1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc_implementation/shared/adaptiveSizePolicy.hpp"
27 #include "gc_implementation/shared/gcPolicyCounters.hpp"
28 #include "gc_implementation/shared/vmGCOperations.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/collectorPolicy.hpp"
31 #include "memory/gcLocker.inline.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/generationSpec.hpp"
34 #include "memory/space.hpp"
35 #include "memory/universe.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/handles.inline.hpp"
39 #include "runtime/java.hpp"
40 #include "runtime/thread.inline.hpp"
41 #include "runtime/vmThread.hpp"
42 #include "utilities/macros.hpp"
43
44 // CollectorPolicy methods
45
46 CollectorPolicy::CollectorPolicy() :
47 _space_alignment(0),
48 _heap_alignment(0),
49 _initial_heap_byte_size(InitialHeapSize),
50 _max_heap_byte_size(MaxHeapSize),
51 _min_heap_byte_size(Arguments::min_heap_size()),
52 _max_heap_size_cmdline(false),
53 _size_policy(NULL),
54 _should_clear_all_soft_refs(false),
55 _all_soft_refs_clear(false)
56 {}
57
58 #ifdef ASSERT
59 void CollectorPolicy::assert_flags() {
60 assert(InitialHeapSize <= MaxHeapSize, "Ergonomics decided on incompatible initial and maximum heap sizes");
61 assert(InitialHeapSize % _heap_alignment == 0, "InitialHeapSize alignment");
62 assert(MaxHeapSize % _heap_alignment == 0, "MaxHeapSize alignment");
63 }
64
65 void CollectorPolicy::assert_size_info() {
66 assert(InitialHeapSize == _initial_heap_byte_size, "Discrepancy between InitialHeapSize flag and local storage");
67 assert(MaxHeapSize == _max_heap_byte_size, "Discrepancy between MaxHeapSize flag and local storage");
68 assert(_max_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible minimum and maximum heap sizes");
69 assert(_initial_heap_byte_size >= _min_heap_byte_size, "Ergonomics decided on incompatible initial and minimum heap sizes");
70 assert(_max_heap_byte_size >= _initial_heap_byte_size, "Ergonomics decided on incompatible initial and maximum heap sizes");
71 assert(_min_heap_byte_size % _heap_alignment == 0, "min_heap_byte_size alignment");
72 assert(_initial_heap_byte_size % _heap_alignment == 0, "initial_heap_byte_size alignment");
73 assert(_max_heap_byte_size % _heap_alignment == 0, "max_heap_byte_size alignment");
74 }
75 #endif // ASSERT
76
77 void CollectorPolicy::initialize_flags() {
78 assert(_space_alignment != 0, "Space alignment not set up properly");
79 assert(_heap_alignment != 0, "Heap alignment not set up properly");
80 assert(_heap_alignment >= _space_alignment,
81 err_msg("heap_alignment: " SIZE_FORMAT " less than space_alignment: " SIZE_FORMAT,
82 _heap_alignment, _space_alignment));
83 assert(_heap_alignment % _space_alignment == 0,
84 err_msg("heap_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT,
85 _heap_alignment, _space_alignment));
86
87 if (FLAG_IS_CMDLINE(MaxHeapSize)) {
88 if (FLAG_IS_CMDLINE(InitialHeapSize) && InitialHeapSize > MaxHeapSize) {
89 vm_exit_during_initialization("Initial heap size set to a larger value than the maximum heap size");
90 }
91 if (_min_heap_byte_size != 0 && MaxHeapSize < _min_heap_byte_size) {
92 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified");
93 }
94 _max_heap_size_cmdline = true;
95 }
96
97 // Check heap parameter properties
98 if (InitialHeapSize < M) {
99 vm_exit_during_initialization("Too small initial heap");
100 }
101 if (_min_heap_byte_size < M) {
102 vm_exit_during_initialization("Too small minimum heap");
103 }
104
105 // User inputs from -Xmx and -Xms must be aligned
106 _min_heap_byte_size = align_size_up(_min_heap_byte_size, _heap_alignment);
107 size_t aligned_initial_heap_size = align_size_up(InitialHeapSize, _heap_alignment);
108 size_t aligned_max_heap_size = align_size_up(MaxHeapSize, _heap_alignment);
109
110 // Write back to flags if the values changed
111 if (aligned_initial_heap_size != InitialHeapSize) {
112 FLAG_SET_ERGO(size_t, InitialHeapSize, aligned_initial_heap_size);
113 }
114 if (aligned_max_heap_size != MaxHeapSize) {
115 FLAG_SET_ERGO(size_t, MaxHeapSize, aligned_max_heap_size);
116 }
117
118 if (FLAG_IS_CMDLINE(InitialHeapSize) && _min_heap_byte_size != 0 &&
119 InitialHeapSize < _min_heap_byte_size) {
120 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified");
121 }
122 if (!FLAG_IS_DEFAULT(InitialHeapSize) && InitialHeapSize > MaxHeapSize) {
123 FLAG_SET_ERGO(size_t, MaxHeapSize, InitialHeapSize);
124 } else if (!FLAG_IS_DEFAULT(MaxHeapSize) && InitialHeapSize > MaxHeapSize) {
125 FLAG_SET_ERGO(size_t, InitialHeapSize, MaxHeapSize);
126 if (InitialHeapSize < _min_heap_byte_size) {
127 _min_heap_byte_size = InitialHeapSize;
128 }
129 }
130
131 _initial_heap_byte_size = InitialHeapSize;
132 _max_heap_byte_size = MaxHeapSize;
133
134 FLAG_SET_ERGO(size_t, MinHeapDeltaBytes, align_size_up(MinHeapDeltaBytes, _space_alignment));
135
136 DEBUG_ONLY(CollectorPolicy::assert_flags();)
137 }
138
139 void CollectorPolicy::initialize_size_info() {
140 if (PrintGCDetails && Verbose) {
141 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap "
142 SIZE_FORMAT " Maximum heap " SIZE_FORMAT,
143 _min_heap_byte_size, _initial_heap_byte_size, _max_heap_byte_size);
144 }
145
146 DEBUG_ONLY(CollectorPolicy::assert_size_info();)
147 }
148
149 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) {
150 bool result = _should_clear_all_soft_refs;
151 set_should_clear_all_soft_refs(false);
152 return result;
153 }
154
155 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap) {
156 return new CardTableRS(whole_heap);
157 }
158
159 void CollectorPolicy::cleared_all_soft_refs() {
160 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may
161 // have been cleared in the last collection but if the gc overhear
162 // limit continues to be near, SoftRefs should still be cleared.
