Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/parNew/asParNewGeneration.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 183f41cf8bfe |
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1 /* | |
2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. | |
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/_asParNewGeneration.cpp.incl" | |
27 | |
28 ASParNewGeneration::ASParNewGeneration(ReservedSpace rs, | |
29 size_t initial_byte_size, | |
30 size_t min_byte_size, | |
31 int level) : | |
32 ParNewGeneration(rs, initial_byte_size, level), | |
33 _min_gen_size(min_byte_size) {} | |
34 | |
35 const char* ASParNewGeneration::name() const { | |
36 return "adaptive size par new generation"; | |
37 } | |
38 | |
39 void ASParNewGeneration::adjust_desired_tenuring_threshold() { | |
40 assert(UseAdaptiveSizePolicy, | |
41 "Should only be used with UseAdaptiveSizePolicy"); | |
42 } | |
43 | |
44 void ASParNewGeneration::resize(size_t eden_size, size_t survivor_size) { | |
45 // Resize the generation if needed. If the generation resize | |
46 // reports false, do not attempt to resize the spaces. | |
47 if (resize_generation(eden_size, survivor_size)) { | |
48 // Then we lay out the spaces inside the generation | |
49 resize_spaces(eden_size, survivor_size); | |
50 | |
51 space_invariants(); | |
52 | |
53 if (PrintAdaptiveSizePolicy && Verbose) { | |
54 gclog_or_tty->print_cr("Young generation size: " | |
55 "desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT | |
56 " used: " SIZE_FORMAT " capacity: " SIZE_FORMAT | |
57 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
58 eden_size, survivor_size, used(), capacity(), | |
59 max_gen_size(), min_gen_size()); | |
60 } | |
61 } | |
62 } | |
63 | |
64 size_t ASParNewGeneration::available_to_min_gen() { | |
65 assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); | |
66 return virtual_space()->committed_size() - min_gen_size(); | |
67 } | |
68 | |
69 // This method assumes that from-space has live data and that | |
70 // any shrinkage of the young gen is limited by location of | |
71 // from-space. | |
72 size_t ASParNewGeneration::available_to_live() const { | |
73 #undef SHRINKS_AT_END_OF_EDEN | |
74 #ifdef SHRINKS_AT_END_OF_EDEN | |
75 size_t delta_in_survivor = 0; | |
76 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
77 const size_t space_alignment = heap->intra_generation_alignment(); | |
78 const size_t gen_alignment = heap->generation_alignment(); | |
79 | |
80 MutableSpace* space_shrinking = NULL; | |
81 if (from_space()->end() > to_space()->end()) { | |
82 space_shrinking = from_space(); | |
83 } else { | |
84 space_shrinking = to_space(); | |
85 } | |
86 | |
87 // Include any space that is committed but not included in | |
88 // the survivor spaces. | |
89 assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), | |
90 "Survivor space beyond high end"); | |
91 size_t unused_committed = pointer_delta(virtual_space()->high(), | |
92 space_shrinking->end(), sizeof(char)); | |
93 | |
94 if (space_shrinking->is_empty()) { | |
95 // Don't let the space shrink to 0 | |
96 assert(space_shrinking->capacity_in_bytes() >= space_alignment, | |
97 "Space is too small"); | |
98 delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; | |
99 } else { | |
100 delta_in_survivor = pointer_delta(space_shrinking->end(), | |
101 space_shrinking->top(), | |
102 sizeof(char)); | |
103 } | |
104 | |
105 size_t delta_in_bytes = unused_committed + delta_in_survivor; | |
106 delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); | |
107 return delta_in_bytes; | |
108 #else | |
109 // The only space available for shrinking is in to-space if it | |
110 // is above from-space. | |
111 if (to()->bottom() > from()->bottom()) { | |
112 const size_t alignment = os::vm_page_size(); | |
113 if (to()->capacity() < alignment) { | |
114 return 0; | |
115 } else { | |
116 return to()->capacity() - alignment; | |
117 } | |
118 } else { | |
119 return 0; | |
120 } | |
121 #endif | |
122 } | |
123 | |
124 // Return the number of bytes available for resizing down the young | |
125 // generation. This is the minimum of | |
126 // input "bytes" | |
127 // bytes to the minimum young gen size | |
128 // bytes to the size currently being used + some small extra | |
129 size_t ASParNewGeneration::limit_gen_shrink (size_t bytes) { | |
130 // Allow shrinkage into the current eden but keep eden large enough | |
131 // to maintain the minimum young gen size | |
132 bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); | |
133 return align_size_down(bytes, os::vm_page_size()); | |
134 } | |
135 | |
136 // Note that the the alignment used is the OS page size as | |
137 // opposed to an alignment associated with the virtual space | |
138 // (as is done in the ASPSYoungGen/ASPSOldGen) | |
139 bool ASParNewGeneration::resize_generation(size_t eden_size, | |
140 size_t survivor_size) { | |
141 const size_t alignment = os::vm_page_size(); | |
142 size_t orig_size = virtual_space()->committed_size(); | |
143 bool size_changed = false; | |
144 | |
145 // There used to be this guarantee there. | |
146 // guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); | |
147 // Code below forces this requirement. In addition the desired eden | |
148 // size and disired survivor sizes are desired goals and may | |
149 // exceed the total generation size. | |
150 | |
151 assert(min_gen_size() <= orig_size && orig_size <= max_gen_size(), | |
152 "just checking"); | |
153 | |
154 // Adjust new generation size | |
155 const size_t eden_plus_survivors = | |
156 align_size_up(eden_size + 2 * survivor_size, alignment); | |
157 size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_gen_size()), | |
158 min_gen_size()); | |
159 assert(desired_size <= max_gen_size(), "just checking"); | |
160 | |
161 if (desired_size > orig_size) { | |
162 // Grow the generation | |
163 size_t change = desired_size - orig_size; | |
164 assert(change % alignment == 0, "just checking"); | |
165 if (!virtual_space()->expand_by(change)) { | |
166 return false; // Error if we fail to resize! | |
167 } | |
168 | |
169 size_changed = true; | |
170 } else if (desired_size < orig_size) { | |
171 size_t desired_change = orig_size - desired_size; | |
172 assert(desired_change % alignment == 0, "just checking"); | |
173 | |
174 desired_change = limit_gen_shrink(desired_change); | |
175 | |
176 if (desired_change > 0) { | |
177 virtual_space()->shrink_by(desired_change); | |
178 reset_survivors_after_shrink(); | |
179 | |
180 size_changed = true; | |
181 } | |
182 } else { | |
183 if (Verbose && PrintGC) { | |
184 if (orig_size == max_gen_size()) { | |
185 gclog_or_tty->print_cr("ASParNew generation size at maximum: " | |
186 SIZE_FORMAT "K", orig_size/K); | |
187 } else if (orig_size == min_gen_size()) { | |
188 gclog_or_tty->print_cr("ASParNew generation size at minium: " | |
189 SIZE_FORMAT "K", orig_size/K); | |
190 } | |
191 } | |
192 } | |
193 | |
194 if (size_changed) { | |
195 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
196 (HeapWord*)virtual_space()->high()); | |
197 GenCollectedHeap::heap()->barrier_set()->resize_covered_region(cmr); | |
198 | |
199 if (Verbose && PrintGC) { | |
200 size_t current_size = virtual_space()->committed_size(); | |
201 gclog_or_tty->print_cr("ASParNew generation size changed: " | |
202 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
203 orig_size/K, current_size/K); | |
204 } | |
205 } | |
206 | |
207 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
208 virtual_space()->committed_size() == max_gen_size(), "Sanity"); | |
209 | |
210 return true; | |
211 } | |
212 | |
213 void ASParNewGeneration::reset_survivors_after_shrink() { | |
214 | |
215 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
216 HeapWord* new_end = (HeapWord*)virtual_space()->high(); | |
217 | |
218 if (from()->end() > to()->end()) { | |
219 assert(new_end >= from()->end(), "Shrinking past from-space"); | |
220 } else { | |
221 assert(new_end >= to()->bottom(), "Shrink was too large"); | |
222 // Was there a shrink of the survivor space? | |
223 if (new_end < to()->end()) { | |
224 MemRegion mr(to()->bottom(), new_end); | |
225 to()->initialize(mr, false /* clear */); | |
226 } | |
227 } | |
228 } | |
229 void ASParNewGeneration::resize_spaces(size_t requested_eden_size, | |
230 size_t requested_survivor_size) { | |
231 assert(UseAdaptiveSizePolicy, "sanity check"); | |
232 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
233 "just checking"); | |
234 CollectedHeap* heap = Universe::heap(); | |
235 assert(heap->kind() == CollectedHeap::GenCollectedHeap, "Sanity"); | |
236 | |
237 | |
238 // We require eden and to space to be empty | |
239 if ((!eden()->is_empty()) || (!to()->is_empty())) { | |
240 return; | |
241 } | |
242 | |
243 size_t cur_eden_size = eden()->capacity(); | |
244 | |
245 if (PrintAdaptiveSizePolicy && Verbose) { | |
246 gclog_or_tty->print_cr("ASParNew::resize_spaces(requested_eden_size: " | |
247 SIZE_FORMAT | |
248 ", requested_survivor_size: " SIZE_FORMAT ")", | |
249 requested_eden_size, requested_survivor_size); | |
250 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
251 SIZE_FORMAT, | |
252 eden()->bottom(), | |
253 eden()->end(), | |
254 pointer_delta(eden()->end(), | |
255 eden()->bottom(), | |
256 sizeof(char))); | |
257 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
258 SIZE_FORMAT, | |
259 from()->bottom(), | |
260 from()->end(), | |
261 pointer_delta(from()->end(), | |
262 from()->bottom(), | |
263 sizeof(char))); | |
264 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
265 SIZE_FORMAT, | |
266 to()->bottom(), | |
267 to()->end(), | |
268 pointer_delta( to()->end(), | |
269 to()->bottom(), | |
270 sizeof(char))); | |
271 } | |
272 | |
273 // There's nothing to do if the new sizes are the same as the current | |
274 if (requested_survivor_size == to()->capacity() && | |
275 requested_survivor_size == from()->capacity() && | |
276 requested_eden_size == eden()->capacity()) { | |
277 if (PrintAdaptiveSizePolicy && Verbose) { | |
278 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
279 } | |
280 return; | |
281 } | |
282 | |
283 char* eden_start = (char*)eden()->bottom(); | |
284 char* eden_end = (char*)eden()->end(); | |
285 char* from_start = (char*)from()->bottom(); | |
286 char* from_end = (char*)from()->end(); | |
287 char* to_start = (char*)to()->bottom(); | |
288 char* to_end = (char*)to()->end(); | |
289 | |
290 const size_t alignment = os::vm_page_size(); | |
291 const bool maintain_minimum = | |
292 (requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); | |
293 | |
294 // Check whether from space is below to space | |
295 if (from_start < to_start) { | |
296 // Eden, from, to | |
297 if (PrintAdaptiveSizePolicy && Verbose) { | |
298 gclog_or_tty->print_cr(" Eden, from, to:"); | |
299 } | |
300 | |
301 // Set eden | |
302 // "requested_eden_size" is a goal for the size of eden | |
303 // and may not be attainable. "eden_size" below is | |
304 // calculated based on the location of from-space and | |
305 // the goal for the size of eden. from-space is | |
306 // fixed in place because it contains live data. | |
307 // The calculation is done this way to avoid 32bit | |
308 // overflow (i.e., eden_start + requested_eden_size | |
309 // may too large for representation in 32bits). | |
310 size_t eden_size; | |
311 if (maintain_minimum) { | |
312 // Only make eden larger than the requested size if | |
313 // the minimum size of the generation has to be maintained. | |
314 // This could be done in general but policy at a higher | |
315 // level is determining a requested size for eden and that | |
316 // should be honored unless there is a fundamental reason. | |
317 eden_size = pointer_delta(from_start, | |
318 eden_start, | |
319 sizeof(char)); | |
320 } else { | |
321 eden_size = MIN2(requested_eden_size, | |
322 pointer_delta(from_start, eden_start, sizeof(char))); | |
323 } | |
324 | |
325 // tty->print_cr("eden_size before: " SIZE_FORMAT, eden_size); | |
326 eden_size = align_size_down(eden_size, alignment); | |
327 // tty->print_cr("eden_size after: " SIZE_FORMAT, eden_size); | |
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, (char*)requested_survivor_size, | |
338 sizeof(char)); | |
339 | |
340 // Does the optimal to-space overlap from-space? | |
341 if (to_start < (char*)from()->end()) { | |
342 // Calculate the minimum offset possible for from_end | |
343 size_t from_size = pointer_delta(from()->top(), from_start, sizeof(char)); | |
344 | |
345 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
346 if (from_size == 0) { | |
347 from_size = alignment; | |
348 } else { | |
349 from_size = align_size_up(from_size, alignment); | |
350 } | |
351 | |
352 from_end = from_start + from_size; | |
353 assert(from_end > from_start, "addition overflow or from_size problem"); | |
354 | |
355 guarantee(from_end <= (char*)from()->end(), "from_end moved to the right"); | |
356 | |
357 // Now update to_start with the new from_end | |
358 to_start = MAX2(from_end, to_start); | |
359 } else { | |
360 // If shrinking, move to-space down to abut the end of from-space | |
361 // so that shrinking will move to-space down. If not shrinking | |
362 // to-space is moving up to allow for growth on the next expansion. | |
363 if (requested_eden_size <= cur_eden_size) { | |
364 to_start = from_end; | |
365 if (to_start + requested_survivor_size > to_start) { | |
366 to_end = to_start + requested_survivor_size; | |
367 } | |
368 } | |
369 // else leave to_end pointing to the high end of the virtual space. | |
370 } | |
371 | |
372 guarantee(to_start != to_end, "to space is zero sized"); | |
373 | |
374 if (PrintAdaptiveSizePolicy && Verbose) { | |
375 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
376 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
377 eden_start, | |
378 eden_end, | |
379 pointer_delta(eden_end, eden_start, sizeof(char))); | |
380 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
381 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
382 from_start, | |
383 from_end, | |
384 pointer_delta(from_end, from_start, sizeof(char))); | |
385 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
386 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
387 to_start, | |
388 to_end, | |
389 pointer_delta( to_end, to_start, sizeof(char))); | |
390 } | |
391 } else { | |
392 // Eden, to, from | |
393 if (PrintAdaptiveSizePolicy && Verbose) { | |
394 gclog_or_tty->print_cr(" Eden, to, from:"); | |
395 } | |
396 | |
397 // Calculate the to-space boundaries based on | |
398 // the start of from-space. | |
399 to_end = from_start; | |
400 to_start = (char*)pointer_delta(from_start, | |
401 (char*)requested_survivor_size, | |
402 sizeof(char)); | |
403 // Calculate the ideal eden boundaries. | |
404 // eden_end is already at the bottom of the generation | |
405 assert(eden_start == virtual_space()->low(), | |
406 "Eden is not starting at the low end of the virtual space"); | |
407 if (eden_start + requested_eden_size >= eden_start) { | |
408 eden_end = eden_start + requested_eden_size; | |
409 } else { | |
410 eden_end = to_start; | |
411 } | |
412 | |
413 // Does eden intrude into to-space? to-space | |
414 // gets priority but eden is not allowed to shrink | |
415 // to 0. | |
416 if (eden_end > to_start) { | |
417 eden_end = to_start; | |
418 } | |
419 | |
420 // Don't let eden shrink down to 0 or less. | |
421 eden_end = MAX2(eden_end, eden_start + alignment); | |
422 assert(eden_start + alignment >= eden_start, "Overflow"); | |
423 | |
424 size_t eden_size; | |
425 if (maintain_minimum) { | |
426 // Use all the space available. | |
427 eden_end = MAX2(eden_end, to_start); | |
428 eden_size = pointer_delta(eden_end, eden_start, sizeof(char)); | |
429 eden_size = MIN2(eden_size, cur_eden_size); | |
430 } else { | |
431 eden_size = pointer_delta(eden_end, eden_start, sizeof(char)); | |
432 } | |
433 eden_size = align_size_down(eden_size, alignment); | |
