Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | 0b54ffe4c2d3 |
children | 8f07aa079343 |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 2001, 2012, 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->intra_heap_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->intra_heap_alignment(); |
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160 size_t size = virtual_space()->committed_size(); |
0 | 161 |
162 size_t survivor_size = size / InitialSurvivorRatio; | |
163 survivor_size = align_size_down(survivor_size, alignment); | |
164 // ... but never less than an alignment | |
165 survivor_size = MAX2(survivor_size, alignment); | |
166 | |
167 // Young generation is eden + 2 survivor spaces | |
168 size_t eden_size = size - (2 * survivor_size); | |
169 | |
170 // Now go ahead and set 'em. | |
171 set_space_boundaries(eden_size, survivor_size); | |
172 space_invariants(); | |
173 | |
174 if (UsePerfData) { | |
175 _eden_counters->update_capacity(); | |
176 _from_counters->update_capacity(); | |
177 _to_counters->update_capacity(); | |
178 } | |
179 } | |
180 | |
181 void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) { | |
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182 assert(eden_size < virtual_space()->committed_size(), "just checking"); |
0 | 183 assert(eden_size > 0 && survivor_size > 0, "just checking"); |
184 | |
185 // Initial layout is Eden, to, from. After swapping survivor spaces, | |
186 // that leaves us with Eden, from, to, which is step one in our two | |
187 // step resize-with-live-data procedure. | |
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188 char *eden_start = virtual_space()->low(); |
0 | 189 char *to_start = eden_start + eden_size; |
190 char *from_start = to_start + survivor_size; | |
191 char *from_end = from_start + survivor_size; | |
192 | |
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193 assert(from_end == virtual_space()->high(), "just checking"); |
0 | 194 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
195 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
196 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
197 | |
198 MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start); | |
199 MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start); | |
200 MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end); | |
201 | |
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202 eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea); |
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203 to_space()->initialize(to_mr , true, ZapUnusedHeapArea); |
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204 from_space()->initialize(from_mr, true, ZapUnusedHeapArea); |
0 | 205 } |
206 | |
207 #ifndef PRODUCT | |
208 void PSYoungGen::space_invariants() { | |
209 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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210 const size_t alignment = heap->intra_heap_alignment(); |
0 | 211 |
212 // Currently, our eden size cannot shrink to zero | |
213 guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small"); | |
214 guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small"); | |
215 guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small"); | |
216 | |
217 // Relationship of spaces to each other | |
218 char* eden_start = (char*)eden_space()->bottom(); | |
219 char* eden_end = (char*)eden_space()->end(); | |
220 char* from_start = (char*)from_space()->bottom(); | |
221 char* from_end = (char*)from_space()->end(); | |
222 char* to_start = (char*)to_space()->bottom(); | |
223 char* to_end = (char*)to_space()->end(); | |
224 | |
263
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225 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); |
0 | 226 guarantee(eden_start < eden_end, "eden space consistency"); |
227 guarantee(from_start < from_end, "from space consistency"); | |
228 guarantee(to_start < to_end, "to space consistency"); | |
229 | |
230 // Check whether from space is below to space | |
231 if (from_start < to_start) { | |
232 // Eden, from, to | |
233 guarantee(eden_end <= from_start, "eden/from boundary"); | |
234 guarantee(from_end <= to_start, "from/to boundary"); | |
263
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235 guarantee(to_end <= virtual_space()->high(), "to end"); |
0 | 236 } else { |
237 // Eden, to, from | |
238 guarantee(eden_end <= to_start, "eden/to boundary"); | |
239 guarantee(to_end <= from_start, "to/from boundary"); | |
263
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240 guarantee(from_end <= virtual_space()->high(), "from end"); |
0 | 241 } |
242 | |
243 // More checks that the virtual space is consistent with the spaces | |
263
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244 assert(virtual_space()->committed_size() >= |
0 | 245 (eden_space()->capacity_in_bytes() + |
246 to_space()->capacity_in_bytes() + | |
247 from_space()->capacity_in_bytes()), "Committed size is inconsistent"); | |
263
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248 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