163 if (size_policy() != NULL) {
164 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near();
165 }
166 _all_soft_refs_clear = true;
167 }
168
169 size_t CollectorPolicy::compute_heap_alignment() {
170 // The card marking array and the offset arrays for old generations are
171 // committed in os pages as well. Make sure they are entirely full (to
172 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1
173 // byte entry and the os page size is 4096, the maximum heap size should
174 // be 512*4096 = 2MB aligned.
175
176 size_t alignment = GenRemSet::max_alignment_constraint();
177
178 if (UseLargePages) {
179 // In presence of large pages we have to make sure that our
180 // alignment is large page aware.
181 alignment = lcm(os::large_page_size(), alignment);
182 }
183
184 return alignment;
185 }
186
187 // GenCollectorPolicy methods
188
189 GenCollectorPolicy::GenCollectorPolicy() :
190 _min_young_size(0),
191 _initial_young_size(0),
192 _max_young_size(0),
193 _gen_alignment(0),
194 _min_old_size(0),
195 _initial_old_size(0),
196 _max_old_size(0),
197 _generations(NULL)
198 {}
199
200 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) {
201 return align_size_down_bounded(base_size / (NewRatio + 1), _gen_alignment);
202 }
203
204 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size,
205 size_t maximum_size) {
206 size_t max_minus = maximum_size - _gen_alignment;
207 return desired_size < max_minus ? desired_size : max_minus;
208 }
209
210
211 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size,
212 size_t init_promo_size,
213 size_t init_survivor_size) {
214 const double max_gc_pause_sec = ((double) MaxGCPauseMillis) / 1000.0;
215 _size_policy = new AdaptiveSizePolicy(init_eden_size,
216 init_promo_size,
217 init_survivor_size,
218 max_gc_pause_sec,
219 GCTimeRatio);
220 }
221
222 size_t GenCollectorPolicy::young_gen_size_lower_bound() {
223 // The young generation must be aligned and have room for eden + two survivors
224 return align_size_up(3 * _space_alignment, _gen_alignment);
225 }
226
227 #ifdef ASSERT
228 void GenCollectorPolicy::assert_flags() {
229 CollectorPolicy::assert_flags();
230 assert(NewSize >= _min_young_size, "Ergonomics decided on a too small young gen size");
231 assert(NewSize <= MaxNewSize, "Ergonomics decided on incompatible initial and maximum young gen sizes");
232 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young gen and heap sizes");
233 assert(NewSize % _gen_alignment == 0, "NewSize alignment");
234 assert(FLAG_IS_DEFAULT(MaxNewSize) || MaxNewSize % _gen_alignment == 0, "MaxNewSize alignment");
235 assert(OldSize + NewSize <= MaxHeapSize, "Ergonomics decided on incompatible generation and heap sizes");
236 assert(OldSize % _gen_alignment == 0, "OldSize alignment");
237 }
238
239 void GenCollectorPolicy::assert_size_info() {
240 CollectorPolicy::assert_size_info();
241 // GenCollectorPolicy::initialize_size_info may update the MaxNewSize
242 assert(MaxNewSize < MaxHeapSize, "Ergonomics decided on incompatible maximum young and heap sizes");
243 assert(NewSize == _initial_young_size, "Discrepancy between NewSize flag and local storage");
244 assert(MaxNewSize == _max_young_size, "Discrepancy between MaxNewSize flag and local storage");
245 assert(OldSize == _initial_old_size, "Discrepancy between OldSize flag and local storage");
246 assert(_min_young_size <= _initial_young_size, "Ergonomics decided on incompatible minimum and initial young gen sizes");
247 assert(_initial_young_size <= _max_young_size, "Ergonomics decided on incompatible initial and maximum young gen sizes");
248 assert(_min_young_size % _gen_alignment == 0, "_min_young_size alignment");
249 assert(_initial_young_size % _gen_alignment == 0, "_initial_young_size alignment");
250 assert(_max_young_size % _gen_alignment == 0, "_max_young_size alignment");
251 assert(_min_young_size <= bound_minus_alignment(_min_young_size, _min_heap_byte_size),
252 "Ergonomics made minimum young generation larger than minimum heap");
253 assert(_initial_young_size <= bound_minus_alignment(_initial_young_size, _initial_heap_byte_size),
254 "Ergonomics made initial young generation larger than initial heap");
255 assert(_max_young_size <= bound_minus_alignment(_max_young_size, _max_heap_byte_size),
256 "Ergonomics made maximum young generation lager than maximum heap");
257 assert(_min_old_size <= _initial_old_size, "Ergonomics decided on incompatible minimum and initial old gen sizes");
258 assert(_initial_old_size <= _max_old_size, "Ergonomics decided on incompatible initial and maximum old gen sizes");
259 assert(_max_old_size % _gen_alignment == 0, "_max_old_size alignment");
260 assert(_initial_old_size % _gen_alignment == 0, "_initial_old_size alignment");
261 assert(_max_heap_byte_size <= (_max_young_size + _max_old_size), "Total maximum heap sizes must be sum of generation maximum sizes");
262 assert(_min_young_size + _min_old_size <= _min_heap_byte_size, "Minimum generation sizes exceed minimum heap size");
