Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.cpp @ 1286:ab75c83d7c37
Merge
author | johnc |
---|---|
date | Tue, 02 Mar 2010 13:57:46 -0800 |
parents | 850fdf70db2b |
children | cff162798819 |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_asPSYoungGen.cpp.incl" | |
27 | |
28 ASPSYoungGen::ASPSYoungGen(size_t init_byte_size, | |
29 size_t minimum_byte_size, | |
30 size_t byte_size_limit) : | |
31 PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
32 _gen_size_limit(byte_size_limit) { | |
33 } | |
34 | |
35 | |
36 ASPSYoungGen::ASPSYoungGen(PSVirtualSpace* vs, | |
37 size_t init_byte_size, | |
38 size_t minimum_byte_size, | |
39 size_t byte_size_limit) : | |
40 //PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
41 PSYoungGen(vs->committed_size(), minimum_byte_size, byte_size_limit), | |
42 _gen_size_limit(byte_size_limit) { | |
43 | |
44 assert(vs->committed_size() == init_byte_size, "Cannot replace with"); | |
45 | |
46 _virtual_space = vs; | |
47 } | |
48 | |
49 void ASPSYoungGen::initialize_virtual_space(ReservedSpace rs, | |
50 size_t alignment) { | |
51 assert(_init_gen_size != 0, "Should have a finite size"); | |
52 _virtual_space = new PSVirtualSpaceHighToLow(rs, alignment); | |
53 if (!_virtual_space->expand_by(_init_gen_size)) { | |
54 vm_exit_during_initialization("Could not reserve enough space for " | |
55 "object heap"); | |
56 } | |
57 } | |
58 | |
59 void ASPSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
60 initialize_virtual_space(rs, alignment); | |
61 initialize_work(); | |
62 } | |
63 | |
64 size_t ASPSYoungGen::available_for_expansion() { | |
65 | |
66 size_t current_committed_size = virtual_space()->committed_size(); | |
67 assert((gen_size_limit() >= current_committed_size), | |
68 "generation size limit is wrong"); | |
69 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
70 size_t result = gen_size_limit() - current_committed_size; | |
71 size_t result_aligned = align_size_down(result, heap->young_gen_alignment()); | |
72 return result_aligned; | |
73 } | |
74 | |
75 // Return the number of bytes the young gen is willing give up. | |
76 // | |
77 // Future implementations could check the survivors and if to_space is in the | |
78 // right place (below from_space), take a chunk from to_space. | |
79 size_t ASPSYoungGen::available_for_contraction() { | |
80 | |
81 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
82 if (uncommitted_bytes != 0) { | |
83 return uncommitted_bytes; | |
84 } | |
85 | |
86 if (eden_space()->is_empty()) { | |
87 // Respect the minimum size for eden and for the young gen as a whole. | |
88 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
89 const size_t eden_alignment = heap->intra_heap_alignment(); |
0 | 90 const size_t gen_alignment = heap->young_gen_alignment(); |
91 | |
92 assert(eden_space()->capacity_in_bytes() >= eden_alignment, | |
93 "Alignment is wrong"); | |
94 size_t eden_avail = eden_space()->capacity_in_bytes() - eden_alignment; | |
95 eden_avail = align_size_down(eden_avail, gen_alignment); | |
96 | |
97 assert(virtual_space()->committed_size() >= min_gen_size(), | |
98 "minimum gen size is wrong"); | |
99 size_t gen_avail = virtual_space()->committed_size() - min_gen_size(); | |
100 assert(virtual_space()->is_aligned(gen_avail), "not aligned"); | |
101 | |
102 const size_t max_contraction = MIN2(eden_avail, gen_avail); | |
103 // See comment for ASPSOldGen::available_for_contraction() | |
104 // for reasons the "increment" fraction is used. | |
105 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
106 size_t result = policy->eden_increment_aligned_down(max_contraction); | |
107 size_t result_aligned = align_size_down(result, gen_alignment); | |
108 if (PrintAdaptiveSizePolicy && Verbose) { | |
109 gclog_or_tty->print_cr("ASPSYoungGen::available_for_contraction: %d K", | |
110 result_aligned/K); | |
111 gclog_or_tty->print_cr(" max_contraction %d K", max_contraction/K); | |
112 gclog_or_tty->print_cr(" eden_avail %d K", eden_avail/K); | |
113 gclog_or_tty->print_cr(" gen_avail %d K", gen_avail/K); | |
114 } | |
115 return result_aligned; | |
116 | |
117 } | |
118 | |
119 return 0; | |
120 } | |
121 | |
122 // The current implementation only considers to the end of eden. | |
123 // If to_space is below from_space, to_space is not considered. | |
124 // to_space can be. | |
125 size_t ASPSYoungGen::available_to_live() { | |
126 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
127 const size_t alignment = heap->intra_heap_alignment(); |
0 | 128 |
129 // Include any space that is committed but is not in eden. | |
130 size_t available = pointer_delta(eden_space()->bottom(), | |
131 virtual_space()->low(), | |
132 sizeof(char)); | |
133 | |
134 const size_t eden_capacity = eden_space()->capacity_in_bytes(); | |
135 if (eden_space()->is_empty() && eden_capacity > alignment) { | |
136 available += eden_capacity - alignment; | |
137 } | |
138 return available; | |
139 } | |
140 | |
141 // Similar to PSYoungGen::resize_generation() but | |
142 // allows sum of eden_size and 2 * survivor_size to exceed _max_gen_size | |
143 // expands at the low end of the virtual space | |
144 // moves the boundary between the generations in order to expand | |
145 // some additional diagnostics | |
146 // If no additional changes are required, this can be deleted | |
147 // and the changes factored back into PSYoungGen::resize_generation(). | |
148 bool ASPSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
149 const size_t alignment = virtual_space()->alignment(); | |
150 size_t orig_size = virtual_space()->committed_size(); | |
151 bool size_changed = false; | |
152 | |
153 // There used to be a guarantee here that | |
154 // (eden_size + 2*survivor_size) <= _max_gen_size | |
155 // This requirement is enforced by the calculation of desired_size | |
156 // below. It may not be true on entry since the size of the | |
157 // eden_size is no bounded by the generation size. | |
158 | |
159 assert(max_size() == reserved().byte_size(), "max gen size problem?"); | |
160 assert(min_gen_size() <= orig_size && orig_size <= max_size(), | |
161 "just checking"); | |
162 | |
163 // Adjust new generation size | |
164 const size_t eden_plus_survivors = | |
165 align_size_up(eden_size + 2 * survivor_size, alignment); | |
166 size_t desired_size = MAX2(MIN2(eden_plus_survivors, gen_size_limit()), | |
167 min_gen_size()); | |
168 assert(desired_size <= gen_size_limit(), "just checking"); | |
169 | |
170 if (desired_size > orig_size) { | |
171 // Grow the generation | |
172 size_t change = desired_size - orig_size; | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
173 HeapWord* prev_low = (HeapWord*) virtual_space()->low(); |
0 | 174 if (!virtual_space()->expand_by(change)) { |
175 return false; | |
176 } | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
177 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
178 // Mangle newly committed space immediately because it |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
179 // can be done here more simply that after the new |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
180 // spaces have been computed. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
181 HeapWord* new_low = (HeapWord*) virtual_space()->low(); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
182 assert(new_low < prev_low, "Did not grow"); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
183 |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
184 MemRegion mangle_region(new_low, prev_low); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
185 SpaceMangler::mangle_region(mangle_region); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
186 } |
0 | 187 size_changed = true; |
188 } else if (desired_size < orig_size) { | |
189 size_t desired_change = orig_size - desired_size; | |
190 | |
191 // How much is available for shrinking. | |
192 size_t available_bytes = limit_gen_shrink(desired_change); | |
193 size_t change = MIN2(desired_change, available_bytes); | |
194 virtual_space()->shrink_by(change); | |
195 size_changed = true; | |
196 } else { | |
197 if (Verbose && PrintGC) { | |
198 if (orig_size == gen_size_limit()) { | |
199 gclog_or_tty->print_cr("ASPSYoung generation size at maximum: " | |
200 SIZE_FORMAT "K", orig_size/K); | |
201 } else if (orig_size == min_gen_size()) { | |
202 gclog_or_tty->print_cr("ASPSYoung generation size at minium: " | |
203 SIZE_FORMAT "K", orig_size/K); | |
204 } | |
205 } | |
206 } | |
207 | |
208 if (size_changed) { | |
209 reset_after_change(); | |
210 if (Verbose && PrintGC) { | |
211 size_t current_size = virtual_space()->committed_size(); | |
212 gclog_or_tty->print_cr("ASPSYoung generation size changed: " | |
213 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
214 orig_size/K, current_size/K); | |
215 } | |
216 } | |
217 | |
218 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
219 virtual_space()->committed_size() == max_size(), "Sanity"); | |
220 | |
221 return true; | |
222 } | |
223 | |
224 // Similar to PSYoungGen::resize_spaces() but | |
225 // eden always starts at the low end of the committed virtual space | |
226 // current implementation does not allow holes between the spaces | |
227 // _young_generation_boundary has to be reset because it changes. | |
228 // so additional verification | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
229 |
0 | 230 void ASPSYoungGen::resize_spaces(size_t requested_eden_size, |
231 size_t requested_survivor_size) { | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
232 assert(UseAdaptiveSizePolicy, "sanity check"); |
0 | 233 assert(requested_eden_size > 0 && requested_survivor_size > 0, |
234 "just checking"); | |
235 | |
236 space_invariants(); | |
237 | |
238 // We require eden and to space to be empty | |
239 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
240 return; | |
241 } | |
242 | |
243 if (PrintAdaptiveSizePolicy && Verbose) { | |
244 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
245 SIZE_FORMAT | |
246 ", requested_survivor_size: " SIZE_FORMAT ")", | |
247 requested_eden_size, requested_survivor_size); | |
248 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
249 SIZE_FORMAT, | |
250 eden_space()->bottom(), | |
251 eden_space()->end(), | |
252 pointer_delta(eden_space()->end(), | |
253 eden_space()->bottom(), | |
254 sizeof(char))); | |
255 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
256 SIZE_FORMAT, | |
257 from_space()->bottom(), | |
258 from_space()->end(), | |
259 pointer_delta(from_space()->end(), | |
260 from_space()->bottom(), | |
261 sizeof(char))); | |
262 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
263 SIZE_FORMAT, | |
264 to_space()->bottom(), | |
265 to_space()->end(), | |
266 pointer_delta( to_space()->end(), | |
267 to_space()->bottom(), | |
268 sizeof(char))); | |
269 } | |
270 | |
271 // There's nothing to do if the new sizes are the same as the current | |
272 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
273 requested_survivor_size == from_space()->capacity_in_bytes() && | |
274 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
275 if (PrintAdaptiveSizePolicy && Verbose) { | |
276 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
277 } | |
278 return; | |
279 } | |
280 | |
281 char* eden_start = (char*)virtual_space()->low(); | |
282 char* eden_end = (char*)eden_space()->end(); | |
283 char* from_start = (char*)from_space()->bottom(); | |
284 char* from_end = (char*)from_space()->end(); | |
285 char* to_start = (char*)to_space()->bottom(); | |
286 char* to_end = (char*)to_space()->end(); | |
287 | |
288 assert(eden_start < from_start, "Cannot push into from_space"); | |
289 | |
290 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
13
183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
0
diff
changeset
|
291 const size_t alignment = heap->intra_heap_alignment(); |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
292 const bool maintain_minimum = |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
293 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); |
0 | 294 |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
295 bool eden_from_to_order = from_start < to_start; |
0 | 296 // Check whether from space is below to space |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
297 if (eden_from_to_order) { |
0 | 298 // Eden, from, to |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
299 |
0 | 300 if (PrintAdaptiveSizePolicy && Verbose) { |
301 gclog_or_tty->print_cr(" Eden, from, to:"); | |
302 } | |
303 | |
304 // Set eden | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
305 // "requested_eden_size" is a goal for the size of eden |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
306 // and may not be attainable. "eden_size" below is |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
307 // calculated based on the location of from-space and |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
308 // the goal for the size of eden. from-space is |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
309 // fixed in place because it contains live data. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
310 // The calculation is done this way to avoid 32bit |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
311 // overflow (i.e., eden_start + requested_eden_size |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
312 // may too large for representation in 32bits). |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
313 size_t eden_size; |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
314 if (maintain_minimum) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
315 // Only make eden larger than the requested size if |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
316 // the minimum size of the generation has to be maintained. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
317 // This could be done in general but policy at a higher |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
318 // level is determining a requested size for eden and that |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
319 // should be honored unless there is a fundamental reason. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
320 eden_size = pointer_delta(from_start, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
321 eden_start, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
322 sizeof(char)); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
323 } else { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
324 eden_size = MIN2(requested_eden_size, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
325 pointer_delta(from_start, eden_start, sizeof(char))); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
326 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
327 |
0 | 328 eden_end = eden_start + eden_size; |
329 assert(eden_end >= eden_start, "addition overflowed") | |
330 | |
331 // To may resize into from space as long as it is clear of live data. | |
332 // From space must remain page aligned, though, so we need to do some | |
333 // extra calculations. | |
334 | |
335 // First calculate an optimal to-space | |
336 to_end = (char*)virtual_space()->high(); | |
337 to_start = (char*)pointer_delta(to_end, | |
338 (char*)requested_survivor_size, | |
339 sizeof(char)); | |
340 | |
341 // Does the optimal to-space overlap from-space? | |
342 if (to_start < (char*)from_space()->end()) { | |
343 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
344 | |
345 // Calculate the minimum offset possible for from_end | |
346 size_t from_size = | |
347 pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
348 | |
349 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
350 if (from_size == 0) { | |
351 from_size = alignment; | |
352 } else { | |
353 from_size = align_size_up(from_size, alignment); | |
354 } | |
355 | |
356 from_end = from_start + from_size; | |
357 assert(from_end > from_start, "addition overflow or from_size problem"); | |
358 | |
359 guarantee(from_end <= (char*)from_space()->end(), | |
360 "from_end moved to the right"); | |
361 | |
362 // Now update to_start with the new from_end | |
363 to_start = MAX2(from_end, to_start); | |
364 } | |
365 | |
366 guarantee(to_start != to_end, "to space is zero sized"); | |
367 | |
368 if (PrintAdaptiveSizePolicy && Verbose) { | |
369 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
370 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
371 eden_start, | |
372 eden_end, | |
373 pointer_delta(eden_end, eden_start, sizeof(char))); | |
374 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
375 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
376 from_start, | |
377 from_end, | |
378 pointer_delta(from_end, from_start, sizeof(char))); | |
379 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
380 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
381 to_start, | |
382 to_end, | |
383 pointer_delta( to_end, to_start, sizeof(char))); | |
384 } | |
385 } else { | |
386 // Eden, to, from | |
387 if (PrintAdaptiveSizePolicy && Verbose) { | |
388 gclog_or_tty->print_cr(" Eden, to, from:"); | |
389 } | |
390 | |
391 // To space gets priority over eden resizing. Note that we position | |
392 // to space as if we were able to resize from space, even though from | |
393 // space is not modified. | |
394 // Giving eden priority was tried and gave poorer performance. | |
395 to_end = (char*)pointer_delta(virtual_space()->high(), | |
396 (char*)requested_survivor_size, | |
397 sizeof(char)); | |
398 to_end = MIN2(to_end, from_start); | |
399 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
400 sizeof(char)); | |
401 // if the space sizes are to be increased by several times then | |
402 // 'to_start' will point beyond the young generation. In this case | |
403 // 'to_start' should be adjusted. | |
404 to_start = MAX2(to_start, eden_start + alignment); | |
405 | |
406 // Compute how big eden can be, then adjust end. | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
407 // See comments above on calculating eden_end. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
408 size_t eden_size; |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
409 if (maintain_minimum) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
410 eden_size = pointer_delta(to_start, eden_start, sizeof(char)); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
411 } else { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
412 eden_size = MIN2(requested_eden_size, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
413 pointer_delta(to_start, eden_start, sizeof(char))); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
414 } |
0 | 415 eden_end = eden_start + eden_size; |
416 assert(eden_end >= eden_start, "addition overflowed") | |
417 | |
418 // Don't let eden shrink down to 0 or less. | |
419 eden_end = MAX2(eden_end, eden_start + alignment); | |
420 to_start = MAX2(to_start, eden_end); | |
421 | |
422 if (PrintAdaptiveSizePolicy && Verbose) { | |
423 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
424 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
425 eden_start, | |
426 eden_end, | |
427 pointer_delta(eden_end, eden_start, sizeof(char))); | |
428 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
429 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
430 to_start, | |
431 to_end, | |
432 pointer_delta( to_end, to_start, sizeof(char))); | |
433 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
434 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
435 from_start, | |
436 from_end, | |
437 pointer_delta(from_end, from_start, sizeof(char))); | |
438 } | |
439 } | |
440 | |
441 | |
442 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
443 "from start moved to the right"); | |
444 guarantee((HeapWord*)from_end >= from_space()->top(), | |
445 "from end moved into live data"); | |
446 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
447 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
448 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
449 | |
450 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
451 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
452 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
453 | |
454 // Let's make sure the call to initialize doesn't reset "top"! | |
455 DEBUG_ONLY(HeapWord* old_from_top = from_space()->top();) | |
456 | |
457 // For PrintAdaptiveSizePolicy block below | |
458 size_t old_from = from_space()->capacity_in_bytes(); | |
459 size_t old_to = to_space()->capacity_in_bytes(); | |
460 | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
461 if (ZapUnusedHeapArea) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
462 // NUMA is a special case because a numa space is not mangled |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
463 // in order to not prematurely bind its address to memory to |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
464 // the wrong memory (i.e., don't want the GC thread to first |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
465 // touch the memory). The survivor spaces are not numa |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
466 // spaces and are mangled. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
467 if (UseNUMA) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
468 if (eden_from_to_order) { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
469 mangle_survivors(from_space(), fromMR, to_space(), toMR); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
470 } else { |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
471 mangle_survivors(to_space(), toMR, from_space(), fromMR); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
472 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
473 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
474 |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
475 // If not mangling the spaces, do some checking to verify that |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
476 // the spaces are already mangled. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
477 // The spaces should be correctly mangled at this point so |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
478 // do some checking here. Note that they are not being mangled |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
479 // in the calls to initialize(). |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
480 // Must check mangling before the spaces are reshaped. Otherwise, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
481 // the bottom or end of one space may have moved into an area |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
482 // covered by another space and a failure of the check may |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
483 // not correctly indicate which space is not properly mangled. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
484 |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
485 HeapWord* limit = (HeapWord*) virtual_space()->high(); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
486 eden_space()->check_mangled_unused_area(limit); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
487 from_space()->check_mangled_unused_area(limit); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
488 to_space()->check_mangled_unused_area(limit); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
489 } |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
490 // When an existing space is being initialized, it is not |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
491 // mangled because the space has been previously mangled. |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
492 eden_space()->initialize(edenMR, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
493 SpaceDecorator::Clear, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
494 SpaceDecorator::DontMangle); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
495 to_space()->initialize(toMR, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
496 SpaceDecorator::Clear, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
497 SpaceDecorator::DontMangle); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
498 from_space()->initialize(fromMR, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
499 SpaceDecorator::DontClear, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
500 SpaceDecorator::DontMangle); |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
501 |
0 | 502 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
503 | |
504 assert(from_space()->top() == old_from_top, "from top changed!"); | |
505 | |
506 if (PrintAdaptiveSizePolicy) { | |
507 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
508 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
509 | |
510 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
511 "collection: %d " | |
512 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
513 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
514 heap->total_collections(), | |
515 old_from, old_to, | |
516 from_space()->capacity_in_bytes(), | |
517 to_space()->capacity_in_bytes()); | |
518 gclog_or_tty->cr(); | |
519 } | |
520 space_invariants(); | |
521 } | |
522 void ASPSYoungGen::reset_after_change() { | |
523 assert_locked_or_safepoint(Heap_lock); | |
524 | |
525 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
526 (HeapWord*)virtual_space()->high_boundary()); | |
527 PSScavenge::reference_processor()->set_span(_reserved); | |
528 | |
529 HeapWord* new_eden_bottom = (HeapWord*)virtual_space()->low(); | |
530 HeapWord* eden_bottom = eden_space()->bottom(); | |
531 if (new_eden_bottom != eden_bottom) { | |
532 MemRegion eden_mr(new_eden_bottom, eden_space()->end()); | |
263
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
533 eden_space()->initialize(eden_mr, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
534 SpaceDecorator::Clear, |
12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
13
diff
changeset
|
535 SpaceDecorator::Mangle); |
0 | 536 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); |
537 } | |
538 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
539 (HeapWord*)virtual_space()->high()); | |
540 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
541 | |
542 space_invariants(); | |
543 } |