0 | 249 "Space invariant"); |
250 char* eden_top = (char*)eden_space()->top(); | |
251 char* from_top = (char*)from_space()->top(); | |
252 char* to_top = (char*)to_space()->top(); | |
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253 assert(eden_top <= virtual_space()->high(), "eden top"); |
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254 assert(from_top <= virtual_space()->high(), "from top"); |
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255 assert(to_top <= virtual_space()->high(), "to top"); |
0 | 256 |
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257 virtual_space()->verify(); |
0 | 258 } |
259 #endif | |
260 | |
261 void PSYoungGen::resize(size_t eden_size, size_t survivor_size) { | |
262 // Resize the generation if needed. If the generation resize | |
263 // reports false, do not attempt to resize the spaces. | |
264 if (resize_generation(eden_size, survivor_size)) { | |
265 // Then we lay out the spaces inside the generation | |
266 resize_spaces(eden_size, survivor_size); | |
267 | |
268 space_invariants(); | |
269 | |
270 if (PrintAdaptiveSizePolicy && Verbose) { | |
271 gclog_or_tty->print_cr("Young generation size: " | |
272 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
273 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
274 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
275 eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(), | |
276 _max_gen_size, min_gen_size()); | |
277 } | |
278 } | |
279 } | |
280 | |
281 | |
282 bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
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283 const size_t alignment = virtual_space()->alignment(); |
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284 size_t orig_size = virtual_space()->committed_size(); |
0 | 285 bool size_changed = false; |
286 | |
287 // There used to be this guarantee there. | |
288 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
289 // Code below forces this requirement. In addition the desired eden | |
290 // size and disired survivor sizes are desired goals and may | |
291 // exceed the total generation size. | |
292 | |
293 assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking"); | |
294 | |
295 // Adjust new generation size | |
296 const size_t eden_plus_survivors = | |
297 align_size_up(eden_size + 2 * survivor_size, alignment); | |
298 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()), | |
299 min_gen_size()); | |
300 assert(desired_size <= max_size(), "just checking"); | |
301 | |
302 if (desired_size > orig_size) { | |
303 // Grow the generation | |
304 size_t change = desired_size - orig_size; | |
305 assert(change % alignment == 0, "just checking"); | |
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306 HeapWord* prev_high = (HeapWord*) virtual_space()->high(); |
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307 if (!virtual_space()->expand_by(change)) { |
0 | 308 return false; // Error if we fail to resize! |
309 } | |
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310 if (ZapUnusedHeapArea) { |
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311 // Mangle newly committed space immediately because it |
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312 // can be done here more simply that after the new |
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313 // spaces have been computed. |
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314 HeapWord* new_high = (HeapWord*) virtual_space()->high(); |
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315 MemRegion mangle_region(prev_high, new_high); |
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316 SpaceMangler::mangle_region(mangle_region); |
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317 } |
0 | 318 size_changed = true; |
319 } else if (desired_size < orig_size) { | |
320 size_t desired_change = orig_size - desired_size; | |
321 assert(desired_change % alignment == 0, "just checking"); | |
322 | |
323 desired_change = limit_gen_shrink(desired_change); | |
324 | |
325 if (desired_change > 0) { | |
326 virtual_space()->shrink_by(desired_change); | |
327 reset_survivors_after_shrink(); | |
328 | |
329 size_changed = true; | |
330 } | |
331 } else { | |
332 if (Verbose && PrintGC) { | |
333 if (orig_size == gen_size_limit()) { | |
334 gclog_or_tty->print_cr("PSYoung generation size at maximum: " | |
335 SIZE_FORMAT "K", orig_size/K); | |
336 } else if (orig_size == min_gen_size()) { | |
337 gclog_or_tty->print_cr("PSYoung generation size at minium: " | |
338 SIZE_FORMAT "K", orig_size/K); | |
339 } | |
340 } | |
341 } | |
342 | |
343 if (size_changed) { | |
344 post_resize(); | |
345 | |
346 if (Verbose && PrintGC) { | |
263
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347 size_t current_size = virtual_space()->committed_size(); |
0 | 348 gclog_or_tty->print_cr("PSYoung generation size changed: " |
349 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
350 orig_size/K, current_size/K); | |
351 } | |
352 } | |
353 | |
263
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354 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || |
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355 virtual_space()->committed_size() == max_size(), "Sanity"); |
0 | 356 |
357 return true; | |
358 } | |
359 | |
263
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360 #ifndef PRODUCT |
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361 // In the numa case eden is not mangled so a survivor space |
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362 // moving into a region previously occupied by a survivor |
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363 // may find an unmangled region. Also in the PS case eden |
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364 // to-space and from-space may not touch (i.e., there may be |
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365 // gaps between them due to movement while resizing the |
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366 // spaces). Those gaps must be mangled. |
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367 void PSYoungGen::mangle_survivors(MutableSpace* s1, |
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368 MemRegion s1MR, |
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369 MutableSpace* s2, |
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370 MemRegion s2MR) { |
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371 // Check eden and gap between eden and from-space, in deciding |
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372 // what to mangle in from-space. Check the gap between from-space |
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373 // and to-space when deciding what to mangle. |
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374 // |
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375 // +--------+ +----+ +---+ |
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376 // | eden | |s1 | |s2 | |
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377 // +--------+ +----+ +---+ |
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378 // +-------+ +-----+ |
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379 // |s1MR | |s2MR | |
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380 // +-------+ +-----+ |
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381 // All of survivor-space is properly mangled so find the |
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382 // upper bound on the mangling for any portion above current s1. |
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383 HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end()); |
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384 MemRegion delta1_left; |
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385 if (s1MR.start() < delta_end) { |
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386 delta1_left = MemRegion(s1MR.start(), delta_end); |
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387 s1->mangle_region(delta1_left); |
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388 } |
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389 // Find any portion to the right of the current s1. |
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390 HeapWord* delta_start = MAX2(s1->end(), s1MR.start()); |
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391 MemRegion delta1_right; |
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392 if (delta_start < s1MR.end()) { |
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393 delta1_right = MemRegion(delta_start, s1MR.end()); |
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394 s1->mangle_region(delta1_right); |
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395 } |
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396 |
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397 // Similarly for the second survivor space except that |
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398 // any of the new region that overlaps with the current |
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399 // region of the first survivor space has already been |
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400 // mangled. |
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401 delta_end = MIN2(s2->bottom(), s2MR.end()); |
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402 delta_start = MAX2(s2MR.start(), s1->end()); |
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403 MemRegion delta2_left; |
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404 if (s2MR.start() < delta_end) { |
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405 delta2_left = MemRegion(s2MR.start(), delta_end); |
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406 s2->mangle_region(delta2_left); |
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407 } |
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408 delta_start = MAX2(s2->end(), s2MR.start()); |
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409 MemRegion delta2_right; |
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410 if (delta_start < s2MR.end()) { |
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411 s2->mangle_region(delta2_right); |
