Mercurial > hg > graal-compiler
annotate src/share/vm/memory/collectorPolicy.cpp @ 1064:473cce303f13
6887571: Increase default heap config sizes
Summary: Apply modification of existing server heap size ergo to all collectors except CMS.
Reviewed-by: jmasa, ysr, xlu
| author | phh |
|---|---|
| date | Wed, 28 Oct 2009 16:25:51 -0400 |
| parents | 1ee8caae33af |
| children | 0bfd3fb24150 |
| 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 } | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
34 PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment())); |
| 0 | 35 MaxPermSize = align_size_up(MaxPermSize, max_alignment()); |
| 36 | |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
37 MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment())); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
38 MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment())); |
| 0 | 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 | |
| 1064 | 58 set_initial_heap_byte_size(InitialHeapSize); |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
59 if (initial_heap_byte_size() == 0) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
60 set_initial_heap_byte_size(NewSize + OldSize); |
| 0 | 61 } |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
62 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
63 min_alignment())); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
64 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
65 set_min_heap_byte_size(Arguments::min_heap_size()); |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
66 if (min_heap_byte_size() == 0) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
67 set_min_heap_byte_size(NewSize + OldSize); |
| 0 | 68 } |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
69 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
70 min_alignment())); |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
71 |
|
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
72 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
| 0 | 73 |
| 74 // Check heap parameter properties | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
75 if (initial_heap_byte_size() < M) { |
| 0 | 76 vm_exit_during_initialization("Too small initial heap"); |
| 77 } | |
| 78 // Check heap parameter properties | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
79 if (min_heap_byte_size() < M) { |
| 0 | 80 vm_exit_during_initialization("Too small minimum heap"); |
| 81 } | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
82 if (initial_heap_byte_size() <= NewSize) { |
| 0 | 83 // make sure there is at least some room in old space |
| 84 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
| 85 } | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
86 if (max_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 87 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
| 88 } | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
89 if (initial_heap_byte_size() < min_heap_byte_size()) { |
| 0 | 90 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
| 91 } | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
92 if (max_heap_byte_size() < initial_heap_byte_size()) { |
| 0 | 93 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
| 94 } | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
95 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
96 if (PrintGCDetails && Verbose) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
97 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
98 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
99 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
100 } |
| 0 | 101 } |
| 102 | |
| 103 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
| 104 _permanent_generation = | |
| 105 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
| 106 SharedReadOnlySize, | |
| 107 SharedReadWriteSize, | |
| 108 SharedMiscDataSize, | |
| 109 SharedMiscCodeSize); | |
| 110 if (_permanent_generation == NULL) { | |
| 111 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 | |
| 116 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
| 117 int max_covered_regions) { | |
| 118 switch (rem_set_name()) { | |
| 119 case GenRemSet::CardTable: { | |
| 120 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
| 121 return res; | |
| 122 } | |
| 123 default: | |
| 124 guarantee(false, "unrecognized GenRemSet::Name"); | |
| 125 return NULL; | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 // GenCollectorPolicy methods. | |
| 130 | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
131 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
132 size_t x = base_size / (NewRatio+1); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
133 size_t new_gen_size = x > min_alignment() ? |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
134 align_size_down(x, min_alignment()) : |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
135 min_alignment(); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
136 return new_gen_size; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
137 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
138 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
139 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
140 size_t maximum_size) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
141 size_t alignment = min_alignment(); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
142 size_t max_minus = maximum_size - alignment; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
143 return desired_size < max_minus ? desired_size : max_minus; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
144 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
145 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
146 |
| 0 | 147 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
| 148 size_t init_promo_size, | |
| 149 size_t init_survivor_size) { | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
