Mercurial > hg > truffle
annotate src/share/vm/memory/tenuredGeneration.hpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
---|---|
date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | f95d63e2154a |
children | db9981fd3124 |
rev | line source |
---|---|
0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
470
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_TENUREDGENERATION_HPP |
26 #define SHARE_VM_MEMORY_TENUREDGENERATION_HPP | |
27 | |
28 #include "gc_implementation/shared/cSpaceCounters.hpp" | |
29 #include "gc_implementation/shared/gcStats.hpp" | |
30 #include "gc_implementation/shared/generationCounters.hpp" | |
31 #include "memory/generation.hpp" | |
32 | |
0 | 33 // TenuredGeneration models the heap containing old (promoted/tenured) objects. |
34 | |
35 class ParGCAllocBufferWithBOT; | |
36 | |
37 class TenuredGeneration: public OneContigSpaceCardGeneration { | |
38 friend class VMStructs; | |
39 protected: | |
40 // current shrinking effect: this damps shrinking when the heap gets empty. | |
41 size_t _shrink_factor; | |
42 // Some statistics from before gc started. | |
43 // These are gathered in the gc_prologue (and should_collect) | |
44 // to control growing/shrinking policy in spite of promotions. | |
45 size_t _capacity_at_prologue; | |
46 size_t _used_at_prologue; | |
47 | |
48 #ifndef SERIALGC | |
49 // To support parallel promotion: an array of parallel allocation | |
50 // buffers, one per thread, initially NULL. | |
51 ParGCAllocBufferWithBOT** _alloc_buffers; | |
52 #endif // SERIALGC | |
53 | |
54 // Retire all alloc buffers before a full GC, so that they will be | |
55 // re-allocated at the start of the next young GC. | |
56 void retire_alloc_buffers_before_full_gc(); | |
57 | |
58 GenerationCounters* _gen_counters; | |
59 CSpaceCounters* _space_counters; | |
60 | |
61 public: | |
62 TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level, | |
63 GenRemSet* remset); | |
64 | |
65 Generation::Name kind() { return Generation::MarkSweepCompact; } | |
66 | |
67 // Printing | |
68 const char* name() const; | |
69 const char* short_name() const { return "Tenured"; } | |
70 bool must_be_youngest() const { return false; } | |
71 bool must_be_oldest() const { return true; } | |
72 | |
73 // Does a "full" (forced) collection invoked on this generation collect | |
74 // all younger generations as well? Note that this is a | |
75 // hack to allow the collection of the younger gen first if the flag is | |
76 // set. This is better than using th policy's should_collect_gen0_first() | |
77 // since that causes us to do an extra unnecessary pair of restart-&-stop-world. | |
78 virtual bool full_collects_younger_generations() const { | |
79 return !CollectGen0First; | |
80 } | |
81 | |
82 // Mark sweep support | |
83 void compute_new_size(); | |
84 | |
85 virtual void gc_prologue(bool full); | |
86 virtual void gc_epilogue(bool full); | |
87 bool should_collect(bool full, | |
88 size_t word_size, | |
89 bool is_tlab); | |
90 | |
91 virtual void collect(bool full, | |
92 bool clear_all_soft_refs, | |
93 size_t size, | |
94 bool is_tlab); | |
95 | |
96 #ifndef SERIALGC | |
97 // Overrides. | |
98 virtual oop par_promote(int thread_num, | |
99 oop obj, markOop m, size_t word_sz); | |
100 virtual void par_promote_alloc_undo(int thread_num, | |
101 HeapWord* obj, size_t word_sz); | |
102 virtual void par_promote_alloc_done(int thread_num); | |
103 #endif // SERIALGC | |
104 | |
105 // Performance Counter support | |
106 void update_counters(); | |
107 | |
108 // Statistics | |
109 | |
110 virtual void update_gc_stats(int level, bool full); | |
111 | |
1888
a7214d79fcf1
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
ysr
parents:
1552
diff
changeset
|
112 virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const; |
0 | 113 |
114 void verify_alloc_buffers_clean(); | |
115 }; | |
1972 | 116 |
117 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP |