Mercurial > hg > graal-compiler
comparison src/share/vm/memory/collectorPolicy.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 2001-2007 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/_collectorPolicy.cpp.incl" | |
27 | |
28 // CollectorPolicy methods. | |
29 | |
30 void CollectorPolicy::initialize_flags() { | |
31 if (PermSize > MaxPermSize) { | |
32 MaxPermSize = PermSize; | |
33 } | |
34 PermSize = align_size_down(PermSize, min_alignment()); | |
35 MaxPermSize = align_size_up(MaxPermSize, max_alignment()); | |
36 | |
37 MinPermHeapExpansion = align_size_down(MinPermHeapExpansion, min_alignment()); | |
38 MaxPermHeapExpansion = align_size_down(MaxPermHeapExpansion, min_alignment()); | |
39 | |
40 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
41 | |
42 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment()); | |
43 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment()); | |
44 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment()); | |
45 | |
46 assert(PermSize % min_alignment() == 0, "permanent space alignment"); | |
47 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment"); | |
48 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment"); | |
49 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment"); | |
50 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment"); | |
51 if (PermSize < M) { | |
52 vm_exit_during_initialization("Too small initial permanent heap"); | |
53 } | |
54 } | |
55 | |
56 void CollectorPolicy::initialize_size_info() { | |
57 // User inputs from -mx and ms are aligned | |
58 _initial_heap_byte_size = align_size_up(Arguments::initial_heap_size(), | |
59 min_alignment()); | |
60 _min_heap_byte_size = align_size_up(Arguments::min_heap_size(), | |
61 min_alignment()); | |
62 _max_heap_byte_size = align_size_up(MaxHeapSize, max_alignment()); | |
63 | |
64 // Check validity of heap parameters from launcher | |
65 if (_initial_heap_byte_size == 0) { | |
66 _initial_heap_byte_size = NewSize + OldSize; | |
67 } else { | |
68 Universe::check_alignment(_initial_heap_byte_size, min_alignment(), | |
69 "initial heap"); | |
70 } | |
71 if (_min_heap_byte_size == 0) { | |
72 _min_heap_byte_size = NewSize + OldSize; | |
73 } else { | |
74 Universe::check_alignment(_min_heap_byte_size, min_alignment(), | |
75 "initial heap"); | |
76 } | |
77 | |
78 // Check heap parameter properties | |
79 if (_initial_heap_byte_size < M) { | |
80 vm_exit_during_initialization("Too small initial heap"); | |
81 } | |
82 // Check heap parameter properties | |
83 if (_min_heap_byte_size < M) { | |
84 vm_exit_during_initialization("Too small minimum heap"); | |
85 } | |
86 if (_initial_heap_byte_size <= NewSize) { | |
87 // make sure there is at least some room in old space | |
88 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
89 } | |
90 if (_max_heap_byte_size < _min_heap_byte_size) { | |
91 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); | |
92 } | |
93 if (_initial_heap_byte_size < _min_heap_byte_size) { | |
94 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); | |
95 } | |
96 if (_max_heap_byte_size < _initial_heap_byte_size) { | |
97 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); | |
98 } | |
99 } | |
100 | |
101 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
102 _permanent_generation = | |
103 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
104 SharedReadOnlySize, | |
105 SharedReadWriteSize, | |
106 SharedMiscDataSize, | |
107 SharedMiscCodeSize); | |
108 if (_permanent_generation == NULL) { | |
109 vm_exit_during_initialization("Unable to allocate gen spec"); | |
110 } | |
111 } | |
112 | |
113 | |
114 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
115 int max_covered_regions) { | |
116 switch (rem_set_name()) { | |
117 case GenRemSet::CardTable: { | |
118 if (barrier_set_name() != BarrierSet::CardTableModRef) | |
119 vm_exit_during_initialization("Mismatch between RS and BS."); | |
120 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
121 return res; | |
122 } | |
123 default: | |
124 guarantee(false, "unrecognized GenRemSet::Name"); | |
125 return NULL; | |
126 } | |
127 } | |
128 | |
129 // GenCollectorPolicy methods. | |
130 | |
131 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, | |
132 size_t init_promo_size, | |
133 size_t init_survivor_size) { | |
134 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
135 _size_policy = new AdaptiveSizePolicy(init_eden_size, | |
136 init_promo_size, | |
137 init_survivor_size, | |
138 max_gc_minor_pause_sec, | |
139 GCTimeRatio); | |
140 } | |
141 | |
142 size_t GenCollectorPolicy::compute_max_alignment() { | |
143 // The card marking array and the offset arrays for old generations are | |
144 // committed in os pages as well. Make sure they are entirely full (to | |
145 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
146 // byte entry and the os page size is 4096, the maximum heap size should | |
147 // be 512*4096 = 2MB aligned. | |
148 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
149 | |
150 // Parallel GC does its own alignment of the generations to avoid requiring a | |
151 // large page (256M on some platforms) for the permanent generation. The | |
152 // other collectors should also be updated to do their own alignment and then | |
153 // this use of lcm() should be removed. | |
154 if (UseLargePages && !UseParallelGC) { | |
155 // in presence of large pages we have to make sure that our | |
156 // alignment is large page aware | |
157 alignment = lcm(os::large_page_size(), alignment); | |
158 } | |
159 | |
160 return alignment; | |
161 } | |
162 | |
163 void GenCollectorPolicy::initialize_flags() { | |
164 // All sizes must be multiples of the generation granularity. | |
165 set_min_alignment((uintx) Generation::GenGrain); | |
166 set_max_alignment(compute_max_alignment()); | |
167 assert(max_alignment() >= min_alignment() && | |
168 max_alignment() % min_alignment() == 0, | |
169 "invalid alignment constraints"); | |
170 | |
171 CollectorPolicy::initialize_flags(); | |
172 | |
173 // All generational heaps have a youngest gen; handle those flags here. | |
174 | |
175 // Adjust max size parameters | |
176 if (NewSize > MaxNewSize) { | |
177 MaxNewSize = NewSize; | |
178 } | |
179 NewSize = align_size_down(NewSize, min_alignment()); | |
180 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
181 | |
182 // Check validity of heap flags | |
183 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
184 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
185 | |
186 if (NewSize < 3*min_alignment()) { | |
187 // make sure there room for eden and two survivor spaces | |
188 vm_exit_during_initialization("Too small new size specified"); | |
189 } | |
190 if (SurvivorRatio < 1 || NewRatio < 1) { | |
191 vm_exit_during_initialization("Invalid heap ratio specified"); | |
192 } | |
193 } | |
194 | |
195 void TwoGenerationCollectorPolicy::initialize_flags() { | |
196 GenCollectorPolicy::initialize_flags(); | |
197 | |
198 OldSize = align_size_down(OldSize, min_alignment()); | |
199 if (NewSize + OldSize > MaxHeapSize) { | |
200 MaxHeapSize = NewSize + OldSize; | |
201 } | |
202 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
203 | |
204 always_do_update_barrier = UseConcMarkSweepGC; | |
205 BlockOffsetArrayUseUnallocatedBlock = | |
206 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
207 | |
208 // Check validity of heap flags | |
209 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
210 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
211 } | |
212 | |
213 void GenCollectorPolicy::initialize_size_info() { | |
214 CollectorPolicy::initialize_size_info(); | |
215 | |
216 // Minimum sizes of the generations may be different than | |
217 // the initial sizes. | |
218 if (!FLAG_IS_DEFAULT(NewSize)) { | |
219 _min_gen0_size = NewSize; | |
220 } else { | |
221 _min_gen0_size = align_size_down(_min_heap_byte_size / (NewRatio+1), | |
222 min_alignment()); | |
223 // We bound the minimum size by NewSize below (since it historically | |
224 // would have been NewSize and because the NewRatio calculation could | |
225 // yield a size that is too small) and bound it by MaxNewSize above. | |
226 // This is not always best. The NewSize calculated by CMS (which has | |
227 // a fixed minimum of 16m) can sometimes be "too" large. Consider | |
228 // the case where -Xmx32m. The CMS calculated NewSize would be about | |
229 // half the entire heap which seems too large. But the counter | |
230 // example is seen when the client defaults for NewRatio are used. | |
231 // An initial young generation size of 640k was observed | |
232 // with -Xmx128m -XX:MaxNewSize=32m when NewSize was not used | |
233 // as a lower bound as with | |
234 // _min_gen0_size = MIN2(_min_gen0_size, MaxNewSize); | |
235 // and 640k seemed too small a young generation. | |
236 _min_gen0_size = MIN2(MAX2(_min_gen0_size, NewSize), MaxNewSize); | |
237 } | |
238 | |
239 // Parameters are valid, compute area sizes. | |
240 size_t max_new_size = align_size_down(_max_heap_byte_size / (NewRatio+1), | |
241 min_alignment()); | |
242 max_new_size = MIN2(MAX2(max_new_size, _min_gen0_size), MaxNewSize); | |
243 | |
244 // desired_new_size is used to set the initial size. The | |
245 // initial size must be greater than the minimum size. | |
246 size_t desired_new_size = | |
247 align_size_down(_initial_heap_byte_size / (NewRatio+1), | |
248 min_alignment()); | |
249 | |
250 size_t new_size = MIN2(MAX2(desired_new_size, _min_gen0_size), max_new_size); | |
251 | |
252 _initial_gen0_size = new_size; | |
253 _max_gen0_size = max_new_size; | |
254 } | |
255 | |
256 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
257 GenCollectorPolicy::initialize_size_info(); | |
258 | |
259 // Minimum sizes of the generations may be different than | |
260 // the initial sizes. An inconsistently is permitted here | |
261 // in the total size that can be specified explicitly by | |
262 // command line specification of OldSize and NewSize and | |
263 // also a command line specification of -Xms. Issue a warning | |
264 // but allow the values to pass. | |
265 if (!FLAG_IS_DEFAULT(OldSize)) { | |
266 _min_gen1_size = OldSize; | |
267 // The generation minimums and the overall heap mimimum should | |
268 // be within one heap alignment. | |
269 if ((_min_gen1_size + _min_gen0_size + max_alignment()) < | |
270 _min_heap_byte_size) { | |
271 warning("Inconsistency between minimum heap size and minimum " | |
272 "generation sizes: using min heap = " SIZE_FORMAT, | |
273 _min_heap_byte_size); | |
274 } | |
275 } else { | |
276 _min_gen1_size = _min_heap_byte_size - _min_gen0_size; | |
277 } | |
278 | |
279 _initial_gen1_size = _initial_heap_byte_size - _initial_gen0_size; | |
280 _max_gen1_size = _max_heap_byte_size - _max_gen0_size; | |
281 } | |
282 | |
283 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
284 bool is_tlab, | |
285 bool* gc_overhead_limit_was_exceeded) { | |
286 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
287 | |
288 debug_only(gch->check_for_valid_allocation_state()); | |
289 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
290 HeapWord* result = NULL; | |
291 | |
292 // Loop until the allocation is satisified, | |
293 // or unsatisfied after GC. | |
294 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
295 HandleMark hm; // discard any handles allocated in each iteration | |
296 | |
297 // First allocation attempt is lock-free. | |
298 Generation *gen0 = gch->get_gen(0); | |
299 assert(gen0->supports_inline_contig_alloc(), | |
300 "Otherwise, must do alloc within heap lock"); | |
301 if (gen0->should_allocate(size, is_tlab)) { | |
302 result = gen0->par_allocate(size, is_tlab); | |
303 if (result != NULL) { | |
304 assert(gch->is_in_reserved(result), "result not in heap"); | |
305 return result; | |
306 } | |
307 } | |
308 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
309 { | |
310 MutexLocker ml(Heap_lock); | |
311 if (PrintGC && Verbose) { | |
312 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
313 " attempting locked slow path allocation"); | |
314 } | |
315 // Note that only large objects get a shot at being | |
316 // allocated in later generations. | |
317 bool first_only = ! should_try_older_generation_allocation(size); | |
318 | |
319 result = gch->attempt_allocation(size, is_tlab, first_only); | |
320 if (result != NULL) { | |
321 assert(gch->is_in_reserved(result), "result not in heap"); | |
322 return result; | |
323 } | |
324 | |
325 // There are NULL's returned for different circumstances below. | |
326 // In general gc_overhead_limit_was_exceeded should be false so | |
327 // set it so here and reset it to true only if the gc time | |
328 // limit is being exceeded as checked below. | |
329 *gc_overhead_limit_was_exceeded = false; | |