150 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
| 0 | 151 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
| 152 init_promo_size, | |
| 153 init_survivor_size, | |
| 154 max_gc_minor_pause_sec, | |
| 155 GCTimeRatio); | |
| 156 } | |
| 157 | |
| 158 size_t GenCollectorPolicy::compute_max_alignment() { | |
| 159 // The card marking array and the offset arrays for old generations are | |
| 160 // committed in os pages as well. Make sure they are entirely full (to | |
| 161 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
| 162 // byte entry and the os page size is 4096, the maximum heap size should | |
| 163 // be 512*4096 = 2MB aligned. | |
| 164 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
| 165 | |
| 166 // Parallel GC does its own alignment of the generations to avoid requiring a | |
| 167 // large page (256M on some platforms) for the permanent generation. The | |
| 168 // other collectors should also be updated to do their own alignment and then | |
| 169 // this use of lcm() should be removed. | |
| 170 if (UseLargePages && !UseParallelGC) { | |
| 171 // in presence of large pages we have to make sure that our | |
| 172 // alignment is large page aware | |
| 173 alignment = lcm(os::large_page_size(), alignment); | |
| 174 } | |
| 175 | |
| 176 return alignment; | |
| 177 } | |
| 178 | |
| 179 void GenCollectorPolicy::initialize_flags() { | |
| 180 // All sizes must be multiples of the generation granularity. | |
| 181 set_min_alignment((uintx) Generation::GenGrain); | |
| 182 set_max_alignment(compute_max_alignment()); | |
| 183 assert(max_alignment() >= min_alignment() && | |
| 184 max_alignment() % min_alignment() == 0, | |
| 185 "invalid alignment constraints"); | |
| 186 | |
| 187 CollectorPolicy::initialize_flags(); | |
| 188 | |
| 189 // All generational heaps have a youngest gen; handle those flags here. | |
| 190 | |
| 191 // Adjust max size parameters | |
| 192 if (NewSize > MaxNewSize) { | |
| 193 MaxNewSize = NewSize; | |
| 194 } | |
| 195 NewSize = align_size_down(NewSize, min_alignment()); | |
| 196 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
| 197 | |
| 198 // Check validity of heap flags | |
| 199 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
| 200 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
| 201 | |
| 202 if (NewSize < 3*min_alignment()) { | |
| 203 // make sure there room for eden and two survivor spaces | |
| 204 vm_exit_during_initialization("Too small new size specified"); | |
| 205 } | |
| 206 if (SurvivorRatio < 1 || NewRatio < 1) { | |
| 207 vm_exit_during_initialization("Invalid heap ratio specified"); | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 void TwoGenerationCollectorPolicy::initialize_flags() { | |
| 212 GenCollectorPolicy::initialize_flags(); | |
| 213 | |
| 214 OldSize = align_size_down(OldSize, min_alignment()); | |
| 215 if (NewSize + OldSize > MaxHeapSize) { | |
| 216 MaxHeapSize = NewSize + OldSize; | |
| 217 } | |
| 218 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
| 219 | |
| 220 always_do_update_barrier = UseConcMarkSweepGC; | |
| 221 BlockOffsetArrayUseUnallocatedBlock = | |
| 222 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
| 223 | |
| 224 // Check validity of heap flags | |
| 225 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
| 226 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
| 227 } | |
| 228 | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
229 // Values set on the command line win over any ergonomically |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
230 // set command line parameters. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
231 // Ergonomic choice of parameters are done before this |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
232 // method is called. Values for command line parameters such as NewSize |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
233 // and MaxNewSize feed those ergonomic choices into this method. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
234 // This method makes the final generation sizings consistent with |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
235 // themselves and with overall heap sizings. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
236 // In the absence of explicitly set command line flags, policies |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
237 // such as the use of NewRatio are used to size the generation. |
| 0 | 238 void GenCollectorPolicy::initialize_size_info() { |
| 239 CollectorPolicy::initialize_size_info(); | |
| 240 | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
241 // min_alignment() is used for alignment within a generation. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
242 // There is additional alignment done down stream for some |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
243 // collectors that sometimes causes unwanted rounding up of |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
244 // generations sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
245 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
246 // Determine maximum size of gen0 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
247 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
248 size_t max_new_size = 0; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
249 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
250 if (MaxNewSize < min_alignment()) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
251 max_new_size = min_alignment(); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
252 } else if (MaxNewSize >= max_heap_byte_size()) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
253 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
254 min_alignment()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
255 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
256 "greater than the entire heap (" SIZE_FORMAT "k). A " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
