Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | f95d63e2154a |
| children | 8f07aa079343 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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2 * Copyright (c) 2003, 2012, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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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" | |
| 28 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 0 | 29 |
| 30 // If boundary moving is being used, create the young gen and old | |
| 31 // gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to | |
| 32 // the old behavior otherwise (with PSYoungGen and PSOldGen). | |
| 33 | |
| 34 AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, | |
| 35 size_t init_low_byte_size, | |
| 36 size_t min_low_byte_size, | |
| 37 size_t max_low_byte_size, | |
| 38 size_t init_high_byte_size, | |
| 39 size_t min_high_byte_size, | |
| 40 size_t max_high_byte_size, | |
| 41 size_t alignment) : | |
| 42 _virtual_spaces(old_young_rs, min_low_byte_size, | |
| 43 min_high_byte_size, alignment) { | |
| 44 assert(min_low_byte_size <= init_low_byte_size && | |
| 45 init_low_byte_size <= max_low_byte_size, "Parameter check"); | |
| 46 assert(min_high_byte_size <= init_high_byte_size && | |
| 47 init_high_byte_size <= max_high_byte_size, "Parameter check"); | |
| 48 // Create the generations differently based on the option to | |
| 49 // move the boundary. | |
| 50 if (UseAdaptiveGCBoundary) { | |
| 51 // Initialize the adjoining virtual spaces. Then pass the | |
| 52 // a virtual to each generation for initialization of the | |
| 53 // generation. | |
| 54 | |
| 55 // Does the actual creation of the virtual spaces | |
| 56 _virtual_spaces.initialize(max_low_byte_size, | |
| 57 init_low_byte_size, | |
| 58 init_high_byte_size); | |
| 59 | |
| 60 // Place the young gen at the high end. Passes in the virtual space. | |
| 61 _young_gen = new ASPSYoungGen(_virtual_spaces.high(), | |
| 62 _virtual_spaces.high()->committed_size(), | |
| 63 min_high_byte_size, | |
| 64 _virtual_spaces.high_byte_size_limit()); | |
| 65 | |
| 66 // Place the old gen at the low end. Passes in the virtual space. | |
| 67 _old_gen = new ASPSOldGen(_virtual_spaces.low(), | |
| 68 _virtual_spaces.low()->committed_size(), | |
| 69 min_low_byte_size, | |
| 70 _virtual_spaces.low_byte_size_limit(), | |
| 71 "old", 1); | |
| 72 | |
| 73 young_gen()->initialize_work(); | |
| 74 assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), | |
| 75 "Consistency check"); | |
| 76 assert(old_young_rs.size() >= young_gen()->gen_size_limit(), | |
| 77 "Consistency check"); | |
| 78 | |
| 79 old_gen()->initialize_work("old", 1); | |
| 80 assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), | |
| 81 "Consistency check"); | |
| 82 assert(old_young_rs.size() >= old_gen()->gen_size_limit(), | |
| 83 "Consistency check"); | |
| 84 } else { | |
| 85 | |
| 86 // Layout the reserved space for the generations. | |
| 87 ReservedSpace old_rs = | |
| 88 virtual_spaces()->reserved_space().first_part(max_low_byte_size); | |
| 89 ReservedSpace heap_rs = | |
| 90 virtual_spaces()->reserved_space().last_part(max_low_byte_size); | |
| 91 ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); | |
| 92 assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); | |
| 93 | |
| 94 // Create the generations. Virtual spaces are not passed in. | |
| 95 _young_gen = new PSYoungGen(init_high_byte_size, | |
| 96 min_high_byte_size, | |
| 97 max_high_byte_size); | |
| 98 _old_gen = new PSOldGen(init_low_byte_size, | |
| 99 min_low_byte_size, | |
| 100 max_low_byte_size, | |
| 101 "old", 1); | |
| 102 | |
| 103 // The virtual spaces are created by the initialization of the gens. | |
| 104 _young_gen->initialize(young_rs, alignment); | |
| 105 assert(young_gen()->gen_size_limit() == young_rs.size(), | |
| 106 "Consistency check"); | |
| 107 _old_gen->initialize(old_rs, alignment, "old", 1); | |
| 108 assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 size_t AdjoiningGenerations::reserved_byte_size() { | |
| 113 return virtual_spaces()->reserved_space().size(); | |
| 114 } | |
| 115 | |
| 116 | |
| 117 // Make checks on the current sizes of the generations and | |
| 118 // the contraints on the sizes of the generations. Push | |
| 119 // up the boundary within the contraints. A partial | |
| 120 // push can occur. | |
| 121 void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { | |
| 122 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 123 | |
| 124 assert_lock_strong(ExpandHeap_lock); | |
| 125 assert_locked_or_safepoint(Heap_lock); | |
| 126 | |
| 127 // These sizes limit the amount the boundaries can move. Effectively, | |
| 128 // the generation says how much it is willing to yield to the other | |
| 129 // generation. | |
| 130 const size_t young_gen_available = young_gen()->available_for_contraction(); | |
| 131 const size_t old_gen_available = old_gen()->available_for_expansion(); | |
| 132 const size_t alignment = virtual_spaces()->alignment(); | |
| 133 size_t change_in_bytes = MIN3(young_gen_available, | |
| 134 old_gen_available, | |
| 135 align_size_up_(expand_in_bytes, alignment)); | |
| 136 | |
| 137 if (change_in_bytes == 0) { | |
| 138 return; | |
| 139 } | |
| 140 | |
| 141 if (TraceAdaptiveGCBoundary) { | |
| 142 gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); | |
| 143 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
| 144 expand_in_bytes, change_in_bytes); | |
