Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 class PSMarkSweepDecorator; | |
26 | |
27 class PSOldGen : public CHeapObj { | |
28 friend class VMStructs; | |
29 friend class PSPromotionManager; // Uses the cas_allocate methods | |
30 friend class ParallelScavengeHeap; | |
31 friend class AdjoiningGenerations; | |
32 | |
33 protected: | |
34 MemRegion _reserved; // Used for simple containment tests | |
35 PSVirtualSpace* _virtual_space; // Controls mapping and unmapping of virtual mem | |
36 ObjectStartArray _start_array; // Keeps track of where objects start in a 512b block | |
37 MutableSpace* _object_space; // Where all the objects live | |
38 PSMarkSweepDecorator* _object_mark_sweep; // The mark sweep view of _object_space | |
39 const char* const _name; // Name of this generation. | |
40 | |
41 // Performance Counters | |
42 PSGenerationCounters* _gen_counters; | |
43 SpaceCounters* _space_counters; | |
44 | |
45 // Sizing information, in bytes, set in constructor | |
46 const size_t _init_gen_size; | |
47 const size_t _min_gen_size; | |
48 const size_t _max_gen_size; | |
49 | |
50 // Used when initializing the _name field. | |
51 static inline const char* select_name(); | |
52 | |
53 HeapWord* allocate_noexpand(size_t word_size, bool is_tlab) { | |
54 // We assume the heap lock is held here. | |
55 assert(!is_tlab, "Does not support TLAB allocation"); | |
56 assert_locked_or_safepoint(Heap_lock); | |
57 HeapWord* res = object_space()->allocate(word_size); | |
58 if (res != NULL) { | |
59 _start_array.allocate_block(res); | |
60 } | |
61 return res; | |
62 } | |
63 | |
64 // Support for MT garbage collection. CAS allocation is lower overhead than grabbing | |
65 // and releasing the heap lock, which is held during gc's anyway. This method is not | |
66 // safe for use at the same time as allocate_noexpand()! | |
67 HeapWord* cas_allocate_noexpand(size_t word_size) { | |
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68 assert(SafepointSynchronize::is_at_safepoint(), "Must only be called at safepoint"); |
0 | 69 HeapWord* res = object_space()->cas_allocate(word_size); |
70 if (res != NULL) { | |
71 _start_array.allocate_block(res); | |
72 } | |
73 return res; | |
74 } | |
75 | |
76 // Support for MT garbage collection. See above comment. | |
77 HeapWord* cas_allocate(size_t word_size) { | |
78 HeapWord* res = cas_allocate_noexpand(word_size); | |
79 return (res == NULL) ? expand_and_cas_allocate(word_size) : res; | |
80 } | |
81 | |
82 HeapWord* expand_and_allocate(size_t word_size, bool is_tlab); | |
83 HeapWord* expand_and_cas_allocate(size_t word_size); | |
84 void expand(size_t bytes); | |
85 bool expand_by(size_t bytes); | |
86 bool expand_to_reserved(); | |
87 | |
88 void shrink(size_t bytes); | |
89 | |
90 void post_resize(); | |
91 | |
92 public: | |
93 // Initialize the generation. | |
94 PSOldGen(ReservedSpace rs, size_t alignment, | |
95 size_t initial_size, size_t min_size, size_t max_size, | |
96 const char* perf_data_name, int level); | |
97 | |
98 PSOldGen(size_t initial_size, size_t min_size, size_t max_size, | |
99 const char* perf_data_name, int level); | |
100 | |
101 void initialize(ReservedSpace rs, size_t alignment, | |
102 const char* perf_data_name, int level); | |
103 void initialize_virtual_space(ReservedSpace rs, size_t alignment); | |
104 void initialize_work(const char* perf_data_name, int level); | |
105 | |
106 MemRegion reserved() const { return _reserved; } | |
107 virtual size_t max_gen_size() { return _max_gen_size; } | |
108 size_t min_gen_size() { return _min_gen_size; } | |
109 | |
110 // Returns limit on the maximum size of the generation. This | |
111 // is the same as _max_gen_size for PSOldGen but need not be | |
112 // for a derived class. | |
113 virtual size_t gen_size_limit(); | |
114 | |
115 bool is_in(const void* p) const { | |
116 return _virtual_space->contains((void *)p); | |
117 } | |
118 | |
119 bool is_in_reserved(const void* p) const { | |
120 return reserved().contains(p); | |
121 } | |
122 | |
123 MutableSpace* object_space() const { return _object_space; } | |
124 PSMarkSweepDecorator* object_mark_sweep() const { return _object_mark_sweep; } | |
125 ObjectStartArray* start_array() { return &_start_array; } | |
126 PSVirtualSpace* virtual_space() const { return _virtual_space;} | |
127 | |
128 // Has the generation been successfully allocated? | |
129 bool is_allocated(); | |
130 | |
131 // MarkSweep methods | |
132 virtual void precompact(); | |
133 void adjust_pointers(); | |
134 void compact(); | |
135 | |
136 // Parallel old | |
137 virtual void move_and_update(ParCompactionManager* cm); | |
138 | |
139 // Size info | |
140 size_t capacity_in_bytes() const { return object_space()->capacity_in_bytes(); } | |
141 size_t used_in_bytes() const { return object_space()->used_in_bytes(); } | |
142 size_t free_in_bytes() const { return object_space()->free_in_bytes(); } | |
143 | |
144 size_t capacity_in_words() const { return object_space()->capacity_in_words(); } | |
145 size_t used_in_words() const { return object_space()->used_in_words(); } | |
146 size_t free_in_words() const { return object_space()->free_in_words(); } | |
147 | |
148 // Includes uncommitted memory | |
149 size_t contiguous_available() const; | |
150 | |
151 bool is_maximal_no_gc() const { | |
152 return virtual_space()->uncommitted_size() == 0; | |
153 } | |
154 | |
155 // Calculating new sizes | |
156 void resize(size_t desired_free_space); | |
157 | |
158 // Allocation. We report all successful allocations to the size policy | |
159 // Note that the perm gen does not use this method, and should not! | |
160 HeapWord* allocate(size_t word_size, bool is_tlab); | |
161 | |
162 // Iteration. | |
163 void oop_iterate(OopClosure* cl) { object_space()->oop_iterate(cl); } | |
164 void object_iterate(ObjectClosure* cl) { object_space()->object_iterate(cl); } | |
165 | |
166 // Debugging - do not use for time critical operations | |
167 virtual void print() const; | |
168 virtual void print_on(outputStream* st) const; | |
169 void print_used_change(size_t prev_used) const; | |
170 | |
171 void verify(bool allow_dirty); | |
172 void verify_object_start_array(); | |
173 | |
174 // These should not used | |
175 virtual void reset_after_change(); | |
176 | |
177 // These should not used | |
178 virtual size_t available_for_expansion(); | |
179 virtual size_t available_for_contraction(); | |
180 | |
181 void space_invariants() PRODUCT_RETURN; | |
182 | |
183 // Performace Counter support | |
184 void update_counters(); | |
185 | |
186 // Printing support | |
187 virtual const char* name() const { return _name; } | |
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188 |
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189 // Debugging support |
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190 // Save the tops of all spaces for later use during mangling. |
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191 void record_spaces_top() PRODUCT_RETURN; |
0 | 192 }; |