Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.cpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | 850fdf70db2b |
| children | cff162798819 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2003-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_asPSYoungGen.cpp.incl" | |
| 27 | |
| 28 ASPSYoungGen::ASPSYoungGen(size_t init_byte_size, | |
| 29 size_t minimum_byte_size, | |
| 30 size_t byte_size_limit) : | |
| 31 PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
| 32 _gen_size_limit(byte_size_limit) { | |
| 33 } | |
| 34 | |
| 35 | |
| 36 ASPSYoungGen::ASPSYoungGen(PSVirtualSpace* vs, | |
| 37 size_t init_byte_size, | |
| 38 size_t minimum_byte_size, | |
| 39 size_t byte_size_limit) : | |
| 40 //PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
| 41 PSYoungGen(vs->committed_size(), minimum_byte_size, byte_size_limit), | |
| 42 _gen_size_limit(byte_size_limit) { | |
| 43 | |
| 44 assert(vs->committed_size() == init_byte_size, "Cannot replace with"); | |
| 45 | |
| 46 _virtual_space = vs; | |
| 47 } | |
| 48 | |
| 49 void ASPSYoungGen::initialize_virtual_space(ReservedSpace rs, | |
| 50 size_t alignment) { | |
| 51 assert(_init_gen_size != 0, "Should have a finite size"); | |
| 52 _virtual_space = new PSVirtualSpaceHighToLow(rs, alignment); | |
| 53 if (!_virtual_space->expand_by(_init_gen_size)) { | |
| 54 vm_exit_during_initialization("Could not reserve enough space for " | |
| 55 "object heap"); | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 void ASPSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
| 60 initialize_virtual_space(rs, alignment); | |
| 61 initialize_work(); | |
| 62 } | |
| 63 | |
| 64 size_t ASPSYoungGen::available_for_expansion() { | |
| 65 | |
| 66 size_t current_committed_size = virtual_space()->committed_size(); | |
| 67 assert((gen_size_limit() >= current_committed_size), | |
| 68 "generation size limit is wrong"); | |
| 69 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 70 size_t result = gen_size_limit() - current_committed_size; | |
| 71 size_t result_aligned = align_size_down(result, heap->young_gen_alignment()); | |
| 72 return result_aligned; | |
| 73 } | |
| 74 | |
| 75 // Return the number of bytes the young gen is willing give up. | |
| 76 // | |
| 77 // Future implementations could check the survivors and if to_space is in the | |
| 78 // right place (below from_space), take a chunk from to_space. | |
| 79 size_t ASPSYoungGen::available_for_contraction() { | |
| 80 | |
| 81 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
| 82 if (uncommitted_bytes != 0) { | |
| 83 return uncommitted_bytes; | |
| 84 } | |
| 85 | |
| 86 if (eden_space()->is_empty()) { | |
| 87 // Respect the minimum size for eden and for the young gen as a whole. | |
| 88 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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89 const size_t eden_alignment = heap->intra_heap_alignment(); |
| 0 | 90 const size_t gen_alignment = heap->young_gen_alignment(); |
| 91 | |
| 92 assert(eden_space()->capacity_in_bytes() >= eden_alignment, | |
| 93 "Alignment is wrong"); | |
| 94 size_t eden_avail = eden_space()->capacity_in_bytes() - eden_alignment; | |
| 95 eden_avail = align_size_down(eden_avail, gen_alignment); | |
| 96 | |
| 97 assert(virtual_space()->committed_size() >= min_gen_size(), | |
| 98 "minimum gen size is wrong"); | |
| 99 size_t gen_avail = virtual_space()->committed_size() - min_gen_size(); | |
| 100 assert(virtual_space()->is_aligned(gen_avail), "not aligned"); | |
| 101 | |
| 102 const size_t max_contraction = MIN2(eden_avail, gen_avail); | |
| 103 // See comment for ASPSOldGen::available_for_contraction() | |
| 104 // for reasons the "increment" fraction is used. | |
| 105 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
| 106 size_t result = policy->eden_increment_aligned_down(max_contraction); | |
| 107 size_t result_aligned = align_size_down(result, gen_alignment); | |
| 108 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 109 gclog_or_tty->print_cr("ASPSYoungGen::available_for_contraction: %d K", | |
| 110 result_aligned/K); | |
| 111 gclog_or_tty->print_cr(" max_contraction %d K", max_contraction/K); | |
| 112 gclog_or_tty->print_cr(" eden_avail %d K", eden_avail/K); | |
| 113 gclog_or_tty->print_cr(" gen_avail %d K", gen_avail/K); | |
| 114 } | |
| 115 return result_aligned; | |
| 116 | |
| 117 } | |
| 118 | |
| 119 return 0; | |
| 120 } | |
| 121 | |
| 122 // The current implementation only considers to the end of eden. | |
| 123 // If to_space is below from_space, to_space is not considered. | |
| 124 // to_space can be. | |
| 125 size_t ASPSYoungGen::available_to_live() { | |
| 126 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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127 const size_t alignment = heap->intra_heap_alignment(); |
| 0 | 128 |
| 129 // Include any space that is committed but is not in eden. | |
| 130 size_t available = pointer_delta(eden_space()->bottom(), | |
| 131 virtual_space()->low(), | |
| 132 sizeof(char)); | |
| 133 | |
| 134 const size_t eden_capacity = eden_space()->capacity_in_bytes(); | |
| 135 if (eden_space()->is_empty() && eden_capacity > alignment) { | |
| 136 available += eden_capacity - alignment; | |
| 137 } | |
| 138 return available; | |
| 139 } | |
| 140 | |
| 141 // Similar to PSYoungGen::resize_generation() but | |
