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src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp@4dfb2df418f2
src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp
Thu, 22 Sep 2011 10:57:37 -0700
- author
- johnc
- date
- Thu, 22 Sep 2011 10:57:37 -0700
- changeset 3175
- 4dfb2df418f2
- parent 2314
- f95d63e2154a
- child 4037
- da91efe96a93
- permissions
- -rw-r--r--
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
1 /*
2 * Copyright (c) 2001, 2010, 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
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7 * published by the Free Software Foundation.
8 *
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12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP
28 #include "memory/collectorPolicy.hpp"
30 // There is a nice batch of tested generation sizing code in
31 // TwoGenerationCollectorPolicy. Lets reuse it!
33 class GenerationSizer : public TwoGenerationCollectorPolicy {
34 public:
35 GenerationSizer() {
36 // Partial init only!
37 initialize_flags();
38 initialize_size_info();
39 }
41 void initialize_flags() {
42 // Do basic sizing work
43 this->TwoGenerationCollectorPolicy::initialize_flags();
45 // If the user hasn't explicitly set the number of worker
46 // threads, set the count.
47 assert(UseSerialGC ||
48 !FLAG_IS_DEFAULT(ParallelGCThreads) ||
49 (ParallelGCThreads > 0),
50 "ParallelGCThreads should be set before flag initialization");
52 // The survivor ratio's are calculated "raw", unlike the
53 // default gc, which adds 2 to the ratio value. We need to
54 // make sure the values are valid before using them.
55 if (MinSurvivorRatio < 3) {
56 MinSurvivorRatio = 3;
57 }
59 if (InitialSurvivorRatio < 3) {
60 InitialSurvivorRatio = 3;
61 }
62 }
64 size_t min_young_gen_size() { return _min_gen0_size; }
65 size_t young_gen_size() { return _initial_gen0_size; }
66 size_t max_young_gen_size() { return _max_gen0_size; }
68 size_t min_old_gen_size() { return _min_gen1_size; }
69 size_t old_gen_size() { return _initial_gen1_size; }
70 size_t max_old_gen_size() { return _max_gen1_size; }
72 size_t perm_gen_size() { return PermSize; }
73 size_t max_perm_gen_size() { return MaxPermSize; }
74 };
76 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP
