Tue, 07 Oct 2008 11:01:35 -0700
Merge
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_adjoiningGenerations.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | // If boundary moving is being used, create the young gen and old |
duke@435 | 29 | // gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to |
duke@435 | 30 | // the old behavior otherwise (with PSYoungGen and PSOldGen). |
duke@435 | 31 | |
duke@435 | 32 | AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, |
duke@435 | 33 | size_t init_low_byte_size, |
duke@435 | 34 | size_t min_low_byte_size, |
duke@435 | 35 | size_t max_low_byte_size, |
duke@435 | 36 | size_t init_high_byte_size, |
duke@435 | 37 | size_t min_high_byte_size, |
duke@435 | 38 | size_t max_high_byte_size, |
duke@435 | 39 | size_t alignment) : |
duke@435 | 40 | _virtual_spaces(old_young_rs, min_low_byte_size, |
duke@435 | 41 | min_high_byte_size, alignment) { |
duke@435 | 42 | assert(min_low_byte_size <= init_low_byte_size && |
duke@435 | 43 | init_low_byte_size <= max_low_byte_size, "Parameter check"); |
duke@435 | 44 | assert(min_high_byte_size <= init_high_byte_size && |
duke@435 | 45 | init_high_byte_size <= max_high_byte_size, "Parameter check"); |
duke@435 | 46 | // Create the generations differently based on the option to |
duke@435 | 47 | // move the boundary. |
duke@435 | 48 | if (UseAdaptiveGCBoundary) { |
duke@435 | 49 | // Initialize the adjoining virtual spaces. Then pass the |
duke@435 | 50 | // a virtual to each generation for initialization of the |
duke@435 | 51 | // generation. |
duke@435 | 52 | |
duke@435 | 53 | // Does the actual creation of the virtual spaces |
duke@435 | 54 | _virtual_spaces.initialize(max_low_byte_size, |
duke@435 | 55 | init_low_byte_size, |
duke@435 | 56 | init_high_byte_size); |
duke@435 | 57 | |
duke@435 | 58 | // Place the young gen at the high end. Passes in the virtual space. |
duke@435 | 59 | _young_gen = new ASPSYoungGen(_virtual_spaces.high(), |
duke@435 | 60 | _virtual_spaces.high()->committed_size(), |
duke@435 | 61 | min_high_byte_size, |
duke@435 | 62 | _virtual_spaces.high_byte_size_limit()); |
duke@435 | 63 | |
duke@435 | 64 | // Place the old gen at the low end. Passes in the virtual space. |
duke@435 | 65 | _old_gen = new ASPSOldGen(_virtual_spaces.low(), |
duke@435 | 66 | _virtual_spaces.low()->committed_size(), |
duke@435 | 67 | min_low_byte_size, |
duke@435 | 68 | _virtual_spaces.low_byte_size_limit(), |
duke@435 | 69 | "old", 1); |
duke@435 | 70 | |
duke@435 | 71 | young_gen()->initialize_work(); |
duke@435 | 72 | assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), |
duke@435 | 73 | "Consistency check"); |
duke@435 | 74 | assert(old_young_rs.size() >= young_gen()->gen_size_limit(), |
duke@435 | 75 | "Consistency check"); |
duke@435 | 76 | |
duke@435 | 77 | old_gen()->initialize_work("old", 1); |
duke@435 | 78 | assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), |
duke@435 | 79 | "Consistency check"); |
duke@435 | 80 | assert(old_young_rs.size() >= old_gen()->gen_size_limit(), |
duke@435 | 81 | "Consistency check"); |
duke@435 | 82 | } else { |
duke@435 | 83 | |
duke@435 | 84 | // Layout the reserved space for the generations. |
duke@435 | 85 | ReservedSpace old_rs = |
duke@435 | 86 | virtual_spaces()->reserved_space().first_part(max_low_byte_size); |
duke@435 | 87 | ReservedSpace heap_rs = |
duke@435 | 88 | virtual_spaces()->reserved_space().last_part(max_low_byte_size); |
duke@435 | 89 | ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); |
duke@435 | 90 | assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); |
duke@435 | 91 | |
duke@435 | 92 | // Create the generations. Virtual spaces are not passed in. |
duke@435 | 93 | _young_gen = new PSYoungGen(init_high_byte_size, |
duke@435 | 94 | min_high_byte_size, |
duke@435 | 95 | max_high_byte_size); |
duke@435 | 96 | _old_gen = new PSOldGen(init_low_byte_size, |
duke@435 | 97 | min_low_byte_size, |
duke@435 | 98 | max_low_byte_size, |
duke@435 | 99 | "old", 1); |
duke@435 | 100 | |
duke@435 | 101 | // The virtual spaces are created by the initialization of the gens. |
duke@435 | 102 | _young_gen->initialize(young_rs, alignment); |
duke@435 | 103 | assert(young_gen()->gen_size_limit() == young_rs.size(), |
duke@435 | 104 | "Consistency check"); |
duke@435 | 105 | _old_gen->initialize(old_rs, alignment, "old", 1); |
