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comparison src/share/vm/gc_implementation/parNew/asParNewGeneration.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 2005-2006 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 // A Generation that does parallel young-gen collection extended
26 // for adaptive size policy.
27
28 // Division of generation into spaces
29 // done by DefNewGeneration::compute_space_boundaries()
30 // +---------------+
31 // | uncommitted |
32 // |---------------|
33 // | ss0 |
34 // |---------------|
35 // | ss1 |
36 // |---------------|
37 // | |
38 // | eden |
39 // | |
40 // +---------------+ <-- low end of VirtualSpace
41 //
42 class ASParNewGeneration: public ParNewGeneration {
43
44 size_t _min_gen_size;
45
46 // Resize the generation based on the desired sizes of
47 // the constituent spaces.
48 bool resize_generation(size_t eden_size, size_t survivor_size);
49 // Resize the spaces based on their desired sizes but
50 // respecting the maximum size of the generation.
51 void resize_spaces(size_t eden_size, size_t survivor_size);
52 // Return the byte size remaining to the minimum generation size.
53 size_t available_to_min_gen();
54 // Return the byte size remaining to the live data in the generation.
55 size_t available_to_live() const;
56 // Return the byte size that the generation is allowed to shrink.
57 size_t limit_gen_shrink(size_t bytes);
58 // Reset the size of the spaces after a shrink of the generation.
59 void reset_survivors_after_shrink();
60
61 // Accessor
62 VirtualSpace* virtual_space() { return &_virtual_space; }
63
64 virtual void adjust_desired_tenuring_threshold();
65
66 public:
67
68 ASParNewGeneration(ReservedSpace rs,
69 size_t initial_byte_size,
70 size_t min_byte_size,
71 int level);
72
73 virtual const char* short_name() const { return "ASParNew"; }
74 virtual const char* name() const;
75 virtual Generation::Name kind() { return ASParNew; }
76
77 // Change the sizes of eden and the survivor spaces in
78 // the generation. The parameters are desired sizes
79 // and are not guaranteed to be met. For example, if
80 // the total is larger than the generation.
81 void resize(size_t eden_size, size_t survivor_size);
82
83 virtual void compute_new_size();
84
85 size_t max_gen_size() { return _reserved.byte_size(); }
86 size_t min_gen_size() const { return _min_gen_size; }
87
88 // Space boundary invariant checker
89 void space_invariants() PRODUCT_RETURN;
90 };