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annotate src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
author | mikael |
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date | Tue, 24 Dec 2013 11:48:39 -0800 |
parents | 8f07aa079343 |
children | 63a4eb8bcd23 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 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 * | |
1552
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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/parallelScavengeHeap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
28 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
29 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" | |
30 #include "gc_implementation/shared/gcUtil.hpp" | |
31 #include "gc_implementation/shared/mutableNUMASpace.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "oops/oop.inline.hpp" | |
34 #include "runtime/java.hpp" | |
0 | 35 |
36 PSYoungGen::PSYoungGen(size_t initial_size, | |
37 size_t min_size, | |
38 size_t max_size) : | |
39 _init_gen_size(initial_size), | |
40 _min_gen_size(min_size), | |
41 _max_gen_size(max_size) | |
42 {} | |
43 | |
44 void PSYoungGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
45 assert(_init_gen_size != 0, "Should have a finite size"); | |
46 _virtual_space = new PSVirtualSpace(rs, alignment); | |
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47 if (!virtual_space()->expand_by(_init_gen_size)) { |
0 | 48 vm_exit_during_initialization("Could not reserve enough space for " |
49 "object heap"); | |
50 } | |
51 } | |
52 | |
53 void PSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
54 initialize_virtual_space(rs, alignment); | |
55 initialize_work(); | |
56 } | |
57 | |
58 void PSYoungGen::initialize_work() { | |
59 | |
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60 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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61 (HeapWord*)virtual_space()->high_boundary()); |
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62 |
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63 MemRegion cmr((HeapWord*)virtual_space()->low(), |
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64 (HeapWord*)virtual_space()->high()); |
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65 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
0 | 66 |
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67 if (ZapUnusedHeapArea) { |
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68 // Mangle newly committed space immediately because it |
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69 // can be done here more simply that after the new |
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70 // spaces have been computed. |
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71 SpaceMangler::mangle_region(cmr); |
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72 } |
0 | 73 |
74 if (UseNUMA) { | |
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75 _eden_space = new MutableNUMASpace(virtual_space()->alignment()); |
0 | 76 } else { |
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77 _eden_space = new MutableSpace(virtual_space()->alignment()); |
0 | 78 } |
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79 _from_space = new MutableSpace(virtual_space()->alignment()); |
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80 _to_space = new MutableSpace(virtual_space()->alignment()); |
0 | 81 |
82 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { | |
83 vm_exit_during_initialization("Could not allocate a young gen space"); | |
84 } | |
85 | |
86 // Allocate the mark sweep views of spaces | |
87 _eden_mark_sweep = | |
88 new PSMarkSweepDecorator(_eden_space, NULL, MarkSweepDeadRatio); | |
89 _from_mark_sweep = | |
90 new PSMarkSweepDecorator(_from_space, NULL, MarkSweepDeadRatio); | |
91 _to_mark_sweep = | |
92 new PSMarkSweepDecorator(_to_space, NULL, MarkSweepDeadRatio); | |
93 | |
94 if (_eden_mark_sweep == NULL || | |
95 _from_mark_sweep == NULL || | |
96 _to_mark_sweep == NULL) { | |
97 vm_exit_during_initialization("Could not complete allocation" | |
98 " of the young generation"); | |
99 } | |
100 | |
101 // Generation Counters - generation 0, 3 subspaces | |
102 _gen_counters = new PSGenerationCounters("new", 0, 3, _virtual_space); | |
103 | |
104 // Compute maximum space sizes for performance counters | |
105 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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106 size_t alignment = heap->space_alignment(); |
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107 size_t size = virtual_space()->reserved_size(); |
0 | 108 |
109 size_t max_survivor_size; | |
110 size_t max_eden_size; | |
111 | |
112 if (UseAdaptiveSizePolicy) { | |
113 max_survivor_size = size / MinSurvivorRatio; | |
114 | |
115 // round the survivor space size down to the nearest alignment | |
116 // and make sure its size is greater than 0. | |
117 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
118 max_survivor_size = MAX2(max_survivor_size, alignment); | |
119 | |
120 // set the maximum size of eden to be the size of the young gen | |
121 // less two times the minimum survivor size. The minimum survivor | |
122 // size for UseAdaptiveSizePolicy is one alignment. | |
123 max_eden_size = size - 2 * alignment; | |
124 } else { | |
125 max_survivor_size = size / InitialSurvivorRatio; | |
126 | |
127 // round the survivor space size down to the nearest alignment | |
128 // and make sure its size is greater than 0. | |
129 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
130 max_survivor_size = MAX2(max_survivor_size, alignment); | |
131 | |
132 // set the maximum size of eden to be the size of the young gen | |
133 // less two times the survivor size when the generation is 100% | |
134 // committed. The minimum survivor size for -UseAdaptiveSizePolicy | |
135 // is dependent on the committed portion (current capacity) of the | |
136 // generation - the less space committed, the smaller the survivor | |
137 // space, possibly as small as an alignment. However, we are interested | |
138 // in the case where the young generation is 100% committed, as this | |
139 // is the point where eden reachs its maximum size. At this point, | |
140 // the size of a survivor space is max_survivor_size. | |
141 max_eden_size = size - 2 * max_survivor_size; | |
142 } | |
143 | |
144 _eden_counters = new SpaceCounters("eden", 0, max_eden_size, _eden_space, | |
145 _gen_counters); | |
146 _from_counters = new SpaceCounters("s0", 1, max_survivor_size, _from_space, | |
147 _gen_counters); | |
148 _to_counters = new SpaceCounters("s1", 2, max_survivor_size, _to_space, | |
149 _gen_counters); | |
150 | |
151 compute_initial_space_boundaries(); | |
152 } | |
153 | |
154 void PSYoungGen::compute_initial_space_boundaries() { | |
155 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
156 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
157 | |
158 // Compute sizes | |
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159 size_t alignment = heap->space_alignment(); |
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160 size_t size = virtual_space()->committed_size(); |
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161 assert(size >= 3 * alignment, "Young space is not large enough for eden + 2 survivors"); |
0 | 162 |
163 size_t survivor_size = size / InitialSurvivorRatio; | |
164 survivor_size = align_size_down(survivor_size, alignment); | |
165 // ... but never less than an alignment | |
166 survivor_size = MAX2(survivor_size, alignment); | |
167 | |
168 // Young generation is eden + 2 survivor spaces | |
169 size_t eden_size = size - (2 * survivor_size); | |
170 | |
171 // Now go ahead and set 'em. | |
172 set_space_boundaries(eden_size, survivor_size); | |
173 space_invariants(); | |
174 | |
175 if (UsePerfData) { | |
176 _eden_counters->update_capacity(); | |
177 _from_counters->update_capacity(); | |
178 _to_counters->update_capacity(); | |
179 } | |
180 } | |
181 | |
182 void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) { | |
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183 assert(eden_size < virtual_space()->committed_size(), "just checking"); |
0 | 184 assert(eden_size > 0 && survivor_size > 0, "just checking"); |
185 | |
186 // Initial layout is Eden, to, from. After swapping survivor spaces, | |
187 // that leaves us with Eden, from, to, which is step one in our two | |
188 // step resize-with-live-data procedure. | |
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189 char *eden_start = virtual_space()->low(); |
0 | 190 char *to_start = eden_start + eden_size; |
191 char *from_start = to_start + survivor_size; | |
192 char *from_end = from_start + survivor_size; | |
193 | |
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194 assert(from_end == virtual_space()->high(), "just checking"); |
0 | 195 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
196 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
197 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
198 | |
199 MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start); | |
200 MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start); | |
201 MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end); | |
202 | |
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203 eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea); |
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204 to_space()->initialize(to_mr , true, ZapUnusedHeapArea); |
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205 from_space()->initialize(from_mr, true, ZapUnusedHeapArea); |
0 | 206 } |
207 | |
208 #ifndef PRODUCT | |
209 void PSYoungGen::space_invariants() { | |
210 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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211 const size_t alignment = heap->space_alignment(); |
0 | 212 |
213 // Currently, our eden size cannot shrink to zero | |
214 guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small"); | |
215 guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small"); | |
216 guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small"); | |
217 | |
218 // Relationship of spaces to each other | |
219 char* eden_start = (char*)eden_space()->bottom(); | |
220 char* eden_end = (char*)eden_space()->end(); | |
221 char* from_start = (char*)from_space()->bottom(); | |
222 char* from_end = (char*)from_space()->end(); | |
223 char* to_start = (char*)to_space()->bottom(); | |
224 char* to_end = (char*)to_space()->end(); | |
225 | |
263
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226 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); |
0 | 227 guarantee(eden_start < eden_end, "eden space consistency"); |
228 guarantee(from_start < from_end, "from space consistency"); | |
229 guarantee(to_start < to_end, "to space consistency"); | |
230 | |
231 // Check whether from space is below to space | |
232 if (from_start < to_start) { | |
233 // Eden, from, to | |
234 guarantee(eden_end <= from_start, "eden/from boundary"); | |
235 guarantee(from_end <= to_start, "from/to boundary"); | |
263
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236 guarantee(to_end <= virtual_space()->high(), "to end"); |
0 | 237 } else { |
238 // Eden, to, from | |
239 guarantee(eden_end <= to_start, "eden/to boundary"); | |
240 guarantee(to_end <= from_start, "to/from boundary"); | |
263
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241 guarantee(from_end <= virtual_space()->high(), "from end"); |
0 | 242 } |
243 | |
244 // More checks that the virtual space is consistent with the spaces | |
263
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245 assert(virtual_space()->committed_size() >= |
0 | 246 (eden_space()->capacity_in_bytes() + |
247 to_space()->capacity_in_bytes() + | |
248 from_space()->capacity_in_bytes()), "Committed size is inconsistent"); | |
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249 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
0 | 250 "Space invariant"); |
251 char* eden_top = (char*)eden_space()->top(); | |
252 char* from_top = (char*)from_space()->top(); | |
253 char* to_top = (char*)to_space()->top(); | |
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254 assert(eden_top <= virtual_space()->high(), "eden top"); |
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255 assert(from_top <= virtual_space()->high(), "from top"); |
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256 assert(to_top <= virtual_space()->high(), "to top"); |
0 | 257 |
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258 virtual_space()->verify(); |
0 | 259 } |
260 #endif | |
261 | |
262 void PSYoungGen::resize(size_t eden_size, size_t survivor_size) { | |
263 // Resize the generation if needed. If the generation resize | |
264 // reports false, do not attempt to resize the spaces. | |
265 if (resize_generation(eden_size, survivor_size)) { | |
266 // Then we lay out the spaces inside the generation | |
267 resize_spaces(eden_size, survivor_size); | |
268 | |
269 space_invariants(); | |
270 | |
271 if (PrintAdaptiveSizePolicy && Verbose) { | |
272 gclog_or_tty->print_cr("Young generation size: " | |
273 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
274 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
275 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
276 eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(), | |
277 _max_gen_size, min_gen_size()); | |
278 } | |
279 } | |
280 } | |
281 | |
282 | |
283 bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
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284 const size_t alignment = virtual_space()->alignment(); |
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285 size_t orig_size = virtual_space()->committed_size(); |
0 | 286 bool size_changed = false; |
287 | |
288 // There used to be this guarantee there. | |
289 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
290 // Code below forces this requirement. In addition the desired eden | |
291 // size and disired survivor sizes are desired goals and may | |
292 // exceed the total generation size. | |
293 | |
294 assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking"); | |
295 | |
296 // Adjust new generation size | |
297 const size_t eden_plus_survivors = | |
298 align_size_up(eden_size + 2 * survivor_size, alignment); | |
299 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()), | |
300 min_gen_size()); | |
301 assert(desired_size <= max_size(), "just checking"); | |
302 | |
303 if (desired_size > orig_size) { | |
304 // Grow the generation | |
305 size_t change = desired_size - orig_size; | |
306 assert(change % alignment == 0, "just checking"); | |
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307 HeapWord* prev_high = (HeapWord*) virtual_space()->high(); |
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308 if (!virtual_space()->expand_by(change)) { |
0 | 309 return false; // Error if we fail to resize! |
310 } | |
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311 if (ZapUnusedHeapArea) { |
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312 // Mangle newly committed space immediately because it |
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313 // can be done here more simply that after the new |
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314 // spaces have been computed. |
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315 HeapWord* new_high = (HeapWord*) virtual_space()->high(); |
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316 MemRegion mangle_region(prev_high, new_high); |
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317 SpaceMangler::mangle_region(mangle_region); |
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318 } |
0 | 319 size_changed = true; |
320 } else if (desired_size < orig_size) { | |
321 size_t desired_change = orig_size - desired_size; | |
322 assert(desired_change % alignment == 0, "just checking"); | |
323 | |
324 desired_change = limit_gen_shrink(desired_change); | |
325 | |
326 if (desired_change > 0) { | |
327 virtual_space()->shrink_by(desired_change); | |
328 reset_survivors_after_shrink(); | |
329 | |
330 size_changed = true; | |
331 } | |
332 } else { | |
333 if (Verbose && PrintGC) { | |
334 if (orig_size == gen_size_limit()) { | |
335 gclog_or_tty->print_cr("PSYoung generation size at maximum: " | |
336 SIZE_FORMAT "K", orig_size/K); | |
337 } else if (orig_size == min_gen_size()) { | |
338 gclog_or_tty->print_cr("PSYoung generation size at minium: " | |
339 SIZE_FORMAT "K", orig_size/K); | |
340 } | |
341 } | |
342 } | |
343 | |
344 if (size_changed) { | |
345 post_resize(); | |
346 | |
347 if (Verbose && PrintGC) { | |
263
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348 size_t current_size = virtual_space()->committed_size(); |
0 | 349 gclog_or_tty->print_cr("PSYoung generation size changed: " |
350 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
351 orig_size/K, current_size/K); | |
352 } | |
353 } | |
354 | |
263
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355 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || |
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356 virtual_space()->committed_size() == max_size(), "Sanity"); |
0 | 357 |
358 return true; | |
359 } | |
360 | |
263
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361 #ifndef PRODUCT |
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362 // In the numa case eden is not mangled so a survivor space |
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363 // moving into a region previously occupied by a survivor |
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364 // may find an unmangled region. Also in the PS case eden |
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365 // to-space and from-space may not touch (i.e., there may be |
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366 // gaps between them due to movement while resizing the |