duke@435 | 106 | assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); |
duke@435 | 107 | } |
duke@435 | 108 | } |
duke@435 | 109 | |
duke@435 | 110 | size_t AdjoiningGenerations::reserved_byte_size() { |
duke@435 | 111 | return virtual_spaces()->reserved_space().size(); |
duke@435 | 112 | } |
duke@435 | 113 | |
duke@435 | 114 | |
duke@435 | 115 | // Make checks on the current sizes of the generations and |
duke@435 | 116 | // the contraints on the sizes of the generations. Push |
duke@435 | 117 | // up the boundary within the contraints. A partial |
duke@435 | 118 | // push can occur. |
duke@435 | 119 | void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { |
duke@435 | 120 | assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
duke@435 | 121 | |
duke@435 | 122 | assert_lock_strong(ExpandHeap_lock); |
duke@435 | 123 | assert_locked_or_safepoint(Heap_lock); |
duke@435 | 124 | |
duke@435 | 125 | // These sizes limit the amount the boundaries can move. Effectively, |
duke@435 | 126 | // the generation says how much it is willing to yield to the other |
duke@435 | 127 | // generation. |
duke@435 | 128 | const size_t young_gen_available = young_gen()->available_for_contraction(); |
duke@435 | 129 | const size_t old_gen_available = old_gen()->available_for_expansion(); |
duke@435 | 130 | const size_t alignment = virtual_spaces()->alignment(); |
duke@435 | 131 | size_t change_in_bytes = MIN3(young_gen_available, |
duke@435 | 132 | old_gen_available, |
duke@435 | 133 | align_size_up_(expand_in_bytes, alignment)); |
duke@435 | 134 | |
duke@435 | 135 | if (change_in_bytes == 0) { |
duke@435 | 136 | return; |
duke@435 | 137 | } |
duke@435 | 138 | |
duke@435 | 139 | if (TraceAdaptiveGCBoundary) { |
duke@435 | 140 | gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); |
duke@435 | 141 | gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", |
duke@435 | 142 | expand_in_bytes, change_in_bytes); |
duke@435 | 143 | if (!PrintHeapAtGC) { |
duke@435 | 144 | Universe::print_on(gclog_or_tty); |
duke@435 | 145 | } |
duke@435 | 146 | gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", |
duke@435 | 147 | old_gen()->max_gen_size()/K); |
duke@435 | 148 | } |
duke@435 | 149 | |
duke@435 | 150 | // Move the boundary between the generations up (smaller young gen). |
duke@435 | 151 | if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { |
duke@435 | 152 | young_gen()->reset_after_change(); |
duke@435 | 153 | old_gen()->reset_after_change(); |
duke@435 | 154 | } |
duke@435 | 155 | |
duke@435 | 156 | // The total reserved for the generations should match the sum |
duke@435 | 157 | // of the two even if the boundary is moving. |
duke@435 | 158 | assert(reserved_byte_size() == |
duke@435 | 159 | old_gen()->max_gen_size() + young_gen()->max_size(), |
duke@435 | 160 | "Space is missing"); |
duke@435 | 161 | young_gen()->space_invariants(); |
duke@435 | 162 | old_gen()->space_invariants(); |
duke@435 | 163 | |
duke@435 | 164 | if (TraceAdaptiveGCBoundary) { |
duke@435 | 165 | gclog_or_tty->print_cr("After expansion of old gen with boundary move"); |
duke@435 | 166 | if (!PrintHeapAtGC) { |
duke@435 | 167 | Universe::print_on(gclog_or_tty); |
duke@435 | 168 | } |
duke@435 | 169 | gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", |
duke@435 | 170 | old_gen()->max_gen_size()/K); |
duke@435 | 171 | } |
duke@435 | 172 | } |
duke@435 | 173 | |
duke@435 | 174 | // See comments on request_old_gen_expansion() |
duke@435 | 175 | bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { |
duke@435 | 176 | assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
duke@435 | 177 | |
duke@435 | 178 | // If eden is not empty, the boundary can be moved but no advantage |
duke@435 | 179 | // can be made of the move since eden cannot be moved. |
duke@435 | 180 | if (!young_gen()->eden_space()->is_empty()) { |
duke@435 | 181 | return false; |
duke@435 | 182 | } |
duke@435 | 183 | |
duke@435 | 184 | |
duke@435 | 185 | bool result = false; |
duke@435 | 186 | const size_t young_gen_available = young_gen()->available_for_expansion(); |
duke@435 | 187 | const size_t old_gen_available = old_gen()->available_for_contraction(); |
duke@435 | 188 | const size_t alignment = virtual_spaces()->alignment(); |
duke@435 | 189 | size_t change_in_bytes = MIN3(young_gen_available, |
duke@435 | 190 | old_gen_available, |
duke@435 | 191 | align_size_up_(expand_in_bytes, alignment)); |
duke@435 | 192 | |
duke@435 | 193 | if (change_in_bytes == 0) { |
duke@435 | 194 | return false; |
duke@435 | 195 | } |
duke@435 | 196 | |
duke@435 | 197 | if (TraceAdaptiveGCBoundary) { |
duke@435 | 198 | gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); |
duke@435 | 199 | gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", |
duke@435 | 200 | expand_in_bytes, change_in_bytes); |
duke@435 | 201 | if (!PrintHeapAtGC) { |
duke@435 | 202 | Universe::print_on(gclog_or_tty); |
duke@435 | 203 | } |
duke@435 | 204 | gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", |
duke@435 | 205 | young_gen()->max_size()/K); |
duke@435 | 206 | } |
duke@435 | 207 | |
duke@435 | 208 | // Move the boundary between the generations down (smaller old gen). |
duke@435 | 209 | MutexLocker x(ExpandHeap_lock); |
duke@435 | 210 | if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { |
duke@435 | 211 | young_gen()->reset_after_change(); |
duke@435 | 212 | old_gen()->reset_after_change(); |
duke@435 | 213 | result = true; |
duke@435 | 214 | } |
duke@435 | 215 | |
duke@435 | 216 | // The total reserved for the generations should match the sum |
duke@435 | 217 | // of the two even if the boundary is moving. |
duke@435 | 218 | assert(reserved_byte_size() == |
duke@435 | 219 | old_gen()->max_gen_size() + young_gen()->max_size(), |
duke@435 | 220 | "Space is missing"); |
duke@435 | 221 | young_gen()->space_invariants(); |
duke@435 | 222 | old_gen()->space_invariants(); |
duke@435 | 223 | |
duke@435 | 224 | if (TraceAdaptiveGCBoundary) { |
duke@435 | 225 | gclog_or_tty->print_cr("After expansion of young gen with boundary move"); |
duke@435 | 226 | if (!PrintHeapAtGC) { |
duke@435 | 227 | Universe::print_on(gclog_or_tty); |
duke@435 | 228 | } |
duke@435 | 229 | gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", |
duke@435 | 230 | young_gen()->max_size()/K); |
duke@435 | 231 | } |
duke@435 | 232 | |
duke@435 | 233 | return result; |
duke@435 | 234 | } |
duke@435 | 235 | |
duke@435 | 236 | // Additional space is needed in the old generation. Try to move the boundary |
duke@435 | 237 | // up to meet the need. Moves boundary up only |
duke@435 | 238 | void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( |
duke@435 | 239 | size_t desired_free_space) { |
duke@435 | 240 | assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
duke@435 | 241 | |
duke@435 | 242 | // Stress testing. |
duke@435 | 243 | if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { |
duke@435 | 244 | MutexLocker x(ExpandHeap_lock); |
duke@435 | 245 | request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); |
duke@435 | 246 | } |
duke@435 | 247 | |
duke@435 | 248 | // Expand only if the entire generation is already committed. |
duke@435 | 249 | if (old_gen()->virtual_space()->uncommitted_size() == 0) { |
duke@435 | 250 | if (old_gen()->free_in_bytes() < desired_free_space) { |
duke@435 | 251 | MutexLocker x(ExpandHeap_lock); |
duke@435 | 252 | request_old_gen_expansion(desired_free_space); |
duke@435 | 253 | } |
duke@435 | 254 | } |
duke@435 | 255 | } |
duke@435 | 256 | |
duke@435 | 257 | // See comment on adjust_boundary_for_old_gen_needss(). |
duke@435 | 258 | // Adjust boundary down only. |
duke@435 | 259 | void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, |
duke@435 | 260 | size_t survivor_size) { |
duke@435 | 261 | |
duke@435 | 262 | assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
duke@435 | 263 | |
duke@435 | 264 | // Stress testing. |
duke@435 | 265 | if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { |
duke@435 | 266 | request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); |
duke@435 | 267 | eden_size = young_gen()->eden_space()->capacity_in_bytes(); |
duke@435 | 268 | } |
duke@435 | 269 | |
duke@435 | 270 | // Expand only if the entire generation is already committed. |
duke@435 | 271 | if (young_gen()->virtual_space()->uncommitted_size() == 0) { |
duke@435 | 272 | size_t desired_size = eden_size + 2 * survivor_size; |
duke@435 | 273 | const size_t committed = young_gen()->virtual_space()->committed_size(); |
duke@435 | 274 | if (desired_size > committed) { |
duke@435 | 275 | request_young_gen_expansion(desired_size - committed); |
duke@435 | 276 | } |
duke@435 | 277 | } |
duke@435 | 278 | } |