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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
| author | mikael |
|---|---|
| date | Tue, 24 Dec 2013 11:48:39 -0800 |
| parents | 8f07aa079343 |
| children | 63a4eb8bcd23 78bbf4d43a14 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/adjoiningGenerations.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
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28 #include "gc_implementation/parallelScavenge/generationSizer.hpp" |
| 1972 | 29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
| 0 | 30 |
| 31 // If boundary moving is being used, create the young gen and old | |
| 32 // gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to | |
| 33 // the old behavior otherwise (with PSYoungGen and PSOldGen). | |
| 34 | |
| 35 AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, | |
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36 GenerationSizer* policy, |
| 0 | 37 size_t alignment) : |
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38 _virtual_spaces(old_young_rs, policy->min_gen1_size(), |
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39 policy->min_gen0_size(), alignment) { |
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40 size_t init_low_byte_size = policy->initial_gen1_size(); |
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41 size_t min_low_byte_size = policy->min_gen1_size(); |
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42 size_t max_low_byte_size = policy->max_gen1_size(); |
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43 size_t init_high_byte_size = policy->initial_gen0_size(); |
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44 size_t min_high_byte_size = policy->min_gen0_size(); |
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45 size_t max_high_byte_size = policy->max_gen0_size(); |
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46 |
| 0 | 47 assert(min_low_byte_size <= init_low_byte_size && |
| 48 init_low_byte_size <= max_low_byte_size, "Parameter check"); | |
| 49 assert(min_high_byte_size <= init_high_byte_size && | |
| 50 init_high_byte_size <= max_high_byte_size, "Parameter check"); | |
| 51 // Create the generations differently based on the option to | |
| 52 // move the boundary. | |
| 53 if (UseAdaptiveGCBoundary) { | |
| 54 // Initialize the adjoining virtual spaces. Then pass the | |
| 55 // a virtual to each generation for initialization of the | |
| 56 // generation. | |
| 57 | |
| 58 // Does the actual creation of the virtual spaces | |
| 59 _virtual_spaces.initialize(max_low_byte_size, | |
| 60 init_low_byte_size, | |
| 61 init_high_byte_size); | |
| 62 | |
| 63 // Place the young gen at the high end. Passes in the virtual space. | |
| 64 _young_gen = new ASPSYoungGen(_virtual_spaces.high(), | |
| 65 _virtual_spaces.high()->committed_size(), | |
| 66 min_high_byte_size, | |
| 67 _virtual_spaces.high_byte_size_limit()); | |
| 68 | |
| 69 // Place the old gen at the low end. Passes in the virtual space. | |
| 70 _old_gen = new ASPSOldGen(_virtual_spaces.low(), | |
| 71 _virtual_spaces.low()->committed_size(), | |
| 72 min_low_byte_size, | |
| 73 _virtual_spaces.low_byte_size_limit(), | |
| 74 "old", 1); | |
| 75 | |
| 76 young_gen()->initialize_work(); | |
| 77 assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), | |
| 78 "Consistency check"); | |
| 79 assert(old_young_rs.size() >= young_gen()->gen_size_limit(), | |
| 80 "Consistency check"); | |
| 81 | |
| 82 old_gen()->initialize_work("old", 1); | |
| 83 assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), | |
| 84 "Consistency check"); | |
| 85 assert(old_young_rs.size() >= old_gen()->gen_size_limit(), | |
| 86 "Consistency check"); | |
| 87 } else { | |
| 88 | |
| 89 // Layout the reserved space for the generations. | |
| 90 ReservedSpace old_rs = | |
| 91 virtual_spaces()->reserved_space().first_part(max_low_byte_size); | |
| 92 ReservedSpace heap_rs = | |
| 93 virtual_spaces()->reserved_space().last_part(max_low_byte_size); | |
| 94 ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); | |
| 95 assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); | |
| 96 | |
| 97 // Create the generations. Virtual spaces are not passed in. | |
| 98 _young_gen = new PSYoungGen(init_high_byte_size, | |
| 99 min_high_byte_size, | |
| 100 max_high_byte_size); | |
| 101 _old_gen = new PSOldGen(init_low_byte_size, | |
| 102 min_low_byte_size, | |
| 103 max_low_byte_size, | |
| 104 "old", 1); | |
| 105 | |
| 106 // The virtual spaces are created by the initialization of the gens. | |
| 107 _young_gen->initialize(young_rs, alignment); | |
| 108 assert(young_gen()->gen_size_limit() == young_rs.size(), | |
| 109 "Consistency check"); | |
| 110 _old_gen->initialize(old_rs, alignment, "old", 1); | |
| 111 assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 size_t AdjoiningGenerations::reserved_byte_size() { | |
| 116 return virtual_spaces()->reserved_space().size(); | |
| 117 } | |
| 118 | |
| 119 | |
| 120 // Make checks on the current sizes of the generations and | |
| 121 // the contraints on the sizes of the generations. Push | |
| 122 // up the boundary within the contraints. A partial | |
| 123 // push can occur. | |
| 124 void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { | |
| 125 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 126 | |
| 127 assert_lock_strong(ExpandHeap_lock); | |
| 128 assert_locked_or_safepoint(Heap_lock); | |
| 129 | |
| 130 // These sizes limit the amount the boundaries can move. Effectively, | |
| 131 // the generation says how much it is willing to yield to the other | |
| 132 // generation. | |
| 133 const size_t young_gen_available = young_gen()->available_for_contraction(); | |
| 134 const size_t old_gen_available = old_gen()->available_for_expansion(); | |
| 135 const size_t alignment = virtual_spaces()->alignment(); | |
| 136 size_t change_in_bytes = MIN3(young_gen_available, | |
| 137 old_gen_available, | |
| 138 align_size_up_(expand_in_bytes, alignment)); | |
| 139 | |
| 140 if (change_in_bytes == 0) { | |
| 141 return; | |
| 142 } | |
| 143 | |
| 144 if (TraceAdaptiveGCBoundary) { | |
| 145 gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); | |
| 146 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
| 147 expand_in_bytes, change_in_bytes); | |
| 148 if (!PrintHeapAtGC) { | |
| 149 Universe::print_on(gclog_or_tty); | |
| 150 } | |
| 151 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
| 152 old_gen()->max_gen_size()/K); | |
| 153 } | |
| 154 | |
| 155 // Move the boundary between the generations up (smaller young gen). | |
| 156 if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { | |
| 157 young_gen()->reset_after_change(); | |
| 158 old_gen()->reset_after_change(); | |
| 159 } | |
| 160 | |
| 161 // The total reserved for the generations should match the sum | |
| 162 // of the two even if the boundary is moving. | |
| 163 assert(reserved_byte_size() == | |
| 164 old_gen()->max_gen_size() + young_gen()->max_size(), | |
| 165 "Space is missing"); | |
| 166 young_gen()->space_invariants(); | |
| 167 old_gen()->space_invariants(); | |
| 168 | |
| 169 if (TraceAdaptiveGCBoundary) { | |
| 170 gclog_or_tty->print_cr("After expansion of old gen with boundary move"); | |
| 171 if (!PrintHeapAtGC) { | |
| 172 Universe::print_on(gclog_or_tty); | |
| 173 } | |
| 174 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
| 175 old_gen()->max_gen_size()/K); | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 // See comments on request_old_gen_expansion() | |
| 180 bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { | |
| 181 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 182 | |
| 183 // If eden is not empty, the boundary can be moved but no advantage | |
| 184 // can be made of the move since eden cannot be moved. | |