257 "new generation size of " SIZE_FORMAT "k will be used.", |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
258 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
259 } else { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
260 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
261 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
262 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
263 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
264 // specially at this point to just use an ergonomically set |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
265 // MaxNewSize to set max_new_size. For cases with small |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
266 // heaps such a policy often did not work because the MaxNewSize |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
267 // was larger than the entire heap. The interpretation given |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
268 // to ergonomically set flags is that the flags are set |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
269 // by different collectors for their own special needs but |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
270 // are not allowed to badly shape the heap. This allows the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
271 // different collectors to decide what's best for themselves |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
272 // without having to factor in the overall heap shape. It |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
273 // can be the case in the future that the collectors would |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
274 // only make "wise" ergonomics choices and this policy could |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
275 // just accept those choices. The choices currently made are |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
276 // not always "wise". |
| 0 | 277 } else { |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
278 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
279 // Bound the maximum size by NewSize below (since it historically |
| 0 | 280 // would have been NewSize and because the NewRatio calculation could |
| 281 // yield a size that is too small) and bound it by MaxNewSize above. | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
282 // Ergonomics plays here by previously calculating the desired |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
283 // NewSize and MaxNewSize. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
284 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
285 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
286 assert(max_new_size > 0, "All paths should set max_new_size"); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
287 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
288 // Given the maximum gen0 size, determine the initial and |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
289 // minimum sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
290 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
291 if (max_heap_byte_size() == min_heap_byte_size()) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
292 // The maximum and minimum heap sizes are the same so |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
293 // the generations minimum and initial must be the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
294 // same as its maximum. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
295 set_min_gen0_size(max_new_size); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
296 set_initial_gen0_size(max_new_size); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
297 set_max_gen0_size(max_new_size); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
298 } else { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
299 size_t desired_new_size = 0; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
300 if (!FLAG_IS_DEFAULT(NewSize)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
301 // If NewSize is set ergonomically (for example by cms), it |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
302 // would make sense to use it. If it is used, also use it |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
303 // to set the initial size. Although there is no reason |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
304 // the minimum size and the initial size have to be the same, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
305 // the current implementation gets into trouble during the calculation |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
306 // of the tenured generation sizes if they are different. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
307 // Note that this makes the initial size and the minimum size |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
308 // generally small compared to the NewRatio calculation. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
309 _min_gen0_size = NewSize; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
310 desired_new_size = NewSize; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
311 max_new_size = MAX2(max_new_size, NewSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
312 } else { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
313 // For the case where NewSize is the default, use NewRatio |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
314 // to size the minimum and initial generation sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
315 // Use the default NewSize as the floor for these values. If |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
316 // NewRatio is overly large, the resulting sizes can be too |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
317 // small. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
318 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
