Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parNew/asParNewGeneration.cpp @ 14909:4ca6dc0799b6
Backout jdk9 merge
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Tue, 01 Apr 2014 13:57:07 +0200 |
| parents | 63a4eb8bcd23 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 2005, 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/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
| 27 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" | |
| 28 #include "gc_implementation/parNew/asParNewGeneration.hpp" | |
| 29 #include "gc_implementation/parNew/parNewGeneration.hpp" | |
| 30 #include "gc_implementation/shared/markSweep.inline.hpp" | |
| 31 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 32 #include "memory/defNewGeneration.inline.hpp" | |
| 33 #include "memory/referencePolicy.hpp" | |
| 34 #include "oops/markOop.inline.hpp" | |
| 35 #include "oops/oop.pcgc.inline.hpp" | |
| 0 | 36 |
| 37 ASParNewGeneration::ASParNewGeneration(ReservedSpace rs, | |
| 38 size_t initial_byte_size, | |
| 39 size_t min_byte_size, | |
| 40 int level) : | |
| 41 ParNewGeneration(rs, initial_byte_size, level), | |
| 42 _min_gen_size(min_byte_size) {} | |
| 43 | |
| 44 const char* ASParNewGeneration::name() const { | |
| 45 return "adaptive size par new generation"; | |
| 46 } | |
| 47 | |
| 48 void ASParNewGeneration::adjust_desired_tenuring_threshold() { | |
| 49 assert(UseAdaptiveSizePolicy, | |
| 50 "Should only be used with UseAdaptiveSizePolicy"); | |
| 51 } | |
| 52 | |
| 53 void ASParNewGeneration::resize(size_t eden_size, size_t survivor_size) { | |
| 54 // Resize the generation if needed. If the generation resize | |
| 55 // reports false, do not attempt to resize the spaces. | |
| 56 if (resize_generation(eden_size, survivor_size)) { | |
| 57 // Then we lay out the spaces inside the generation | |
| 58 resize_spaces(eden_size, survivor_size); | |
| 59 | |
| 60 space_invariants(); | |
| 61 | |
| 62 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 63 gclog_or_tty->print_cr("Young generation size: " | |
| 64 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
| 65 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
| 66 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
| 67 eden_size, survivor_size, used(), capacity(), | |
| 68 max_gen_size(), min_gen_size()); | |
| 69 } | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 size_t ASParNewGeneration::available_to_min_gen() { | |
| 74 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
| 75 return virtual_space()->committed_size() - min_gen_size(); | |
| 76 } | |
| 77 | |
| 78 // This method assumes that from-space has live data and that | |
| 79 // any shrinkage of the young gen is limited by location of | |
| 80 // from-space. | |
| 81 size_t ASParNewGeneration::available_to_live() const { | |
| 82 #undef SHRINKS_AT_END_OF_EDEN | |
| 83 #ifdef SHRINKS_AT_END_OF_EDEN | |
| 84 size_t delta_in_survivor = 0; | |
| 85 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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86 const size_t space_alignment = heap->intra_heap_alignment(); |
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87 const size_t gen_alignment = heap->object_heap_alignment(); |
| 0 | 88 |
| 89 MutableSpace* space_shrinking = NULL; | |
| 90 if (from_space()->end() > to_space()->end()) { | |
| 91 space_shrinking = from_space(); | |
| 92 } else { | |
| 93 space_shrinking = to_space(); | |
| 94 } | |
| 95 | |
| 96 // Include any space that is committed but not included in | |
| 97 // the survivor spaces. | |
| 98 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
| 99 "Survivor space beyond high end"); | |
| 100 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
| 101 space_shrinking->end(), sizeof(char)); | |
| 102 | |
| 103 if (space_shrinking->is_empty()) { | |
| 104 // Don't let the space shrink to 0 | |
| 105 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
| 106 "Space is too small"); | |
| 107 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
| 108 } else { | |
