Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp @ 408:52e32c8b317e
6761092: jvm crashes when CDS is enabled.
Summary: CDS hardcoded max c++ virtual method table increased
Reviewed-by: coleenp, xlu, jmasa
author | acorn |
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date | Wed, 22 Oct 2008 14:48:08 -0400 |
parents | 850fdf70db2b |
children | 4e400c36026f |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_psYoungGen.cpp.incl" | |
27 | |
28 PSYoungGen::PSYoungGen(size_t initial_size, | |
29 size_t min_size, | |
30 size_t max_size) : | |
31 _init_gen_size(initial_size), | |
32 _min_gen_size(min_size), | |
33 _max_gen_size(max_size) | |
34 {} | |
35 | |
36 void PSYoungGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
37 assert(_init_gen_size != 0, "Should have a finite size"); | |
38 _virtual_space = new PSVirtualSpace(rs, alignment); | |
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39 if (!virtual_space()->expand_by(_init_gen_size)) { |
0 | 40 vm_exit_during_initialization("Could not reserve enough space for " |
41 "object heap"); | |
42 } | |
43 } | |
44 | |
45 void PSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
46 initialize_virtual_space(rs, alignment); | |
47 initialize_work(); | |
48 } | |
49 | |
50 void PSYoungGen::initialize_work() { | |
51 | |
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52 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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53 (HeapWord*)virtual_space()->high_boundary()); |
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54 |
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55 MemRegion cmr((HeapWord*)virtual_space()->low(), |
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56 (HeapWord*)virtual_space()->high()); |
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57 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
0 | 58 |
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59 if (ZapUnusedHeapArea) { |
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60 // Mangle newly committed space immediately because it |
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61 // can be done here more simply that after the new |
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62 // spaces have been computed. |
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63 SpaceMangler::mangle_region(cmr); |
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64 } |
0 | 65 |
66 if (UseNUMA) { | |
67 _eden_space = new MutableNUMASpace(); | |
68 } else { | |
69 _eden_space = new MutableSpace(); | |
70 } | |
71 _from_space = new MutableSpace(); | |
72 _to_space = new MutableSpace(); | |
73 | |
74 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { | |
75 vm_exit_during_initialization("Could not allocate a young gen space"); | |
76 } | |
77 | |
78 // Allocate the mark sweep views of spaces | |
79 _eden_mark_sweep = | |
80 new PSMarkSweepDecorator(_eden_space, NULL, MarkSweepDeadRatio); | |
81 _from_mark_sweep = | |
82 new PSMarkSweepDecorator(_from_space, NULL, MarkSweepDeadRatio); | |
83 _to_mark_sweep = | |
84 new PSMarkSweepDecorator(_to_space, NULL, MarkSweepDeadRatio); | |
85 | |
86 if (_eden_mark_sweep == NULL || | |
87 _from_mark_sweep == NULL || | |
88 _to_mark_sweep == NULL) { | |
89 vm_exit_during_initialization("Could not complete allocation" | |
90 " of the young generation"); | |
91 } | |
92 | |
93 // Generation Counters - generation 0, 3 subspaces | |
94 _gen_counters = new PSGenerationCounters("new", 0, 3, _virtual_space); | |
95 | |
96 // Compute maximum space sizes for performance counters | |
97 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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98 size_t alignment = heap->intra_heap_alignment(); |
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99 size_t size = virtual_space()->reserved_size(); |
0 | 100 |
101 size_t max_survivor_size; | |
102 size_t max_eden_size; | |
103 | |
104 if (UseAdaptiveSizePolicy) { | |
105 max_survivor_size = size / MinSurvivorRatio; | |
106 | |
107 // round the survivor space size down to the nearest alignment | |
108 // and make sure its size is greater than 0. | |
109 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
110 max_survivor_size = MAX2(max_survivor_size, alignment); | |
111 | |
112 // set the maximum size of eden to be the size of the young gen | |
113 // less two times the minimum survivor size. The minimum survivor | |
114 // size for UseAdaptiveSizePolicy is one alignment. | |
115 max_eden_size = size - 2 * alignment; | |
116 } else { | |
117 max_survivor_size = size / InitialSurvivorRatio; | |
118 | |
119 // round the survivor space size down to the nearest alignment | |
120 // and make sure its size is greater than 0. | |
121 max_survivor_size = align_size_down(max_survivor_size, alignment); | |
122 max_survivor_size = MAX2(max_survivor_size, alignment); | |
123 | |
124 // set the maximum size of eden to be the size of the young gen | |
125 // less two times the survivor size when the generation is 100% | |
126 // committed. The minimum survivor size for -UseAdaptiveSizePolicy | |
127 // is dependent on the committed portion (current capacity) of the | |
128 // generation - the less space committed, the smaller the survivor | |
129 // space, possibly as small as an alignment. However, we are interested | |
130 // in the case where the young generation is 100% committed, as this | |
131 // is the point where eden reachs its maximum size. At this point, | |
132 // the size of a survivor space is max_survivor_size. | |
133 max_eden_size = size - 2 * max_survivor_size; | |
134 } | |
135 | |
136 _eden_counters = new SpaceCounters("eden", 0, max_eden_size, _eden_space, | |
137 _gen_counters); | |
138 _from_counters = new SpaceCounters("s0", 1, max_survivor_size, _from_space, | |
139 _gen_counters); | |
140 _to_counters = new SpaceCounters("s1", 2, max_survivor_size, _to_space, | |
141 _gen_counters); | |
142 | |
143 compute_initial_space_boundaries(); | |
144 } | |
145 | |
146 void PSYoungGen::compute_initial_space_boundaries() { | |
147 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
148 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
149 | |
150 // Compute sizes | |
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151 size_t alignment = heap->intra_heap_alignment(); |
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152 size_t size = virtual_space()->committed_size(); |
0 | 153 |
154 size_t survivor_size = size / InitialSurvivorRatio; | |
155 survivor_size = align_size_down(survivor_size, alignment); | |
156 // ... but never less than an alignment | |
157 survivor_size = MAX2(survivor_size, alignment); | |
158 | |
159 // Young generation is eden + 2 survivor spaces | |
160 size_t eden_size = size - (2 * survivor_size); | |
161 | |
162 // Now go ahead and set 'em. | |
163 set_space_boundaries(eden_size, survivor_size); | |
164 space_invariants(); | |
165 | |
166 if (UsePerfData) { | |
167 _eden_counters->update_capacity(); | |
168 _from_counters->update_capacity(); | |
169 _to_counters->update_capacity(); | |
170 } | |
171 } | |
172 | |
173 void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) { | |
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174 assert(eden_size < virtual_space()->committed_size(), "just checking"); |
0 | 175 assert(eden_size > 0 && survivor_size > 0, "just checking"); |
176 | |
177 // Initial layout is Eden, to, from. After swapping survivor spaces, | |
178 // that leaves us with Eden, from, to, which is step one in our two | |
179 // step resize-with-live-data procedure. | |
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180 char *eden_start = virtual_space()->low(); |
0 | 181 char *to_start = eden_start + eden_size; |
182 char *from_start = to_start + survivor_size; | |
183 char *from_end = from_start + survivor_size; | |
184 | |
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185 assert(from_end == virtual_space()->high(), "just checking"); |
0 | 186 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
187 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
188 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
189 | |
190 MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start); | |
191 MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start); | |
192 MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end); | |
193 | |
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194 eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea); |
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195 to_space()->initialize(to_mr , true, ZapUnusedHeapArea); |
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196 from_space()->initialize(from_mr, true, ZapUnusedHeapArea); |
0 | 197 } |
198 | |
199 #ifndef PRODUCT | |
200 void PSYoungGen::space_invariants() { | |
201 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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202 const size_t alignment = heap->intra_heap_alignment(); |
0 | 203 |
204 // Currently, our eden size cannot shrink to zero | |
205 guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small"); | |
206 guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small"); | |
207 guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small"); | |
208 | |
209 // Relationship of spaces to each other | |
210 char* eden_start = (char*)eden_space()->bottom(); | |
211 char* eden_end = (char*)eden_space()->end(); | |
212 char* from_start = (char*)from_space()->bottom(); | |
213 char* from_end = (char*)from_space()->end(); | |
214 char* to_start = (char*)to_space()->bottom(); | |
215 char* to_end = (char*)to_space()->end(); | |
216 | |
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217 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); |
0 | 218 guarantee(eden_start < eden_end, "eden space consistency"); |
219 guarantee(from_start < from_end, "from space consistency"); | |
220 guarantee(to_start < to_end, "to space consistency"); | |
221 | |
222 // Check whether from space is below to space | |
223 if (from_start < to_start) { | |
224 // Eden, from, to | |
225 guarantee(eden_end <= from_start, "eden/from boundary"); | |
226 guarantee(from_end <= to_start, "from/to boundary"); | |
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227 guarantee(to_end <= virtual_space()->high(), "to end"); |
0 | 228 } else { |
229 // Eden, to, from | |
230 guarantee(eden_end <= to_start, "eden/to boundary"); | |
231 guarantee(to_end <= from_start, "to/from boundary"); | |
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232 guarantee(from_end <= virtual_space()->high(), "from end"); |
0 | 233 } |
234 | |
235 // More checks that the virtual space is consistent with the spaces | |
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236 assert(virtual_space()->committed_size() >= |
0 | 237 (eden_space()->capacity_in_bytes() + |
238 to_space()->capacity_in_bytes() + | |
239 from_space()->capacity_in_bytes()), "Committed size is inconsistent"); | |
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240 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
0 | 241 "Space invariant"); |
242 char* eden_top = (char*)eden_space()->top(); | |
243 char* from_top = (char*)from_space()->top(); | |
244 char* to_top = (char*)to_space()->top(); | |
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245 assert(eden_top <= virtual_space()->high(), "eden top"); |
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246 assert(from_top <= virtual_space()->high(), "from top"); |
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247 assert(to_top <= virtual_space()->high(), "to top"); |
0 | 248 |
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249 virtual_space()->verify(); |
0 | 250 } |
251 #endif | |
252 | |
253 void PSYoungGen::resize(size_t eden_size, size_t survivor_size) { | |
254 // Resize the generation if needed. If the generation resize | |
255 // reports false, do not attempt to resize the spaces. | |
256 if (resize_generation(eden_size, survivor_size)) { | |
257 // Then we lay out the spaces inside the generation | |
258 resize_spaces(eden_size, survivor_size); | |
259 | |
260 space_invariants(); | |
261 | |
262 if (PrintAdaptiveSizePolicy && Verbose) { | |
263 gclog_or_tty->print_cr("Young generation size: " | |
264 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
265 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
266 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
267 eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(), | |
268 _max_gen_size, min_gen_size()); | |
269 } | |
270 } | |
271 } | |
272 | |
273 | |
274 bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
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275 const size_t alignment = virtual_space()->alignment(); |
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276 size_t orig_size = virtual_space()->committed_size(); |
0 | 277 bool size_changed = false; |
278 | |
279 // There used to be this guarantee there. | |
280 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
281 // Code below forces this requirement. In addition the desired eden | |
282 // size and disired survivor sizes are desired goals and may | |
283 // exceed the total generation size. | |
284 | |
285 assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking"); | |
286 | |
287 // Adjust new generation size | |
288 const size_t eden_plus_survivors = | |
289 align_size_up(eden_size + 2 * survivor_size, alignment); | |
290 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()), | |
291 min_gen_size()); | |
292 assert(desired_size <= max_size(), "just checking"); | |
293 | |
294 if (desired_size > orig_size) { | |
295 // Grow the generation | |
296 size_t change = desired_size - orig_size; | |
297 assert(change % alignment == 0, "just checking"); | |
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298 HeapWord* prev_high = (HeapWord*) virtual_space()->high(); |
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299 if (!virtual_space()->expand_by(change)) { |
0 | 300 return false; // Error if we fail to resize! |
301 } | |
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302 if (ZapUnusedHeapArea) { |
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303 // Mangle newly committed space immediately because it |
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304 // can be done here more simply that after the new |
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305 // spaces have been computed. |
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306 HeapWord* new_high = (HeapWord*) virtual_space()->high(); |
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307 MemRegion mangle_region(prev_high, new_high); |
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308 SpaceMangler::mangle_region(mangle_region); |
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309 } |
0 | 310 size_changed = true; |
311 } else if (desired_size < orig_size) { | |
312 size_t desired_change = orig_size - desired_size; | |
313 assert(desired_change % alignment == 0, "just checking"); | |
314 | |
315 desired_change = limit_gen_shrink(desired_change); | |
316 | |
317 if (desired_change > 0) { | |
318 virtual_space()->shrink_by(desired_change); | |
319 reset_survivors_after_shrink(); | |
320 | |
321 size_changed = true; | |
322 } | |
323 } else { | |
324 if (Verbose && PrintGC) { | |
325 if (orig_size == gen_size_limit()) { | |
326 gclog_or_tty->print_cr("PSYoung generation size at maximum: " | |
327 SIZE_FORMAT "K", orig_size/K); | |
328 } else if (orig_size == min_gen_size()) { | |
329 gclog_or_tty->print_cr("PSYoung generation size at minium: " | |
330 SIZE_FORMAT "K", orig_size/K); | |
331 } | |
332 } | |
333 } | |
334 | |
335 if (size_changed) { | |
336 post_resize(); | |
337 | |
338 if (Verbose && PrintGC) { | |
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339 size_t current_size = virtual_space()->committed_size(); |
0 | 340 gclog_or_tty->print_cr("PSYoung generation size changed: " |
341 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
342 orig_size/K, current_size/K); | |
343 } | |
344 } | |
345 | |
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346 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || |
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347 virtual_space()->committed_size() == max_size(), "Sanity"); |
0 | 348 |
349 return true; | |
350 } | |
351 | |
263
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352 #ifndef PRODUCT |
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353 // In the numa case eden is not mangled so a survivor space |
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354 // moving into a region previously occupied by a survivor |
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355 // may find an unmangled region. Also in the PS case eden |
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356 // to-space and from-space may not touch (i.e., there may be |
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357 // gaps between them due to movement while resizing the |
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358 // spaces). Those gaps must be mangled. |
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359 void PSYoungGen::mangle_survivors(MutableSpace* s1, |
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360 MemRegion s1MR, |
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361 MutableSpace* s2, |
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362 MemRegion s2MR) { |
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363 // Check eden and gap between eden and from-space, in deciding |
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364 // what to mangle in from-space. Check the gap between from-space |
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365 // and to-space when deciding what to mangle. |
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366 // |
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367 // +--------+ +----+ +---+ |
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368 // | eden | |s1 | |s2 | |
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369 // +--------+ +----+ +---+ |
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370 // +-------+ +-----+ |
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371 // |s1MR | |s2MR | |
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372 // +-------+ +-----+ |
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373 // All of survivor-space is properly mangled so find the |
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374 // upper bound on the mangling for any portion above current s1. |
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375 HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end()); |
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376 MemRegion delta1_left; |
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377 if (s1MR.start() < delta_end) { |
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378 delta1_left = MemRegion(s1MR.start(), delta_end); |
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379 s1->mangle_region(delta1_left); |
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380 } |
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381 // Find any portion to the right of the current s1. |
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382 HeapWord* delta_start = MAX2(s1->end(), s1MR.start()); |
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383 MemRegion delta1_right; |
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384 if (delta_start < s1MR.end()) { |
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385 delta1_right = MemRegion(delta_start, s1MR.end()); |
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386 s1->mangle_region(delta1_right); |
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387 } |
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388 |
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389 // Similarly for the second survivor space except that |
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390 // any of the new region that overlaps with the current |
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391 // region of the first survivor space has already been |
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392 // mangled. |
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393 delta_end = MIN2(s2->bottom(), s2MR.end()); |
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394 delta_start = MAX2(s2MR.start(), s1->end()); |
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395 MemRegion delta2_left; |
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396 if (s2MR.start() < delta_end) { |
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397 delta2_left = MemRegion(s2MR.start(), delta_end); |
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398 s2->mangle_region(delta2_left); |
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399 } |
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400 delta_start = MAX2(s2->end(), s2MR.start()); |
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401 MemRegion delta2_right; |
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402 if (delta_start < s2MR.end()) { |
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403 s2->mangle_region(delta2_right); |
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404 } |
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405 |
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406 if (TraceZapUnusedHeapArea) { |
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407 // s1 |
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408 gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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409 "New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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410 s1->bottom(), s1->end(), s1MR.start(), s1MR.end()); |
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411 gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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412 PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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413 delta1_left.start(), delta1_left.end(), delta1_right.start(), |
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414 delta1_right.end()); |
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415 |
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416 // s2 |
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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 s2->bottom(), s2->end(), s2MR.start(), s2MR.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 delta2_left.start(), delta2_left.end(), delta2_right.start(), |
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423 delta2_right.end()); |
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424 } |
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425 |
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426 } |
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427 #endif // NOT PRODUCT |
0 | 428 |
429 void PSYoungGen::resize_spaces(size_t requested_eden_size, | |
430 size_t requested_survivor_size) { | |
431 assert(UseAdaptiveSizePolicy, "sanity check"); | |
432 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
433 "just checking"); | |
434 | |
435 // We require eden and to space to be empty | |
436 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
437 return; | |
438 } | |
439 | |
440 if (PrintAdaptiveSizePolicy && Verbose) { | |
441 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
442 SIZE_FORMAT | |
443 ", requested_survivor_size: " SIZE_FORMAT ")", | |
444 requested_eden_size, requested_survivor_size); | |
445 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
446 SIZE_FORMAT, | |
447 eden_space()->bottom(), | |
448 eden_space()->end(), | |
449 pointer_delta(eden_space()->end(), | |
450 eden_space()->bottom(), | |
451 sizeof(char))); | |
452 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
453 SIZE_FORMAT, | |
454 from_space()->bottom(), | |
455 from_space()->end(), | |
456 pointer_delta(from_space()->end(), | |
457 from_space()->bottom(), | |
458 sizeof(char))); | |
459 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
460 SIZE_FORMAT, | |
461 to_space()->bottom(), | |
462 to_space()->end(), | |
463 pointer_delta( to_space()->end(), | |
464 to_space()->bottom(), | |
465 sizeof(char))); | |
466 } | |
467 | |
468 // There's nothing to do if the new sizes are the same as the current | |
469 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
470 requested_survivor_size == from_space()->capacity_in_bytes() && | |
471 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
472 if (PrintAdaptiveSizePolicy && Verbose) { | |
473 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
474 } | |
475 return; | |
476 } | |
477 | |
478 char* eden_start = (char*)eden_space()->bottom(); | |
479 char* eden_end = (char*)eden_space()->end(); | |
480 char* from_start = (char*)from_space()->bottom(); | |
481 char* from_end = (char*)from_space()->end(); | |
482 char* to_start = (char*)to_space()->bottom(); | |
483 char* to_end = (char*)to_space()->end(); | |
484 | |
485 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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486 const size_t alignment = heap->intra_heap_alignment(); |
0 | 487 const bool maintain_minimum = |
488 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
489 | |
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490 bool eden_from_to_order = from_start < to_start; |
0 | 491 // Check whether from space is below to space |
263
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492 if (eden_from_to_order) { |
0 | 493 // Eden, from, to |
263
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494 eden_from_to_order = true; |
0 | 495 if (PrintAdaptiveSizePolicy && Verbose) { |
496 gclog_or_tty->print_cr(" Eden, from, to:"); | |
497 } | |
498 | |
499 // Set eden | |
500 // "requested_eden_size" is a goal for the size of eden | |
501 // and may not be attainable. "eden_size" below is | |
502 // calculated based on the location of from-space and | |
503 // the goal for the size of eden. from-space is | |
504 // fixed in place because it contains live data. | |
505 // The calculation is done this way to avoid 32bit | |
506 // overflow (i.e., eden_start + requested_eden_size | |
507 // may too large for representation in 32bits). | |
508 size_t eden_size; | |
509 if (maintain_minimum) { | |
510 // Only make eden larger than the requested size if | |
511 // the minimum size of the generation has to be maintained. | |
512 // This could be done in general but policy at a higher | |
513 // level is determining a requested size for eden and that | |
514 // should be honored unless there is a fundamental reason. | |
515 eden_size = pointer_delta(from_start, | |
516 eden_start, | |
517 sizeof(char)); | |
518 } else { | |
519 eden_size = MIN2(requested_eden_size, | |
520 pointer_delta(from_start, eden_start, sizeof(char))); | |
521 } | |
522 | |
523 eden_end = eden_start + eden_size; | |
524 assert(eden_end >= eden_start, "addition overflowed") | |
525 | |
526 // To may resize into from space as long as it is clear of live data. | |
527 // From space must remain page aligned, though, so we need to do some | |
528 // extra calculations. | |
529 | |
530 // First calculate an optimal to-space | |
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531 to_end = (char*)virtual_space()->high(); |
0 | 532 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
533 sizeof(char)); | |
534 | |
535 // Does the optimal to-space overlap from-space? | |
536 if (to_start < (char*)from_space()->end()) { | |
537 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
538 | |
539 // Calculate the minimum offset possible for from_end | |
540 size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
541 | |
542 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
543 if (from_size == 0) { | |
544 from_size = alignment; | |
545 } else { | |
546 from_size = align_size_up(from_size, alignment); | |
547 } | |
548 | |
549 from_end = from_start + from_size; | |
550 assert(from_end > from_start, "addition overflow or from_size problem"); | |
551 | |
552 guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right"); | |
553 | |
554 // Now update to_start with the new from_end | |
555 to_start = MAX2(from_end, to_start); | |
556 } | |
557 | |
558 guarantee(to_start != to_end, "to space is zero sized"); | |
559 | |
560 if (PrintAdaptiveSizePolicy && Verbose) { | |
561 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
562 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
563 eden_start, | |
564 eden_end, | |
565 pointer_delta(eden_end, eden_start, sizeof(char))); | |
566 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
567 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
568 from_start, | |
569 from_end, | |
570 pointer_delta(from_end, from_start, sizeof(char))); | |
571 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
572 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
573 to_start, | |
574 to_end, | |
575 pointer_delta( to_end, to_start, sizeof(char))); | |
576 } | |
577 } else { | |
578 // Eden, to, from | |
579 if (PrintAdaptiveSizePolicy && Verbose) { | |
580 gclog_or_tty->print_cr(" Eden, to, from:"); | |
581 } | |
582 | |
583 // To space gets priority over eden resizing. Note that we position | |
584 // to space as if we were able to resize from space, even though from | |
585 // space is not modified. | |
586 // Giving eden priority was tried and gave poorer performance. | |
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587 to_end = (char*)pointer_delta(virtual_space()->high(), |
0 | 588 (char*)requested_survivor_size, |
589 sizeof(char)); | |
590 to_end = MIN2(to_end, from_start); | |
591 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
592 sizeof(char)); | |
593 // if the space sizes are to be increased by several times then | |
594 // 'to_start' will point beyond the young generation. In this case | |
595 // 'to_start' should be adjusted. | |
596 to_start = MAX2(to_start, eden_start + alignment); | |
597 | |
598 // Compute how big eden can be, then adjust end. | |
599 // See comments above on calculating eden_end. | |
600 size_t eden_size; | |
601 if (maintain_minimum) { | |
602 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); | |
603 } else { | |
604 eden_size = MIN2(requested_eden_size, | |
605 pointer_delta(to_start, eden_start, sizeof(char))); | |
606 } | |
607 eden_end = eden_start + eden_size; | |
608 assert(eden_end >= eden_start, "addition overflowed") | |
609 | |
610 // Could choose to not let eden shrink | |
611 // to_start = MAX2(to_start, eden_end); | |
612 | |
613 // Don't let eden shrink down to 0 or less. | |
614 eden_end = MAX2(eden_end, eden_start + alignment); | |
615 to_start = MAX2(to_start, eden_end); | |
616 | |
617 if (PrintAdaptiveSizePolicy && Verbose) { | |
618 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
619 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
620 eden_start, | |
621 eden_end, | |
622 pointer_delta(eden_end, eden_start, sizeof(char))); | |
623 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
624 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
625 to_start, | |
626 to_end, | |
627 pointer_delta( to_end, to_start, sizeof(char))); | |
628 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
629 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
630 from_start, | |
631 from_end, | |
632 pointer_delta(from_end, from_start, sizeof(char))); | |
633 } | |
634 } | |
635 | |
636 | |
637 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
638 "from start moved to the right"); | |
639 guarantee((HeapWord*)from_end >= from_space()->top(), | |
640 "from end moved into live data"); | |
641 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
642 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
643 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
644 | |
645 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
646 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
647 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
648 | |
649 // Let's make sure the call to initialize doesn't reset "top"! | |
650 HeapWord* old_from_top = from_space()->top(); | |
651 | |
652 // For PrintAdaptiveSizePolicy block below | |
653 size_t old_from = from_space()->capacity_in_bytes(); | |
654 size_t old_to = to_space()->capacity_in_bytes(); | |
655 | |
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656 if (ZapUnusedHeapArea) { |
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657 // NUMA is a special case because a numa space is not mangled |
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658 // in order to not prematurely bind its address to memory to |
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659 // the wrong memory (i.e., don't want the GC thread to first |
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660 // touch the memory). The survivor spaces are not numa |
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661 // spaces and are mangled. |
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662 if (UseNUMA) { |
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663 if (eden_from_to_order) { |
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664 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
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665 } else { |
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666 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
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667 } |
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668 } |
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669 |
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670 // If not mangling the spaces, do some checking to verify that |
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671 // the spaces are already mangled. |
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672 // The spaces should be correctly mangled at this point so |
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673 // do some checking here. Note that they are not being mangled |
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674 // in the calls to initialize(). |
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675 // Must check mangling before the spaces are reshaped. Otherwise, |
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676 // the bottom or end of one space may have moved into an area |
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677 // covered by another space and a failure of the check may |
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678 // not correctly indicate which space is not properly mangled. |
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679 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
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680 eden_space()->check_mangled_unused_area(limit); |
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681 from_space()->check_mangled_unused_area(limit); |
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682 to_space()->check_mangled_unused_area(limit); |
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683 } |
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684 // When an existing space is being initialized, it is not |
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685 // mangled because the space has been previously mangled. |
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686 eden_space()->initialize(edenMR, |
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687 SpaceDecorator::Clear, |
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688 SpaceDecorator::DontMangle); |
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689 to_space()->initialize(toMR, |
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690 SpaceDecorator::Clear, |
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691 SpaceDecorator::DontMangle); |
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692 from_space()->initialize(fromMR, |
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693 SpaceDecorator::DontClear, |
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694 SpaceDecorator::DontMangle); |
0 | 695 |
696 assert(from_space()->top() == old_from_top, "from top changed!"); | |
697 | |
698 if (PrintAdaptiveSizePolicy) { | |
699 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
700 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
701 | |
702 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
703 "collection: %d " | |
704 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
705 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
706 heap->total_collections(), | |
707 old_from, old_to, | |
708 from_space()->capacity_in_bytes(), | |
709 to_space()->capacity_in_bytes()); | |
710 gclog_or_tty->cr(); | |
711 } | |
712 } | |
713 | |
714 void PSYoungGen::swap_spaces() { | |
715 MutableSpace* s = from_space(); | |
716 _from_space = to_space(); | |
717 _to_space = s; | |
718 | |
719 // Now update the decorators. | |
720 PSMarkSweepDecorator* md = from_mark_sweep(); | |
721 _from_mark_sweep = to_mark_sweep(); | |
722 _to_mark_sweep = md; | |
723 | |
724 assert(from_mark_sweep()->space() == from_space(), "Sanity"); | |
725 assert(to_mark_sweep()->space() == to_space(), "Sanity"); | |
726 } | |
727 | |
728 size_t PSYoungGen::capacity_in_bytes() const { | |
729 return eden_space()->capacity_in_bytes() | |
730 + from_space()->capacity_in_bytes(); // to_space() is only used during scavenge | |
731 } | |
732 | |
733 | |
734 size_t PSYoungGen::used_in_bytes() const { | |
735 return eden_space()->used_in_bytes() | |
736 + from_space()->used_in_bytes(); // to_space() is only used during scavenge | |
737 } | |
738 | |
739 | |
740 size_t PSYoungGen::free_in_bytes() const { | |
741 return eden_space()->free_in_bytes() | |
742 + from_space()->free_in_bytes(); // to_space() is only used during scavenge | |
743 } | |
744 | |
745 size_t PSYoungGen::capacity_in_words() const { | |
746 return eden_space()->capacity_in_words() | |
747 + from_space()->capacity_in_words(); // to_space() is only used during scavenge | |
748 } | |
749 | |
750 | |
751 size_t PSYoungGen::used_in_words() const { | |
752 return eden_space()->used_in_words() | |
753 + from_space()->used_in_words(); // to_space() is only used during scavenge | |
754 } | |
755 | |
756 | |
757 size_t PSYoungGen::free_in_words() const { | |
758 return eden_space()->free_in_words() | |
759 + from_space()->free_in_words(); // to_space() is only used during scavenge | |
760 } | |
761 | |
762 void PSYoungGen::object_iterate(ObjectClosure* blk) { | |
763 eden_space()->object_iterate(blk); | |
764 from_space()->object_iterate(blk); | |
765 to_space()->object_iterate(blk); | |
766 } | |
767 | |
768 void PSYoungGen::precompact() { | |
769 eden_mark_sweep()->precompact(); | |
770 from_mark_sweep()->precompact(); | |
771 to_mark_sweep()->precompact(); | |
772 } | |
773 | |
774 void PSYoungGen::adjust_pointers() { | |
775 eden_mark_sweep()->adjust_pointers(); | |
776 from_mark_sweep()->adjust_pointers(); | |
777 to_mark_sweep()->adjust_pointers(); | |
778 } | |
779 | |
780 void PSYoungGen::compact() { | |
781 eden_mark_sweep()->compact(ZapUnusedHeapArea); | |
782 from_mark_sweep()->compact(ZapUnusedHeapArea); | |
783 // Mark sweep stores preserved markOops in to space, don't disturb! | |
784 to_mark_sweep()->compact(false); | |
785 } | |
786 | |
787 void PSYoungGen::move_and_update(ParCompactionManager* cm) { | |
788 PSParallelCompact::move_and_update(cm, PSParallelCompact::eden_space_id); | |
789 PSParallelCompact::move_and_update(cm, PSParallelCompact::from_space_id); | |
790 PSParallelCompact::move_and_update(cm, PSParallelCompact::to_space_id); | |
791 } | |
792 | |
793 void PSYoungGen::print() const { print_on(tty); } | |
794 void PSYoungGen::print_on(outputStream* st) const { | |
795 st->print(" %-15s", "PSYoungGen"); | |
796 if (PrintGCDetails && Verbose) { | |
797 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
798 capacity_in_bytes(), used_in_bytes()); | |
799 } else { | |
800 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
801 capacity_in_bytes()/K, used_in_bytes()/K); | |
802 } | |
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803 virtual_space()->print_space_boundaries_on(st); |
0 | 804 st->print(" eden"); eden_space()->print_on(st); |
805 st->print(" from"); from_space()->print_on(st); | |
806 st->print(" to "); to_space()->print_on(st); | |
807 } | |
808 | |
809 void PSYoungGen::print_used_change(size_t prev_used) const { | |
810 gclog_or_tty->print(" [%s:", name()); | |
811 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
812 "->" SIZE_FORMAT "K" | |
813 "(" SIZE_FORMAT "K)", | |
814 prev_used / K, used_in_bytes() / K, | |
815 capacity_in_bytes() / K); | |
816 gclog_or_tty->print("]"); | |
817 } | |
818 | |
819 size_t PSYoungGen::available_for_expansion() { | |
820 ShouldNotReachHere(); | |
821 return 0; | |
822 } | |
823 | |
824 size_t PSYoungGen::available_for_contraction() { | |
825 ShouldNotReachHere(); | |
826 return 0; | |
827 } | |
828 | |
829 size_t PSYoungGen::available_to_min_gen() { | |
830 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
831 return virtual_space()->committed_size() - min_gen_size(); | |
832 } | |
833 | |
834 // This method assumes that from-space has live data and that | |
835 // any shrinkage of the young gen is limited by location of | |
836 // from-space. | |
837 size_t PSYoungGen::available_to_live() { | |
838 size_t delta_in_survivor = 0; | |
839 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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840 const size_t space_alignment = heap->intra_heap_alignment(); |
0 | 841 const size_t gen_alignment = heap->young_gen_alignment(); |
842 | |
843 MutableSpace* space_shrinking = NULL; | |
844 if (from_space()->end() > to_space()->end()) { | |
845 space_shrinking = from_space(); | |
846 } else { | |
847 space_shrinking = to_space(); | |
848 } | |
849 | |
850 // Include any space that is committed but not included in | |
851 // the survivor spaces. | |
852 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
853 "Survivor space beyond high end"); | |
854 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
855 space_shrinking->end(), sizeof(char)); | |
856 | |
857 if (space_shrinking->is_empty()) { | |
858 // Don't let the space shrink to 0 | |
859 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
860 "Space is too small"); | |
861 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
862 } else { | |
863 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
864 space_shrinking->top(), | |
865 sizeof(char)); | |
866 } | |
867 | |
868 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
869 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
870 return delta_in_bytes; | |
871 } | |
872 | |
873 // Return the number of bytes available for resizing down the young | |
874 // generation. This is the minimum of | |
875 // input "bytes" | |
876 // bytes to the minimum young gen size | |
877 // bytes to the size currently being used + some small extra | |
878 size_t PSYoungGen::limit_gen_shrink(size_t bytes) { | |
879 // Allow shrinkage into the current eden but keep eden large enough | |
880 // to maintain the minimum young gen size | |
881 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
882 return align_size_down(bytes, virtual_space()->alignment()); | |
883 } | |
884 | |
885 void PSYoungGen::reset_after_change() { | |
886 ShouldNotReachHere(); | |
887 } | |
888 | |
889 void PSYoungGen::reset_survivors_after_shrink() { | |
890 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
891 (HeapWord*)virtual_space()->high_boundary()); | |
892 PSScavenge::reference_processor()->set_span(_reserved); | |
893 | |
894 MutableSpace* space_shrinking = NULL; | |
895 if (from_space()->end() > to_space()->end()) { | |
896 space_shrinking = from_space(); | |
897 } else { | |
898 space_shrinking = to_space(); | |
899 } | |
900 | |
901 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
902 assert(new_end >= space_shrinking->bottom(), "Shrink was too large"); | |
903 // Was there a shrink of the survivor space? | |
904 if (new_end < space_shrinking->end()) { | |
905 MemRegion mr(space_shrinking->bottom(), new_end); | |
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906 space_shrinking->initialize(mr, |
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907 SpaceDecorator::DontClear, |
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908 SpaceDecorator::Mangle); |
0 | 909 } |
910 } | |
911 | |
912 // This method currently does not expect to expand into eden (i.e., | |
913 // the virtual space boundaries is expected to be consistent | |
914 // with the eden boundaries.. | |
915 void PSYoungGen::post_resize() { | |
916 assert_locked_or_safepoint(Heap_lock); | |
917 assert((eden_space()->bottom() < to_space()->bottom()) && | |
918 (eden_space()->bottom() < from_space()->bottom()), | |
919 "Eden is assumed to be below the survivor spaces"); | |
920 | |
921 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
922 (HeapWord*)virtual_space()->high()); | |
923 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
924 space_invariants(); | |
925 } | |
926 | |
927 | |
928 | |
929 void PSYoungGen::update_counters() { | |
930 if (UsePerfData) { | |
931 _eden_counters->update_all(); | |
932 _from_counters->update_all(); | |
933 _to_counters->update_all(); | |
934 _gen_counters->update_all(); | |
935 } | |
936 } | |
937 | |
938 void PSYoungGen::verify(bool allow_dirty) { | |
939 eden_space()->verify(allow_dirty); | |
940 from_space()->verify(allow_dirty); | |
941 to_space()->verify(allow_dirty); | |
942 } | |
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943 |
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944 #ifndef PRODUCT |
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945 void PSYoungGen::record_spaces_top() { |
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946 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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947 eden_space()->set_top_for_allocations(); |
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948 from_space()->set_top_for_allocations(); |
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949 to_space()->set_top_for_allocations(); |
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950 } |
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951 #endif |