263 assert(_initial_young_size + _initial_old_size == _initial_heap_byte_size, "Initial generation sizes should match initial heap size");
264 assert(_max_young_size + _max_old_size == _max_heap_byte_size, "Maximum generation sizes should match maximum heap size");
265 }
266 #endif // ASSERT
267
268 void GenCollectorPolicy::initialize_flags() {
269 CollectorPolicy::initialize_flags();
270
271 assert(_gen_alignment != 0, "Generation alignment not set up properly");
272 assert(_heap_alignment >= _gen_alignment,
273 err_msg("heap_alignment: " SIZE_FORMAT " less than gen_alignment: " SIZE_FORMAT,
274 _heap_alignment, _gen_alignment));
275 assert(_gen_alignment % _space_alignment == 0,
276 err_msg("gen_alignment: " SIZE_FORMAT " not aligned by space_alignment: " SIZE_FORMAT,
277 _gen_alignment, _space_alignment));
278 assert(_heap_alignment % _gen_alignment == 0,
279 err_msg("heap_alignment: " SIZE_FORMAT " not aligned by gen_alignment: " SIZE_FORMAT,
280 _heap_alignment, _gen_alignment));
281
282 // All generational heaps have a youngest gen; handle those flags here
283
284 // Make sure the heap is large enough for two generations
285 size_t smallest_new_size = young_gen_size_lower_bound();
286 size_t smallest_heap_size = align_size_up(smallest_new_size + align_size_up(_space_alignment, _gen_alignment),
287 _heap_alignment);
288 if (MaxHeapSize < smallest_heap_size) {
289 FLAG_SET_ERGO(size_t, MaxHeapSize, smallest_heap_size);
290 _max_heap_byte_size = MaxHeapSize;
291 }
292 // If needed, synchronize _min_heap_byte size and _initial_heap_byte_size
293 if (_min_heap_byte_size < smallest_heap_size) {
294 _min_heap_byte_size = smallest_heap_size;
295 if (InitialHeapSize < _min_heap_byte_size) {
296 FLAG_SET_ERGO(size_t, InitialHeapSize, smallest_heap_size);
297 _initial_heap_byte_size = smallest_heap_size;
298 }
299 }
300
301 // Make sure NewSize allows an old generation to fit even if set on the command line
302 if (FLAG_IS_CMDLINE(NewSize) && NewSize >= _initial_heap_byte_size) {
303 warning("NewSize was set larger than initial heap size, will use initial heap size.");
304 NewSize = bound_minus_alignment(NewSize, _initial_heap_byte_size);
305 }
306
307 // Now take the actual NewSize into account. We will silently increase NewSize
308 // if the user specified a smaller or unaligned value.
309 size_t bounded_new_size = bound_minus_alignment(NewSize, MaxHeapSize);
310 bounded_new_size = MAX2(smallest_new_size, (size_t)align_size_down(bounded_new_size, _gen_alignment));
311 if (bounded_new_size != NewSize) {
312 // Do not use FLAG_SET_ERGO to update NewSize here, since this will override
313 // if NewSize was set on the command line or not. This information is needed
314 // later when setting the initial and minimum young generation size.
315 NewSize = bounded_new_size;
316 }
317 _min_young_size = smallest_new_size;
318 _initial_young_size = NewSize;
319
320 if (!FLAG_IS_DEFAULT(MaxNewSize)) {
321 if (MaxNewSize >= MaxHeapSize) {
322 // Make sure there is room for an old generation
323 size_t smaller_max_new_size = MaxHeapSize - _gen_alignment;
324 if (FLAG_IS_CMDLINE(MaxNewSize)) {
325 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or greater than the entire "
326 "heap (" SIZE_FORMAT "k). A new max generation size of " SIZE_FORMAT "k will be used.",
327 MaxNewSize/K, MaxHeapSize/K, smaller_max_new_size/K);
328 }
329 FLAG_SET_ERGO(size_t, MaxNewSize, smaller_max_new_size);
330 if (NewSize > MaxNewSize) {
331 FLAG_SET_ERGO(size_t, NewSize, MaxNewSize);
332 _initial_young_size = NewSize;
333 }
334 } else if (MaxNewSize < _initial_young_size) {
335 FLAG_SET_ERGO(size_t, MaxNewSize, _initial_young_size);
336 } else if (!is_size_aligned(MaxNewSize, _gen_alignment)) {
337 FLAG_SET_ERGO(size_t, MaxNewSize, align_size_down(MaxNewSize, _gen_alignment));
338 }
339 _max_young_size = MaxNewSize;
340 }
341
342 if (NewSize > MaxNewSize) {
343 // At this point this should only happen if the user specifies a large NewSize and/or
344 // a small (but not too small) MaxNewSize.
345 if (FLAG_IS_CMDLINE(MaxNewSize)) {
346 warning("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). "
347 "A new max generation size of " SIZE_FORMAT "k will be used.",
348 NewSize/K, MaxNewSize/K, NewSize/K);
349 }
350 FLAG_SET_ERGO(size_t, MaxNewSize, NewSize);
351 _max_young_size = MaxNewSize;
352 }
353
354 if (SurvivorRatio < 1 || NewRatio < 1) {
355 vm_exit_during_initialization("Invalid young gen ratio specified");
356 }
357
358 if (!is_size_aligned(OldSize, _gen_alignment)) {
359 // Setting OldSize directly to preserve information about the possible
360 // setting of OldSize on the command line.
361 OldSize = align_size_down(OldSize, _gen_alignment);
362 }
363
364 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(MaxHeapSize)) {
365 // NewRatio will be used later to set the young generation size so we use
366 // it to calculate how big the heap should be based on the requested OldSize
367 // and NewRatio.