| 142 // allows sum of eden_size and 2 * survivor_size to exceed _max_gen_size | |
| 143 // expands at the low end of the virtual space | |
| 144 // moves the boundary between the generations in order to expand | |
| 145 // some additional diagnostics | |
| 146 // If no additional changes are required, this can be deleted | |
| 147 // and the changes factored back into PSYoungGen::resize_generation(). | |
| 148 bool ASPSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
| 149 const size_t alignment = virtual_space()->alignment(); | |
| 150 size_t orig_size = virtual_space()->committed_size(); | |
| 151 bool size_changed = false; | |
| 152 | |
| 153 // There used to be a guarantee here that | |
| 154 // (eden_size + 2*survivor_size) <= _max_gen_size | |
| 155 // This requirement is enforced by the calculation of desired_size | |
| 156 // below. It may not be true on entry since the size of the | |
| 157 // eden_size is no bounded by the generation size. | |
| 158 | |
| 159 assert(max_size() == reserved().byte_size(), "max gen size problem?"); | |
| 160 assert(min_gen_size() <= orig_size && orig_size <= max_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, gen_size_limit()), | |
| 167 min_gen_size()); | |
| 168 assert(desired_size <= gen_size_limit(), "just checking"); | |
| 169 | |
| 170 if (desired_size > orig_size) { | |
| 171 // Grow the generation | |
| 172 size_t change = desired_size - orig_size; | |
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173 HeapWord* prev_low = (HeapWord*) virtual_space()->low(); |
| 0 | 174 if (!virtual_space()->expand_by(change)) { |
| 175 return false; | |
| 176 } | |
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177 if (ZapUnusedHeapArea) { |
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178 // Mangle newly committed space immediately because it |
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179 // can be done here more simply that after the new |
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180 // spaces have been computed. |
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181 HeapWord* new_low = (HeapWord*) virtual_space()->low(); |
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182 assert(new_low < prev_low, "Did not grow"); |
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183 |
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184 MemRegion mangle_region(new_low, prev_low); |
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185 SpaceMangler::mangle_region(mangle_region); |
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186 } |
| 0 | 187 size_changed = true; |
| 188 } else if (desired_size < orig_size) { | |
| 189 size_t desired_change = orig_size - desired_size; | |
| 190 | |
| 191 // How much is available for shrinking. | |
| 192 size_t available_bytes = limit_gen_shrink(desired_change); | |
| 193 size_t change = MIN2(desired_change, available_bytes); | |
| 194 virtual_space()->shrink_by(change); | |
| 195 size_changed = true; | |
| 196 } else { | |
| 197 if (Verbose && PrintGC) { | |
| 198 if (orig_size == gen_size_limit()) { | |
| 199 gclog_or_tty->print_cr("ASPSYoung generation size at maximum: " | |
| 200 SIZE_FORMAT "K", orig_size/K); | |
| 201 } else if (orig_size == min_gen_size()) { | |
| 202 gclog_or_tty->print_cr("ASPSYoung generation size at minium: " | |
| 203 SIZE_FORMAT "K", orig_size/K); | |
| 204 } | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 if (size_changed) { | |
| 209 reset_after_change(); | |
| 210 if (Verbose && PrintGC) { | |
| 211 size_t current_size = virtual_space()->committed_size(); | |
| 212 gclog_or_tty->print_cr("ASPSYoung generation size changed: " | |
| 213 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
| 214 orig_size/K, current_size/K); | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
| 219 virtual_space()->committed_size() == max_size(), "Sanity"); | |
| 220 | |
| 221 return true; | |
| 222 } | |
| 223 | |
| 224 // Similar to PSYoungGen::resize_spaces() but | |
| 225 // eden always starts at the low end of the committed virtual space | |
| 226 // current implementation does not allow holes between the spaces | |
| 227 // _young_generation_boundary has to be reset because it changes. | |
| 228 // so additional verification | |
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229 |
| 0 | 230 void ASPSYoungGen::resize_spaces(size_t requested_eden_size, |
| 231 size_t requested_survivor_size) { | |
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232 assert(UseAdaptiveSizePolicy, "sanity check"); |
| 0 | 233 assert(requested_eden_size > 0 && requested_survivor_size > 0, |
| 234 "just checking"); | |
| 235 | |
| 236 space_invariants(); | |
| 237 | |
| 238 // We require eden and to space to be empty | |
| 239 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
| 240 return; | |
| 241 } | |
| 242 | |
| 243 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 244 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
| 245 SIZE_FORMAT | |
| 246 ", requested_survivor_size: " SIZE_FORMAT ")", | |
| 247 requested_eden_size, requested_survivor_size); | |
| 248 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 249 SIZE_FORMAT, | |
| 250 eden_space()->bottom(), | |
| 251 eden_space()->end(), | |
| 252 pointer_delta(eden_space()->end(), | |
| 253 eden_space()->bottom(), | |
| 254 sizeof(char))); | |
| 255 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 256 SIZE_FORMAT, | |
| 257 from_space()->bottom(), | |
| 258 from_space()->end(), | |
| 259 pointer_delta(from_space()->end(), | |
| 260 from_space()->bottom(), | |
| 261 sizeof(char))); | |
| 262 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
| 263 SIZE_FORMAT, | |
| 264 to_space()->bottom(), | |
| 265 to_space()->end(), | |
| 266 pointer_delta( to_space()->end(), | |
| 267 to_space()->bottom(), | |
| 268 sizeof(char))); | |
| 269 } | |
| 270 | |
| 271 // There's nothing to do if the new sizes are the same as the current | |
| 272 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
| 273 requested_survivor_size == from_space()->capacity_in_bytes() && | |
| 274 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
| 275 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 276 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
| 277 } | |
| 278 return; | |
| 279 } | |
| 280 | |
| 281 char* eden_start = (char*)virtual_space()->low(); | |
| 282 char* eden_end = (char*)eden_space()->end(); | |
| 283 char* from_start = (char*)from_space()->bottom(); | |
| 284 char* from_end = (char*)from_space()->end(); | |
| 285 char* to_start = (char*)to_space()->bottom(); | |
| 286 char* to_end = (char*)to_space()->end(); | |
| 287 | |
| 288 assert(eden_start < from_start, "Cannot push into from_space"); | |
| 289 | |
| 290 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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291 const size_t alignment = heap->intra_heap_alignment(); |
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292 const bool maintain_minimum = |
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293 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); |
| 0 | 294 |
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295 bool eden_from_to_order = from_start < to_start; |
| 0 | 296 // Check whether from space is below to space |
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297 if (eden_from_to_order) { |
| 0 | 298 // Eden, from, to |
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299 |
| 0 | 300 if (PrintAdaptiveSizePolicy && Verbose) { |
| 301 gclog_or_tty->print_cr(" Eden, from, to:"); | |
| 302 } | |
| 303 | |
| 304 // Set eden | |
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305 // "requested_eden_size" is a goal for the size of eden |
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306 // and may not be attainable. "eden_size" below is |
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307 // calculated based on the location of from-space and |
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308 // the goal for the size of eden. from-space is |
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309 // fixed in place because it contains live data. |
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310 // The calculation is done this way to avoid 32bit |
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311 // overflow (i.e., eden_start + requested_eden_size |
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312 // may too large for representation in 32bits). |
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313 size_t eden_size; |
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314 if (maintain_minimum) { |
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315 // Only make eden larger than the requested size if |
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316 // the minimum size of the generation has to be maintained. |
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317 // This could be done in general but policy at a higher |
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318 // level is determining a requested size for eden and that |
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319 // should be honored unless there is a fundamental reason. |
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320 eden_size = pointer_delta(from_start, |
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321 eden_start, |
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322 sizeof(char)); |
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323 } else { |
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324 eden_size = MIN2(requested_eden_size, |
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325 pointer_delta(from_start, eden_start, sizeof(char))); |
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326 } |
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327 |
| 0 | 328 eden_end = eden_start + eden_size; |
| 329 assert(eden_end >= eden_start, "addition overflowed") | |
| 330 | |
| 331 // To may resize into from space as long as it is clear of live data. | |
| 332 // From space must remain page aligned, though, so we need to do some | |
| 333 // extra calculations. | |
| 334 | |
| 335 // First calculate an optimal to-space | |
| 336 to_end = (char*)virtual_space()->high(); | |
| 337 to_start = (char*)pointer_delta(to_end, | |
| 338 (char*)requested_survivor_size, | |
| 339 sizeof(char)); | |
| 340 | |
| 341 // Does the optimal to-space overlap from-space? | |
| 342 if (to_start < (char*)from_space()->end()) { | |
| 343 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 344 | |
| 345 // Calculate the minimum offset possible for from_end | |
| 346 size_t from_size = | |
| 347 pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
| 348 | |
| 349 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
| 350 if (from_size == 0) { | |
| 351 from_size = alignment; | |
| 352 } else { | |
| 353 from_size = align_size_up(from_size, alignment); | |
| 354 } | |
| 355 | |
| 356 from_end = from_start + from_size; | |
| 357 assert(from_end > from_start, "addition overflow or from_size problem"); | |
| 358 | |
| 359 guarantee(from_end <= (char*)from_space()->end(), | |
| 360 "from_end moved to the right"); | |
| 361 | |
| 362 // Now update to_start with the new from_end | |
| 363 to_start = MAX2(from_end, to_start); | |
| 364 } | |
| 365 | |
| 366 guarantee(to_start != to_end, "to space is zero sized"); | |
| 367 | |
| 368 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 369 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 370 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 371 eden_start, | |
| 372 eden_end, | |
| 373 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 374 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 375 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 376 from_start, | |
| 377 from_end, | |
| 378 pointer_delta(from_end, from_start, sizeof(char))); | |
| 379 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 380 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 381 to_start, | |
| 382 to_end, | |
| 383 pointer_delta( to_end, to_start, sizeof(char))); | |
| 384 } | |
| 385 } else { | |
| 386 // Eden, to, from | |
| 387 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 388 gclog_or_tty->print_cr(" Eden, to, from:"); | |
| 389 } | |
| 390 | |
| 391 // To space gets priority over eden resizing. Note that we position | |
| 392 // to space as if we were able to resize from space, even though from | |
| 393 // space is not modified. | |
| 394 // Giving eden priority was tried and gave poorer performance. | |
| 395 to_end = (char*)pointer_delta(virtual_space()->high(), | |
| 396 (char*)requested_survivor_size, | |
| 397 sizeof(char)); | |
| 398 to_end = MIN2(to_end, from_start); | |
| 399 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
| 400 sizeof(char)); | |
| 401 // if the space sizes are to be increased by several times then | |
| 402 // 'to_start' will point beyond the young generation. In this case | |
| 403 // 'to_start' should be adjusted. | |
| 404 to_start = MAX2(to_start, eden_start + alignment); | |
| 405 | |
| 406 // Compute how big eden can be, then adjust end. | |
|
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407 // See comments above on calculating eden_end. |
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408 size_t eden_size; |
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409 if (maintain_minimum) { |
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410 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); |
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411 } else { |
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412 eden_size = MIN2(requested_eden_size, |
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413 pointer_delta(to_start, eden_start, sizeof(char))); |
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414 } |
| 0 | 415 eden_end = eden_start + eden_size; |
| 416 assert(eden_end >= eden_start, "addition overflowed") | |
| 417 | |
| 418 // Don't let eden shrink down to 0 or less. | |
| 419 eden_end = MAX2(eden_end, eden_start + alignment); | |
| 420 to_start = MAX2(to_start, eden_end); | |
| 421 | |
| 422 if (PrintAdaptiveSizePolicy && Verbose) { | |
| 423 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
| 424 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 425 eden_start, | |
| 426 eden_end, | |
| 427 pointer_delta(eden_end, eden_start, sizeof(char))); | |
| 428 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
| 429 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 430 to_start, | |
| 431 to_end, | |
| 432 pointer_delta( to_end, to_start, sizeof(char))); | |
| 433 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
| 434 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
| 435 from_start, | |
| 436 from_end, | |
| 437 pointer_delta(from_end, from_start, sizeof(char))); | |
| 438 } | |
| 439 } | |
| 440 | |
| 441 | |
| 442 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
| 443 "from start moved to the right"); | |
| 444 guarantee((HeapWord*)from_end >= from_space()->top(), | |
| 445 "from end moved into live data"); | |
| 446 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
| 447 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
| 448 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
| 449 | |
| 450 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
| 451 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
| 452 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
| 453 | |
| 454 // Let's make sure the call to initialize doesn't reset "top"! | |
| 455 DEBUG_ONLY(HeapWord* old_from_top = from_space()->top();) | |
| 456 | |
| 457 // For PrintAdaptiveSizePolicy block below | |
| 458 size_t old_from = from_space()->capacity_in_bytes(); | |
| 459 size_t old_to = to_space()->capacity_in_bytes(); | |
| 460 | |
|
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461 if (ZapUnusedHeapArea) { |
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462 // NUMA is a special case because a numa space is not mangled |
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463 // in order to not prematurely bind its address to memory to |
