Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.cpp @ 20501:c204e2044c29
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Reviewed-by: coleenp, minqi
author | mgronlun |
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date | Mon, 29 Sep 2014 13:12:48 +0200 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2014, 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 size_t current_committed_size = virtual_space()->committed_size(); | |
74 assert((gen_size_limit() >= current_committed_size), | |
75 "generation size limit is wrong"); | |
76 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
77 size_t result = gen_size_limit() - current_committed_size; | |
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78 size_t result_aligned = align_size_down(result, heap->generation_alignment()); |
0 | 79 return result_aligned; |
80 } | |
81 | |
82 // Return the number of bytes the young gen is willing give up. | |
83 // | |
84 // Future implementations could check the survivors and if to_space is in the | |
85 // right place (below from_space), take a chunk from to_space. | |
86 size_t ASPSYoungGen::available_for_contraction() { | |
87 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
88 if (uncommitted_bytes != 0) { | |
89 return uncommitted_bytes; | |
90 } | |
91 | |
92 if (eden_space()->is_empty()) { | |
93 // Respect the minimum size for eden and for the young gen as a whole. | |
94 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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95 const size_t eden_alignment = heap->space_alignment(); |
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96 const size_t gen_alignment = heap->generation_alignment(); |
0 | 97 |
98 assert(eden_space()->capacity_in_bytes() >= eden_alignment, | |
99 "Alignment is wrong"); | |
100 size_t eden_avail = eden_space()->capacity_in_bytes() - eden_alignment; | |
101 eden_avail = align_size_down(eden_avail, gen_alignment); | |
102 | |
103 assert(virtual_space()->committed_size() >= min_gen_size(), | |
104 "minimum gen size is wrong"); | |
105 size_t gen_avail = virtual_space()->committed_size() - min_gen_size(); | |
106 assert(virtual_space()->is_aligned(gen_avail), "not aligned"); | |
107 | |
108 const size_t max_contraction = MIN2(eden_avail, gen_avail); | |
109 // See comment for ASPSOldGen::available_for_contraction() | |
110 // for reasons the "increment" fraction is used. | |
111 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
112 size_t result = policy->eden_increment_aligned_down(max_contraction); | |
113 size_t result_aligned = align_size_down(result, gen_alignment); | |
114 if (PrintAdaptiveSizePolicy && Verbose) { | |
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115 gclog_or_tty->print_cr("ASPSYoungGen::available_for_contraction: " SIZE_FORMAT " K", |
0 | 116 result_aligned/K); |
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117 gclog_or_tty->print_cr(" max_contraction " SIZE_FORMAT " K", max_contraction/K); |
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118 gclog_or_tty->print_cr(" eden_avail " SIZE_FORMAT " K", eden_avail/K); |
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119 gclog_or_tty->print_cr(" gen_avail " SIZE_FORMAT " K", gen_avail/K); |
0 | 120 } |
121 return result_aligned; | |
122 } | |
123 | |
124 return 0; | |
125 } | |
126 | |
127 // The current implementation only considers to the end of eden. | |
128 // If to_space is below from_space, to_space is not considered. | |
129 // to_space can be. | |
130 size_t ASPSYoungGen::available_to_live() { | |
131 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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132 const size_t alignment = heap->space_alignment(); |
0 | 133 |
134 // Include any space that is committed but is not in eden. | |
135 size_t available = pointer_delta(eden_space()->bottom(), | |
136 virtual_space()->low(), | |
137 sizeof(char)); | |
138 | |
139 const size_t eden_capacity = eden_space()->capacity_in_bytes(); | |
140 if (eden_space()->is_empty() && eden_capacity > alignment) { | |
141 available += eden_capacity - alignment; | |
142 } | |
143 return available; | |
144 } | |
145 | |
146 // Similar to PSYoungGen::resize_generation() but | |
147 // allows sum of eden_size and 2 * survivor_size to exceed _max_gen_size | |
148 // expands at the low end of the virtual space | |
149 // moves the boundary between the generations in order to expand | |
150 // some additional diagnostics | |
151 // If no additional changes are required, this can be deleted | |
152 // and the changes factored back into PSYoungGen::resize_generation(). | |
153 bool ASPSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
154 const size_t alignment = virtual_space()->alignment(); | |
155 size_t orig_size = virtual_space()->committed_size(); | |
156 bool size_changed = false; | |
157 | |
158 // There used to be a guarantee here that | |
159 // (eden_size + 2*survivor_size) <= _max_gen_size | |
160 // This requirement is enforced by the calculation of desired_size | |
161 // below. It may not be true on entry since the size of the | |
162 // eden_size is no bounded by the generation size. | |
163 | |
164 assert(max_size() == reserved().byte_size(), "max gen size problem?"); | |
165 assert(min_gen_size() <= orig_size && orig_size <= max_size(), | |
