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annotate src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 46d7652b223c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 2010, 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/asPSYoungGen.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
| 31 #include "gc_implementation/shared/gcUtil.hpp" | |
| 32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 33 #include "oops/oop.inline.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 0 | 35 |
| 36 ASPSYoungGen::ASPSYoungGen(size_t init_byte_size, | |
| 37 size_t minimum_byte_size, | |
| 38 size_t byte_size_limit) : | |
| 39 PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
| 40 _gen_size_limit(byte_size_limit) { | |
| 41 } | |
| 42 | |
| 43 | |
| 44 ASPSYoungGen::ASPSYoungGen(PSVirtualSpace* vs, | |
| 45 size_t init_byte_size, | |
| 46 size_t minimum_byte_size, | |
| 47 size_t byte_size_limit) : | |
| 48 //PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
| 49 PSYoungGen(vs->committed_size(), minimum_byte_size, byte_size_limit), | |
| 50 _gen_size_limit(byte_size_limit) { | |
| 51 | |
| 52 assert(vs->committed_size() == init_byte_size, "Cannot replace with"); | |
| 53 | |
| 54 _virtual_space = vs; | |
| 55 } | |
| 56 | |
| 57 void ASPSYoungGen::initialize_virtual_space(ReservedSpace rs, | |
| 58 size_t alignment) { | |
| 59 assert(_init_gen_size != 0, "Should have a finite size"); | |
| 60 _virtual_space = new PSVirtualSpaceHighToLow(rs, alignment); | |
| 61 if (!_virtual_space->expand_by(_init_gen_size)) { | |
| 62 vm_exit_during_initialization("Could not reserve enough space for " | |
| 63 "object heap"); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 void ASPSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
| 68 initialize_virtual_space(rs, alignment); | |
| 69 initialize_work(); | |
| 70 } | |
| 71 | |
| 72 size_t ASPSYoungGen::available_for_expansion() { | |
| 73 | |
| 74 size_t current_committed_size = virtual_space()->committed_size(); | |
| 75 assert((gen_size_limit() >= current_committed_size), | |
| 76 "generation size limit is wrong"); | |
| 77 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 78 size_t result = gen_size_limit() - current_committed_size; | |
| 79 size_t result_aligned = align_size_down(result, heap->young_gen_alignment()); | |
| 80 return result_aligned; | |
| 81 } | |
| 82 | |
| 83 // Return the number of bytes the young gen is willing give up. | |
| 84 // | |
| 85 // Future implementations could check the survivors and if to_space is in the | |
| 86 // right place (below from_space), take a chunk from to_space. | |
| 87 size_t ASPSYoungGen::available_for_contraction() { | |
| 88 | |
| 89 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
| 90 if (uncommitted_bytes != 0) { | |
| 91 return uncommitted_bytes; | |
| 92 } | |
| 93 | |
| 94 if (eden_space()->is_empty()) { | |
| 95 // Respect the minimum size for eden and for the young gen as a whole. | |
| 96 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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97 const size_t eden_alignment = heap->intra_heap_alignment(); |
| 0 | 98 const size_t gen_alignment = heap->young_gen_alignment(); |
| 99 | |
| 100 assert(eden_space()->capacity_in_bytes() >= eden_alignment, | |
| 101 "Alignment is wrong"); | |
| 102 size_t eden_avail = eden_space()->capacity_in_bytes() - eden_alignment; | |
| 103 eden_avail = align_size_down(eden_avail, gen_alignment); | |
| 104 | |
| 105 assert(virtual_space()->committed_size() >= min_gen_size(), | |
| 106 "minimum gen size is wrong"); | |
| 107 size_t gen_avail = virtual_space()->committed_size() - min_gen_size(); | |
| 108 assert(virtual_space()->is_aligned(gen_avail), "not aligned"); | |
| 109 | |
| 110 const size_t max_contraction = MIN2(eden_avail, gen_avail); | |
| 111 // See comment for ASPSOldGen::available_for_contraction() | |
| 112 // for reasons the "increment" fraction is used. | |
| 113 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
| 114 size_t result = policy->eden_increment_aligned_down(max_contraction); | |
| 115 size_t result_aligned = align_size_down(result, gen_alignment); | |
| 116 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 117 gclog_or_tty->print_cr("ASPSYoungGen::available_for_contraction: %d K", | |
| 118 result_aligned/K); | |
| 119 gclog_or_tty->print_cr(" max_contraction %d K", max_contraction/K); | |
| 120 gclog_or_tty->print_cr(" eden_avail %d K", eden_avail/K); | |
| 121 gclog_or_tty->print_cr(" gen_avail %d K", gen_avail/K); | |
| 122 } | |
| 123 return result_aligned; | |
| 124 | |
| 125 } | |
| 126 | |
| 127 return 0; | |
| 128 } | |
| 129 | |
| 130 // The current implementation only considers to the end of eden. | |
| 131 // If to_space is below from_space, to_space is not considered. | |
| 132 // to_space can be. | |
| 133 size_t ASPSYoungGen::available_to_live() { | |
| 134 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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135 const size_t alignment = heap->intra_heap_alignment(); |
| 0 | 136 |
| 137 // Include any space that is committed but is not in eden. | |
| 138 size_t available = pointer_delta(eden_space()->bottom(), | |
| 139 virtual_space()->low(), | |
| 140 sizeof(char)); | |
| 141 | |
| 142 const size_t eden_capacity = eden_space()->capacity_in_bytes(); | |
| 143 if (eden_space()->is_empty() && eden_capacity > alignment) { | |
| 144 available += eden_capacity - alignment; | |
| 145 } | |
| 146 return available; | |
| 147 } | |
| 148 | |
| 149 // Similar to PSYoungGen::resize_generation() but | |
| 150 // allows sum of eden_size and 2 * survivor_size to exceed _max_gen_size | |
| 151 // expands at the low end of the virtual space | |
| 152 // moves the boundary between the generations in order to expand | |
| 153 // some additional diagnostics | |
| 154 // If no additional changes are required, this can be deleted | |
| 155 // and the changes factored back into PSYoungGen::resize_generation(). | |
| 156 bool ASPSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
| 157 const size_t alignment = virtual_space()->alignment(); | |
| 158 size_t orig_size = virtual_space()->committed_size(); | |
| 159 bool size_changed = false; | |
| 160 | |
| 161 // There used to be a guarantee here that | |
| 162 // (eden_size + 2*survivor_size) <= _max_gen_size | |
| 163 // This requirement is enforced by the calculation of desired_size | |
| 164 // below. It may not be true on entry since the size of the | |
| 165 // eden_size is no bounded by the generation size. | |
| 166 | |
| 167 assert(max_size() == reserved().byte_size(), "max gen size problem?"); | |
| 168 assert(min_gen_size() <= orig_size && orig_size <= max_size(), | |
| 169 "just checking"); | |
| 170 | |
| 171 // Adjust new generation size | |
| 172 const size_t eden_plus_survivors = | |
| 173 align_size_up(eden_size + 2 * survivor_size, alignment); | |
| 174 size_t desired_size = MAX2(MIN2(eden_plus_survivors, gen_size_limit()), | |
| 175 min_gen_size()); | |
| 176 assert(desired_size <= gen_size_limit(), "just checking"); | |
| 177 | |
| 178 if (desired_size > orig_size) { | |
| 179 // Grow the generation | |
| 180 size_t change = desired_size - orig_size; | |
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181 HeapWord* prev_low = (HeapWord*) virtual_space()->low(); |
| 0 | 182 if (!virtual_space()->expand_by(change)) { |
| 183 return false; | |
| 184 } | |
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185 if (ZapUnusedHeapArea) { |
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186 // Mangle newly committed space immediately because it |
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187 // can be done here more simply that after the new |
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188 // spaces have been computed. |
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189 HeapWord* new_low = (HeapWord*) virtual_space()->low(); |
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190 assert(new_low < prev_low, "Did not grow"); |
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191 |
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192 MemRegion mangle_region(new_low, prev_low); |
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193 SpaceMangler::mangle_region(mangle_region); |
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194 } |
| 0 | 195 size_changed = true; |
| 196 } else if (desired_size < orig_size) { | |
| 197 size_t desired_change = orig_size - desired_size; | |
| 198 | |
| 199 // How much is available for shrinking. | |
| 200 size_t available_bytes = limit_gen_shrink(desired_change); | |
| 201 size_t change = MIN2(desired_change, available_bytes); | |
| 202 virtual_space()->shrink_by(change); | |
| 203 size_changed = true; | |
| 204 } else { | |
| 205 if (Verbose && PrintGC) { | |
| 206 if (orig_size == gen_size_limit()) { | |
| 207 gclog_or_tty->print_cr("ASPSYoung generation size at maximum: " | |
| 208 SIZE_FORMAT "K", orig_size/K); | |
| 209 } else if (orig_size == min_gen_size()) { | |
| 210 gclog_or_tty->print_cr("ASPSYoung generation size at minium: " | |
| 211 SIZE_FORMAT "K", orig_size/K); | |
| 212 } | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 if (size_changed) { | |
| 217 reset_after_change(); | |
| 218 if (Verbose && PrintGC) { | |
| 219 size_t current_size = virtual_space()->committed_size(); | |
| 220 gclog_or_tty->print_cr("ASPSYoung generation size changed: " | |
| 221 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
| 222 orig_size/K, current_size/K); | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
| 227 virtual_space()->committed_size() == max_size(), "Sanity"); | |
| 228 | |
| 229 return true; | |
| 230 } | |
| 231 | |
| 232 // Similar to PSYoungGen::resize_spaces() but | |
| 233 // eden always starts at the low end of the committed virtual space | |
| 234 // current implementation does not allow holes between the spaces | |
| 235 // _young_generation_boundary has to be reset because it changes. | |
| 236 // so additional verification | |
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237 |
| 0 | 238 void ASPSYoungGen::resize_spaces(size_t requested_eden_size, |
| 239 size_t requested_survivor_size) { | |
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240 assert(UseAdaptiveSizePolicy, "sanity check"); |
| 0 | 241 assert(requested_eden_size > 0 && requested_survivor_size > 0, |
| 242 "just checking"); | |
| 243 | |
| 244 space_invariants(); | |
| 245 | |
| 246 // We require eden and to space to be empty | |
| 247 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
| 248 return; | |
| 249 } | |
| 250 | |
| 251 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 252 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
| 253 SIZE_FORMAT | |
| 254 ", requested_survivor_size: " SIZE_FORMAT ")", | |