| 145 if (!PrintHeapAtGC) { | |
| 146 Universe::print_on(gclog_or_tty); | |
| 147 } | |
| 148 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
| 149 old_gen()->max_gen_size()/K); | |
| 150 } | |
| 151 | |
| 152 // Move the boundary between the generations up (smaller young gen). | |
| 153 if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { | |
| 154 young_gen()->reset_after_change(); | |
| 155 old_gen()->reset_after_change(); | |
| 156 } | |
| 157 | |
| 158 // The total reserved for the generations should match the sum | |
| 159 // of the two even if the boundary is moving. | |
| 160 assert(reserved_byte_size() == | |
| 161 old_gen()->max_gen_size() + young_gen()->max_size(), | |
| 162 "Space is missing"); | |
| 163 young_gen()->space_invariants(); | |
| 164 old_gen()->space_invariants(); | |
| 165 | |
| 166 if (TraceAdaptiveGCBoundary) { | |
| 167 gclog_or_tty->print_cr("After expansion of old gen with boundary move"); | |
| 168 if (!PrintHeapAtGC) { | |
| 169 Universe::print_on(gclog_or_tty); | |
| 170 } | |
| 171 gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", | |
| 172 old_gen()->max_gen_size()/K); | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 // See comments on request_old_gen_expansion() | |
| 177 bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { | |
| 178 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 179 | |
| 180 // If eden is not empty, the boundary can be moved but no advantage | |
| 181 // can be made of the move since eden cannot be moved. | |
| 182 if (!young_gen()->eden_space()->is_empty()) { | |
| 183 return false; | |
| 184 } | |
| 185 | |
| 186 | |
| 187 bool result = false; | |
| 188 const size_t young_gen_available = young_gen()->available_for_expansion(); | |
| 189 const size_t old_gen_available = old_gen()->available_for_contraction(); | |
| 190 const size_t alignment = virtual_spaces()->alignment(); | |
| 191 size_t change_in_bytes = MIN3(young_gen_available, | |
| 192 old_gen_available, | |
| 193 align_size_up_(expand_in_bytes, alignment)); | |
| 194 | |
| 195 if (change_in_bytes == 0) { | |
| 196 return false; | |
| 197 } | |
| 198 | |
| 199 if (TraceAdaptiveGCBoundary) { | |
| 200 gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); | |
| 201 gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", | |
| 202 expand_in_bytes, change_in_bytes); | |
| 203 if (!PrintHeapAtGC) { | |
| 204 Universe::print_on(gclog_or_tty); | |
| 205 } | |
| 206 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
| 207 young_gen()->max_size()/K); | |
| 208 } | |
| 209 | |
| 210 // Move the boundary between the generations down (smaller old gen). | |
| 211 MutexLocker x(ExpandHeap_lock); | |
| 212 if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { | |
| 213 young_gen()->reset_after_change(); | |
| 214 old_gen()->reset_after_change(); | |
| 215 result = true; | |
| 216 } | |
| 217 | |
| 218 // The total reserved for the generations should match the sum | |
| 219 // of the two even if the boundary is moving. | |
| 220 assert(reserved_byte_size() == | |
| 221 old_gen()->max_gen_size() + young_gen()->max_size(), | |
| 222 "Space is missing"); | |
| 223 young_gen()->space_invariants(); | |
| 224 old_gen()->space_invariants(); | |
| 225 | |
| 226 if (TraceAdaptiveGCBoundary) { | |
| 227 gclog_or_tty->print_cr("After expansion of young gen with boundary move"); | |
| 228 if (!PrintHeapAtGC) { | |
| 229 Universe::print_on(gclog_or_tty); | |
| 230 } | |
| 231 gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", | |
| 232 young_gen()->max_size()/K); | |
| 233 } | |
| 234 | |
| 235 return result; | |
| 236 } | |
| 237 | |
| 238 // Additional space is needed in the old generation. Try to move the boundary | |
| 239 // up to meet the need. Moves boundary up only | |
| 240 void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( | |
| 241 size_t desired_free_space) { | |
| 242 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 243 | |
| 244 // Stress testing. | |
| 245 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { | |
| 246 MutexLocker x(ExpandHeap_lock); | |
| 247 request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
| 248 } | |
| 249 | |
| 250 // Expand only if the entire generation is already committed. | |
| 251 if (old_gen()->virtual_space()->uncommitted_size() == 0) { | |
| 252 if (old_gen()->free_in_bytes() < desired_free_space) { | |
| 253 MutexLocker x(ExpandHeap_lock); | |
| 254 request_old_gen_expansion(desired_free_space); | |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 // See comment on adjust_boundary_for_old_gen_needss(). | |
| 260 // Adjust boundary down only. | |
| 261 void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, | |
| 262 size_t survivor_size) { | |
| 263 | |
| 264 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); | |
| 265 | |
| 266 // Stress testing. | |
| 267 if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { | |
| 268 request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); | |
| 269 eden_size = young_gen()->eden_space()->capacity_in_bytes(); | |
| 270 } | |
| 271 | |
| 272 // Expand only if the entire generation is already committed. | |
| 273 if (young_gen()->virtual_space()->uncommitted_size() == 0) { | |
| 274 size_t desired_size = eden_size + 2 * survivor_size; | |
| 275 const size_t committed = young_gen()->virtual_space()->committed_size(); | |
| 276 if (desired_size > committed) { | |
| 277 request_young_gen_expansion(desired_size - committed); | |
| 278 } | |
| 279 } | |
| 280 } |