author | xdono |
Wed, 02 Jul 2008 12:55:16 -0700 | |
changeset 670 | ddf3e9583f2f |
parent 186 | 32e6c95f8d9b |
child 1388 | 3677f5f3d66b |
permissions | -rw-r--r-- |
1 | 1 |
/* |
670 | 2 |
* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
1 | 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 |
// This class (or more correctly, subtypes of this class) |
|
26 |
// are used to define global garbage collector attributes. |
|
27 |
// This includes initialization of generations and any other |
|
28 |
// shared resources they may need. |
|
29 |
// |
|
30 |
// In general, all flag adjustment and validation should be |
|
31 |
// done in initialize_flags(), which is called prior to |
|
32 |
// initialize_size_info(). |
|
33 |
// |
|
34 |
// This class is not fully developed yet. As more collector(s) |
|
35 |
// are added, it is expected that we will come across further |
|
36 |
// behavior that requires global attention. The correct place |
|
37 |
// to deal with those issues is this class. |
|
38 |
||
39 |
// Forward declarations. |
|
40 |
class GenCollectorPolicy; |
|
41 |
class TwoGenerationCollectorPolicy; |
|
42 |
#ifndef SERIALGC |
|
43 |
class ConcurrentMarkSweepPolicy; |
|
44 |
#endif // SERIALGC |
|
45 |
class AdaptiveSizePolicy; |
|
46 |
class GCPolicyCounters; |
|
47 |
class PermanentGenerationSpec; |
|
48 |
class MarkSweepPolicy; |
|
49 |
||
50 |
class CollectorPolicy : public CHeapObj { |
|
51 |
protected: |
|
52 |
PermanentGenerationSpec *_permanent_generation; |
|
53 |
GCPolicyCounters* _gc_policy_counters; |
|
54 |
||
55 |
// Requires that the concrete subclass sets the alignment constraints |
|
56 |
// before calling. |
|
57 |
virtual void initialize_flags(); |
|
58 |
virtual void initialize_size_info() = 0; |
|
59 |
// Initialize "_permanent_generation" to a spec for the given kind of |
|
60 |
// Perm Gen. |
|
61 |
void initialize_perm_generation(PermGen::Name pgnm); |
|
62 |
||
63 |
size_t _initial_heap_byte_size; |
|
64 |
size_t _max_heap_byte_size; |
|
65 |
size_t _min_heap_byte_size; |
|
66 |
||
67 |
size_t _min_alignment; |
|
68 |
size_t _max_alignment; |
|
69 |
||
70 |
CollectorPolicy() : |
|
71 |
_min_alignment(1), |
|
72 |
_max_alignment(1), |
|
73 |
_initial_heap_byte_size(0), |
|
74 |
_max_heap_byte_size(0), |
|
75 |
_min_heap_byte_size(0) |
|
76 |
{} |
|
77 |
||
78 |
public: |
|
79 |
void set_min_alignment(size_t align) { _min_alignment = align; } |
|
80 |
size_t min_alignment() { return _min_alignment; } |
|
81 |
void set_max_alignment(size_t align) { _max_alignment = align; } |
|
82 |
size_t max_alignment() { return _max_alignment; } |
|
83 |
||
84 |
size_t initial_heap_byte_size() { return _initial_heap_byte_size; } |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
85 |
void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; } |
1 | 86 |
size_t max_heap_byte_size() { return _max_heap_byte_size; } |
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
87 |
void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; } |
1 | 88 |
size_t min_heap_byte_size() { return _min_heap_byte_size; } |
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
89 |
void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; } |
1 | 90 |
|
91 |
enum Name { |
|
92 |
CollectorPolicyKind, |
|
93 |
TwoGenerationCollectorPolicyKind, |
|
94 |
TrainPolicyKind, |
|
95 |
ConcurrentMarkSweepPolicyKind, |
|
96 |
ASConcurrentMarkSweepPolicyKind |
|
97 |
}; |
|
98 |
||
99 |
// Identification methods. |
|
100 |
virtual GenCollectorPolicy* as_generation_policy() { return NULL; } |
|
101 |
virtual TwoGenerationCollectorPolicy* as_two_generation_policy() { return NULL; } |
|
102 |
virtual MarkSweepPolicy* as_mark_sweep_policy() { return NULL; } |
|
103 |
#ifndef SERIALGC |
|
104 |
virtual ConcurrentMarkSweepPolicy* as_concurrent_mark_sweep_policy() { return NULL; } |
|
105 |
#endif // SERIALGC |
|
106 |
// Note that these are not virtual. |
|
107 |
bool is_generation_policy() { return as_generation_policy() != NULL; } |
|
108 |
bool is_two_generation_policy() { return as_two_generation_policy() != NULL; } |
|
109 |
bool is_mark_sweep_policy() { return as_mark_sweep_policy() != NULL; } |
|
110 |
#ifndef SERIALGC |
|
111 |
bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; } |