368 assert(NewRatio > 0, "NewRatio should have been set up earlier");
369 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1);
370
371 calculated_heapsize = align_size_up(calculated_heapsize, _heap_alignment);
372 FLAG_SET_ERGO(size_t, MaxHeapSize, calculated_heapsize);
373 _max_heap_byte_size = MaxHeapSize;
374 FLAG_SET_ERGO(size_t, InitialHeapSize, calculated_heapsize);
375 _initial_heap_byte_size = InitialHeapSize;
376 }
377
378 // Adjust NewSize and OldSize or MaxHeapSize to match each other
379 if (NewSize + OldSize > MaxHeapSize) {
380 if (_max_heap_size_cmdline) {
381 // Somebody has set a maximum heap size with the intention that we should not
382 // exceed it. Adjust New/OldSize as necessary.
383 size_t calculated_size = NewSize + OldSize;
384 double shrink_factor = (double) MaxHeapSize / calculated_size;
385 size_t smaller_new_size = align_size_down((size_t)(NewSize * shrink_factor), _gen_alignment);
386 FLAG_SET_ERGO(size_t, NewSize, MAX2(young_gen_size_lower_bound(), smaller_new_size));
387 _initial_young_size = NewSize;
388
389 // OldSize is already aligned because above we aligned MaxHeapSize to
390 // _heap_alignment, and we just made sure that NewSize is aligned to
391 // _gen_alignment. In initialize_flags() we verified that _heap_alignment
392 // is a multiple of _gen_alignment.
393 FLAG_SET_ERGO(size_t, OldSize, MaxHeapSize - NewSize);
394 } else {
395 FLAG_SET_ERGO(size_t, MaxHeapSize, align_size_up(NewSize + OldSize, _heap_alignment));
396 _max_heap_byte_size = MaxHeapSize;
397 }
398 }
399
400 // Update NewSize, if possible, to avoid sizing the young gen too small when only
401 // OldSize is set on the command line.
402 if (FLAG_IS_CMDLINE(OldSize) && !FLAG_IS_CMDLINE(NewSize)) {
403 if (OldSize < _initial_heap_byte_size) {
404 size_t new_size = _initial_heap_byte_size - OldSize;
405 // Need to compare against the flag value for max since _max_young_size
406 // might not have been set yet.
407 if (new_size >= _min_young_size && new_size <= MaxNewSize) {
408 FLAG_SET_ERGO(size_t, NewSize, new_size);
409 _initial_young_size = NewSize;
410 }
411 }
412 }
413
414 always_do_update_barrier = UseConcMarkSweepGC;
415
416 DEBUG_ONLY(GenCollectorPolicy::assert_flags();)
417 }
418
419 // Values set on the command line win over any ergonomically
420 // set command line parameters.
421 // Ergonomic choice of parameters are done before this
422 // method is called. Values for command line parameters such as NewSize
423 // and MaxNewSize feed those ergonomic choices into this method.
424 // This method makes the final generation sizings consistent with
425 // themselves and with overall heap sizings.
426 // In the absence of explicitly set command line flags, policies
427 // such as the use of NewRatio are used to size the generation.
428
429 // Minimum sizes of the generations may be different than
430 // the initial sizes. An inconsistency is permitted here
431 // in the total size that can be specified explicitly by
432 // command line specification of OldSize and NewSize and
433 // also a command line specification of -Xms. Issue a warning
434 // but allow the values to pass.
435 void GenCollectorPolicy::initialize_size_info() {
436 CollectorPolicy::initialize_size_info();
437
438 _initial_young_size = NewSize;
439 _max_young_size = MaxNewSize;
440 _initial_old_size = OldSize;
441
442 // Determine maximum size of the young generation.
443
444 if (FLAG_IS_DEFAULT(MaxNewSize)) {
445 _max_young_size = scale_by_NewRatio_aligned(_max_heap_byte_size);
446 // Bound the maximum size by NewSize below (since it historically
447 // would have been NewSize and because the NewRatio calculation could
448 // yield a size that is too small) and bound it by MaxNewSize above.
449 // Ergonomics plays here by previously calculating the desired
450 // NewSize and MaxNewSize.
451 _max_young_size = MIN2(MAX2(_max_young_size, _initial_young_size), MaxNewSize);
452 }
453
454 // Given the maximum young size, determine the initial and
455 // minimum young sizes.
456
457 if (_max_heap_byte_size == _initial_heap_byte_size) {
458 // The maximum and initial heap sizes are the same so the generation's
459 // initial size must be the same as it maximum size. Use NewSize as the
460 // size if set on command line.
461 _max_young_size = FLAG_IS_CMDLINE(NewSize) ? NewSize : _max_young_size;
462 _initial_young_size = _max_young_size;
463
464 // Also update the minimum size if min == initial == max.
465 if (_max_heap_byte_size == _min_heap_byte_size) {
466 _min_young_size = _max_young_size;
467 }
468 } else {
469 if (FLAG_IS_CMDLINE(NewSize)) {
470 // If NewSize is set on the command line, we should use it as
471 // the initial size, but make sure it is within the heap bounds.
472 _initial_young_size =
473 MIN2(_max_young_size, bound_minus_alignment(NewSize, _initial_heap_byte_size));
474 _min_young_size = bound_minus_alignment(_initial_young_size, _min_heap_byte_size);
475 } else {
476 // For the case where NewSize is not set on the command line, use
477 // NewRatio to size the initial generation size. Use the current
478 // NewSize as the floor, because if NewRatio is overly large, the resulting
479 // size can be too small.
480 _initial_young_size =
481 MIN2(_max_young_size, MAX2(scale_by_NewRatio_aligned(_initial_heap_byte_size), NewSize));
482 }
483 }
484
485 if (PrintGCDetails && Verbose) {
486 gclog_or_tty->print_cr("1: Minimum young " SIZE_FORMAT " Initial young "
487 SIZE_FORMAT " Maximum young " SIZE_FORMAT,
488 _min_young_size, _initial_young_size, _max_young_size);
489 }
490
491 // At this point the minimum, initial and maximum sizes
492 // of the overall heap and of the young generation have been determined.
493 // The maximum old size can be determined from the maximum young
494 // and maximum heap size since no explicit flags exist
495 // for setting the old generation maximum.
