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src/share/vm/gc_implementation/g1/vm_operations_g1.hpp@2d160770d2e5
src/share/vm/gc_implementation/g1/vm_operations_g1.hpp
Mon, 02 Aug 2010 12:51:43 -0700
- author
- johnc
- date
- Mon, 02 Aug 2010 12:51:43 -0700
- changeset 2060
- 2d160770d2e5
- parent 2011
- 4e5661ba9d98
- child 2314
- f95d63e2154a
- permissions
- -rw-r--r--
6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp
1 /*
2 * Copyright (c) 2001, 2009, 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
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 // VM_operations for the G1 collector.
26 // VM_GC_Operation:
27 // - VM_CGC_Operation
28 // - VM_G1CollectFull
29 // - VM_G1CollectForAllocation
30 // - VM_G1IncCollectionPause
31 // - VM_G1PopRegionCollectionPause
33 class VM_G1CollectFull: public VM_GC_Operation {
34 public:
35 VM_G1CollectFull(unsigned int gc_count_before,
36 unsigned int full_gc_count_before,
37 GCCause::Cause cause)
38 : VM_GC_Operation(gc_count_before, full_gc_count_before) {
39 _gc_cause = cause;
40 }
41 ~VM_G1CollectFull() {}
42 virtual VMOp_Type type() const { return VMOp_G1CollectFull; }
43 virtual void doit();
44 virtual const char* name() const {
45 return "full garbage-first collection";
46 }
47 };
49 class VM_G1CollectForAllocation: public VM_GC_Operation {
50 private:
51 HeapWord* _res;
52 size_t _size; // size of object to be allocated
53 public:
54 VM_G1CollectForAllocation(size_t size, int gc_count_before)
55 : VM_GC_Operation(gc_count_before) {
56 _size = size;
57 _res = NULL;
58 }
59 ~VM_G1CollectForAllocation() {}
60 virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; }
61 virtual void doit();
62 virtual const char* name() const {
63 return "garbage-first collection to satisfy allocation";
64 }
65 HeapWord* result() { return _res; }
66 };
68 class VM_G1IncCollectionPause: public VM_GC_Operation {
69 private:
70 bool _should_initiate_conc_mark;
71 double _target_pause_time_ms;
72 unsigned int _full_collections_completed_before;
73 public:
74 VM_G1IncCollectionPause(unsigned int gc_count_before,
75 bool should_initiate_conc_mark,
76 double target_pause_time_ms,
77 GCCause::Cause cause)
78 : VM_GC_Operation(gc_count_before),
79 _full_collections_completed_before(0),
80 _should_initiate_conc_mark(should_initiate_conc_mark),
81 _target_pause_time_ms(target_pause_time_ms) {
82 guarantee(target_pause_time_ms > 0.0,
83 err_msg("target_pause_time_ms = %1.6lf should be positive",
84 target_pause_time_ms));
86 _gc_cause = cause;
87 }
88 virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; }
89 virtual void doit();
90 virtual void doit_epilogue();
91 virtual const char* name() const {
92 return "garbage-first incremental collection pause";
93 }
94 };
96 // Concurrent GC stop-the-world operations such as initial and final mark;
97 // consider sharing these with CMS's counterparts.
98 class VM_CGC_Operation: public VM_Operation {
99 VoidClosure* _cl;
100 const char* _printGCMessage;
101 public:
102 VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) :
103 _cl(cl),
104 _printGCMessage(printGCMsg)
105 {}
107 ~VM_CGC_Operation() {}
109 virtual VMOp_Type type() const { return VMOp_CGC_Operation; }
110 virtual void doit();
111 virtual bool doit_prologue();
112 virtual void doit_epilogue();
113 virtual const char* name() const {
114 return "concurrent gc";
115 }
116 };