434 assert(maintain_minimum || eden_size <= requested_eden_size, | |
435 "Eden size is too large"); | |
436 assert(eden_size >= alignment, "Eden size is too small"); | |
437 eden_end = eden_start + eden_size; | |
438 | |
439 // Move to-space down to eden. | |
440 if (requested_eden_size < cur_eden_size) { | |
441 to_start = eden_end; | |
442 if (to_start + requested_survivor_size > to_start) { | |
443 to_end = MIN2(from_start, to_start + requested_survivor_size); | |
444 } else { | |
445 to_end = from_start; | |
446 } | |
447 } | |
448 | |
449 // eden_end may have moved so again make sure | |
450 // the to-space and eden don't overlap. | |
451 to_start = MAX2(eden_end, to_start); | |
452 | |
453 // from-space | |
454 size_t from_used = from()->used(); | |
455 if (requested_survivor_size > from_used) { | |
456 if (from_start + requested_survivor_size >= from_start) { | |
457 from_end = from_start + requested_survivor_size; | |
458 } | |
459 if (from_end > virtual_space()->high()) { | |
460 from_end = virtual_space()->high(); | |
461 } | |
462 } | |
463 | |
464 assert(to_start >= eden_end, "to-space should be above eden"); | |
465 if (PrintAdaptiveSizePolicy && Verbose) { | |
466 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
467 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
468 eden_start, | |
469 eden_end, | |
470 pointer_delta(eden_end, eden_start, sizeof(char))); | |
471 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
472 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
473 to_start, | |
474 to_end, | |
475 pointer_delta( to_end, to_start, sizeof(char))); | |
476 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
477 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
478 from_start, | |
479 from_end, | |
480 pointer_delta(from_end, from_start, sizeof(char))); | |
481 } | |
482 } | |
483 | |
484 | |
485 guarantee((HeapWord*)from_start <= from()->bottom(), | |
486 "from start moved to the right"); | |
487 guarantee((HeapWord*)from_end >= from()->top(), | |
488 "from end moved into live data"); | |
489 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
490 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
491 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
492 | |
493 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
494 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
495 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
496 | |
497 // Let's make sure the call to initialize doesn't reset "top"! | |
498 HeapWord* old_from_top = from()->top(); | |
499 | |
500 // For PrintAdaptiveSizePolicy block below | |
501 size_t old_from = from()->capacity(); | |
502 size_t old_to = to()->capacity(); | |
503 | |
504 // The call to initialize NULL's the next compaction space | |
505 eden()->initialize(edenMR, true); | |
506 eden()->set_next_compaction_space(from()); | |
507 to()->initialize(toMR , true); | |
508 from()->initialize(fromMR, false); // Note, not cleared! | |
509 | |
510 assert(from()->top() == old_from_top, "from top changed!"); | |
511 | |
512 if (PrintAdaptiveSizePolicy) { | |
513 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
514 assert(gch->kind() == CollectedHeap::GenCollectedHeap, "Sanity"); | |
515 | |
516 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
517 "collection: %d " | |
518 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
519 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
520 gch->total_collections(), | |
521 old_from, old_to, | |
522 from()->capacity(), | |
523 to()->capacity()); | |
524 gclog_or_tty->cr(); | |
525 } | |
526 } | |
527 | |
528 void ASParNewGeneration::compute_new_size() { | |
529 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
530 assert(gch->kind() == CollectedHeap::GenCollectedHeap, | |
531 "not a CMS generational heap"); | |
532 | |
533 | |
534 CMSAdaptiveSizePolicy* size_policy = | |
535 (CMSAdaptiveSizePolicy*)gch->gen_policy()->size_policy(); | |
536 assert(size_policy->is_gc_cms_adaptive_size_policy(), | |
537 "Wrong type of size policy"); | |
538 | |
539 size_t survived = from()->used(); | |
540 if (!survivor_overflow()) { | |
541 // Keep running averages on how much survived | |
542 size_policy->avg_survived()->sample(survived); | |
543 } else { | |
544 size_t promoted = | |
545 (size_t) next_gen()->gc_stats()->avg_promoted()->last_sample(); | |
546 assert(promoted < gch->capacity(), "Conversion problem?"); | |
547 size_t survived_guess = survived + promoted; | |
548 size_policy->avg_survived()->sample(survived_guess); | |
549 } | |
550 | |
551 size_t survivor_limit = max_survivor_size(); | |
552 _tenuring_threshold = | |
553 size_policy->compute_survivor_space_size_and_threshold( | |
554 _survivor_overflow, | |
555 _tenuring_threshold, | |
556 survivor_limit); | |
557 size_policy->avg_young_live()->sample(used()); | |
558 size_policy->avg_eden_live()->sample(eden()->used()); | |
559 | |
560 size_policy->compute_young_generation_free_space(eden()->capacity(), | |
561 max_gen_size()); | |
562 | |
563 resize(size_policy->calculated_eden_size_in_bytes(), | |
564 size_policy->calculated_survivor_size_in_bytes()); | |
565 | |
566 if (UsePerfData) { | |
567 CMSGCAdaptivePolicyCounters* counters = | |
568 (CMSGCAdaptivePolicyCounters*) gch->collector_policy()->counters(); | |
569 assert(counters->kind() == | |
570 GCPolicyCounters::CMSGCAdaptivePolicyCountersKind, | |
571 "Wrong kind of counters"); | |
572 counters->update_tenuring_threshold(_tenuring_threshold); | |
573 counters->update_survivor_overflowed(_survivor_overflow); | |
574 counters->update_young_capacity(capacity()); | |
575 } | |
576 } | |
577 | |
578 | |
579 #ifndef PRODUCT | |
580 // Changes from PSYoungGen version | |
581 // value of "alignment" | |
582 void ASParNewGeneration::space_invariants() { | |
583 const size_t alignment = os::vm_page_size(); | |
584 | |
585 // Currently, our eden size cannot shrink to zero | |
586 guarantee(eden()->capacity() >= alignment, "eden too small"); | |
587 guarantee(from()->capacity() >= alignment, "from too small"); | |
588 guarantee(to()->capacity() >= alignment, "to too small"); | |
589 | |
590 // Relationship of spaces to each other | |
591 char* eden_start = (char*)eden()->bottom(); | |
592 char* eden_end = (char*)eden()->end(); | |
593 char* from_start = (char*)from()->bottom(); | |
594 char* from_end = (char*)from()->end(); | |
595 char* to_start = (char*)to()->bottom(); | |
596 char* to_end = (char*)to()->end(); | |
597 | |
598 guarantee(eden_start >= virtual_space()->low(), "eden bottom"); | |
599 guarantee(eden_start < eden_end, "eden space consistency"); | |
600 guarantee(from_start < from_end, "from space consistency"); | |
601 guarantee(to_start < to_end, "to space consistency"); | |
602 | |
603 // Check whether from space is below to space | |
604 if (from_start < to_start) { | |
605 // Eden, from, to | |
606 guarantee(eden_end <= from_start, "eden/from boundary"); | |
607 guarantee(from_end <= to_start, "from/to boundary"); | |
608 guarantee(to_end <= virtual_space()->high(), "to end"); | |
609 } else { | |
610 // Eden, to, from | |
611 guarantee(eden_end <= to_start, "eden/to boundary"); | |
612 guarantee(to_end <= from_start, "to/from boundary"); | |
613 guarantee(from_end <= virtual_space()->high(), "from end"); | |
614 } | |
615 | |
616 // More checks that the virtual space is consistent with the spaces | |
617 assert(virtual_space()->committed_size() >= | |
618 (eden()->capacity() + | |
619 to()->capacity() + | |
620 from()->capacity()), "Committed size is inconsistent"); | |
621 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
622 "Space invariant"); | |
623 char* eden_top = (char*)eden()->top(); | |
624 char* from_top = (char*)from()->top(); | |
625 char* to_top = (char*)to()->top(); | |
626 assert(eden_top <= virtual_space()->high(), "eden top"); | |
627 assert(from_top <= virtual_space()->high(), "from top"); | |
628 assert(to_top <= virtual_space()->high(), "to top"); | |
629 } | |
630 #endif |