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412 } |
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413 |
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414 if (TraceZapUnusedHeapArea) { |
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415 // s1 |
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416 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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417 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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418 s1->bottom(), s1->end(), s1MR.start(), s1MR.end()); |
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419 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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420 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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421 delta1_left.start(), delta1_left.end(), delta1_right.start(), |
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422 delta1_right.end()); |
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423 |
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424 // s2 |
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425 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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426 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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427 s2->bottom(), s2->end(), s2MR.start(), s2MR.end()); |
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428 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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429 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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430 delta2_left.start(), delta2_left.end(), delta2_right.start(), |
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431 delta2_right.end()); |
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432 } |
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433 |
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434 } |
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435 #endif // NOT PRODUCT |
0 | 436 |
437 void PSYoungGen::resize_spaces(size_t requested_eden_size, | |
438 size_t requested_survivor_size) { | |
439 assert(UseAdaptiveSizePolicy, "sanity check"); | |
440 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
441 "just checking"); | |
442 | |
443 // We require eden and to space to be empty | |
444 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
445 return; | |
446 } | |
447 | |
448 if (PrintAdaptiveSizePolicy && Verbose) { | |
449 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
450 SIZE_FORMAT | |
451 ", requested_survivor_size: " SIZE_FORMAT ")", | |
452 requested_eden_size, requested_survivor_size); | |
453 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
454 SIZE_FORMAT, | |
455 eden_space()->bottom(), | |
456 eden_space()->end(), | |
457 pointer_delta(eden_space()->end(), | |
458 eden_space()->bottom(), | |
459 sizeof(char))); | |
460 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
461 SIZE_FORMAT, | |
462 from_space()->bottom(), | |
463 from_space()->end(), | |
464 pointer_delta(from_space()->end(), | |
465 from_space()->bottom(), | |
466 sizeof(char))); | |
467 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
468 SIZE_FORMAT, | |
469 to_space()->bottom(), | |
470 to_space()->end(), | |
471 pointer_delta( to_space()->end(), | |
472 to_space()->bottom(), | |
473 sizeof(char))); | |
474 } | |
475 | |
476 // There's nothing to do if the new sizes are the same as the current | |
477 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
478 requested_survivor_size == from_space()->capacity_in_bytes() && | |
479 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
480 if (PrintAdaptiveSizePolicy && Verbose) { | |
481 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
482 } | |
483 return; | |
484 } | |
485 | |
486 char* eden_start = (char*)eden_space()->bottom(); | |
487 char* eden_end = (char*)eden_space()->end(); | |
488 char* from_start = (char*)from_space()->bottom(); | |
489 char* from_end = (char*)from_space()->end(); | |
490 char* to_start = (char*)to_space()->bottom(); | |
491 char* to_end = (char*)to_space()->end(); | |
492 | |
493 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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494 const size_t alignment = heap->intra_heap_alignment(); |
0 | 495 const bool maintain_minimum = |
496 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
497 | |
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498 bool eden_from_to_order = from_start < to_start; |
0 | 499 // Check whether from space is below to space |
263
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500 if (eden_from_to_order) { |
0 | 501 // Eden, from, to |
263
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502 eden_from_to_order = true; |
0 | 503 if (PrintAdaptiveSizePolicy && Verbose) { |
504 gclog_or_tty->print_cr(" Eden, from, to:"); | |
505 } | |
506 | |
507 // Set eden | |
508 // "requested_eden_size" is a goal for the size of eden | |
