // small. |
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324 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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325 NewSize); |
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326 desired_new_size = |
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327 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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328 NewSize); |
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329 } |
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330 |
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331 assert(_min_gen0_size > 0, "Sanity check"); |
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332 set_initial_gen0_size(desired_new_size); |
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333 set_max_gen0_size(max_new_size); |
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334 |
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335 // At this point the desirable initial and minimum sizes have been |
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336 // determined without regard to the maximum sizes. |
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337 |
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338 // Bound the sizes by the corresponding overall heap sizes. |
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339 set_min_gen0_size( |
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340 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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341 set_initial_gen0_size( |
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342 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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343 set_max_gen0_size( |
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344 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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345 |
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346 // At this point all three sizes have been checked against the |
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347 // maximum sizes but have not been checked for consistency |
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348 // amoung the three. |
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349 |
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350 // Final check min <= initial <= max |
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351 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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352 set_initial_gen0_size( |
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353 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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354 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
| 0 | 355 } |
| 356 | |
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357 if (PrintGCDetails && Verbose) { |
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358 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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359 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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360 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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361 } |
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362 } |
| 0 | 363 |
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364 // Call this method during the sizing of the gen1 to make |
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365 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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366 // the most freedom in sizing because it is done before the |
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367 // policy for gen1 is applied. Once gen1 policies have been applied, |
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368 // there may be conflicts in the shape of the heap and this method |
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369 // is used to make the needed adjustments. The application of the |
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370 // policies could be more sophisticated (iterative for example) but |
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371 // keeping it simple also seems a worthwhile goal. |
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372 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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373 size_t* gen1_size_ptr, |
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374 size_t heap_size, |
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375 size_t min_gen0_size) { |
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376 bool result = false; |
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377 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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378 if (((*gen0_size_ptr + OldSize) > heap_size) && |
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379 (heap_size - min_gen0_size) >= min_alignment()) { |
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380 // Adjust gen0 down to accomodate OldSize |
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381 *gen0_size_ptr = heap_size - min_gen0_size; |
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382 *gen0_size_ptr = |
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383 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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384 min_alignment()); |
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385 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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386 result = true; |
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387 } else { |
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388 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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389 *gen1_size_ptr = |
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390 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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391 min_alignment()); |
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392 } |
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393 } |
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394 return result; |
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395 } |