166 "just checking"); | |
167 | |
168 // Adjust new generation size | |
169 const size_t eden_plus_survivors = | |
170 align_size_up(eden_size + 2 * survivor_size, alignment); | |
171 size_t desired_size = MAX2(MIN2(eden_plus_survivors, gen_size_limit()), | |
172 min_gen_size()); | |
173 assert(desired_size <= gen_size_limit(), "just checking"); | |
174 | |
175 if (desired_size > orig_size) { | |
176 // Grow the generation | |
177 size_t change = desired_size - orig_size; | |
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178 HeapWord* prev_low = (HeapWord*) virtual_space()->low(); |
0 | 179 if (!virtual_space()->expand_by(change)) { |
180 return false; | |
181 } | |
263
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182 if (ZapUnusedHeapArea) { |
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183 // Mangle newly committed space immediately because it |
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184 // can be done here more simply that after the new |
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185 // spaces have been computed. |
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186 HeapWord* new_low = (HeapWord*) virtual_space()->low(); |
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187 assert(new_low < prev_low, "Did not grow"); |
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188 |
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189 MemRegion mangle_region(new_low, prev_low); |
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190 SpaceMangler::mangle_region(mangle_region); |
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191 } |
0 | 192 size_changed = true; |
193 } else if (desired_size < orig_size) { | |
194 size_t desired_change = orig_size - desired_size; | |
195 | |
196 // How much is available for shrinking. | |
197 size_t available_bytes = limit_gen_shrink(desired_change); | |
198 size_t change = MIN2(desired_change, available_bytes); | |
199 virtual_space()->shrink_by(change); | |
200 size_changed = true; | |
201 } else { | |
202 if (Verbose && PrintGC) { | |
203 if (orig_size == gen_size_limit()) { | |
204 gclog_or_tty->print_cr("ASPSYoung generation size at maximum: " | |
205 SIZE_FORMAT "K", orig_size/K); | |
206 } else if (orig_size == min_gen_size()) { | |
207 gclog_or_tty->print_cr("ASPSYoung generation size at minium: " | |
208 SIZE_FORMAT "K", orig_size/K); | |
209 } | |
210 } | |
211 } | |
212 | |
213 if (size_changed) { | |
214 reset_after_change(); | |
215 if (Verbose && PrintGC) { | |
216 size_t current_size = virtual_space()->committed_size(); | |
217 gclog_or_tty->print_cr("ASPSYoung generation size changed: " | |
218 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
219 orig_size/K, current_size/K); | |
220 } | |
221 } | |
222 | |
223 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
224 virtual_space()->committed_size() == max_size(), "Sanity"); | |
225 | |
226 return true; | |
227 } | |
228 | |
229 // Similar to PSYoungGen::resize_spaces() but | |
230 // eden always starts at the low end of the committed virtual space | |
231 // current implementation does not allow holes between the spaces | |
232 // _young_generation_boundary has to be reset because it changes. | |
233 // so additional verification | |
263
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234 |
0 | 235 void ASPSYoungGen::resize_spaces(size_t requested_eden_size, |
236 size_t requested_survivor_size) { | |
263
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237 assert(UseAdaptiveSizePolicy, "sanity check"); |
0 | 238 assert(requested_eden_size > 0 && requested_survivor_size > 0, |
239 "just checking"); | |
240 | |
241 space_invariants(); | |
242 | |
243 // We require eden and to space to be empty | |
244 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
245 return; | |
246 } | |
247 | |
248 if (PrintAdaptiveSizePolicy && Verbose) { | |
249 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
250 SIZE_FORMAT | |
251 ", requested_survivor_size: " SIZE_FORMAT ")", | |
252 requested_eden_size, requested_survivor_size); | |
253 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
254 SIZE_FORMAT, | |
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255 p2i(eden_space()->bottom()), |
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256 p2i(eden_space()->end()), |
0 | 257 pointer_delta(eden_space()->end(), |
258 eden_space()->bottom(), | |
259 sizeof(char))); | |
260 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
261 SIZE_FORMAT, | |
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262 p2i(from_space()->bottom()), |
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263 p2i(from_space()->end()), |
0 | 264 pointer_delta(from_space()->end(), |
265 from_space()->bottom(), | |
266 sizeof(char))); | |
267 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
268 SIZE_FORMAT, | |
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269 p2i(to_space()->bottom()), |
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270 p2i(to_space()->end()), |
0 | 271 pointer_delta( to_space()->end(), |
272 to_space()->bottom(), | |
273 sizeof(char))); | |
274 } | |
275 | |
276 // There's nothing to do if the new sizes are the same as the current | |
277 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
278 requested_survivor_size == from_space()->capacity_in_bytes() && | |
279 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
280 if (PrintAdaptiveSizePolicy && Verbose) { | |
281 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
282 } | |
283 return; | |
284 } | |
285 | |
286 char* eden_start = (char*)virtual_space()->low(); | |
287 char* eden_end = (char*)eden_space()->end(); | |
288 char* from_start = (char*)from_space()->bottom(); | |
289 char* from_end = (char*)from_space()->end(); | |
290 char* to_start = (char*)to_space()->bottom(); | |
291 char* to_end = (char*)to_space()->end(); | |
292 | |
293 assert(eden_start < from_start, "Cannot push into from_space"); | |
294 | |
295 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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296 const size_t alignment = heap->space_alignment(); |
263
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297 const bool maintain_minimum = |
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298 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); |
0 | 299 |
263
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300 bool eden_from_to_order = from_start < to_start; |
0 | 301 // Check whether from space is below to space |
263
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302 if (eden_from_to_order) { |
0 | 303 // Eden, from, to |
263
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304 |
0 | 305 if (PrintAdaptiveSizePolicy && Verbose) { |
306 gclog_or_tty->print_cr(" Eden, from, to:"); | |
307 } | |
308 | |
309 // Set eden | |
263
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310 // "requested_eden_size" is a goal for the size of eden |
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311 // and may not be attainable. "eden_size" below is |
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312 // calculated based on the location of from-space and |
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313 // the goal for the size of eden. from-space is |
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314 // fixed in place because it contains live data. |
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315 // The calculation is done this way to avoid 32bit |
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316 // overflow (i.e., eden_start + requested_eden_size |
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317 // may too large for representation in 32bits). |
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318 size_t eden_size; |
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319 if (maintain_minimum) { |
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320 // Only make eden larger than the requested size if |
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321 // the minimum size of the generation has to be maintained. |
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322 // This could be done in general but policy at a higher |
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323 // level is determining a requested size for eden and that |
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324 // should be honored unless there is a fundamental reason. |
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325 eden_size = pointer_delta(from_start, |
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326 eden_start, |
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327 sizeof(char)); |
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328 } else { |
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329 eden_size = MIN2(requested_eden_size, |
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330 pointer_delta(from_start, eden_start, sizeof(char))); |
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331 } |
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332 |
0 | 333 eden_end = eden_start + eden_size; |
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334 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 335 |
336 // To may resize into from space as long as it is clear of live data. | |
337 // From space must remain page aligned, though, so we need to do some | |
338 // extra calculations. | |
339 | |
340 // First calculate an optimal to-space | |
341 to_end = (char*)virtual_space()->high(); | |
342 to_start = (char*)pointer_delta(to_end, | |
343 (char*)requested_survivor_size, | |
344 sizeof(char)); | |
345 | |
346 // Does the optimal to-space overlap from-space? | |
347 if (to_start < (char*)from_space()->end()) { | |
348 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
349 | |
350 // Calculate the minimum offset possible for from_end | |
351 size_t from_size = | |
352 pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
353 | |
354 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
355 if (from_size == 0) { | |
356 from_size = alignment; | |
357 } else { | |
358 from_size = align_size_up(from_size, alignment); | |
359 } | |
360 | |
361 from_end = from_start + from_size; | |
362 assert(from_end > from_start, "addition overflow or from_size problem"); | |
363 | |
364 guarantee(from_end <= (char*)from_space()->end(), | |
365 "from_end moved to the right"); | |
366 | |
367 // Now update to_start with the new from_end | |
368 to_start = MAX2(from_end, to_start); | |
369 } | |
370 | |
371 guarantee(to_start != to_end, "to space is zero sized"); | |
372 | |
373 if (PrintAdaptiveSizePolicy && Verbose) { | |