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367 // spaces). Those gaps must be mangled. |
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368 void PSYoungGen::mangle_survivors(MutableSpace* s1, |
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369 MemRegion s1MR, |
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370 MutableSpace* s2, |
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371 MemRegion s2MR) { |
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372 // Check eden and gap between eden and from-space, in deciding |
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373 // what to mangle in from-space. Check the gap between from-space |
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374 // and to-space when deciding what to mangle. |
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375 // |
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376 // +--------+ +----+ +---+ |
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377 // | eden | |s1 | |s2 | |
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378 // +--------+ +----+ +---+ |
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379 // +-------+ +-----+ |
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380 // |s1MR | |s2MR | |
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381 // +-------+ +-----+ |
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382 // All of survivor-space is properly mangled so find the |
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383 // upper bound on the mangling for any portion above current s1. |
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384 HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end()); |
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385 MemRegion delta1_left; |
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386 if (s1MR.start() < delta_end) { |
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387 delta1_left = MemRegion(s1MR.start(), delta_end); |
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388 s1->mangle_region(delta1_left); |
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389 } |
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390 // Find any portion to the right of the current s1. |
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391 HeapWord* delta_start = MAX2(s1->end(), s1MR.start()); |
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392 MemRegion delta1_right; |
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393 if (delta_start < s1MR.end()) { |
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394 delta1_right = MemRegion(delta_start, s1MR.end()); |
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395 s1->mangle_region(delta1_right); |
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396 } |
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397 |
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398 // Similarly for the second survivor space except that |
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399 // any of the new region that overlaps with the current |
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400 // region of the first survivor space has already been |
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401 // mangled. |
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402 delta_end = MIN2(s2->bottom(), s2MR.end()); |
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403 delta_start = MAX2(s2MR.start(), s1->end()); |
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404 MemRegion delta2_left; |
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405 if (s2MR.start() < delta_end) { |
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406 delta2_left = MemRegion(s2MR.start(), delta_end); |
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407 s2->mangle_region(delta2_left); |
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408 } |
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409 delta_start = MAX2(s2->end(), s2MR.start()); |
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410 MemRegion delta2_right; |
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411 if (delta_start < s2MR.end()) { |
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412 s2->mangle_region(delta2_right); |
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413 } |
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414 |
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415 if (TraceZapUnusedHeapArea) { |
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416 // s1 |
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417 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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418 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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419 s1->bottom(), s1->end(), s1MR.start(), s1MR.end()); |
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420 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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421 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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422 delta1_left.start(), delta1_left.end(), delta1_right.start(), |
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423 delta1_right.end()); |
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424 |
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425 // s2 |
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426 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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427 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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428 s2->bottom(), s2->end(), s2MR.start(), s2MR.end()); |
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429 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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430 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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431 delta2_left.start(), delta2_left.end(), delta2_right.start(), |
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432 delta2_right.end()); |
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433 } |
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434 |
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435 } |
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436 #endif // NOT PRODUCT |
0 | 437 |
438 void PSYoungGen::resize_spaces(size_t requested_eden_size, | |
439 size_t requested_survivor_size) { | |
440 assert(UseAdaptiveSizePolicy, "sanity check"); | |
441 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
442 "just checking"); | |
443 | |
444 // We require eden and to space to be empty | |
445 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
446 return; | |
447 } | |
448 | |
449 if (PrintAdaptiveSizePolicy && Verbose) { | |
450 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
451 SIZE_FORMAT | |
452 ", requested_survivor_size: " SIZE_FORMAT ")", | |
453 requested_eden_size, requested_survivor_size); | |
454 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
455 SIZE_FORMAT, | |
456 eden_space()->bottom(), | |
457 eden_space()->end(), | |
458 pointer_delta(eden_space()->end(), | |
459 eden_space()->bottom(), | |
460 sizeof(char))); | |
461 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
462 SIZE_FORMAT, | |
463 from_space()->bottom(), | |
464 from_space()->end(), | |
465 pointer_delta(from_space()->end(), | |
466 from_space()->bottom(), | |
467 sizeof(char))); | |
468 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
469 SIZE_FORMAT, | |
470 to_space()->bottom(), | |
471 to_space()->end(), | |
472 pointer_delta( to_space()->end(), | |
473 to_space()->bottom(), | |
474 sizeof(char))); | |
475 } | |
476 | |
477 // There's nothing to do if the new sizes are the same as the current | |
478 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
479 requested_survivor_size == from_space()->capacity_in_bytes() && | |
480 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
481 if (PrintAdaptiveSizePolicy && Verbose) { | |
482 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
483 } | |
484 return; | |
485 } | |
486 | |
487 char* eden_start = (char*)eden_space()->bottom(); | |
488 char* eden_end = (char*)eden_space()->end(); | |
489 char* from_start = (char*)from_space()->bottom(); | |
490 char* from_end = (char*)from_space()->end(); | |
491 char* to_start = (char*)to_space()->bottom(); | |
492 char* to_end = (char*)to_space()->end(); | |
493 | |
494 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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495 const size_t alignment = heap->space_alignment(); |
0 | 496 const bool maintain_minimum = |
497 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
498 | |
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499 bool eden_from_to_order = from_start < to_start; |
0 | 500 // Check whether from space is below to space |
263
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501 if (eden_from_to_order) { |
0 | 502 // Eden, from, to |
263
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503 eden_from_to_order = true; |
0 | 504 if (PrintAdaptiveSizePolicy && Verbose) { |
505 gclog_or_tty->print_cr(" Eden, from, to:"); | |
506 } | |
507 | |
508 // Set eden | |
509 // "requested_eden_size" is a goal for the size of eden | |
510 // and may not be attainable. "eden_size" below is | |
511 // calculated based on the location of from-space and | |
512 // the goal for the size of eden. from-space is | |
513 // fixed in place because it contains live data. | |
514 // The calculation is done this way to avoid 32bit | |
515 // overflow (i.e., eden_start + requested_eden_size | |
516 // may too large for representation in 32bits). | |
517 size_t eden_size; | |
518 if (maintain_minimum) { | |
519 // Only make eden larger than the requested size if | |
520 // the minimum size of the generation has to be maintained. | |
521 // This could be done in general but policy at a higher | |
522 // level is determining a requested size for eden and that | |
523 // should be honored unless there is a fundamental reason. | |
524 eden_size = pointer_delta(from_start, | |
525 eden_start, | |
526 sizeof(char)); | |
527 } else { | |
528 eden_size = MIN2(requested_eden_size, | |
529 pointer_delta(from_start, eden_start, sizeof(char))); | |
530 } | |
531 | |
532 eden_end = eden_start + eden_size; | |
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533 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 534 |
535 // To may resize into from space as long as it is clear of live data. | |
536 // From space must remain page aligned, though, so we need to do some | |
537 // extra calculations. | |
538 | |
539 // First calculate an optimal to-space | |
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540 to_end = (char*)virtual_space()->high(); |
0 | 541 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
542 sizeof(char)); | |
543 | |
544 // Does the optimal to-space overlap from-space? | |
545 if (to_start < (char*)from_space()->end()) { | |
546 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
547 | |
548 // Calculate the minimum offset possible for from_end | |
549 size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
550 | |
551 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
552 if (from_size == 0) { | |
553 from_size = alignment; | |
554 } else { | |
555 from_size = align_size_up(from_size, alignment); | |
556 } | |
557 | |
558 from_end = from_start + from_size; | |
559 assert(from_end > from_start, "addition overflow or from_size problem"); | |
560 | |
561 guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right"); | |
562 | |
563 // Now update to_start with the new from_end | |
564 to_start = MAX2(from_end, to_start); | |
565 } | |
566 | |
567 guarantee(to_start != to_end, "to space is zero sized"); | |
568 | |