| 255 requested_eden_size, requested_survivor_size); | |
| 256 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 257 SIZE_FORMAT, | |
| 258 eden_space()->bottom(), | |
| 259 eden_space()->end(), | |
| 260 pointer_delta(eden_space()->end(), | |
| 261 eden_space()->bottom(), | |
| 262 sizeof(char))); | |
| 263 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 264 SIZE_FORMAT, | |
| 265 from_space()->bottom(), | |
| 266 from_space()->end(), | |
| 267 pointer_delta(from_space()->end(), | |
| 268 from_space()->bottom(), | |
| 269 sizeof(char))); | |
| 270 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 271 SIZE_FORMAT, | |
| 272 to_space()->bottom(), | |
| 273 to_space()->end(), | |
| 274 pointer_delta( to_space()->end(), | |
| 275 to_space()->bottom(), | |
| 276 sizeof(char))); | |
| 277 } | |
| 278 | |
| 279 // There's nothing to do if the new sizes are the same as the current | |
| 280 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
| 281 requested_survivor_size == from_space()->capacity_in_bytes() && | |
| 282 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
| 283 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 284 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
| 285 } | |
| 286 return; | |
| 287 } | |
| 288 | |
| 289 char* eden_start = (char*)virtual_space()->low(); | |
| 290 char* eden_end = (char*)eden_space()->end(); | |
| 291 char* from_start = (char*)from_space()->bottom(); | |
| 292 char* from_end = (char*)from_space()->end(); | |
| 293 char* to_start = (char*)to_space()->bottom(); | |
| 294 char* to_end = (char*)to_space()->end(); | |
| 295 | |
| 296 assert(eden_start < from_start, "Cannot push into from_space"); | |
| 297 | |
| 298 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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299 const size_t alignment = heap->intra_heap_alignment(); |
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300 const bool maintain_minimum = |
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301 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); |
| 0 | 302 |
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303 bool eden_from_to_order = from_start < to_start; |
| 0 | 304 // Check whether from space is below to space |
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305 if (eden_from_to_order) { |
| 0 | 306 // Eden, from, to |
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307 |
| 0 | 308 if (PrintAdaptiveSizePolicy && Verbose) { |
| 309 gclog_or_tty->print_cr(" Eden, from, to:"); | |
| 310 } | |
| 311 | |
| 312 // Set eden | |
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313 // "requested_eden_size" is a goal for the size of eden |
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314 // and may not be attainable. "eden_size" below is |
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315 // calculated based on the location of from-space and |
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316 // the goal for the size of eden. from-space is |
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317 // fixed in place because it contains live data. |
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318 // The calculation is done this way to avoid 32bit |
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319 // overflow (i.e., eden_start + requested_eden_size |
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320 // may too large for representation in 32bits). |
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321 size_t eden_size; |
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322 if (maintain_minimum) { |
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323 // Only make eden larger than the requested size if |
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324 // the minimum size of the generation has to be maintained. |
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325 // This could be done in general but policy at a higher |
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326 // level is determining a requested size for eden and that |
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327 // should be honored unless there is a fundamental reason. |
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328 eden_size = pointer_delta(from_start, |
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329 eden_start, |
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330 sizeof(char)); |
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331 } else { |
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332 eden_size = MIN2(requested_eden_size, |
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333 pointer_delta(from_start, eden_start, sizeof(char))); |
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334 } |
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335 |
| 0 | 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, | |
| 346 (char*)requested_survivor_size, | |
| 347 sizeof(char)); | |
| 348 | |
| 349 // Does the optimal to-space overlap from-space? | |
| 350 if (to_start < (char*)from_space()->end()) { | |
| 351 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 352 | |
| 353 // Calculate the minimum offset possible for from_end | |
| 354 size_t from_size = | |
| 355 pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
| 356 | |
| 357 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
| 358 if (from_size == 0) { | |