374 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
375 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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376 p2i(eden_start), |
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377 p2i(eden_end), |
0 | 378 pointer_delta(eden_end, eden_start, sizeof(char))); |
379 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
380 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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381 p2i(from_start), |
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382 p2i(from_end), |
0 | 383 pointer_delta(from_end, from_start, sizeof(char))); |
384 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
385 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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386 p2i(to_start), |
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387 p2i(to_end), |
0 | 388 pointer_delta( to_end, to_start, sizeof(char))); |
389 } | |
390 } else { | |
391 // Eden, to, from | |
392 if (PrintAdaptiveSizePolicy && Verbose) { | |
393 gclog_or_tty->print_cr(" Eden, to, from:"); | |
394 } | |
395 | |
396 // To space gets priority over eden resizing. Note that we position | |
397 // to space as if we were able to resize from space, even though from | |
398 // space is not modified. | |
399 // Giving eden priority was tried and gave poorer performance. | |
400 to_end = (char*)pointer_delta(virtual_space()->high(), | |
401 (char*)requested_survivor_size, | |
402 sizeof(char)); | |
403 to_end = MIN2(to_end, from_start); | |
404 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
405 sizeof(char)); | |
406 // if the space sizes are to be increased by several times then | |
407 // 'to_start' will point beyond the young generation. In this case | |
408 // 'to_start' should be adjusted. | |
409 to_start = MAX2(to_start, eden_start + alignment); | |
410 | |
411 // Compute how big eden can be, then adjust end. | |
263
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412 // See comments above on calculating eden_end. |
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413 size_t eden_size; |
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414 if (maintain_minimum) { |
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415 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); |
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416 } else { |
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417 eden_size = MIN2(requested_eden_size, |
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418 pointer_delta(to_start, eden_start, sizeof(char))); |
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419 } |
0 | 420 eden_end = eden_start + eden_size; |
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421 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 422 |
423 // Don't let eden shrink down to 0 or less. | |
424 eden_end = MAX2(eden_end, eden_start + alignment); | |
425 to_start = MAX2(to_start, eden_end); | |
426 | |
427 if (PrintAdaptiveSizePolicy && Verbose) { | |
428 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
429 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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430 p2i(eden_start), |
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431 p2i(eden_end), |
0 | 432 pointer_delta(eden_end, eden_start, sizeof(char))); |
433 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
434 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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435 p2i(to_start), |
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436 p2i(to_end), |
0 | 437 pointer_delta( to_end, to_start, sizeof(char))); |
438 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
439 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
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440 p2i(from_start), |
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441 p2i(from_end), |
0 | 442 pointer_delta(from_end, from_start, sizeof(char))); |
443 } | |
444 } | |
445 | |
446 | |
447 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
448 "from start moved to the right"); | |
449 guarantee((HeapWord*)from_end >= from_space()->top(), | |
450 "from end moved into live data"); | |
451 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
452 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
453 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
454 | |
455 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
456 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
457 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
458 | |
459 // Let's make sure the call to initialize doesn't reset "top"! | |
460 DEBUG_ONLY(HeapWord* old_from_top = from_space()->top();) | |
461 | |
462 // For PrintAdaptiveSizePolicy block below | |
463 size_t old_from = from_space()->capacity_in_bytes(); | |
464 size_t old_to = to_space()->capacity_in_bytes(); | |
465 | |
263
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466 if (ZapUnusedHeapArea) { |
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467 // NUMA is a special case because a numa space is not mangled |
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468 // in order to not prematurely bind its address to memory to |
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469 // the wrong memory (i.e., don't want the GC thread to first |