569 if (PrintAdaptiveSizePolicy && Verbose) { | |
570 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
571 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
572 eden_start, | |
573 eden_end, | |
574 pointer_delta(eden_end, eden_start, sizeof(char))); | |
575 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
576 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
577 from_start, | |
578 from_end, | |
579 pointer_delta(from_end, from_start, sizeof(char))); | |
580 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
581 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
582 to_start, | |
583 to_end, | |
584 pointer_delta( to_end, to_start, sizeof(char))); | |
585 } | |
586 } else { | |
587 // Eden, to, from | |
588 if (PrintAdaptiveSizePolicy && Verbose) { | |
589 gclog_or_tty->print_cr(" Eden, to, from:"); | |
590 } | |
591 | |
592 // To space gets priority over eden resizing. Note that we position | |
593 // to space as if we were able to resize from space, even though from | |
594 // space is not modified. | |
595 // Giving eden priority was tried and gave poorer performance. | |
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596 to_end = (char*)pointer_delta(virtual_space()->high(), |
0 | 597 (char*)requested_survivor_size, |
598 sizeof(char)); | |
599 to_end = MIN2(to_end, from_start); | |
600 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
601 sizeof(char)); | |
602 // if the space sizes are to be increased by several times then | |
603 // 'to_start' will point beyond the young generation. In this case | |
604 // 'to_start' should be adjusted. | |
605 to_start = MAX2(to_start, eden_start + alignment); | |
606 | |
607 // Compute how big eden can be, then adjust end. | |
608 // See comments above on calculating eden_end. | |
609 size_t eden_size; | |
610 if (maintain_minimum) { | |
611 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); | |
612 } else { | |
613 eden_size = MIN2(requested_eden_size, | |
614 pointer_delta(to_start, eden_start, sizeof(char))); | |
615 } | |
616 eden_end = eden_start + eden_size; | |
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617 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 618 |
619 // Could choose to not let eden shrink | |
620 // to_start = MAX2(to_start, eden_end); | |
621 | |
622 // Don't let eden shrink down to 0 or less. | |
623 eden_end = MAX2(eden_end, eden_start + alignment); | |
624 to_start = MAX2(to_start, eden_end); | |
625 | |
626 if (PrintAdaptiveSizePolicy && Verbose) { | |
627 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
628 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
629 eden_start, | |
630 eden_end, | |
631 pointer_delta(eden_end, eden_start, sizeof(char))); | |
632 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
633 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
634 to_start, | |
635 to_end, | |
636 pointer_delta( to_end, to_start, sizeof(char))); | |
637 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
638 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
639 from_start, | |
640 from_end, | |
641 pointer_delta(from_end, from_start, sizeof(char))); | |
642 } | |
643 } | |
644 | |
645 | |
646 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
647 "from start moved to the right"); | |
648 guarantee((HeapWord*)from_end >= from_space()->top(), | |
649 "from end moved into live data"); | |
650 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
651 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
652 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
653 | |
654 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
655 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
656 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
657 | |
658 // Let's make sure the call to initialize doesn't reset "top"! | |
659 HeapWord* old_from_top = from_space()->top(); | |
660 | |
661 // For PrintAdaptiveSizePolicy block below | |
662 size_t old_from = from_space()->capacity_in_bytes(); | |
663 size_t old_to = to_space()->capacity_in_bytes(); | |
664 | |
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665 if (ZapUnusedHeapArea) { |
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666 // NUMA is a special case because a numa space is not mangled |
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667 // in order to not prematurely bind its address to memory to |
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668 // the wrong memory (i.e., don't want the GC thread to first |
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669 // touch the memory). The survivor spaces are not numa |
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670 // spaces and are mangled. |
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671 if (UseNUMA) { |
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672 if (eden_from_to_order) { |
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673 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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674 } else { |
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675 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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676 } |
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677 } |
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678 |
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679 // If not mangling the spaces, do some checking to verify that |
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680 // the spaces are already mangled. |
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681 // The spaces should be correctly mangled at this point so |
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682 // do some checking here. Note that they are not being mangled |
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683 // in the calls to initialize(). |
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684 // Must check mangling before the spaces are reshaped. Otherwise, |