496 _max_old_size = MAX2(_max_heap_byte_size - _max_young_size, _gen_alignment);
497
498 // If no explicit command line flag has been set for the
499 // old generation size, use what is left.
500 if (!FLAG_IS_CMDLINE(OldSize)) {
501 // The user has not specified any value but the ergonomics
502 // may have chosen a value (which may or may not be consistent
503 // with the overall heap size). In either case make
504 // the minimum, maximum and initial sizes consistent
505 // with the young sizes and the overall heap sizes.
506 _min_old_size = _gen_alignment;
507 _initial_old_size = MIN2(_max_old_size, MAX2(_initial_heap_byte_size - _initial_young_size, _min_old_size));
508 // _max_old_size has already been made consistent above.
509 } else {
510 // OldSize has been explicitly set on the command line. Use it
511 // for the initial size but make sure the minimum allow a young
512 // generation to fit as well.
513 // If the user has explicitly set an OldSize that is inconsistent
514 // with other command line flags, issue a warning.
515 // The generation minimums and the overall heap minimum should
516 // be within one generation alignment.
517 if (_initial_old_size > _max_old_size) {
518 warning("Inconsistency between maximum heap size and maximum "
519 "generation sizes: using maximum heap = " SIZE_FORMAT
520 " -XX:OldSize flag is being ignored",
521 _max_heap_byte_size);
522 _initial_old_size = _max_old_size;
523 }
524
525 _min_old_size = MIN2(_initial_old_size, _min_heap_byte_size - _min_young_size);
526 }
527
528 // The initial generation sizes should match the initial heap size,
529 // if not issue a warning and resize the generations. This behavior
530 // differs from JDK8 where the generation sizes have higher priority
531 // than the initial heap size.
532 if ((_initial_old_size + _initial_young_size) != _initial_heap_byte_size) {
533 warning("Inconsistency between generation sizes and heap size, resizing "
534 "the generations to fit the heap.");
535
536 size_t desired_young_size = _initial_heap_byte_size - _initial_old_size;
537 if (_initial_heap_byte_size < _initial_old_size) {
538 // Old want all memory, use minimum for young and rest for old
539 _initial_young_size = _min_young_size;
540 _initial_old_size = _initial_heap_byte_size - _min_young_size;
541 } else if (desired_young_size > _max_young_size) {
542 // Need to increase both young and old generation
543 _initial_young_size = _max_young_size;
544 _initial_old_size = _initial_heap_byte_size - _max_young_size;
545 } else if (desired_young_size < _min_young_size) {
546 // Need to decrease both young and old generation
547 _initial_young_size = _min_young_size;
548 _initial_old_size = _initial_heap_byte_size - _min_young_size;
549 } else {
550 // The young generation boundaries allow us to only update the
551 // young generation.
552 _initial_young_size = desired_young_size;
553 }
554
555 if (PrintGCDetails && Verbose) {
556 gclog_or_tty->print_cr("2: Minimum young " SIZE_FORMAT " Initial young "
557 SIZE_FORMAT " Maximum young " SIZE_FORMAT,
558 _min_young_size, _initial_young_size, _max_young_size);
559 }
560 }
561
562 // Write back to flags if necessary.
563 if (NewSize != _initial_young_size) {
564 FLAG_SET_ERGO(size_t, NewSize, _initial_young_size);
565 }
566
567 if (MaxNewSize != _max_young_size) {
568 FLAG_SET_ERGO(size_t, MaxNewSize, _max_young_size);
569 }
570
571 if (OldSize != _initial_old_size) {
572 FLAG_SET_ERGO(size_t, OldSize, _initial_old_size);
573 }
574
575 if (PrintGCDetails && Verbose) {
576 gclog_or_tty->print_cr("Minimum old " SIZE_FORMAT " Initial old "
577 SIZE_FORMAT " Maximum old " SIZE_FORMAT,
578 _min_old_size, _initial_old_size, _max_old_size);
579 }
580
581 DEBUG_ONLY(GenCollectorPolicy::assert_size_info();)
582 }
583
584 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size,
585 bool is_tlab,
586 bool* gc_overhead_limit_was_exceeded) {
587 GenCollectedHeap *gch = GenCollectedHeap::heap();
588
589 debug_only(gch->check_for_valid_allocation_state());
590 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed");
591
592 // In general gc_overhead_limit_was_exceeded should be false so
593 // set it so here and reset it to true only if the gc time
594 // limit is being exceeded as checked below.
595 *gc_overhead_limit_was_exceeded = false;
596
597 HeapWord* result = NULL;
598
599 // Loop until the allocation is satisfied, or unsatisfied after GC.
600 for (uint try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) {
601 HandleMark hm; // Discard any handles allocated in each iteration.
602
603 // First allocation attempt is lock-free.
604 Generation *young = gch->young_gen();
605 assert(young->supports_inline_contig_alloc(),
606 "Otherwise, must do alloc within heap lock");
607 if (young->should_allocate(size, is_tlab)) {
608 result = young->par_allocate(size, is_tlab);
609 if (result != NULL) {
610 assert(gch->is_in_reserved(result), "result not in heap");
611 return result;
612 }
613 }
614 uint gc_count_before; // Read inside the Heap_lock locked region.
615 {
616 MutexLocker ml(Heap_lock);
617 if (PrintGC && Verbose) {
618 gclog_or_tty->print_cr("GenCollectorPolicy::mem_allocate_work:"
619 " attempting locked slow path allocation");
620 }
621 // Note that only large objects get a shot at being
622 // allocated in later generations.
623 bool first_only = ! should_try_older_generation_allocation(size);
624
625 result = gch->attempt_allocation(size, is_tlab, first_only);
626 if (result != NULL) {
627 assert(gch->is_in_reserved(result), "result not in heap");
628 return result;
629 }
630
631 if (GC_locker::is_active_and_needs_gc()) {
632 if (is_tlab) {
633 return NULL; // Caller will retry allocating individual object.