| 109 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
| 110 space_shrinking->top(), | |
| 111 sizeof(char)); | |
| 112 } | |
| 113 | |
| 114 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
| 115 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
| 116 return delta_in_bytes; | |
| 117 #else | |
| 118 // The only space available for shrinking is in to-space if it | |
| 119 // is above from-space. | |
| 120 if (to()->bottom() > from()->bottom()) { | |
| 121 const size_t alignment = os::vm_page_size(); | |
| 122 if (to()->capacity() < alignment) { | |
| 123 return 0; | |
| 124 } else { | |
| 125 return to()->capacity() - alignment; | |
| 126 } | |
| 127 } else { | |
| 128 return 0; | |
| 129 } | |
| 130 #endif | |
| 131 } | |
| 132 | |
| 133 // Return the number of bytes available for resizing down the young | |
| 134 // generation. This is the minimum of | |
| 135 // input "bytes" | |
| 136 // bytes to the minimum young gen size | |
| 137 // bytes to the size currently being used + some small extra | |
| 138 size_t ASParNewGeneration::limit_gen_shrink (size_t bytes) { | |
| 139 // Allow shrinkage into the current eden but keep eden large enough | |
| 140 // to maintain the minimum young gen size | |
| 141 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
| 142 return align_size_down(bytes, os::vm_page_size()); | |
| 143 } | |
| 144 | |
| 145 // Note that the the alignment used is the OS page size as | |
| 146 // opposed to an alignment associated with the virtual space | |
| 147 // (as is done in the ASPSYoungGen/ASPSOldGen) | |
| 148 bool ASParNewGeneration::resize_generation(size_t eden_size, | |
| 149 size_t survivor_size) { | |
| 150 const size_t alignment = os::vm_page_size(); | |
| 151 size_t orig_size = virtual_space()->committed_size(); | |
| 152 bool size_changed = false; | |
| 153 | |
| 154 // There used to be this guarantee there. | |
| 155 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
| 156 // Code below forces this requirement. In addition the desired eden | |
| 14909 | 157 // size and disired survivor sizes are desired goals and may |
| 0 | 158 // exceed the total generation size. |
| 159 | |
| 160 assert(min_gen_size() <= orig_size && orig_size <= max_gen_size(), | |
| 161 "just checking"); | |
| 162 | |
| 163 // Adjust new generation size | |
| 164 const size_t eden_plus_survivors = | |
| 165 align_size_up(eden_size + 2 * survivor_size, alignment); | |
| 166 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_gen_size()), | |
| 167 min_gen_size()); | |
| 168 assert(desired_size <= max_gen_size(), "just checking"); | |
| 169 | |
| 170 if (desired_size > orig_size) { | |
| 171 // Grow the generation | |
| 172 size_t change = desired_size - orig_size; | |
| 173 assert(change % alignment == 0, "just checking"); | |
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174 if (expand(change)) { |
| 0 | 175 return false; // Error if we fail to resize! |
| 176 } | |
| 177 size_changed = true; | |
| 178 } else if (desired_size < orig_size) { | |
| 179 size_t desired_change = orig_size - desired_size; | |
| 180 assert(desired_change % alignment == 0, "just checking"); | |
| 181 | |
| 182 desired_change = limit_gen_shrink(desired_change); | |
| 183 | |
| 184 if (desired_change > 0) { | |
| 185 virtual_space()->shrink_by(desired_change); | |
| 186 reset_survivors_after_shrink(); | |
| 187 | |
| 188 size_changed = true; | |
| 189 } | |
| 190 } else { | |
| 191 if (Verbose && PrintGC) { | |
| 192 if (orig_size == max_gen_size()) { | |
| 193 gclog_or_tty->print_cr("ASParNew generation size at maximum: " | |
| 194 SIZE_FORMAT "K", orig_size/K); | |
| 195 } else if (orig_size == min_gen_size()) { | |
| 196 gclog_or_tty->print_cr("ASParNew generation size at minium: " | |
| 197 SIZE_FORMAT "K", orig_size/K); | |
| 198 } | |
| 199 } | |
| 200 } | |
| 201 | |
| 202 if (size_changed) { | |
| 203 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
| 204 (HeapWord*)virtual_space()->high()); | |
| 205 GenCollectedHeap::heap()->barrier_set()->resize_covered_region(cmr); | |