319 NewSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
320 desired_new_size = |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
321 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
322 NewSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
323 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
324 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
325 assert(_min_gen0_size > 0, "Sanity check"); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
326 set_initial_gen0_size(desired_new_size); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
327 set_max_gen0_size(max_new_size); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
328 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
329 // At this point the desirable initial and minimum sizes have been |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
330 // determined without regard to the maximum sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
331 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
332 // Bound the sizes by the corresponding overall heap sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
333 set_min_gen0_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
334 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
335 set_initial_gen0_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
336 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
337 set_max_gen0_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
338 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
339 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
340 // At this point all three sizes have been checked against the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
341 // maximum sizes but have not been checked for consistency |
|
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
13
diff
changeset
|
342 // among the three. |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
343 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
344 // Final check min <= initial <= max |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
345 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
346 set_initial_gen0_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
347 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
348 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
| 0 | 349 } |
| 350 | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
351 if (PrintGCDetails && Verbose) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
352 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
353 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
354 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
355 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
356 } |
| 0 | 357 |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
358 // Call this method during the sizing of the gen1 to make |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
359 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
360 // the most freedom in sizing because it is done before the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
361 // policy for gen1 is applied. Once gen1 policies have been applied, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
362 // there may be conflicts in the shape of the heap and this method |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
363 // is used to make the needed adjustments. The application of the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
364 // policies could be more sophisticated (iterative for example) but |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
365 // keeping it simple also seems a worthwhile goal. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
366 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
367 size_t* gen1_size_ptr, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
368 size_t heap_size, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
369 size_t min_gen0_size) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
370 bool result = false; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
371 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
372 if (((*gen0_size_ptr + OldSize) > heap_size) && |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
373 (heap_size - min_gen0_size) >= min_alignment()) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
374 // Adjust gen0 down to accomodate OldSize |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
375 *gen0_size_ptr = heap_size - min_gen0_size; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
376 *gen0_size_ptr = |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
377 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
378 min_alignment()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
379 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
380 result = true; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
381 } else { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
382 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
383 *gen1_size_ptr = |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
384 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
385 min_alignment()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
386 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
387 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
388 return result; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
389 } |
| 0 | 390 |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
391 // Minimum sizes of the generations may be different than |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
392 // the initial sizes. An inconsistently is permitted here |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
393 // in the total size that can be specified explicitly by |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
394 // command line specification of OldSize and NewSize and |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
395 // also a command line specification of -Xms. Issue a warning |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
396 // but allow the values to pass. |
| 0 | 397 |
| 398 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
| 399 GenCollectorPolicy::initialize_size_info(); | |
| 400 | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
401 // At this point the minimum, initial and maximum sizes |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
402 // of the overall heap and of gen0 have been determined. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
403 // The maximum gen1 size can be determined from the maximum gen0 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
404 // and maximum heap size since not explicit flags exits |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
405 // for setting the gen1 maximum. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
406 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
407 _max_gen1_size = |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
408 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
409 min_alignment()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
410 // If no explicit command line flag has been set for the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
411 // gen1 size, use what is left for gen1. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
412 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
413 // The user has not specified any value or ergonomics |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
414 // has chosen a value (which may or may not be consistent |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
415 // with the overall heap size). In either case make |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
416 // the minimum, maximum and initial sizes consistent |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
417 // with the gen0 sizes and the overall heap sizes. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
418 assert(min_heap_byte_size() > _min_gen0_size, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
419 "gen0 has an unexpected minimum size"); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
420 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
421 set_min_gen1_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
422 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
423 min_alignment())); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
424 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
425 set_initial_gen1_size( |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
426 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
427 min_alignment())); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
428 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
429 } else { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
430 // It's been explicitly set on the command line. Use the |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
431 // OldSize and then determine the consequences. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
432 set_min_gen1_size(OldSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
433 set_initial_gen1_size(OldSize); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
434 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
435 // If the user has explicitly set an OldSize that is inconsistent |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
436 // with other command line flags, issue a warning. |
| 0 | 437 // The generation minimums and the overall heap mimimum should |
| 438 // be within one heap alignment. | |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
439 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
440 min_heap_byte_size()) { |
| 0 | 441 warning("Inconsistency between minimum heap size and minimum " |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
442 "generation sizes: using minimum heap = " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
443 min_heap_byte_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
444 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
445 if ((OldSize > _max_gen1_size)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
446 warning("Inconsistency between maximum heap size and maximum " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
447 "generation sizes: using maximum heap = " SIZE_FORMAT |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
448 " -XX:OldSize flag is being ignored", |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
449 max_heap_byte_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
450 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
451 // If there is an inconsistency between the OldSize and the minimum and/or |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
452 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
453 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
454 min_heap_byte_size(), OldSize)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
455 if (PrintGCDetails && Verbose) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
456 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
457 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
458 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
459 } |
| 0 | 460 } |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
461 // Initial size |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
462 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
463 initial_heap_byte_size(), OldSize)) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
464 if (PrintGCDetails && Verbose) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
465 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
466 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
467 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
468 } |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
469 } |
| 0 | 470 } |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