509 // and may not be attainable. "eden_size" below is | |
510 // calculated based on the location of from-space and | |
511 // the goal for the size of eden. from-space is | |
512 // fixed in place because it contains live data. | |
513 // The calculation is done this way to avoid 32bit | |
514 // overflow (i.e., eden_start + requested_eden_size | |
515 // may too large for representation in 32bits). | |
516 size_t eden_size; | |
517 if (maintain_minimum) { | |
518 // Only make eden larger than the requested size if | |
519 // the minimum size of the generation has to be maintained. | |
520 // This could be done in general but policy at a higher | |
521 // level is determining a requested size for eden and that | |
522 // should be honored unless there is a fundamental reason. | |
523 eden_size = pointer_delta(from_start, | |
524 eden_start, | |
525 sizeof(char)); | |
526 } else { | |
527 eden_size = MIN2(requested_eden_size, | |
528 pointer_delta(from_start, eden_start, sizeof(char))); | |
529 } | |
530 | |
531 eden_end = eden_start + eden_size; | |
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532 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 533 |
534 // To may resize into from space as long as it is clear of live data. | |
535 // From space must remain page aligned, though, so we need to do some | |
536 // extra calculations. | |
537 | |
538 // First calculate an optimal to-space | |
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539 to_end = (char*)virtual_space()->high(); |
0 | 540 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
541 sizeof(char)); | |
542 | |
543 // Does the optimal to-space overlap from-space? | |
544 if (to_start < (char*)from_space()->end()) { | |
545 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
546 | |
547 // Calculate the minimum offset possible for from_end | |
548 size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
549 | |
550 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
551 if (from_size == 0) { | |
552 from_size = alignment; | |
553 } else { | |
554 from_size = align_size_up(from_size, alignment); | |
555 } | |
556 | |
557 from_end = from_start + from_size; | |
558 assert(from_end > from_start, "addition overflow or from_size problem"); | |
559 | |
560 guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right"); | |
561 | |
562 // Now update to_start with the new from_end | |
563 to_start = MAX2(from_end, to_start); | |
564 } | |
565 | |
566 guarantee(to_start != to_end, "to space is zero sized"); | |
567 | |
568 if (PrintAdaptiveSizePolicy && Verbose) { | |
569 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
570 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
571 eden_start, | |
572 eden_end, | |
573 pointer_delta(eden_end, eden_start, sizeof(char))); | |
574 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
575 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
576 from_start, | |
577 from_end, | |
578 pointer_delta(from_end, from_start, sizeof(char))); | |
579 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
580 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
581 to_start, | |
582 to_end, | |
583 pointer_delta( to_end, to_start, sizeof(char))); | |
584 } | |
585 } else { | |
586 // Eden, to, from | |
587 if (PrintAdaptiveSizePolicy && Verbose) { | |
588 gclog_or_tty->print_cr(" Eden, to, from:"); | |
589 } | |
590 | |
591 // To space gets priority over eden resizing. Note that we position | |
592 // to space as if we were able to resize from space, even though from | |
593 // space is not modified. | |
594 // Giving eden priority was tried and gave poorer performance. | |
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595 to_end = (char*)pointer_delta(virtual_space()->high(), |
0 | 596 (char*)requested_survivor_size, |
597 sizeof(char)); | |
598 to_end = MIN2(to_end, from_start); | |
599 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
600 sizeof(char)); | |
601 // if the space sizes are to be increased by several times then | |
602 // 'to_start' will point beyond the young generation. In this case | |
603 // 'to_start' should be adjusted. | |
604 to_start = MAX2(to_start, eden_start + alignment); | |
605 | |
606 // Compute how big eden can be, then adjust end. | |
607 // See comments above on calculating eden_end. | |
608 size_t eden_size; | |
609 if (maintain_minimum) { | |
610 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); | |
611 } else { | |
612 eden_size = MIN2(requested_eden_size, | |
613 pointer_delta(to_start, eden_start, sizeof(char))); | |
614 } | |
615 eden_end = eden_start + eden_size; | |
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616 assert(eden_end >= eden_start, "addition overflowed"); |
0 | 617 |
618 // Could choose to not let eden shrink | |
619 // to_start = MAX2(to_start, eden_end); | |
620 | |
621 // Don't let eden shrink down to 0 or less. | |
622 eden_end = MAX2(eden_end, eden_start + alignment); | |
623 to_start = MAX2(to_start, eden_end); | |
624 | |
625 if (PrintAdaptiveSizePolicy && Verbose) { | |
626 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