| 206 | |
| 207 if (Verbose && PrintGC) { | |
| 208 size_t current_size = virtual_space()->committed_size(); | |
| 209 gclog_or_tty->print_cr("ASParNew generation size changed: " | |
| 210 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
| 211 orig_size/K, current_size/K); | |
| 212 } | |
| 213 } | |
| 214 | |
| 215 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
| 216 virtual_space()->committed_size() == max_gen_size(), "Sanity"); | |
| 217 | |
| 218 return true; | |
| 219 } | |
| 220 | |
| 221 void ASParNewGeneration::reset_survivors_after_shrink() { | |
| 222 | |
| 223 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 224 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
| 225 | |
| 226 if (from()->end() > to()->end()) { | |
| 227 assert(new_end >= from()->end(), "Shrinking past from-space"); | |
| 228 } else { | |
| 229 assert(new_end >= to()->bottom(), "Shrink was too large"); | |
| 230 // Was there a shrink of the survivor space? | |
| 231 if (new_end < to()->end()) { | |
| 232 MemRegion mr(to()->bottom(), new_end); | |
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233 to()->initialize(mr, |
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234 SpaceDecorator::DontClear, |
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235 SpaceDecorator::DontMangle); |
| 0 | 236 } |
| 237 } | |
| 238 } | |
| 239 void ASParNewGeneration::resize_spaces(size_t requested_eden_size, | |
| 240 size_t requested_survivor_size) { | |
| 241 assert(UseAdaptiveSizePolicy, "sanity check"); | |
| 242 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
| 243 "just checking"); | |
| 244 CollectedHeap* heap = Universe::heap(); | |
| 245 assert(heap->kind() == CollectedHeap::GenCollectedHeap, "Sanity"); | |
| 246 | |
| 247 | |
| 248 // We require eden and to space to be empty | |
| 249 if ((!eden()->is_empty()) || (!to()->is_empty())) { | |
| 250 return; | |
| 251 } | |
| 252 | |
| 253 size_t cur_eden_size = eden()->capacity(); | |
| 254 | |
| 255 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 256 gclog_or_tty->print_cr("ASParNew::resize_spaces(requested_eden_size: " | |
| 257 SIZE_FORMAT | |
| 258 ", requested_survivor_size: " SIZE_FORMAT ")", | |
| 259 requested_eden_size, requested_survivor_size); | |
| 260 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 261 SIZE_FORMAT, | |
| 262 eden()->bottom(), | |
| 263 eden()->end(), | |
| 264 pointer_delta(eden()->end(), | |
| 265 eden()->bottom(), | |
| 266 sizeof(char))); | |
| 267 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 268 SIZE_FORMAT, | |
| 269 from()->bottom(), | |
| 270 from()->end(), | |
| 271 pointer_delta(from()->end(), | |
| 272 from()->bottom(), | |
| 273 sizeof(char))); | |
| 274 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 275 SIZE_FORMAT, | |
| 276 to()->bottom(), | |
| 277 to()->end(), | |
| 278 pointer_delta( to()->end(), | |
| 279 to()->bottom(), | |
| 280 sizeof(char))); | |
| 281 } | |
| 282 | |
| 283 // There's nothing to do if the new sizes are the same as the current | |
| 284 if (requested_survivor_size == to()->capacity() && | |
| 285 requested_survivor_size == from()->capacity() && | |
| 286 requested_eden_size == eden()->capacity()) { | |
| 287 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 288 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
| 289 } | |
| 290 return; | |
| 291 } | |
| 292 | |
| 293 char* eden_start = (char*)eden()->bottom(); | |
| 294 char* eden_end = (char*)eden()->end(); | |
| 295 char* from_start = (char*)from()->bottom(); | |
| 296 char* from_end = (char*)from()->end(); | |
| 297 char* to_start = (char*)to()->bottom(); | |
| 298 char* to_end = (char*)to()->end(); | |
| 299 | |
| 300 const size_t alignment = os::vm_page_size(); | |
| 301 const bool maintain_minimum = | |
| 302 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
| 303 | |
| 304 // Check whether from space is below to space | |
| 305 if (from_start < to_start) { | |
| 306 // Eden, from, to | |
| 307 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 308 gclog_or_tty->print_cr(" Eden, from, to:"); | |
| 309 } | |
| 310 | |
| 311 // Set eden | |
| 312 // "requested_eden_size" is a goal for the size of eden | |
| 313 // and may not be attainable. "eden_size" below is | |
| 314 // calculated based on the location of from-space and | |
| 315 // the goal for the size of eden. from-space is | |
| 316 // fixed in place because it contains live data. | |
| 317 // The calculation is done this way to avoid 32bit | |
| 318 // overflow (i.e., eden_start + requested_eden_size | |
| 319 // may too large for representation in 32bits). | |
| 320 size_t eden_size; | |
| 321 if (maintain_minimum) { | |
| 322 // Only make eden larger than the requested size if | |
| 323 // the minimum size of the generation has to be maintained. | |
| 324 // This could be done in general but policy at a higher | |
| 325 // level is determining a requested size for eden and that | |
| 326 // should be honored unless there is a fundamental reason. | |
| 327 eden_size = pointer_delta(from_start, | |
| 328 eden_start, | |
| 329 sizeof(char)); | |
| 330 } else { | |
| 331 eden_size = MIN2(requested_eden_size, | |
| 332 pointer_delta(from_start, eden_start, sizeof(char))); | |
| 333 } | |
| 334 | |
| 335 eden_size = align_size_down(eden_size, alignment); | |
| 336 eden_end = eden_start + eden_size; | |
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337 assert(eden_end >= eden_start, "addition overflowed"); |
| 0 | 338 |
| 339 // To may resize into from space as long as it is clear of live data. | |
| 340 // From space must remain page aligned, though, so we need to do some | |
| 341 // extra calculations. | |
| 342 | |
| 343 // First calculate an optimal to-space | |
| 344 to_end = (char*)virtual_space()->high(); | |
| 345 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
| 346 sizeof(char)); | |
| 347 | |
| 348 // Does the optimal to-space overlap from-space? | |
| 349 if (to_start < (char*)from()->end()) { | |
| 350 // Calculate the minimum offset possible for from_end | |
| 351 size_t from_size = pointer_delta(from()->top(), from_start, sizeof(char)); | |
| 352 | |
| 353 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
| 354 if (from_size == 0) { | |
| 355 from_size = alignment; | |
| 356 } else { | |
| 357 from_size = align_size_up(from_size, alignment); | |
| 358 } | |
| 359 | |
| 360 from_end = from_start + from_size; | |
| 361 assert(from_end > from_start, "addition overflow or from_size problem"); | |
| 362 | |
| 363 guarantee(from_end <= (char*)from()->end(), "from_end moved to the right"); | |
| 364 | |
| 365 // Now update to_start with the new from_end | |
| 366 to_start = MAX2(from_end, to_start); | |
| 367 } else { | |
| 368 // If shrinking, move to-space down to abut the end of from-space | |
| 369 // so that shrinking will move to-space down. If not shrinking | |
| 370 // to-space is moving up to allow for growth on the next expansion. | |
| 371 if (requested_eden_size <= cur_eden_size) { | |
| 372 to_start = from_end; | |
| 373 if (to_start + requested_survivor_size > to_start) { | |
| 374 to_end = to_start + requested_survivor_size; | |
| 375 } | |
| 376 } | |
| 377 // else leave to_end pointing to the high end of the virtual space. | |
| 378 } | |
| 379 | |
| 380 guarantee(to_start != to_end, "to space is zero sized"); | |
| 381 | |
| 382 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 383 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 384 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 385 eden_start, | |
| 386 eden_end, | |
| 387 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 388 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 389 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 390 from_start, | |
| 391 from_end, | |
| 392 pointer_delta(from_end, from_start, sizeof(char))); | |
| 393 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 394 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 395 to_start, | |
| 396 to_end, | |
| 397 pointer_delta( to_end, to_start, sizeof(char))); | |
| 398 } | |
| 399 } else { | |
| 400 // Eden, to, from | |
| 401 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 402 gclog_or_tty->print_cr(" Eden, to, from:"); | |
| 403 } | |
| 404 | |
| 405 // Calculate the to-space boundaries based on | |
| 406 // the start of from-space. | |
| 407 to_end = from_start; | |
| 408 to_start = (char*)pointer_delta(from_start, | |
| 409 (char*)requested_survivor_size, | |
| 410 sizeof(char)); | |
| 411 // Calculate the ideal eden boundaries. | |
| 412 // eden_end is already at the bottom of the generation | |
| 413 assert(eden_start == virtual_space()->low(), | |
| 414 "Eden is not starting at the low end of the virtual space"); | |
| 415 if (eden_start + requested_eden_size >= eden_start) { | |
| 416 eden_end = eden_start + requested_eden_size; | |
| 417 } else { | |
| 418 eden_end = to_start; | |
| 419 } | |
| 420 | |
| 421 // Does eden intrude into to-space? to-space | |
| 422 // gets priority but eden is not allowed to shrink | |
| 423 // to 0. | |
| 424 if (eden_end > to_start) { | |
| 425 eden_end = to_start; | |
| 426 } | |
| 427 | |
| 428 // Don't let eden shrink down to 0 or less. | |
| 429 eden_end = MAX2(eden_end, eden_start + alignment); | |
| 430 assert(eden_start + alignment >= eden_start, "Overflow"); | |
| 431 | |
| 432 size_t eden_size; | |
| 433 if (maintain_minimum) { | |
| 434 // Use all the space available. | |
| 435 eden_end = MAX2(eden_end, to_start); | |
| 436 eden_size = pointer_delta(eden_end, eden_start, sizeof(char)); | |
| 437 eden_size = MIN2(eden_size, cur_eden_size); | |
| 438 } else { | |
| 439 eden_size = pointer_delta(eden_end, eden_start, sizeof(char)); | |
| 440 } | |
| 441 eden_size = align_size_down(eden_size, alignment); | |
| 442 assert(maintain_minimum || eden_size <= requested_eden_size, | |
| 443 "Eden size is too large"); | |
| 444 assert(eden_size >= alignment, "Eden size is too small"); | |
| 445 eden_end = eden_start + eden_size; | |
| 446 | |
| 447 // Move to-space down to eden. | |
| 448 if (requested_eden_size < cur_eden_size) { | |
| 449 to_start = eden_end; | |
| 450 if (to_start + requested_survivor_size > to_start) { | |
| 451 to_end = MIN2(from_start, to_start + requested_survivor_size); | |
| 452 } else { | |
| 453 to_end = from_start; | |
| 454 } | |
| 455 } | |
| 456 | |
| 457 // eden_end may have moved so again make sure | |
| 458 // the to-space and eden don't overlap. | |
| 459 to_start = MAX2(eden_end, to_start); | |
| 460 | |
| 461 // from-space | |
| 462 size_t from_used = from()->used(); | |
| 463 if (requested_survivor_size > from_used) { | |
| 464 if (from_start + requested_survivor_size >= from_start) { | |
| 465 from_end = from_start + requested_survivor_size; | |
| 466 } | |
| 467 if (from_end > virtual_space()->high()) { | |
| 468 from_end = virtual_space()->high(); | |
| 469 } | |
| 470 } | |
| 471 | |
| 472 assert(to_start >= eden_end, "to-space should be above eden"); | |
| 473 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 474 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 475 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 476 eden_start, | |
| 477 eden_end, | |
| 478 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 479 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 480 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 481 to_start, | |
| 482 to_end, | |
| 483 pointer_delta( to_end, to_start, sizeof(char))); | |
| 484 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 485 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 486 from_start, | |
| 487 from_end, | |
| 488 pointer_delta(from_end, from_start, sizeof(char))); | |
| 489 } | |
| 490 } | |
| 491 | |
| 492 | |
| 493 guarantee((HeapWord*)from_start <= from()->bottom(), | |
| 494 "from start moved to the right"); | |
| 495 guarantee((HeapWord*)from_end >= from()->top(), | |
| 496 "from end moved into live data"); | |
| 497 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
| 498 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