634 }
635 if (!gch->is_maximal_no_gc()) {
636 // Try and expand heap to satisfy request.
637 result = expand_heap_and_allocate(size, is_tlab);
638 // Result could be null if we are out of space.
639 if (result != NULL) {
640 return result;
641 }
642 }
643
644 if (gclocker_stalled_count > GCLockerRetryAllocationCount) {
645 return NULL; // We didn't get to do a GC and we didn't get any memory.
646 }
647
648 // If this thread is not in a jni critical section, we stall
649 // the requestor until the critical section has cleared and
650 // GC allowed. When the critical section clears, a GC is
651 // initiated by the last thread exiting the critical section; so
652 // we retry the allocation sequence from the beginning of the loop,
653 // rather than causing more, now probably unnecessary, GC attempts.
654 JavaThread* jthr = JavaThread::current();
655 if (!jthr->in_critical()) {
656 MutexUnlocker mul(Heap_lock);
657 // Wait for JNI critical section to be exited
658 GC_locker::stall_until_clear();
659 gclocker_stalled_count += 1;
660 continue;
661 } else {
662 if (CheckJNICalls) {
663 fatal("Possible deadlock due to allocating while"
664 " in jni critical section");
665 }
666 return NULL;
667 }
668 }
669
670 // Read the gc count while the heap lock is held.
671 gc_count_before = Universe::heap()->total_collections();
672 }
673
674 VM_GenCollectForAllocation op(size, is_tlab, gc_count_before);
675 VMThread::execute(&op);
676 if (op.prologue_succeeded()) {
677 result = op.result();
678 if (op.gc_locked()) {
679 assert(result == NULL, "must be NULL if gc_locked() is true");
680 continue; // Retry and/or stall as necessary.
681 }
682
683 // Allocation has failed and a collection
684 // has been done. If the gc time limit was exceeded the
685 // this time, return NULL so that an out-of-memory
686 // will be thrown. Clear gc_overhead_limit_exceeded
687 // so that the overhead exceeded does not persist.
688
689 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded();
690 const bool softrefs_clear = all_soft_refs_clear();
691
692 if (limit_exceeded && softrefs_clear) {
693 *gc_overhead_limit_was_exceeded = true;
694 size_policy()->set_gc_overhead_limit_exceeded(false);
695 if (op.result() != NULL) {
696 CollectedHeap::fill_with_object(op.result(), size);
697 }
698 return NULL;
699 }
700 assert(result == NULL || gch->is_in_reserved(result),
701 "result not in heap");
702 return result;
703 }
704
705 // Give a warning if we seem to be looping forever.
706 if ((QueuedAllocationWarningCount > 0) &&
707 (try_count % QueuedAllocationWarningCount == 0)) {
708 warning("GenCollectorPolicy::mem_allocate_work retries %d times \n\t"
709 " size=" SIZE_FORMAT " %s", try_count, size, is_tlab ? "(TLAB)" : "");
710 }
711 }
712 }
713
714 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size,
715 bool is_tlab) {
716 GenCollectedHeap *gch = GenCollectedHeap::heap();
717 HeapWord* result = NULL;
718 Generation *old = gch->old_gen();
719 if (old->should_allocate(size, is_tlab)) {
720 result = old->expand_and_allocate(size, is_tlab);
721 }
722 if (result == NULL) {
723 Generation *young = gch->young_gen();
724 if (young->should_allocate(size, is_tlab)) {
725 result = young->expand_and_allocate(size, is_tlab);
726 }
727 }
728 assert(result == NULL || gch->is_in_reserved(result), "result not in heap");
729 return result;
730 }
731
732 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size,
733 bool is_tlab) {
734 GenCollectedHeap *gch = GenCollectedHeap::heap();
735 GCCauseSetter x(gch, GCCause::_allocation_failure);
736 HeapWord* result = NULL;
737
738 assert(size != 0, "Precondition violated");
739 if (GC_locker::is_active_and_needs_gc()) {
740 // GC locker is active; instead of a collection we will attempt
741 // to expand the heap, if there's room for expansion.
742 if (!gch->is_maximal_no_gc()) {
743 result = expand_heap_and_allocate(size, is_tlab);
744 }
745 return result; // Could be null if we are out of space.
746 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) {
747 // Do an incremental collection.
748 gch->do_collection(false /* full */,
749 false /* clear_all_soft_refs */,
750 size /* size */,
751 is_tlab /* is_tlab */,
752 number_of_generations() - 1 /* max_level */);
753 } else {
754 if (Verbose && PrintGCDetails) {
755 gclog_or_tty->print(" :: Trying full because partial may fail :: ");
756 }
757 // Try a full collection; see delta for bug id 6266275
758 // for the original code and why this has been simplified
759 // with from-space allocation criteria modified and
760 // such allocation moved out of the safepoint path.
761 gch->do_collection(true /* full */,
762 false /* clear_all_soft_refs */,
763 size /* size */,
764 is_tlab /* is_tlab */,
765 number_of_generations() - 1 /* max_level */);
766 }
767
768 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/);
769
770 if (result != NULL) {
771 assert(gch->is_in_reserved(result), "result not in heap");
772 return result;
773 }
774
775 // OK, collection failed, try expansion.
776 result = expand_heap_and_allocate(size, is_tlab);
777 if (result != NULL) {
778 return result;
779 }
780
781 // If we reach this point, we're really out of memory. Try every trick
782 // we can to reclaim memory. Force collection of soft references. Force
783 // a complete compaction of the heap. Any additional methods for finding
784 // free memory should be here, especially if they are expensive. If this
785 // attempt fails, an OOM exception will be thrown.
786 {
787 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted
788
789 gch->do_collection(true /* full */,
790 true /* clear_all_soft_refs */,
791 size /* size */,
792 is_tlab /* is_tlab */,
793 number_of_generations() - 1 /* max_level */);
794 }
795
796 result = gch->attempt_allocation(size, is_tlab, false /* first_only */);
797 if (result != NULL) {
798 assert(gch->is_in_reserved(result), "result not in heap");
799 return result;
800 }
801
802 assert(!should_clear_all_soft_refs(),
803 "Flag should have been handled and cleared prior to this point");
804
805 // What else? We might try synchronous finalization later. If the total
806 // space available is large enough for the allocation, then a more
807 // complete compaction phase than we've tried so far might be
808 // appropriate.
809 return NULL;
810 }
811
812 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation(
813 ClassLoaderData* loader_data,
814 size_t word_size,
815 Metaspace::MetadataType mdtype) {
816 uint loop_count = 0;
817 uint gc_count = 0;
818 uint full_gc_count = 0;
819
820 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock");
821
822 do {
823 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
824 if (result != NULL) {
825 return result;
826 }
827
828 if (GC_locker::is_active_and_needs_gc()) {
829 // If the GC_locker is active, just expand and allocate.
830 // If that does not succeed, wait if this thread is not
831 // in a critical section itself.
832 result =
833 loader_data->metaspace_non_null()->expand_and_allocate(word_size,
834 mdtype);
835 if (result != NULL) {
836 return result;
837 }
838 JavaThread* jthr = JavaThread::current();
839 if (!jthr->in_critical()) {
840 // Wait for JNI critical section to be exited
841 GC_locker::stall_until_clear();
842 // The GC invoked by the last thread leaving the critical
843 // section will be a young collection and a full collection
844 // is (currently) needed for unloading classes so continue
845 // to the next iteration to get a full GC.
846 continue;
847 } else {
848 if (CheckJNICalls) {
849 fatal("Possible deadlock due to allocating while"
850 " in jni critical section");
851 }
852 return NULL;
853 }
854 }
855
856 { // Need lock to get self consistent gc_count's
857 MutexLocker ml(Heap_lock);
858 gc_count = Universe::heap()->total_collections();
859 full_gc_count = Universe::heap()->total_full_collections();
860 }
861
862 // Generate a VM operation
863 VM_CollectForMetadataAllocation op(loader_data,
864 word_size,
865 mdtype,
866 gc_count,
867 full_gc_count,
868 GCCause::_metadata_GC_threshold);
869 VMThread::execute(&op);
870
871 // If GC was locked out, try again. Check before checking success because the
872 // prologue could have succeeded and the GC still have been locked out.
873 if (op.gc_locked()) {
874 continue;
875 }
876
877 if (op.prologue_succeeded()) {
878 return op.result();
879 }
880 loop_count++;
881 if ((QueuedAllocationWarningCount > 0) &&
882 (loop_count % QueuedAllocationWarningCount == 0)) {
883 warning("satisfy_failed_metadata_allocation() retries %d times \n\t"
884 " size=" SIZE_FORMAT, loop_count, word_size);
885 }
886 } while (true); // Until a GC is done
887 }
888
889 // Return true if any of the following is true:
890 // . the allocation won't fit into the current young gen heap
891 // . gc locker is occupied (jni critical section)
892 // . heap memory is tight -- the most recent previous collection
893 // was a full collection because a partial collection (would
894 // have) failed and is likely to fail again
895 bool GenCollectorPolicy::should_try_older_generation_allocation(
896 size_t word_size) const {
897 GenCollectedHeap* gch = GenCollectedHeap::heap();
898 size_t young_capacity = gch->young_gen()->capacity_before_gc();
899 return (word_size > heap_word_size(young_capacity))
900 || GC_locker::is_active_and_needs_gc()
901 || gch->incremental_collection_failed();
902 }
903
904
905 //
906 // MarkSweepPolicy methods
907 //
908
909 void MarkSweepPolicy::initialize_alignments() {
910 _space_alignment = _gen_alignment = (size_t)Generation::GenGrain;
911 _heap_alignment = compute_heap_alignment();
912 }
913
914 void MarkSweepPolicy::initialize_generations() {
915 _generations = NEW_C_HEAP_ARRAY(GenerationSpecPtr, number_of_generations(), mtGC);
916 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_young_size, _max_young_size);
917 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_old_size, _max_old_size);
918 }
919
920 void MarkSweepPolicy::initialize_gc_policy_counters() {
921 // Initialize the policy counters - 2 collectors, 3 generations.
922 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3);
923 }
924
925 /////////////// Unit tests ///////////////
926
927 #ifndef PRODUCT
928 // Testing that the NewSize flag is handled correct is hard because it
929 // depends on so many other configurable variables. This test only tries to
930 // verify that there are some basic rules for NewSize honored by the policies.
931 class TestGenCollectorPolicy {
932 public:
933 static void test_new_size() {
934 size_t flag_value;
935
936 save_flags();
937
938 // If NewSize is set on the command line, it should be used
939 // for both min and initial young size if less than min heap.
940 flag_value = 20 * M;
941 set_basic_flag_values();
942 FLAG_SET_CMDLINE(size_t, NewSize, flag_value);
943 verify_young_min(flag_value);
944
945 set_basic_flag_values();
946 FLAG_SET_CMDLINE(size_t, NewSize, flag_value);
947 verify_young_initial(flag_value);
948
949 // If NewSize is set on command line, but is larger than the min
950 // heap size, it should only be used for initial young size.
951 flag_value = 80 * M;
952 set_basic_flag_values();
953 FLAG_SET_CMDLINE(size_t, NewSize, flag_value);
954 verify_young_initial(flag_value);
955
956 // If NewSize has been ergonomically set, the collector policy
957 // should use it for min but calculate the initial young size
958 // using NewRatio.
959 flag_value = 20 * M;
960 set_basic_flag_values();
961 FLAG_SET_ERGO(size_t, NewSize, flag_value);
962 verify_young_min(flag_value);
963
964 set_basic_flag_values();
965 FLAG_SET_ERGO(size_t, NewSize, flag_value);
966 verify_scaled_young_initial(InitialHeapSize);
967
968 restore_flags();
969 }
970
971 static void test_old_size() {
972 size_t flag_value;
973 size_t heap_alignment = CollectorPolicy::compute_heap_alignment();
974
975 save_flags();
976
977 // If OldSize is set on the command line, it should be used
978 // for both min and initial old size if less than min heap.
979 flag_value = 20 * M;
980 set_basic_flag_values();
981 FLAG_SET_CMDLINE(size_t, OldSize, flag_value);
982 verify_old_min(flag_value);
983
984 set_basic_flag_values();
985 FLAG_SET_CMDLINE(size_t, OldSize, flag_value);
986 // Calculate what we expect the flag to be.
987 size_t expected_old_initial = align_size_up(InitialHeapSize, heap_alignment) - MaxNewSize;
988 verify_old_initial(expected_old_initial);
989
990 // If MaxNewSize is large, the maximum OldSize will be less than
991 // what's requested on the command line and it should be reset
992 // ergonomically.
993 // We intentionally set MaxNewSize + OldSize > MaxHeapSize (see over_size).
994 flag_value = 30 * M;
995 set_basic_flag_values();
996 FLAG_SET_CMDLINE(size_t, OldSize, flag_value);
997 size_t over_size = 20*M;
998 size_t new_size_value = align_size_up(MaxHeapSize, heap_alignment) - flag_value + over_size;
999 FLAG_SET_CMDLINE(size_t, MaxNewSize, new_size_value);
1000 // Calculate what we expect the flag to be.
1001 expected_old_initial = align_size_up(MaxHeapSize, heap_alignment) - MaxNewSize;
1002 verify_old_initial(expected_old_initial);
1003 restore_flags();
1004 }
1005
1006 static void verify_young_min(size_t expected) {
1007 MarkSweepPolicy msp;
1008 msp.initialize_all();
1009
1010 assert(msp.min_young_size() <= expected, err_msg("%zu > %zu", msp.min_young_size(), expected));
1011 }
1012
1013 static void verify_young_initial(size_t expected) {
1014 MarkSweepPolicy msp;
1015 msp.initialize_all();
1016
1017 assert(msp.initial_young_size() == expected, err_msg("%zu != %zu", msp.initial_young_size(), expected));
1018 }
1019
1020 static void verify_scaled_young_initial(size_t initial_heap_size) {
1021 MarkSweepPolicy msp;
1022 msp.initialize_all();
1023
1024 if (InitialHeapSize > initial_heap_size) {
1025 // InitialHeapSize was adapted by msp.initialize_all, e.g. due to alignment
1026 // caused by 64K page size.
1027 initial_heap_size = InitialHeapSize;
1028 }
1029
1030 size_t expected = msp.scale_by_NewRatio_aligned(initial_heap_size);
1031 assert(msp.initial_young_size() == expected, err_msg("%zu != %zu", msp.initial_young_size(), expected));
1032 assert(FLAG_IS_ERGO(NewSize) && NewSize == expected,
1033 err_msg("NewSize should have been set ergonomically to %zu, but was %zu", expected, NewSize));
1034 }
1035
1036 static void verify_old_min(size_t expected) {
1037 MarkSweepPolicy msp;
1038 msp.initialize_all();
1039
1040 assert(msp.min_old_size() <= expected, err_msg("%zu > %zu", msp.min_old_size(), expected));
1041 }
1042
1043 static void verify_old_initial(size_t expected) {
1044 MarkSweepPolicy msp;
1045 msp.initialize_all();
1046
1047 assert(msp.initial_old_size() == expected, err_msg("%zu != %zu", msp.initial_old_size(), expected));
1048 }
1049
1050
1051 private:
1052 static size_t original_InitialHeapSize;
1053 static size_t original_MaxHeapSize;
1054 static size_t original_MaxNewSize;
1055 static size_t original_MinHeapDeltaBytes;
1056 static size_t original_NewSize;
1057 static size_t original_OldSize;
1058
1059 static void set_basic_flag_values() {
1060 FLAG_SET_ERGO(size_t, MaxHeapSize, 180 * M);
1061 FLAG_SET_ERGO(size_t, InitialHeapSize, 100 * M);
1062 FLAG_SET_ERGO(size_t, OldSize, 4 * M);
1063 FLAG_SET_ERGO(size_t, NewSize, 1 * M);
1064 FLAG_SET_ERGO(size_t, MaxNewSize, 80 * M);
1065 Arguments::set_min_heap_size(40 * M);
1066 }
1067
1068 static void save_flags() {
1069 original_InitialHeapSize = InitialHeapSize;
1070 original_MaxHeapSize = MaxHeapSize;
1071 original_MaxNewSize = MaxNewSize;
1072 original_MinHeapDeltaBytes = MinHeapDeltaBytes;
1073 original_NewSize = NewSize;
1074 original_OldSize = OldSize;
1075 }
1076
1077 static void restore_flags() {
1078 InitialHeapSize = original_InitialHeapSize;
1079 MaxHeapSize = original_MaxHeapSize;
1080 MaxNewSize = original_MaxNewSize;
1081 MinHeapDeltaBytes = original_MinHeapDeltaBytes;
1082 NewSize = original_NewSize;
1083 OldSize = original_OldSize;
1084 }
1085 };
1086
1087 size_t TestGenCollectorPolicy::original_InitialHeapSize = 0;
1088 size_t TestGenCollectorPolicy::original_MaxHeapSize = 0;
1089 size_t TestGenCollectorPolicy::original_MaxNewSize = 0;
1090 size_t TestGenCollectorPolicy::original_MinHeapDeltaBytes = 0;
1091 size_t TestGenCollectorPolicy::original_NewSize = 0;
1092 size_t TestGenCollectorPolicy::original_OldSize = 0;
1093
1094 void TestNewSize_test() {
1095 TestGenCollectorPolicy::test_new_size();
1096 }
1097
1098 void TestOldSize_test() {
1099 TestGenCollectorPolicy::test_old_size();
1100 }
1101
1102 #endif