| 0 | 396 |
|
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397 // Minimum sizes of the generations may be different than |
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398 // the initial sizes. An inconsistently is permitted here |
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399 // in the total size that can be specified explicitly by |
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400 // command line specification of OldSize and NewSize and |
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401 // also a command line specification of -Xms. Issue a warning |
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402 // but allow the values to pass. |
| 0 | 403 |
| 404 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
| 405 GenCollectorPolicy::initialize_size_info(); | |
| 406 | |
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407 // At this point the minimum, initial and maximum sizes |
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408 // of the overall heap and of gen0 have been determined. |
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409 // The maximum gen1 size can be determined from the maximum gen0 |
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410 // and maximum heap size since not explicit flags exits |
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411 // for setting the gen1 maximum. |
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412 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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413 _max_gen1_size = |
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414 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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415 min_alignment()); |
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416 // If no explicit command line flag has been set for the |
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417 // gen1 size, use what is left for gen1. |
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418 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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419 // The user has not specified any value or ergonomics |
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420 // has chosen a value (which may or may not be consistent |
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421 // with the overall heap size). In either case make |
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422 // the minimum, maximum and initial sizes consistent |
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423 // with the gen0 sizes and the overall heap sizes. |
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424 assert(min_heap_byte_size() > _min_gen0_size, |
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425 "gen0 has an unexpected minimum size"); |
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426 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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427 set_min_gen1_size( |
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428 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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429 min_alignment())); |
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430 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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431 set_initial_gen1_size( |
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432 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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433 min_alignment())); |
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434 |
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435 } else { |
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436 // It's been explicitly set on the command line. Use the |
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437 // OldSize and then determine the consequences. |
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438 set_min_gen1_size(OldSize); |
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439 set_initial_gen1_size(OldSize); |
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440 |
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441 // If the user has explicitly set an OldSize that is inconsistent |
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442 // with other command line flags, issue a warning. |
| 0 | 443 // The generation minimums and the overall heap mimimum should |
| 444 // be within one heap alignment. | |
|
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445 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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446 min_heap_byte_size()) { |
| 0 | 447 warning("Inconsistency between minimum heap size and minimum " |
|
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448 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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449 min_heap_byte_size()); |
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450 } |
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451 if ((OldSize > _max_gen1_size)) { |
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452 warning("Inconsistency between maximum heap size and maximum " |
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453 "generation sizes: using maximum heap = " SIZE_FORMAT |
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454 " -XX:OldSize flag is being ignored", |
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455 max_heap_byte_size()); |
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456 } |
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457 // If there is an inconsistency between the OldSize and the minimum and/or |
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458 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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459 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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460 min_heap_byte_size(), OldSize)) { |
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461 if (PrintGCDetails && Verbose) { |
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462 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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463 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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464 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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465 } |