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470 // touch the memory). The survivor spaces are not numa |
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471 // spaces and are mangled. |
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472 if (UseNUMA) { |
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473 if (eden_from_to_order) { |
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474 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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475 } else { |
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476 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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477 } |
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478 } |
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479 |
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480 // If not mangling the spaces, do some checking to verify that |
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481 // the spaces are already mangled. |
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482 // The spaces should be correctly mangled at this point so |
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483 // do some checking here. Note that they are not being mangled |
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484 // in the calls to initialize(). |
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485 // Must check mangling before the spaces are reshaped. Otherwise, |
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486 // the bottom or end of one space may have moved into an area |
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487 // covered by another space and a failure of the check may |
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488 // not correctly indicate which space is not properly mangled. |
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489 |
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490 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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491 eden_space()->check_mangled_unused_area(limit); |
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492 from_space()->check_mangled_unused_area(limit); |
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493 to_space()->check_mangled_unused_area(limit); |
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494 } |
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495 // When an existing space is being initialized, it is not |
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496 // mangled because the space has been previously mangled. |
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497 eden_space()->initialize(edenMR, |
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498 SpaceDecorator::Clear, |
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499 SpaceDecorator::DontMangle); |
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500 to_space()->initialize(toMR, |
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501 SpaceDecorator::Clear, |
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502 SpaceDecorator::DontMangle); |
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503 from_space()->initialize(fromMR, |
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504 SpaceDecorator::DontClear, |
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505 SpaceDecorator::DontMangle); |
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506 |
0 | 507 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
508 | |
509 assert(from_space()->top() == old_from_top, "from top changed!"); | |
510 | |
511 if (PrintAdaptiveSizePolicy) { | |
512 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
513 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
514 | |
515 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
516 "collection: %d " | |
517 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
518 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
519 heap->total_collections(), | |
520 old_from, old_to, | |
521 from_space()->capacity_in_bytes(), | |
522 to_space()->capacity_in_bytes()); | |
523 gclog_or_tty->cr(); | |
524 } | |
525 space_invariants(); | |
526 } | |
527 void ASPSYoungGen::reset_after_change() { | |
528 assert_locked_or_safepoint(Heap_lock); | |
529 | |
530 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
531 (HeapWord*)virtual_space()->high_boundary()); | |
532 PSScavenge::reference_processor()->set_span(_reserved); | |
533 | |
534 HeapWord* new_eden_bottom = (HeapWord*)virtual_space()->low(); | |
535 HeapWord* eden_bottom = eden_space()->bottom(); | |
536 if (new_eden_bottom != eden_bottom) { | |
537 MemRegion eden_mr(new_eden_bottom, eden_space()->end()); | |
263
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538 eden_space()->initialize(eden_mr, |
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539 SpaceDecorator::Clear, |
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540 SpaceDecorator::Mangle); |
0 | 541 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
542 } | |
543 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
544 (HeapWord*)virtual_space()->high()); | |
545 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
546 | |
547 space_invariants(); | |
548 } |