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comparison src/share/vm/memory/tenuredGeneration.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 2001-2007 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 // TenuredGeneration models the heap containing old (promoted/tenured) objects.
26
27 class ParGCAllocBufferWithBOT;
28
29 class TenuredGeneration: public OneContigSpaceCardGeneration {
30 friend class VMStructs;
31 protected:
32 // current shrinking effect: this damps shrinking when the heap gets empty.
33 size_t _shrink_factor;
34 // Some statistics from before gc started.
35 // These are gathered in the gc_prologue (and should_collect)
36 // to control growing/shrinking policy in spite of promotions.
37 size_t _capacity_at_prologue;
38 size_t _used_at_prologue;
39
40 #ifndef SERIALGC
41 // To support parallel promotion: an array of parallel allocation
42 // buffers, one per thread, initially NULL.
43 ParGCAllocBufferWithBOT** _alloc_buffers;
44 #endif // SERIALGC
45
46 // Retire all alloc buffers before a full GC, so that they will be
47 // re-allocated at the start of the next young GC.
48 void retire_alloc_buffers_before_full_gc();
49
50 GenerationCounters* _gen_counters;
51 CSpaceCounters* _space_counters;
52
53 public:
54 TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
55 GenRemSet* remset);
56
57 Generation::Name kind() { return Generation::MarkSweepCompact; }
58
59 // Printing
60 const char* name() const;
61 const char* short_name() const { return "Tenured"; }
62 bool must_be_youngest() const { return false; }
63 bool must_be_oldest() const { return true; }
64
65 // Does a "full" (forced) collection invoked on this generation collect
66 // all younger generations as well? Note that this is a
67 // hack to allow the collection of the younger gen first if the flag is
68 // set. This is better than using th policy's should_collect_gen0_first()
69 // since that causes us to do an extra unnecessary pair of restart-&-stop-world.
70 virtual bool full_collects_younger_generations() const {
71 return !CollectGen0First;
72 }
73
74 // Mark sweep support
75 void compute_new_size();
76 int allowed_dead_ratio() const;
77
78 virtual void gc_prologue(bool full);
79 virtual void gc_epilogue(bool full);
80 bool should_collect(bool full,
81 size_t word_size,
82 bool is_tlab);
83
84 virtual void collect(bool full,
85 bool clear_all_soft_refs,
86 size_t size,
87 bool is_tlab);
88
89 #ifndef SERIALGC
90 // Overrides.
91 virtual oop par_promote(int thread_num,
92 oop obj, markOop m, size_t word_sz);
93 virtual void par_promote_alloc_undo(int thread_num,
94 HeapWord* obj, size_t word_sz);
95 virtual void par_promote_alloc_done(int thread_num);
96 #endif // SERIALGC
97
98 // Performance Counter support
99 void update_counters();
100
101 // Statistics
102
103 virtual void update_gc_stats(int level, bool full);
104
105 virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes,
106 bool younger_handles_promotion_failure) const;
107
108 void verify_alloc_buffers_clean();
109 };