| 0 | 466 } |
|
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467 // Initial size |
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468 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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469 initial_heap_byte_size(), OldSize)) { |
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470 if (PrintGCDetails && Verbose) { |
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471 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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472 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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473 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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474 } |
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475 } |
| 0 | 476 } |
|
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477 // Enforce the maximum gen1 size. |
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478 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
| 0 | 479 |
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480 // Check that min gen1 <= initial gen1 <= max gen1 |
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481 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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482 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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483 |
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484 if (PrintGCDetails && Verbose) { |
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485 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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486 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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487 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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488 } |
| 0 | 489 } |
| 490 | |
| 491 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
| 492 bool is_tlab, | |
| 493 bool* gc_overhead_limit_was_exceeded) { | |
| 494 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 495 | |
| 496 debug_only(gch->check_for_valid_allocation_state()); | |
| 497 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 498 HeapWord* result = NULL; | |
| 499 | |
| 500 // Loop until the allocation is satisified, | |
| 501 // or unsatisfied after GC. | |
| 502 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 503 HandleMark hm; // discard any handles allocated in each iteration | |
| 504 | |
| 505 // First allocation attempt is lock-free. | |
| 506 Generation *gen0 = gch->get_gen(0); | |
| 507 assert(gen0->supports_inline_contig_alloc(), | |
| 508 "Otherwise, must do alloc within heap lock"); | |
| 509 if (gen0->should_allocate(size, is_tlab)) { | |
| 510 result = gen0->par_allocate(size, is_tlab); | |
| 511 if (result != NULL) { | |
| 512 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 513 return result; | |
| 514 } | |
| 515 } | |
| 516 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
| 517 { | |
| 518 MutexLocker ml(Heap_lock); | |
| 519 if (PrintGC && Verbose) { | |
| 520 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
| 521 " attempting locked slow path allocation"); | |
| 522 } | |
| 523 // Note that only large objects get a shot at being | |
| 524 // allocated in later generations. | |
| 525 bool first_only = ! should_try_older_generation_allocation(size); | |
| 526 | |
| 527 result = gch->attempt_allocation(size, is_tlab, first_only); | |
| 528 if (result != NULL) { | |
| 529 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 530 return result; | |
| 531 } | |
| 532 | |
| 533 // There are NULL's returned for different circumstances below. | |
| 534 // In general gc_overhead_limit_was_exceeded should be false so | |
| 535 // set it so here and reset it to true only if the gc time | |
| 536 // limit is being exceeded as checked below. | |
| 537 *gc_overhead_limit_was_exceeded = false; | |
| 538 | |
| 539 if (GC_locker::is_active_and_needs_gc()) { | |
| 540 if (is_tlab) { | |
| 541 return NULL; // Caller will retry allocating individual object | |
| 542 } | |
| 543 if (!gch->is_maximal_no_gc()) { | |
| 544 // Try and expand heap to satisfy request | |
| 545 result = expand_heap_and_allocate(size, is_tlab); | |
| 546 // result could be null if we are out of space | |
| 547 if (result != NULL) { | |
| 548 return result; | |
| 549 } | |
| 550 } | |
| 551 | |
| 552 // If this thread is not in a jni critical section, we stall | |
| 553 // the requestor until the critical section has cleared and | |
| 554 // GC allowed. When the critical section clears, a GC is | |
| 555 // initiated by the last thread exiting the critical section; so | |
| 556 // we retry the allocation sequence from the beginning of the loop, | |
| 557 // rather than causing more, now probably unnecessary, GC attempts. | |
| 558 JavaThread* jthr = JavaThread::current(); | |
| 559 if (!jthr->in_critical()) { | |
| 560 MutexUnlocker mul(Heap_lock); | |
| 561 // Wait for JNI critical section to be exited | |
| 562 GC_locker::stall_until_clear(); | |
| 563 continue; | |
| 564 } else { | |
| 565 if (CheckJNICalls) { | |
| 566 fatal("Possible deadlock due to allocating while" | |
| 567 " in jni critical section"); | |
| 568 } | |
| 569 return NULL; | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 // Read the gc count while the heap lock is held. | |
| 574 gc_count_before = Universe::heap()->total_collections(); | |
| 575 } | |
| 576 | |
| 577 // Allocation has failed and a collection is about | |
| 578 // to be done. If the gc time limit was exceeded the | |
| 579 // last time a collection was done, return NULL so | |
| 580 // that an out-of-memory will be thrown. Clear | |
| 581 // gc_time_limit_exceeded so that subsequent attempts | |
| 582 // at a collection will be made. | |
| 583 if (size_policy()->gc_time_limit_exceeded()) { | |
| 584 *gc_overhead_limit_was_exceeded = true; | |
| 585 size_policy()->set_gc_time_limit_exceeded(false); | |
| 586 return NULL; | |
| 587 } | |
| 588 | |
| 589 VM_GenCollectForAllocation op(size, | |
| 590 is_tlab, | |
| 591 gc_count_before); | |
| 592 VMThread::execute(&op); | |
| 593 if (op.prologue_succeeded()) { | |
| 594 result = op.result(); | |
| 595 if (op.gc_locked()) { | |
| 596 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