| 499 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
| 500 | |
| 501 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
| 502 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
| 503 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
| 504 | |
| 505 // Let's make sure the call to initialize doesn't reset "top"! | |
| 506 HeapWord* old_from_top = from()->top(); | |
| 507 | |
| 508 // For PrintAdaptiveSizePolicy block below | |
| 509 size_t old_from = from()->capacity(); | |
| 510 size_t old_to = to()->capacity(); | |
| 511 | |
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512 // If not clearing the spaces, do some checking to verify that |
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513 // the spaces are already mangled. |
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514 |
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515 // Must check mangling before the spaces are reshaped. Otherwise, |
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516 // the bottom or end of one space may have moved into another |
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517 // a failure of the check may not correctly indicate which space |
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518 // is not properly mangled. |
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519 if (ZapUnusedHeapArea) { |
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520 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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521 eden()->check_mangled_unused_area(limit); |
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522 from()->check_mangled_unused_area(limit); |
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523 to()->check_mangled_unused_area(limit); |
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524 } |
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525 |
| 0 | 526 // The call to initialize NULL's the next compaction space |
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527 eden()->initialize(edenMR, |
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528 SpaceDecorator::Clear, |
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529 SpaceDecorator::DontMangle); |
| 0 | 530 eden()->set_next_compaction_space(from()); |
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531 to()->initialize(toMR , |
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532 SpaceDecorator::Clear, |
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533 SpaceDecorator::DontMangle); |
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534 from()->initialize(fromMR, |
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535 SpaceDecorator::DontClear, |
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536 SpaceDecorator::DontMangle); |
| 0 | 537 |
| 538 assert(from()->top() == old_from_top, "from top changed!"); | |
| 539 | |
| 540 if (PrintAdaptiveSizePolicy) { | |
| 541 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 542 assert(gch->kind() == CollectedHeap::GenCollectedHeap, "Sanity"); | |
| 543 | |
| 544 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
| 545 "collection: %d " | |
| 546 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
| 547 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
| 548 gch->total_collections(), | |
| 549 old_from, old_to, | |
| 550 from()->capacity(), | |
| 551 to()->capacity()); | |
| 552 gclog_or_tty->cr(); | |
| 553 } | |
| 554 } | |
| 555 | |
| 556 void ASParNewGeneration::compute_new_size() { | |
| 557 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 558 assert(gch->kind() == CollectedHeap::GenCollectedHeap, | |
| 559 "not a CMS generational heap"); | |
| 560 | |
| 561 | |
| 562 CMSAdaptiveSizePolicy* size_policy = | |
| 563 (CMSAdaptiveSizePolicy*)gch->gen_policy()->size_policy(); | |
| 564 assert(size_policy->is_gc_cms_adaptive_size_policy(), | |
| 565 "Wrong type of size policy"); | |
| 566 | |
| 567 size_t survived = from()->used(); | |
| 568 if (!survivor_overflow()) { | |