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685 // the bottom or end of one space may have moved into an area |
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686 // covered by another space and a failure of the check may |
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687 // not correctly indicate which space is not properly mangled. |
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688 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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689 eden_space()->check_mangled_unused_area(limit); |
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690 from_space()->check_mangled_unused_area(limit); |
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691 to_space()->check_mangled_unused_area(limit); |
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692 } |
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693 // When an existing space is being initialized, it is not |
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694 // mangled because the space has been previously mangled. |
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695 eden_space()->initialize(edenMR, |
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696 SpaceDecorator::Clear, |
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697 SpaceDecorator::DontMangle); |
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698 to_space()->initialize(toMR, |
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699 SpaceDecorator::Clear, |
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700 SpaceDecorator::DontMangle); |
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701 from_space()->initialize(fromMR, |
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702 SpaceDecorator::DontClear, |
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703 SpaceDecorator::DontMangle); |
0 | 704 |
705 assert(from_space()->top() == old_from_top, "from top changed!"); | |
706 | |
707 if (PrintAdaptiveSizePolicy) { | |
708 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
709 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
710 | |
711 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
712 "collection: %d " | |
713 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
714 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
715 heap->total_collections(), | |
716 old_from, old_to, | |
717 from_space()->capacity_in_bytes(), | |
718 to_space()->capacity_in_bytes()); | |
719 gclog_or_tty->cr(); | |
720 } | |
721 } | |
722 | |
723 void PSYoungGen::swap_spaces() { | |
724 MutableSpace* s = from_space(); | |
725 _from_space = to_space(); | |
726 _to_space = s; | |
727 | |
728 // Now update the decorators. | |
729 PSMarkSweepDecorator* md = from_mark_sweep(); | |
730 _from_mark_sweep = to_mark_sweep(); | |
731 _to_mark_sweep = md; | |
732 | |
733 assert(from_mark_sweep()->space() == from_space(), "Sanity"); | |
734 assert(to_mark_sweep()->space() == to_space(), "Sanity"); | |
735 } | |
736 | |
737 size_t PSYoungGen::capacity_in_bytes() const { | |
738 return eden_space()->capacity_in_bytes() | |
739 + from_space()->capacity_in_bytes(); // to_space() is only used during scavenge | |
740 } | |
741 | |
742 | |
743 size_t PSYoungGen::used_in_bytes() const { | |
744 return eden_space()->used_in_bytes() | |
745 + from_space()->used_in_bytes(); // to_space() is only used during scavenge | |
746 } | |
747 | |
748 | |
749 size_t PSYoungGen::free_in_bytes() const { | |
750 return eden_space()->free_in_bytes() | |
751 + from_space()->free_in_bytes(); // to_space() is only used during scavenge | |
752 } | |
753 | |
754 size_t PSYoungGen::capacity_in_words() const { | |
755 return eden_space()->capacity_in_words() | |
756 + from_space()->capacity_in_words(); // to_space() is only used during scavenge | |
757 } | |
758 | |
759 | |
760 size_t PSYoungGen::used_in_words() const { | |
761 return eden_space()->used_in_words() | |
762 + from_space()->used_in_words(); // to_space() is only used during scavenge | |
763 } | |
764 | |
765 | |
766 size_t PSYoungGen::free_in_words() const { | |
767 return eden_space()->free_in_words() | |
768 + from_space()->free_in_words(); // to_space() is only used during scavenge | |
769 } | |
770 | |
771 void PSYoungGen::object_iterate(ObjectClosure* blk) { | |
772 eden_space()->object_iterate(blk); | |
773 from_space()->object_iterate(blk); | |
774 to_space()->object_iterate(blk); | |
775 } | |
776 | |
777 void PSYoungGen::precompact() { | |
778 eden_mark_sweep()->precompact(); | |
779 from_mark_sweep()->precompact(); | |
780 to_mark_sweep()->precompact(); | |
781 } | |
782 | |
783 void PSYoungGen::adjust_pointers() { | |
784 eden_mark_sweep()->adjust_pointers(); | |
785 from_mark_sweep()->adjust_pointers(); | |
786 to_mark_sweep()->adjust_pointers(); | |
787 } | |
788 | |
789 void PSYoungGen::compact() { | |
790 eden_mark_sweep()->compact(ZapUnusedHeapArea); | |
791 from_mark_sweep()->compact(ZapUnusedHeapArea); | |
792 // Mark sweep stores preserved markOops in to space, don't disturb! | |
793 to_mark_sweep()->compact(false); | |
794 } | |
795 | |
796 void PSYoungGen::print() const { print_on(tty); } | |
797 void PSYoungGen::print_on(outputStream* st) const { | |
798 st->print(" %-15s", "PSYoungGen"); | |
799 if (PrintGCDetails && Verbose) { | |
800 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
801 capacity_in_bytes(), used_in_bytes()); | |
802 } else { | |
803 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
804 capacity_in_bytes()/K, used_in_bytes()/K); | |
805 } | |
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806 virtual_space()->print_space_boundaries_on(st); |
0 | 807 st->print(" eden"); eden_space()->print_on(st); |
808 st->print(" from"); from_space()->print_on(st); | |
809 st->print(" to "); to_space()->print_on(st); | |
810 } | |
811 | |
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812 // Note that a space is not printed before the [NAME: |
0 | 813 void PSYoungGen::print_used_change(size_t prev_used) const { |