| 359 from_size = alignment; | |
| 360 } else { | |
| 361 from_size = align_size_up(from_size, alignment); | |
| 362 } | |
| 363 | |
| 364 from_end = from_start + from_size; | |
| 365 assert(from_end > from_start, "addition overflow or from_size problem"); | |
| 366 | |
| 367 guarantee(from_end <= (char*)from_space()->end(), | |
| 368 "from_end moved to the right"); | |
| 369 | |
| 370 // Now update to_start with the new from_end | |
| 371 to_start = MAX2(from_end, to_start); | |
| 372 } | |
| 373 | |
| 374 guarantee(to_start != to_end, "to space is zero sized"); | |
| 375 | |
| 376 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 377 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 378 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 379 eden_start, | |
| 380 eden_end, | |
| 381 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 382 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 383 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 384 from_start, | |
| 385 from_end, | |
| 386 pointer_delta(from_end, from_start, sizeof(char))); | |
| 387 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 388 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 389 to_start, | |
| 390 to_end, | |
| 391 pointer_delta( to_end, to_start, sizeof(char))); | |
| 392 } | |
| 393 } else { | |
| 394 // Eden, to, from | |
| 395 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 396 gclog_or_tty->print_cr(" Eden, to, from:"); | |
| 397 } | |
| 398 | |
| 399 // To space gets priority over eden resizing. Note that we position | |
| 400 // to space as if we were able to resize from space, even though from | |
| 401 // space is not modified. | |
| 402 // Giving eden priority was tried and gave poorer performance. | |
| 403 to_end = (char*)pointer_delta(virtual_space()->high(), | |
| 404 (char*)requested_survivor_size, | |
| 405 sizeof(char)); | |
| 406 to_end = MIN2(to_end, from_start); | |
| 407 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
| 408 sizeof(char)); | |
| 409 // if the space sizes are to be increased by several times then | |
| 410 // 'to_start' will point beyond the young generation. In this case | |
| 411 // 'to_start' should be adjusted. | |
| 412 to_start = MAX2(to_start, eden_start + alignment); | |
| 413 | |
| 414 // Compute how big eden can be, then adjust end. | |
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415 // See comments above on calculating eden_end. |
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416 size_t eden_size; |
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417 if (maintain_minimum) { |
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418 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); |
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419 } else { |
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420 eden_size = MIN2(requested_eden_size, |
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421 pointer_delta(to_start, eden_start, sizeof(char))); |
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422 } |
| 0 | 423 eden_end = eden_start + eden_size; |
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424 assert(eden_end >= eden_start, "addition overflowed"); |
| 0 | 425 |
| 426 // Don't let eden shrink down to 0 or less. | |
| 427 eden_end = MAX2(eden_end, eden_start + alignment); | |
| 428 to_start = MAX2(to_start, eden_end); | |
| 429 | |
| 430 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 431 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 432 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 433 eden_start, | |
| 434 eden_end, | |
| 435 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 436 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 437 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 438 to_start, | |
| 439 to_end, | |
| 440 pointer_delta( to_end, to_start, sizeof(char))); | |
| 441 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 442 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 443 from_start, | |
| 444 from_end, | |
| 445 pointer_delta(from_end, from_start, sizeof(char))); | |
| 446 } | |
| 447 } | |
| 448 | |
| 449 | |
| 450 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
| 451 "from start moved to the right"); | |
| 452 guarantee((HeapWord*)from_end >= from_space()->top(), | |
| 453 "from end moved into live data"); | |
| 454 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
| 455 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
| 456 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
| 457 | |
| 458 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
| 459 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
| 460 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
| 461 | |
| 462 // Let's make sure the call to initialize doesn't reset "top"! | |
| 463 DEBUG_ONLY(HeapWord* old_from_top = from_space()->top();) | |
| 464 | |
| 465 // For PrintAdaptiveSizePolicy block below | |
| 466 size_t old_from = from_space()->capacity_in_bytes(); | |
| 467 size_t old_to = to_space()->capacity_in_bytes(); | |
| 468 | |
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469 if (ZapUnusedHeapArea) { |
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470 // NUMA is a special case because a numa space is not mangled |
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471 // in order to not prematurely bind its address to memory to |
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472 // the wrong memory (i.e., don't want the GC thread to first |
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473 // touch the memory). The survivor spaces are not numa |
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474 // spaces and are mangled. |
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475 if (UseNUMA) { |
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476 if (eden_from_to_order) { |
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477 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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478 } else { |
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479 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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480 } |
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481 } |
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482 |
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483 // If not mangling the spaces, do some checking to verify that |
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484 // the spaces are already mangled. |
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485 // The spaces should be correctly mangled at this point so |
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486 // do some checking here. Note that they are not being mangled |
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487 // in the calls to initialize(). |
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488 // Must check mangling before the spaces are reshaped. Otherwise, |
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489 // the bottom or end of one space may have moved into an area |
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490 // covered by another space and a failure of the check may |
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491 // not correctly indicate which space is not properly mangled. |
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492 |
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493 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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494 eden_space()->check_mangled_unused_area(limit); |
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495 from_space()->check_mangled_unused_area(limit); |
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496 to_space()->check_mangled_unused_area(limit); |
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497 } |
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498 // When an existing space is being initialized, it is not |
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499 // mangled because the space has been previously mangled. |
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500 eden_space()->initialize(edenMR, |
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501 SpaceDecorator::Clear, |
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502 SpaceDecorator::DontMangle); |
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503 to_space()->initialize(toMR, |
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504 SpaceDecorator::Clear, |
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505 SpaceDecorator::DontMangle); |
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506 from_space()->initialize(fromMR, |
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507 SpaceDecorator::DontClear, |
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508 SpaceDecorator::DontMangle); |
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509 |
| 0 | 510 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
| 511 | |
| 512 assert(from_space()->top() == old_from_top, "from top changed!"); | |
| 513 | |
| 514 if (PrintAdaptiveSizePolicy) { | |
| 515 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 516 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 517 | |
| 518 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
| 519 "collection: %d " | |
| 520 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
| 521 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
| 522 heap->total_collections(), | |
| 523 old_from, old_to, | |
| 524 from_space()->capacity_in_bytes(), | |
| 525 to_space()->capacity_in_bytes()); | |
| 526 gclog_or_tty->cr(); | |
| 527 } | |
| 528 space_invariants(); | |
| 529 } | |
| 530 void ASPSYoungGen::reset_after_change() { | |
| 531 assert_locked_or_safepoint(Heap_lock); | |
| 532 | |
| 533 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
| 534 (HeapWord*)virtual_space()->high_boundary()); | |
| 535 PSScavenge::reference_processor()->set_span(_reserved); | |
| 536 | |
| 537 HeapWord* new_eden_bottom = (HeapWord*)virtual_space()->low(); | |
| 538 HeapWord* eden_bottom = eden_space()->bottom(); | |
| 539 if (new_eden_bottom != eden_bottom) { | |
| 540 MemRegion eden_mr(new_eden_bottom, eden_space()->end()); | |
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541 eden_space()->initialize(eden_mr, |
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542 SpaceDecorator::Clear, |
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543 SpaceDecorator::Mangle); |
| 0 | 544 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
| 545 } | |
| 546 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
| 547 (HeapWord*)virtual_space()->high()); | |
| 548 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
| 549 | |
| 550 space_invariants(); | |
| 551 } |