627 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
628 eden_start, | |
629 eden_end, | |
630 pointer_delta(eden_end, eden_start, sizeof(char))); | |
631 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
632 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
633 to_start, | |
634 to_end, | |
635 pointer_delta( to_end, to_start, sizeof(char))); | |
636 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
637 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
638 from_start, | |
639 from_end, | |
640 pointer_delta(from_end, from_start, sizeof(char))); | |
641 } | |
642 } | |
643 | |
644 | |
645 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
646 "from start moved to the right"); | |
647 guarantee((HeapWord*)from_end >= from_space()->top(), | |
648 "from end moved into live data"); | |
649 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
650 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
651 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
652 | |
653 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
654 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
655 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
656 | |
657 // Let's make sure the call to initialize doesn't reset "top"! | |
658 HeapWord* old_from_top = from_space()->top(); | |
659 | |
660 // For PrintAdaptiveSizePolicy block below | |
661 size_t old_from = from_space()->capacity_in_bytes(); | |
662 size_t old_to = to_space()->capacity_in_bytes(); | |
663 | |
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664 if (ZapUnusedHeapArea) { |
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665 // NUMA is a special case because a numa space is not mangled |
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666 // in order to not prematurely bind its address to memory to |
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667 // the wrong memory (i.e., don't want the GC thread to first |
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668 // touch the memory). The survivor spaces are not numa |
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669 // spaces and are mangled. |
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670 if (UseNUMA) { |
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671 if (eden_from_to_order) { |
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672 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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673 } else { |
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674 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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675 } |
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676 } |
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677 |
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678 // If not mangling the spaces, do some checking to verify that |
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679 // the spaces are already mangled. |
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680 // The spaces should be correctly mangled at this point so |
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681 // do some checking here. Note that they are not being mangled |
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682 // in the calls to initialize(). |
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683 // Must check mangling before the spaces are reshaped. Otherwise, |
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684 // the bottom or end of one space may have moved into an area |
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685 // covered by another space and a failure of the check may |
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686 // not correctly indicate which space is not properly mangled. |
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687 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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688 eden_space()->check_mangled_unused_area(limit); |
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689 from_space()->check_mangled_unused_area(limit); |
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690 to_space()->check_mangled_unused_area(limit); |
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691 } |
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692 // When an existing space is being initialized, it is not |
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693 // mangled because the space has been previously mangled. |
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694 eden_space()->initialize(edenMR, |
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695 SpaceDecorator::Clear, |
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696 SpaceDecorator::DontMangle); |
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697 to_space()->initialize(toMR, |
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698 SpaceDecorator::Clear, |
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699 SpaceDecorator::DontMangle); |
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700 from_space()->initialize(fromMR, |
