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comparison src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class PSMarkSweepDecorator;
26
27 class PSYoungGen : public CHeapObj {
28 friend class VMStructs;
29 friend class ParallelScavengeHeap;
30 friend class AdjoiningGenerations;
31
32 protected:
33 MemRegion _reserved;
34 PSVirtualSpace* _virtual_space;
35
36 // Spaces
37 MutableSpace* _eden_space;
38 MutableSpace* _from_space;
39 MutableSpace* _to_space;
40
41
42 // MarkSweep Decorators
43 PSMarkSweepDecorator* _eden_mark_sweep;
44 PSMarkSweepDecorator* _from_mark_sweep;
45 PSMarkSweepDecorator* _to_mark_sweep;
46
47 // Sizing information, in bytes, set in constructor
48 const size_t _init_gen_size;
49 const size_t _min_gen_size;
50 const size_t _max_gen_size;
51
52 // Performance counters
53 PSGenerationCounters* _gen_counters;
54 SpaceCounters* _eden_counters;
55 SpaceCounters* _from_counters;
56 SpaceCounters* _to_counters;
57
58 // Initialize the space boundaries
59 void compute_initial_space_boundaries();
60
61 // Space boundary helper
62 void set_space_boundaries(size_t eden_size, size_t survivor_size);
63
64 virtual bool resize_generation(size_t eden_size, size_t survivor_size);
65 virtual void resize_spaces(size_t eden_size, size_t survivor_size);
66
67 // Adjust the spaces to be consistent with the virtual space.
68 void post_resize();
69
70 // Return number of bytes that the generation can change.
71 // These should not be used by PSYoungGen
72 virtual size_t available_for_expansion();
73 virtual size_t available_for_contraction();
74
75 // Given a desired shrinkage in the size of the young generation,
76 // return the actual size available for shrinkage.
77 virtual size_t limit_gen_shrink(size_t desired_change);
78 // returns the number of bytes available from the current size
79 // down to the minimum generation size.
80 size_t available_to_min_gen();
81 // Return the number of bytes available for shrinkage considering
82 // the location the live data in the generation.
83 virtual size_t available_to_live();
84
85 public:
86 // Initialize the generation.
87 PSYoungGen(size_t initial_byte_size,
88 size_t minimum_byte_size,
89 size_t maximum_byte_size);
90 void initialize_work();
91 virtual void initialize(ReservedSpace rs, size_t alignment);
92 virtual void initialize_virtual_space(ReservedSpace rs, size_t alignment);
93
94 MemRegion reserved() const { return _reserved; }
95
96 bool is_in(const void* p) const {
97 return _virtual_space->contains((void *)p);
98 }
99
100 bool is_in_reserved(const void* p) const {
101 return reserved().contains((void *)p);
102 }
103
104 MutableSpace* eden_space() const { return _eden_space; }
105 MutableSpace* from_space() const { return _from_space; }
106 MutableSpace* to_space() const { return _to_space; }
107 PSVirtualSpace* virtual_space() const { return _virtual_space; }
108
109 // For Adaptive size policy
110 size_t min_gen_size() { return _min_gen_size; }
111
112 // MarkSweep support
113 PSMarkSweepDecorator* eden_mark_sweep() const { return _eden_mark_sweep; }
114 PSMarkSweepDecorator* from_mark_sweep() const { return _from_mark_sweep; }
115 PSMarkSweepDecorator* to_mark_sweep() const { return _to_mark_sweep; }
116
117 void precompact();
118 void adjust_pointers();
119 void compact();
120
121 // Parallel Old
122 void move_and_update(ParCompactionManager* cm);
123
124 // Called during/after gc
125 void swap_spaces();
126
127 // Resize generation using suggested free space size and survivor size
128 // NOTE: "eden_size" and "survivor_size" are suggestions only. Current
129 // heap layout (particularly, live objects in from space) might
130 // not allow us to use these values.
131 void resize(size_t eden_size, size_t survivor_size);
132
133 // Size info
134 size_t capacity_in_bytes() const;
135 size_t used_in_bytes() const;
136 size_t free_in_bytes() const;
137
138 size_t capacity_in_words() const;
139 size_t used_in_words() const;
140 size_t free_in_words() const;
141
142 // The max this generation can grow to
143 size_t max_size() const { return _reserved.byte_size(); }
144
145 // The max this generation can grow to if the boundary between
146 // the generations are allowed to move.
147 size_t gen_size_limit() const { return _max_gen_size; }
148
149 bool is_maximal_no_gc() const {
150 return true; // never expands except at a GC
151 }
152
153 // Allocation
154 HeapWord* allocate(size_t word_size, bool is_tlab) {
155 HeapWord* result = eden_space()->cas_allocate(word_size);
156 return result;
157 }
158
159 HeapWord** top_addr() const { return eden_space()->top_addr(); }
160 HeapWord** end_addr() const { return eden_space()->end_addr(); }
161
162 // Iteration.
163 void oop_iterate(OopClosure* cl);
164 void object_iterate(ObjectClosure* cl);
165
166 virtual void reset_after_change();
167 virtual void reset_survivors_after_shrink();
168
169 // Performance Counter support
170 void update_counters();
171
172 // Debugging - do not use for time critical operations
173 void print() const;
174 void print_on(outputStream* st) const;
175 void print_used_change(size_t prev_used) const;
176 virtual const char* name() const { return "PSYoungGen"; }
177
178 void verify(bool allow_dirty);
179
180 // Space boundary invariant checker
181 void space_invariants() PRODUCT_RETURN;
182 };