|
112 |
#else // SERIALGC |
|
113 |
bool is_concurrent_mark_sweep_policy() { return false; } |
|
114 |
#endif // SERIALGC |
|
115 |
||
116 |
virtual PermanentGenerationSpec *permanent_generation() { |
|
117 |
assert(_permanent_generation != NULL, "Sanity check"); |
|
118 |
return _permanent_generation; |
|
119 |
} |
|
120 |
||
121 |
virtual BarrierSet::Name barrier_set_name() = 0; |
|
122 |
virtual GenRemSet::Name rem_set_name() = 0; |
|
123 |
||
124 |
// Create the remembered set (to cover the given reserved region, |
|
125 |
// allowing breaking up into at most "max_covered_regions"). |
|
126 |
virtual GenRemSet* create_rem_set(MemRegion reserved, |
|
127 |
int max_covered_regions); |
|
128 |
||
129 |
// This method controls how a collector satisfies a request |
|
130 |
// for a block of memory. "gc_time_limit_was_exceeded" will |
|
131 |
// be set to true if the adaptive size policy determine that |
|
132 |
// an excessive amount of time is being spent doing collections |
|
133 |
// and caused a NULL to be returned. If a NULL is not returned, |
|
134 |
// "gc_time_limit_was_exceeded" has an undefined meaning. |
|
135 |
virtual HeapWord* mem_allocate_work(size_t size, |
|
136 |
bool is_tlab, |
|
137 |
bool* gc_overhead_limit_was_exceeded) = 0; |
|
138 |
||
139 |
// This method controls how a collector handles one or more |
|
140 |
// of its generations being fully allocated. |
|
141 |
virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0; |
|
142 |
// Performace Counter support |
|
143 |
GCPolicyCounters* counters() { return _gc_policy_counters; } |
|
144 |
||
145 |
// Create the jstat counters for the GC policy. By default, policy's |
|
146 |
// don't have associated counters, and we complain if this is invoked. |
|
147 |
virtual void initialize_gc_policy_counters() { |
|
148 |
ShouldNotReachHere(); |
|
149 |
} |
|
150 |
||
151 |
virtual CollectorPolicy::Name kind() { |
|
152 |
return CollectorPolicy::CollectorPolicyKind; |
|
153 |
} |
|
154 |
||
155 |
// Returns true if a collector has eden space with soft end. |
|
156 |
virtual bool has_soft_ended_eden() { |
|
157 |
return false; |
|
158 |
} |
|
159 |
||
160 |
}; |
|
161 |
||
162 |
class GenCollectorPolicy : public CollectorPolicy { |
|
163 |
protected: |
|
164 |
size_t _min_gen0_size; |
|
165 |
size_t _initial_gen0_size; |
|
166 |
size_t _max_gen0_size; |
|
167 |
||
168 |
GenerationSpec **_generations; |
|
169 |
||
170 |
// The sizing of the different generations in the heap are controlled |
|
171 |
// by a sizing policy. |
|
172 |
AdaptiveSizePolicy* _size_policy; |
|
173 |
||
174 |
// Return true if an allocation should be attempted in the older |
|
175 |
// generation if it fails in the younger generation. Return |
|
176 |
// false, otherwise. |
|
177 |
virtual bool should_try_older_generation_allocation(size_t word_size) const; |
|
178 |
||
179 |
void initialize_flags(); |
|
180 |
void initialize_size_info(); |
|
181 |
||
182 |
// Try to allocate space by expanding the heap. |
|
183 |
virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab); |
|
184 |
||
185 |
// compute max heap alignment |
|
186 |
size_t compute_max_alignment(); |
|
187 |
||
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
188 |
// Scale the base_size by NewRation according to |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
189 |
// result = base_size / (NewRatio + 1) |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
190 |
// and align by min_alignment() |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
191 |
size_t scale_by_NewRatio_aligned(size_t base_size); |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
192 |
|
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
193 |
// Bound the value by the given maximum minus the |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
194 |
// min_alignment. |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
195 |
size_t bound_minus_alignment(size_t desired_size, size_t maximum_size); |
1 | 196 |
|
197 |
public: |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
198 |
// Accessors |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
199 |
size_t min_gen0_size() { return _min_gen0_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
200 |
void set_min_gen0_size(size_t v) { _min_gen0_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
201 |
size_t initial_gen0_size() { return _initial_gen0_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
202 |
void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
203 |
size_t max_gen0_size() { return _max_gen0_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
204 |
void set_max_gen0_size(size_t v) { _max_gen0_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
205 |
|
1 | 206 |
virtual int number_of_generations() = 0; |
207 |
||
208 |
virtual GenerationSpec **generations() { |
|
209 |
assert(_generations != NULL, "Sanity check"); |
|
210 |
return _generations; |
|
211 |
} |
|
212 |
||
213 |
virtual GenCollectorPolicy* as_generation_policy() { return this; } |
|
214 |
||
215 |
virtual void initialize_generations() = 0; |
|
216 |
||
217 |
virtual void initialize_all() { |
|
218 |
initialize_flags(); |
|
219 |
initialize_size_info(); |
|
220 |
initialize_generations(); |
|
221 |
} |
|
222 |
||
223 |
HeapWord* mem_allocate_work(size_t size, |
|
224 |
bool is_tlab, |
|
225 |
bool* gc_overhead_limit_was_exceeded); |
|
226 |
||
227 |
HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab); |
|
228 |
||
229 |
// The size that defines a "large array". |
|
230 |
virtual size_t large_typearray_limit(); |
|
231 |
||
232 |
// Adaptive size policy |
|
233 |
AdaptiveSizePolicy* size_policy() { return _size_policy; } |
|
234 |
virtual void initialize_size_policy(size_t init_eden_size, |
|
235 |
size_t init_promo_size, |
|
236 |
size_t init_survivor_size); |
|
237 |
||
238 |
}; |
|
239 |
||
240 |
||
241 |
// All of hotspot's current collectors are subtypes of this |
|
242 |
// class. Currently, these collectors all use the same gen[0], |
|
243 |
// but have different gen[1] types. If we add another subtype |
|
244 |
// of CollectorPolicy, this class should be broken out into |
|
245 |
// its own file. |
|
246 |
||
247 |
class TwoGenerationCollectorPolicy : public GenCollectorPolicy { |
|
248 |
protected: |
|
249 |
size_t _min_gen1_size; |
|
250 |
size_t _initial_gen1_size; |
|
251 |
size_t _max_gen1_size; |
|
252 |
||
253 |
void initialize_flags(); |
|
254 |
void initialize_size_info(); |
|
255 |
void initialize_generations() { ShouldNotReachHere(); } |
|
256 |
||
257 |
public: |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
258 |
// Accessors |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
259 |
size_t min_gen1_size() { return _min_gen1_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
260 |
void set_min_gen1_size(size_t v) { _min_gen1_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
261 |
size_t initial_gen1_size() { return _initial_gen1_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
262 |
void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
263 |
size_t max_gen1_size() { return _max_gen1_size; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
264 |
void set_max_gen1_size(size_t v) { _max_gen1_size = v; } |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
265 |
|
1 | 266 |
// Inherited methods |
267 |
TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } |
|
268 |
||
269 |
int number_of_generations() { return 2; } |
|
270 |
BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } |
|
271 |
GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } |
|
272 |
||
273 |
virtual CollectorPolicy::Name kind() { |
|
274 |
return CollectorPolicy::TwoGenerationCollectorPolicyKind; |
|
275 |
} |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
276 |
|
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
277 |
// Returns true is gen0 sizes were adjusted |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
278 |
bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr, |
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
279 |
size_t heap_size, size_t min_gen1_size); |
1 | 280 |
}; |
281 |
||
282 |
class MarkSweepPolicy : public TwoGenerationCollectorPolicy { |
|
283 |
protected: |
|
284 |
void initialize_generations(); |
|
285 |
||
286 |
public: |
|
287 |
MarkSweepPolicy(); |
|
288 |
||
289 |
MarkSweepPolicy* as_mark_sweep_policy() { return this; } |
|
290 |
||
291 |
void initialize_gc_policy_counters(); |
|
292 |
}; |