Mercurial > hg > graal-jvmci-8
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 |
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date | Wed, 02 Jul 2008 12:55:16 -0700 |
parents | 183f41cf8bfe |
children | 1ee8caae33af |
rev | line source |
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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 | |
13
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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 } |