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701 SpaceDecorator::DontClear, |
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702 SpaceDecorator::DontMangle); |
0 | 703 |
704 assert(from_space()->top() == old_from_top, "from top changed!"); | |
705 | |
706 if (PrintAdaptiveSizePolicy) { | |
707 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
708 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
709 | |
710 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
711 "collection: %d " | |
712 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
713 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
714 heap->total_collections(), | |
715 old_from, old_to, | |
716 from_space()->capacity_in_bytes(), | |
717 to_space()->capacity_in_bytes()); | |
718 gclog_or_tty->cr(); | |
719 } | |
720 } | |
721 | |
722 void PSYoungGen::swap_spaces() { | |
723 MutableSpace* s = from_space(); | |
724 _from_space = to_space(); | |
725 _to_space = s; | |
726 | |
727 // Now update the decorators. | |
728 PSMarkSweepDecorator* md = from_mark_sweep(); | |
729 _from_mark_sweep = to_mark_sweep(); | |
730 _to_mark_sweep = md; | |
731 | |
732 assert(from_mark_sweep()->space() == from_space(), "Sanity"); | |
733 assert(to_mark_sweep()->space() == to_space(), "Sanity"); | |
734 } | |
735 | |
736 size_t PSYoungGen::capacity_in_bytes() const { | |
737 return eden_space()->capacity_in_bytes() | |
738 + from_space()->capacity_in_bytes(); // to_space() is only used during scavenge | |
739 } | |
740 | |
741 | |
742 size_t PSYoungGen::used_in_bytes() const { | |
743 return eden_space()->used_in_bytes() | |
744 + from_space()->used_in_bytes(); // to_space() is only used during scavenge | |
745 } | |
746 | |
747 | |
748 size_t PSYoungGen::free_in_bytes() const { | |
749 return eden_space()->free_in_bytes() | |
750 + from_space()->free_in_bytes(); // to_space() is only used during scavenge | |
751 } | |
752 | |
753 size_t PSYoungGen::capacity_in_words() const { | |
754 return eden_space()->capacity_in_words() | |
755 + from_space()->capacity_in_words(); // to_space() is only used during scavenge | |
756 } | |
757 | |
758 | |
759 size_t PSYoungGen::used_in_words() const { | |
760 return eden_space()->used_in_words() | |
761 + from_space()->used_in_words(); // to_space() is only used during scavenge | |
762 } | |
763 | |
764 | |
765 size_t PSYoungGen::free_in_words() const { | |
766 return eden_space()->free_in_words() | |
767 + from_space()->free_in_words(); // to_space() is only used during scavenge | |
768 } | |
769 | |
770 void PSYoungGen::object_iterate(ObjectClosure* blk) { | |
771 eden_space()->object_iterate(blk); | |
772 from_space()->object_iterate(blk); | |
773 to_space()->object_iterate(blk); | |
774 } | |
775 | |
776 void PSYoungGen::precompact() { | |
777 eden_mark_sweep()->precompact(); | |
778 from_mark_sweep()->precompact(); | |
779 to_mark_sweep()->precompact(); | |
780 } | |
781 | |
782 void PSYoungGen::adjust_pointers() { | |
783 eden_mark_sweep()->adjust_pointers(); | |
784 from_mark_sweep()->adjust_pointers(); | |
785 to_mark_sweep()->adjust_pointers(); | |
786 } | |
787 | |
788 void PSYoungGen::compact() { | |
789 eden_mark_sweep()->compact(ZapUnusedHeapArea); | |
790 from_mark_sweep()->compact(ZapUnusedHeapArea); | |
791 // Mark sweep stores preserved markOops in to space, don't disturb! | |
792 to_mark_sweep()->compact(false); | |
793 } | |
794 | |
795 void PSYoungGen::print() const { print_on(tty); } | |
796 void PSYoungGen::print_on(outputStream* st) const { | |
797 st->print(" %-15s", "PSYoungGen"); | |
798 if (PrintGCDetails && Verbose) { | |
799 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
800 capacity_in_bytes(), used_in_bytes()); | |
801 } else { | |
802 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
803 capacity_in_bytes()/K, used_in_bytes()/K); | |
804 } | |
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805 virtual_space()->print_space_boundaries_on(st); |
0 | 806 st->print(" eden"); eden_space()->print_on(st); |
807 st->print(" from"); from_space()->print_on(st); | |
808 st->print(" to "); to_space()->print_on(st); | |
809 } | |
810 | |
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811 // Note that a space is not printed before the [NAME: |
0 | 812 void PSYoungGen::print_used_change(size_t prev_used) const { |
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813 gclog_or_tty->print("[%s:", name()); |
0 | 814 gclog_or_tty->print(" " SIZE_FORMAT "K" |
815 "->" SIZE_FORMAT "K" | |
816 "(" SIZE_FORMAT "K)", | |
817 prev_used / K, used_in_bytes() / K, | |
818 capacity_in_bytes() / K); | |
819 gclog_or_tty->print("]"); | |
820 } | |
821 | |
822 size_t PSYoungGen::available_for_expansion() { | |
823 ShouldNotReachHere(); | |
824 return 0; | |
825 } | |
826 | |
827 size_t PSYoungGen::available_for_contraction() { | |
828 ShouldNotReachHere(); | |
829 return 0; | |
830 } | |
831 | |
832 size_t PSYoungGen::available_to_min_gen() { | |
833 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
834 return virtual_space()->committed_size() - min_gen_size(); | |
835 } | |
836 | |