471 // Enforce the maximum gen1 size. |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
472 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
| 0 | 473 |
|
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
474 // Check that min gen1 <= initial gen1 <= max gen1 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
475 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
476 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
477 |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
478 if (PrintGCDetails && Verbose) { |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
479 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
480 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
481 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
|
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
482 } |
| 0 | 483 } |
| 484 | |
| 485 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
| 486 bool is_tlab, | |
| 487 bool* gc_overhead_limit_was_exceeded) { | |
| 488 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 489 | |
| 490 debug_only(gch->check_for_valid_allocation_state()); | |
| 491 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 492 HeapWord* result = NULL; | |
| 493 | |
| 494 // Loop until the allocation is satisified, | |
| 495 // or unsatisfied after GC. | |
| 496 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 497 HandleMark hm; // discard any handles allocated in each iteration | |
| 498 | |
| 499 // First allocation attempt is lock-free. | |
| 500 Generation *gen0 = gch->get_gen(0); | |
| 501 assert(gen0->supports_inline_contig_alloc(), | |
| 502 "Otherwise, must do alloc within heap lock"); | |
| 503 if (gen0->should_allocate(size, is_tlab)) { | |
| 504 result = gen0->par_allocate(size, is_tlab); | |
| 505 if (result != NULL) { | |
| 506 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 507 return result; | |
| 508 } | |
| 509 } | |
| 510 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
| 511 { | |
| 512 MutexLocker ml(Heap_lock); | |
| 513 if (PrintGC && Verbose) { | |
| 514 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
| 515 " attempting locked slow path allocation"); | |
| 516 } | |
| 517 // Note that only large objects get a shot at being | |
| 518 // allocated in later generations. | |
| 519 bool first_only = ! should_try_older_generation_allocation(size); | |
| 520 | |
| 521 result = gch->attempt_allocation(size, is_tlab, first_only); | |
| 522 if (result != NULL) { | |
| 523 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 524 return result; | |
| 525 } | |
| 526 | |
| 527 // There are NULL's returned for different circumstances below. | |
| 528 // In general gc_overhead_limit_was_exceeded should be false so | |
| 529 // set it so here and reset it to true only if the gc time | |
| 530 // limit is being exceeded as checked below. | |
| 531 *gc_overhead_limit_was_exceeded = false; | |
| 532 | |
| 533 if (GC_locker::is_active_and_needs_gc()) { | |
| 534 if (is_tlab) { | |
| 535 return NULL; // Caller will retry allocating individual object | |
| 536 } | |
| 537 if (!gch->is_maximal_no_gc()) { | |
| 538 // Try and expand heap to satisfy request | |
| 539 result = expand_heap_and_allocate(size, is_tlab); | |
| 540 // result could be null if we are out of space | |
| 541 if (result != NULL) { | |
| 542 return result; | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 // If this thread is not in a jni critical section, we stall | |
| 547 // the requestor until the critical section has cleared and | |
| 548 // GC allowed. When the critical section clears, a GC is | |
| 549 // initiated by the last thread exiting the critical section; so | |
| 550 // we retry the allocation sequence from the beginning of the loop, | |
| 551 // rather than causing more, now probably unnecessary, GC attempts. | |
| 552 JavaThread* jthr = JavaThread::current(); | |
| 553 if (!jthr->in_critical()) { | |
| 554 MutexUnlocker mul(Heap_lock); | |
| 555 // Wait for JNI critical section to be exited | |
| 556 GC_locker::stall_until_clear(); | |
| 557 continue; | |
| 558 } else { | |
| 559 if (CheckJNICalls) { | |
| 560 fatal("Possible deadlock due to allocating while" | |
| 561 " in jni critical section"); | |
| 562 } | |
| 563 return NULL; | |
| 564 } | |
| 565 } | |
| 566 | |
| 567 // Read the gc count while the heap lock is held. | |
| 568 gc_count_before = Universe::heap()->total_collections(); | |
| 569 } | |
| 570 | |
| 571 // Allocation has failed and a collection is about | |
| 572 // to be done. If the gc time limit was exceeded the | |
| 573 // last time a collection was done, return NULL so | |
| 574 // that an out-of-memory will be thrown. Clear | |
| 575 // gc_time_limit_exceeded so that subsequent attempts | |
| 576 // at a collection will be made. | |
| 577 if (size_policy()->gc_time_limit_exceeded()) { | |
| 578 *gc_overhead_limit_was_exceeded = true; | |
| 579 size_policy()->set_gc_time_limit_exceeded(false); | |
| 580 return NULL; | |
| 581 } | |
| 582 | |
| 583 VM_GenCollectForAllocation op(size, | |
| 584 is_tlab, | |
| 585 gc_count_before); | |
| 586 VMThread::execute(&op); | |
| 587 if (op.prologue_succeeded()) { | |
| 588 result = op.result(); | |
| 589 if (op.gc_locked()) { | |
| 590 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
| 591 continue; // retry and/or stall as necessary | |
| 592 } | |
| 593 assert(result == NULL || gch->is_in_reserved(result), | |
| 594 "result not in heap"); | |
| 595 return result; | |
| 596 } | |
| 597 | |
| 598 // Give a warning if we seem to be looping forever. | |
| 599 if ((QueuedAllocationWarningCount > 0) && | |
| 600 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 601 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
| 602 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
| 603 } | |
| 604 } | |
| 605 } | |
| 606 | |
| 607 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
| 608 bool is_tlab) { | |