| 185 if (!young_gen()->eden_space()->is_empty()) { | |
| 186 return false; | |
| 187 } | |
| 188 | |
| 189 | |
| 190 bool result = false; | |
| 191 const size_t young_gen_available = young_gen()->available_for_expansion(); | |
| 192 const size_t old_gen_available = old_gen()->available_for_contraction(); | |
| 193 const size_t alignment = virtual_spaces()->alignment(); | |
| 194 size_t change_in_bytes = MIN3(young_gen_available, | |
| 195 old_gen_available, | |
| 196 align_size_up_(expand_in_bytes, alignment)); | |
| 197 | |
| 198 if (change_in_bytes == 0) { | |
| 199 return false; | |
| 200 } | |
| 201 | |
| 202 if (TraceAdaptiveGCBoundary) { | |
| 203 gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); | |
| 204 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
| 205 expand_in_bytes, change_in_bytes); | |
| 206 if (!PrintHeapAtGC) { | |
| 207 Universe::print_on(gclog_or_tty); | |
| 208 } | |
| 209 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
| 210 young_gen()->max_size()/K); | |
| 211 } | |
| 212 | |
| 213 // Move the boundary between the generations down (smaller old gen). | |
| 214 MutexLocker x(ExpandHeap_lock); | |
| 215 if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { | |
| 216 young_gen()->reset_after_change(); | |
| 217 old_gen()->reset_after_change(); | |
| 218 result = true; | |
| 219 } | |
| 220 | |
| 221 // The total reserved for the generations should match the sum | |
| 222 // of the two even if the boundary is moving. | |
| 223 assert(reserved_byte_size() == | |
| 224 old_gen()->max_gen_size() + young_gen()->max_size(), | |
| 225 "Space is missing"); | |
| 226 young_gen()->space_invariants(); | |
| 227 old_gen()->space_invariants(); | |
| 228 | |
| 229 if (TraceAdaptiveGCBoundary) { | |
| 230 gclog_or_tty->print_cr("After expansion of young gen with boundary move"); | |
| 231 if (!PrintHeapAtGC) { | |
| 232 Universe::print_on(gclog_or_tty); | |
| 233 } | |
| 234 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
| 235 young_gen()->max_size()/K); | |
| 236 } | |
| 237 | |
| 238 return result; | |
| 239 } | |
| 240 | |
| 241 // Additional space is needed in the old generation. Try to move the boundary | |
| 242 // up to meet the need. Moves boundary up only | |
| 243 void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( | |
| 244 size_t desired_free_space) { | |
| 245 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 246 | |
| 247 // Stress testing. | |
| 248 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { | |
| 249 MutexLocker x(ExpandHeap_lock); | |
| 250 request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
| 251 } | |
| 252 | |
| 253 // Expand only if the entire generation is already committed. | |
| 254 if (old_gen()->virtual_space()->uncommitted_size() == 0) { | |
| 255 if (old_gen()->free_in_bytes() < desired_free_space) { | |
| 256 MutexLocker x(ExpandHeap_lock); | |
| 257 request_old_gen_expansion(desired_free_space); | |
| 258 } | |
| 259 } | |
| 260 } | |
| 261 | |
| 262 // See comment on adjust_boundary_for_old_gen_needss(). | |
| 263 // Adjust boundary down only. | |
| 264 void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, | |
| 265 size_t survivor_size) { | |
| 266 | |
| 267 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 268 | |
| 269 // Stress testing. | |
| 270 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { | |
| 271 request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
| 272 eden_size = young_gen()->eden_space()->capacity_in_bytes(); | |
| 273 } | |
| 274 | |
| 275 // Expand only if the entire generation is already committed. | |
| 276 if (young_gen()->virtual_space()->uncommitted_size() == 0) { | |
| 277 size_t desired_size = eden_size + 2 * survivor_size; | |
| 278 const size_t committed = young_gen()->virtual_space()->committed_size(); | |
| 279 if (desired_size > committed) { | |
| 280 request_young_gen_expansion(desired_size - committed); | |
| 281 } | |
| 282 } | |
| 283 } |