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464 // the wrong memory (i.e., don't want the GC thread to first |
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465 // touch the memory). The survivor spaces are not numa |
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466 // spaces and are mangled. |
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467 if (UseNUMA) { |
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468 if (eden_from_to_order) { |
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469 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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470 } else { |
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471 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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472 } |
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473 } |
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474 |
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475 // If not mangling the spaces, do some checking to verify that |
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476 // the spaces are already mangled. |
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477 // The spaces should be correctly mangled at this point so |
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478 // do some checking here. Note that they are not being mangled |
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479 // in the calls to initialize(). |
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480 // Must check mangling before the spaces are reshaped. Otherwise, |
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481 // the bottom or end of one space may have moved into an area |
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482 // covered by another space and a failure of the check may |
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483 // not correctly indicate which space is not properly mangled. |
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484 |
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485 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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486 eden_space()->check_mangled_unused_area(limit); |
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487 from_space()->check_mangled_unused_area(limit); |
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488 to_space()->check_mangled_unused_area(limit); |
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489 } |
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490 // When an existing space is being initialized, it is not |
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491 // mangled because the space has been previously mangled. |
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492 eden_space()->initialize(edenMR, |
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493 SpaceDecorator::Clear, |
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494 SpaceDecorator::DontMangle); |
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495 to_space()->initialize(toMR, |
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496 SpaceDecorator::Clear, |
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497 SpaceDecorator::DontMangle); |
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498 from_space()->initialize(fromMR, |
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499 SpaceDecorator::DontClear, |
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500 SpaceDecorator::DontMangle); |
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501 |
| 0 | 502 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
| 503 | |
| 504 assert(from_space()->top() == old_from_top, "from top changed!"); | |
| 505 | |
| 506 if (PrintAdaptiveSizePolicy) { | |
| 507 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 508 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 509 | |
| 510 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
| 511 "collection: %d " | |
| 512 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
| 513 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
| 514 heap->total_collections(), | |
| 515 old_from, old_to, | |
| 516 from_space()->capacity_in_bytes(), | |
| 517 to_space()->capacity_in_bytes()); | |
| 518 gclog_or_tty->cr(); | |
| 519 } | |
| 520 space_invariants(); | |
| 521 } | |
| 522 void ASPSYoungGen::reset_after_change() { | |
| 523 assert_locked_or_safepoint(Heap_lock); | |
| 524 | |
| 525 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
| 526 (HeapWord*)virtual_space()->high_boundary()); | |
| 527 PSScavenge::reference_processor()->set_span(_reserved); | |
| 528 | |
| 529 HeapWord* new_eden_bottom = (HeapWord*)virtual_space()->low(); | |
| 530 HeapWord* eden_bottom = eden_space()->bottom(); | |
| 531 if (new_eden_bottom != eden_bottom) { | |
| 532 MemRegion eden_mr(new_eden_bottom, eden_space()->end()); | |
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533 eden_space()->initialize(eden_mr, |
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534 SpaceDecorator::Clear, |
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535 SpaceDecorator::Mangle); |
| 0 | 536 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
| 537 } | |
| 538 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
| 539 (HeapWord*)virtual_space()->high()); | |
| 540 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
| 541 | |
| 542 space_invariants(); | |
| 543 } |