| 609 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 610 HeapWord* result = NULL; | |
| 611 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
| 612 Generation *gen = gch->get_gen(i); | |
| 613 if (gen->should_allocate(size, is_tlab)) { | |
| 614 result = gen->expand_and_allocate(size, is_tlab); | |
| 615 } | |
| 616 } | |
| 617 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
| 618 return result; | |
| 619 } | |
| 620 | |
| 621 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 622 bool is_tlab) { | |
| 623 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
| 624 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
| 625 HeapWord* result = NULL; | |
| 626 | |
| 627 assert(size != 0, "Precondition violated"); | |
| 628 if (GC_locker::is_active_and_needs_gc()) { | |
| 629 // GC locker is active; instead of a collection we will attempt | |
| 630 // to expand the heap, if there's room for expansion. | |
| 631 if (!gch->is_maximal_no_gc()) { | |
| 632 result = expand_heap_and_allocate(size, is_tlab); | |
| 633 } | |
| 634 return result; // could be null if we are out of space | |
| 635 } else if (!gch->incremental_collection_will_fail()) { | |
| 636 // The gc_prologues have not executed yet. The value | |
| 637 // for incremental_collection_will_fail() is the remanent | |
| 638 // of the last collection. | |
| 639 // Do an incremental collection. | |
| 640 gch->do_collection(false /* full */, | |
| 641 false /* clear_all_soft_refs */, | |
| 642 size /* size */, | |
| 643 is_tlab /* is_tlab */, | |
| 644 number_of_generations() - 1 /* max_level */); | |
| 645 } else { | |
| 646 // Try a full collection; see delta for bug id 6266275 | |
| 647 // for the original code and why this has been simplified | |
| 648 // with from-space allocation criteria modified and | |
| 649 // such allocation moved out of the safepoint path. | |
| 650 gch->do_collection(true /* full */, | |
| 651 false /* clear_all_soft_refs */, | |
| 652 size /* size */, | |
| 653 is_tlab /* is_tlab */, | |
| 654 number_of_generations() - 1 /* max_level */); | |
| 655 } | |
| 656 | |
| 657 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
| 658 | |
| 659 if (result != NULL) { | |
| 660 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 661 return result; | |
| 662 } | |
| 663 | |
| 664 // OK, collection failed, try expansion. | |
| 665 result = expand_heap_and_allocate(size, is_tlab); | |
| 666 if (result != NULL) { | |
| 667 return result; | |
| 668 } | |
| 669 | |
| 670 // If we reach this point, we're really out of memory. Try every trick | |
| 671 // we can to reclaim memory. Force collection of soft references. Force | |
| 672 // a complete compaction of the heap. Any additional methods for finding | |
| 673 // free memory should be here, especially if they are expensive. If this | |
| 674 // attempt fails, an OOM exception will be thrown. | |
| 675 { | |
| 676 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
| 677 | |
| 678 gch->do_collection(true /* full */, | |
| 679 true /* clear_all_soft_refs */, | |
| 680 size /* size */, | |
| 681 is_tlab /* is_tlab */, | |
| 682 number_of_generations() - 1 /* max_level */); | |
| 683 } | |
| 684 | |
| 685 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
| 686 if (result != NULL) { | |
| 687 assert(gch->is_in_reserved(result), "result not in heap"); | |
| 688 return result; | |
| 689 } | |
| 690 | |
| 691 // What else? We might try synchronous finalization later. If the total | |
| 692 // space available is large enough for the allocation, then a more | |
| 693 // complete compaction phase than we've tried so far might be | |
| 694 // appropriate. | |
| 695 return NULL; | |
| 696 } | |
| 697 | |
| 698 size_t GenCollectorPolicy::large_typearray_limit() { | |
| 699 return FastAllocateSizeLimit; | |
| 700 } | |
| 701 | |
| 702 // Return true if any of the following is true: | |
| 703 // . the allocation won't fit into the current young gen heap | |
| 704 // . gc locker is occupied (jni critical section) | |
| 705 // . heap memory is tight -- the most recent previous collection | |
| 706 // was a full collection because a partial collection (would | |
| 707 // have) failed and is likely to fail again | |
| 708 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
| 709 size_t word_size) const { | |
| 710 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 711 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
| 712 return (word_size > heap_word_size(gen0_capacity)) | |
| 713 || (GC_locker::is_active_and_needs_gc()) | |
| 714 || ( gch->last_incremental_collection_failed() | |
| 715 && gch->incremental_collection_will_fail()); | |
| 716 } | |
| 717 | |
| 718 | |
| 719 // | |
| 720 // MarkSweepPolicy methods | |
| 721 // | |
| 722 | |
| 723 MarkSweepPolicy::MarkSweepPolicy() { | |
| 724 initialize_all(); | |
| 725 } | |
| 726 | |
| 727 void MarkSweepPolicy::initialize_generations() { | |
| 728 initialize_perm_generation(PermGen::MarkSweepCompact); | |
| 729 _generations = new GenerationSpecPtr[number_of_generations()]; | |
| 730 if (_generations == NULL) | |
| 731 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 732 | |
| 733 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 734 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
| 735 } else { | |
| 736 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
| 737 } | |
| 738 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
| 739 | |
| 740 if (_generations[0] == NULL || _generations[1] == NULL) | |
| 741 vm_exit_during_initialization("Unable to allocate gen spec"); | |
| 742 } | |
| 743 | |
| 744 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
| 745 // initialize the policy counters - 2 collectors, 3 generations | |
| 746 if (UseParNewGC && ParallelGCThreads > 0) { | |
| 747 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
| 748 } | |
| 749 else { | |
| 750 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
| 751 } | |
| 752 } |