| 597 continue; // retry and/or stall as necessary | |
| 598 } | |
| 599 assert(result == NULL || gch->is_in_reserved(result), | |
| 600 "result not in heap"); | |
| 601 return result; | |
| 602 } | |
| 603 | |
| 604 // Give a warning if we seem to be looping forever. | |
| 605 if ((QueuedAllocationWarningCount > 0) && | |
| 606 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 607 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
| 608 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
| 609 } | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
| 614 bool is_tlab) { | |
| 615 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 616 HeapWord* result = NULL; | |
| 617 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
| 618 Generation *gen = gch->get_gen(i); | |
| 619 if (gen->should_allocate(size, is_tlab)) { | |
| 620 result = gen->expand_and_allocate(size, is_tlab); | |
| 621 } | |
| 622 } | |
| 623 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
| 624 return result; | |
| 625 } | |
| 626 | |
| 627 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 628 bool is_tlab) { | |
| 629 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 630 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
| 631 HeapWord* result = NULL; | |
| 632 | |
| 633 assert(size != 0, "Precondition violated"); | |
| 634 if (GC_locker::is_active_and_needs_gc()) { | |
| 635 // GC locker is active; instead of a collection we will attempt | |
| 636 // to expand the heap, if there's room for expansion. | |
| 637 if (!gch->is_maximal_no_gc()) { | |
| 638 result = expand_heap_and_allocate(size, is_tlab); | |
| 639 } | |
| 640 return result; // could be null if we are out of space | |
| 641 } else if (!gch->incremental_collection_will_fail()) { | |
| 642 // The gc_prologues have not executed yet. The value | |
| 643 // for incremental_collection_will_fail() is the remanent | |
| 644 // of the last collection. | |
| 645 // Do an incremental collection. | |
| 646 gch->do_collection(false /* full */, | |
| 647 false /* clear_all_soft_refs */, | |
| 648 size /* size */, | |
| 649 is_tlab /* is_tlab */, | |
| 650 number_of_generations() - 1 /* max_level */); | |
| 651 } else { | |
| 652 // Try a full collection; see delta for bug id 6266275 | |
| 653 // for the original code and why this has been simplified | |
| 654 // with from-space allocation criteria modified and | |
| 655 // such allocation moved out of the safepoint path. | |
| 656 gch->do_collection(true /* full */, | |
| 657 false /* clear_all_soft_refs */, | |
| 658 size /* size */, | |
| 659 is_tlab /* is_tlab */, | |
| 660 number_of_generations() - 1 /* max_level */); | |
| 661 } | |
| 662 | |
| 663 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
| 664 | |
| 665 if (result != NULL) { | |
| 666 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 667 return result; | |
| 668 } | |
| 669 | |
| 670 // OK, collection failed, try expansion. | |
| 671 result = expand_heap_and_allocate(size, is_tlab); | |
| 672 if (result != NULL) { | |
| 673 return result; | |
| 674 } | |
| 675 | |
| 676 // If we reach this point, we're really out of memory. Try every trick | |
| 677 // we can to reclaim memory. Force collection of soft references. Force | |
| 678 // a complete compaction of the heap. Any additional methods for finding | |
| 679 // free memory should be here, especially if they are expensive. If this | |
| 680 // attempt fails, an OOM exception will be thrown. | |
| 681 { | |
| 682 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
| 683 | |
| 684 gch->do_collection(true /* full */, | |
| 685 true /* clear_all_soft_refs */, | |
| 686 size /* size */, | |
| 687 is_tlab /* is_tlab */, | |
| 688 number_of_generations() - 1 /* max_level */); | |
| 689 } | |
| 690 | |
| 691 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
| 692 if (result != NULL) { | |
| 693 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 694 return result; | |
| 695 } | |
| 696 | |
| 697 // What else? We might try synchronous finalization later. If the total | |
| 698 // space available is large enough for the allocation, then a more | |
| 699 // complete compaction phase than we've tried so far might be | |
| 700 // appropriate. | |
| 701 return NULL; | |
| 702 } | |
| 703 | |
| 704 size_t GenCollectorPolicy::large_typearray_limit() { | |
| 705 return FastAllocateSizeLimit; | |
| 706 } | |
| 707 | |
| 708 // Return true if any of the following is true: | |
| 709 // . the allocation won't fit into the current young gen heap | |
| 710 // . gc locker is occupied (jni critical section) | |
| 711 // . heap memory is tight -- the most recent previous collection | |
| 712 // was a full collection because a partial collection (would | |
| 713 // have) failed and is likely to fail again | |
| 714 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
| 715 size_t word_size) const { | |
| 716 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 717 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
| 718 return (word_size > heap_word_size(gen0_capacity)) | |
| 719 || (GC_locker::is_active_and_needs_gc()) | |
| 720 || ( gch->last_incremental_collection_failed() | |
| 721 && gch->incremental_collection_will_fail()); | |
| 722 } | |
| 723 | |
| 724 | |
| 725 // | |
| 726 // MarkSweepPolicy methods | |
| 727 // | |
| 728 | |
| 729 MarkSweepPolicy::MarkSweepPolicy() { | |
| 730 initialize_all(); | |
| 731 } | |
| 732 | |
| 733 void MarkSweepPolicy::initialize_generations() { | |
| 734 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 735 _generations = new GenerationSpecPtr[number_of_generations()]; | |
| 736 if (_generations == NULL) | |
| 737 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 738 | |
| 739 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 740 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
| 741 } else { | |
| 742 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
| 743 } | |
| 744 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
| 745 | |
| 746 if (_generations[0] == NULL || _generations[1] == NULL) | |
| 747 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 748 } | |
| 749 | |
| 750 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
| 751 // initialize the policy counters - 2 collectors, 3 generations | |
| 752 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 753 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
| 754 } | |
| 755 else { | |
| 756 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
| 757 } | |
| 758 } |