837 // This method assumes that from-space has live data and that | |
838 // any shrinkage of the young gen is limited by location of | |
839 // from-space. | |
840 size_t PSYoungGen::available_to_live() { | |
841 size_t delta_in_survivor = 0; | |
842 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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843 const size_t space_alignment = heap->intra_heap_alignment(); |
0 | 844 const size_t gen_alignment = heap->young_gen_alignment(); |
845 | |
846 MutableSpace* space_shrinking = NULL; | |
847 if (from_space()->end() > to_space()->end()) { | |
848 space_shrinking = from_space(); | |
849 } else { | |
850 space_shrinking = to_space(); | |
851 } | |
852 | |
853 // Include any space that is committed but not included in | |
854 // the survivor spaces. | |
855 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
856 "Survivor space beyond high end"); | |
857 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
858 space_shrinking->end(), sizeof(char)); | |
859 | |
860 if (space_shrinking->is_empty()) { | |
861 // Don't let the space shrink to 0 | |
862 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
863 "Space is too small"); | |
864 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
865 } else { | |
866 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
867 space_shrinking->top(), | |
868 sizeof(char)); | |
869 } | |
870 | |
871 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
872 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
873 return delta_in_bytes; | |
874 } | |
875 | |
876 // Return the number of bytes available for resizing down the young | |
877 // generation. This is the minimum of | |
878 // input "bytes" | |
879 // bytes to the minimum young gen size | |
880 // bytes to the size currently being used + some small extra | |
881 size_t PSYoungGen::limit_gen_shrink(size_t bytes) { | |
882 // Allow shrinkage into the current eden but keep eden large enough | |
883 // to maintain the minimum young gen size | |
884 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
885 return align_size_down(bytes, virtual_space()->alignment()); | |
886 } | |
887 | |
888 void PSYoungGen::reset_after_change() { | |
889 ShouldNotReachHere(); | |
890 } | |
891 | |
892 void PSYoungGen::reset_survivors_after_shrink() { | |
893 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
894 (HeapWord*)virtual_space()->high_boundary()); | |
895 PSScavenge::reference_processor()->set_span(_reserved); | |
896 | |
897 MutableSpace* space_shrinking = NULL; | |
898 if (from_space()->end() > to_space()->end()) { | |
899 space_shrinking = from_space(); | |
900 } else { | |
901 space_shrinking = to_space(); | |
902 } | |
903 | |
904 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
905 assert(new_end >= space_shrinking->bottom(), "Shrink was too large"); | |
906 // Was there a shrink of the survivor space? | |
907 if (new_end < space_shrinking->end()) { | |
908 MemRegion mr(space_shrinking->bottom(), new_end); | |
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909 space_shrinking->initialize(mr, |
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910 SpaceDecorator::DontClear, |
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911 SpaceDecorator::Mangle); |
0 | 912 } |
913 } | |
914 | |
915 // This method currently does not expect to expand into eden (i.e., | |
916 // the virtual space boundaries is expected to be consistent | |
917 // with the eden boundaries.. | |
918 void PSYoungGen::post_resize() { | |
919 assert_locked_or_safepoint(Heap_lock); | |
920 assert((eden_space()->bottom() < to_space()->bottom()) && | |
921 (eden_space()->bottom() < from_space()->bottom()), | |
922 "Eden is assumed to be below the survivor spaces"); | |
923 | |
924 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
925 (HeapWord*)virtual_space()->high()); | |
926 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
927 space_invariants(); | |
928 } | |
929 | |
930 | |
931 | |
932 void PSYoungGen::update_counters() { | |
933 if (UsePerfData) { | |
934 _eden_counters->update_all(); | |
935 _from_counters->update_all(); | |
936 _to_counters->update_all(); | |
937 _gen_counters->update_all(); | |
938 } | |
939 } | |
940 | |
6008 | 941 void PSYoungGen::verify() { |
942 eden_space()->verify(); | |
943 from_space()->verify(); | |
944 to_space()->verify(); | |
0 | 945 } |
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946 |
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947 #ifndef PRODUCT |
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948 void PSYoungGen::record_spaces_top() { |
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949 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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950 eden_space()->set_top_for_allocations(); |
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951 from_space()->set_top_for_allocations(); |
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952 to_space()->set_top_for_allocations(); |
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953 } |
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954 #endif |