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814 gclog_or_tty->print("[%s:", name()); |
0 | 815 gclog_or_tty->print(" " SIZE_FORMAT "K" |
816 "->" SIZE_FORMAT "K" | |
817 "(" SIZE_FORMAT "K)", | |
818 prev_used / K, used_in_bytes() / K, | |
819 capacity_in_bytes() / K); | |
820 gclog_or_tty->print("]"); | |
821 } | |
822 | |
823 size_t PSYoungGen::available_for_expansion() { | |
824 ShouldNotReachHere(); | |
825 return 0; | |
826 } | |
827 | |
828 size_t PSYoungGen::available_for_contraction() { | |
829 ShouldNotReachHere(); | |
830 return 0; | |
831 } | |
832 | |
833 size_t PSYoungGen::available_to_min_gen() { | |
834 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
835 return virtual_space()->committed_size() - min_gen_size(); | |
836 } | |
837 | |
838 // This method assumes that from-space has live data and that | |
839 // any shrinkage of the young gen is limited by location of | |
840 // from-space. | |
841 size_t PSYoungGen::available_to_live() { | |
842 size_t delta_in_survivor = 0; | |
843 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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844 const size_t space_alignment = heap->space_alignment(); |
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845 const size_t gen_alignment = heap->generation_alignment(); |
0 | 846 |
847 MutableSpace* space_shrinking = NULL; | |
848 if (from_space()->end() > to_space()->end()) { | |
849 space_shrinking = from_space(); | |
850 } else { | |
851 space_shrinking = to_space(); | |
852 } | |
853 | |
854 // Include any space that is committed but not included in | |
855 // the survivor spaces. | |
856 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
857 "Survivor space beyond high end"); | |
858 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
859 space_shrinking->end(), sizeof(char)); | |
860 | |
861 if (space_shrinking->is_empty()) { | |
862 // Don't let the space shrink to 0 | |
863 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
864 "Space is too small"); | |
865 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
866 } else { | |
867 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
868 space_shrinking->top(), | |
869 sizeof(char)); | |
870 } | |
871 | |
872 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
873 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
874 return delta_in_bytes; | |
875 } | |
876 | |
877 // Return the number of bytes available for resizing down the young | |
878 // generation. This is the minimum of | |
879 // input "bytes" | |
880 // bytes to the minimum young gen size | |
881 // bytes to the size currently being used + some small extra | |
882 size_t PSYoungGen::limit_gen_shrink(size_t bytes) { | |
883 // Allow shrinkage into the current eden but keep eden large enough | |
884 // to maintain the minimum young gen size | |
885 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
886 return align_size_down(bytes, virtual_space()->alignment()); | |
887 } | |
888 | |
889 void PSYoungGen::reset_after_change() { | |
890 ShouldNotReachHere(); | |
891 } | |
892 | |
893 void PSYoungGen::reset_survivors_after_shrink() { | |
894 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
895 (HeapWord*)virtual_space()->high_boundary()); | |
896 PSScavenge::reference_processor()->set_span(_reserved); | |
897 | |
898 MutableSpace* space_shrinking = NULL; | |
899 if (from_space()->end() > to_space()->end()) { | |
900 space_shrinking = from_space(); | |
901 } else { | |
902 space_shrinking = to_space(); | |
903 } | |
904 | |
905 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
906 assert(new_end >= space_shrinking->bottom(), "Shrink was too large"); | |
907 // Was there a shrink of the survivor space? | |
908 if (new_end < space_shrinking->end()) { | |
909 MemRegion mr(space_shrinking->bottom(), new_end); | |
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910 space_shrinking->initialize(mr, |
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911 SpaceDecorator::DontClear, |
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912 SpaceDecorator::Mangle); |
0 | 913 } |
914 } | |
915 | |
916 // This method currently does not expect to expand into eden (i.e., | |
917 // the virtual space boundaries is expected to be consistent | |
918 // with the eden boundaries.. | |
919 void PSYoungGen::post_resize() { | |
920 assert_locked_or_safepoint(Heap_lock); | |
921 assert((eden_space()->bottom() < to_space()->bottom()) && | |
922 (eden_space()->bottom() < from_space()->bottom()), | |
923 "Eden is assumed to be below the survivor spaces"); | |
924 | |
925 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
926 (HeapWord*)virtual_space()->high()); | |
927 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
928 space_invariants(); | |
929 } | |
930 | |
931 | |
932 | |
933 void PSYoungGen::update_counters() { | |
934 if (UsePerfData) { | |
935 _eden_counters->update_all(); | |
936 _from_counters->update_all(); | |
937 _to_counters->update_all(); | |
938 _gen_counters->update_all(); | |
939 } | |
940 } | |
941 | |
6008 | 942 void PSYoungGen::verify() { |
943 eden_space()->verify(); | |
944 from_space()->verify(); | |
945 to_space()->verify(); | |
0 | 946 } |
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947 |
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948 #ifndef PRODUCT |
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949 void PSYoungGen::record_spaces_top() { |
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950 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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951 eden_space()->set_top_for_allocations(); |
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952 from_space()->set_top_for_allocations(); |
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953 to_space()->set_top_for_allocations(); |
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954 } |
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955 #endif |