330 | |
331 if (GC_locker::is_active_and_needs_gc()) { | |
332 if (is_tlab) { | |
333 return NULL; // Caller will retry allocating individual object | |
334 } | |
335 if (!gch->is_maximal_no_gc()) { | |
336 // Try and expand heap to satisfy request | |
337 result = expand_heap_and_allocate(size, is_tlab); | |
338 // result could be null if we are out of space | |
339 if (result != NULL) { | |
340 return result; | |
341 } | |
342 } | |
343 | |
344 // If this thread is not in a jni critical section, we stall | |
345 // the requestor until the critical section has cleared and | |
346 // GC allowed. When the critical section clears, a GC is | |
347 // initiated by the last thread exiting the critical section; so | |
348 // we retry the allocation sequence from the beginning of the loop, | |
349 // rather than causing more, now probably unnecessary, GC attempts. | |
350 JavaThread* jthr = JavaThread::current(); | |
351 if (!jthr->in_critical()) { | |
352 MutexUnlocker mul(Heap_lock); | |
353 // Wait for JNI critical section to be exited | |
354 GC_locker::stall_until_clear(); | |
355 continue; | |
356 } else { | |
357 if (CheckJNICalls) { | |
358 fatal("Possible deadlock due to allocating while" | |
359 " in jni critical section"); | |
360 } | |
361 return NULL; | |
362 } | |
363 } | |
364 | |
365 // Read the gc count while the heap lock is held. | |
366 gc_count_before = Universe::heap()->total_collections(); | |
367 } | |
368 | |
369 // Allocation has failed and a collection is about | |
370 // to be done. If the gc time limit was exceeded the | |
371 // last time a collection was done, return NULL so | |
372 // that an out-of-memory will be thrown. Clear | |
373 // gc_time_limit_exceeded so that subsequent attempts | |
374 // at a collection will be made. | |
375 if (size_policy()->gc_time_limit_exceeded()) { | |
376 *gc_overhead_limit_was_exceeded = true; | |
377 size_policy()->set_gc_time_limit_exceeded(false); | |
378 return NULL; | |
379 } | |
380 | |
381 VM_GenCollectForAllocation op(size, | |
382 is_tlab, | |
383 gc_count_before); | |
384 VMThread::execute(&op); | |
385 if (op.prologue_succeeded()) { | |
386 result = op.result(); | |
387 if (op.gc_locked()) { | |
388 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
389 continue; // retry and/or stall as necessary | |
390 } | |
391 assert(result == NULL || gch->is_in_reserved(result), | |
392 "result not in heap"); | |
393 return result; | |
394 } | |
395 | |
396 // Give a warning if we seem to be looping forever. | |
397 if ((QueuedAllocationWarningCount > 0) && | |
398 (try_count % QueuedAllocationWarningCount == 0)) { | |
399 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
400 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
401 } | |
402 } | |
403 } | |
404 | |
405 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
406 bool is_tlab) { | |
407 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
408 HeapWord* result = NULL; | |
409 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
410 Generation *gen = gch->get_gen(i); | |
411 if (gen->should_allocate(size, is_tlab)) { | |
412 result = gen->expand_and_allocate(size, is_tlab); | |
413 } | |
414 } | |
415 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
416 return result; | |
417 } | |
418 | |
419 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
420 bool is_tlab) { | |
421 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
422 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
423 HeapWord* result = NULL; | |
424 | |
425 assert(size != 0, "Precondition violated"); | |
426 if (GC_locker::is_active_and_needs_gc()) { | |
427 // GC locker is active; instead of a collection we will attempt | |
428 // to expand the heap, if there's room for expansion. | |
429 if (!gch->is_maximal_no_gc()) { | |
430 result = expand_heap_and_allocate(size, is_tlab); | |
431 } | |
432 return result; // could be null if we are out of space | |
433 } else if (!gch->incremental_collection_will_fail()) { | |
434 // The gc_prologues have not executed yet. The value | |
435 // for incremental_collection_will_fail() is the remanent | |
436 // of the last collection. | |
437 // Do an incremental collection. | |
438 gch->do_collection(false /* full */, | |
439 false /* clear_all_soft_refs */, | |
440 size /* size */, | |
441 is_tlab /* is_tlab */, | |
442 number_of_generations() - 1 /* max_level */); | |
443 } else { | |
444 // Try a full collection; see delta for bug id 6266275 | |
445 // for the original code and why this has been simplified | |
446 // with from-space allocation criteria modified and | |
447 // such allocation moved out of the safepoint path. | |
448 gch->do_collection(true /* full */, | |
449 false /* clear_all_soft_refs */, | |
450 size /* size */, | |
451 is_tlab /* is_tlab */, | |
452 number_of_generations() - 1 /* max_level */); | |
453 } | |
454 | |
455 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
456 | |
457 if (result != NULL) { | |
458 assert(gch->is_in_reserved(result), "result not in heap"); | |
459 return result; | |
460 } | |
461 | |
462 // OK, collection failed, try expansion. | |
463 result = expand_heap_and_allocate(size, is_tlab); | |
464 if (result != NULL) { | |
465 return result; | |
466 } | |
467 | |
468 // If we reach this point, we're really out of memory. Try every trick | |
469 // we can to reclaim memory. Force collection of soft references. Force | |
470 // a complete compaction of the heap. Any additional methods for finding | |
471 // free memory should be here, especially if they are expensive. If this | |
472 // attempt fails, an OOM exception will be thrown. | |
473 { | |
474 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
475 | |
476 gch->do_collection(true /* full */, | |
477 true /* clear_all_soft_refs */, | |
478 size /* size */, | |
479 is_tlab /* is_tlab */, | |
480 number_of_generations() - 1 /* max_level */); | |
481 } | |
482 | |
483 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
484 if (result != NULL) { | |
485 assert(gch->is_in_reserved(result), "result not in heap"); | |
486 return result; | |
487 } | |
488 | |
489 // What else? We might try synchronous finalization later. If the total | |
490 // space available is large enough for the allocation, then a more | |
491 // complete compaction phase than we've tried so far might be | |
492 // appropriate. | |
493 return NULL; | |
494 } | |
495 | |
496 size_t GenCollectorPolicy::large_typearray_limit() { | |
497 return FastAllocateSizeLimit; | |
498 } | |
499 | |
500 // Return true if any of the following is true: | |
501 // . the allocation won't fit into the current young gen heap | |
502 // . gc locker is occupied (jni critical section) | |
503 // . heap memory is tight -- the most recent previous collection | |
504 // was a full collection because a partial collection (would | |
505 // have) failed and is likely to fail again | |
506 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
507 size_t word_size) const { | |
508 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
509 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
510 return (word_size > heap_word_size(gen0_capacity)) | |
511 || (GC_locker::is_active_and_needs_gc()) | |
512 || ( gch->last_incremental_collection_failed() | |
513 && gch->incremental_collection_will_fail()); | |
514 } | |
515 | |
516 | |
517 // | |
518 // MarkSweepPolicy methods | |
519 // | |
520 | |
521 MarkSweepPolicy::MarkSweepPolicy() { | |
522 initialize_all(); | |
523 } | |
524 | |
525 void MarkSweepPolicy::initialize_generations() { | |
526 initialize_perm_generation(PermGen::MarkSweepCompact); | |
527 _generations = new GenerationSpecPtr[number_of_generations()]; | |
528 if (_generations == NULL) | |
529 vm_exit_during_initialization("Unable to allocate gen spec"); | |
530 | |
531 if (UseParNewGC && ParallelGCThreads > 0) { | |
532 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
533 } else { | |
534 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
535 } | |
536 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
537 | |
538 if (_generations[0] == NULL || _generations[1] == NULL) | |
539 vm_exit_during_initialization("Unable to allocate gen spec"); | |
540 } | |
541 | |
542 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
543 // initialize the policy counters - 2 collectors, 3 generations | |
544 if (UseParNewGC && ParallelGCThreads > 0) { | |
545 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
546 } | |
547 else { | |
548 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
549 } | |
550 } |