| 569 // Keep running averages on how much survived | |
| 570 size_policy->avg_survived()->sample(survived); | |
| 571 } else { | |
| 572 size_t promoted = | |
| 573 (size_t) next_gen()->gc_stats()->avg_promoted()->last_sample(); | |
| 574 assert(promoted < gch->capacity(), "Conversion problem?"); | |
| 575 size_t survived_guess = survived + promoted; | |
| 576 size_policy->avg_survived()->sample(survived_guess); | |
| 577 } | |
| 578 | |
| 579 size_t survivor_limit = max_survivor_size(); | |
| 580 _tenuring_threshold = | |
| 581 size_policy->compute_survivor_space_size_and_threshold( | |
| 582 _survivor_overflow, | |
| 583 _tenuring_threshold, | |
| 584 survivor_limit); | |
| 585 size_policy->avg_young_live()->sample(used()); | |
| 586 size_policy->avg_eden_live()->sample(eden()->used()); | |
| 587 | |
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588 size_policy->compute_eden_space_size(eden()->capacity(), max_gen_size()); |
| 0 | 589 |
| 590 resize(size_policy->calculated_eden_size_in_bytes(), | |
| 591 size_policy->calculated_survivor_size_in_bytes()); | |
| 592 | |
| 593 if (UsePerfData) { | |
| 594 CMSGCAdaptivePolicyCounters* counters = | |
| 595 (CMSGCAdaptivePolicyCounters*) gch->collector_policy()->counters(); | |
| 596 assert(counters->kind() == | |
| 597 GCPolicyCounters::CMSGCAdaptivePolicyCountersKind, | |
| 598 "Wrong kind of counters"); | |
| 599 counters->update_tenuring_threshold(_tenuring_threshold); | |
| 600 counters->update_survivor_overflowed(_survivor_overflow); | |
| 601 counters->update_young_capacity(capacity()); | |
| 602 } | |
| 603 } | |
| 604 | |
| 605 | |
| 606 #ifndef PRODUCT | |
| 607 // Changes from PSYoungGen version | |
| 608 // value of "alignment" | |
| 609 void ASParNewGeneration::space_invariants() { | |
| 610 const size_t alignment = os::vm_page_size(); | |
| 611 | |
| 612 // Currently, our eden size cannot shrink to zero | |
| 613 guarantee(eden()->capacity() >= alignment, "eden too small"); | |
| 614 guarantee(from()->capacity() >= alignment, "from too small"); | |
| 615 guarantee(to()->capacity() >= alignment, "to too small"); | |
| 616 | |
| 617 // Relationship of spaces to each other | |
| 618 char* eden_start = (char*)eden()->bottom(); | |
| 619 char* eden_end = (char*)eden()->end(); | |
| 620 char* from_start = (char*)from()->bottom(); | |
| 621 char* from_end = (char*)from()->end(); | |
| 622 char* to_start = (char*)to()->bottom(); | |
| 623 char* to_end = (char*)to()->end(); | |
| 624 | |
| 625 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); | |
| 626 guarantee(eden_start < eden_end, "eden space consistency"); | |
| 627 guarantee(from_start < from_end, "from space consistency"); | |
| 628 guarantee(to_start < to_end, "to space consistency"); | |
| 629 | |
| 630 // Check whether from space is below to space | |
| 631 if (from_start < to_start) { | |
| 632 // Eden, from, to | |
| 633 guarantee(eden_end <= from_start, "eden/from boundary"); | |
| 634 guarantee(from_end <= to_start, "from/to boundary"); | |
| 635 guarantee(to_end <= virtual_space()->high(), "to end"); | |
| 636 } else { | |
| 637 // Eden, to, from | |
| 638 guarantee(eden_end <= to_start, "eden/to boundary"); | |
| 639 guarantee(to_end <= from_start, "to/from boundary"); | |
| 640 guarantee(from_end <= virtual_space()->high(), "from end"); | |
| 641 } | |
| 642 | |
| 643 // More checks that the virtual space is consistent with the spaces | |
| 644 assert(virtual_space()->committed_size() >= | |
| 645 (eden()->capacity() + | |
| 646 to()->capacity() + | |
| 647 from()->capacity()), "Committed size is inconsistent"); | |
| 648 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
| 649 "Space invariant"); | |
| 650 char* eden_top = (char*)eden()->top(); | |
| 651 char* from_top = (char*)from()->top(); | |
| 652 char* to_top = (char*)to()->top(); | |
| 653 assert(eden_top <= virtual_space()->high(), "eden top"); | |
| 654 assert(from_top <= virtual_space()->high(), "from top"); | |
| 655 assert(to_top <= virtual_space()->high(), "to top"); | |
| 656 } | |
| 657 #endif |